Ethylene copolymer - contg units of (meth) acrylic acid, normal alkyl (meth)acrylate and opt t-butyl (meth)acrylate

摘要

Ethylene copolymers contg. 60% wt. ethylene, 1-15% wt. (meth)acrylic acid, and 0.5-20%wt. of an ester of (meth)arcylic acid with a primary 1-12C alcohol and opt. up to 1.0% wt. t-butyl (meth)acrylate are prepd. by (a) polymerising a mixt. of 100pts. wt. ethylene, 0.1-5 pts. wt. of an ester of (meth)acrylic acid with a primary 1-12C alcohol, and 0.3-4.5 pts. wt. t-butyl (meth)acrylate, at 200-270 degrees C and 1000-8000 atm. and a residence time of 40-120 secs. using a catalytic amount of a free radical initiator, and (b) exposing the reaction mixt. for 40-90 secs. to a temp. of 280-320 degrees C. Polymsn. is pref. effected in the presence of 0.2-5% vol. based on ethylene of a polymsn. regulator. Used as adhesives for prodn. of laminates.