Ethylene/alpha-olefin/7-methyl-1,6-octadiene copolymer rubber an

Details Ethylene/alpha-olefin/7-methyl-1,6-octadiene copolymer rubber an Ethylene/alpha-olefin/7-methyl-1,6-octadiene copolymer rubber an

1993-01-21

1994-03-08

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526151, 526160, 525236, 525237, C08F23620, C08L 2316

Patent

active

052928454

ABSTRACT:
The ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber of the invention is a random copolymer rubber prepared using a Group IVB transition metal type catalyst containing a specific zirconium catalyst component, and in this copolymer rubber, a molar ratio of ethylene to .alpha.-olefin, a diene content, an intrinsic viscosity [.eta.], an intensity ratio D of T.alpha..beta. to T.alpha..alpha. in a .sup.13 C-NMR spectrum of said copolymer rubber, a B value which is a measure of distribution of each monomer and a glass transition temperature are all within specific ranges. The rubber composition of the invention comprises the above-mentioned random copolymer rubber and a conjugated diene rubber. The random copolymer rubber has high stereoregularity, narrow composition distribution and excellent low-temperature flexibility, and shows extremely high covulcanizability with the conjugated diene rubber. In addition, this random copolymer rubber is excellent in weathering resistance, ozone resistance and thermal aging resistance.

REFERENCES:
patent: 3250753 (1966-05-01), Kottenhahn
patent: 3291780 (1966-12-01), Gladding et al.
patent: 5229478 (1993-07-01), Floyd et al.
Database WPIL Derwent Publications Ltd., London, GB; AN 92-255715 & JPA 4 173 815 (Mitsui Petrochemical Industries) Jun. 22, 1992.

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