Thermal imaging method
US4960901A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1987 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Oct 29, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D513/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A thermal imaging method is provided which comprises heating imagewise a di- or triarylmethane compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with a moiety ring-closed on the meso carbon atom directly through a nitrogen atom, which nitrogen atom is also bound to a group with a masked acyl substituent that undergoes fragmentation upon heating to liberate the acyl group for effecting intramolecular acylation of said nitrogen atom to form a new group in the ortho position whereby the di- or triarylmethane compound is rendered colored in an imagewise pattern corresponding to said imagewise heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.