Appeal No. 2002-1791
Application No. 08/588,945
Claim 26 is reproduced below:
26. A method of crosslinking a waterborne coating binder
polymer bearing at least two carboxylic acid groups
comprising admixing said polymer and an aromatic
polycarbodiimide having the formula
H3C-O-{-CH2CH2-O}3-C(O)N(H)-[R-N=C=N-]n-R’-N(H)C(O)-
{O-CH2CH2-}p-O-CH3
wherein m is an integer of from 5 to 10; n is an integer of
from 2 to 7; p is an integer of from 5 to 10; and R and R’
are independently selected from arylene, alkyl-substituted
arylene, biarylene alkylene or alkyl-substituted biarylene
alkylene.
The prior art references relied upon by the examiner are:
Hoeschele 3,450,562 Jun. 17, 1969
Taylor EP 0 241 805 A2 Oct. 21, 1987
(Published European Patent Application)
Mallon EP 0 277 361 A1 Aug. 10, 1988
(Published European Patent Application)
Claims 26 and 27 stand rejected under 35 U.S.C. § 103 as
unpatentable over the combined disclosures of Hoeschele and
either Taylor or Mallon.
We have carefully reviewed the claims, specification and
applied prior art, including all of the arguments advanced by
both the examiner and the appellants in support of their
respective positions. This review has led us to conclude that
the examiner’s Section 103 rejection is well founded.
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