Disclosed are copolymers derived from ethylene and an alkyl acrylate
comonomer wherein the copolymer has a number average molecular weight
(M.sub.n) above 40,000. This invention also provides compounded
compositions and cured compositions (i.e., vulcanizates) comprising these
copolymers. The copolymers provide improved dynamic fatigue resistance of
the vulcanizates. Also disclosed are articles comprising the copolymers,
such as tubing, hoses, dampers, seals and gaskets.