Solid particle dispersions of dyes according to the formula:
wherein D is selected from the group consisting of
are disclosed as filter dyes for photographic elements.
In this formula, R¹, R², R³, and R⁴ are each independently hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl. R is a carboxy or sulfonamido substituent. L¹ through L⁵ are each independently substituted or unsubstituted methine groups, and m is 0 or 1. The dyes of the invention are particularly useful as filter dyes for light in the ultraviolet and short blue wavelength regions of the spectrum.
按以下公式计算的
染料固体颗粒分散体:
其中 D 选自以下组别
作为照相元件的过滤
染料被公开。
在该式中,R¹、R²、R³ 和 R⁴ 各自独立地为氢、取代或未取代的烷基或取代或未取代的芳基。R 是羧基或磺酰胺基取代基。L¹ 至 L⁵ 各自独立地为取代或未取代的甲基,且 m 为 0 或 1。本发明的
染料作为光谱中紫外线和短蓝光波长区域的滤光
染料尤其有用。