Method for the preparation of a polyvinyl chloride resin

Details Method for the preparation of a polyvinyl chloride resin Method for the preparation of a polyvinyl chloride resin

C - Chemistry, Metallurgy

08

F

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

Patent

CA 2067017

-25- ABSTRACT OF THE DISCLOSURE An improved method for the suspension polymerization is proposed which gives a PVC resin product having an increased plasticizer absorptivity and greatly decreased content of fish eyes. The invention can be achieved by additionally adding a limited volume of water into the polymerization mixture under proceeding of the polymerization reaction within a specified period of 30 to 70% monomer conversion and at such a controlled rate as not to unduly decrease the pressure inside of the reactor. The improve- ments are particularly remarkable when the dispersing agent ad- ded to the polymerization mixture is a ternary combination of (A) a water-soluble partially saponified polyvinyl alcohol of a high de- gree of polymerization and a high degree of saponification, (B) a hydroxypropyl methyl cellulose having specified degrees of substi- tution with methoxy and hydroxypropoxy groups and specified vis- cosity characteristics and (C) a monomer-soluble partially saponi- fied polyvinyl alcohol of a low degree of polymerization and a low degree of saponification, each in a specified amount.

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