Non-silver salt type photosensitive composition
US4094676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1977 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Feb 14, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/675
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A novel non-silver salt type photosensitive composition which comprises (A) N,N'-diphenyl-p-phenylenediamine as a color developing agent and tetramethylthiuram disulfide which unexpectedly functions rather as another color developing agent than as a storage stabilizer, (B) an organic halide compound as a photoactivator, (C) a salicylic acid derivative as a storage stabilizer for an unexposed photosensitive material, (D) thiourea which functions rather as an agent capable of functioning as both an anti-foggant at and after image formation and a contrasting agent than as a storage stabilizer, and (E) at least one member selected from the group consisting of (i) 2-methylindole, (ii) 2-mercaptothiazoline and (iii) p-diethylaminobenzaldehyde as a color tone adjusting agent. A photosensitive material or film obtained from the present photosensitive composition has an excellent storage stability in the unexposed state, and can give, only by dry process, a blackish brown image having a high photographic density and a high contrast, with fog occurrence reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.