Color-forming sulfonamidodiphenylamines and corresponding sulfonimide dyes
US4499304A · kind A · utility
21Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1982 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Jun 8, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3244
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Color-forming para-sulfonamidodiphenylamines and their corresponding sulfonimide dyes are useful in imaging materials. The color-forming sulfonamidodiphenylamines are prepared by condensation reactions. The corresponding sulfonimide dyes are formed by oxidation of the color-forming sulfonamidodiphenylamines by means of a suitable oxidizing agent, such as the oxidized form of a cross-oxidizing silver halide developing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.