Process for the production of acrylonitrile-vinyl chloride...

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

C - Chemistry, Metallurgy

08

F

402/324, 402/407

C08F 4/40 (2006.01) C08F 214/06 (2006.01) C08F 220/44 (2006.01)

Patent

CA 1043941

Abstract of the Disclosure 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 actylonitrile and from 40 to 75 % by weight of vinyl chloride and, optionally, up to 15 % by weight of other copolymerised ethylenically unsaturated compounds by emulsion polymerisation using a redox catalyst of persulphate and compounds of sulphurous acid, wherein the ratio by weight of reducing component to oxidising component is at least 4 : 1 and wherein polymerisation is carried out at a pH-value in the range of from 2.5 to 4.

233817

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