Appeal No. 1997-3609
Application No. 08/483,349
contact adhesive to a substrate and allowing the contact
adhesive to cure, wherein the improvement lies in the contact
adhesive used. Claim 1 is illustrative and reads as follows:
1. In a method of producing a coated substrate
comprising applying a contact adhesive to a substrate, and
allowing the contact adhesive to cure, the improvement
wherein said contact adhesive is a polyurethane/urea
composition consisting essentially of:
a) a polyisocyanate or polyisocyanate adduct having
a functionality of less than about 4,
b) a polyol blend consisting of
1) about 95 to 100% by weight, based on 100% by
weight of component b), of at least one
polyether polyol having a molecular
weight of from about 1800 to 12000 and an
average functionality of from about 1.5 to
about 4,
and
2) up to about 5% by weight, based on 100%
weight of component b), of at least one chain
extender containing hydroxyl groups, having
a molecular weight of from about 60 to 400 and
an average functionality of from about 1.5 to
about 3,
and
c) at least one polyether having at least two
isocyanate-reactive groups, and a molecular
weight of from about 1800 to about 12,000, wherein
at least 50% of the isocyanate-reactive groups
are primary and/or secondary amino groups,
2
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