Photographic silver halide emulsions
US4307185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1976 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Sep 3, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/29
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic emulsion spectrally sensitized with a sensitizing combination of at least one sensitizing dye represented by General formula (I), at least one sensitizing dye represented by General formula (II) and at least one sensitizing dye represented by General formula (III): ##STR1## wherein Z.sup.1 and Z.sup.2 each is the atoms necessary to form a benzothiazole nucleus or a benzoselenazole nucleus, R.sup.1 and R.sup.2 each is an alkyl group or a substituted alkyl group, wherein at least one of R.sup.1 and R.sup.2 is a substituted alkyl group having a sulfo group, R.sup.3 is an alkyl group, X.sub.1 is an acid anion and m is 1 or 2 and when the dye forms an intermolecular salt (betaine like structure), m is 1; ##STR2## wherein Z.sup.3 is a sulfur atom or a selenium atom, Z.sup.4 is the atoms necessary to form a benzothiazole nucleus, a benzoselenazole nucleus, a naphtho[1,2-d]thiazole nucleus or a naphtho[1,2-d]selenazole nucleus, R.sup.4 and R.sup.5 each is an alkyl group or a substituted alkyl group, wherein at least one of R.sup.4 and R.sup.5 is a substituted alkyl group having a sulfo group, R.sup.6 is an alkyl group, an aryl group, a furyl group or a thienyl …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.