Process for preparing impact resistant styrene polymers

Details Process for preparing impact resistant styrene polymers Process for preparing impact resistant styrene polymers

C - Chemistry, Metallurgy

08

F

18/1213, 400/203

C08F 255/06 (2006.01) B29C 47/00 (2006.01) C08J 3/24 (2006.01)

Patent

CA 1090499

Abstract of the disclosure: There is disclosed a process for preparing impact resi- stant styrene graft copolymers having improved properties, especially a high gloss. They are obtained by polymerizing a solution of an EPTR in a mixture of styrene and acryloni- trile in one step (mass polymerization) or two steps (mass/ suspension polymerization) in the presence of an organic per- oxide and submitting the polymer to a two step extrusion, the first step being carried out at temperatures of from 130 to 240°C, the second step at temperatures of from 200 to 280°C, and providing that during the second extrusion step a quantity of about 0.05 to about 0.5% by weight of the organic peroxide is still present.

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