Photographic silver halide material containing a dye filter or a dye anti-halation layer
US4294916A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1980 |
| Grant date | Oct 13, 1981 |
| Priority date | — |
| Expiry date | Apr 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/832
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A photographic silver halide material is provided which comprises in at least one layer a solid dispersion of at least one water-insoluble methine dye of the formula ##STR1## wherein L and L' each represent an optionally substituted methine group, n is O, 1 or 2, Z represents the atoms necessary to complete an optionally substituted acidic carbocyclic or heterocyclic ring, Y represents the atoms necessary to complete an optionally substituted basic carbocyclic or heterocyclic ring, at least one of the rings Z and Y being substituted by a --COOH group or being substituted by a group which comprises a --COOH group. The solid dispersion of the dye is finely divided in the binder material of said layer, which is normally a filter or anti-halation layer. A marked increase of sharpness of the images obtained from photographic material containing in at least one layer the solid dyestuff dispersion can be observed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.