Appeal 2007-3673
Application 10/365,189
a mixture of at least one first thermoplastic polyurethane defining a
component A and at least one second thermoplastic polyurethane defining a
component B,
the component A being at least 5 percent by weight of the mixture and
being obtained by reacting at least one of a first aliphatic polyol having a
molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235
and being selected from the group consisting of polyadipates,
polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding
copolymers or mixtures thereof with 1,6-hexamethylene diisocyanate and a
first chain-extending agent 1,6-hexanediol in an equivalent ratio of the 1,6-
hexamethylene diisocyanate to the polyol of 1.5 : 1 to 14.0 : 1, a first NCO
index equal to a quotient of an equivalent ratio of isocyanate groups to the
sum of the hydroxyl groups of the first aliphatic polyol and the first
chainextending agent, multiplied by a 100, lying within a range of 96 to 105,
the component B being obtained by reacting at least one second
aliphatic polyol having a molecular weight of 800 to 4000 g/mol and a
hydroxyl number of 20 to 235 and being selected from the group consisting
of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans
and corresponding copolymers or mixtures thereof with at least one
diisocyanate selected from the group consisting of 1,4-butanediol, 1,5
pentanediol, 1,4-cyclohexanediol, bis(hydroxymethyl)cyclohexane,
bis(hydroxyethyl)hydroquinone, polycaprolactone having a number average
molecular weight of 350 to 600 g/mol and polytetrahydrofuran having a
number average molecular weight of 200 to 600 g/mol in an equivalent ratio
of the diisocyanate to the polyol of 1.5 : 1 to 14.0 : 1, a second NCO index
equal to a quotient of an equivalent ratio of isocyanate groups to the sum of
the hydroxyl groups, multiplied by 100, of the second aliphatic polyol and
the second chain-extending agent lying within a range of 96 to 105.
The Examiner relies upon the following references:
Kaufhold ‘638 US 6,410,638 B1 Jun. 25, 2002
Kaufhold ‘389 US 6,518,389 B1 Feb. 11, 2003
Muhlfeld US 6,586,553 B1 Jul. 1, 2003
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