Appeal No. 2006-0739
Application No. 09/802,760
APPEALED SUBJECT MATTER
Claims 1, 25 and 47 are representative of the subject matter
on appeal and read as follows:
1. A polyurethane elastomer comprising the
reaction product of:
a polyisocyanate prepolymer formed by reacting an
isocyanate with a polyol, said polyisocyanate
prepolymer being present in an amount of from 45 to 70
weight percent based on total weight of the elastomer
composition;
a polyether polyol prepolymer present in an amount
of from 25 to 50 weight percent based on total weight
of the elastomer composition; and
a hardener mixture comprising at least one
additional polyol and at least one charge-control
agent, the at least one charge control agent being a
polyol capable of being copolymerized with the
polyisocyanate prepolymer, the polyether polyol, and
the hardener mixture, the hardener mixture being
present in an amount of from 1 to 25 weight present of
the total elastomer composition,
the amounts of the polyisocyanate prepolymer, the
polyether polyol, and hardener mixture being selected
such that the equivalent ratio of hydroxyl
functionality to isocyanate functionality is from 0.96
to 1.04.
25. A polyurethane elastomer comprising the
reaction product of:
a polyisocyanate prepolymer formed by reacting an
isocyanate with a polyol, said polyisocyanate
prepolymer being present in an amount of from 45 to 70
weight percent based on total weight of the elastomer
composition;
a polyether polyol prepolymer present in an amount
of from 25 to 50 weight percent based on total weight
of the elastomer composition; and
a hardener mixture comprising at least one
additional polyol and at least one charge-control agent
2
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