| abstract |
Solid particle dispersions of dyes according to the formula:n n wherein D is selected from the group consisting ofn n and ketomethylene nuclei are disclosed as filter dyes for photographic elements. n In this formula, E¹ and E² are each independently electron withdrawing groups. R¹ and R⁶ are each independently R or NHR, where R is substituted or unsubstituted aryl. R² and R³ are each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl, or represent the carbon atoms necessary to form a fused ring with the phenyl ring to which the N atom is attached. R⁴ and R⁷ are each independently hydrogen, substituted or unsubstituted alkyl or substituted or unsubstituted aryl. R⁵ is substituted or unsubstituted alkyl. Z represents the atoms necessary to complete a substituted or unsubstituted 5 or 6 membered heterocyclic nucleus. M⁺ is a cation. L¹ through L⁷ are each independently substituted or unsubstituted methine groups. m is 0, 1, 2, or 3. n is 0 or 1. p is 0, 1, 2, 3, or 4. q is 0, 1, 2, or 3. At least one of R¹ or D includes an aryl ring substituted with a carboxy or sulfonamido substituent. |