Increasing rubber phase volume in rubber-modified polystyrene

摘要

A process for producing rubber modified polymers having an increased rubber phase volume, including feeding a vinyl aromatic monomer and an elastomer to a polymerization reactor to form a reaction mixture, polymerizing the reaction mixture, combining a copolymer to the polymerized reaction mixture to form a combined mixture, subjecting the combined mixture to further polymerization, and obtaining a rubber modified polymer product from the further polymerization.

主权项

1. A method for increasing rubber phase volume in high impact polystyrene, comprising:
feeding at least one vinyl aromatic monomer, an elastomer, a copolymer, and an initiator to a first reactor to form a reaction mixture, wherein the copolymer is added in amounts ranging from 0.5 to 40 wt. % based on a total weight of the elastomer; polymerizing the reaction mixture in the first reactor to a point below the point at which phase inversion occurs; feeding the reaction mixture from the first reactor to a second reactor; and polymerizing the reaction mixture in the second reactor to at least a phase inversion point of the mixture.