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
2006-01-31
2006-01-31
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C526S247000, C526S250000, C526S254000, C524S279000
Reexamination Certificate
active
06992143
ABSTRACT:
A non-black filled perfluoroelastomer composition comprising a) a perfluoroelastomer having nitrile group cure sites, b) a curative selected from the group consisting of i) a bis(aminophenol) and ii) a compound that decomposes at curing temperatures to generate ammonia and c) 1–25 phr hydrophobic silica filler. Cured compositions have surprisingly better compression set than do similar compounds containing hydrophilic silica.
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DuPont Dow Elastomers LLC
Hu Henry S.
Wu David W.
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