Magenta triphenylmethane antihalation dyes for photographic elem

Details Magenta triphenylmethane antihalation dyes for photographic elem Magenta triphenylmethane antihalation dyes for photographic elem

1977-01-27

1978-09-19

Curtis, Allen B.

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

260390, 8177AB, G03C 184, C09B 1114

Patent

active

041151267

ABSTRACT:
Novel magenta dyes of the following structure ##STR1## where R.sub.1 and R.sub.2 = same or different lower alkyl (C.sub.1 -C.sub.5) groups, optionally substituted; wherein when R.sub.3 = a lower alkyl group, then R.sub.4 =--(CH.sub.2).sub.n CO.sub.2 H; and when R.sub.4 = hydrogen, then R.sub.3 = (CH.sub.2).sub.n CO.sub.2 H; where n = an integer from 1-4, and X is a salt-forming anion.
These dyes are particularly useful in photographic elements comprising a support, a photosensitive silver halide layer, and a filter layer or antihalation layer containing an organic binder.

REFERENCES:
patent: 1912797 (1933-06-01), Schneider
patent: 2606833 (1952-08-01), Glickman
patent: 3005711 (1961-10-01), Burgardt et al.
patent: 3382074 (1968-05-01), Kimura et al.
patent: 3406069 (1968-10-01), Overman
patent: 3647349 (1972-03-01), Raue et al.

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