Appeal No. 95-0442
Application 08/026,183
is suitable for impregnating rotor coil windings. The
composition consists essentially of 1) 100 parts by weight of a
mixed epoxy resin which has an epoxy equivalent of 800-2000 and
includes a) a diglycidyl ether of bisphenol A having an epoxy
equivalent of 180-2500, and b) a rubber-modified epoxy resin
which has an epoxy equivalent of 180-2500 and is obtained by
reacting a diglycidyl ether of bisphenol A with a carboxyl-
terminated acrylonitrile-butadiene copolymer, this copolymer
being 1-4 wt% of the mixed epoxy resin, 2) a mixed curing agent
consisting of specified amounts of an imidazole compound,
dicyanodiamide and a dihydrazide of a dibasic carboxylic acid,
and 3) 50-100 parts by weight of silica.
Yamamoto discloses a coating composition which is especially
suitable for coating fuel tanks (col. 1, lines 5-9), but can be
used to form coatings for various articles in various fields
(col. 5, lines 20-22). The composition comprises a rubber-
modified epoxy resin, a phenoxy resin, a metal powder, a curing
agent and an organic solvent (col. 1, lines 49-55). The rubber-
modified epoxy resin is made by reacting an epoxy resin with a
carboxyl group-containing butadiene-acrylonitrile rubber, wherein
the epoxy resin can be a bisphenol A type epoxy resin (col. 2,
lines 29-32) and generally has an epoxy equivalent of about 100
-3-3
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