C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/397, 402/546
C08F 14/06 (2006.01) C08F 2/20 (2006.01)
Patent
CA 1089597
ABSTRACT OF THE DISCLOSURE 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 of a polyvinyl acetate having a hydrolysis degree of 40 to 55 mol % and the remainder of the protective colloid 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 substitu- tion 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 K-value of 25 to 40. By the use of this protective colloid mixture, the polyvinyl chloride pro- duced exhibits a large absorption of plasticizer and gives finished products having a low number of specks. -?-
279915
Balwe Thomas
Bauer Johann
Beier Gerhard
Thyret Helmut E.
Macrae & Co.
Wacker-Chemie Gmbh
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