Process for the preparation of postchlorinated polyvinyl chloride with increased thermal resistance.

摘要

A process for the production of after-chlorinated polyvinyl chloride comprises suspending eutactic, e.g. syndiotactic, polyvinyl chloride, prepared by redox polymerization at -20 DEG to +5 DEG C., in aqueous hydrochloric acid, contacting the polymer with chlorine and irradiating the mixture with high energy radiation or ultra-violet light at +15 DEG to +30 DEG C. The reaction may be effected in the presence of a swelling agent for the polymer, e.g. chloroform. The process is said to yield products which are at least 55% syndiotactic.