Ethylene-alpha-olefin-polyene random copolymer rubber

Details Ethylene-alpha-olefin-polyene random copolymer rubber Ethylene-alpha-olefin-polyene random copolymer rubber

1983-05-06

1985-04-09

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5261692, 5253328, C08F21018

Patent

active

045103038

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.

REFERENCES:
patent: 3554988 (1971-01-01), Emde et al.
patent: 3674754 (1972-07-01), Cameli et al.
patent: 4200722 (1980-04-01), Pennings et al.
patent: 4259468 (1981-03-01), Kajiura et al.

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