JPH05169860A - Dyestuff for thermal transfer recording, ink composition for thermal transfer recording and transfer sheet - Google Patents

Abstract

PURPOSE:To obtain dyestuffs and an ink composition for thermal transfer recording having high sublimating speed and excellent image stability after transfer by using dyestuffs being shown in specific chemical formula and having superior solubility to an ink solvent and the low melting point as sublimating dyestuffs for thermal transfer recording. CONSTITUTION:In a thermal transfer recording system using sublimating dyestuffs, a transfer sheet, in which a base film is coated with sublimating dyestuffs, is employed, and the transfer sheet is heated selectively by a thermal head, thus conducting transfer on recording paper. Dyestuffs shown in general formula mentioned on the right are used as the sublimating dyestuffs at that time. In formula, R<1>, R<2> represent a hydrogen atom, a substituted or non- substituted alkyl group, an alkoxy group, etc., R<3>, R<4> the hydrogen atom, a 1-4C alkyl group or a halogen atom, R<5>-R<8> the hydrogen atom, the 1-4C alkyl group, etc., R<9>, R<10> the hydrogen atom, the substituted or non-substituted alkyl group, etc. The dyestuffs are kneaded with a binder resin, an organic solvent, etc., thus acquiring an ink composition for thermal transfer recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dye for thermal transfer recording (hereinafter abbreviated as sublimation dye), a thermal transfer recording ink composition, and a transfer sheet which are used for color hard copy by a sublimation thermal transfer recording system. Regarding

[0002]

2. Description of the Related Art In a thermal transfer system using a sublimation dye, a sublimation dye which is made into an ink is applied to a thin condenser paper or PET film having a thickness of several microns, and this is selectively heated by a thermal head and transferred to a recording paper. It is one of the thermal transfer printing methods, and is currently used as a means for recording various types of image information (hard copy).

The sublimation dyes used here are characterized by abundant colors, excellent color mixing properties, strong dyeing power, and relatively high stability, but the amount of dyes that sublime depends on heat energy, Since the density after dyeing can be controlled in an analog manner, it has a great feature not found in other printing methods.

An indoaniline-based compound, which has been particularly attracting attention as a cyan sublimation dye (Japanese Patent Application Laid-Open No. 61-2)
2993 and JP-A-61-31292), very few have both a high sublimation rate and image stability after transfer, and it has been expected that dyes satisfying optimum conditions as sublimation dyes will appear.

[0005]

DISCLOSURE OF THE INVENTION As a result of intensive studies made by the present inventors in order to solve the above problems, generally, in sublimation transfer dyes, the sublimation rate at the time of transfer depends on the interaction between the dye molecules. , And found that it is related to the interaction between the dye molecule and the binder resin for ink.

That is, it is preferable that the dye has good solubility in the ink solvent and has a low melting point, and that the interaction with the binder resin for the ink is small enough not to impair the storage stability after ribbon production. It became clear that it was a different pigment. Then, the dye represented by the general formula (I) of the present invention, which will be described later, has been found to have the above-mentioned various conditions and to obtain a relatively good sublimation rate, and has completed the present invention. The purpose is to provide a dye for thermal transfer recording which solves the above problems, the same ink composition,
And to provide a transfer sheet.

[0007]

The present invention has the following general formula (I) in order to solve the above problems.

[0008]

[Chemical 2] [Wherein R ¹ and R ² represent a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an alkenyl group, or an aralkyl group, and R ³ and R ⁴ represent A hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a halogen atom, R ^{5 to} R ⁸ represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an alkylcarbonylamino group, an alkoxycarbonylamino group, Formylamino group, alkylsulfonylamino group,
Or a halogen atom, R ^{9 to} R ¹⁰ represent a hydrogen atom, a substituted or unsubstituted alkyl group, an aralkyl group, an alkenyl group, or an aryl group, and n represents an integer of 0 to 8]. Is a dye for thermal transfer recording.

The present invention also comprises an ink composition for thermal transfer recording containing at least a dye for thermal transfer recording represented by the general formula (I), a binder resin, an organic solvent and / or water. is there.

The present invention is also a transfer sheet comprising a base sheet and a dye carrying layer formed on one surface of the base sheet, wherein the dye contained in the dye carrying layer is the above dye.

The present invention will be described in detail below.

The dye for thermal transfer recording of the present invention is a compound represented by the above general formula (I), wherein R ¹ and R ² are a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group, an alkoxy group, A cycloalkyl group, an aryl group, an alkenyl group, or an aralkyl group is shown.

The unsubstituted alkyl group has 1 to 1 carbon atoms.
8 straight or branched alkyl groups such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, i
so-butyl, sec-butyl, tert-butyl, n
-Pentyl, n-hexyl, n-heptyl, n-octyl and the like.

The substituted alkyl group has 1 to 6 carbon atoms.
Hydrogen on the linear or branched alkyl group of is an alkoxy group, an alkoxyalkoxy group, an aryloxy group, a thioaryloxy group, an alkylcarbonylamino group, an alkoxycarbonylamino group, a formylamino group, an alkylcarbonyl group, Examples thereof include groups substituted with an alkoxycarbonyl group, an alkylcarboxy group, an alkoxycarboxy group, an alkoxycarbonylalkoxy group, a halogen atom, or a cyano group.

The alkoxy group preferably has 1 to 8 carbon atoms, and examples thereof include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy and n-.
Hexyloxy and the like.

The alkoxyalkoxy group preferably has 1 to 8 carbon atoms, for example, methoxymethoxy,
There are methoxyethoxy, ethoxyethoxy, methoxypropoxy, ethoxypropoxy, propoxypropoxy and the like.

As the aryloxy group, phenoxy,
There are p-methylphenoxy, m-methylphenoxy, o-methylphenoxy, p-chlorophenoxy, m-methylphenoxy, o-methylphenoxy and the like.

As the thioaryloxy group, thiophenoxy, p-methylthiophenoxy, m-methylthiophenoxy, o-methylthiophenoxy and the like are preferable.

The alkylcarbonylamino group preferably has 1 to 6 carbon atoms, and examples thereof include methylcarbonylamino, ethylcarbonylamino, n-propylcarbonylamino, iso-propylcarbonylamino and n-butylcarbonylamino. ..

The alkoxycarbonylamino group is preferably one having an alkoxy group having 1 to 6 carbon atoms, for example, methoxycarbonylamino, ethoxycarbonylamino, n-propoxycarbonylamino, iso-propoxycarbonylamino, n-butoxycarbonylamino and the like. There is.

The alkylcarbonyl group is preferably an alkylcarbonyl group having 1 to 6 carbon atoms, such as methylcarbonyl, ethylcarbonyl, n-propylcarbonyl and is.
Examples thereof include o-propylcarbonyl and n-butylcarbonyl.

The alkoxycarbonyl group is preferably an alkoxycarbonyl group having 1 to 6 carbon atoms, and examples thereof include methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl, iso-propoxycarbonyl and n-butoxycarbonyl.

The alkylcarboxy group is preferably an alkylcarboxy group having 1 to 6 carbon atoms, such as methylcarboxy, ethylcarboxy, n-propylcarboxy and is.
Examples thereof include o-propylcarboxy and n-butylcarboxy.

The alkoxycarboxy group is preferably one having an alkoxy group having 1 to 6 carbon atoms, and examples thereof include methoxycarboxy, ethoxycarboxy, n-propoxycarboxy, iso-propoxycarboxy and n-butoxycarboxy.

The alkoxycarbonylalkoxy group is preferably an alkoxy group having 1 to 4 carbon atoms,
Examples thereof include methoxycarbonylmethoxy, ethoxycarbonylmethoxy, n-propoxycarbonylmethoxy, iso-propoxycarbonylmethoxy, and n-butoxycarbonylmethoxy.

The halogen atom is preferably fluorine, chlorine, bromine or the like.

The alkoxy group is preferably one having 1 to 8 carbon atoms, for example, methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-.
Butoxy, sec-butoxy, tert-butoxy, n
-Hexyloxy and the like.

As the cycloalkyl group, cyclopentyl, cyclohexyl and the like are preferable.

As the aryl group, phenyl, p-tolyl, m-tolyl, o-tolyl, p-chlorophenyl, m
-Chlorophenyl, o-chlorophenyl and the like are preferable.

The alkenyl group preferably has 2 to 6 carbon atoms, and examples thereof include allyl, 2-butenyl, 3-butenyl, 3-methyl-2-butenyl and the like.

The aralkyl group is preferably an alkyl group having 1 to 4 carbon atoms, and examples thereof include benzyl and phenethyl.

R ³ and R ⁴ represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a halogen atom.

Alkyl groups include methyl, ethyl, n
-Propyl, iso-propyl, n-butyl, iso-
Butyl, sec-butyl, tert-butyl and the like are preferable.

The halogen atom is preferably fluorine, chlorine, bromine or the like.

R ^{5 to} R ⁸ represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an alkylcarbonylamino group, an alkoxycarbonylamino group, a formylamino group, an alkylsulfonylamino group, or a halogen atom.

Here, as the alkyl group having 1 to 4 carbon atoms, methyl, ethyl, n-propyl, iso-propyl,
n-butyl, iso-butyl, sec-butyl, ter
A t-butyl group and the like are preferable.

The alkoxy group preferably has 1 to 8 carbon atoms, and examples thereof include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy and n-.
Hexyloxy and the like.

The alkylcarbonylamino group preferably has 1 to 6 carbon atoms, and examples thereof include methylcarbonylamino, ethylcarbonylamino, n-propylcarbonylamino, iso-propylcarbonylamino, n-butylcarbonylamino and the like. ..

As the alkoxycarbonylamino group,
The alkoxy group preferably has 1 to 6 carbon atoms, and examples thereof include methoxycarbonylamino, ethoxycarbonylamino, n-propoxycarbonylamino, iso-propoxycarbonylamino, and n-butoxycarbonylamino.

The alkylsulfonylamino group is preferably one having an alkyl group having 1 to 4 carbon atoms, such as methylsulfonylamino, ethylsulfonylamino, n-propylsulfonylamino, iso-propylsulfonylamino and n-butylsulfonylamino. Can be illustrated.

The halogen atom includes fluorine, chlorine, bromine and the like.

R ⁹ and R ¹⁰ represent a hydrogen atom, a substituted or unsubstituted alkyl group, an aralkyl group, an alkenyl group or an aryl group.

The unsubstituted alkyl group has 1 to 1 carbon atoms.
10 straight chain or branched alkyl groups such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, i
so-butyl, sec-butyl, tert-butyl, n
-Pentyl, n-hexyl, n-heptyl, n-octyl and the like.

The substituted alkyl group has 1 to 8 carbon atoms.
The hydrogen on the linear or branched alkyl group of is an alkoxy group, an alkoxyalkoxy group, an aryloxy group, a thioaryloxy group, an alkylcarbonylamino group, an alkoxycarbonylamino group, a formylamino group, an alkylcarbonyl group, an alkoxy group. Examples thereof include a group substituted with a carbonyl group, an alkylcarboxy group, an alkoxycarboxy group, an alkoxycarbonylalkoxy group, a halogen atom, or a cyano group.

The alkoxy group preferably has 1 to 8 carbon atoms, and examples thereof include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy and n-.
Hexyloxy and the like.

The alkoxyalkoxy group preferably has 1 to 6 carbon atoms, for example, methoxymethoxy,
There are methoxyethoxy, ethoxyethoxy, methoxypropoxy, ethoxypropoxy, propoxypropoxy and the like.

As the aryloxy group, phenoxy,
There are p-methylphenoxy, m-methylphenoxy, o-methylphenoxy, p-chlorophenoxy, m-methylphenoxy, o-methylphenoxy and the like.

As the thioaryloxy group, thiophenoxy, p-methylthiophenoxy, m-methylthiophenoxy, o-methylthiophenoxy and the like are preferable.

The alkylcarbonylamino group preferably has 1 to 6 carbon atoms, and examples thereof include methylcarbonylamino, ethylcarbonylamino, n-propylcarbonylamino, iso-propylcarbonylamino, n-butylcarbonylamino and the like. ..

The alkoxycarbonylamino group is preferably one having an alkoxy group having 1 to 6 carbon atoms, for example, methoxycarbonylamino, ethoxycarbonylamino, n-propoxycarbonylamino, iso-propoxycarbonylamino, n-butoxycarbonylamino and the like. There is.

The alkylcarbonyl group is preferably an alkylcarbonyl group having 1 to 6 carbon atoms, such as methylcarbonyl, ethylcarbonyl, n-propylcarbonyl and is.
Examples thereof include o-propylcarbonyl and n-butylcarbonyl.

The alkoxycarbonyl group preferably has an alkoxy group having 1 to 6 carbon atoms, and examples thereof include methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl, iso-propoxycarbonyl and n-butoxycarbonyl.

The alkylcarboxy group is preferably one having an alkyl group having 1 to 6 carbon atoms, such as methylcarboxy, ethylcarboxy, n-propylcarboxy and is.
Examples thereof include o-propylcarboxy and n-butylcarboxy.

The alkoxycarboxy group is preferably one having an alkoxy group having 1 to 6 carbon atoms, and examples thereof include methoxycarboxy, ethoxycarboxy, n-propoxycarboxy, iso-propoxycarboxy and n-butoxycarboxy.

The alkoxycarbonylalkoxy group is preferably an alkoxy group having 1 to 6 carbon atoms,
Examples thereof include methoxycarbonylmethoxy, ethoxycarbonylmethoxy, n-propoxycarbonylmethoxy, iso-propoxycarbonylmethoxy, and n-butoxycarbonylmethoxy.

The halogen atom is preferably fluorine, chlorine, bromine or the like.

The aralkyl group is preferably an alkyl group having 1 to 4 carbon atoms, and examples thereof include benzyl and phenethyl.

The alkenyl group preferably has 2 to 6 carbon atoms, and examples thereof include allyl, 2-butenyl, 3-butenyl and 3-methyl-2-butenyl.

Examples of the aryl group include phenyl, p-tolyl, m-tolyl, o-tolyl, p-chlorophenyl and m.
-Chlorophenyl, o-chlorophenyl and the like are preferable.

Further, n represents an integer of 0-8.

The dye represented by formula (I) of the present invention can be obtained by an oxidative bond between a substituted aniline and a substituted phenol by a conventional method.

[0062]

[Chemical 3] However, X represents a leaving group such as H or halogen.

As a method for producing a thermal transfer recording ink using the dye of the present invention, the dye may be mixed with an appropriate resin, solvent or the like to prepare the recording ink.

In this case, the amount of the dye in the thermal transfer recording ink is usually 2 to 5% by weight.

As a thermal transfer method, the ink obtained above is applied onto a suitable base material sheet to prepare a transfer sheet, the transfer sheet is superposed on a recording medium, and then heat-sensitive recording is performed from the rear surface of the transfer sheet. A method of heating and pressurizing with a head can be mentioned, and by doing so, the dye on the transfer sheet is transferred onto the recording material.

The resin for adjusting the above-mentioned ink may be one used in ordinary printing inks, such as rosin type, phenol type, xylene type, petroleum type, vinyl type, polyamide type, alkyd type, nitrocellulose. Oil-based resins such as resins and alkyl celluloses, or aqueous resins such as maleic acid-based, acrylic acid-based, casein, shellac and glue can be used.

As a solvent for ink preparation, alcohols such as methanol, ethanol, propanol and butanol, cellosolves such as methyl cellosolve and ethyl cellosolve, aromatics such as benzene, toluene and xylene, ethyl acetate, Esters such as butyl acetate, acetone, methyl ethyl ketone, ketones such as cyclohexanone, hydrocarbons such as ligroin, cyclohexane and kerosene, dimethylformamide and the like can be used, but when using an aqueous resin, water or water and the above It is also possible to mix and use the above solvents.

As the base material sheet to which the ink is applied, thin paper such as condenser paper and glassine paper, and plastic film having good heat resistance such as polyester, polyamide and polyimide are suitable. In order to improve the heat transfer efficiency from the thermal recording head to the dye, a thickness of about 5 to 50 μm is suitable.

The dye-carrying layer provided on the surface of the base sheet can be prepared by applying the above-mentioned ink to the base sheet.

Examples of the recording material include polyolefin resins such as polyethylene and polypropylene, halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, vinyl polymers such as polyvinyl alcohol, polyvinyl acetate and polyacrylic ester. Polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins,
Copolymer resins of olefins such as ethylene and propylene and other vinyl monomers, cellulosic resins such as ionomers, cellulose diacetate and cellulose triacetate, fibers made of polycarbonate, polysulfone, polyimide, woven fabrics, films, sheets, molding Things etc. are mentioned.

Particularly preferred are woven fabrics, sheets or films made of polyethylene terephthalate.

Further, in the present invention, the resin to which acidic fine particles such as silica gel are added is coated on plain paper, impregnated with it, laminated with resin film, or specially treated with acetylation. By using paper, good recording with excellent image stability under high temperature and high humidity can be performed. It is also possible to use films of various resins or synthetic papers made from them.

Further, after transfer recording, a polyester film, for example, is hot-pressed and laminated on the transfer recording surface, whereby the coloring of the dye can be improved and the storage stability of the recording can be achieved.

[0074]

The cyan dye represented by the general formula (I) of the present invention can control the sublimation transfer amount of the dye by changing the energy applied to the thermal head during thermal transfer. Easy and suitable for full color recording.

Further, since it is stable against heat, light, moisture, chemicals, etc., it is not thermally decomposed during transfer recording and the obtained record is excellent in storability.

Further, since the dye of the present invention has good solubility in an organic solvent and dispersibility in water, it is easy to prepare a highly concentrated ink that is uniformly dissolved or dispersed, and as a result, the color density is increased. It is a dye that is practically valuable because it can obtain good recording quality.

[0077]

EXAMPLES The present invention will be described in detail below with reference to examples.
Parts in the examples indicate parts by weight. % Means% by weight. Example-1 Synthesis of the following compound (A) was carried out using 4-diethylamino-o-
Toluidine 10 parts and 2-acetocarbonylamino-4-
While dissolving 13 parts of chloro-5-acetylaminophenol in 120 parts of methanol, 27% of 25% ammonia water was added.
After dropwise addition of 24 parts, 24 parts of ammonium persulfate was added over about 1 hour while maintaining the liquid temperature at 20 ° C., and the mixture was reacted at room temperature for 2 hours.

After the reaction, the precipitated product was filtered, washed well with water, and purified by column chromatography to obtain the desired product (A).

Further, by using the compound of the following formula (A), ink adjustment, a transfer sheet and a recording material were prepared and transfer recording was carried out as follows.

The maximum absorption wavelength (λmax) of the compound in chloroform was 624 nm.

[0081]

[Chemical 4] (I) Ink preparation method Dye of the above formula (A) 3 parts Polybutyral resin 4.5 〃 Methyl ethyl ketone 46.25 〃 Toluene 46.25 〃 The dye mixture of the above composition is used in a glass conditioner with a paint conditioner for about 30 parts. The ink was prepared by mixing for a minute. (Ii) Method for preparing transfer sheet Using a gravure proofing machine (plate depth: 30 μm), a dry coating amount of 1.0 g / m ² was applied to a 9 μm-thick polyethylene terephthalate film whose back surface was heat-treated with the above ink. And then dried. (Iii) Preparation of recording material Polyester resin 0.8 part (Vylon 103 Toyobo Tg = 47 ° C.) EVA polymer plasticizer 0.2 part (Elvalloy 741p Mitsui Polychemical Tg = −37 ° C.) Amino-modified silicone 0.04 parts (KF-857 manufactured by Shin-Etsu Chemical Co., Ltd.) Epoxy-modified silicone 0.04 parts (KF-103 manufactured by Shin-Etsu Chemical Co., Ltd.) Methyl ethyl ketone / toluene / cyclohexane (weight ratio 4: 4: 2) 9.0 parts Then, adjust the coating liquid and make synthetic paper (Oji Yuka,
YUPO FPG 150) with a bar coater (RK Prin)
Manufactured by t Coat Instruments, N
o. 1) was applied at a rate of 4.5 g / m ² when dried, and dried at 100 ° C. for 15 minutes. (Iv) Transfer recording The transfer sheet and the recording material are overlapped with the ink application surface and the coating liquid application surface facing each other, and the thermal head applied voltage of 10 V and the printing time from the back surface of the transfer sheet. Recording was carried out under the condition of 0 milliseconds to obtain a cyan color recording having a color density of 1.90.

The color density is densitometer RD-514 manufactured by Macbeth Co., USA (filter: Ratten N).
o. 58).

The color density was calculated by the following formula.

Color Density = log ₁₀ (Io / I) Io = Intensity of Light Reflected from Standard White Reflector I = Intensity of Light Reflected from Test Object In addition, the light fastness test of the obtained recording was xenon faded. It was carried out at a black panel temperature of 63 ± 2 ° C. using a meter (manufactured by Suga Test Instruments Co., Ltd.), but it was not discolored by irradiation for 40 hours, and the stability of the image under high temperature and high humidity was excellent.

Further, the fastness of the recorded image obtained is 50 ° C.
After being left for 48 hours in the atmosphere, the image was sharp and the surface was rubbed with white paper, and the color was evaluated.
The sharpness of the image did not change, the white paper was not colored, and the fastness of the recorded image was good. Example-2 Synthesis of the following compound (B) was carried out using p-diethylamino-o-
11 parts of toluidine and 14 parts of 2-acetoethylcarbonylamino-4-chloro-5-acetylaminophenol were dissolved in a mixed solution of 63 parts of methanol and 38 parts of water,
27 parts of 25% ammonia water was added, the liquid temperature was kept at 20 ° C., and 76.6 parts of 25% silver nitrate aqueous solution was added dropwise thereto in about 1 hour and reacted at room temperature for 2 hours. After the reaction, the product was extracted with chloroform, washed well with water, and purified by column chromatography to obtain the desired product (B).

The maximum absorption wavelength (λmax) of the compound in chloroform was 623 nm.

[0087]

[Chemical 5] Ink adjustment, a transfer sheet and a recording material were prepared and transfer recording was performed in the same manner as in Example 1 to obtain a cyan recording having a color density of 1.90.

All of these recordings were subjected to the light resistance test by the same method as in Example-1. As a result, the recordings hardly changed and the stability of the image under high temperature and high humidity was excellent.

A fastness test was conducted in the same manner as in Example 1, but the sharpness of the image did not change, the white paper was not colored, and the fastness of the recorded image was good. Examples-3 to 24 The cyan dyes shown in Table-1 were produced according to the same method as in Example-1, and similarly ink adjustment, transfer sheet preparation, recording material preparation, and transfer recording were performed. Each record shown in Table-1 was obtained.

All of these recordings were subjected to the light resistance test by the same method as in Example-1. As a result, the recordings hardly changed and the stability of the image under high temperature and high humidity was excellent.

A fastness test was conducted in the same manner as in Example 1, but the sharpness of the image did not change, the white paper was not colored, and the fastness of the recorded image was good.

Table 1 shows the measurement results of the maximum transfer density, the light fastness and the determination results of the fastness.

[0093]

[Table 1]

[0094]

[Table 2]

[0095]

[Table 3]

[0096]

[Table 4] The judgment results of light resistance and fastness are shown by O for good and X for bad.

Comparative Example For the compounds shown in Table 2, ink was prepared, a transfer sheet was prepared, a recording material was prepared, and transfer recording was carried out in the same manner as in Example-1. Further, a light resistance test and a fastness test were performed in the same manner as in Example-1.

The results are also shown in Table 2.

[0099]

[Table 5] The judgment results of light resistance and fastness are shown by O for good and X for bad.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Koshida 12-5-510 Koshienguchi Kitamachi, Nishinomiya-shi, Hyogo (72) Inventor Keisuke Soma 300 Hirahara-cho, Omuta-shi, Fukuoka (72) Ryohei Takiguchi Shinjuku, Tokyo 1-1-1 Ichigaya-Kagacho, Ichi-ku Dai-ni Printing Co., Ltd. (72) Inventor Hiroshi Eguchi 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai-ni Printing Co., Ltd. (72) Inventor Kimiaki Kafuku Tokyo 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd.

Claims (3)

[Claims] 1. The following general formula (I): [Wherein R ¹ and R ² represent a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an alkenyl group, or an aralkyl group, and R ³ and R ⁴ represent A hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a halogen atom, R ^{5 to} R ⁸ represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an alkylcarbonylamino group, an alkoxycarbonylamino group, Formylamino group, alkylsulfonylamino group,
Or a halogen atom, R ^{9 to} R ¹⁰ represent a hydrogen atom, a substituted or unsubstituted alkyl group, an aralkyl group, an alkenyl group, or an aryl group, and n represents an integer of 0 to 8]. Dye for thermal transfer recording. 2. A heat-sensitive transfer recording ink comprising at least a heat-sensitive transfer recording dye represented by the general formula (I) according to claim 1, a binder resin, an organic solvent and / or water. Composition. 3. A base sheet and a dye-supporting layer formed on one surface of the base sheet, wherein the dye contained in the dye-supporting layer has the sensation represented by the general formula (I). A transfer sheet characterized by being a dye for thermal transfer recording.