Disclosed is a polyurethane resin-forming composition for a sealant for a hollow fiber membrane module, comprising a main agent (A) containing an isocyanate component and a curing agent (B) containing a polyol component, wherein as the isocyanate component constituting the main agent (A), an isocyanate group-terminated prepolymer which is obtained by reacting polymeric MDI (a1) which is a mixture of diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanate with an aliphatic alcohol (a2) having 10 to 15 carbon atoms and has an isocyanate group content of 15.0 to 21.5 % by mass is contained, and as the polyol component constituting the curing agent (B), at least one member (b1) selected from a group consisting of castor oil and castor oil-based modified polyols and a hydroxy group-containing amine-based compound (b2) are contained.
Disclosed is a polyurethane resin forming composition comprising a polyol (A), an isocyanate terminated prepolymer (B), a catalyst (C), and a reaction inhibitor (D), wherein: the polyol (A) is obtained by means of the transesterification of a polycarbonate polyol (a1), a polycaprolactone polyol (a2), and an aliphatic glycol (a3); the isocyanate terminated prepolymer (B) is obtained from the reaction between a poly(tetramethylene glycol) (b1) and an aliphatic organic diisocyanate (b2); the catalyst (C) is a dibutyl bis(2,4-pentanedionato) tin; the reaction inhibitor (D) is a 2,4-pentanedione; and the mass ratio of the catalyst in relation to the reaction inhibitor is 50 to 667 ((D)/(C)). The polyurethane resin forming composition has an excellent pot life and curing properties, and exhibits an excellent appearance, long-term stability, yellowing resistance, and wear resistance as a coating film.
Provided is a method for producing a water-based polyurethane emulsion, which simultaneously solves the problems of hydrolysis resistance and offensive odors that are inherent to water-based polyurethane emulsions. Also provided is an adhesive. The method for producing a water-based polyurethane emulsion entails neutralizing a urethane polymer with a first tertiary amine, and subsequently performing chain extension and water dispersion. The method also has a step in which a second tertiary amine having weaker basic properties than the first tertiary amine is added to the emulsion dispersed in water, and an alkali metal base is subsequently added.
C08G 18/00 - Polymeric products of isocyanates or isothiocyanates
C08J 3/05 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
Disclosed is a polyurethane resin-forming composition containing: an aromatic isocyanate-terminated pre-polymer (a1); one or more aliphatic organic polyisocyanate compounds (a2) chosen from a specified group; and an organic polyisocyanate composition for waterproofing (A) with an isocynanate group content and ratio number within a set range and an amine polyol (B) with a nominal average functionality of 3-6, wherein the ratio of isocyanate group to hydroxyl group thereof is within a specified range. Here, the pre-polymer (A1) is a reaction product of an aromatic polyisocyanate (a11) and a polyether polyol (a12), and the polyether polyol (a12) comprises a polyethyl polyol (a12-1) with a nominal average functionality of 2 and oxyethylene group content within a specified range, and a polyethyl polyol (a12-2) with a nominal average functionality of 3 and oxyethylene group content within a specified range.
Disclosed is an organic polyisocyanate composition (A) for a moisture-curable water-sealing material, wherein said composition contains an aromatic isocyanate-terminated prepolymer (a1) and an aliphatic organic polyisocyanate (a2), which is one or more compounds selected from a specific set, and in which the ratio and amount of isocyanate groups contained is within a prescribed range. The aforementioned prepolymer (a1) is the reaction product of aromatic polyisocyanates (a11) and polyether polyols (a12), wherein the aforementioned polyether polyols (a12) comprise polyether polyols (a12-1) with an amount of oxyethylene groups in a specific range and a nominal average functional base number of 2, and polyether polyols (a12-2) with an amount of oxyethylene groups in a specific range and a nominal average functional base number of 3.
POLYURETHANE-RESIN-FORMABLE COMPOSITION FOR FILM-SEALING MATERIAL, AND FILM-SEALING MATERIAL FOR MODULE USING HOLLOW OR FLAT-FILM-LIKE FIBROUS SEPARATION FILM COMPRISING THE FORMABLE COMPOSITION
Disclosed are: a polyurethane-resin-formable composition for a film-sealing material, which has excellent heat resistance; a polyurethane-resin-formable composition which can be used as a film-sealing material for a module, wherein the film-sealing material comprises the formable composition, can be used for fiber-bundling purposes in medical/industrial separation apparatuses, has desired hardness and elongation at the same time, has excellent compatibility, and comprises a hollow or flat-film-like fibrous separation film; and a film-sealing material for a hollow or flat-film-like fibrous separation film, which is produced using the formable composition. Specifically disclosed is a polyurethane-resin-formable composition for a film-sealing material, which comprises an isocyanate component (A) and a polyol component (B), wherein a specific polyol component is used as the polyol component (B).
Provided is a polyurethane resin forming composition which exhibits excellent curability, heat resistance, water-swelling/water-sealing properties, and easy handling properties when used as a water-swelling/water-sealing material. Also provided is a water-sealing material for steel sheet piles using said polyurethane resin forming composition. Said polyurethane resin forming composition is characterized in that a polyurethane resin is obtained by reacting, at a combination ratio of 2:1 to 8:1 (isocyanate group: hydroxyl group), a prepolymer (A) having isocyanate groups at both terminals, the content of the isocyanate group being 0.5 to 15 mass%, with an amine polyol (B) having a nominal average functionality of 3 to 6, wherein the prepolymer (A) having isocyanate groups at both terminals comprises an organic polyisocyanate (a1) and a polyether polyol (a2) containing 50 to 100 mass% of an oxyethylene group.
Provided is a durable, low-density soft polyurethane foam for use as a vehicle cushion or seat back, said soft polyurethane foam having strong mechanical properties. Also provided is a method for manufacturing said soft polyurethane foam. The provided soft polyurethane foam is manufactured by reacting and foaming a liquid mixture containing an organic polyisocyanate (A), a polyol (B), a chain extender (C), a catalyst (D), and a foaming agent (E). The core density of the provided soft polyurethane foam is between 25 kg/m³ and 35 kg/m³. The aforementioned organic polyisocyanate (A) contains, by mass, 70 - 90% of a diphenylmethane diisocyanate (A-1) and 10 - 30% of a polymethylene polyphenylene polyisocyanate (A-2). Said diphenylmethane diisocyanate (A-1) contains 50 - 100% of 2,4-diphenylmethane diisocyanate and 2,2-diphenylmethane diisocyanate.
Disclosed is a one-pack type polyisocynate composition which expands and hardens in an expanded state when heated. These properties are achieved due to the use of the following in said one-pack type thermally expandable/hardenable polyisocynate composition: (A) an isocyanurate-modified hexamethylene-diisocyanate, (B) a poly(oxyalkylene)ethermonool, (C) an acidic phosphate ester and (D) alkyl succinate sulfonate.
Provided is a seat cushion for vehicles which has excellent manufacturability and provides an excellent operating environment and eliminates the sensation of bottoming that is felt on thinned automotive seat cushion pads, and which gives a highly comfortable ride. Use is made of flexible polyurethane foam for automotive seat cushions which is obtained by mixing a diphenylmethane diisocyanate-based polyisocyanate (A) with a polyol ingredient (B) in the presence of a catalyst (C), a foam stabilizer (D), and a blowing agent (E) and injecting the mixture into a mold, and which is characterized in that the difference between the density of the core of the foam and the overall density of the foam is 5 kg/m3 or less.
A method for decomposing polymethylene-polyphenylene polyisocyanate (polymeric MDI)-derived polyurea compounds is provided, in which a reutilizable polymethylene polyphenyl polyamine (PMDA) can be recovered from a polyurea residue which generates as a by-product when polymeric MDI is produced and which has been inevitably discarded so far, without adding a hydrolysis accelerator such as an alkali. The method does not arouse a problem concerning reactor corrosion. The method for decomposing polymeric MDI-derived polyurea compounds is characterized in that the polymeric MDI-derived polyurea compounds are hydrolyzed in supercritical or subcritical carbon dioxide.
C08J 11/16 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with inorganic material
Disclosed is a one-part primer composition for plastic coating, which has excellent adhesion to plastic materials (particularly nylon), excellent wet heat resistance and excellent storage stability. The primer composition for plastic coating comprises a polyurethane resin containing a carboxyl group, wherein the polyurethane resin is produced by reacting a high-molecular-weight polyol (A) having an Mn value of 500 to 5,000 and comprising a castor oil-type polyol (A1) containing an alkyl group in a side chain thereof, a low-molecular-weight polyol (B) having a molecular weight of less than 500 and comprising a diol (B1) containing a carboxyl group, and an organic polyisocyanate (C) with one another.
A primer composition which contains a urethane-urea resin obtained by reacting (A) an organic polyisocyanate with (B) a polymer polyol and (C) a chain extender consisting of a low -molecular diamine, wherein the urethane-urea resin exhibits a yield stress of 5.0MPa or above in the tensile test stipulated in JIS K6301 at a pulling rate of 200mm/min, and a tan δ value of 0.05 to 0.10 at 20°C in the dynamic viscoelasticity test stipulated in JIS K7244 at a temperature rise rate of 2°C/min, and has a number-average molecular weight of 10,000 to 30,000. The primer composition exhibits sufficient adhesiveness to adherends of plastics such as nylon, and can form a coating film with excellent solvent resistance even when the curing time is short.
C09D 175/00 - Coating compositions based on polyureas or polyurethanesCoating compositions based on derivatives of such polymers
B05D 3/10 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
B05D 5/00 - Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
C09D 5/00 - Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects producedFilling pastes
14.
MATERIAL SET OF FORMING POLYURETHANE RESIN COATING FILM FORMED ON SUBSTRATE
Provided is a material set of a polyurethane resin coating film with excellent film strength formed on a substrate. The material set comprises both a polyol component prepared by reacting a polycarbonate polyol with polycaprolactone polyol and an isocyanato-terminated prepolymer prepared by reacting polytetramethylene glycol with a polyisocyanate, wherein the mass ratio of the polycarbonate polyol to the polycaprolactone polyol is 65/35 or higher. Further, the polyol component may additionally contain both an organometallic curing catalyst which takes the form of fine powder at ordinary temperatures, and a cure retarder.
Provided is a method for the decomposition of tolylene diisocyanate (TDI)-based polyurea compounds, by which reusable tolylenediamine (TDA) can be recovered from a residue containing TDI-based polyurea compounds without adding a hydrolysis accelerator such as alkali thereto, said residue being a residue which is formed as a by-product in producing TDI and which has hitherto helplessly been disposed of. The method overcomes the problem of corrosion of a reactor. A method for the decomposition of TDI-based polyurea compounds, characterized by hydrolyzing TDI-based polyurea compounds in supercritical or subcritical carbon dioxide.
C07C 209/62 - Preparation of compounds containing amino groups bound to a carbon skeleton by cleaving carbon-to-nitrogen, sulfur-to-nitrogen, or phosphorus-to-nitrogen bonds, e.g. hydrolysis of amides, N-dealkylation of amines or quaternary ammonium compounds
B01J 3/00 - Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matterApparatus therefor
C07C 211/50 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring having at least two amino groups bound to the carbon skeleton with at least two amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
C08J 11/16 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with inorganic material
Disclosed is a primer composition comprising (A) a polyfunctional urethane-urea resin that is obtained by reacting (A1) an organic polyisocyanate, (A2) a polymer polyol, and (A3) a chain extender made of a hydroxyl group-containing diamine, and that has hydroxyl groups derived from the aforementioned chain extender on molecule side chains, 5‑20 functional groups and a number average molecular weight of 10,000‑50,000, and (B) an organic solvent. The primer composition exhibits sufficient adhesion to an adherend made of a plastic, such as nylon, and a coating film with excellent solvent resistance can be formed even when the curing time is short.
A method for producing a methylene-crosslinked polyphenyl polyisocyanate, wherein sufficient hue improvement can be achieved while suppressing the amount of hydrogen chloride used therein. The method for producing a methylene-crosslinked polyphenyl polyisocyanate is characterized by comprising: a phosgenation step wherein a polymethylene polyphenyl polyamine and phosgene are reacted in the presence of an inert solvent; a solvent removal step wherein the inert solvent is removed from the reaction liquid obtained in the phosgenation step until the concentration of the solvent becomes 5-35% by mass; and a hydrogen chloride introduction step wherein hydrogen chloride is introduced into the reaction liquid after the solvent removal step. The method is also characterized in that the temperature of the reaction liquid is kept within the range of 60-130˚C in the phosgenation step, the solvent removal step and the hydrogen chloride introduction step. As a result, sufficient hue improvement can be achieved, while suppressing the amount of hydrogen chloride used therein.
Disclosed is a curing agent for two-package polyurethane resin coating materials, which can effectively improve the problem of deterioration in solvent resistance. Also disclosed are a method for producing the curing agent for two-package polyurethane resin coating materials, and a two-package polyurethane resin coating material. The curing agent for two-package polyurethane resin coating materials contains, as a main component, a modified polyisocyanate which is obtained by modifying a polyisocyanate with a modifying agent which has a functional group that exerts a catalytic action in a reaction with a base material containing a hydroxyl group and an active hydrogen. Preferably, the polyisocyanate includes one or both of an isocyanurate group and an allophanate group, or is composed of an aliphatic polyisocyanate or an alicyclic polyisocyanate. The modifying agent is composed of an organic non-metal compound, and the base material is composed of an acrylic resin. The two-package polyurethane resin coating material is composed of a curing agent for two-package resin coating materials and a base material containing an active hydrogen.
C08G 18/62 - Polymers of compounds having carbon-to-carbon double bonds
C08G 18/72 - Polyisocyanates or polyisothiocyanates
C09D 133/00 - Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereofCoating compositions based on derivatives of such polymers
19.
EXPANDABLE POWDERY THERMOPLASTIC POLYURETHANE RESIN COMPOSITION, NON-EXPANDABLE POWDERY THERMOPLASTIC POLYURETHANE RESIN COMPOSITION, AND SHEET-LIKE POLYURETHANE RESIN MOLDED ARTICLE AND METHOD FOR PRODUCTION THEREOF
Disclosed is an expandable powdery thermoplastic polyurethane resin composition (A) comprising a powdery thermoplastic polyurethane resin (A1) and a thermal-decomposition-type powdery foaming agent (A2) compounded in the powdery thermoplastic polyurethane resin (A1). The powdery thermoplastic polyurethane resin (A1) has a volume average particle diameter of 110 to 300 μm. In the powdery thermoplastic polyurethane resin (A1), the content of particles having particle diameters of less than 100 μm is 40 mass% or less, the content of particles having particle diameters of less than 30 μm is 5 mass% or less, and the content of particles having particle diameters of less than 20 μm is 2 mass% or less. The thermal-decomposition-type powdery foaming agent (A2) has a volume average particle diameter of 20 μm or less.
C08J 9/06 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
B32B 5/18 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer containing foamed or specifically porous material
Disclosed is an aqueous polyurethane dispersion having excellent dispersibility and productivity (specifically, a polyurethane dispersion, reactions of which can be easily controlled, and which can be supplied to the market with a stable quality). The aqueous polyurethane dispersion can provide a resin which has toughness and flexibility at the same time. Also disclosed is a method for producing the dispersion. The aqueous polyurethane dispersion uses a diphenylmethane diisocyanate, which contains 2,4'-diphenylmethane diisocyanate at a ratio not less than a specific ratio, and an alicyclic diisocyanate at a ratio within a specific range.
C08G 18/72 - Polyisocyanates or polyisothiocyanates
C08G 18/12 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
C08G 18/65 - Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
21.
POLYISOCYANATE COMPOSITION AND TWO-LIQUID TYPE PAINT COMPOSITION UTILIZING SAME
Disclosed are a polyisocyanate composition that is obtained by means of a urethanization reaction between a base polyisocyanate and a polyether polyol, wherein the base polyisocyanate contains allophanate groups and isocyanurate groups such that allophanate groups/isocyanurate groups = 80/20 to 30/70 (mol ratio), and a two-liquid type paint composition that utilizes the polyisocyanate composition. Thus a polyisocyanate composition that is soluble in low-polarity organic solvents, highly compatible with polyol compounds and capable of producing films with excellent solvent resistance and extensibility, and a two-liquid type paint composition that utilizes the polyisocyanate composition, can be provided.
Provided is a material for noise-proofing and vibration-proofing in an automobile engine chamber, being primarily an automobile cushioning material and automobile cover, comprising a soft polyurethane foam that has both excellent heat resistance and flame retardancy. A soft polyurethane foam is manufactured from (A) an isocyanate based on a diphenyl methane diisocyanate wherein the average number of NCO groups is 2.1-2.5, (B) a polymer polyol, (C) a catalyst, (D) a foam stabilizer, (E) a foaming agent, and (F) a castor oil-based polyol.
A flexible polyurethane foam with superior water resistance and alkali-resistance, with very good compressive residual strain. A polyurethane foam is obtained by causing a polyol component (A) and a diphenylmethane diisocyanate-based polyisocyanate (B) to react in the presence of a catalyst (C), antifoaming agent (D), foaming agent (E), and cross-linking agent (F), wherein the polyol component (A) contains 10 to 50% by mass relative to the polyol component (A) of a castor oil-based polyol (a1) that is a plant-derived starting material.
Provided is a method for degrading hexamethylene diisocyanate (HDI) polyurea that can recover re-usable hexamethylene diamine (HDA) without adding a hydrolysis accelerator such as alkali to a urea residue that is a by-product of HDI manufacture and has hitherto been discarded only, and does not cause corrosion problems on a reaction device. A method for degrading an HDI polyurea compound is characterized in that an HDI polyurea compound is hydrolyzed in super-critical or sub-critical carbon dioxide.
C07C 209/62 - Preparation of compounds containing amino groups bound to a carbon skeleton by cleaving carbon-to-nitrogen, sulfur-to-nitrogen, or phosphorus-to-nitrogen bonds, e.g. hydrolysis of amides, N-dealkylation of amines or quaternary ammonium compounds
B01J 3/00 - Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matterApparatus therefor
C08J 11/16 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with inorganic material
25.
METHOD FOR PRETREATMENT FOR PRODUCTION OF ISOCYANATE MIXTURE
Disclosed is a method for pretreatment for the production of an isocyanate mixture. In the method, the following treatment is carried out before the production of an isocyanate mixture (G) by a process comprising a reaction step of reacting an amine mixture (E) with phosgene (F) to synthesize an isocyanate mixture, a concentration step of concentrating the reaction step liquid containing the isocyanate mixture. In the pretreatment, an acidic material (C) and pretreatment media (A) and (B) are introduced into a production process system. The mixture is circulated within at least one of the reaction step system and the concentration step system and is then discharged to the outside of the production process system. The pretreatment method is useful for the production of an isocyanate mixture in which the amount of metals including iron mixed therein, which affects the reactivity of the isocyanate mixture is small.
Disclosed is a process for producing an isocyanate mixture (C). The process comprises a reaction step of introducing an amine mixture (A), phosgene (B), and an inert solvent into a reaction tank (10) and reacting the amine mixture (A) with phosgene (B) to synthesize an isocyanate mixture, and a concentration step of concentrating a liquid, which is produced in the reaction step and comprises the isocyanate mixture, the inert solvent, and acidic compounds such as by-produced hydrogen chloride and excess phosgene, in a concentration tank (20) to remove the inert solvent and the acidic compounds by evaporation from the liquid produced in the reaction step. In the reaction step, the reaction is carried out under reflux of the inert solvent. In the concentration step, at least a part of the inert solvent removed by the evaporation is again returned into the concentration tank (20). At least one of the inert solvent to be refluxed and the inert solvent to be again returned into the concentration tank (20) is treated with an adsorbent (13A) or an adsorbent (23A) before the introduction of the inert solvents into the respective tanks (10, 20). The process can produce an isocyanate mixture having a reduced content of a metal that affects the reactivity of the isocyanate mixture.
Disclosed is a urethane elastomer filler which comprises (A) an organic polyisocyanate, (B) a polyol mainly composed of a polyether polyol (b1) having an average number of functional groups of 2 to 4 and a number average molecular weight of 1000 or less, and (C) an aromatic hydrocarbon plasticizer mainly composed of an aromatic hydrocarbon (c1), wherein the content of the aromatic hydrocarbon plasticizer (C) is 10 to 100 parts by mass relative to 100 parts by mass of the organic polyisocyanate (A).
Provided is a manufacturing method for methylene cross-linked polyphenyl polyisocyanates with good hue-improving effects. The manufacturing method for methylene cross-linked polyphenyl polyisocyanates is provided with a phosgenation reaction process wherein polymethylene polyphenyl polyamine and phosgene are reacted at 50°C to 100°C, and a removal process wherein residual phosgene is removed at 50°C to 100°C from the reaction solution obtained in the phosgenation process. Good hue-improving effects are thereby obtained without the introduction of hydrogen chloride to the reaction solution.
Disclosed is a method for producing a polyisocyanate, which comprises: a polyamination step wherein an aromatic polyamine represented by general formula (I) is obtained by polyamination in an acidic ionic liquid using aniline and an aldehyde compound selected from formaldehyde and paraformaldehydes as raw materials; a phosgenation step wherein a phosgenated reaction product containing a first isocyanate is obtained by phosgenation of the aromatic polyamine and phosgene; and a mixing step wherein a polyisocyanate is obtained by mixing a hydrogen chloride-containing isocyanate, which contains a second isocyanate and hydrogen chloride, with the phosgenated reaction product. (In formula (I), q represents 0 or an integer of not less than 1.)
Disclosed is a method for producing a polyisocyanate, which can sufficiently improve hue of a polyisocyanate, while reducing the amount of hydrogen chloride used therein. The method for producing a polyisocyanate comprises a phosgenation step of reacting a polyamine with phosgene, a mixing step of mixing the reaction liquid obtained in the phosgenation step with a separately prepared isocyanate containing hydrogen chloride, and a heating step of heating the reaction liquid obtained in the mixing step. Consequently, the hue can be sufficiently improved with use of a small amount of hydrogen chloride without consuming an excessive amount of hydrogen chloride.
Disclosed is a method for producing an aromatic polyamine represented by general formula (II) by a reaction between an aldehyde compound and an amine represented by general formula (I). In the production method, an acidic group-containing ionic liquid is used as a catalyst or solvent for the reaction. In the formulae, A1 and A2 each represents an organic group or the like, and q represents a number of 0-5.
C07C 209/78 - Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton from carbonyl compounds, e.g. from formaldehyde, and amines having amino groups bound to carbon atoms of six-membered aromatic rings, with formation of methylene-diarylamines
C07C 211/50 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring having at least two amino groups bound to the carbon skeleton with at least two amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
Disclosed is a method for producing an aromatic polyamine represented by general formula (II) by a reaction between an aldehyde compound and an amine represented by general formula (I). In the production method, an acid catalyst is used as a catalyst for the reaction and an ionic liquid is used as a solvent for the reaction. In the formulae, A1 and A2 each represents an organic group or the like, and q represents a number of 0-5.
C07C 209/78 - Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton from carbonyl compounds, e.g. from formaldehyde, and amines having amino groups bound to carbon atoms of six-membered aromatic rings, with formation of methylene-diarylamines
C07C 211/50 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring having at least two amino groups bound to the carbon skeleton with at least two amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
Disclosed is a one-pack-type primer for a porous base, which comprises an aqueous polyurethane dispersion, wherein the aqueous polyurethane dispersion is prepared by using an MDI containing 75 mass% or more of 2,4'-diphenylmethanediisocyanate as a diisocyanate component. Also disclosed is a two-pack-type primer for a porous base, which comprises the above-mentioned aqueous polyurethane dispersion and a self-emulsifying-type allophanate-modified polyisocyanate curing agent. The primers contain no organic solvent, and are therefore safe in composition. The primers can be applied to a wide variety of base materials including inorganic base materials and organic base materials. The primers can form a primer layer having excellent mechanical strength, and can contribute to the maintenance of a coating appearance.
Provided is a method for breaking down polyurea without adding a hydrolysis promoter such as alkali to the by-product urea residue obtained when producing isocyanate, material which has only been treated as waste in the past. Reusable polyamine can be recovered and there is no problem with corrosion of the reaction apparatus. The urea compound is broken down by hydrolysis in carbon dioxide in the super-critical state or the sub-critical state. The pressure during hydrolysis is preferably from 5 to 10 MPa and the water/reaction vessel volume ratio is preferably from 10/100 to 30/100.
C08J 11/14 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with steam or water
B01J 3/00 - Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matterApparatus therefor
35.
POLYISOCYANATE COMPOSITION AND TWO-PACKAGE TYPE COATING COMPOSITION USING THE SAME
Disclosed is a polyisocyanate composition containing a polyisocyanate, which is obtained by reacting hexamethylene diisocyanate and an aliphatic monoalcohol having 11-20 carbon atoms, and a low-polarity organic solvent having an aniline point of 10-70˚C or a low-polarity organic solvent having a mixed aniline point of 5-50˚C. The polyisocyanate contains an allophanate group, an isocyanurate group and a urethane group in a molecule, and the molar ratio between the allophanate group and the isocyanurate group, namely allophanate group/isocyanurate group, is from 70/30 to 30/70. The composition is soluble in a low-polarity organic solvent, and has excellent compatibility with a polyol compound. Consequently, the composition can provide a coating film having excellent physical properties such as surface hardness.
Disclosed is a method for producing a polycarbonate polyol, which enables production of a polycarbonate polyol having a higher molecular weight than conventional ones through a process at a lower vacuum than conventional methods. The method for producing a polycarbonate polyol comprises a first step wherein a reaction is performed substantially at normal pressure using a dialkyl carbonate and a polycarbonate polyol having a number average molecular weight of 1,500-3,500 as starting materials, and the dialkyl carbonate is substantially consumed while removing a by-product alcohol by distillation; and a second step wherein a polycarbonate polyol having a number average molecular weight of 4,000-10,000 is obtained by reacting a reaction product of the first step at a reduced pressure of not less than 5 mmHg.
C08G 64/30 - General preparatory processes using carbonates
37.
THERMOPLASTIC POLYURETHANE RESIN COMPOSITION FOR PLATED DUAL MOLDING, DUAL-MOLDED ARTICLE FOR PLATING, PLATED DUAL-MOLDED ARTICLE, AND THEIR PRODUCTION METHODS
Disclosed is a thermoplastic polyurethane resin composition for plated dual molding, which comprises (A) an organic diisocyanate, (B) a polymer polyol mainly composed of (b1) a polybutadiene polyol containing a 1,2-vinyl structure and having 2.0 or less (on average) of functional groups contained therein, and (C) a chain-elongating agent mainly composed of (c1) an aliphatic diol having 2 to 10 carbon atoms.
C08G 18/65 - Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
B29C 45/14 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
C23C 18/16 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coatingContact plating by reduction or substitution, i.e. electroless plating
C25D 5/56 - Electroplating of non-metallic surfaces of plastics
B29K 75/00 - Use of polyureas or polyurethanes as moulding material
38.
THERMOPLASTIC POLYURETHANE RESIN COMPOSITION FOR PLATED DUAL MOLDING, DUAL-MOLDED ARTICLE FOR PLATING, PLATED DUAL-MOLDED ARTICLE, AND THEIR PRODUCTION METHODS
Disclosed is a thermoplastic polyurethane resin composition for plated dual molding, which comprises (A) an organic diisocyanate mainly composed of (a1) hexamethylene diisocyanate, (B) a polymer polyol mainly composed of (b1) polycarbonate diol, and (C) a chain-elongating agent mainly composed of (c1) an aliphatic diol having 2 to 10 carbon atoms.
C08G 18/65 - Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
B29C 45/14 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
C23C 18/16 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coatingContact plating by reduction or substitution, i.e. electroless plating
C25D 5/56 - Electroplating of non-metallic surfaces of plastics
B29K 75/00 - Use of polyureas or polyurethanes as moulding material
39.
PROCESS FOR PRODUCING THERMOPLASTIC POLYESTER ELASTOMER AND POLYCARBONATE OLIGOMER COMPOSITION AS STARTING MATERIAL FOR THE THERMOPLASTIC POLYESTER ELASTOMER
Disclosed is a production process that can cost effectively produce a thermoplastic polyester elastomer which can simultaneously realize excellent heat resistance, thermal aging resistance, water resistance, light stability, low-temperature properties and other properties, has excellent block property retention in molding, has excellent extrudability, and is less likely to cause drawdown during blow molding, i.e., has excellent moldability. Also disclosed is a polycarbonate oligomer composition as a starting material for the thermoplastic polyester elastomer. The production process is a process for producing a thermoplastic polyester elastomer comprising a hard segment and a soft segment bonded to each other, the hard segment being formed of a polyester comprising an aromatic dicarboxylic acid and an aliphatic or alicyclic diol, the soft segment being composed mainly of an aliphatic polycarbonate. In the production process, a polycarbonate oligomer having a terminal alkyl carbonate group or terminal aryl carbonate group in which the proportion of the terminal group is not less than 10% is provided as a starting material, and the polycarbonate oligomer and the polyester hard segment are subjected to a transesterification reaction to obtain the thermoplastic polyester elastomer.
The objective is to provide an aqueous polyurethane dispersing element with excellent dispersion properties as well as excellent producibility (concretely, where control of the reaction is easy and the polyurethane dispersing element obtained also has consistent quality and can be supplied to the market) and wherein diphenylmethane diisocyanate is used as the organic diisocyanate, and a method for manufacturing said dispersing element. The problem above is solved by using diphenylmethane diisocyanate configured from three kinds of isomers, namely, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,2'-diphenylmethane diisocyanate, which comprises 2,4'-diphenylmethane diisocyanate above a specified proportion.
Disclosed is a polyisocyanate which is produced by the reaction between a fluorinated monoalcohol and an aliphatic diisocyanate and comprises a modified allophanate and a modified isocyanulate. In the polyisocyanate, the modified allophanate comprises a monoallophanate, a diallophanate and a triallophanate, wherein the content of the diallophanate and the content of the triallophanate are 21 to 80 parts by mass and 5 to 60 parts by mass, respectively, relative to 100 parts by mass of the monoallophanate.
EMULSION COMPOSITION CONTAINING BLOCKED ISOCYANATE, PROCESS FOR PRODUCING THE SAME, WATER-BASED PRIMER FOR POROUS SUBSTRATE, AND WATER-BASED BAKING COATING COMPOSITION
A polyurethane emulsion for use in water-based one-pack type polyurethane resin coating materials employing a blocked isocyanate compound is improved to further improve the coating film performance of coating materials of the emulsion. This emulsion is used also as a primer. An emulsion composition containing a blocked isocyanate is provided which is produced by: reacting polymeric MDI (a1) with a high-molecular polyol (a2) containing a nonionic polar group; blocking the isocyanate groups with a blocking agent (C) to produce a blocked polyisocyanate ingredient (A); reacting an organic polyisocyanate (b1) with a high-molecular polyol (b2) and a carboxylated anionic low-molecular glycol (b3) in the resultant reaction system to produce a carboxylated isocyanate-terminated urethane prepolymer (B); neutralizing the carboxy groups with a neutralizing agent (D); thereafter emulsifying the reaction mixture in water; and then using a chain extender (E) to conduct a chain extension reaction and thereby yield a highly crosslinked polyurethane resin.
C08G 18/12 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
C08G 18/65 - Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
C09D 5/00 - Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects producedFilling pastes
Disclosed is a polyisocyanate composition obtained by urethanizing a base polyisocyanate and a polyether polyol, wherein the base polyisocyanate contains allophanate groups and isocyanurate groups at the following ratio (molar ratio): allophanate groups/isocyanurate groups = 90/10-100/0. The composition is soluble in low polar organic solvents and has excellent compatibility with polyol compounds. The composition enables formation of a coating film having excellent extensibility.
Disclosed is a polyurethane film with an excellent balance of strength and flexibility that has an environmentally friendly manufacturing process, and a manufacturing method of the same. The polyurethane film is obtained through a reaction between a polyol (A) and a polyisocyanate (B) using a catalyst (C), and characterized in that neither the polyol (A) nor the polyisocyanate (B) contain an organic solvent, wherein: the polyol (A) is a PCD which can be obtained from 1, 6-HD and a low molecular weight carbonate; and the polyisocyanate (B) is formed from a modified HDI polyisocyanate (B1) with a number average molecular weight of 350 to 500 and an average functional group number (f) that satisfies 2≤fឬ3, and an isocyanurate-modified HDI polyisocyanate (B2) that satisfies f≥3; and where (B1):(B2) = 50:50 to 95:5 (mass ratio).
Disclosed is a method for producing a polyisocyanate, which comprises a contact step wherein a reaction liquid obtained by reacting a polyamine with phosgene is brought into contact with a zeolite at 60-230˚C, and a heating step wherein the reaction liquid, which has been brought into contact with a zeolite in the contact step, is heated at 180-230˚C.
Provided is a process for producing a water-resistant flexible polyurethane foam having high water resistance. A polyol mixture including a low-molecular polyol having five or more OH groups on the average in an amount of 0.5 mass% or larger is reacted with a polyisocyanate having 2.1-2.5 NCO groups on the average. The low-molecular polyol has a number-average molecular weight of 600-1,500. The low-molecular polyol is a polyol obtained by causing either or both of propylene oxide and ethylene oxide to undergo addition reaction with a sugar alcohol having five or more OH groups. The remaining polyol of the polyol mixture is a polyether polyol. The polyether polyol has 1.7-4.5 OH groups on the average and a number-average molecular weight of 2,000-8,000.
C08J 9/04 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent
47.
SKIN-MATERIAL-FORMING COMPOSITION FOR FIBROUS LAYERED PRODUCT, SYNTHETIC LEATHER OR ARTIFICIAL LEATHER MADE WITH THE SAME, AND PROCESS FOR PRODUCING SYNTHETIC LEATHER OR ARTIFICIAL LEATHER
A skin-material-forming composition for fibrous layered products is provided which has an excellent balance between strength and flexibility and is friendly to the environment for production. Also provided is a synthetic leather made using the composition. The skin-material-forming composition for fibrous layered products is constituted of a main ingredient (A) and a hardener (B), and is characterized in that the main ingredient (A) is a PCD obtained from 1,6-HD and a low-molecular carbonate and that the hardener (B) comprises an HDI-modified polyisocyanate (B1) which has a number-average molecular weight of 350-500 and in which the average number of functional groups (f) satisfies 2≤f<3 and an HDI-isocyanurate-modified polyisocyanate (B2) satisfying f≥3, the (B1)/(B2) proportion being from 50/50 to 95/5 (by mass). The composition is further characterized in that neither the main ingredient (A) nor the hardener (B) contains an organic solvent.
C08G 18/72 - Polyisocyanates or polyisothiocyanates
D06N 3/14 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds with polyurethanes
Disclosed is a low-resilience flexible polyurethane foam which is composed of a flexible polyurethane foam obtained by reacting and foaming a mixed liquid containing (A) an organic polyisocyanate, (B) a polyol, (C) a chain extender, (D) a catalyst and (E) a foaming agent. The flexible polyurethane foam has a density within the range of 65-95 kg/m3, and the organic polyisocyanate (A) contains, per 100% by mass of the organic polyisocyanate (A), 52.5-62.5% by mass of diphenylmethane diisocyanate, 16.5-38.5% by mass of polymethylene polyphenylene polyisocyanate, and 9.0-21.0% by mass of carbodiimide-modified diphenylmethane diisocyanate.
C08G 18/72 - Polyisocyanates or polyisothiocyanates
C08J 9/12 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
[PROBLEMS] To provide a process for producing a hard polyurethane foam for a thick heat-insulating material, which has an excellent curing property, which can be release-molded within a short period, and which is expanded with cyclopentane. [MEANS FOR SOLVING PROBLEMS] Disclosed is a process for producing a hard polyurethane foam for a thick heat-insulating material, which comprises reacting/expanding a polyisocyanate (A) and a polyol (B) in the presence of a catalyst (C) and a foaming agent (D), wherein the polyisocyanate (A) comprises a prepolymer (A1) having an isocyanate group therein and produced by reacting a polymeric MDI (A1-1) with a low-molecular-weight polyol (A1-2) having a side chain alkyl group therein and a foam-controlling agent (A2), wherein the polyol (B) comprises four types of polyether polyols (B1) to (B4), wherein the catalyst (C) comprises an urethane-forming catalyst (C1) and a trimerizing catalyst (C2), and wherein the foaming agent (D) comprises cyclopentane (D1) and water (D2).
C08J 9/12 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
An auto-emulsifying type isocyanate compound where an organic polyisocyanate compound has been reacted with an imidazolium salt represented by general formula (1). In general formula (1), R1 signifies a hydrocarbyl group of carbon number 4 to 12 or the like, R2 signifies a hydrocarbyl group of carbon number 1 to 12 or the like, R3 signifies a hydrocarbyl group of carbon number 1 to 18 which is substituted with a hydroxyl group, or the like, R4 and R5 signify a hydrogen atom, hydrocarbyl group of carbon number 1 to 18 or the like, and X- signifies Cl-, Br- or the like. However, at least one of R2 and R3 must have a hydroxyl group.
A reactive isocyanate emulsifying agent comprising an imidazolium salt represented by general formula (1). In formula (1), R1 signifies a hydrocarbyl group of carbon number 4 to 12 or the like, R2 signifies a hydrocarbyl group of carbon number 1 to 12 or the like, R3 signifies a hydrocarbyl group of carbon number 1 to 18 which is substituted with a hydroxyl group, or the like, R4 and R5 signify a hydrogen atom, hydrocarbyl group of carbon number 1 to 18 or the like, and X- signifies Cl-, Br- or the like. However, at least one of R2 and R3 must have a hydroxyl group.
C07D 233/60 - Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms with hydrocarbon radicals, substituted by oxygen or sulfur atoms, attached to ring nitrogen atoms
C07D 233/64 - Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms, e.g. histidine
52.
POWDERY THERMOPLASTIC POLYURETHANE RESIN COMPOSITION, SHEET-LIKE POLYURETHANE RESIN MOLDED PRODUCT HAVING TWO-LAYER STRUCTURE USING THE POWDERY THERMOPLASTIC POLYURETHANE RESIN COMPOSITION, AND PROCESS FOR PRODUCING THE SHEET-LIKE POLYURETHANE RESIN MOLDED PRODUCT
Disclosed is a powdery thermoplastic polyurethane resin composition that can provide a sheet-like molded product, having a two-layer structure comprising a foamed layer and a non-foamed layer, which is soft to the touch, possesses excellent abrasion resistance, mechanical properties and other properties, and can realize a reduced weight and a lowered cost of molded products. Also disclosed are a sheet-like polyurethane resin molded product having a two-layer structure using the powdery thermoplastic polyurethane resin composition and a process for producing the sheet-like polyurethane resin molded product. The polyurethane resin composition (A) is produced by compounding a powdery thermoplastic polyurethane resin (A1) having an average particle diameter of 100 to 350 μm with a powdery thermally decomposable foaming agent (A2) having an average particle diameter of not more than 20 μm in an amount of 0.2 to 1.0% by mass based on the powdery thermoplastic polyurethane resin (A1). The sheet-like polyurethane resin molded product having a two-layer structure uses the powdery thermoplastic polyurethane resin composition (A) and a foaming agent-free powdery thermoplastic polyurethane resin composition (B).
C08J 9/06 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
B29C 41/18 - Slush casting, i.e. pouring moulding material into a hollow mould with excess material being poured off
[PROBLEMS] To provide a hard polyurethane foam which has good physical properties and a high oxygen index (30 or greater), and which meets the requirements of the standards for semi-non-combustible materials. [MEANS FOR SOLVING PROBLEMS] Disclosed is a process for producing a hard polyurethane foam, which comprises: subjecting an organic polyisocyanate (A) and water (B) to the urea-forming reaction and the isocyanurate-forming reaction in the presence of a flame-retardant agent (C) in an amount of 10 to 70 mass% relative to the total amount of the blend components, a foam-controlling agent (D) and a catalyst (E) comprising an isocyanurate-forming reaction catalyst, and in the presence or absence of a polyol in an amount of 5 mol% or less relative to the total amount of isocyanate reactive groups, under such conditions that the isocyanate index becomes 150 or greater as calculated by defining the isocyanate reactivity equivalence of water as 9, thereby expanding and curing the blended product.
[PROBLEMS] To provide a reaction-curable polyurethane resin composition which is extremely excellent in liquid storage stability (both homogeneity and reactivity) and in reactivity (uniformity of reaction) and a solventless, two-pack, reaction-curable polyurethane adhesive composed of “a base resin” and “a curing agent” which are based on the constituents of the composition. [MEANS FOR SOLVING PROBLEMS] The above problems can be solved by selecting and using a specific catalyst, by selecting and using a polymeric MDI having an acidity above a specific level as the organic polyisocyanate, and by specifying the equivalent ratio of isocyanato of the organic polyisocyanate to hydroxyl of castor oil polyol (A).
Disclosed is a two-component fluorine-containing coating composition, which is composed of a base material containing a fluorine-containing polyol and a curing agent containing a polyisocyanate. The base material and/or the curing agent contains an organic solvent having an aniline point of not more than 70˚C or an organic solvent having a mixed aniline point of 5-50˚C. The fluorine-containing polyol is soluble in the organic solvents, and the polyisocyanate contains an aliphatic polyisocyanate which is obtained by reacting an aliphatic diisocyanate with a monoalcohol having 1-20 carbon atoms. The molar ratio between allophanate groups and isocyanurate groups in the polyisocyanate is within the range from 100:0 to 90:10.
Disclosed is a polyurethane binding material composition, which is improved in productivity, while maintaining formability. Specifically disclosed is a polyurethane binding material composition using a curing agent which contains, as a polyol component, a castor oil fatty acid (b1) and castor oil and/or a castor oil-modified polyol (b2), while using, as an isocyanate component, a base material composed of diphenylmethane diisocyanate and/or a modified carbodiimide-containing diphenylmethane diisocyanate.
[PROBLEMS] To provide: an aqueous acryl-urethane block copolymer emulsion, which has a good film-forming property and good water dispersibility; a process for producing the emulsion; and an aqueous coating material. [MEANS FOR SOLVING PROBLEMS] Disclosed is an aqueous acryl-urethane block copolymer emulsion, which has an acryl block having no hydrophilic group and an urethane block through which the acryl block is crosslinked, wherein the urethane block has a nonionic hydrophilic pendant group and an anionic hydrophilic pendant group in its side chains, and wherein the nonionic hydrophilic group and the anionic hydrophilic group are contained in the resin in amounts of 2 to 8 mass% and 0.1 to 0.5 mmol/g, respectively.
C09D 155/00 - Coating composition based on homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups
58.
AQUEOUS RESIN COMPOSITION COMPRISING BLOCK-ISOCYANATE-CONTAINING AQUEOUS EMULSION COMPOSITION AS CURING AGENT, AND COMPOSITION FOR AQUEOUS BAKING COATING OR ADHESIVE AGENT WHICH UTILIZES THE SAME
Disclosed is a one-pack type aqueous resin composition containing a block isocyanate compound, which comprises the main component (I) and a curing agent (II) mentioned below. The aqueous resin composition is improved in dispersibility in water and storage stability, and can produce a coating film exhibiting various improved coating film properties at a temperature around the dissociation temperature of the block component and having improved weather resistance. The main component (I): an acrylic resin. The curing agent (II): an aqueous emulsion composition containing a block isocyanate, which is produced by the following steps: reacting an organic polyisocyanate (a1) with a high-molecular-weight polyol having a nonionic polar group (a2), and blocking the isocyanate group with a blocking agent (C), thereby producing a block polyisocyanate component (A); reacting an organic polyisocyanate (b1) with a high-molecular-weight polyol (b2) and a carboxyl-containing anionic low-molecular-weight glycol (b3) in the reaction system to produce a carboxyl-containing, isocyanate-terminated urethane prepolymer (B); neutralizing the carboxyl group in the reaction system with a neutralizing agent (D); emulsifying the reaction mixture in water; and carrying out the chain extension reaction with a chain-extending agent (E) to produce a highly crosslinked polyurethane resin.
C09D 133/00 - Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereofCoating compositions based on derivatives of such polymers
C09J 133/00 - Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereofAdhesives based on derivatives of such polymers
Disclosed is a curing agent composition for coating materials, which contains a polyisocyanate, a tetraalkoxysilane or a condensation product thereof, and an acid halide.
B05D 3/00 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
B05D 7/24 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
C08G 18/06 - Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
[PROBLEMS] To provide polyisocyanates for use in producing a rigid polyurethane foam having an excellent balance between bondability and dimensional stability and a process for producing the rigid polyurethane foam. [MEANS FOR SOLVING PROBLEMS] The polyisocyanates for use in producing a rigid polyurethane foam comprise 85-99.7 parts by mass of a polymeric diphenylmethane diisocyanate and 0.3-15 parts by mass of either or both of at least one aliphatic isocyanate and at least one alicyclic isocyanate. Preferably, the polyisocyanates are used in combination with water as a blowing agent. The either or both of at least one aliphatic isocyanate and at least one alicyclic isocyanate preferably are either or both of hexamethylene diisocyanate and a modification thereof. The polyisocyanates preferably have a viscosity at 25°C of 200 mPa s or lower.
COMPOSITION FOR FORMATION OF WATER-EXPANDED RIGID POLYISOCYANURATE FOAM, METHOD FOR PRODUCTION OF WATER-EXPANDED RIGID POLYISOCYANURATE FOAM USING THE COMPOSITION, AND WATER-EXPANDED RIGID POLYISOCYANURATE FOAM PRODUCED BY THE METHOD
To provide: a composition for forming a rigid polyisocyanurate foam having excellent flame retardancy and excellent mechanical properties by using water alone as a foaming agent; a method for producing a water-expanded rigid polyisocyanurate foam by using the composition; and a water-expanded rigid polyisocyanurate foam produced by the method. Disclosed is a composition for forming a water-expanded rigid polyisocyanurate foam having an isocyanate index of 350 or greater, which is characterized by using an organic polyisocyanate comprising MDI and a MDI-type polynuclear condensate and having a specific average number of functional groups and a polyol comprising a polyether polyol.
[PROBLEMS] In producing a hollow-fiber membrane module from hollow polysulfone fibers, use of a conventional polyurethane resin gives a wavy sealing part. A resin which is effective in merely inhibiting the waving has too high a hardness or arouses a trouble that the resin wets the hollow-fiber membranes over a longer length. [MEANS FOR SOLVING PROBLEMS] An isocyanate-terminated prepolymer having a urethane group concentration of 0.43-0.65 mmol/g and modified with a castor-oil-derived polyol having a hydroxyl value of 45-90 KOH-mg/g and a castor oil hardener are used for sealing. Thus, a hollow-fiber membrane module can be obtained in which the sealing resin has a hardness in a proper range, is reduced in wetting length, and is inhibited from waving.
[PROBLEMS] To provide: a polyurethane laminate which is free of the concerns about bleeding, has good follow-up properties and hermeticity due to its low hardness, and has reduced surface adhesion and good reusability and workability; and a sealing material and a damping/buffering material each utilizing the polyurethane laminate. [MEANS FOR SOLVING PROBLEMS] Disclosed are: a polyurethane laminate which comprises a polyurethane resin and a protective layer formed by applying a mixture of silyl isocyanate and a silicone polyol on the surface of the polyurethane resin at a ratio of 0.1 to 5 g/m2 and curing the applied mixture, which has an Asker C hardness of 30 or less at room temperature, and which has a 180-degree peel adhesion force against a PET film of 0.1 N/10 mm or less; and a sealing material and a damping/buffering material each utilizing the polyurethane laminate.
Disclosed is an organic polyisocyanate composition comprising: an isocyanate-terminated prepolymer (A1) produced by reacting an organic polyisocyanate (a1), a hydrophilic polyol (a2) and at least one member selected from the group consisting of a hydrophobic monool (a31) and a hydrophobic diol (a32); and a diluent (B1) having at least one group selected from the group consisting of a linear alkyl group and a linear alkylene group each having 4 or more carbon atoms.
Disclosed is a modified polyisocyanate composition having low viscosity and long pot life, which is excellent in weather resistance and tolerance to organic solvents with low polarity, while securing excellent curability, dryability and contamination resistance. Also disclosed is a two-component polyurethane coating composition using such a modified polyisocyanate composition. Specifically disclosed is a modified polyisocyanate composition having a viscosity of not more than 2000 mPa•s (25˚C), which is characterized by containing the components (A) and (B) described below. Also specifically disclosed is a two-component polyurethane coating composition using such a modified polyisocyanate composition. (A) a modified aliphatic polyisocyanate obtained from an aliphatic diisocyanate and a monool having 3-20 carbon atoms, which has an allophanate group/isocyanurate group ratio (molar ratio) of from 100/0 to 90/10 (B) a modified alicyclic polyisocyanate having an allophanate group/isocyanurate group ratio (molar ratio) of from 0/100 to 5/95
[PROBLEMS] To provide a soft polyurethane foam having a favorable storage stability and being simultaneously favorable in rebound resilience and mechanical properties. [MEANS FOR SOLVING PROBLEMS] There is provided a polyisocyanate composition for soft polyurethane foam obtained by performing a urethanization reaction of pure MDI (a) with an equivalent amount or less of polyol (b) under the following conditions and thereafter mixing a polymeric MDI (c) with the reaction product. (2,2'-MDI + 2,4'-MDI)/MDI = 60 to 85 mass%, and MDI/((a) + (C)) = 50 to 90 mass% provided that the component (b) is a polyether polyol of 700 to 10,000 number average molecular weight, 2 to 8 functional groups on average and 10 to 40% in the content of oxyethylene in the repeating units.
A polyisocyanate composition comprising a product which is obtained by reacting diphenylmethane diisocyanate having a 2,4'-diphenylmethane diisocyanate content of 55 to 90% by mass with polyoxyethylene-polyoxypropylene polyol having an oxyethylene content of 1 to 40% by mass, an average hydroxyl equivalent of 700 to 2500, and a nominal average functionality of 2 to 6 and which has an isocyanato group content of 15 to 30% by mass.
[PROBLEMS] To provide a flexible polyurethane foam which has excellent storage stability and is excellent in both air permeability and the feeling of bottoming out which are incompatible with each other. [MEANS FOR SOLVING PROBLEMS] A polyisocyanate composition for flexible polyurethane foam which is obtained by conducting urethane formation reaction of pure MDI (i) with a polyol (ii) in an at most equimolar amount and mixing the obtained product with polymeric MDI (iii) with the following requirements satisfied: (2,2'-MDI + 2,4'-MDI)/MDI = 60 to 90% by mass MDI/((i) + (iii)) = 50 to 90% by mass (ii-1) : (ii-2) = 20 to 40% by mass : 80 to 60% by mass with the proviso that (ii-1) is polyether polyol having Mn of 1,000 to 10,000, an average functionality of 2 to 8, and an oxyethylene repeating unit content of 70% by mole or above, and (ii-2) is polyether polyol having Mn of 1,000 to 10,000, an average functionality of 2 to 8, and an oxypropylene repeating unit content of 80% by mole or above.
COMPOSITION CAPABLE OF FORMING YELLOWING-FREE, LOW-HARDNESS POLYURETHANE ELASTOMER, AND METHOD FOR PRODUCING YELLOWING-FREE, LOW-HARDNESS POLYURETHANE ELASTOMER USING THE SAME
[PROBLEMS] To provide a thermosetting polyurethane elastomer which is free of yellowish, can achieve a low hardness and a breeding-free property without the need of using any plasticizer, and has low tack and little fluctuations in hardness in accordance with the change in temperature. [MEANS FOR SOLVING PROBLEMS] Disclosed is a composition capable of forming a yellowing-free, low-harness polyurethane elastomer, which contains no plasticizer and comprises (A) an isocyanate-terminal prepolymer and (B) a polyester polyol both shown below. (A) An isocyanate-terminal prepolymer: an isocyanate-terminal prepolymer produced through a step for reacting hexamethylene diisocyanate with a glycol having an alkyl group as a side chain and having a molecular weight of 500 or less. (B) A polyester polyol: a polyester polyol produced from trimethylolpropane, 3-methyl-1,5-pentanediol and adipic acid, having an average functional group number of 2.5 to 3.5 and a number average molecular weight of 800 to 5,000.
A two-pack type composition which comprises a water-based polyurethane resin coating composition, an internal crosslinking agent, and an external crosslinking agent and which gives a coating film having a higher hardness. The composition gives a coating film improved in gloss even when the external crosslinking agent has been diluted with a high-boiling solvent in order to heighten the mixability of the external crosslinking agent with a main-ingredient emulsion. The two-pack type water-based polyurethane resin composition is characterized by comprising: an ingredient (A) which is a water-compatible polyurethane resin obtained by reacting a diisocyanate compound (a) with a fatty acid having an active-hydrogen group (b) and with a polyol compound (c) to obtain a urethane prepolymer, incorporating a polyfunctional polyisocyanate compound and a succinate type sulfonic acid salt into the prepolymer, neutralizing the mixture, and then subject it to a chain extension reaction; and an ingredient (B) which includes a polyfunctional polyisocyanate compound dispersible in the ingredient (A).
Disclosed is a method for producing a conductive polyurethane molded body having both good conductivity and good moldability, or a conductive polyurethane molded body attaining high conductivity, while securing adequate moldability. Also disclosed is a conductive roll. A conductive polyurethane molded body is obtained by using an isocyanate containing not less than 60% by mass of 2,4'-diphenylmethane diisocyanate and a polyol as the main material to which at least a conductivity-imparting agent is blended, and reacting and molding the thus-obtained blend. A conductive polyurethane foam is obtained by adding a foaming agent to the blend andreacting the resulting. The conductive polyurethane foam can be suitably used for a conductive roll.
B29C 39/02 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor for making articles of definite length, i.e. discrete articles
F16C 13/00 - Rolls, drums, discs, or the likeBearings or mountings therefor
G03G 15/08 - Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
B29K 75/00 - Use of polyureas or polyurethanes as moulding material
B29L 31/32 - Wheels, pinions, pulleys, castors or rollers
72.
AQUEOUS POLYURETHANE RESIN EMULSION COATING COMPOSITION AND METHOD FOR PRODUCING THE SAME
Disclosed is an aqueous polyurethane resin emulsion coating agent which is improved in film formability (uniformity, durability and the like of a coating layer) at room temperature, without deteriorating various physical properties such as water resistance and solvent resistance. Specifically disclosed is an aqueous polyurethane resin emulsion coating composition which contains, as a main component, a polyurethane resin obtained by mixing a urethane prepolymer (D) with a polyfunctional polyisocyanate (E), then mixing the resulting mixture with water after neutralization for emulsifying and dispersing the mixture, and finally reacting the resulting with a chain extender (F). The urethane prepolymer (D) is obtained by reacting a polyisocyanate (A) containing an allophanate-modified diisocyanate (a1) and an organic diisocyanate (a2), a polymer polyol (B) and a carboxyl group-containing low molecular weight glycol (C).
[PROBLEMS] To provide a process for producing a modified isocyanate mixture containing an allophanate bond and an isocyanurate bond, which is ensured in excellent curability, drying property and weather resistance, and particularly excellent tolerance to a non-polar organic solvent or a less odorous solvent and which has a low viscosity. [MEANS FOR SOLVING PROBLEMS] A process for producing a modified isocyanate mixture containing an allophanate bond and an isocyanurate bond, comprising the steps of: reacting a monoalcohol with an excess amount of an organic polyisocyanate in the presence of an allophanating catalyst to cause the allophanation of the polyisocyanate; removing unreacted organic polyisocyanate until the content of the organic polyisocyanate reaches 1.0% by mass or less; and isocyanurating the resulting product in the presence of an isocyanurating catalyst.
[PROBLEMS] To provide a novel composition capable of forming a thermocurable urethane elastomer which has high hardness that is required in engineering applications such as a structural component or member constituting an industrial machine, has good heat resistance properties (E'100/E'200) and is highly safe. [MEANS FOR SOLVING PROBLEMS] An MDI prepolymer having a low viscosity and mild reactivity can be synthesized by using diphenylmethane diisocyanate containing 2,4-MDI at a ratio of 95% or more and polyol as the main ingredients. When an aromatic diamine containing no chlorine is used as a curing agent, it becomes possible to produce a cast elastomer which is environmentally friendly and has excellent mechanical properties and heat resistance.
Disclosed is a polyisocyanate composition which enables to obtain a hard polyurethane foam which is excellent in storage stability in an ultra-low temperature atmosphere, for example at -5˚C, while exhibiting excellent adhesion to an ultra-low temperature object, for example at -5˚C. Also disclosed is a method for producing a hard polyurethane foam by using such a polyisocyanate composition. Specifically disclosed is a polyisocyanate composition composed of a polymeric MDI, a ricinoleic acid alkyl ester, a silicone foam control agent and a dialkylglycol ether.
Disclosed is a polyisocyanate composition which enables to obtain a hard polyurethane foam which is excellent in storage stability in an ultra-low temperature atmosphere, for example at -5˚C, while exhibiting excellent adhesion to an ultra-low temperature object, for example at -5˚C. Also disclosed is a method for producing a hard polyurethane foam by using such a polyisocyanate composition. Specifically disclosed is a polyisocyanate composition composed of a polymeric MDI, a specific polyether monool, a silicone foam control agent and a dialkylglycol ether.
[PROBLEMS] To provide a process for producing a rigid polyurethane slab foam which does not scorch inside, has a low thermal conductivity, retains excellent flame retardancy over long, and has excellent dimensional stability. [MEANS FOR SOLVING PROBLEMS] A foam-forming composition comprising [A] a modified polyisocyanate which is obtained by modifying at least part of a polymeric MDI having an MDI content of 30-80 mass% with a modifier comprising a polyester polyol having a hydroxy value of 150-300 mg-KOH/g and which has an NCO content of 24.0-28.0%, [B] a polyol ingredient comprising at least 50 mass% at least one member selected among (B1) a polyether polyol made with toluenediamine as an initiator, (B2) a polyether polyol made with sorbitol as an initiator, and (B3) a polyether polyol made with sucrose as an initiator, and [C] a blowing agent comprising water is reacted to cause it to freely foam, with the top kept open.
A urethane-modified diphenylmethane isocyanate composition, produced by adding phosphoric acid or a phosphoric ester to an isocyanate resulting from urethane modification of diphenylmethane isocyanate wherein 50 ppm or more of iron is contained. Accordingly, there can be provided a urethane-modified diphenylmethane isocyanate composition that despite containing 50 ppm or more of iron, would inhibit any viscosity increase as long as the time elapsed is within a given period. It is preferred that the iron content be 110 ppm or less. Further, it is preferred that the ratio of viscosity increase of the urethane-modified diphenylmethane isocyanate composition exhibited at the storage for 28 days at 45°C be 15% or below.
[PROBLEMS] To improve a blocked isocyanate containing polyurethane emulsion to be used in a water-based one-component polyurethane resin coating material not only in dispersibility in water and storage stability but also in various coat performances developed in the neighborhood of the dissociation temperature of the blocked isocyanate. [MEANS FOR SOLVING PROBLEMS] An emulsion composition obtained by forming a blocked polyisocyanate component (A) through the reaction of an organic polyisocyanate (a1) with a polymeric polyol (a2) containing a nonionic polar group and the blocking of NCO groups with a blocking agent (C), reacting an organic polyisocyanate (b1) with a polymeric polyol (b2) and a carboxyl-containing anionic low-molecular glycol (b3) in the above reaction system to prepare a urethane prepolymer (B), neutralizing the carboxyl groups with a neutralizing agent (D), emulsifying the obtained reaction mixture in water, and then subjecting the obtained emulsion to chain extension reaction to form a highly crosslinkable polyurethane resin.
C08G 18/12 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
C08G 18/65 - Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
⏧PROBLEMS] To provide a process for producing a polyurethane foam having a higher durability than a conventional one produced by mechanical froth method. ⏧MEANS FOR SOLVING PROBLEMS] A process for producing a polyurethane foam comprising the steps of mixing (A) an organic polyisocyanate, (B) a polyol, (C) a catalyst and (D) a foam controlling agent in a dispersed state to give a polyurethane foam forming composition, mixing an inert gas with the composition in a dispersed state by a mechanical agitation, foaming the resulting mixture and then curing the foamed product, the polyurethane foam having a poly(oxytetramethylene)polyol content of 50 to 80% by mass, and the foam controlling agent (D) being a dimethylpolysiloxane-polyether block copolymer which has a silicon content of 5 to 20% by mass, has a polyether moiety having an alkyl group at its terminus, and has a number average molecular weight of 1,000 to 2,000.
Disclosed is an aqueous modified polyisocyanate which is intended to be dispersed in an aqueous medium for use. The aqueous modified polyisocyanate can be produced by reacting an HDI derivative with (A) a modifying agent comprising a methoxy polyoxyalkylene glycol composed mainly of an ethyleneoxide unit, (B) a modifying agent comprising a polyoxyalkylene glycol which is produced by using an alcohol having 8 or more carbon atoms as an initiator, which is composed mainly of a propylene oxide unit and which has a hydroxyl group at the terminus, and (C) a modifying agent which has at least one hydroxyl group and which comprises an ester compound having an alkali metal salt of a sulfonic acid introduced therein. In the aqueous modified polyisocyanate, the concentration (calculated value) of the alkali metal salt of the sulfonic acid derived from the modifying agent (C) is 1.5 to 25 &mgr;mol/g. The aqueous modified polyisocyanate has excellent dispersion stability in water under a temperature condition of 35˚C or higher, and an isocyanate group in the aqueous modified polyisocyanate has excellent stability in water.
Disclosed is a diphenylmethane isocyanate composition comprising a composition which is obtained by adding an alkylchlorosilane having 4-24 carbon atoms in total in the molecular structure to a diphenylmethane isocyanate having an acid degree of less than 0.1% by mass. This diphenylmethane isocyanate composition has a high acid degree of not less than 0.1% by mass. The alkylchlorosilane is preferably 1,3-dichlorotetraisopropyldisiloxane or triethylchlorosilane. The diphenylmethane isocyanate composition takes a longer time before starting to increase in viscosity (namely, has a higher storage stability) than the conventional ones.
Polyurethane moldings produced by using as a raw material a polycarbonate polyol prepared by using 3-methyl-1,5-pentane- diol as the main glycol component have improved surface properties. The polycarbonate polyol has a 4-methyltetrahydropyran content of 0.15% by mass or below. The polycarbonate polyol is produced by using a sodium alcoholate represented by the general formula: R-O-Na (wherein R is a hydrocarbon group having 4 or less carbon atoms) as the transesterification catalyst.
A process for the production of colored resin powder which comprises the coloring step of preparing a color paste (B) by mixing 0.5 to 40% by mass of a colorant (b1) with 99.5 to 60% by mass of a non-phthalate plasticizer (b2), adding the paste (B) to a powdered thermoplastic polyurethane-urea resin (A), and subjecting the mixture to blending, wherein the amounts of the colorant (b1) and plasticizer (b2) resulting from the paste (B) added are 0.1 to 5 parts by mass and 1 to 20 parts by mass respectively per 100 parts by mass of the resin (A). This process can give colored resin powder which is free from surface color mottles (segregations) and from the problematic staining of a molded article with a colorant falling off in the molding step.
A composition for polyurethane resin formation which comprises: a main ingredient (A) comprising an isocyanate-terminated prepolymer obtained by reacting an isocyanate-group-containing compound (a1) with a polyfunctional polyether polyol (b1) having a specific molecular-weight distribution obtained using a compound having eight functional groups as an initiator; and a hardener (B) comprising a castor-oil-based modified polyol (b2) obtained from castor oil and/or a castor oil fatty acid and from a trimethylolalkane. This composition for polyurethane resin formation is applicable also to the production of a large hollow-fiber membrane module. It can give a cured resin which is excellent in adhesion and heat resistance and reduced in the temperature dependence of hardness. When the resin is immersed in water, the amount of components extracted with the water is extremely small.
Disclosed is a process for continuous production of a polymethylene polyphenyl polyamine which can produce a polymethylene polyphenyl polyamine continuously by reacting aniline and formaldehyde in the presence of a hydrochloric acid catalyst. The process comprises: (A) a first condensation step in which aniline in an amount of 80-95% by mass relative to the total amount to be charged and a portion of the total amount of formaldehyde to be charged are reacted with each other in the presence of a hydrochloric acid catalyst under such conditions where the hydrogen chloride/aniline ratio (by mole) is 0.99 or less; (B) a second condensation step in which the reaction solution yielded in the first condensation step is mixed with the remainder of formaldehyde to react them with each other; and (C) an isomerization step in which the reaction solution yielded in the second condensation step is mixed with aniline in an amount of 5-20% by mass relative to the total amount to be charged to cause an isomerization reaction between them. According to the process, it becomes possible to produce a polymethylene polyphenyl polyamine which has a reduced N-methyl substance content to the similar level to that in a batch-wise process and contains methylene diphenyl diamine in an amount similar to that in a batch-wide process.
A lubricant composition that without any excess increase of the steering torque of electric power steering apparatus and without any generation of sliding noise, reduces gear-rattling noise to thereby excel in the effect of noise reduction in vehicle interior, and that even when continuously used in high-temperature environment for a prolonged period of time, is capable of favorably sustaining the above effect; a reduction gears making use of the lubricant composition; and a relevant electric power steering apparatus. There is provided a lubricant composition comprising buffer material particles of a polyurethane resin synthesized by reaction of a polyisocyanate, a crosslinking agent having three or more active hydrogen groups per molecule and a polycarbonatepolyol. Further, there is provided reduction gear (50) filled with the above lubricant composition; and provided an electric power steering apparatus having the reduction gear assembled therein.
C10M 169/04 - Mixtures of base-materials and additives
B62D 5/04 - Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
C10M 149/14 - Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds a condensation reaction being involved
F16H 57/04 - Features relating to lubrication or cooling
C10N 30/00 - Specified physical or chemical property which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
C10N 50/10 - Form in which the lubricant is applied to the material being lubricated semi-solidForm in which the lubricant is applied to the material being lubricated greasy
The invention is directed to a powder thermoplastic polyurethane urea resin composition for thermoforming obtained through a step of reacting an isocyanate group-terminated prepolymer, water and/or amine in a dispersion medium. In a chart obtained by measuring the resin composition by GPC, (I) the peak area of an ultrahigh molecular weight component having a number average molecular weight (Mn) of at least 500,000 is 22% or less of the total peak area, and (II) the number average molecular weight of a component relating to the main peak with the largest peak area is 18,000 to 50,000. This resin composition is excellent in melt moldability and can provide a molded article excellent in folding and buckling resistance, abrasion resistance, mechanical characteristics, blooming resistance and the like.
A composition for forming a thermoset polyurethane elastomer. The composition by itself can thermally cure without the need of incorporating thereinto a hardener ingredient (e.g., 1,4-butanediol or trimethylolpropane) as a component of a two-pack curable composition. A molded elastomer having mechanical properties required of constituent parts for industrial machines and apparatuses can be produced from the composition. The composition comprises 100 parts by mass of an isocyanate-terminated urethane prepolymer (A) having an isocyanate group content of 2.0-10.0 mass% and 0.01-0.5 parts by mass of N,N,N'-trimethylaminoethylethanolamine (B). It cures through the formation of allophanate bonds.
It is intended to provide a process for producing a powdered thermoplastic polyurethane urea resin comprising the steps of forming a prepolymer with an isocyanate group at an end by reacting a polymer polyol (a), an organic polyisocyanate (b), a monofunctional active hydrogen group-containing compound (c) and preferably further a bifunctional active hydrogen group-containing compound (d) at a specific ratio and forming a polyurethane urea resin by carrying out a chain extension reaction of the prepolymer with an isocyanate group at an end and water (e) in a non-aqueous dispersion solvent. According to this production process, the powdered thermoplastic polyurethane urea resin excellent in melt moldability can be obtained and the control of the molecular weight of the polyurethane urea resin is easy.
A process for producing an aliphatic isocyanate having an oxyalkylene group which comprises stepwise reacting either an aliphatic amine having an oxyalkylene group or a hydrochloride thereof with phosgene in an ester solvent in at least two temperature ranges to obtain the target isocyanate compound. For example, the amine compound is reacted with phosgene in a temperature range of 0-90°C and then further reacted with phosgene at 90-160°C. This process for producing an aliphatic isocyanate having an oxyalkylene group is efficient and is industrially utilizable.
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