Ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber co

Details Ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber co Ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber co

1995-09-22

1997-11-25

Merriam, Andrew E. C.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 89, 525211, 525240, 521140, C08J 906, C08L 2316

Patent

active

056914130

ABSTRACT:
An ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition which comprises two kinds of (A) and (B)!, copolymer (A) containing ethylidenenorbornene and either dicyclopentadiene or .alpha.,.omega.-diene having 8 to 20 carbon atoms in the main chain as the non-conjugated dienes, copolymer (B) containing ethylidenenorbornene as the non-conjugated diene, the weight ratio of the copolymer (A) to the copolymer (B) being 30/70 to 70/30, wherein the copolymer (A) has a relatively low molecular weight, a specific ethylene/.alpha.-olefin weight ratio and a specific non-conjugated diene content and the copolymer (B) has a relatively high molecular weight and a specific ethylene/.alpha.-olefin weight ratio. Said copolymer rubber composition, when highly foamed, shows no reduction particularly in low tensile stress, and is excellent in shape-retention during cross-linking and foaming, and in compression set and processibility.

REFERENCES:
patent: 4722971 (1988-02-01), Datta et al.
patent: 4833194 (1989-05-01), Kuan et al.
patent: 4866100 (1989-09-01), Iwasa et al.
patent: 5093381 (1992-03-01), Yamamoto et al.
International Rubber Conference, pp. 271-276, 1975, Kiyosha Honma, et al., "EPDM for Cellular Extrusions".

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