Title:
ANTHRAQUINONE DYE FOR THERMAL TRANSFER RECORDING
Document Type and Number:
Japanese Patent JPS6031559
Kind Code:
A
Abstract:
PURPOSE: To obtain the titled dye which has a stable blue color and a high molecular extinction coefficient and does not undergo thermal decomposition under thermal recording head operating conditions, by using a specified anthraquinone compd.
CONSTITUTION: Dyes for thermal transfer recording, of formulas I and II (wherein R is H, methyl). Examples of the dyes are 1,8-diamino-4,5-dihydroxyanthraquinone, 1-amino-4,5-dihydroxyanthraquinone and, 1,5-diamino-4,8-dihydroxyanthraquinone. These dyes may be used either alone or as a mixture of two or more. These dyes can be obtd. by reducing a dinitro dihydroxyanthraquinone to a diaminodihydroxyanthraquinone, and optionally methylating it to form an amonodihydroxymethylaminoanthraquinone.
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Inventors:
NIWA TOSHIO
MURATA YUUKICHI
MAEDA SHIYUUICHI
MURATA YUUKICHI
MAEDA SHIYUUICHI
Application Number:
JP13843483A
Publication Date:
February 18, 1985
Filing Date:
July 28, 1983
Export Citation:
Assignee:
MITSUBISHI CHEM IND
International Classes:
C09B1/503; C09B1/515; C09B67/22; (IPC1-7): C09B1/503; C09B1/515; C09B67/22
Domestic Patent References:
| JPS5367511A | 1978-06-16 |
Attorney, Agent or Firm:
Hajime Hasegawa