Solid particle dispersions of dyes useful in photographic...

Details Solid particle dispersions of dyes useful in photographic... Solid particle dispersions of dyes useful in photographic...

G - Physics

03

C

96/174

G03C 1/825 (2006.01) C09B 23/10 (2006.01) G03C 1/83 (2006.01)

Patent

CA 1334803

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.

581817

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