Appeal No. 96-2504
Application 08/318,328
7. A process for the preparation of a coating which
comprises
a) applying to a water-resistant substrate an
aqueous coating composition containing water and a
binder which consists essentially of a
hydrophilically-modified polyisocyanate component
containing one or more hydrophilically-modified
polyisocyanates which are dispersible in water, said
hydrophilically-modified polyisocyanate component
having a viscosity at 23°C of 100 to 5000 mPa.s, an
average NCO functionality of 2 to 4, a content of
(cyclo)aliphatically bound isocyanate groups of 12
to 21.5% by weight, based on the weight of said
hydrophilically modified polyisocyanate component,
and a content of ethylene oxide units (calculated as
C H 0, molecular weight = 44) present within
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polyether chains of 2 to 20% by weight, based on the
weight of said hydrophilically modified
polyisocyanate component, and
b) curing said aqueous coating composition in the
presence of moisture to form a polyurea coating.
In the rejection of the appealed claims, the examiner
relies upon the following references:
Hombach et al. (Hombach) 4,663,377 May 05, 1987
"Aqueous Polyurethane Dispersions from TMXDI®
(MEDTA) Aliphatic Isocyanate", CYANAMID BULLETIN,
Feb. 1989.
Appellants' claimed invention is directed to a process
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