Appeal No. 95-0442
Application 08/026,183
application. Claim 1 is illustrative and reads as follows:
1. A powder coating composition having good penetrability
and suitability for impregnation of rotor coil windings, said
composition consisting essentially of:
(a) 100 parts by weight of a mixed epoxy resin having an
epoxy equivalent of 800-2000 and including (a-1) diglycidyl ether
of bisphenol A having an epoxy equivalent of 180-2500 and (a-2) a
rubber-modified epoxy resin having an epoxy equivalent of 180-
2500 and obtained by reaction of a diglycidyl ether of bisphenol
A with a carboxyl terminated acrylonitrile-butadiene copolymer,
wherein said copolymer is 1-4 wt.% of said mixed epoxy resin;
(b) a mixed curing agent consisting of (b-1) 0.05-5 parts
by weight of an imidazole compound, (b-2) 0.5-10 parts by weight
of dicyanodiamide and (b-3) 1-10 parts by weight of a dihydrazide
of a dibasic carboxylic acid; and
(c) 50-100 parts by weight of silica.
THE REFERENCES
Kaufman 4,420,605 Dec. 13, 1983
Yamamoto et al. (Yamamoto) 4,695,598 Sept. 22, 1987
THE REJECTION
Claims 1 and 3-5 stand rejected under 35 U.S.C. § 103 as
being unpatentable over Yamamoto in view of Kaufman.
OPINION
We have carefully considered all of the arguments advanced
by appellants and the examiner and agree with appellants that the
aforementioned rejection is not well founded. Accordingly, this
rejection will be reversed.
Appellants’ invention is a powder coating composition which
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