Appeal No. 1997-0140
Application No. 08/266,290
1. A storage stable, one-component polyurethane
composition useful as a sealant or coating which cures at
elevated temperature comprising
a) an isocyanate selected from
(1) isocyanate terminated prepolymers formed from a
polyisocyanate and a hydroxyl group containing
compound having at least two hydroxyl groups and
a molecular weight greater than 500 which
prepolymers have been blocked with a phenol or
oxime,
(2) polyisocyanate adducts in which the free
isocyanate groups have been blocked with a phenol
or oxime, and
(3) monomeric isocyanates which have been blocked
with a phenol or oxime;
b) at least one compound selected from the group
consisting of polyketimines having amino groups attached
to secondary carbon atoms, polyenamines and oxazolidines;
and
c) a compound which generates water under the curing
conditions
in which components a), b) and c) are used in amounts such
that the equivalent ratio of a):b):c) is from about 1:0.1:0.3
to about 1:2:2.
The examiner relies upon the following references as
evidence of obviousness:
Akiyama et al. (Akiyama) 5,130,402 Jul. 14, 1992
Markusch et al. (Markusch) 5,142,014 Aug. 25, 1992
Appellants' claimed invention is directed to a one-
component polyurethane composition that finds utility as a
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