Supersensitizing dye combination for electrophotographic composition and element
US3958991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1974 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Aug 7, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to supersensitizing dye combinations useful for organic photoconductive compositions comprising: at least one cyanine, merocyanine, rhodacyanine or styryl spectral sensitizing dye which PA0 1. has an anodic polarographic half-wave potential less than +1.0 volts; PA0 2. has an anodic polarographic half-wave potential and a cathodic polarographic half-wave potential which, when added together, give a sum more negative than -0.10 volts; and PA0 3. desensitizes negative silver bromide emulsions, containing 99.35 mole percent bromide, less than 0.4 log E at radiation of 365 nm. when incorporated therein at a concentration of 0.2 millimole of dye per mole of silver halide; and at least one electron-accepting dye such as a pyrylium or thiapyrylium salt as the supersensitizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.