Copolymer blends

Claim 1

A blend of from 2 to 60% by weight of I. a copolymer of from about 50 to 70% by weight of methyl methacrylate and correspondingly from about 50 to 30% by weight of styrene, and from 98 to 40% by weight of Ii. a copolymer prepared by the polymerization of 100 parts by weight of (A) more than 50% by weight of at least one nitrile having the structure ##STR5## wherein R is hydrogen, a lower alkyl group having from 1 to 4 carbon atoms, or a halogen, (B) less than 50% by weight based on the combined weights of (A) plus (B) of styrene, in the presence of from 0 to 40 parts by weight of (C) a rubbery polymer of a conjugated diene monomer selected from the group consisting of butadiene and isoprene and optionally at least one comonomer selected from the group consisting of styrene, a nitrile monomer having the structure ##STR6## wherein R has the foregoing designation, and an ester having the structure ##STR7## wherein R 1 is hydrogen, an alkyl group having from 1 to 4 carbon atoms, or a halogen, and R 2 is an alkyl group having from 1 to 6 carbon atoms, said rubbery polymer containing from 50 to 100% by weight of polymerized conjugated diene and from 0 to 50% by weight of comonomer.