Appeal No. 95-2008
Application No. 08/032,178
APPENDIX
13. Process for the preparation of pigment paste
resins for cathodically depositable coating compositions,
comprising reacting -
(A) at least one diepoxide compound which has the schematic
structure -
Z - Y - X - Y - Z,
wherein X is the moiety of an aliphatic diepoxy resin which
has polyoxyalkylene structures and which remains after
reacting the epoxy groups, Y is the moiety of a primary
(hydroxy)alkylmonoamine or a secondary
(polyoxy)alkylenediamine or a diphenol, and Z is the moiety of
an epichlorohydrin-bisphenol A-epoxy resin, which contain(s),
based on the total weight of the diepoxide compound 10 to 50%
by weight of polyoxyalkylene structures, and up to 20% by
weight of alkyl or alkylene or hydroxyalkyl radicals with more
than 3 carbon atoms, and has a glass transition temperature
between 10 and 40°C, with
(B) 50 to 100 mol%, based on the epoxide groups in (A), of a
primary-tertiary diamine and, thereafter,
(C) reacting 50 to 100 mol% of formaldehyde, based on the
total of the primary amino groups of the amines used in (B),
with the reaction product of (B) to form oxazolidine
structures, said process being completed without
quaternization.
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