Patent ID: 6835776
Filing Date: 2004-12-28
Classification: C08K,C08L

Abstract:
A method of improving the weathering resistance and heat-aging resistance of a thermoplastic molding composition, the composition comprising,A) from 5 to 70% by weight of at least one graft copolymer A) made from, based on A), a1) from 10 to 90% by weight of at least one elastomeric graft base with a glass transition temperature below 0Â° C., and b2) from 10 to 90% by weight of at least one graft made from, based on a2), a21) from 50 to 100% by weight of at least one styrene compound, a22) from 0 to 50% by weight of acrylonitrile or methacrylonitrile, or a mixture of these, and a23) from 0 to 50% by weight of at least one other monoethylenically unsaturated monomer, by incorporating into said thermooplastic molding composition,B) from 29 to 90% by weight of a hard copolymer made from, based on B), b1) from 50 to 100% by weight of at least one styrene compound, b2) from 0 to 50% by weight of acrylonitrile or methacrylonitrile, or a mixture of these, and b3) from 0 to 50% by weight of at least one other monoethylenically unsaturated monomer, C) from 0.01 to 5% by weight of at least one three-block copolymer X-Y-X having a central block Y made from propylene oxide units and having terminal blocks X made from ethylene oxide units, D) from 0.01 to 5% by weight of at least one butylated reaction product of p-cresol with dicyclopentadiene of the formula (I) where n&lE;10,E) from 0.01 to 5% by weight of at least one thiocarboxylic ester, F) from 0.01 to 5% by weight of at least one alkali metal salt or alkaline earth metal salt of a C6-C20 carboxylic acid, and G) from 0 to 30% by weight, based on components A) to G), of other conventional additives, where the weathered db*value of the molding compositions is below +5.0 after 100 hours of exposure to light and weathering to ISO 4892/2, method A, black-panel temperature 65Â° C., using the CIE-Lab color system, to DIN 6174 and DIN 5033, and where all percentages are based on components A) to F).