Dai Nippon Insatsu Kabushiki Kaisha

Dai Nippon Printing Co., Ltd.

Koumei Kafuku

Masayuki M Nakamura

Hiroshi H Eguchi

Jumpei J Kanto

Ryohei Takiguchi

Hitoshi Saito

Junji Chiba

Kaoru Suda

The present invention provides a pyridine derivative represented by the following formula A or B, a dye produced by coupling the pyridine derivative A or B with an arbitray coupler and a thermal transfer sheet wherein use is made of the dye. In a thermal transfer process wherein use is made of a sublimable dye, the dye and the thermal transfer sheet according to the present invention can form a clear image having a sufficient density and an excellent light fastness. ##STR1##

Thermal transfer sheet

A heat transfer sheet for use with a sublimation-type heat transfer printing method, capable of producing a high-quality image having high preservability, comprising a substrate sheet, and a dye layer which is formed on one surface of the substrate sheet, the dye layer containing a sublimable dye represented by the formula (I), (II), (III) or (IV) shown below. ##STR1##

Heat transfer sheet

A thermal transfer sheet including a substrate sheet and a dye supporting layer formed on one surface of said substrate sheet, characterized in that the dye contained in said dye supporting layer is represented by the following general formula ##STR1## wherein R.sub.1 stands for a substituted or unsubstituted alkyl group, cycloalkyl group, aralkyl group or aryl group or an atom or atom group which combines with X to form a five- or six-membered ring; R.sub.2 stands for a substituted or unsubstituted alkyl group, a cycloalkyl group, an aralkyl group or an aryl group, provided that R.sub.1 and R.sub.2 may combine with each other to form a five- or six-membered ring which may have an oxygen or nitrogen atom; R.sub.3 stands for a hydrogen atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, cycloalkyl group, alkoxy group, aralkyl group, aryl group, acyl group, acylamino group, sulfonylamino group, ureido group, carbamoyl group, sulfamoyl group or amino group; R.sub.4 stands for a substituted or unsubstituted three- to five-membered cycloalkyl group or thienyl group bonded at the .beta.-position, or a substituted or unsubstituted five- or six-membered cycloalkenyl group, or a group represented by the following formula ##STR2## R.sub.5 and R.sub.6 which may be the same or different stand for a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, alkoxy group, acylamino group, sulfonylamino group or ureido group; X stands for a hydrogen atom or an atom or atom group which combines with R.sub.1 to form a five- or six-membered ring; n is 1 or 2; R.sub.7 and R.sub.8 stand for a hydrogen atom, a halogen atom or a lower alkyl group; Z stand for CH.sub.2, O, S or NR.sub.9 ; and R.sub.9 stands for a hydrogen atom or a lower alkyl group.

Heat transfer sheets

A heat transfer sheet for use with a sublimation-type heat transfer printing method, capable of producing a high-quality image having high preservability, including a substrate sheet, and a dye layer which is formed on one surface of the substrate sheet, the dye layer containing a sublimable dye represented by the formula (I) shown below. ##STR1##

A heat transfer sheet including (i) a substrate sheet, and (ii) a dye layer which is formed on one surface of the substrate sheet, and includes a binder and a sublimable dye represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different and may form together a five- or six-membered ring which may contain an oxygen atom or a nitrogen atom, are a substituted or unsubstituted alkyl, cycloalkyl, aralkyl or aryl group; R.sub.3 is hydrogen, halogen, a cyano group, or a substituted or unsubstituted alkyl, cycloalkyl, alkoxyl, aralkyl, aryl, acyl, acylamino, sulfonylamino, ureido, carbamoyl, sulfamoyl or amino group; R.sub.4 is hydrogen, halogen, a cyano group, or a substituted or unsubstituted alkyl, cycloalkyl, alkoxyl, aralkyl, aryl, acyl, acylamino, sulfonylamino, ureido, carbamoyl, sulfamoyl, amino, heterocyclic or sulfonyl group; R.sub.5 is hydrogen, or a substituted or unsubstituted alkyl, cycloalkyl, alkoxyl, aralkyl, aryl, heterocyclic, acyl, sulfonyl, carbamoyl or sulfamoyl group; X is hydrogen, or an atom or atomic group which forms a five- or six-membered ring together with R.sub.1 ; and m is an integer of 1 or 2.

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Tokyo, Japan

Koumei Kafuku