Appeal 1997-3039
Application 08/436,939
Brahm (alternatively published Canadian Patent Application
2,155,684) is reversed.
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The broadest claim on appeal is claim 1, which reads:
An olefinically unsaturated polyisocyanate
containing allophanate groups and having:
a) an NCO [isocyanate] content of 6 to 20% by
weight,
b) a content of olefinic double bonds corresponding
to an iodine value of 15 to 150,
c) a content of hydrocarbon chains containing 12 to
30 carbon atoms of 100 to 700 mg/g and
d) a content of allophanate groups (expressed as
C NH O , molecular weight = 101) of 10 to 300
2 23
mg/g.
Slack describes polyisocyanates which are similar to
those claimed which can be made from a wide variety of
hydroxy-containing compounds (col. 3, line 29 through col. 5,
line 28). Included among the hydroxy-containing compounds are
"fatty alcohols having 10 to 20 carbon atoms" (col. 3, lines
56-57). The difference between claim 1 and Slack is that
Slack does not explicitly describe the use of a fatty alcohol
having "olefinic double bonds."
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