Appeal No. 2006-0739
Application No. 09/802,760
capable of being copolymerized with the polyisocyanate
prepolymer, the polyether polyol prepolymer, and the
hardener mixture such that the charge-control agent is
covalently bonded to the polyurethane elastomer, the
hardener mixture being present in an amount of from 1
to 25 weight percent of the total elastomer
composition,
the amounts of the polyisocyanate prepolymer, the
polyether polyol prepolymer, and hardener mixture being
selected such that the equivalent ratio of hydroxyl
functionality to isocyanate functionality is from 0.96
to 1.04, and the charge-control agent is present in an
amount of less than 2 weight percent based on total
weight of the elastomer.
47. A polyurethane elastomer comprising:
a polyisocyanate prepolymer formed by reacting an
isocyanate with a polyether 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 polyol charge-
control agent, the hardener mixture being present in an
amount of from 1 to 25 weight percent of the total
elastomer composition;
the amounts of the polyisocyanate prepolymer, the
polyether polyol prepolymer, and the hardener mixture
being selected such that the equivalent ratio of
hydroxyl functionality to isocyanate functionality is
from 1.00 to 1.04, and the charge-control agent is
present in an amount of less than 1 weight percent
based on total weight of the elastomer, the polyol
charge-control agent being selected from at least one
of formula (I) or formula(II):
3
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