Method for the preparation of a polyvinyl chloride resin powder

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

1991-02-07

1992-07-21

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526216, C08F 220, C08F 218

Patent

active

051323826

ABSTRACT:
An improvement is proposed for decreasing triboelectric static charging of a polyvinyl chloride resin powder so as to improve the flowability of the powder and prevent a decrease in the bulk density of the powder due to static electricity. The improvement comprises, in the polymerization process of vinyl chloride monomer in an aqueous medium, adding, to the aqueous polymerization mixture, a specified amount of an aqueous dispersion containing a salt of a long-chain carboxylic acid with a divalent metal and an ester of sorbitan with a long-chain carboxylic acid in a specified weight proportion and in a specified total concentration at a moment when conversion of the monomer to polymer is at least 70%.

REFERENCES:
patent: 3706722 (1972-12-01), Nelson

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