A METHOD FOR THE PREPARATION OF A POLYVINYL CHLORIDE RESIN

摘要

The dispersing agent in the suspension polymerization of vinyl chloride according to the inventive method is a combination of a monomer-soluble non-ionic surface active agent and a partially crosslinked copolymer of an ethylenically unsaturated polymerizable carboxylic acid compound and a compound having at least two ethylenically unsaturated polymerizable linkages in a molecule. By virtue of the specific dispersing agent, the powdery polyvinyl chloride resin obtained by the polymerization has a high bulk density, greatly decreased number of fish eyes and remarkably improved thermal stability.