Patent ID: 9212278
Filing Date: 2015-12-15
Classification: C08F,C08L

Abstract:
1. A method for making high impact polystyrene, comprising: combining styrene monomer and an elastomeric component as a mixture in a polymerization reactor, wherein the styrene monomer is presents in an amount of from 70 to 95 wt % based on a total weight of the mixture, and wherein the elastomeric component is present in an amount of from 3 to 20 wt % based on the total weight of the mixture; polymerizing the mixture of the styrene monomer and the elastomeric component in the presence of a polymerization initiator and a chain transfer agent and under agitation conditions sufficient to provide salami morphology rubber particles with average rubber particle size of from 1 to 1.3 microns, wherein the polymerization initiator is present in an amount of from 150 to about 600 ppm by weight based on the total weight of the mixture, and wherein the chain transfer agent is present in an amount of from 100 to about 500 ppm by weight based on the total weight of the mixture; and recovering a high impact polystyrene product with a 60 degree gloss of at least 90, a Gardner drop of at least 10 in-lb, and an Izod impact strength of at least 1.8 ft-lb/in; wherein the elastomeric component comprises polybutadiene and styrene butadiene copolymer.