Liquid crystalline filter dyes for imaging elements
US6180295A · kind A · utility
11Cited by
9References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention is a dispersion comprising a solvent having dispersed therein a liquid-crystal forming dye of structural Formula I: EQU [D--(X).sub.m ]--(Y).sub.n I wherein: PA1 D is a merocyanine dye; PA1 each Y contains an ionic or a nonionic solubilizing substituent or a group with a pKa value of less than 4 in water; PA1 each X is a nonionic substituent; PA1 n is 1 to 10; PA1 m is 0-10; and the resulting dye forms a liquid-crystalline phase in solvent. The dispersion is particularly useful in imaging and photographic elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.