Process for producing high impact styrene resin by continuous bulk polymerization

Abstract From the Canadian patent

Disclosed is a process for producing a high impact styrene resin by continuous bulk polymerization and a high impact styrene resin produced by the process. The resin is produced in the presence of a rubbery polymer in a tubular reactor having static mixing means such as a static mixer without using a stirred tank reactor. A part of an initial-stage polymer solution is recycled and joined with a feed material solution. The rubbery polymer and the recycled initial-stage polymer solution are easily divided into fine particles uniformly dispersed. As a result the grafting ratio is increased and a high impact styrene resin having excellent strength is obtained in which the grafted rubbery …