Process for preparing copolymers of .alpha.-methylstyrene...

Details Process for preparing copolymers of .alpha.-methylstyrene... Process for preparing copolymers of .alpha.-methylstyrene...

C - Chemistry, Metallurgy

08

F

402/488

C08F 2/22 (2006.01) C08F 212/10 (2006.01)

Patent

CA 2027223

Abstract of the Invention 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 75/25 to 85/15 until the amount of unreacted alpha-methylstyrene plus acrylonitrile based on total monomer and polymer weight is 20-45 percent and the excess of unreacted alpha-methylstyrene monomer is from 670 to 5000 weight percent based on unreacted acrylonitrile, thereafter polymerizing a second monomer feed stream comprising acrylonitrile until the amount of unreacted alpha-methylstyrene plus acrylonitrile remaining in the reactor is 5-15 percent based on total monomer weight, and continuing the emulsion polymerization until total monomer conversion reaches at least 90 percent. 35,455A-F

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