Appeal No. 2001-0857 Page 5
Application No. 09/012,166
polyols and lower molecular weight chain-extending agents or
crosslinking agents. See column 3, lines 29 through 40.
When preparing the product according to the invention
of Liebl, the polyurethane single component systems are
preferably mixed with steam and sprayed on to a substrate.
Moreover, in addition to comprising a prepolymer, the system
comprises at least one latent hardener selected from the
group consisting of oxazolidine, enamine, and azomethines
and preferably ketimines and/or most preferably aldimines.
See column 6, lines 36 through 44.
As pointed out by appellants, the polyurethane systems
are widely used as coatings and in the preparation of
elastic floor coverings. See column 1, lines 6 through 10.
One of the objects of Liebl is to quickly and reliably
prepare polyurethane single component systems as coatings
without having a polyurethane mass run off of vertical
surfaces, rear sections or sharp corners before curing or
without having a polyurethane mass form undesirable
droplets. See column 2, lines 17 through 24.
On the other hand, De Santis concerns a polyurethane
sealant-primer system comprising an isocyanate-reactive
surface primer compositions and a moisture-curable
polyurethane sealant composition. See column 1, lines 13
through 20.
De Santis indicates that although the sealants of the
invention can be directly applied and will adhere to certain
surfaces, priming a surface with an isocyanate-reactive
material, gives the best adherence, as well as improving
other properties of the bond formed. This is particularly
true if the sealants of the invention are employed on glass,
when, for example, the composition is employed as a
windshield sealant. See column 4, lines 65-75. Priming
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