Appeal No. 1997-3563 Page 2
Application No. 08/321,460
was formed by complexing tin or bismuth catalysts with excess
mercapto compound; (3) admixing those components to form a
curable composition; (4) applying the curable composition to a
bondline intermediate adherends; and (5) bonding the adherends
by heating the curable composition above a threshold
temperature.
According to appellants (specification, page 2),
employing the particular catalyst combination as used in their
claimed process results in long open and fast cure times.
Exemplary claim 33 is reproduced below.
33. A method for bonding a pair of adherends with a
curable adhesive composition, which comprises the steps of:
(A) providing an isocyanate component;
(B) providing a catalyzed component comprising:
(1) a hydroxyl functional component;
(2) a heat-activatable amine or aza
catalyst which is activatable at
temperatures above a threshold temperature
of about 65°C, said heat activatable amine
or aza catalyst selected from the group
consisting of; 1,8-
diazabicyclo(5,4,0)undecene-7; 1,5-
diazabicyclo(5,4,0)undec-5-ene; derivatives
and mixtures thereof; and
(3) an activatable complexed metal catalyst
comprising the reaction product of a metal
catalyst selected from the group consisting
of tin catalysts, bismuth catalysts, and
mixtures thereof, and a molar excess of a
mercapto compound complexing agent;
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