Appeal No. 95-3218
Application No. 08/100,696
Claim 1 is representative and is reproduced below:
1. A solvent free, moisture curable urethane hot melt
adhesive composition having thermal stability that can be
extruded to form an initially high green strength hot melt
bond and can moisture-cure to an adhesive bond, which
composition comprises:
(a) about 5-80 wt-% of a polyester polyether copolymer
comprising a polymer having the formula:
O O
2 2
-C-Nu-C-O-R -
1
wherein Nu is a predominately cyclic nucleus and R is
1
randomly selected from either a C alkylene or an amorphous,
2-6
long-chain polyether subunit comprising a polyoxyalkylene
group; and
(b) about 20-95 wt-% of a polyisocyanate prepolymer
comprising the reaction product of:
(i) a polyol; and
(ii) a polyfunctional isocyanate having an
isocyanate functionality of about two or more wherein said
polyfunctional isocyanate is present in a concentration
sufficient to form said polyisocyanate prepolymer and provide
free isocyanate functionality to cure said adhesive
composition through reaction with moisture.
The reference of record relied upon by the examiner is:
Merton et al. (Merton) 4,430,479 Feb. 7,
1984
A reference relied upon by appellants is:
Encyclopedia of Chemical Technology, Kirk-Othmer, Fourth
Edition
Vol. 1, pp. 461-463, copyright 1978.
2
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