Method for the suspension polymerization of vinyl chloride...

Details Method for the suspension polymerization of vinyl chloride... Method for the suspension polymerization of vinyl chloride...

C - Chemistry, Metallurgy

08

F

402/397, 402/546

C08F 14/06 (2006.01) C08F 2/20 (2006.01)

Patent

CA 1250086

ABSTRACT OF THE DISCLOSURE The invention provides an improvement in the suspension polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride in an aqueous medium containing a nonionic surface active agent and in the presence of a mono- mer-soluble polymerization initiator, according to which the aqueous polymerization medium is admixed with a crosslinked copolymer having carboxyl groups such as a copolymer of ac- rylic acid and diethyleneglycol bisallyl or bismethallyl ether at a moment when the percentage of the monomer conver- sion is in the range from 1 to 20 % so that a polyvinyl chloride resin product of high quality can be obtained hav- ing an outstandingly high bulk density and plasticizer ab- sorptivity but still containing an extremely small number of fish eyes.

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