Process for the polymerization of ethylenically unsaturated...

Details Process for the polymerization of ethylenically unsaturated... Process for the polymerization of ethylenically unsaturated...

C - Chemistry, Metallurgy

08

F

252/121, 402/374

C08F 2/20 (2006.01) C07C 409/00 (2006.01) C08F 2/16 (2006.01) H01B 3/44 (2006.01)

Patent

CA 1160618

Abstract of the Disclosure A process for the polymerization of ethylenically unsaturated monomers, such as vinyl chloride, wherein a solid, monomer-soluble, free-radical forming compound is used as initiator. The initiator is added to the polymerization system in the form of an aqueous dispersion which contains an ethoxylatcd nonionic emulsifier with an HLB-value above 15, and preferably above 17, which emulsifier does not contain cyclic inner ether bonds. Polymerizates produced according to the method have good electric insulation properties. Suitable ethoxylated nonionic emulsifiers are ethoxylated fatty acids and ethoxylated fatty alcohols. An aqueous dispersion, suitable for polymerization of ethyleni- cally unsaturated monomers, consists of a free- radical forming compound containing a nonionic ethoxylated emulsifier with an HLB-value above 15, in an amount of at least 1 per cent by weight, based on the initiator, and preferably also a protective colloid such as polyvinyl alcohol. The dispersion has good stability and is easy to handle.

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