Salicylic acid derivatives, the process for preparing the same and the heat-sensitive recording materials comprising thereof
US5306688A · kind A · utility
2Cited by
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12Claims
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Key dates
| Filing date | Sep 18, 1992 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Sep 18, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3336
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A heat-sensitive recording material comprising a color forming, electron donating compound and a salicylic acid derivative represented by the formula (1): ##STR1## wherein X.sub.1 and X.sub.2 are a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group or a halogen atom, Y.sub.1 and Y.sub.2 are an oxygen atom or a sulfur atom, R.sub.1 is a hydrogen atom, an alkyl group, an aralkyl group or an aryl group , and R.sub.2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group, and/or a metal salt of the salicylic acid derivative as an electron accepting compound, is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.