"Trisazo compounds prepared from 4,4',4""-triaminotriphenylamine and 2-hydroxy-3-phenylcarbamoylbenzo[a]carbazole derivatives"
US4507471A · kind A · utility
16Cited by
1References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 19, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | May 19, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/0688
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Trisazo compounds having the following general formula I: ##STR1## are useful as charge carrier generating materials for electrophotographic elements. Multilayer electrophotographic elements having a charge carrier generating layer containing these compounds as charge carrier generators and having a separate charge transport layer containing a charge transport material are particularly excellent in sensitivity in the 780-800 nm wavelength region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.