Abstract

A novel purging compound is disclosed which facilitates and improves extrusion of resins where the extruded material is transitioned from a polyamide to a polyethylene or other polyolefin. Compositions according to the invention comprise a major portion of non-polar base polymer compound with an ethylene-methacrylate copolymer; up to 15% of a particulate mineral and about 1% of an antioxidant.

IPC Classes  ?

• B29C 31/10 - Feeding, e.g. into a mould cavity of several materials
• B29C 48/25 - Component parts, details or accessoriesAuxiliary operations
• C08K 13/00 - Use of mixtures of ingredients not covered by any single one of main groups , each of these compounds being essential
• C08L 33/10 - Homopolymers or copolymers of methacrylic acid esters

Abstract

A purging compound for purging an extruder of polyamides or other polar thermoplastic resins for transitioning to the extrusion of a non-polar thermoplastic resin, includes a non-polar base polymer compounded with an ethylene-methacrylate copolymer, up to 15% of a mineral, and about 1% of a suitable antioxidant.

IPC Classes  ?

• B08B 9/02 - Cleaning pipes or tubes or systems of pipes or tubes
• B08B 9/00 - Cleaning hollow articles by methods or apparatus specially adapted thereto

Abstract

Ultra-fine sodium bicarbonate powder (mean particle size less than 5 microns) is produced by the mixing and reaction under agitation at control temperatures of solutions of ammonium bicarbonate and sodium chloride. Precipitated sodium bicarbonate is separated by filtration as a slurry which is dried to produce ultra-fine sodium bicarbonate. Ultra-fine sodium bicarbonate produced by this method also exhibits a narrow particle size distribution which is advantageous in blowing agents for thermoplastic resins, to produce a foamed resin with small cells of a narrow size distribution.

IPC Classes  ?

• C01D 7/10 - Preparation of bicarbonates from carbonates
• B29C 44/00 - Shaping by internal pressure generated in the material, e.g. swelling or foaming

Abstract

A method is described for preparing liquid concentrates of additives for incorporation in polymers, particularly polymers prepared in solution or slurry phase polymerization media. Additive concentrates according to the invention are characterized by a finer dispersion than would result from the direct addition of particulate or granular additives to the same liquid solvent.

IPC Classes  ?

• C09K 15/18 - Anti-oxidant compositionsCompositions inhibiting chemical change containing organic compounds containing nitrogen containing an amine or imine moiety
• C09K 15/02 - Anti-oxidant compositionsCompositions inhibiting chemical change containing inorganic compounds
• C09K 15/30 - Anti-oxidant compositionsCompositions inhibiting chemical change containing organic compounds containing heterocyclic ring with at least one nitrogen atom as ring member
• C09K 15/32 - Anti-oxidant compositionsCompositions inhibiting chemical change containing organic compounds containing boron, silicon, phosphorus, selenium, tellurium or a metal
• C09K 15/08 - Anti-oxidant compositionsCompositions inhibiting chemical change containing organic compounds containing oxygen containing a phenol or quinone moiety
• B29B 9/06 - Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion

Abstract

A method is described for preparing liquid concentrates of additives for incorporation in polymers, particularly polymers prepared in solution or slurry phase polymerization media. Additive concentrates according to the invention are characterized by a finer dispersion than would result from the direct addition of particulate or granular additives to the same liquid solvent.

IPC Classes  ?

• C08J 3/205 - Compounding polymers with additives, e.g. colouring in the presence of a liquid phase
• C08K 5/13 - PhenolsPhenolates
• C08K 5/49 - Phosphorus-containing compounds
• C08K 7/16 - Solid spheres

Abstract

A method is described for preparing liquid concentrates of additives for incorporation in polymers, particularly polymers prepared in solution or slurry phase polymerization media. Additive concentrates according to the invention are characterized by a finer dispersion than would result from the direct addition of particulate or granular additives to the same liquid solvent.

IPC Classes  ?

• C08J 3/205 - Compounding polymers with additives, e.g. colouring in the presence of a liquid phase
• B01F 3/20 - Pretreatment of the materials to be mixed
• C08K 5/13 - PhenolsPhenolates
• C08K 5/49 - Phosphorus-containing compounds
• C08K 7/16 - Solid spheres

Abstract

Ultra-fine sodium bicarbonate powder (mean particle size less than 5 microns) is produced by the mixing and reaction under agitation at control temperatures of solutions of ammonium bicarbonate and sodium chloride. Precipitated sodium bicarbonate is separated by filtration as a slurry which is dried to produce ultra-fine sodium bicarbonate. Ultra-fine sodium bicarbonate produced by this method also exhibits a narrow particle size distribution which is advantageous in blowing agents for thermoplastic resins, to produce a foamed resin with small cells of a narrow size distribution.

IPC Classes  ?

• C01D 7/18 - Preparation by the ammonia-soda process
• B01D 37/00 - Processes of filtration
• B01D 9/02 - Crystallisation from solutions
• B01J 2/02 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
• C01D 7/38 - Preparation in the form of granules, pieces, or other shaped products

Goods & Services

(1) Pelletized, dust-free compositions of plastics additives for use in the molding of thermoplastic resins.