PRODUCTION OF STYRENE RESINS BY CONTINUOUS BULK POLYMERIZATION

摘要

A process for producing a styrene resin by continuous bulk polymerization using a polymerization apparatus comprising a circulating line (I) for initialstage polymerization including at least one tubular reactor having fixedly set therein a plurality of mixing elements having no moving parts and a main-polymerization line (II) following the circulating line (I) and including at least one tubular reactor having fixedly set therein a plurality of mixing elements having no moving parts; characterized in that while a polymerization solution containing a styrene monomer (A), an organic solvent (B) and an organic peroxide (C) whose half life reaches 10 hours at a temperature of 75 to 130 .degree.C is polymerized in the intitial stage while it is circulated through the circulating line (I), and at the same time, a minor part or a major part of the initial-stage polymerization solution is introduced continuously into the main-polymerization line (II) and polymerized.