Appeal No. 2007-1487
Application 09/562,632
Claim 1 illustrates Appellants’ invention of a coating, and is
representative of the claims on appeal:
1. A coating composition comprising
a) 30 to 95 wt.% of an aqueous, hydroxy-functional, acid-group
containing resin dispersion, said dispersion having an hydroxyl value of
from 8 to 264 mg KOH/g resin solids and an acid value of from 3 to 100 mg
KOH/g resin solids,
b) 5 to 70 wt.% of a polyisocyanate component having a free
isocyanate group content of 5 to 50 wt.% and a viscosity of 5 to 10,000
mPa.s at 23°C and D = 40s-1 and
c) 0.1 to 10 wt.% of an epoxy functional silane component, inert to
isocyanate groups and reactive with acid groups in said dispersion via epoxy
groups, of the general formula (|)
X
|
W―(CH2)n―Si―Y (|)
|
Z
wherein
W denotes the group
O
O
or O (CH2)m CH CH2
with m = 1 to 4 and
n denotes a whole number from 2 – 4
and
X, Y, Z represent, independently of one another, the same or different
organic groups with 1 to 30 atoms, with the proviso that at least one of the
groups represents an alkoxy group with 1 to 4 carbon atoms,
2
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