3-(9-Julolidinyl)-3-(diphenylamino)phthalides
US4168378A · kind A · utility
5Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1977 |
| Grant date | Sep 18, 1979 |
| Priority date | — |
| Expiry date | Aug 4, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/327
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
3-[4-Disubstituted-amino)phenyl] or (9-julolidinyl)-3-(diphenylamino)phthalides useful as color formers in pressure-sensitive and thermal marking systems are prepared by reaction of 2-[4-disubstituted-amino)benzoyl] or (9-julolidinyl-carbonyl)benzoic acids with diphenylamines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.