Process for suspension polymerization of vinyl chloride employin

Details Process for suspension polymerization of vinyl chloride employin Process for suspension polymerization of vinyl chloride employin

1978-11-13

1982-08-17

Henderson, C. A.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526201, 526202, C08F 220

Patent

active

043450563

ABSTRACT:
An improvement in the process of producing polyvinyl chloride by the suspension process in the presence of protective colloids by utilizing a protective colloid mixture of from 20% to 80% of the protective colloid mixture of a polyvinyl acetate having a hydrolysis degree of 40 to 55 mol % and the remainder of the protective colloid mixture of (1) a water-soluble polyvinyl alcohol having a hydrolysis degree of 70 to 90 mol %, or (2) an aminoethyl-hydroxypropyl cellulose having a molar substitution of from 0.05 to 1.5 mols of aminoethyl groups and 3 to 5 mols of hydroxypropyl groups, or (3) a vinyl acetate/vinyl pyrrolidone copolymer having a ratio of vinyl pyrrolidone to vinyl acetate in the copolymer of 50% to 70% by weight to 30% to 50% by weight and a K-value of 25 to 40. By the use of this protective colloid mixture, the polyvinyl chloride produced exhibits a large absorption of plasticizer and gives finished products having a low number of specks.

REFERENCES:
patent: 3172877 (1965-03-01), Fishbein
patent: 3592800 (1971-07-01), Oschmann
patent: 3817959 (1974-06-01), Balwe
patent: 3817963 (1974-06-01), Balwe
patent: 3929753 (1975-12-01), Itoh

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