Process for suspension polymerization of vinyl chloride with mol

Details Process for suspension polymerization of vinyl chloride with mol Process for suspension polymerization of vinyl chloride with mol

1975-08-25

1978-06-06

Henderson, Jr., Christopher A.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526235, 5263442, C08F 428, C08F 220

Patent

active

040937917

ABSTRACT:
An improvement in the suspension polymerization of a polymerizate containing at least 90% polyvinyl chloride by the steps of mixing monomers selected from the group consisting of vinyl chloride and mixtures of vinyl chloride with up to 10% of olefinically unsaturated compounds copolymerizable with vinyl chloride, with water in the presence of a polymerization catalyst and suspension stabilizers, heating said mixture under continuous agitation to polymerization temperatures and recovering said polymerizate. The improvement comprises utilizing a gas containing molecular oxygen as the sole catalyst or catalyst-forming substance. The so-prepared polymerizate forms sheets with a lower content of "fish eyes" and a greater heat stability.

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patent: 3205204 (1965-09-01), Heckmaier
patent: 3375238 (1968-03-01), Bauer
Chem. Abst., 42, 4392h (Prat, Jean, Polym. of Vinyl Chloride).
Chem. Abst., 54, 253i (Lederer, M., Vinyl Chloride Peroxide).
D'Alelio, G. F. Fundamental Principles of Polymerization, Wiley & Sons, Inc. (N.Y.), 1952, pp. 205-207.
Uno, T., Study on Polymerization of Vinyl Chloride, in Kobunshi Kagaku, vol. 14, 1957, pp. 345-352.

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