Patent ID: 6599984
Filing Date: 2003-07-29
Classification: C08L

Abstract:
A rubber composition comprising a rubber modifier admixed with rubber, wherein said rubber modifier comprises an ethylene/&agr;-olefin copolymer rubber (A) composed of one or more copolymers selected from the group consisting of (1) a copolymer of ethylene and an &agr;-olefin having 3-20 carbon atoms and (2) a copolymer of ethylene, an &agr;-olefin having 3-20 carbon atoms and a non-conjugated polyene;the copolymer rubber (A) comprising: (a) 60-90% by weight of an ethylene/&agr;-olefin copolymer rubber (A1) having the parameters of (i) an ethylene/&agr;-olefin mole ratio in the range of 50/50 to 85/15, (ii) an intrinsic viscosity (&eegr;) determined in decahydronaphthalene at 135Â° C. in the range of 0.2 to 0.9 dl/g, and (iii) an iodine value in the range of 0 to 40; and (b) 10-40% by weight of an ethylene/&agr;-olefin copolymer rubber (A2) having the parameters of (i) an ethylene/&agr;-olefin mole ratio in the range of 60/40 to 90/10, (ii) an intrinsic viscosity (&eegr;) determined in decahydronaphthalene at 135Â° C. in the range of 3.3 to 6 dl/g, and (iii) an iodine value in the range of 0 to 40; the copolymer rubber (A) having the parameters of (i) an ethylene/&agr;-olefin mole ratio in the range of 51/49 to 87/13, (ii) an intrinsic viscosity (&eegr;) determined in decahydronaphthalene at 135Â° C. in the range of 0.8 to 2.5 dl/g and (iii) an iodine value in the range of 0 to 40.