Appeal No. 95-5080
Application 07/952,122
The claims are directed to an epoxy resin composition
comprising at least one liquid epoxy resin, an anhydride hardener
for the resin, a toughener and certain compounds containing two
active hydrogen atoms; a cured product and a process for
improving the toughness of epoxy resins. Claim 1, the only
independent claim, is illustrative of the appealed claims and
reads as follows:
1. An epoxy resin composition which comprises
a) at least one epoxy resin containing on average more
than one 1,2-epoxy group per molecule, which is liquid
and of low viscosity,
b) an anhydride hardener for the epoxy resin a),
c) a toughener, and
d) a hydroxycarboxylic acid, a dicarboxylic acid, a
disecondary amine, a primary amine or a biphenol, which
is a mononuclear diphenol, dihydroxy naphthaline,
dihydroxy biphenyl or another binuclear aromatic
compound which has a methylene, isopropylidene, O, SO
2
or S bridge and contains two hydroxyl groups bound to
the aromatic nuclei and wherein the benzene rings may
also contain halogen atoms.
Appellants indicate that claims 1-4, 6-13 and 15-21 are
to viewed as a single set of claims with respect to the issues on
appeal (Brief, page 3). Hence, all of the claims stand or fall
together. 37 CFR § 1.192(c)(7)(1995). Accordingly, we will
limit our consideration to claim 1 in considering the rejection
of claims 1-4, 6-13 and 15-21.
2
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