Polymer composition comprising nitrile copolymer, CPE and rubber

摘要

Disclosed is an impact-resistant polymer composition based on a copolymer of an unsaturated nitrile, a substantially saturated rubber and a chlorinated polyethylene. To maintain high impact resistance while retaining good processing properties, the polymer composition comprises: A. 40-95 parts by weight of at least one copolymer obtained by polymerizing a mixture of: (1) 10-90 weight % of one or more monomers selected from the group consisting of styrene and derivatives thereof, and (2) 90-10 weight % of one or more monomers selected from the group containing of acrylonitrile and methacrylonitrile; and B. 5-60 parts by weight of a mixture comprising: (1) a substantially saturated rubber, and (2) chlorinated polyethylene having a chlorine content of from 32 to 45 weight %, a DSC crystallinity viscosity of at least 1.0, and wherein the weight ratio between rubber and chlorinated polyethylene is from 2:1 to 1:10.