Dai Nippon Printing Co., Ltd.

Mitsui Toatsu Chemicals, Incorporated

Dai Nippon Insatsu Kabushiki Kaisha

Komei Kafuku

Hiroshi H Eguchi

Ryohei Takiguchi

Masayuki M Nakamura

Hitoshi Saito

Keisuke Takuma

Jumpei J Kanto

Hitoshi Koshida

Tsukasa Ohyama

Yoriaki Matsuzaki

Isamu Ghoda

Yasushi Shimokawa

Hideaki Sato

Shigeo Yasui

Kenichi Aso

Ayashi Noguchi

Masashi Ono

A thermal transfer sheet wherein a clear image having a sufficient density is formed in a thermal transfer process using a sublimable dye and wherein the formed image exhibits excellent fastnesses, particularly excellent light fastness. The thermal transfer sheet includes a base sheet and a dye-containing layer formed on one surface of the base sheet wherein a dye contained in the dye-containing layer includes a mixture of two or more specific dyes.

Thermal transfer sheet

An object of the present invention is to provide a thermal transfer sheet wherein a clear image having a sufficient density is formed in a thermal transfer process using a sublimable dye and wherein the formed image exhibits excellent fastnesses, particularly excellent light fastness. The present invention is directed to a thermal transfer sheet comprising a base sheet and a dye-containing layer formed on the one surface of the base sheet wherein a dye included in the dye-containing layer comprises a mixture of two or more specific dyes.

A dyestuff for heat-sensitive transfer record is here disclosed which can be represented by the formula (1) ##STR1## wherein R.sub.1 is a hydrogen atom, alkyl group having 1 to 8 carbon atoms or cycloalkyl group; R.sub.2 is a hydrogen atom, halogen atom, alkoxy group which may be substituted, alkylthio group which may be substituted or arylthio group which may be substituted; R.sub.3 is a branched alkyl group having 3 to 5 carbon atoms, O-substituted oxycarbonyl group, N-substituted aminocarbonyl group in which an N-substituted group may form a ring, or a substituted or unsubstituted heterocyclic ring having two or more atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom; and when R.sub.1 is a hydrogen atom, R.sub.3 is a branched alkyl group having 3 to 5 carbon atoms, or a substituted or unsubstituted heterocyclic ring having two or more atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom; and there are also disclosed an ink for heat-sensitive transfer record and a transfer sheet in which the above-mentioned dyestuff is used.

Dye for heat-sensitive transfer record and ink composition for

Heat transfer sheet

The heat transfer sheet according to this invention including a substrate sheet and a dye carrier layer formed on one side of the substrate sheet and includes a dye and a binder. The dye contained in the dye carrier layer includes a compound having two chromophores linked together through a divalent linking group, and is improved in terms of both color density and storability, thus producing excellent effects.

Dye for heat-sensitive transfer record, ink composition for

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Tokyo, Japan

Komei Kafuku