Appeal No. 1997-1991 Page 5
Application No. 08/376,270
material and a method of preparing the composition. The
composition is a product of the reaction of:3
(a) a water-dispersible isocyanate-terminated
polyurethane prepolymer having an NCO content of 2.1
to 10% percent by weight,
(b) an organic polyisocyanate having an average
isocyanate functionality of 2.1 to 4.0, and
(c) an active hydrogen-containing chain extender.
The chain extender of Coogan may comprise an amine
(column 5, line 60 through column 7, line 40). The prepolymer
reactant of Coogan is disclosed as being made from an organic
diisocyanate, a polyol having a specified molecular weight
range and a specified compound having a hydrophillic center
(column 2, lines 12-19). Coogan (column 2, lines 31-35)
further teaches that mixtures of polyisocyanates may be used
and a variety of modified polyisocyanates that have “...
urethane, allophanate, urea, biuret, carbodiimide, uretonimine
or isocyanurate residues” introduced therein are useful in
making the prepolymer.
The examiner takes the position that Mosbach discloses
“reaction products of dimer/trimer mixtures of hexane
diisocyanate and isophorone diisocyanate (col. 3, lines 8-10)
3Coogan, column 2, lines 6-11.
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