Two-color heat-sensitive recording material with 2-hydroxy-3-naphthoanilide as both coupler and color developing agent
US4828957A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a two-color heat-sensitive recording material which comprises a base sheet and a recording layer of single-layer or multi-layer structure formed on the base sheet, the recording layer comrising: PA0 (a) a diazonium salt, PA0 (b) a basic leuco dye, PA0 (c) a 2-hydroxy-3-naphthoic acid derivative which acts as a coupler compound for causing the diazonium salt to develop color when heated and which also acts as a color developing material for causing the basic leuco dye to develop color when heated, and PA0 (d) a basic substance, wherein the diazonium salt and the basic leuco dye each form a color upon application of heat, thereby giving the first image of a mixed color, and, then, after irradiation of an active ray to decompose the diazonium salt, the basic leuco dye alone forms its own color upon application of heat, thereby giving the second image whose color is different from the mixed color of the first image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.