Appeal No. 94-4495
Application 07/865,165
The Claimed Subject Matter
The claims on appeal are directed to a process for preparing a binary sensitizing dye
compound. Claims 1 and 3 are illustrative of the claimed subject matter:
1. A process for the preparation of binary sensitizing dyes comprising reacting
a solution of two dye compounds, one of which contains a carboxyl and the other of
which contains an amino or a hydroxyalkyl, in the presence of a 2-halo-1-1-
alkylpyridinium salt and a 4-dialkylaminopyridine so that the two dye compounds
undergo a dehydrative condensation reaction.
3. A process according to claim 1 wherein one of said dye compounds can
adsorb to a silver halide grain surface and the other of said dye compounds is
substantially non-adsorbable to a silver halide grain surface, and the resulting binary
sensitizing dye is of general formulas (I), (II), or (III)
2
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