Appeal No. 95-0442
Application 08/026,183
to about 3500 (col. 2, lines 36-38), and the carboxyl group-
containing butadiene-acrylonitrile rubber preferably is carboxyl
terminated (col. 2, lines 50-52). The rubber-modified epoxy
resin generally has an epoxy equivalent of 200 to 5000,
preferably 250-4000 (col. 3, lines 38-41), and the rubber
component is about 5-35 wt% of this resin (col. 3, lines 9-10).
The disclosed curing agents include dicyandiamide type curing
agents, hydrazide type curing agents, and imidazole type curing
agents (col. 4, lines 25-31). The composition can include, in
combination with the rubber-modified epoxy resin, an epoxy resin
which can be any epoxy resin which is useful for making the
rubber-modified epoxy resin (col. 3, lines 3-10). The
composition also can include various additives, including a
filler such as silica, depending upon the intended use and
desired properties of the composition (col. 5, lines 8-19).
Appellants argue that there is no teaching in Yamamoto which
would have motivated one of ordinary skill in the art to delete
the organic solvent, metal powder and phenoxy resin from
Yamamoto’s composition (brief, pages 6 and 8-10). We do not
consider this argument to be well taken as to the organic solvent
and metal powder components.
Yamamoto teaches that it was known in the art to use epoxy
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