PROCESS FOR THE PREPARATION OF COLOUR STABILISED VINYL CHLORIDE POLYMERS

摘要

The present invention provides a process in which effective colour stabilisation of polyvinyl chloride is achieved by incorporating during vinyl chloride polymerisation a very small quantity (0.005 to 0.04% by weight) of an acyl acetophenone stabiliser of the formula: wherein R represents an alkyl or aryl group optionally substituted by a carboxyl group, or an alkylene group linking with another 3-phenyl-1,3-oxopropyl moiety, and subsequently blending the resulting polyvinyl chloride with one or more divalent metal carboxylates.