| abstract |
Solid particle dispersions of dyes according to the formula: <IMAGE> are useful as filter dyes in photographic elements. In this formula, R1 and R2 are each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl, or together represent the atoms necessary to complete a substituted or unsubstituted 5- or 6-membered ring. R3 and R4 each independently represents H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, CO2H, or NHSO2R6. R5 is H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, carboxylate, or substituted or unsubstituted acyl, R6 and R7 are each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl, and n is 1 or 2. R8 is either substituted or unsubstituted alkyl, or is part of a double bond between the ring carbon atoms to which R1 and R2 are attached. At least one of the aryl rings of the dye molecule must have at least one substituent that is CO2H or NHSO2R6. |