Patent ID: 9090715
Filing Date: 2015-07-28
Classification: C08F,C08L

Abstract:
1. A method for producing high impact polystyrene comprising: feeding at least one vinyl aromatic monomer and at least one elastomer to at least one polymerization reactor to form a first reaction mixture; polymerizing the first reaction mixture to form a second reaction mixture; combining a chain transfer agent with the second reaction mixture leaving the at least one polymerization reactor to form a combined mixture, wherein the chain transfer agent is selected from the group consisting of 9,10-dihydroanthracene, β-bromostyrene, 9,10-dihydrophenanthrene, 1-phenyl-3,4-dihydronaphthalene, and combinations thereof; sending the combined mixture to a devolatilization zone; and obtaining a high impact polystyrene product from the devolatilization zone.