Moulding compositions of vinyl chloride polymers, graft polymers and polymeric plasticizers having a high resistance to ageing

Claim 1

A thermoplastic molding composition comprising, (A) from 25 to 50 parts, by weight, of a vinyl chloride homo- or copolymer containing at least 50% by weight, vinyl chloride; (B) from 25 to 50 parts, by weight, of a mixture of (B)(1): a graft polymer produced by the graft polymerization of (B)(1.1): from 30 to 95 parts, by weight, of a monomer mixture of styrene, methyl methacrylate α-methyl styrene, either individually or in admixture, on the one hand, and acrylonitrile on the other hand, in a ratio of from 90:10 to 60:40; onto (B)(1.2): from 70 to 5 parts by weight of a butadiene homo- or copolymer containing ≦35%, by weight, of comonomer and having a gel content of ≧50%; where the graft polymer has an average particle size of from 0.05 to 5μ; and (B)(2): a copolymer containing α-methyl styrene, styrene, acrylonitrile, methyl methacrylate or a mixture thereof incorporated with ≧30%, by weight, α-methyl styrene; (C) from 0 to 10 parts, by weight, of a thermoplastic copolymer of styrene/acrylonitrile or methyl methacrylate/acrylonitrile having a Staudinger index, η, ≧3 (dl)/g and where η is higher than the Staudinger index of (B); (D) from 5 to 40 parts, by weight, of a copolymer selected from (D)(1): an ethylene/vinyl acetate or an ethylene/acrylic ester copolymer containing ≧50%, by weight, of a polar component and having an average molecular weight of ≧1500; (D)(2): an ethylene/vinyl acetate/carbon monoxide terpolymer containing ≧20%, by weight, of a polar component and having an average molecular weight of ≧1500; (D)(3): a copolymer of: (D)(3.1): from 10 to 99.9 parts, by weight, of an acrylic ester of a C 1 -C 15 alcohol; (D)(3.2): from 0 to 90 parts, by weight, of at least one difunctional or polyfunctional monomer containing conjugated or unconjugated double bonds; and (D)(3.3): 0 to 40%, by weight, based on the sum of the weights of (D)(3.1) and (D)(3.2), of copolymerizable monomers, where (D)(3) has an average molecular weight ≧1500; (E) from 3 to 30 parts, by weight, of: (E)(1): a copolymer produced from: (E)(1.1): 60 to 95 parts, by weight, of a monomer containing two conjugated olefinic double bonds, an acrylic ester of C 1 -C 6 alcohol or a mixture thereof; (E)(1.2): 5 to 40 parts, by weight, of styrene, acrylonitrile, methyl methacrylate or a mixture thereof; (E)(1.3): 0 to 10 parts, by weight, of a bifunctional or polyfunctional monomer or polymer containing conjugated or unconjugated double bonds; and (E)(1.4): 0 to 30 parts, by weight, of copolymerized monomers; copolymer (E)(1) being different from component (D)(3) in at least one parameter and the copolymer (E)(1) having a gel content of ≧70%; (E)(2): an ethylene/propylene terpolymer rubber having a gel content of ≧70% or mixtures thereof.