Random ethylene/alkyl acrylate copolymers, compounds and...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

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C526S318000, C526S348000

Reexamination Certificate

active

07153918

ABSTRACT:
Disclosed are random copolymers derived from ethylene and at least two different alkyl acrylate comonomers, with or without an acid cure site-containing comonomer. In particular, disclosed are copolymers derived from copolymerization of (a) from 10 to 50 weight % of ethylene; (b) from 5 to 55 weight % of a first alkyl acrylate; (b) from 15 to 80 weight % of a second alkyl acrylate; and (d) from 0 to 7 weight % of a monoalkyl ester of 1,4-butene-dioic acid. Such copolymers exhibit lower glass transition temperatures (Tg) relative to previous ethylene copolymers comprising a single alkyl acrylate comonomer and maintain the good heat and fluid resistance when employed to produce cured elastomeric compositions as well as the improved low temperature properties. This invention also provides compounded compositions comprising these copolymers, and cured compositions (i.e., vulcanizates) as well as rubber articles formed from these compounded compositions, such as hoses, dampers, seals, gaskets, constant velocity joint (CVJ) boots and shaft boots.

REFERENCES:
patent: 3873494 (1975-03-01), Lewis
patent: 3883472 (1975-05-01), Greene et al.
patent: 3904588 (1975-09-01), Greene et al.
patent: 4275180 (1981-06-01), Clarke
patent: 5194516 (1993-03-01), Fisher et al.
patent: 5498669 (1996-03-01), Williams
patent: 6136920 (2000-10-01), Hert et al.
patent: 99-343378 (1999-12-01), None
patent: 2000-44757 (2000-02-01), None

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