Moldable copolymer of ethylene and an acrylamide and production thereof.

摘要

There are copolymerized, by weight, a) 40-99% of ethylene and b) 60-1% of a dialkylaminoalkyl acrylamide of the formula <CHEM> where R1 is H or -CH3, R2 and R3 are each C1-4 alkyl and n is 2-4 (e.g. dimethylaminoethyl acrylamide), in a reactor under pressure of 500-3,000 kg/cm<2> and a temperature of 100-300 DEG C in the presence of a radical polymerisation initiator (O2, a peroxide or azo compound) in amount of 5-3,000 parts per million parts of ethylene. Up to 20% of c) another ethylenically unsaturated monomer (e.g. methyl acrylate, vinyl acetate) can also be copolymerised. The resultant copolymer contains the components in proportions of a) 40-95%, b) 60-5% and c) 0-20%, and has a number average molecular weight determined from a GPC chart of 5,000-50,000. The copolymer can be molded directly or 100 parts can be mixed with 1-20 parts of a poly( alpha -olefin) (e.g. polypropylene) to form a spinnable and dyeable mixture, or can be converted by HCl to a quaternary salt, reacted with epichlorohydrin and an alkylolamine to form a stable cationic aqueous dispersion which is coated on a substrate to form a transparent,flexible and tough coating.