Polyvinyl chloride lubricant

摘要

Propylene glycol esters of unsaturated fatty acids having from 8 to 20 carbon atoms are found useful as internal lubricants for polyvinyl chloride. As compared to commonly used materials, the use of propylene glycol ester results in improved optical properties, as for example low yellowing after processing and resistance to hazing upon immersion in liquids. The lubricants are used in the manufacture of PVC by bulk or suspension polymerization. Broadly from 0.1 to 5 wt. % of the ester is incorporated into the resin.