Photographic silver halide material containing a dye filter or a dye anti-halation layer
US4294917A · 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 C)Chemistry; Metallurgy
- CPC primaryC09B23/02
- 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 a water-insoluble dye of the formula ##STR1## wherein each of L, L' and L" are an optionally subsituted methine group, n is 0 or 1, Q is an optionally substituted aryl group or an optionally substituted heteroaromatic group, R.sub.1 represents a hydrogen atom or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or an optionally substituted amino group, R.sub.2 represents a hydrogen atom or a hydroxy, amino, --CN, --COOR.sup.1, --CONR.sup.1 R.sup.2 or --COR.sup.1 group or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical, and R.sub.3 represents a --CN, --COOR.sup.3, --CONR.sup.3 R.sup.4, --SO.sub.3 H, --SO.sub.3.sup..crclbar. or --COR.sup.3 group, where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently represent a hydrogen atom or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical, in a binder. The solid dispersion of the dye is finely divided in the binder material of said layer which normally is a filter or anti-halation layer. A marked increase in sharpness of the imag…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.