Alkyl methacrylate / alkyl acrylate copolymers used as sizing agents for reinforcing fibers

摘要

Reinforcing fiber for use in thermoplastic or thermosetting matrix resin are sized with one or more copolymer composition(s) obtainable by reacting: a) 5-90 pphwm of at least one alkyl methacrylate having a Tg of more than 40° C.; and b) 5-50 pphwm of at least one alkyl acrylate having a Tg of less than 0° C.; and c) 0.1-20 pphwm of at least one C3-C6 unsaturated carboxylic acid; and d) at least one further comonomer selected from the group comprising: (i) 5-50 pphwm of at least one vinyl ester of neoalkanoic acid, and (ii) 10-60 pphwm of at least one vinyl ester of -monosubstituted fatty acids, and (iii) 5-50 pphwm of vinyl esters of an aromatic carboxylic acid, and (iv) other comonomers.