Patent ID: 6635727
Filing Date: 2003-10-21
Classification: C08F,C08L

Abstract:
An ethylenic copolymer rubber comprising a random copolymer comprising structural units derived from comonomers, respectively, of(a) ethylene, (b) one or more &agr;-olefins having 3-20 carbon atoms, (c) one or more trienes represented by the formula (1), â€ƒin which R1 and R2 denote each, independently of each other, hydrogen atom, methyl or ethyl and R3 and R4 denote each, independently of each other, methyl or ethyl, and (d) one or more non-conjugated polyenes having in the molecule at least two polymerizable double bonds, wherein the copolymer rubber has characteristic features that the mole ratio of the structural unit derived from ethylene (a) versus the structural unit derived from the &agr;-olefin(s) having 3-20 carbon atoms (b), i.e. ethylene/&agr;-olefin(s), is in the range from 95/5 to 40/60, that the content of the structural unit derived from the triene(s) (c) is in the range from 0.1 to 10 mole %, that the content of the structural unit derived from the non-conjugated polyene(s) (d) is in the range from 0.02 to 3 mole % and that the intrinsic viscosity (&eegr;) determined in decalin at 135Â° C. is in the range from 0.1 to 10 dl/g.