Process for reducing content of free vinyl chloride by posttreat

Details Process for reducing content of free vinyl chloride by posttreat Process for reducing content of free vinyl chloride by posttreat

1977-12-07

1980-05-27

Henderson, C. A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

260 296PT, 526 93, 526200, 526209, 526216, 526225, 526264, 526287, 526304, 526317, 526318, 526320, 526323, 526329, 526330, 526331, 528501, 528503, C08F 624, C08F 616

Patent

active

042051614

ABSTRACT:
A process for the manufacture of vinyl chloride copolymers having a reduced content of free vinyl chloride comprising polymerizing a monomer mixture containing from 15% to 90% by weight of vinyl chloride under aqueous emulsion polymerization conditions with conventional post-polymerization, releasing the pressure, flushing the gas space above the copolymer dispersion free of monomer, cooling the copolymer dispersion to a temperature of from 10.degree. to 40.degree. C., adding a redox catalyst to the cooled dispersion consisting of from 0.002% to 0.5% by weight of the dispersion of an oil-soluble peroxy compound, and a water-soluble sulfur-containing reducing agent in a ratio of reducing agent to peroxy compound of 0.5 to 3 equivalents, allowing the dispersion to stand at a temperature of from 10.degree. to 40.degree. C. for a period of two hours to two days and recovering a copolymer dispersion having a vinyl chloride content of less than 50 ppm.

REFERENCES:
patent: 3692726 (1972-09-01), Oehmichen
patent: 4015065 (1977-03-01), Park

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