JP3293003B2 - Recording material and image forming method using metal ion supply compound for thermal transfer image formation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer type image recording material using a metal ion supplying compound and an image forming method using the recording material.

[0002]

2. Description of the Related Art As means for forming a color image by transferring a dye to an image receiving element using heat, there are known means using a diffusion transfer type photothermographic material and means using a heat-sensitive transfer material. I have. In these systems, the dye is transferred by thermal energy. Therefore, when the sensitivity is to be increased (transfer time is to be shortened), the sensitivity can be increased by thermally diffusing the dye.

[0003] However, these highly diffusible dyes have the disadvantage that the image after transfer has a reduced image density due to re-diffusion during storage, or the dye is insufficiently fixed and is easily bleeding.

In order to solve these problems, there has been proposed a method in which a mordant of a dye is added to an image receiving element or a reaction with the dye promotes fixing. Among these, means for transferring a dye to an image receiving element by heating a heat-sensitive transfer material containing a heat-diffusable dye capable of being chelated, and forming a chelate dye with a metal ion supply compound in the image receiving element is disclosed in It is proposed in 78893 and 60-2398. Japanese Patent Application Laid-Open (JP-A) No. 3-97088 describes a metal ion supply compound with improved solubility, but does not have sufficient reactivity.

[0005]

According to the above-mentioned means, although a reduction in image density is prevented and an effect of improving the fixability of the dye is observed, the metal ion-supplying compound must be present in a stable dispersion state in the image receiving element. Is difficult.
In particular, when a heat-diffusible dye is received, when a metal ion-supplying compound is added to a hydrophobic binder, which is a preferred binder, the compound precipitates or aggregates. Occurs and the image quality deteriorates. In addition, since the metal ion supply compound itself is colored, a white background portion of the image is colored, resulting in a decrease in image quality. In addition, when the chelation reaction between the metal ion and the dye is incomplete, the color tone of the dye differs before and after chelation,
It is not preferable in color reproduction. So, to complete the reaction,
A high temperature or a long time heating is required after image formation by transfer, which has a disadvantage that the image forming apparatus is complicated and expensive.

The present invention has been made to improve these points.

[0007] A first object of the present invention is to provide a recording material in which a metal ion supplying compound can be stably dispersed in a binder.

A second object of the present invention is to provide a recording material in which the white background is less contaminated and the chelation reaction proceeds rapidly, and an image forming method using the recording material.

A third object of the present invention is to provide a thermal transfer type recording for forming a color image having a high density and a good gradation even on an image receiving material such as plain paper having no image receiving layer. An object of the present invention is to provide a material and an image forming method using the recording material.

[0010]

The object of the present invention is to provide: (1) a thermal transfer type image recording material containing a metal ion supply compound represented by the general formula [I]; and (2) a thermal transfer type image recording material represented by the general formula [I]. An image comprising a chelate dye formed by the reaction between the metal ion supply compound represented by the general formula [I] and the chelatable dye is heated according to the image information in the presence of the metal ion supply compound. This is achieved by an image forming method characterized in that the image is formed.

Hereinafter, the present invention will be described specifically.

In the compound represented by the above general formula [I] (hereinafter referred to as the compound of the present invention), M ²⁺ represents a divalent transition metal ion. Nickel and zinc are preferred because of the color of the chelated dye. X represents a coordination compound represented by the general formula [II] capable of forming a complex with a divalent metal ion. Further, the compound of the present invention may have a neutral ligand depending on the central metal, and typical ligands include H ₂ O or NH ₃ .

In the compound represented by the general formula [II], Z represents an alkyl group, an aryl group, an alkoxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a halogen atom or a hydrogen atom. Z is preferably an electron-withdrawing group such as an aryloxycarbonyl group, an alkoxycarbonyl group, or a halogen atom for stabilizing the metal ion-supplying compound. Among them, an aryloxycarbonyl group and an alkoxycarbonyl group are more preferable in terms of solubility. . Examples of the aryloxycarbonyl group include a phenoxycarbonyl group, and examples of the alkoxycarbonyl group include methoxycarbonyl, ethoxycarbonyl, pentyloxycarbonyl, and 2-ethylhexyloxycarbonyl groups having 1 to 20 carbon atoms. And the alkoxycarbonyl group may be substituted with a halogen atom, an aryl group, an alkoxy group, or the like.

R and R 'represent an alkyl group and an aryl group, which may be the same or different, and R and Z or R' and Z may combine to form a ring;
When R is a hydrogen atom, neither R nor R 'is a methyl group. Examples of the alkyl group represented by Z, R and R ′ include methyl, ethyl, propyl, isopropyl,
Butyl, sec-butyl, t-butyl, hexyl, octyl,
Examples thereof include linear or branched alkyl groups having 1 to 20 carbon atoms such as a 2-ethylhexyl group, and these alkyl groups may be substituted with a halogen atom, an aryl group, an alkoxy group, or the like. . The aryl group represented by Z, R and R 'includes a phenyl and naphthyl group, and may have a substituent. Examples of the alkoxy group represented by Z include straight-chain or branched alkoxy groups having 1 to 20 carbon atoms, such as methoxy, ethoxy, and butoxy. As the acyl group represented by Z, acetyl, propionyl, chloroacetyl, phenacetyl,
A benzoyl group and the like can be mentioned. The halogen atom represented by Z is preferably a chlorine atom.

The amount of the compound of the present invention used in the present invention is usually preferably 0.5 to 20 g / m ² , more preferably ¹ to 15 g / m ² , based on the support.

The following are examples of compounds, but the present invention is not limited to them.

[0017]

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[0018]

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[0019]

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[0020]

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[0021]

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[0022]

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[0023]

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The compound represented by the above general formula can be synthesized according to the method described in Chelate Chemistry (5) Experimental Method for Complex Chemistry [I] (edited by Nankodo).

A preferred embodiment of the image recording material of the present invention is an image recording material using an image receiving layer having at least one binder and a compound of the present invention represented by the general formula [I] on a support. (Hereinafter, an image recording material using an image receiving layer containing the compound of the present invention is referred to as an image receiving material).

The binder used in the image receiving material may be any one having an ester bond, a urethane bond, an amide bond, a carbon bond, a sulfone bond, and other highly polar bonds. Representative examples thereof include polyester resin, polyvinyl chloride resin, Copolymer resin of vinyl chloride and other monomers (for example, vinyl acetate, etc.), polyacrylonitrile resin,
Polycaprolactone resin, polyvinyl butyral resin,
Examples thereof include a polyvinylpyrrolidone resin, a styrene-maleic anhydride resin, and a polyvinyl carbonate resin. One or more resins may be used in combination, or a copolymer may be used. Of these polymers, more preferred are polycarbonates containing a plasticizer described in JP-A-60-19138 and polyvinyl acetal-based polymers, particularly polyvinyl butyrals described in JP-A-61-11293. Support 1 m ² per 0.1g is used in an amount of the binder
~ 50 g is preferred.

As the support used for the image receiving material, any of a transparent support and an opaque support may be used. For example, polyethylene terephthalate, polycarbonate, polystyrene, polyvinyl chloride, polyethylene,
Films such as polypropylene, and supports in which pigments such as titanium oxide, barium sulfate, calcium carbonate, and talc are contained in these supports, baryta paper, RC paper in which a thermoplastic resin containing pigment is laminated on paper , Cloths, glasses, metals such as aluminum, etc., and an electron beam-curable resin composition containing a pigment applied on these supports, and cured, and a pigment is applied on these supports. And a support provided with a coating layer containing Further, the cast-coated paper described in JP-A-62-28333 is also useful as a support.

The image receiving material may be composed of two or more layers for the purpose of improving fixability and sensitivity. In this case, it is preferable that a layer closer to the support (hereinafter, referred to as a lower layer) has higher dye receptivity than a layer farther (hereinafter, referred to as an upper layer). Also, the layer on the side close to the support and the outermost layer use a resin having a different glass transition point, or change the addition amount of a high boiling point solvent or a thermal solvent described in JP-A-3-256795 to improve image stability after transfer. (For example, non-retransferability) can be improved. The compound of the present invention can be added to the upper layer or the lower layer, but it is more preferable to add the compound to the lower layer for sensitivity.

The acceptability of the dye is evaluated by the following measuring method.

A coating solution is prepared by mixing one kind of binder used for the image receiving material at a ratio of 100: 1 with the dye so that the coating solution has a dry film thickness of 4 μm on a support. The first colored layer is provided by coating and drying, and then a coating liquid prepared with a resin binder different from the first colored layer and the dye used in the first colored layer is dried to a thickness of 4 μm.
A second colored layer is provided by coating and drying to a thickness of μm. After the colored layer laminated as described above was allowed to stand for 24 hours while being heated to 100 ° C., it was sliced to a thickness of 3 μm in a direction perpendicular to the laminating direction, and the cross-sectional layer was observed with a microtome. You can determine the level of acceptability.

When the compound of the present invention is used by adding it to an image receiving material, an ink sheet having a color material layer containing at least one chelatable dye on a support for image formation is used. . The chelatable dye used in the ink sheet may be any one capable of chelating with a metal ion.As such a dye, for example, JP-A-3-114892, JP-A-4-62092, JP-A-4-62094, Id 4-8289
No. 6, No. 5-16545, Japanese Patent Application Nos. 4-107778 and 4-167793. The content of the dye used in the present invention is preferably 0.1 g to ²⁰ g per 1 m2 of the support.

Preferred examples of the yellow dye include the following general formula [III].

[0033]

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[0034] In the formula, each R ₁ and R ₂ represents a hydrogen atom or a substituent, Y represents OR _3, SR ₃ or NR ₃ R _4, Z ₁
Represents an atomic group necessary for constituting a 5- to 6-membered aromatic ring together with two carbon atoms. R ₃ and R ₄ each represent an alkyl group or an aryl group which may have a substituent.

As the substituents represented by R ₁ and R ₂ ,
For example, a halogen atom (fluorine, chlorine, etc.), an alkyl group (methyl, i-propyl, t-butyl, trifluoromethyl, methoxymethyl, 2-methylsulfonylethyl, 2-methanesulfonamidoethyl, etc.), a cycloalkyl group (cyclopentyl) , Cyclohexyl, etc.), an aryl group (phenyl,
3-methylphenyl, 4-t-butylphenyl, 2-methoxyphenyl, 3-acetoaminophenyl, etc.), cyano group, acyl group, alkoxy group, aryloxy group, acylamino group, anilino group, ureido group, sulfamoyl Amino group, alkylthio group, arylthio group, alkoxycarbonylamino group, sulfonamide group, carbamoyl group,
Examples include a sulfamoyl group, a sulfonyl group, an alkoxycarbonyl group, a heterocyclic oxy group, a heterocyclic thio group, an acyloxy group, a carbamoyloxy group, a silyloxy group, an aryloxycarbonylamino group, an imide group, and a phosphonyl group.

As the alkyl group and the aryl group represented by R ₃ and R ₄ , the same as the alkyl group and the aryl group represented by R ₁ and R ₂ can be exemplified.

Examples of the 5- to 6-membered aromatic ring composed of Z and two carbon atoms include benzene, pyridine, pyrimidine, triazine, pyrazine, pyridazine, pyrrole, furan, thiophene, pyrazole, imidazole, triazole and oxazole. , A ring such as thiazole,
These rings may further form a condensed ring with another aromatic ring.

The magenta dye preferably has the following general formula [IV].

[0039]

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In the formula, R ₁₁ represents an alkyl group, a halogen atom or a hydrogen atom, R ₁₂ represents an alkyl group or a hydrogen atom, R ₁₃ and R ₁₄ each represent an alkyl group which may have a substituent, Represents an aralkyl group which may have a substituent or an aryl group which may have a substituent. However, R ₁₃
And at least one of R ₁₄ is an alkyl-substituted aryl group or an alkyl-substituted aralkyl group.

Examples of the halogen atom represented by R ₁₁ include chlorine and bromine, and examples of the alkyl group represented by R ₁₁ and R ₁₂ include methyl, ethyl and butyl. Examples of the alkyl group, aralkyl group and aryl group each of which may have a substituent represented by R ₁₃ and R ₁₄ include methyl,
Ethyl, propyl, i-propyl, butyl, sec-butyl,
Examples include pentyl, hexyl, methoxyethyl, ethoxycarbonylmethyl, benzyl, phenethyl, 4-methylbenzyl, phenyl, m-tolyl, p-tolyl and the like. Here, at least one of R ₁₃ and R ₁₄ is an alkyl-substituted aryl group (m-tolyl, 4-methoxyphenyl and the like) or an alkyl-substituted aralkyl group (methylbenzyl).

The cyan dye preferably has the following general formula [V].

[0043]

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In the formula, Z ₂₁ represents a group of atoms necessary for forming a substituted or unsubstituted aromatic ring, and Z ₂₂ represents a group for forming a substituted or unsubstituted thiazole ring, benzothiazole ring or pyridine ring, respectively. It represents a necessary atom group, and R ₂₁ represents an alkyl group which may be substituted.

The aromatic ring formed by Z ₂₁ is preferably a benzene ring or a naphthalene ring. The optionally substituted alkyl group represented by R ₂₁ is preferably a linear or branched alkyl group having 1 to 12 carbon atoms, such as methyl, ethyl, propyl, I-propyl, butyl, t-butyl, hexyl , 2-ethylhexyl, decyl, methoxyethyl, chloromethyl, 2-carboxyethyl, benzyl and the like.

The following formulas [III], [IV] and [V]
Representative examples of the dye represented by are shown below, but the invention is not limited thereto.

[0047]

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[0048]

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[0049]

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The binder used for the ink sheet includes water-soluble polymers such as cellulose, polyacrylic acid, polyvinyl alcohol and polyvinylpyrrolidone, acrylic resin, methacrylic resin, polystyrene, polycarbonate, polysulfone, polyethersulfone and polyvinyl butyral. , Polyvinyl acetal, ethyl cellulose, nitrocellulose, and other organic solvents. When a polymer soluble in an organic solvent is used, one or more of the polymers may be used in the form of a latex dispersion as well as being dissolved in an organic solvent.

The amount of the binder used is per 1 m ² of the support.
0.1 g to 50 g are preferred.

Another preferred embodiment of the image recording material of the present invention includes a colorant layer containing at least one chelatable dye on a support and a compound containing the compound of the present invention containing the compound of the present invention. And an image recording material comprising a layer (hereinafter, an image recording material using a color material layer and the compound-containing layer of the present invention is referred to as a transfer material). In the transfer material, the color material layer and the compound-containing layer of the present invention are
As described in JP-A-81195, it may be provided to be superimposed on a support, or as described in JP-A-4-329191, provided on a support in a plane-by-plane manner. You may. The coloring material layer used in the transfer material is prepared by dissolving a chelatable dye and a binder in a solvent, or by dissolving the binder alone or in an appropriate solvent, and then dispersing the binder into fine particles to prepare a coating solution. And coated on a support serving as a transfer material and dried.

The dye, binder and support used here can be the same as those used in the above-mentioned ink sheet.

The compound-containing layer of the present invention (hereinafter referred to as a transfer layer) used in the transfer material may be prepared by dissolving the compound of the present invention and a heat-fusible compound in a solvent, alone or in an appropriate solvent. Thereafter, a coating solution is prepared by dispersing the compound of the present invention on the fine particles, and the resulting solution is applied to a support serving as an image recording material and dried. As the heat-fusible compound used in the transfer layer, a colorless or white compound having a melting point of 65 to 130 ° C. is preferably used, for example, waxes such as carnauba wax, beeswax, candeli wax, stearic acid, and behenic acid. Higher fatty acids such as
Examples thereof include alcohols such as xylitol, amides such as acetamide and benzamide, and ureas such as phenylurea and diethylurea. These transfer layers may contain a polymer such as, for example, polyvinylpyrrolidone, polyvinyl butyral, and saturated polyester in order to enhance the retention of the dye. As the support used for the transfer material, any material can be used as long as it has good dimensional stability and can withstand heat during recording with a thermal head, such as condenser paper, thin paper such as glassine paper, polyethylene terephthalate, and polyethylene. A heat-resistant plastic film such as telenaphthalate, polyamide, or polycarbonate can be used. The thickness of the support is preferably from 2 to 30 μm, and the support may have an undercoat layer for the purpose of improving the adhesion to the binder and transferring the dye to the support, and preventing dyeing. .

The coloring material layer used in the present invention and the compound-containing layer of the present invention are coated on a support or provided on the support by a printing method such as a gravure method. The thickness of each layer is 0.1 to 20 μm, preferably 0.2 to 10 μm, as a dry film thickness.

In the transfer material, an intermediate layer can be provided between the compound-containing layer of the present invention and the support to promote the transfer of the compound-containing layer of the present invention. This intermediate layer is, for example,
It is preferable to add a release agent to the binder used in the dye layer, or to use a silicone resin, a fluorine resin or the like as a resin having excellent release properties. Examples of the release agent include silicone oils, phosphate surfactants, and fluorine surfactants described in JP-A-4-135793.

A preferred embodiment of the image forming method of the present invention will be described.

In the image forming method of the present invention, the above-described image receiving material and the above-mentioned ink sheet containing a chelatable dye are superposed and heated in accordance with image information, and the dye of the ink sheet is transferred to the image receiving material. An image is formed on the material by a chelate dye formed by a reaction between the dye and the compound of the present invention.

As another method, a transfer material having a heat-sensitive transfer layer containing both the above-mentioned compound of the present invention and a chelatable dye is used, and the heat-sensitive transfer layer of the transfer material and an image-receiving material (not having an image-receiving layer) are used. The transfer material is heated by superimposing the heat transfer layer, the heat-sensitive transfer layer is transferred to the image receiving material, and then the transferred heat-sensitive transfer layer is heated according to the image information to form a chelate dye image on the image receiving material. Alternatively, the heat-sensitive transfer layer and the image receiving material are overlapped and the transfer layer is heated according to image information, and the compound of the present invention and the dye are both transferred to the image receiving material to form a chelate dye image on the image receiving material. . As a heating method, a method using a thermal head is generally used,
Laser heating using current heating described in JP-A-59-123695 or a photothermal conversion element described in European Patent No. 454083 may be used.

After the image formation, the image receiving material may be further heated. In this case, since it is not necessary to perform imagewise heating, in addition to the above-described heating method, a hot stamp and a radiant energy (for example, using a xenon lamp) can be used.

[0061]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these embodiments.

Example 1 A coating solution for an image receiving layer was prepared using the compounds of the present invention and the comparative compounds shown in Table 1.

5.0 parts of polyvinyl butyral resin [S-LEC BX-1 manufactured by Sekisui Chemical Co., Ltd.] Metal ion supply compound 5.0 parts Methyl ethyl ketone 72.0 parts Cyclohexanone 18.0 parts After heating to form a uniform solution, the solution was allowed to stand until it reached room temperature, and the stability of the coating solution was examined. Next, this coating solution was coated on a paper support having both sides of paper laminated with polyethylene so as to have a dry film thickness of 3 μm, and then dried to prepare an image receiving material. The white background of the obtained image receiving material was measured using a densitometer (X-rite310TR). Table 1 shows the results.

It can be seen that the image receiving material using the compound of the present invention has excellent solubility, no precipitation, and a good white background.

[0065]

[Table 1]

(Note) Comparative 1 Ni (CH ₃ COCH ₂ COCH ₃ ) ₂ Comparative 2 Ni (C ₁₇ H ₃₅ COO) ₂ The meanings of the evaluation symbols in Table 1 are as follows.

Solubility ：: Dissolves when stirred at room temperature ：: Dissolves when heated △: Precipitation (dissolves when solvent amount is doubled) ×: Precipitation (does not dissolve even if solvent amount is doubled) Precipitation ：: No precipitation ×: Precipitation observed White background The white background of the image receiving layer was visually judged. ○: Good △: Slightly good ×: Poor Reactivity The image after transfer was placed in an oven at 100 ° C. for 1 minute, before and after heating. A change in color tone was visually determined. ：: good Δ: slightly good ×: poor Example 2 An ink of a uniform solution containing the heat-diffusable dye used in the present invention was obtained from a mixture having the following composition.

Magenta M-1 10 g Nitrocellulose resin 20 g Methyl ethyl ketone 400 ml <Preparation of dye-providing material> An ink containing the above-mentioned heat-diffusible dye was placed on a support made of a 4.5 μm-thick polyethylene terephthalate film, The dye-donating material according to the present invention is formed by applying and drying so that the coating amount after drying becomes 1.0 g / m ² to form a layer containing a heat-diffusible dye.
1 was produced. Note that a nitrocellulose layer containing a silicone-modified urethane resin (SP-2105, manufactured by Dainichi Seika) is provided on the back surface of the polyethylene terephthalate film as a sticking preventing layer.

The obtained dye-providing material and the image-receiving material prepared in Example 1 were overlaid so that the ink-coated surface and the image-receiving surface faced each other, and a thermal head was applied from the back of the dye-providing material to obtain the following recording conditions. The image was recorded. Table 1 shows the maximum reflection densities (Dmax) of the obtained images and the results of evaluating the chelate reactivity of the dye at each density.

The image receiving material using the compound of the present invention has a high maximum reflection density and is excellent. In addition, it can be seen that chelation proceeds regardless of the applied energy, and the reactivity is high.

(Recording conditions) Linear density of main scanning and sub-scanning: 8 dots / mm Recording power: 0.6 W / dot Heating time of head: Heating time is adjusted stepwise between 20 msec and 2 msec. Example 3 <Metal Preparation of transfer material containing ion-supplying compound> Thickness 4.
Using a wire bar on a 5 μm polyethylene terephthalate base, compound 26 of the present invention (coating weight 3.0 g / m ² ), an ultraviolet inhibitor (UV-1, coating weight 0.2 g / m ² ), an antioxidant (A
O-1, with the amount of 0.2 g / m ²⁾ and ethylene - vinyl acetate copolymer (20% content of vinyl acetate, with the amount of 0.5 g / m ²⁾ paraffin wax containing (with weight 2.5 g / m ₂₎ A methyl ethyl ketone dispersion was applied and dried to form a transferable layer. Note that a silicone-modified urethane resin (SP-2) was formed on the back of the polyethylene terephthalate base as an anti-sticking layer.
105, manufactured by Dainichi Seika Co., Ltd.).

[0072]

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<Transfer Image Recording Method> A transfer material containing the compound of the present invention is overlapped with a high-quality paper, and a thermal head is applied from the back side of the transfer material. did.

(Recording conditions) Recording density of main scanning and sub-scanning: 8 dots / mm Recording power: 0.6 W / dot Heating time: 3 msec Subsequently, the nitrocellulose resin of Example 2 was replaced with polyvinyl butyral resin by this image receiving material. The dye-providing material prepared so that the coating amount after drying was 0.8 g / m ² was changed, and a heat-sensitive head was applied from the back side of the dye-providing material, and heating was performed under the following conditions. A magenta image with excellent tonality was obtained.

(Recording conditions) Recording density of main scanning and sub-scanning: 8 dots / mm Recording power: 0.6 W / dot Heating time: Heating time is adjusted stepwise from 20 msec to 0.2 msec. Also showed no change in color tone, indicating sufficient reactivity.

Example 4 In place of the magenta dye of Example 2, a yellow dye (Y-
A dye-providing material was prepared using the cyan dye (C-1) and the image-receiving material prepared in Example 1 (Sample No. 6).
And a heating head was applied from the back side of the dye-providing material, and heating was performed in accordance with the image to produce a full-color sample. The obtained image was an image having a good surface condition because there was little white background contamination and the compound of the present invention did not precipitate.

[0077]

According to the present invention, a metal ion supplying compound is stably dispersed in a hydrophobic binder, a high-sensitivity recording material free from white background contamination can be obtained, a suitable image forming method can be provided, and the present invention can also be applied to plain paper.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Daiwa Komamura Examiner, Isao Fujii, Konica Co., Ltd., 1 Konica Co., Ltd., Hino-shi, Tokyo (56) References JP-A-4-97894 (JP, A) JP-A-Hei 4-176686 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41M 5/38-5/40

Claims (4)

(57) [Claims] 1. A thermal transfer type image recording material comprising a metal ion supplying compound represented by the following general formula [I]. General formula [I] M ²⁺ (X ⁻ ) ₂ [wherein, M ²⁺ represents a divalent transition metal ion. X is divalent
Can form a complex with a metal ion of the following general formula
It represents the coordination compound represented by [II]. ] [Of A] [Wherein, Z is an alkyl group, an aryl group, an alkoxy group,
Acyl group, alkoxycarbonyl group, aryloxyca
Rubonyl group, carbamoyl group, halogen atom or hydrogen
Represents an atom. R and R 'are alkyl groups or aryl
Represents a group, which may be the same or different,
Z or R 'and Z may combine to form a ring,
Is a hydrogen atom, R and R 'are both methyl groups
Never. ] 2. A dye capable of being heated according to image information in the presence of a metal ion supplying compound represented by the following general formula [I] and chelating with the metal ion supplying compound represented by the following general formula [I]: An image comprising a chelate dye formed by the reaction with General formula [I] M ²⁺ (X ⁻ ) ₂ [wherein, M ²⁺ represents a divalent transition metal ion. X represents a coordination compound represented by the following general formula [II] that can form a complex with a divalent metal ion. [Formula 1] [Wherein, Z is an alkyl group, an aryl group, an alkoxy group,
Represents an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a halogen atom or a hydrogen atom. R and R 'represent an alkyl group or an aryl group, which may be the same or different, and R and Z or R' and Z may combine to form a ring;
Is a hydrogen atom, then R and R 'are not both methyl groups. ] 3. The method according to claim 1, wherein Z in the general formula [II] is an aryloxy.
It must be a cicarbonyl group or an alkoxycarbonyl group.
The thermal transfer type image recording material according to claim 1, wherein
Fees. 4. A method according to claim 1, wherein Z in said general formula [II] is aryloxy.
It must be a cicarbonyl group or an alkoxycarbonyl group.
3. The image forming method according to claim 2, wherein: