Light-absorbing methine dyes and photographic materials...

Details Light-absorbing methine dyes and photographic materials... Light-absorbing methine dyes and photographic materials...

C - Chemistry, Metallurgy

09

B

96/136, 260/305.

C09B 23/02 (2006.01) G03C 1/83 (2006.01)

Patent

CA 1142527

Abstract Light-absorbing fluorine-containing 2-pyrazolin-5-one methine oxonol dyes corresponding to the formula Image wherein R is C1-C5 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 decolourized easily in one of the processing baths. They are prepared by joining 2 ap- propriately substituted pyrazolone rings in 4-position by 1 methine group-through reaction with an ester of an ortho- carboxylic acid or by a tri- or pentamethine group through reaction with ? -anilinoacrolein anil HCl or glutaconic dialdehyde dianil HCl respectively.

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