Method for the preparation of a vinyl chloride polymer

Details Method for the preparation of a vinyl chloride polymer Method for the preparation of a vinyl chloride polymer

C - Chemistry, Metallurgy

08

F

C08F 2/20 (2006.01) C08F 14/06 (2006.01) C08L 1/02 (2006.01) C08L 27/06 (2006.01) C08L 29/04 (2006.01)

Patent

CA 2074995

ABSTRACT OF THE DISCLOSURE An improvement is proposed for the suspension polymeriza- tion of vinyl chloride to give a resin powder having an increased bulk density and containing a decreased amount of fish eyes. The improvement can be obtained by using, as the suspending agent, three kinds of water-soluble polymers in combination, of which the first two, which are dissolved in the aqueous suspension medium already at the start of the polymerization eaction, are a specific partially saponified polyvinyl alcohol and a specific hydroxypropyl methyl cellulose and the third polymer, which is introduced into the polymerization mixture ata specified moment during proceed- ing of the polymerization reacion, is also a specific partially sapo- nified polyvinyl alcohol different from the first partially saponified polyvinyl alcohol, each polymer being added in a specified amount.

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