Thermographic recording material with improved image density and/or image gradation upon thermal development
US6037114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/4989
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A recording material exclusive of a thermal bleachable dye comprising a support and a thermosensitive element comprising an organic silver salt, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the recording material further contains non-halide-ion-containing arylonium compound exclusive of compounds according to formula (I): ##STR1## wherein L.sub.a is a valence bond or a divalent or trivalent linking group, L.sub.2 is an alkylene group, each of R.sub.a and R.sub.b is a hydrogen atom or monovalent substituent group, M.sub.1 is an onium ion, R.sub.a and R.sub.b may form a ring taken together and D is an electron donative group of atoms, with the proviso that where D is a hydrazino group which is not a part of a semicarbazido group, no oxo group is substituted to the carbon atom which is directly attached to a nitrogen atom of the hydrazine; and a recording process therefor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.