Patent ID: 6458894
Filing Date: 2002-10-01
Classification: C08L

Abstract:
A rubber modifier to be blended with a rubber for improving workability, comprising an ethylene/&agr;-olefin copolymer rubber (A) comprising:(a) 60-90% by weight of an ethylene/&agr;-olefin copolymer rubber (A1) comprising 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, wherein said ethylene/&agr;-olefin copolymer rubber (A1) has the parameters of (i) an ethylene/&agr;-olefin mole ratio in the range of 50/50 to 85/15, and (ii) an intrinsic viscosity (&eegr;) determined in decahydronaphthalene at 135Â° C. in the range of 0.2 to 0.9 dl/g; and (b) 10-40% by weight of an ethylene/&agr;-olefin copolymer rubber (A2) comprising 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, wherein said ethylene/&agr;-olefin copolymer rubber (A2) has the parameters of (i) an ethylene/&agr;-olefin mole ratio in the range of 60/40 to 90/10, and (ii) an intrinsic viscosity (&eegr;) determined in decahydronaphthalene at 135Â° C. in the range of 3 to 6 dl/g; 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 3.