Photographic materials containing light absorbing methine dyes

Details Photographic materials containing light absorbing methine dyes Photographic materials containing light absorbing methine dyes

1980-02-15

1981-05-05

Brammer, Jack P.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Antihalation or filter layer containing

542444, G03C 184

Patent

active

042660149

ABSTRACT:
Light-absorbing fluorine-containing 2-pyrazolin-5-one methine oxonol dyes corresponding to the formula ##STR1## wherein R is C.sub.1 -C.sub.5 alkyl, aryl, alkoxycarbonyl, carboxy, or carbamoyl, and n is 0, 1, or 2.
The dyes can be used in light-sensitive silver halide materials in an antihalation layer, in a filter layer or as screening dyes in a light-sensitive layer. They manifest great stability while in dissolved state within a very large pH-range and they are decolorized easily in one of the processing baths. They are prepared by joining 2 appropriately substituted pyrazolone rings in 4-position by 1 methine group through reaction with an ester of an orthocarboxylic acid or by a tri- or pentamethine group through reaction with .beta.-anilinoacrolein anil HCl or glutaconic dialdehyde dianil HCl respectively.

REFERENCES:
patent: 3512983 (1970-05-01), Watanabe et al.
patent: 3865817 (1975-02-01), Kobayaski et al.
patent: 3876429 (1975-04-01), Poppe et al.

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