Benz (c) fluoran compounds and recording sheet containing them
US3947471A · kind A · utility
4Cited by
5References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | May 20, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | May 20, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3275
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Novel benz[c]fluoran compounds such as 2-phenylamino-8-diethylamino-benz[c]fluoran, 2-(2',4',6'-trimethylphenylamino)-8-diethylamino-benz[c]fluoran and N-[8-diethylaminobenz[c]fluoran-2-yl]-N-[6-diethylaminofluoran-2-yl]amine, which are useful as a coloring material for record material systems such as pressure-sensitive copying paper or heat-sensitive copying paper, wherein colored images formed by an electron-donoracceptor color-forming reaction between coloring material and acidic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.