Process for the production of acrylonitrile-vinyl-chloride copol

Details Process for the production of acrylonitrile-vinyl-chloride copol Process for the production of acrylonitrile-vinyl-chloride copol

1976-12-13

1978-10-03

Lilling, Herbert J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

260881, 5262295, 526342, 526915, C08F22044, C08F 440

Patent

active

041185560

ABSTRACT:
The invention relates to a process for the production of chemically uniform acrylonitrile-vinyl chloride copolymers with improved whiteness and improved thermal stability comprising from 25 to 60% by weight of acrylonitrile and from 40 to 75% by weight of vinyl chloride and, optionally, up to 15% by weight of other copolymerized ethylenically unsaturated compounds by emulsion polymerization using a redox catalyst of persulphate and compounds of sulphurous acid, wherein the ratio by weight of reducing component to oxidizing component is at least 4 : 1 and wherein polymerization is carried out at a pH-value in the range of from 2.5 to 4.

REFERENCES:
patent: 2992209 (1961-07-01), Webb et al.
patent: 3002956 (1961-10-01), Perri
patent: 3053806 (1962-09-01), LaCombe et al.
patent: 3123588 (1964-03-01), Lunney
patent: 3202641 (1965-08-01), Nakajima et al.

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