Carboxylated ethylene copolymers - made by copolymerising olefines with fumaric acid in presence of ethylene-vinyl acetate copolymer

摘要

(A) 0.1-30 Pts. fumaric acid, and (B) 1-20 pts. olefine are copolymerised in presence of (C) 50-99 pts. EVA copolymer with vinyl acetate content of 3-70 wt % and melt index, of 0.1-500 g/10 mins. and (D) a radical initiator. Also present may be (E) 0.1-10 pts. a beta-unsatd. carboxylic acid, pref. mono-carboxylic. Polymerisation is at 20-200 degrees C and (C) is dissolved in a monomer or an aromatic, aliphatic or chlorinated hydrocarbon. The copolymers are used as adhesive, coating or moulding materials, and have excellent adhesive properties and good thermal stability. The graft copolymer prods. have trans-configuration, which makes cyclisation withelimination of water on heating, as occurs with prods. using a, beta-unsat. dicarboxylic acids, e.g. maleic acid, very difficult. Bonding to metals, e.g. Fe or Al is excellent.