Appeal No. 96-1641
Application No. 08/225,036
DECISION ON APPEAL
This is an appeal from the final rejection of claims 1-13
which are all of the claims in the application.
THE INVENTION
Appellants’ invention is drawn to a polyisocyanate binder
containing the reaction product of at least one polyol and a
polyisocyanate mixture made up of from about 50 to about 60%
by weight of polyphenyl polymethylene polyisocyanate and from
about 40 to about 50% by weight of an isomer mixture of
diphenylmethane diisocyanate containing about 4 to about 30%
by weight of the 2,4' isomer and about 70 to about 96% by
weight of the 4,4' isomer. The binder may be used in a
process for bonding lignocellulose materials by coating the
raw material with the prepolymer followed by reacting and
curing the mixture at elevated temperature. Claim 1 is
illustrative and reads as follows:
1. A polyisocyanate binder for lignocellulose-
containing raw materials having a viscosity of less than 1500
cps at 25°C prepared by reacting
a) a polyisocyanate mixture made up of
2
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