Heat-sensitive recording material
US4814320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1987 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Jun 8, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed herein is a heat-sensitive recording material in which a chromogenic dye-procursor comprises: (A) a mixture comprising at least two divinyl phthalide compounds represented by the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 represent respectively alkyl group of 1 to 6 carbon atoms, alkyl group of 1 to 4 carbon atoms having an alkoxy group of 1 to 4 carbon atoms or cycloalkyl group of 5 to 7 carbon atoms, X.sup.1 and X.sup.2 represent respectively hydrogen atom, alkyl group of 1 to 8 carbon atoms, alkoxy group of 1 to 8 carbon atoms, alkoxy group of 1 to 4 carbon atoms having an alkoxy group of 1 to 4 carbon atoms, cycloalkoxy group of 5 to 7 carbon atoms, alkenyloxy group of 3 to 8 carbon atoms, benzyloxy group, substituted benzyloxy group, furfurloxy group, tetrahydrofurfuryloxy group, phenyl group, substituted phenyl group, phenoxy group, substituted phenoxy group, fluorine atom, chlorine atom or bromine atom, m and n represent 0 or integer of 1 to 4, m+n=4 and R.sup.1 and R.sup.2 may join together to form a heterocyclic ring, or (B) a mixture of the divinyl phthalide compound(s) represented by the formula (I) and at least one compound selected from the compounds r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.