Liquid crystalline filter dyes for imaging elements
US6214499A · kind A · utility
13Cited by
11References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention comprises dispersion comprising a solvent having dispersed therein a liquid-crystal forming dye of structural Formula I: EQU [D-(X).sub.m ]-(Y).sub.n wherein: PA1 D is a light-absorbing chromophore other than a cyanine dye or a barbituric acid oxonol 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 0 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.