PROCESS FOR PREVENTING THE FORMATION OF COATINGS IN THE PREPARATION OF POLYMERS AND CO-POLYMERS OF VINYL CHLORIDE IN SUSPENSION POLYMERIZATION

摘要

Encrustations on reactor walls and associated equipment employed in the aqueous suspension polymerization of vinyl chloride and mixtures thereof with other monomers at 30 DEG -70 DEG C. are prevented by employing in the polymerization charge 0.0005 - 0.05% by weight of hydrogen peroxide, calculated on the monomer or monomers, preferably at a pH of at least 7.5, e.g., 7.5 - 8.5 when using a suspending agent which is sensitive to hydrolysis.