Polymerization of vinyl chloride

Details Polymerization of vinyl chloride Polymerization of vinyl chloride

1972-02-15

1977-01-25

Kight, III, John

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

Synthetic resins

Effecting a change in a polymerization process in response...

526 61, 526 86, 526 88, 526227, 526344, 526345, 526909, C08F 1406

Patent

active

040052494

ABSTRACT:
Homopolymers and copolymers of vinyl chloride are produced in the form of a powder by a bulk polymerization process which involves a dual temperature operation. Vinyl chloride (either alone or admixed with other copolymerizable monomers) is contacted with conventional polymerization initiators in the absence of solvents or diluents at a first temperature of from about 68.degree. to about 110.degree. F until the polymerization has proceeded to 0.1 to 10% of completion and thereafter the temperature is raised to 120.degree. to 150.degree. F until the polymerization has reached the desired conversion.

REFERENCES:
patent: 3033839 (1962-05-01), Heckmaier
patent: 3473896 (1969-10-01), Halder
patent: 3480606 (1969-11-01), Thomas
patent: 3522227 (1970-07-01), Thomas
patent: 3544280 (1970-12-01), Thomas
patent: 3558584 (1971-01-01), Thomas
patent: 3681308 (1972-08-01), Irvin
patent: 3683051 (1972-08-01), Chatelain
patent: 3687923 (1972-08-01), Thomas
patent: R25763 (1962-02-01), Marous
Hydrocarbon Processing, Nov. '68, vol. 47, No. 11, pp. 192-196, New Improved Bulk PVC Process, by Thomas, Jean-Claude.

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