Patent ID: 7183349

Claim:
A method for improving the chemicals resistance, reducing the swelling, and improving the stress-cracking resistance of styrene-acrylonitrile copolymers having a proportion of acrylonitrile of less than 28% by weight, comprising the step of adding phyllosilicates to said styrene-acrylonitrile copolymers, wherein the styrene-acrylonitrile copolymers have been built up from components A, C, and, where appropriate, and E, using: a: as component A, from 20 to 100% by weight, based on the entirety of components A+B, of a hard component made from one or more copolymers of styrene and/or α-methylstyrene with acrylonitrile, the proportion of acrylonitrile being from 10 to less than 28% by weight, b: from 0 to 80% by weight, based on the entirety of components A+B, of at least one graft copolymer B made from b1: as component B1, from 10 to 90% by weight of at least one elastomeric particulate graft base with a glass transition temperature below 0° C., and b2: as component B2, from 10 to 90% by weight of at least one graft made from polystyrene or from a copolymer of styrene and/or α-methylstyrene with acrylonitrile, the proportion of acrylonitrile being from 10 to less than 28% by weight, where the entirety of the components A+B used is from 10 to 100 parts by weight, based on the total weight of the components used, c: as component C, from 0.05 to 5 parts by weight, based on the total weight of the components used, of a phyllosilicate, and e: as component E, from 0 to 20 parts by weight, based on the total weight of the components used, of other conventional auxiliaries and fillers, and wherein the phyllosilicate is mica.