BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Zhang, Chenxi
Chen, Zhan (james)
Li, Zhijiang
Wu, Fei
Zhao, Hui
Abstract
The invention provides a polyurethane pultrusion article comprising a polyurethane pultrusion composite and a coating layer applied thereon, wherein the polyurethane pultrusion composite comprises a polyurethane resin matrix and a reinforcement material, and is prepared by a polyurethane pultrusion process, wherein the polyurethane resin matrix is prepared from a polyurethane composition comprising: A) an isocyanate component comprising one or more polyisocyanates; B) an isocyanate-reactive component comprising: b1) a first polyether polyol having a functionality of 2-3 and a hydroxyl number of 10-120 mgKOH/g; b2) a second polyether polyol having a functionality of 3-8 and a hydroxyl number of 810-1900 mgKOH/g; b4) one or more isocyanate-reactive flame retardants. The polyurethane pultrusion article provided by the invention has both favorable flame retardance and good adhesion between the coating layer and the composite.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Sun, Guobin
Cheng, Yuan
Gu, Yongming
Zheng, Ian
Xiao, Shuangyin
Abstract
The present invention relates to a free radical polymerizable polyurethane composition comprising a polyurethane having active olefinic bond, and a reactive diluent C), wherein the polyurethane having active olefinic bond is prepared by components including (meth) acrylate, and the polyurethane composition has favorable pot-life, improved heat distortion temperature and lower exothermic peak.
C08G 18/76 - Polyisocyanates or polyisothiocyanates cyclic aromatic
C08G 18/10 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
C08G 18/28 - Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
3.
POLYMER MATERIAL FILLED COMPOSITE ELEMENT AND A PROCESS FOR PREPARING THE SAME
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Xi, Qiang
Gu, Henry
Zheng, Chunlei
Abstract
The present invention provides a process for preparing a polymer material filled composite element, comprising the steps of: i) providing a partially closed space, wherein a polyurethane foam is disposed at least at part of the periphery of the space to restrain the flow of the polymer material resin, and the polyurethane foam is formed by in situ application of a polyurethane composition and has an air flow value of greater than 1L/min as determined by ASTM D3574 test; ii) applying the polymer material resin into the space and curing the polymer material resin to form a polymer material that fills the space.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Spriewald, Jürgen
Abstract
Disclosed is a divided wall column, comprising: a column shell; a divided wall provided vertically inside the column shell, defining a divided wall section between an upper edge and a lower edge of the divided wall; and a liquid distributor provided within the divided wall section, characterized in that, the liquid distributor is fixed only to the column shell but not to the divided wall. By using the divided wall column of the present invention, a defect involved in conventional divided wall columns, i.e. a maldistribution of fluid over mass transfer elements caused by a manufacturing defect of the divided wall resulted from its manufacturing process and/or a deformation thereof under operation conditions, can be minimized or even avoided.
The present invention relates to a process for preparing a polyurethane composite material, comprising steps of: I) preparing a premolded polyurethane molding body, wherein the premolded polyurethane molding body is prepared from a polyurethane composition under a condition that isocyanate groups and isocyanate-reactive groups comprised in the polyurethane composition undergo an addition reaction; II) curing the premolded polyurethane molding body to prepare the polyurethane composite material, wherein the premolded polyurethane molding body cures by the radical polymerization of active olefinic bonds. The process of the present application has a lower TVOC value and better processability.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Sun, Guobin
Gu, Yongming
Wu, Fei
Chen, Zhan
Zheng, Yichen
Cheng, Yuan
Zhao, Hui
Abstract
The present invention relates to a polyurethane composite material, comprising a polyurethane resin matrix prepared from a polyurethane composition, and a reinforcement material, wherein the polyurethane composition comprises: A) an isocyanate component comprising one or more organic polyisocyanates; B) an isocyanate-reactive component comprising: bl) one or more organic polyols having an amount of 21-60 wt.% based on 100 % by weight of the polyurethane composition; b2) one or more (meth)acrylates comprising hydroxyl groups; and C) a radical reaction initiator; wherein the polyurethane resin matrix is prepared under such reaction conditions that the polyurethane composition undergoes addition polymerization reaction of isocyanate groups and hydroxyl groups and radical polymerization reaction simultaneously. The present invention further relates to the preparation process of the polyurethane composite material.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
COVESTRO DEUTSCHLAND AG (Germany)
Inventor
Zhang, John
Xu, Jianfeng
Cao, Zhong
Abstract
The present invention relates to a transparent and abrasion resistant polyurethane elastomer prepared from a polyurethane composition under a mold pressure of 1-5 ton, wherein the polyurethane composition comprises: a) an isocyanate component comprising one or more organic polyisocyanates; b) an isocyanate-reactive component comprising: b1) polyester polyol, polyether polyol or a combination thereof; b2) one or more aliphatic diols having a molecular weight of less than 200 and an amount of 0.1-3.5 wt.%, based on 100 wt.% by weight of the isocyanate-reactive component; c) a polydiene, which is prepared by homopolymerization or copolymerization of aliphatic diene having 4-10 carbon atoms.
The present invention relates to a process for preparing a precast polyurethane-based concrete insulation element comprising a base layer, a core layer and optional surface layer, comprising the steps of: I) providing uncured base layer which is prepared from uncured concrete;II) forming the core layer on the base layer by applying a first polyurethane reaction system onto the base layer, wherein the first polyurethane reaction system cures to form a polyurethane rigid foam serving as the core layer;III) optionally applying a cured or uncured concrete onto the core layer; and IV) curing the cured or uncured concrete to form the base layer and the optional surface layer.
B29C 44/08 - Shaping by internal pressure generated in the material, e.g. swelling or foaming for articles of definite length, i.e. discrete articles using several expanding steps
The invention relates to glass-fibre reinforced polycarbonate compositions with high stiffness and with improved thermal and rheological behaviour in combination with improved flame-retardancy properties. The inventive composition can be used to produce mouldings, especially those thin-walled housing parts or switch boxes with a wall thickness from 1.0 mm to 0.75 mm in the EE and IT sectors, while still meet the requirements for the fire-protection classification UL 94 V1, preferably V0.
C08K 5/521 - Esters of phosphoric acids, e.g. of H3PO4
C08J 5/08 - Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
C08L 53/00 - Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bondsCompositions of derivatives of such polymers
10.
POLYURETHANE RESIN COMPOSITION AND POLYURETHANE COMPOSITE PREPARED FROM THE SAME
The present invention relates to a polyurethane resin composition for preparing a polyurethane composite, having a) anorganic polyisocyanate; b) an isocyanate-reactive component having b1) one or more polyether carbonate polyols which are prepared by addition of carbon dioxide and alkylene oxides onto starters having active hydrogen using DMC catalysts, and b2) one or more polyols which have a functionality of 2-6 and are selected from polyether polyols, polyester polyols, polymer polyols or combinations thereof; and c) a blowing agent having an amount of 0-0.2 wt.% based on 100% by weight of the isocyanate-reactive component b).
B29C 70/48 - Shaping or impregnating by compression for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM]
The present invention relates to a polyester polyurethane material with long term hydrolysis resistance which is prepared from perchlorates and a polyester polyol comprising structure unit I, II, and III. The polyester polyurethane material having a mole ratio of structure unit II to III of 1:1.5 to 1.5:1 has better long term hydrolysis resistance. In another aspect of the present invention, there is provided soles, carpets, rollers, sealing strips, coating, tires, wipers, steering wheels or gaskets prepared from the polyester polyurethane material, and a use of the polyester polyurethane material.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Zhang, Frank
Shen, Jianping
Fan, Ziqi
Abstract
The present invention relates to a two-component waterborne polyurethane coating composition, comprising: (a) one or more polyol aqueous dispersion or aqueous emulsion, wherein the polyol has a hydroxyl content of 0.5-5.5 wt.%, based on 100% by weight of the polyol, and the polyol aqueous dispersion or aqueous emulsion has a solid content of 10-70 wt.%, based on 100% by weight of the polyol aqueous dispersion or aqueous emulsion; and (b) one or more hydrophilic modified isophorone diisocyanate polymer or prepolymer, wherein the component (a) and (b) are of such an amount that the ratio of the NCO group to the hydroxyl group in the two-component waterborne polyurethane coating composition is 0.2:1 to 5:1. The two-component waterborne polyurethane coating composition has anti-yellowing property under high temperature, and the coating film prepared from the same has a color difference of less than 3.0 after baking under 150℃ for 1 day.
C08G 18/70 - Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
C08G 18/62 - Polymers of compounds having carbon-to-carbon double bonds
The present invention relates to a polyurethane composition for repairing polyurethane ballast bed, comprising: amine initiated polyether polyol, short chain polyether polyol and long chain polyether polyol. The polyurethane foam prepared from the polyurethane composition has favorable tensile strength and hardness, and can be used to support sleepers so as to repair settling polyurethane ballast bed.
E01B 27/00 - Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the trackDevices thereforPacking sleepers
14.
METHOD FOR THE PRODUCTION OF POLYURETHANE FOAM USING EMULSIFIED BLOWING AGENT
BAYER MATERIALSCIENCE(CHINA) COMPANY LIMITED (China)
HEFEI HUALING CO.,LTD. (China)
Inventor
Albers, Reinhard
Heinemann, Torsten
Vogel, Stephanie
Loof, Michael
Gu, Zhihong
Urano, Atsushi
Suk, Sangjo
Zhao, Shihu
Abstract
Provided is a method for the production of polyurethane foam, comprising the steps of: -providing an isocyanate-reactive component A comprising a polyol component Al which further comprises a physical blowing agent T; -combining at least the isocyanate-reactive component A and an isocyanate component B, thereby obtaining a polyurethane reaction mixture; -providing the polyurethane reaction mixture in a cavity (11); and reducing the pressure within the cavity (11) to a pressure lower than ambient pressure; characterized in that the physical blowing agent T is present in the isocyanate-reactive component A in the form of an emulsion with the polyol component Al constituting the continuous phase and droplets of the physical blowing agent T the dispersed phase of the emulsion, wherein the average size of the droplets of the physical blowing agent T is >0.1μm to <20μm, the droplet size being determined by using an optical microscope operating in bright field transmission mode.
C08G 18/64 - Macromolecular compounds not provided for by groups
C08J 9/14 - 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 organic
15.
VACUUM-SUPPORTED METHOD FOR PRODUCTION OF POLYURETHANE FOAM
BAYER MATERIALSCIENCE (CHINA) COMPANY LIMITED (China)
HEFEI HUALING CO., LTD. (China)
Inventor
Albers, Reinhard
Heinemann, Torsten
Vogel, Stephanie
Loof, Michael
Gu, Zhihong
Urano, Atsushi
Suk, Sangjo
Zhao, Shihu
Abstract
A method for the production of polyurethane foam is provided, comprising the steps of: (a) providing an isocyanate-reactive component A comprising a polyol component A1 which further comprises a physical blowing agent T; (b)combining at least the isocyanate-reactive component A and an isocyanate component B, thereby obtaining a polyurethane reaction mixture; (c)providing the polyurethane reaction mixture in a cavity; (d) reducing the pressure within the cavity to a pressure lower than ambient pressure; and (e) the cavity is ventilated to ambient pressure before the gel time of the polyurethane reaction mixture is reached.
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
The present invention relates to a process for the production of coated textiles in which a textile substrate is firstly brought into contact with an aqueous dispersion comprising at least one inorganic salt and at least one modified cellulose, afterwards it is brought in contact with an aqueous dispersion comprising a polymer selected from polyacrylate or polybutadiene and at the end this polymer is precipitated.
D06N 3/00 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
D06N 3/04 - 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 by reactions only involving carbon-to-carbon unsaturated bonds
D06N 3/02 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with cellulose derivatives
D06N 3/10 - 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 by reactions only involving carbon-to-carbon unsaturated bonds with styrene-butadiene copolymerisation products
D06N 3/18 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
D06M 15/263 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acidsSalts or esters thereof
D06M 15/693 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with macromolecular compoundsSuch treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
A process for production of coated textiles is provided, in which a textile substrate is firstly brought into contact with an aqueous dispersion comprising at least one inorganic salt and at least one modified cellulose, secondly brought into contact with an aqueous dispersion comprising at least on polymer selected from the group consisting of polyacrylate and polybutadiene.
D06M 11/00 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereofSuch treatment combined with mechanical treatment, e.g. mercerising
D06M 15/263 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acidsSalts or esters thereof
A process for the production of coated textiles comprises at least the steps of a) bringing a textile substrate into contact with an aqueous dispersion A comprising at least one salt and at least one modified cellulose, b) bringing a textile substrate into contact with an aqueous dispersion B comprising at least one polymer selected from the group consisting of polyurethane, polyacrylate and polybutadiene and c) precipitation of the polyurethane in or on the textile substrate. The salt of dispersion A is an organic onium salt of one or more elements of the fifth main group of the periodic table of the elements. The invention further relates to a coated textile obtainable by a process according to the invention and to the use of organic onium salts of one or more elements of the fifth main group of the periodic table of the elements for the production of coated textiles.
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
D06N 3/00 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
D06N 3/02 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with cellulose derivatives
D06N 3/18 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
A process for the production of coated textiles comprises at least the steps of a) bringing a textile substrate into contact with an aqueous dispersion A comprising at least one salt and at least one modified cellulose, b) bringing a textile substrate into contact with an aqueous dispersion B comprising at least one polymer selected from the group consisting of polyurethane, polyacrylate and polybutadiene and c) precipitation of the at least one polymer selected from the group consisting of polyurethane, polyacrylate and polybutadiene in or on the textile substrate. The salt of dispersion A is an organic onium salt of one or more elements of the fifth main group of the periodic table of the elements. The invention further relates to a coated textile obtainable by a process according to the invention and to the use of organic onium salts of one or more elements of the fifth main group of the periodic table of the elements for the production of coated textiles.
D06M 13/322 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with non-macromolecular organic compoundsSuch treatment combined with mechanical treatment with compounds containing nitrogen
D06M 13/282 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with non-macromolecular organic compoundsSuch treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing phosphorus
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
A process for the production of coated textiles comprises the steps of: providing a textile substrate having a first side and a second side opposing the first side; contacting at least a part of the first side of the textile substrate with a spreadable polyurethane mechanical foam; applying a reduced pressure to at least a part of the second side of the textile substrate opposing the first side which has been contacted with the polyurethane mechanical foam; and solidifying the polyurethane mechanical foam with which the textile substrate has been contacted. The invention further relates to a coated textile obtainable by such a process, in particular a synthetic leather.
D06M 15/564 - Polyureas, polyurethanes or other polymers having ureide or urethane linksPrecondensation products forming them
D06N 3/00 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
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
B32B 5/20 - 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 foamed in situ
A process for the production of coated textiles comprises the steps of: providing a textile substrate having a first side and a second side opposing the first side; contacting at least a part of the first side of the textile substrate with a spreadable polyurethane mechanical foam; applying a reduced pressure to at least a part of the second side of the textile substrate opposing the first side which has been contacted with the polyurethane mechanical foam; and solidifying the polyurethane mechanical foam with which the textile substrate has been contacted. The invention further relates to a coated textile obtainable by such a process, in particular a synthetic leather.
C07C 227/00 - Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
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 process for the production of ballast in railway track laying, road construction, dam construction and bank protection. The ballast consists of ballast stones and polyurethane foams based on a reaction mixture of polyisocyanates and compounds with isocyanate-reactive groups, wherein, the reactive mixture is produced from components by a low-pressure process.
A process for the production of ballast for railway track laying, road construction, dam construction and bank protection, wherein ballast stones are spread out to form ballast and a reaction mixture for the preparation of a polyurethane foam, produced from components by a low-pressure process, is applied between the spread ballast stones.
The present invention relates to a process for the production of coated textiles in which a textile substrate is firstly brought into contact with an aqueous dispersion comprising at least one inorganic salt and at least one modified cellulose.
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
D06N 3/02 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with cellulose derivatives
D06N 3/00 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
B32B 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatingsLayered products designed for particular purposes not covered by another single class
The present invention relates to a process for the production of coated textiles in which a textile substrate is firstly brought into contact with an aqueous dispersion comprising at least one inorganic salt and at least one modified cellulose.
D06M 15/564 - Polyureas, polyurethanes or other polymers having ureide or urethane linksPrecondensation products forming them
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
BAYER MATERIALSCIENCE (CHINA) COMPANY LIMITED (China)
Inventor
Bruder, Friedrich-Karl
Haese, Wilfried
Oser, Rafael
Fischer, Wolfgang
Ludewig, Michael
Wong, Raymond
Zhang, Ice
Abstract
This invention relates to DVDs made from polycarbonate and a special UV curable bonder material consisting of A) an urethane acrylate oligomer as binder, which is the reaction product of i) one or more polyisocyanates and ii) one or more hydroxyfunctional lactone ester (meth)acrylates having a number average molecular weight of from 200 g/mol to 2000 g/mol and having the formula: CH2 = C ( R1) - C ( O ) - O - R2 - [ O - C( O) - R3]n - OH wherein, n is an integer from 1 to 5, R1 is hydrogen or methyl, R2 represents an alkylene group or substituted alkylene group having from 2 to 10 carbon atoms and R3 represents a straight or branched chain alkylene group of from 3 to 8 carbon atoms, and which may be substituted with one or more alkyl groups having from 1 to 12 carbon atoms, B) a reactive thinner, comprising of mono functional acrylates and/or (meth)acrylates C) a photoinitiator and D) optional additives which offers improved performance at high data transfer rates.
BAYER MATERIALSCIENCE (CHINA) COMPANY LIMITED (China)
Inventor
Bruder, Friedrich-Karl
Haese, Wilfried
Oser, Rafael
Fischer, Wolfgang
Ludewig, Michael
Wong, Leung Man
Zhang, Qian
Abstract
This invention relates to DVDs made from polycarbonate and a special UV curable bonder material consisting of A) an urethane acrylate oligomer as binder, which is the reaction product of i) one or more polyisocyanates and ii) one or more hydroxyfunctional lactone ester (meth)acrylates having a number average molecular weight of from about 200 g/mol to about 2000 g/mol and having the formula: CH2 = C ( R1) - C ( O ) - O - R2 - [ O - C( O) - R3]n - OH, wherein, n is an integer from 1 to 5, R1 is hydrogen or methyl, R2 represents an alkylene group or substituted alkylene group having from 2 to 10 carbon atoms and R3 represents a straight or branched chain alkylene group of from 3 to 8 carbon atoms, and which may be sub- stituted with one or more alkyl groups having from 1 to 12 carbon atoms, B) a reactive thin ner, comprising of monofunctional acrylates and/or (meth)acrylates, C) a photoinitiator and D) optional additives which offers improved performance at high data transfer rates.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Bruder, Friedrich-Karl
Haese, Wilfried
Oser, Rafael
Protte, Rainer
Meyer, Alexander
Hildenbrand, Karlheinz
Wong, Raymond
Zhang, Ice
Abstract
This invention relates to an optical recording medium in which at least a recording layer and a light transmitting layer are sequentially formed on a substrate and in which the light is illuminated from the light transmitting layer side for recording and/or reproducing information signals, said substrate comprising an injection molded part, and said substrate having a Young's modulus E of at least 2.15 GPa and a Q factor of lower than 160 measured at 25°C at 2000 Hz in accordance to ASTM E 756-05 05 and a transcriptability of the pit / groove structure of > 85%.
BAYER MATERIALSCIENCE (CHINA) COMPANY LTD. (China)
Inventor
Bruder, Friedrich-Karl
Haese, Wilfried
Oser Rafael
Blaschke, Ulrich
Wong, Raymond
Zhang, Ice
Wehrle, Jörg
Roppel, Michael
Abstract
This invention relates to the use of polycarbonate for the production of an optical recording medium in which secure high speed operation, a transcriptability of the pit/groove structure of > 85% and sufficient disc flatness can be achieved.
patents