Patent ID: 7728073

Claim:
A thermoplastic molding composition, comprising a mixture of (A) from 30 to 69% by weight, based on the sum of components (A), (B) and (C), of a methyl methacrylate polymer obtainable by polymerizing a mixture consisting of (A1) from 90 to 100% by weight, based on (A), of methyl methacrylate, and (A2) from 0 to 10% by weight, based on (A), of a C 1 -C 8 -alkyl ester of acrylic acid, and (B) from 30 to 69% by weight, based on the sum of components (A), (B) and (C), of a copolymer obtainable by polymerizing a mixture consisting of (B1) from 75 to 88% by weight, based on (B), of a styrenic monomer and (B2) from 12 to 25% by weight, based on (B), of a vinyl cyanide and (C) from 1 to 40% by weight, based on the sum of components (A), (B) and (C), of a graft copolymer obtainable from (C1) from 60 to 90% by weight, based on (C), of a core obtainable by polymerizing a monomer mixture consisting of (C11) from 65 to 90% by weight, based on (C1), of a 1,3-diene and (C12) from 10 to 35% by weight, based on (C1), of a styrenic monomer and (C2) from 5 to 20% by weight, based on (C), of a first graft shell and (C3) from 5 to 20% by weight, based on (C), of a second graft shell obtainable by polymerizing a monomer mixture consisting of (C31) from 70 to 98% by weight, based on (C3), of a C 1 -C 8 -alkyl ester of methacrylic acid and (C32) from 2 to 30% by weight, based on (C3), of a C 1 -C 8 -alkyl ester of acrylic acid and (D) optionally, customary additives in amounts of up to 20% by weight, based on the sum of components (A), (B) and (C), with the proviso that the weight ratio of (C2) to (C3) is in the range from 2:1 to 1:2, wherein the first graft shell (C2) is obtainable by polymerizing a monomer mixture consisting of (C21) from 30 to 35% by weight, based on (C2), of a styrenic monomer, (C22) from 63 to 70% by weight, based on (C2), of a C 1 -C 8 -alkyl ester of methacrylic acid and (C23) from 0 to 20% by weight, based on (C2), of a crosslinking monomer.