Modification of vinylchloride polymers

Details Modification of vinylchloride polymers Modification of vinylchloride polymers

C - Chemistry, Metallurgy

08

L

400/3056

C08L 27/06 (2006.01) C08L 51/04 (2006.01) C08L 55/02 (2006.01)

Patent

CA 1088246

MODIFICATION OF VINYLCHLORIDE POLYMERS Abstract of the Disclosure A rubbery-elastic graft copolymer of 40 to 70 parts by weight of a monomer mixture of 40 to 60 parts by weight of sty- rene, 40 to 60 parts by weight of methylmethacrylate and 0 to 10 parts by weight of acrylonitrile on from 60 to 30 parts by weight of a copolymer of 70 to 90 parts by weight of butadiene, 10 to 30 parts by weight of styrene, 0 to 10 parts by weight of acrylonitrile and 0 to 2 parts by weight of a cross-linking monomer having an average particle size of from 0.05 to 0.5 µm is prepared by emulsion polymerisation of the monomer mixture in the presence of the copolymer in the form of a latex with the aid of a catalyst system consisting of a peroxydisulphate and an alkanolamine and of an emulsifier which is active at a pH value above 7, followed by isolation of the graft copolymer from the latex by precipitation with an electrolyte at pH va- lues below 7 and mixed with a vinylchloride polymer to improve impact strength thereof with retention of transparency.

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