Appeal No. 96-1142
Application 07/939,180
(page 2). The coating mixtures “can be used both as base coat
or adhesion coat and as finishing or cover coat” (page 11).
Hombach discloses a polyisocyanate composition which is
dispersible in water, has an average NCO functionality of
about 2.0 to 3.5, and contains 1) an aliphatic polyisocyanate
or a mixture of aliphatic polyisocyanates, and 2) a quantity
of emulsifier sufficient to ensure the dispersibility of the
polyisocyanates (col. 2, lines 13-19). Aqueous dispersions
formed by adding the polyisocyanates to aqueous adhesives are
useful for bonding a number of materials including plastics
(col. 6, lines 25-34). Hombach states that “[t]he
polyisocyanate preparations are particularly suitable for
modifying aqueous adhesives having a solids content of about
10 to 65% by weight, preferably about 20 to 60% by weight,
such as natural latex, aqueous dispersions of homo or
copolymers of olefinically unsaturated monomers and the known
aqueous polyurethane dispersions” (col. 5, lines 19-25). The
polyisocyanates provide improved heat resistance and water
resistance and, relative to aromatic polyisocyanates, added
pot life (col. 6, lines 35-41).
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Last modified: November 3, 2007