SOLID PARTICLE DISPERSION FILTER DYES FOR PHOTOGRAPHIC COMPOSITIONS

摘要

Solid particle dispersion of dyes of the formula: [D-(A)y]-Xn, where D is a chromophoric light-absorbing compound, which may or may not comprise an aromatic ring if y is not 0 and which comprises an aromatic ring if y is 0, A is an aromatic ring bonded directly or indirectly to D, X is a substituent, either on A or on an aromatic ring portion of D, with an ionizable proton, y is 0 to 4, and n is 1 to 7, where the dye is substantially aqueous insoluble at a pH of 6 or below and substantially aqueous soluble at a pH of 8 or above, are useful as filter dyes for photographic compositions. They may be coated in photographic layer without a mordant, and they do not wander at coating pH's. At processing pH's, however, they are solubilized for easy removal and/or decolorization.