Appeal No. 95-1568
Application 08/124,747
The subject matter on appeal is directed to a flurosilicone rubber
composition useful in forming moldings.
All the claims stand or fall together (Brief, page 2).
Claim 1 is illustrative and reads as follows:
1. A fluorosilicone rubber composition, comprising:
(A) 100 weight parts of a 3,3,3-trifluoropropylmethylsiloxane-methylvinylsiloxane
copolymer gum having a concentration of methylvinylsiloxane unit in a range of about
0.001 to 5 mole percent,
(B) 30 to 200 weight parts of a dimethylsiloxane-methylvinyl siloxane copolymer gum
having a concentration of methylvinylsiloxane unit in a range of about 0.001 to 5 mole
percent,
(C) 0.5 to 20 weight parts of a poly(3,3,3-trifluoropropylmethyl siloxane-
polydimethylsiloxane block copolymer,
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(D) a reinforcing silica micropowder having a surface area of at least 50m /g, in an
amount of 10 to 100 weight parts per 100 weight parts of the total of components (A),
(B), and (C), and
(E) a curing agent in a quantity sufficient to cure the composition.
The references relied upon by the examiner are:
Evans et al. (Evans ‘774) 4,529,774 Jul. 16, 1985
Evans et al. (Evans ‘811) 4,960,811 Oct. 2, 1990
Claims 1-20 stand rejected under 35 U.S.C.§ 103 as unpatentable over
Evans ‘811 in view of Evans ‘744 incorporated by reference. We reverse.
The claims are directed to a five component mixture, (A)-(E) of specific
named ingredients. Appellants indicate that copolymer gums (A) and (B) are well
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