High contrast dot enhancing compositions and photographic produc

Details High contrast dot enhancing compositions and photographic produc High contrast dot enhancing compositions and photographic produc

1988-06-27

1989-11-21

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430446, 430487, 430598, 430614, G03C 106

Patent

active

048822612

ABSTRACT:
Novel dot enhancing compositions are disclosed for use in high contrast negative-working image-forming systems. The compositions include compounds of the general formula: ##STR1## wherein R.sub.1 is an aromatic group, A is a substituted or unsubstituted aromatic nucleus, and the two carboxyl groups specifically depicted in general formula (I) are each bound to a different carbon atom of said aromatic nucleus.
The dot enhancing compositions may be incorporated into a silver halide photographic emulsion or into another hydrophilic colloid layer of a photographic material, or into a developing solution or, alternatively, into both. The dot enhancers of the invention improve density and contrast of images formed, as well as providing a harder, smoother, better formed dot for use in letter press and offset lithography.

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patent: 4650746 (1987-03-01), Simson et al.
patent: 4681836 (1987-07-01), Inoue et al.
patent: 4686167 (1987-08-01), Resnick et al.

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