Copolymer rubber, and foamed article, vulcanized rubber,...

Details Copolymer rubber, and foamed article, vulcanized rubber,... Copolymer rubber, and foamed article, vulcanized rubber,...

2006-02-28

2006-02-28

Teskin, Fred (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S282000, C526S283000, C524S554000, C521S150000, C428S036800

Reexamination Certificate

active

07005492

ABSTRACT:
There is provided an ethylene-α-olefin-non-conjugated diene copolymer rubber satisfying the following requirements (1) to (4):(1) a ratio of a Z-average molecular chain length (Az) measured according to a gel permeation chromatography to a number average molecular chain length (An), Az/An, of the ethylene-α-olefin-non-conjugated diene copolymer rubber is from 20 to 30,(2) a ratio of a weight average molecular chain length (Aw), which is an index of a molecular weight distribution, to the number average molecular chain length (An), Aw/An, of the ethylene-α-olefin-non-conjugated diene copolymer rubber is more than 5,(3) a unimodal or bimodal molecular weight distribution structure having a molecular chain length component, which component is present in a maximum amount in a range of 3.8<Log Aw<4.5, exists in the ethylene-α-olefin-non-conjugated diene copolymer rubber, and(4) a viscosity (ML1+4, 121° C.) of the ethylene-α-olefin-non-conjugated diene copolymer rubber measured with a ML viscometer is more than 60 and less than 160.

REFERENCES:
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patent: 5728766 (1998-03-01), Schauder et al.
patent: 6465584 (2002-10-01), Evens et al.
patent: 6716931 (2004-04-01), Koshiba et al.
patent: 7-508770 (1995-09-01), None
patent: 2002-507228 (2002-03-01), None

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