Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-12-14
2010-06-15
Lipman, Bernard (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S329100, C525S329200, C525S329300, C525S372000
Reexamination Certificate
active
07737225
ABSTRACT:
An elastomer composition includes a polymer system made up of a majority of HNBR polymer and an optional polymer additive such as carboxylated nitrile, ethylene-propylene-diene rubber, isoprene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, butyl rubber, isoprene rubber, natural rubber and hydrogenated carboxylated butadiene acrylonitrile terpolymer, and combinations thereof. The polymer system totals 100 parts by weight. A cure system for the elastomer composition includes 1.5 to 30 parts by weight of zinc, magnesium or calcium oxide, 15 to 50 parts by weight of an α,β-ethylenically unsaturated carboxylic acid and an organoperoxide. Under vulcanization conditions, the elastomer composition cures through the in situ formation of a metal carboxylate. A degradation inhibitor for an elastomer composition that includes an amine and an imidazole along with an optional polymerized quinoline is noted to be particularly effective.
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“Peroxide cured HNBR/methacrylate blends with improved low temperature performance” Nick Sandland et al, Rubber World.
Flanagan David P.
Pergantis Charles G.
Teets Alan R.
Touchet Paul
Kyriakou Christos S.
Lipman Bernard
Randolph William W.
The United States of America as represented by the Secretary of
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