Appeal No. 1996-2703
Application 08/339,637
OPINION
We have carefully considered all of the arguments
advanced by appellants and the examiner and agree with
appellants that the aforementioned rejections are not well
founded. Accordingly, we reverse these rejections.
McKown discloses a curable structural adhesive in
flowable, particulate form which is suitable for adhering
layers to honeycomb cores to make aircraft wing assemblies
(col. 1, lines 15-16 and 32-35). The adhesive includes 1) an
epoxy resin having on average more than one reactive 1,2 epoxy
group per molecule, 2) a reaction product of a second epoxy
resin and a nitrile rubber copolymer derived from 18-46% by
weight of acrylonitrile, 54-82 wt% butadiene, and up to 15 wt%
of a carboxylic acid, the second epoxy resin having on average
more than one reactive 1,2 epoxy group per molecule, and 3) a
curing agent which is stable at room temperature and active at
elevated temperatures, wherein the nitrile rubber copolymer is
less than about 55% of the combined weight of the first and
second epoxy resins and there are enough molecules of the
reaction product having a molecular weight of at least 8000 to
4
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