JP3243650B2 - Heat mode thermal transfer recording material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat mode thermal transfer recording material, and more particularly to a heat mode thermal transfer recording material capable of obtaining a transferred image having good color reproducibility by a light source such as a laser.

[0002]

BACKGROUND OF THE INVENTION Conventionally, as a thermal transfer recording method, a pressurized heating method using a thermal head has been put into practical use. In recent years, as a method capable of recording a higher resolution image, a laser beam has been irradiated onto a thermal transfer recording material. A system in which a laser beam is converted into heat in the recording material to perform thermal transfer recording has been used. This laser thermal transfer recording method (heat mode thermal transfer recording method) can condense the laser beam used for energy supply to a few microns, so the resolution is dramatically higher than the thermal transfer recording method that supplies heat with a thermal head. Improvement is possible.

However, when a color image is to be obtained by using the heat mode thermal transfer recording method, a large amount of local energy given by the laser is transferred (scattered) of the light-to-heat converting material contained in the heat mode thermal transfer recording material. And the transfer image becomes turbid.

JP-A Nos. 2-2074, 3-34891 and 3-36094
No.3, etc. disclose a technique relating to a light-to-heat conversion material, but all use a sublimable dye, and basically transfer only the dye, and there is no clear description of the presence of the light-to-heat conversion layer. No mention is made of the use of water-soluble coloring materials.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat mode in which an explosive phenomenon due to thermal decomposition, thermal melting, and the like is suppressed even when local high energy is applied, and the light-to-heat conversion layer itself is not transferred. An object of the present invention is to provide a thermal transfer recording material.

Another object of the present invention is to provide a heat mode thermal transfer recording material which has a sensitivity suitable for laser light and the like, has no color turbidity of a transferred image, and can obtain an image having excellent color reproducibility. It is in.

[0007]

The present inventors have made intensive studies and have found that the above object of the present invention can be achieved by forming the light-to-heat conversion layer of the thermal transfer recording material to have a high heat resistance, thereby completing the present invention.

(1) A heat mode thermal transfer recording material having a light-heat conversion layer containing at least a water-soluble coloring material and an ink layer on a support.

(2) The heat mode thermal transfer recording material as described in (1), wherein the water-soluble coloring material is soluble in water in an amount of 0.1% by weight or more.

(3) The water-soluble coloring material contains a sulfo group (1)
The heat mode thermal transfer recording material as described in the above.

(4) The heat-mode thermal transfer recording material according to (1), wherein the water-soluble coloring material is a near-infrared absorbing dye having an absorption peak in long-wavelength light of 700 nm or more.

(5) The heat mode thermal transfer recording material according to (1), wherein the light-to-heat conversion layer contains a water-soluble binder or an aqueous emulsion resin.

(6) The heat mode thermal transfer recording material according to (1), wherein the thickness of the light-to-heat conversion layer is 1.0 μm or less, and the transmittance of the light-to-heat conversion layer at an absorption peak at a wavelength of 700 nm or more is 10% or less. .

(7) The thickness of the ink layer is 1.0 μm or less
The heat mode thermal transfer recording material according to (1).

Hereinafter, the present invention will be described in more detail.

The heat mode thermal transfer recording material (hereinafter, also simply referred to as "recording material") is basically a material in which a light-to-heat conversion layer containing a light-to-heat conversion substance and an ink layer are laminated on a support in this order. Further, an intermediate layer (cushion layer, release layer, barrier layer, etc.) may be provided between the light-heat conversion layer and the ink layer.

In the present invention, a water-soluble coloring material is used as a light-to-heat conversion substance that performs a light-to-heat conversion action. Water-soluble coloring materials include sulfo groups (—SO ₃ H) and carboxyl groups (—CO 3
OH), those containing a bond such as a sulfonamide or a carbonamide, such as an acid group such as a phosphono group (—PO ₃ H ₂ ), and those having a sulfo group are particularly preferable.

The coloring material varies depending on the light source.
A substance that absorbs light and efficiently converts it to heat is preferable. For example, when a semiconductor laser is used as a light source, a substance that absorbs near infrared light is preferable. For example, various cyanine dyes, anthraquinone type, indoaniline metal complex type, azurenium type, croconium type, squarium type, dithiol metal complex type, chelate type, naphthalocyanine metal complex type dyes and the like can be used. Among them, dyes represented by the following general formulas (1) to (12) are preferable.

[0019]

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In the general formulas (1) and (2), Z ₁ and Z ₂ each represent a substituted or unsubstituted pyridine ring, a substituted or unsubstituted quinoline ring, a substituted or unsubstituted benzene ring, or a substituted or unsubstituted (In the case where Z ₁ and Z ₂ represent a pyridine ring or a quinoline ring, a ＝ N ⁺ (R ₁ ) -bond or -N (R ₆ )-
A bond may be included in Z ₁ or Z ₂ . ).

[0021] Z ₃ and Z ₄ each represents an atomic group necessary to form a quinoline ring or a substituted or unsubstituted pyridine ring substituted or unsubstituted, and Z _3, the Z ₄ the ring = N ⁺ ( R
₁ ) -bond or -N (R ₆ )-bond.

Y ₁ and Y ₂ each represent a dialkyl-substituted carbon atom, a vinylene group, an oxygen atom, a sulfur atom, a selenium atom, or a nitrogen atom to which a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group is bonded. Represent.

R ₁ and R ₆ each represent a substituted or unsubstituted alkyl group; R ₂ , R ₄ and R ₅ each represent a hydrogen atom or a substituted or unsubstituted alkyl group; R ₃ represents a hydrogen atom , A halogen atom, a substituted or unsubstituted alkyl group,
Represents a substituted or unsubstituted aryl group, or a nitrogen atom to which an alkyl group or an aryl group is bonded.

However, at least one of the groups represented by Z _{1 to} Z ₄ and R _{1 to} R ₆ is at least one of acid groups such as a sulfo group, a carboxyl group and a phosphono group (preferably a sulfo group). Has been replaced.

[0025] X ^- is an anion, m is 0 or 1, n
Represents an integer of 1 or 2. However, n is 1 when the dye forms an inner salt.

[0026]

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In the formula, R ₁ , R ₂ , R ₃ and R ₄ are each a substituted or unsubstituted alkyl group, —N (R ₅ ) (R ₆ ), NN ⁺ (R ₅ )
(R ₆ ) or a sulfo group, and R ₅ and R ₆ each represent a substituted or unsubstituted alkyl group. However, at least one of the groups represented by R _{1 to} R ₆ is a sulfo group, a carboxyl group,
It is substituted by at least one of acid groups such as a phosphono group (preferably a sulfo group). X ^- represents an anion.

[0028]

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In the formula, R ₁ , R ₂ , R ₃ and R ₄ each represent a substituted or unsubstituted alkyl group, at least one of which is a sulfo group, a carboxyl group, a phosphono group or the like (preferably a sulfo group) ) Is substituted with at least one of the acid groups.

[0030]

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In the formula, R ₁ and R ₂ each represent a substituted or unsubstituted alkyl group, at least one of which is at least one of an acid group such as a sulfo group, a carboxyl group and a phosphono group (preferably a sulfo group). Has been replaced. R ₃ and R ₄ each represent a hydrogen atom or an alkyl group, and the alkyl group may be substituted with an acid group such as a sulfo group, a carboxyl group, and a phosphono group (preferably a sulfo group).

[0032]

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In the formula, R ₁ , R ₂ and R ₃ each represent a substituted or unsubstituted alkyl group, at least one of which is an acid such as a sulfo group, a carboxyl group or a phosphono group (preferably a sulfo group). It is substituted with at least one of the groups. X
^- represents an anion.

[0034]

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In the formula, R ₁ and R ₂ each represent a sulfo group, a carboxyl group, a phosphono group, or an alkyl group or an aryl group substituted with one of them.

[0036]

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In the formula, R ₁ represents a hydrogen atom, an amide group, an amino group, an alkyl group, or a sulfo group, a carboxyl group, a phosphono group or an alkyl group substituted with one of them, and R ₂ and R ₃ represent Each represents an alkyl group substituted with at least one of an alkyl group or a sulfo group, a carboxyl group, and a phosphono group, and R ₄ represents a hydrogen atom, a sulfo group, a carboxyl group, a phosphono group, or an alkyl group substituted with one of them. Represents a group.

M represents a metal atom (preferably Cu or Ni), and X ⁻ represents an anion.

[0039]

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In the formula, R ₁ represents a hydrogen atom or an alkyl group substituted with one of a sulfo group, a carboxyl group, and a phosphono group, and R ₂ represents an alkyl group, an amide group, a nitro group, a sulfo group, a carboxyl group. Or a phosphono group.

[0041]

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In the formula, R ₁ and R ₂ each represent a sulfo group, a carboxyl group, a phosphono group or an alkyl group substituted by one of them, and n represents 2 or 3. R ₃ , R ₄ , R
₅ and R ₆ each represent an alkyl group which may be the same or different.

[0043]

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In the formula, R ₁ and R ₂ each represent a hydrogen atom, a sulfo group, a carboxyl group, a phosphono group or an alkyl group substituted by one of them. However, R ₁ and R ₂ are not both hydrogen atoms. M represents a divalent or trivalent metal atom, and n represents an integer of 2 or 3.

[0045]

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In the formula, R ₁ R ₂ R ₃ and R ₄ each represent a hydrogen atom, a sulfo group, a carboxyl group, a phosphono group or an alkyl group substituted by one of them. However, R ₁ ~
R ₄ is not all hydrogen atoms. M represents a divalent metal atom.

The following are typical specific examples of the water-soluble coloring materials represented by the general formulas (1) to (12), but are not limited thereto.

[0048]

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[0049]

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[0050]

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[0051]

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In addition, as a near infrared absorbing dye,
-123454 and JP-A-3-146565.

These water-soluble coloring materials are dissolved in water together with a water-soluble binder or an aqueous emulsion resin to prepare a coating solution for a photothermal conversion layer. Examples of the water-soluble binder include polyvinyl alcohol, polyvinylpyrrolidone, and the like.
Gelatin, glue, casein, hydroxyethylcellulose, carboxymethylcellulose, methylcellulose,
Hydroxyethyl starch, gum arabic, saccharose octaacetate, ammonium alginate, sodium alginate, polyvinylamine polyethylene oxide, polystyrenesulfonic acid, polyacrylic acid and the like,
Particularly, polyvinyl alcohol and celluloses are preferably used.

A surfactant may be added to the coating liquid to improve coating properties, and a substance which increases the adhesion between the light-to-heat conversion layer and the lower layer, and the releasability from the upper ink layer. May be contained. When dissolving the water-soluble coloring material and the binder, heating and shearing may be added to assist the dissolution.

The amount of the light-to-heat conversion substance in the light-to-heat conversion layer is usually 2
8080% by weight, preferably 20-70% by weight. This light-to-heat conversion material can be added to other layers.

The ink layer is preferably prepared by dissolving or dispersing a necessary coloring material in a solvent together with a binder to prepare a coating solution.

As the binder, ethyl cellulose,
Cellulosic resins such as hydroxyethylcellulose, ethylhydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, cellulose acetate; polyvinyl alcohol, polyvinyl formal, polyvinyl butyral, polyvinyl pyrrolidone, polyester, polyvinyl acetate, polyacrylamide, polyvinyl acetoacetal, styrene resin, styrene Examples include vinyl resins such as copolymer resins, polyacrylates, polyacrylic acids, and acrylic acid copolymers, rubber resins, ionomer resins, olefin resins, and rosin resins.
Among them, polyvinyl butyral, polyvinyl acetoacetal or cellulose resin having excellent acid resistance is preferable.

As coloring materials, inorganic or organic pigments,
Dyes are used, and for example, pigment compounds of yellow, magenta, and cyan are preferable.

Examples of the inorganic pigment include titanium dioxide, carbon black, zinc oxide, Prussian blue, cadmium sulfide, iron oxide, and chromates of lead, zinc, barium, and calcium. As organic pigments,
Examples include azo-based, thioindigo-based, anthraquinone-based, anthranthrone-based, triphenedioxazine-based pigments, vat dye pigments, phthalocyanine pigments (copper phthalocyanine and derivatives thereof), and quinacridone pigments.
Examples of the organic dyes include acid dyes, direct dyes, disperse dyes, oil-soluble dyes, metal-containing oil-soluble dyes, and sublimable dyes (including heat sublimable dyes).

Examples of the solvent include ketones such as acetone, methyl ethyl ketone and cyclohexanone; esters such as ethyl acetate, amyl acetate, dimethyl phthalate and ethyl benzoate; aromatic hydrocarbons such as toluene, xylene and benzene; Halogenated hydrocarbons such as carbon tetrachloride, trichloroethylene, and chlorobenzene, ethers such as diethyl ether, methyl cellosolve, and tetrahydrofuran, and dimethylformamide, dimethyl sulfoxide, bentoxone, and the like can be used.

The weight ratio between the binder and the coloring material is from 1:10 to 1
0: 1 is preferable, and 2: 8 to 8: 2 is particularly preferable.

Various additives can be added to the ink layer as long as the object of the present invention is not impaired. Specifically, silicon, silicone oil (reaction hardening type is also possible), silicon-modified resin, fluororesin, surfactant and release compounds such as wax, metal powder, silica gel, metal oxide, carbon black and resin fine powder Fillers such as powders, curing agents (eg, isocyanates, acrylics, epoxies) that can react with binder components, waxes, hot solvents, and the like.

Any support can be used as long as it has good dimensional stability and can withstand heat during image formation. Specifically, the film described in JP-A-63-193886, page 2, lower left column, lines 12 to 18 can be used. Or a sheet can be used.

When an image is formed by irradiating a laser beam from the support side, the support is preferably transparent. The support need not be particularly transparent as long as the laser beam is applied from the image receiving layer side.

The thickness of the support is not particularly limited.
100100 μm, preferably 5-20 μm.

The smaller the thickness of the light-to-heat conversion layer and the ink layer, the shorter the time required for the thermal energy obtained by the light-to-heat conversion layer to reach the interface between the ink layer and the image receiving layer. Since the heat capacity is reduced, less energy is required to reach the melting temperature. Therefore, both are preferably 1.0 μm or less, and particularly preferably in the range of 0.2 to 0.8 μm.

In the present invention, it is preferable that an intermediate layer is interposed between the light-to-heat conversion layer and the ink layer. The intermediate layer can have various functions. For example, a function as a barrier layer for preventing the thermal diffusion color material in the ink layer from diffusing into another layer, a function as a cushion layer for increasing the adhesion between the recording material and the image receiving material, and a function as an ink layer and an image receiving device during image formation. A function such as a release layer for facilitating release from the layer can be imparted to the intermediate layer. Next, the thermal transfer image receiving material will be described.

The image receiving material receives the hot-melt ink layer peeled imagewise from the recording material to form an image. Usually, the image receiving material has a support and an image receiving layer, and may be formed of only the support.

Since the heat-meltable ink layer melted by heat is transferred to the image receiving material, it is desirable that the image receiving material has an appropriate heat resistance and an excellent dimensional stability so that an image can be formed properly.

The surface of the image receiving material which comes into contact with the recording material during image formation has good smoothness or is appropriately roughened. More specifically, when the surface of the heat-fusible ink layer of the recording material is roughened by a mat material or the like, the surface of the image receiving material that contacts the heat-fusible ink layer preferably has good smoothness, When the heat-fusible ink layer is not roughened, it is desirable that the surface of the image receiving material that contacts the heat-fusible ink layer is roughened by a mat material. Further, the contact surface between the heat-fusible ink layer and the image receiving material may be both roughened.

The image receiving layer can be formed of a binder, various additives added as required, and a substance for imparting the cushioning property.

As the binder, adhesives such as ethylene-vinyl chloride copolymer adhesive, polyvinyl acetate emulsion adhesive, chloroprene adhesive, epoxy resin adhesive, natural rubber, chloroprene rubber, butyl rubber, Adhesives such as polyacrylate, nitrile rubber, polysulfide, silicon rubber, rosin resin, vinyl chloride resin, petroleum resin and ionomer resin, recycled rubber, SBR, polyisoprene, polyvinyl ether, etc. be able to.

The cushion layer interposed between the support and the image receiving layer is the same as the cushion layer described for the recording material.

The thickness of the support in the image receiving material having the support, the cushion layer and the image receiving layer, or the thickness of the support in the image receiving material formed only of the support is not particularly limited. The thickness of the cushion layer is the same as the thickness of the cushion layer in the recording material. The thickness of the image receiving layer is usually from 0.1 to 20 μm, but is not limited to the case where the cushion layer is used as the image receiving layer.

[0075]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited thereto.

Example 1 (Preparation of Ink Sheet) An ink sheet was prepared by sequentially applying the following cushion layer, light-to-heat conversion layer, and ink layer on a 100 μm-thick PET (polyethylene terephthalate) support. The amounts of raw materials in each layer are all shown in parts by weight.

<Cushion Layer> A coating solution having the following composition was prepared, applied and dried using a blade coater. The film thickness is about 60μm.

JSR0617 (carboxy-modified styrene-butadiene resin 10 parts: manufactured by Nippon Synthetic Rubber) Water 90 parts <Light-to-heat conversion layer> A coating solution having the following composition was prepared, and was applied and dried on the cushion layer using a wire bar. . The film thickness was controlled in advance by examining the relationship between the absorbance at 830 nm of the photothermal conversion material and the film thickness, and measuring the absorbance.

When a water-soluble light-to-heat conversion material is used : Water-soluble light- to-heat conversion material 3.50 parts GL-05 (polyvinyl alcohol: manufactured by Nippon Synthetic Chemical) 3.43 parts FT248 (aqueous surfactant: manufactured by BASF) 0.07 parts Water 93 parts Solvent solubility When using a light-to-heat conversion material: Solvent-soluble light-to-heat conversion material 3.5 parts S-2000 (polycarbonate: manufactured by Mitsubishi Gas) 3.5 parts MEK (methyl ethyl ketone) 93.0 parts <Ink layer> Prepare a coating solution having the following composition and apply it on the light-to-heat conversion layer. And dried using a wire bar.

DS-90 (manufactured by Harima Kasei) 4.7 parts SD0012 (manufactured by Tokyo Ink) 0.5 part EV-40Y (manufactured by Mitsui Dupont) 0.5 part DOP (dioctyl phthalate) 0.3 part MHI R527 (magenta pigment) 4.0 parts MEK 90.0 parts ( Preparation of Image Receiver) On a 100 μm-thick PET support, the following cushion layer and image receiving layer were sequentially applied to prepare an ink sheet. The amount of material in each layer is all parts by weight.

<Cushion Layer> A coating solution having the following composition was prepared, applied and dried using a blade coater. The film thickness is about 60μm.

JSR 0617 (Japan Synthetic Rubber) 10 parts Water 90 parts <Image-receiving layer> A coating solution having the following composition was prepared, and was applied and dried on the cushion layer using a wire bar. The film thickness is 1.
0 μm.

RB820 (styrene-butadiene resin: manufactured by Nippon Synthetic Rubber) 10 parts Toluene 90 parts (Image formation by thermal transfer) The ink sheet is placed on a drum such that the ink layer of the ink sheet and the image receiving layer side of the image receiving member are in contact with each other. And superimposed. Then, the pressure was reduced using a vacuum pump to increase the adhesion between the two, and the air between the ink sheet and the image receiving member was removed. At this time, the adhesion was further increased by squeezing.

Irradiation was performed with a semiconductor laser (830 nm) from the ink sheet support side, and the transferred image was observed when the number of rotations of the drum was changed, and the sensitivity, color reproducibility, dot reproducibility and the like were evaluated.

Example 2 An ink sheet (thickness of the light-to-heat conversion layer 0.35 μm, thickness of the ink layer about 0.7 μm, thickness of the cushion layer about 60 μm) according to the example 1 by changing the light-to-heat conversion material as follows. Then, an image receiver was prepared, and thermal transfer was performed using a semiconductor laser, and the sensitivity and color reproducibility of the obtained transferred image were evaluated. As a matter of course, S-2000 was used as a binder in a solvent system, and GL-05 was used as a binder in an aqueous system.

(Solvent-soluble photothermal conversion material) A: IR101 (dithiol metal complex salt) B: IR102 (solvent-dispersed photothermal conversion material) C: IR103 (MEK dispersion of carbon) D: IR104 (MEK dispersion of titanyl phthalocyanine) ) (Water-soluble photothermal conversion material) E: IR105 (cyanine dye) F: IR106 (cyanine dye) G: IR107 (chelate dye)

[0087]

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[0088]

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The results are as follows.

Light-to-heat conversion material Sensitivity (mJ / mm ² ) Color reproducibility Remarks IR101 5.00 Large color turbidity Comparative example IR102 3.00 Large color turbidity Comparative example IR103 4.00 Large color turbidity Comparative example IR104 4.50 Large color turbidity Comparative example IR105 0.50 Color turbidity No Invention IR106 0.50 Color turbidity No Invention IR107 1.50 Color turbidity small From the above results, it is clear that by using an aqueous photothermal conversion material, color turbidity due to the photothermal conversion material can be suppressed,
When sensitivity is also taken into consideration, it can be seen that the use of IR106 as a photothermal conversion material is advantageous.

Example 3 The following water-soluble binder and solvent-soluble binder were used as the light-to-heat conversion layer binder, and the sensitivity and color reproducibility were evaluated. IR106 is used as the light-to-heat conversion material when using a water-soluble binder, and I is used when using a solvent-soluble binder.
R102 was used.

P1800NT11 (Polyethersulfone: manufactured by Nissan Chemical Industries) Poorly soluble in water, soluble in MEK U-100 (Polyarylate: manufactured by Unitika) Poorly soluble in water, soluble in MEK S-2000 (Polycarbonate: Mitsubishi Gas) Made of) Poorly soluble in water, soluble in MEK Pesresin A515G (polyester: made by Takamatsu Yushi) Poorly soluble in water, soluble in MEK Polysol AP2681 (styrene-acryl: made of Showa Polymer) Poorly soluble in water, soluble in MEK UCAR AW850 (vinyl chloride-vinyl acetate: made by UCC) Poorly soluble in water, soluble in MEK TS-625 (gelatin) Soluble in water, poorly soluble in MEK Polyvinylpyrrolidone (K-90) Soluble in water, MEK Poorly soluble GL-05 (polyvinyl alcohol: manufactured by Nippon Synthetic Chemical Industry) Soluble in water, poorly soluble in MEK The following results were obtained.

Binder solvent sensitivity (mJ / mm ² ) Color reproducibility P1800NT11 THF / MEK (6/4) 5.00 Large turbidity U-100 THF / MEK (6/4) 5.00 Large turbidity S- 2000 THF / MEK (6/4) 3.00 Large turbidity Pesresin A515G Water (dispersion) 1.00 Small turbidity AP2681 Water (dispersed) 1.50 Small turbidity UCAR AW850 Water (dispersed) 1.00 Small turbidity TS-625 Water 0.75 No turbidity K-90 Water 0.75 No color turbidity GL-05 Water 0.50 No color turbidity From these results, it is clear that color reproducibility can be improved by using an aqueous binder as a binder for the light-to-heat conversion layer.

Example 4 An ink sheet was prepared in the same manner as in Example 1, except that IR102 was used as the water-soluble photothermal conversion material and GL-05 was used as the binder. At this time, the thickness of the photothermal conversion layer was changed to a range of 0.1 to 3.0 μm, and the thickness of the ink layer was changed to a range of 0.3 to 2.0 μm. However, the thickness of the light-to-heat conversion layer was 830 nm, and the thickness of the ink layer was 570 nm.
It was determined from the measurement of absorbance at nm. The relationship between the thickness of the photothermal conversion layer and the sensitivity is shown below.

Binder film thickness (μm) Ink layer film thickness (μm) Sensitivity (mJ / mm ² ) 0.10 0.70 0.40 0.20 0.70 0.40 0.25 0.70 0.40 0.30 0.70 0.50 0.35 0.70 0.50 0.40 0.70 0.61 0.60 0.70 0.75 0.80 0.70 1.00 1.10 0.70 3.25 1.50 0.70 3.50 2.00 0.70 4.00 3.00 0.70 4.50 0.35 0.30 0.50 0.35 0.40 0.50 0.35 0.60 0.50 0.35 0.90 0.75 0.35 1.10 1.25 0.35 1.50 1.25 0.35 2.00 1.25

[0096]

[Table 1]

The degree of heat resistance of the material used in the light-to-heat conversion layer depends on the applied energy and cannot be unconditionally determined. However, a polymer binder or a light-to-heat conversion dye having a similar structure can be used. In the additives of
It was confirmed that use of a compound exhibiting water solubility improved heat resistance.

When the light-to-heat conversion layer is made water-soluble, the light-to-heat conversion layer is hardly corroded when an ink layer is applied thereon, and a good layer structure can be obtained. It is also advantageous.

[0099]

According to the heat mode thermal transfer recording material of the present invention, a transferred image excellent in color reproducibility without color turbidity can be obtained by using laser beam scanning.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view when a heat mode thermal transfer recording material of the present invention is overlaid on an image receiving material to perform thermal transfer.

[Description of Signs] 1 support 2 image receiving layer 3 ink layer 4 light-heat conversion layer 5 release layer 6 cushion layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-319192 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41M 5/38-5/40

Claims (4)

(57) [Claims] 1. A support containing a coloring material which is at least 0.1% by weight or more dissolved in water, wherein a water-soluble binder or an aqueous emulsion resin is substantially used as a solvent in water.
A heat mode thermal transfer recording material comprising a coating liquid, a light- to- heat conversion layer formed by coating the coating liquid, and an ink layer having a thickness of 1.0 μm or less. 2. A heat mode thermal transfer recording material according to claim 1, wherein said coloring material contains a sulfo group. 3. A heat mode thermal transfer recording material according to claim 1, wherein said coloring material is a near-infrared absorbing dye having an absorption peak at a long wavelength of 700 nm or more. 4. The photothermal conversion layer according to claim 1, wherein the thickness of the photothermal conversion layer is 1.0 μm or less, and the transmittance of the photothermal conversion layer at an absorption peak at a wavelength of 700 nm or more is 10% or less. Heat mode thermal transfer recording material.