Nicht vergilbende Copolymerisate aus Butadien und/oder Nitrilen copolymerisierbarer Carbonsaeuren sowie weiteren Comonomeren

摘要

1,260,354. Butadiene and/or nitrile copolymers resistant to yellowing. BADISCHE ANILIN- & SODA-FABRIK A.G. 5 June, 1969 [6 June, 1968], No. 28521/69. Heading C3P. Copolymers which are resistant to yellowing are prepared by subjecting to free radical polymerization a monomer mixture comprising (a) from 95-5% by weight of butadiene and/or a nitrile of an addition polymerizable carboxylic acid, (b) from 5-95% by weight of at least one other addition polymerizable monomer, and (c) from 2À5-50 p.p.m. (based on (a) and (b)) of a compound which absorbs light in the wavelength range of from 570-605 mÁ and bears at least one addition copolymerizable group. Suitable as nitriles (a) are the nitriles of crotonic, methylenemalonic, acrylic or methacrylic acid. Monomers (b) include styrene, vinyl chloride, vinylidene chloride, alkyl esters of acrylic, methacrylic or maleic acid, vinyl alkanoates, N-vinylpyrrolidone, N-vinylcaprolactam, vinylimidazole, acrylic, methacrylic or maleic acid and anhydrides and amides thereof, hydroxyalkyl acrylates, glycidyl acrylate, and N - methylol- and N - alkoxy - methyl derivatives of acrylamide, methacrylamide, N- acryloylurea, acryloylglyoxalmonoureine and N- acryloylglyoxaldiureine. Monomer component (c) is suitably a blue to violet dye of the azo or anthraquinone series containing one or more acrylic ester or acrylamido groups. Polymerization may be effected by bulk, solution, precipitation or, preferably, emulsion methods. Potassium persulphate is exemplified as catalyst in emulsion polymerizations, and butyl acetate is exemplified as diluent (catalyst not specified) in non-aqueous polymerizations. The copolymers obtained can be used to form films, coatings and laminations.