Process for preparing copolymers of alpha-methylstyrene and acrylonitrile

摘要

Copolymers of alpha -methylstyrene and acrylonitrile having improved composition of uniformity are prepared by emulsion polymerizing a first monomer stream having a weight ratio of alpha -methylstyrene/acrylonitrile from about 75/25 to about 85/15 and thereafter polymerizing a second monomer feed stream comprising acrylonitrile.