Marking systems
US4688059A · kind A · utility
4Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1986 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Oct 20, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D405/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to 3-aryl or heteroaryl-3-alkoxy, phenoxy-, alkylthio- or phenylthiophthalides useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared by the interaction of 2-(disubstituted amino)phenylcarbonylbenzoic acids with an acid chloride or an anhydride of an alkanoic acid in the first step and a further reaction of the product of the first step with an alcohol, a thioalcohol, a phenol or a thiophenol in a second step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.