Liquid crystalline filter dyes for imaging elements
US6527977B2 · kind B2 · utility
16Cited by
7References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2001 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Feb 3, 2021 |
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:[D-(X)m]-(Y)n wherein:D is a light-absorbing chromophore other than a cyanine dye or a barbituric acid oxonol dye;each Y contains an ionic or a nonionic solubilizing substituent or a group with a pKa value of less than 4 in water;each X is a nonionic substituent;n is 0 to 10;m is 0-10; andthe 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.