Ballasted optical brighteners

Details Ballasted optical brighteners Ballasted optical brighteners

1993-12-08

1995-03-07

Neville, Thomas R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Antihalation or filter layer containing

430539, 430518, 430504, 430139, 430933, 430628, 25230121, 25230123, 25230125, 530354, G03C 1815

Patent

active

053957482

ABSTRACT:
An inexpensive, ballasted optical brightener for use in photographic elements is prepared by reacting an optical brightener of the formula ##STR1## where M is a cation; X is a group capable of undergoing nucleophilic displacement; and Z is ##STR2## or --O--R.sub.3, where each of R1 and R2 is a hydrogen atom, or an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X; and R3 is an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X

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Research Disclosure, Dec. 1989, Photographic Silver Halide Emulsions, Preparations, Addenda, Processing and Systems, pp. 993-1015.

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