TRIAZOLE DERIVATIVES AND THEIR USE AS COLOUR COUPLERS IN SILVER HALIDE PHOTOGRAPHIC LIGHT-SENSITIVE MATERIALS

摘要

1523240 Photographic development inhibitor releasing coupler FUJI PHOTO FILM CO Ltd 7 July 1977 [13 July 1976] 28620/77 Heading G2C [Also in Division C2] A colour coupler for use in a photographic silver halide emulsion or colour developer solution comprises a compound of the general Formula: in which groups R1 and R2 each represents an aliphatic group, an aromatic group or a heterocyclic group and furthermore where two R2 groups present they can be linked and together represent the atoms necessary to form, together with the nitrogen atom to which they are attached, a nitrogen-containing heterocyclic group; and Y represents a group capable of being released from said coupling compound upon reaction with the oxidation product of a colour developing agent so as to form a compound which has a development-inhibiting effect, which group Y has a triazole ring bonded to the carbon atom shown in Formula (I) through the nitrogen atom at the 1-position of said ring. This development inhibitor releasing (DIR) coupler has a high activity, controls image tone, reduces graininess, improves sharpness and colour reproducibility, and does not adversely affect the stability of the photographic material.