Vinyl chloride polymers

Details Vinyl chloride polymers Vinyl chloride polymers

C - Chemistry, Metallurgy

08

F

400/6535, 400/65

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

Patent

CA 1254327

22772-1007 ABSTRACT The invention relates to a process for preparing vinyl chloride polymers by suspension polymerization in a polymerization reactor of vinyl chloride, optionally in combination with at most 30 % (wt) of one or more monomers copolymerizable therewith, with monomer - soluble, radi- cal - forming initiators and possibly in the presence of primary suspending agents. The improvement comprises the addition of an aqueous dispersion of at least one polyvinyl ester with a degree of solvolysis in respect of the dry substance lower than 25 moles % to the polymerize- tion reactor before or during said polymerization, which polyvinyl ester is chosen from the polymeric vinyl esters of aliphatic and/or aromatic carboxylic acids, the amount of the aqueous dispersion supplied being such that after this addition the reaction mixture contains 0.01-0.5 part by weight of the polyvinyl ester per 100 parts by weight of the starting monomer.

452764

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