Rubber-like thermoplastic polymer mixtures

Soft polymer mixtures of

• (a) from 10 to 50 parts by weight of a graft polymer containing 40 to 15% by weight of graft polymerized alkyl methacrylate, acrylonitrile, styrene, alkyl acrylate or mixtures thereof grafted onto 60 to 85% by weight of the graft of a particulate highly cross-linked diene or alkylacrylate rubber with a gel content above 80% by weight and a particle size of 0.08 to 0.7 .mu.m, and
• (b) from 90 to 50 parts by weight of a partially crosslinked particulate, rubber-like copolymer of 10 to 35% by weight of acrylonitrile and/or methyl methacrylate and 90 to 65% by weight of C.sub.1 to C.sub.8 alkyl acrylate, having a gel content of from 60 to 90% by weight and an average particle diameter (d.sub.50) of from 0.1 to 0.6 .mu.m.