Pyridine color formers
US4363503A · kind A · utility
5Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1981 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Mar 16, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel 4-aryl-or heteroaryl-2,6-bis[(substituted-amino)phenyl]pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting a 2-, 3- or 4-R.sub.1 R.sub.2 N-acetophenone with an aryl or heteroaryl aldehyde in the present of ammonia or an ammonia-releasing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.