Appeal No. 2006-1958 2
Application No. 10/268,208
Appellants argue the patentability of the appealed claims as a group, rather than
individually. Accordingly, we consider all the claims as standing or falling together for
purposes of this appeal. 37 CFR § 41.37 (c) (vii); compare In re Nielson, 816 F.2d
1567, 1572, 2 USPQ 2d 1525, 1528 (Fed. Cir. 1987). In re Burckel, 592 F.2d 1175,
1179, 201 USPQ 67, 70, (CCPA 1979) . Pursuant to 37 CFR § 41.37 (c) (vii) we shall
limit our consideration to claim 1, the sole independent claim 1, which reads as follows:
Claim 1:
A process for the production of a solid polyurethane molding having a flexural
modulus of elasticity> 1800 N/mm2 (according to DIN 53 457) by the casting
process comprising reacting
(a) a diisocyanate and/or polyisocyanate from the
diphenylmethane series with a polyol component comprising
(b) from 30 to 70 w.%, relative to total weight of components
b), c) and d), of a polyether polyol having a number-average
molecular weight of from 149 to 999 g/mol, which is
initiated with an aliphatic amine,
(c) from 25 to 50 wt.%, relative to total weight of components
b), c) and d), of a polyether having a number-average
molecular weight of from 1,000 to 16,000 g/mol, at least
one group capable of reacting with an isocyanate group
and having a maximum of 80% of primary hydroxyl groups,
(d) from 0 to 30 wt.%, relative to total weight of components
b), c) and d), of a polyether polyol started with a
polyhydroxyl compound and having a (number-
average) molecular weight of from 62 to 999 g/mol,
optionally in the presence of
(e) a catalyst that accelerates an isocyanate addition
reaction, and optionally
(f) any of the auxiliary substances and additives known
to those skilled in the art of polyurethane chemistry,
in which the type and proportions of components b) to d) are selected so an
average hydroxyl value of the mixture formed from these components
is greater than 300 mg KOH/g.
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