Appeal 2006-3071
Application 09/811,987
Claim 1 illustrates Appellants’ invention of a process for preparing
high functionality polyisocyanates having at least three free isocyanate
groups, and is representative of the claims on appeal:1
1. A process for preparing high functionality polyisocyanates having
at least three free isocyanate groups, which comprises
(i) preparation of an addition product (A) which contains only one
group which is reactive toward isocyanate and at least two free isocyanate
groups by reacting
(a) a diisocyanate or polyisocyanate I with
(b1) compounds having at least three groups which are reactive
toward isocyanate or
(b2) compounds containing two groups which are reactive
toward isocyanate or mixtures of (b1) and (b2),
where at least one of the components (a) or (b) has functional groups
having different reactivities toward the functional groups of the other
component and the reaction ratio is selected so that the addition product (A)
contains an average of only one group which is reactive toward isocyanate,
and at least two free isocyanate groups.
(ii) optionally, intermolecular addition reaction of the addition
product (A) to form a polyaddition product (P) containing an average of only
one group which is reactive toward isocyanate and an average of more than
two free isocyanate groups, and
(iii) reaction of the isocyanate reactive group of said addition product
(A) and/or the polyaddition product (P) with a diisocyanate or
polyisocyanate II to form a high functionality polyisocyanate having at least
three free isocyanate groups and no free isocyanate reactive groups.
The reference relied on by the Examiner is:
Bauriedel US 4,623,709 Nov. 18, 1986
1 We have copied claim 1 as it stands of record and appears in the Claim
Appendix to the Brief, including the period (“.”) at the end of the first
clause.
2
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