Dyestuff for heat-sensitive transfer record and transfer sheet containing same
US5358536A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Jul 31, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0046
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
According to the present invention, there can be provided a black dyestuff for heat-sensitive transfer record comprising at least one orange dyestuff represented by the formula EQU Ar.sub.1 --N=N--Ar.sub.2 --N=N--Ar.sub.3 ( 1) [wherein each of Ar.sub.1, Ar.sub.2 and Ar.sub.3 is independently an aryl group which may have a substituent] and at least one blue dyestuff represented by the formula ##STR1## [wherein each of R.sub.1, R.sub.2 and R.sub.3 is independently a hydrogen atom, halogen atom, nitro group, hydroxyl group, alkyl group which may have a substituent, alkoxy group, alkylsulfonylamino group or alkylcarbonylamino group, and each of R.sub.4 and R.sub.5 is independently an alkyl group which may have a substituent, and a black heat-sensitive transfer sheet in which the above-mentioned dyestuff is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.