Processing aid for polyvinyl chloride

Details Processing aid for polyvinyl chloride Processing aid for polyvinyl chloride

C - Chemistry, Metallurgy

08

F

400/2052, 400/30

C08F 259/04 (2006.01) C08L 27/06 (2006.01) C08L 51/00 (2006.01)

Patent

CA 1056540

PROCESSING AID FOR POLYVINYL CHLORIDE Abstract of the Disclosure A process is disclosed for preparing a polyacrylate- modified polyvinyl chloride processing aid for polyvinyl chloride by sequentially polymerizing the vinyl chloride and the desired acrylate ester monomer. Thus, a conventional vinyl chloride suspension polymerization is conducted and at about 60-80% of its completion a minor proportion of a methyl meth- acrylate-ethyl acrylate mixture is added and polymerization is resumed so that the mixture forms a copolymer with residual vinyl chloride monomer. An additional minor portion of methyl methacrylate-ethyl acrylate is then added to graft polymerize onto the copolymer. The polyacrylate-modified PVC thereby recovered is an effective aid for processing conventional PVC, or it can be processed per se since it is suitable for calendering or extruding.

220463

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