Ethylene-alpha-olefin-polyene random copolymer rubber
US4510303A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1983 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | May 6, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 [.eta.] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135.degree. C., and (E) g.sub..eta. * defined by a ratio of the intrinsic viscosity [.eta.] to an intrinsic viscosity [.eta.]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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.