Appeal No. 1998-1737
Application No. 08/318,702
one or more polyurethane prepolymers consisting of polyols
and/or polyamines and encapsulated polyisocyanates; or
one or more polyurethane prepolymers with radically
polymerizable groups;
wherein the adhesive strip at ambient temperature is solid
and does not deform when handled; has an activation temperature
of 70°C to 180°C, and has a softening point at temperature of
25°C to 80°C wherein the adhesive strip is tacky and non-flowing
and plastically deformable for a time sufficient for assembly and
the modular component can be stored for 1 to 3 months.
57. Latently reactive polyurethane adhesive which comprises:
one or more polyurethanes with blocked or free isocyanate
groups;
one or more polyurethane preproducts consisting of polyols
and/or polyamines and encapsulated polyisocyanates; or
one or more polyurethanes with radically polymerizable
groups;
wherein up to about 20 weight percent of the polyols used to
prepare the polyurethanes are solid crystallizing polyester
polyols which in the adhesive display a melting point of 35°C to
80°C while the remainder of the polyols are polyether polyols.
The examiner relies upon the following references as
evidence of obviousness:
Hoeschele 3,933,759 Jan. 20, 1976
Hung 5,063,269 Nov. 05, 1991
Münzmay et al. (Münzmay) 5,100,995 Mar. 31, 1992
Backus et al., "Polyurethanes," 13 Encyclopedia of Polymer
Science and Engineering 243-303
Appellants' claimed invention is directed to a storable
modular component comprising a strip of a latently reactive
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