Ethylene-alpha-olefin-polyene random copolymer rubber
First Claim
1. Ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms, and a polyene, wherein:
- (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5;
(B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1;
(C) an iodine value of the copolymer rubber is 2 to 40;
(D) an intrinsic viscosity [η
] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135°
C.; and
(E) g.sub.η
* defined by a ratio of the intrinsic viscosity [η
] to an intrinsic viscosity [η
]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.
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Accused Products
Abstract
An ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms and a polyene, wherein (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5, (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1, (C) an iodine value of the copolymer rubber is 2 to 40, (D) an intrinsic viscosity [η] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135° C., and (E) g.sub.η * defined by a ratio of the intrinsic viscosity [η] to an intrinsic viscosity [η]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.9. Also a process for preparing this random copolymer rubber and vulcanizate derived from the same are also disclosed. This random copolymer rubber has an excellent extrudability and a fast cure rate and provides a vulcanizate having high tensile strength.
63 Citations
7 Claims
-
1. Ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms, and a polyene, wherein:
-
(A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5; (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1; (C) an iodine value of the copolymer rubber is 2 to 40; (D) an intrinsic viscosity [η
] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135°
C.; and(E) g.sub.η
* defined by a ratio of the intrinsic viscosity [η
] to an intrinsic viscosity [η
]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8. - View Dependent Claims (2, 4, 5, 6, 7)
-
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3. Vulcanizate of ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms and a polyene, wherein:
-
(A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5; (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1; (C) an iodine value of the copolymer rubber is 2 to 40; (D) an intrinsic viscosity [η
] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135°
C.; and(E) g.sub.η
* defined by a ratio of the intrinsic viscosity [η
] to an intrinsic viscosity [η
]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.
-
Specification