Heat-sensitive recording material
USRE36321E · kind E · reissue
Assignees
Inventors
Key dates
| Filing date | Jun 20, 1988 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jun 20, 2008 |
Classification
- Technology area (CPC —)General
Abstract
In a heat-sensitive recording material incorporating a colorless or pale-colored basic dye and a color acceptor which is reactive with the basic dye to form a color when contacted therewith, the recording material characterized in that at least one compound represented by the formula I! is contained in a heat-sensitive recording layer ##STR1## wherein X is --O-- or --COO--, R.sub.1 to R.sub.4 are each hydrogen atom, alkyl having 1 to 8 carbon atoms, aryl having 6 to 10 carbon atoms, aralkyl having 7 to 9 carbon atoms, chlorine atom, acetyl, propionyl, methoxy, methylthio, methoxycarbonyl, cyano, nitro or cyclohexenyl, substituents R.sub.1 and/or R.sub.2 or substituents R.sub.3 and R.sub.4 may link together to form aromatic ring(s), n is an integer of 1 to 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.