JPH04201492A - Image-receiving sheet for thermal transfer recording - Google Patents

Abstract

PURPOSE:To obtain an image-receiving sheet for thermal transfer recording having the high fixing properties of a dyestuff, high picture shelf stability and the high permeation preventive properties of the dyestuff by laminating a first image receiving layer and a second image receiving layer on a supporter in the order and making the thermal diffusive dye acceptability of the first image receiving layer larger than that of the second image receiving layer. CONSTITUTION:In an image-receiving sheet for thermal transfer recording, a first image receiving layer 2a and a second image receiving layer 2b are laminated on a supporter 1 in the order. Both the first image receiving layer and the second image receiving layer are also formed of a binder for the image receiving layers and various additives. The first image receiving layer and the second image receiving layer can be shaped only of the binder for the image receiving layers as occasion calls. It is important that the acceptability of the thermal diffusive dye of the first image receiving layer is made larger than that of the thermal diffusive dye of the second image receiving layer at that time. Materials are selected property from the binder for the image receiving layer, the additive, etc., or these loading, the thickness of the image receiving layer, etc., may be adjusted in order to discriminate between acceptability to the thermal diffusive dyes.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image-receiving sheet for thermal transfer recording, and more specifically, it is capable of recording images with excellent fixing properties and high fixing properties, and is capable of recording images with excellent fixing properties. This invention relates to an image-receiving sheet for thermal transfer recording that does not cause bleeding in images.

[Prior Art and Problems to be Solved by the Invention] Conventionally, color recording techniques such as inkjet, electrophotography, and thermal transfer recording have been studied as methods for obtaining color hard copies.

Among these, the thermal transfer recording method in particular has advantages such as easy operation and maintenance, miniaturization of the device, and low cost.

There are two types of this thermal transfer recording method:

Specifically, there is a method in which a transfer sheet having a meltable ink layer on a support is imagewise heated with a laser or a thermal head to melt and transfer the meltable ink layer onto an image-receiving sheet for thermal transfer recording; Thermal diffusion transfer method uses an ink sheet for thermal transfer recording having an ink layer containing a thermal diffusible dye (sublimable dye) to diffusely transfer the thermal diffusible dye to an image receiving sheet for thermal transfer recording. It is.
- Among these, the thermal diffusion transfer method can control the gradation of the image by changing the amount of dye transferred according to changes in the thermal energy of the thermal head.
In recent years, this method has attracted attention as a method for obtaining color images with continuous changes in color shading by overlapping recording of cyan, magenta, and yellow.

However, conventional thermal diffusion transfer methods have various problems.

For example, in conventional image-receiving sheets for thermal transfer recording, the fixability of dyes transferred from the ink sheet for thermal transfer recording during thermal transfer is not necessarily good.

Furthermore, the storage stability of the formed images was not sufficient, especially when stored for a long period of time in a high temperature environment, the dye bleed out, making it impossible to maintain the image quality at the time of image formation. .

Furthermore, the dye of the image sometimes bleeds onto the surface of the image-receiving sheet for sensitive transfer recording, making it difficult to maintain the image sharply for a long period of time.

The present invention has been made to improve the above situation.

That is, an object of the present invention is to provide an image-receiving sheet for thermal transfer recording that has high dye fixing properties, high image storage properties, and high dye bleeding prevention properties.

[Means for Solving the Problems] The present invention for achieving the above objects comprises laminating a first image-receiving layer and a second image-receiving layer in this order on a support. The present invention is an image-receiving sheet for heat-sensitive transfer recording, characterized in that the thermo-diffusible dye receptivity of the second image-receiving layer is greater than the heat-diffusible dye receptivity of the second image-receiving layer.

The present invention will be explained in detail below.

(1.) Image-receiving sheet for thermal transfer recording The image-receiving sheet for thermal transfer recording of the present invention basically has a first image-receiving layer 2 on a support l, as shown in FIG.
a and the second image receiving layer 2b are laminated in this order.

Specific supports include, for example, paper, coated paper, synthetic paper (polypropylene, polystyrene, or a composite material made of paper or plastic film), white polyethylene terephthalate base film, transparent polyethylene terephthalate. Base films, polyolefin coated papers, etc. can be mentioned.

The thickness of the support is usually 20 to 300 um, preferably 3
It is 0 to 200 um.

Both the first image-receiving layer and the second image-receiving layer can be formed from an image-receiving layer binder and various additives.

Further, in some cases, the first image-receiving layer and the second image-receiving layer can be formed using only the binder for the image-receiving layer.

In the present invention, it is important that the first image-receiving layer has better receptivity to heat-diffusible dyes than the second image-receiving layer.

However, in the present invention, "the superiority and inferiority of acceptability of heat-diffusible dyes"
can be evaluated using the following measurement method.

The ratio of various resin binders and pigments described below is 100.
: A first colored layer is provided by preparing a coating solution by mixing at a ratio of 1,000 ml, and drying the coating solution onto a support so that the dry film thickness becomes 4 μm. , a coating solution prepared with a resin binder different from that of the first color layer and the dye used in the first color layer was coated with a dry film thickness of 4μ■
A second @color layer was provided by laminated coating and drying so that the results were as follows.

The colored layer laminated as above was heated to 100°C and left for 24 hours, then sliced perpendicularly to the lamination direction to a thickness of 3 ul+, and the tomographic plane was observed with a microtome. to determine the superiority or inferiority of acceptability.

Further, the additives described below are also judged using the same method.

If the receptivity of the heat-diffusible dye in the first image-receiving layer is superior to the receptivity of the heat-diffusible dye in the second image-receiving layer, the image-receiving sheet for thermal transfer recording has high fixability and high fixability of the heat-diffusible dye. It can exhibit excellent image storage stability and high bleeding prevention properties of heat-diffusible dyes.

In order to produce such an effect, in order to differentiate the receptivity of the first image-receiving layer and the second image-receiving layer to the heat-diffusible dye as described above, binders, additives, etc. for the image-receiving layer, which will be described later, are used. It is only necessary to appropriately select materials from among them, and adjust their blending amounts, the thickness of the image-receiving layer, and the like. Alternatively, in some cases, by using a combination that satisfies the above conditions, the dye present in the first image-receiving layer may be completely transferred to the second image-receiving layer by heating means such as a heat roll after transfer.

1. Binders for image-receiving layers The binders for image-receiving layers used in the present invention include, for example, polyvinyl chloride resins, copolymers of vinyl chloride and other polymers (for example, alkyl vinyl ethers, allyl glycidyl ethers, vinyl propionate, etc.). Resin, polyvinylidene chloride resin, polyester resin, acrylic ester, methacrylic ester, polyvinylpyrrolidone,
polycarbonate, polysulfone, polyarylate,
Examples include polyparabanic acid, cellulose triacetate, styrene acrylate resin, vinyltoluene acrylate resin, polyurethane resin, polyamide resin, urea resin, polycaprolactone resin, styrene-maleic anhydride resin, and polyacrylonitrile resin.

One type of these resins can be used alone, or two or more types can be used in combination.

The above various resins may be newly synthesized and used, but commercially available products may also be used.

In any case, from the viewpoint of physical properties, the binder for the image-receiving layer has a glass transition point (Tg) of -20 to 15.
Resins with a temperature in the range of 0°C, particularly resins with a temperature in the range of 30 to 150°C are preferred, and from the viewpoint of molecular weight, resins with Mw in the range of 2,000 to 100,000 are preferred.

In addition, when forming the image-receiving layer, the various resins mentioned above utilize their reactive active sites (if there are no reactive active sites, they are added to the resin), and are treated with radiation, heat, warm air, catalysts, etc. It may be crosslinked or cured.

In that case, a radiation active monomer such as epoxy or acrylic or a crosslinking agent such as incyanate can be used.

Among the above-mentioned resins, resins with excellent dye-receiving ability include polyvinyl chloride resins, polyvinylidene chloride resins, polyolefin resins, cellulose resins, polyester resins, (meth)acrylic resins, polyamide resins, Examples include epoxy resins and polyvinyl alcohol.

Further, examples of resins having relatively poor dye-receiving ability include polyvinyl chloride, polysulfone, polycarbonate, polyarylate, silicone resin, and fluorine resin.

However, the above classification depends on the quality of the resin itself, and in the case of copolymers, the size varies depending on the type of monomers to be copolymerized, the monomer ratio, and the method of modifying the copolymer.

Furthermore, when considered as an image-receiving layer, it depends on the additives described below (although it is not necessarily necessary to determine the binders of the first image-receiving layer and the second image-receiving layer based on the above-mentioned difference in receiving ability.

2 Additives A release agent, an antioxidant, an LJV absorber, a light stabilizer, a filler (inorganic fine particles, organic resin particles), and a pigment may be added to the image-receiving layer. Furthermore, a plasticizer, a hot solvent, etc. may be added as a sensitizer.

The release agent can improve the releasability between the ink sheet for thermal transfer recording and the image receiving sheet for thermal transfer recording.

Such release agents include silicone oil (including what is called silicone resin); solid waxes such as polyethylene wax, amide wax, and Teflon powder; fluorine-based and phosphoric acid ester-based surfactants, etc. Among them, silicone oil is preferred.

There are two types of silicone oil: a type in which it is simply added (simple addition type) and a type in which it is cured or reacted (curing reaction type).

In the case of a simple addition type, it is preferable to use modified silicone oil in order to improve compatibility with the binder.

Modified silicone oil (resin) includes polyester modified silicone oil (P4 resin), acrylic modified silicone oil (resin), and urethane modified silicone (resin).
, cellulose-modified silicone oil (one-fat type), and the like.

In particular, in the present invention, it is preferable to add a polyester-modified silicone resin.

Specifically, polyester-modified silicone resin containing polysiloxane resin in the main chain and copolymerized with polyester in block form, silicone-modified polyester resin having dimethylpolysiloxane moiety as a side chain bonded to the polyester main chain, and dimethylpolyester resin. Block copolymers, alternating copolymers, graft copolymers, random copolymers, etc. of siloxane and polyester can also be used as modified silicone oils or resins.

Typical polyester-modified silicone resins include, for example, a copolymer of diol and dibasic acid, or a block copolymer of polyester, which is a ring-opening polymer of caprolactone, and dimethylpolysiloxane (both ends or one end of dimethylpolysiloxane). Contains a copolymer in which the terminal end is blocked with the above polyester moiety, or conversely, the above polyester is blocked with dimethylpolysiloxane), or the above polyester is used as the main chain and (dimethyl)polysiloxane is bonded to the side chain. At least one copolymer can be mentioned.

The amount of these simple addition type silicone oils cannot be uniformly determined as it may vary depending on the type of silicone oil. The amount is 0.01 to 20% by weight, preferably 0.5 to 10% by weight.

Curing reaction type silicone oils include reaction curing type,
Examples include photo-curing type and catalyst-curing type.

The amount of these curable silicone oils added is preferably 05 to 30% by weight of the binder for the image-receiving layer.

In addition, after dissolving or dispersing the above-mentioned release agent in a suitable solvent and applying it to a part of the surface of the image-receiving layer.

A release agent layer can also be provided by drying or the like.

Next, as the antioxidant, JP-A-59-18278
5, No. 60-130735, JP-A No. 1-127387, etc., antioxidants, and compounds known to improve image durability in photographs and other image recording materials can be mentioned.

As the UV absorber and light stabilizer, JP-A-59-
No. 158287, No. 63-74686, No. 63-14
No. 5089, No. 59-196292, No. 62-229
No. 594, No. 63-122596, No. 61-28359
Compounds described in No. 5, JP-A-1-204788, etc.
and compounds known to improve image durability in photographs and other image recording materials.

Examples of the filler include inorganic fine particles and organic resin particles.

These inorganic fine particles include silica gel, calcium carbonate,
Examples of the organic particles include titanium oxide, acid clay, activated clay, and alumina. Examples of organic fine particles include resin particles such as fluororesin particles, guanamine resin particles, acrylic resin particles, and silicone resin particles. These inorganic/organic resin particles vary depending on their specific gravity, but are preferably added in an amount of 0 to 30% by weight.

Typical examples of the pigment include titanium white, calcium carbonate, zinc oxide, barium sulfate, silica, talc, clay, kaolin, activated clay, acid clay, and the like.

The plasticizers include phthalate esters, trimellitate esters, adipate esters, other saturated or unsaturated carboxylic acid esters, citric acid esters, epoxidized soybean oil, epoxidized linseed oil, epoxy stearate epoxy Examples include esters, orthophosphoric esters, phosphorous esters, and glycol esters.

In the present invention, the total amount of additives added is usually in the range of 0 to 30% by weight based on the binder for the image-receiving layer.

-Other Layers- An intermediate layer (subbing layer) may be provided between the image-receiving layer and the support for the purpose of imparting properties such as heat insulation, barrier properties, cushioning properties, and adhesive properties.

Further, an overcoat layer may be laminated on the surface of the image-receiving layer for the purpose of preventing fusion between the ink sheet for thermal transfer recording and the image-receiving sheet for thermal transfer recording.

Furthermore, a backing layer may be provided on the surface opposite to the image-receiving layer (support surface) for the purpose of preventing charging, curling, and the like.

(2.) Manufacture of image-receiving sheet for thermal transfer recording The image-receiving sheet for thermal transfer recording is prepared by dispersing or dissolving the components for forming the image-receiving layer in a solvent to prepare a coating liquid for the image-receiving layer, and applying the coating solution for the image-receiving layer. It can be formed by a coating method in which a liquid is applied to the surface of a support and dried, or a lamination method in which a mixture containing the components for forming the image receiving layer is melt-extruded and laminated on the surface of the support.

The solvents used in the above coating method include water, alcohols (
e.g. ethanol, propatool).

cellosolves (e.g. methyl cellosolve, ethyl cellosolve), aromatic flags (e.g. toluene, xylene, chlorobenzene), ketone jaws (e.g. acetone, methyl ethyl ketone), ester solvents (e.g. ethyl acetate, butyl acetate), ethers (e.g. (tetrahydrofuran, dioxane), chlorinated solvents (for example, chloroform, trichlorethylene), and the like.

For the coating, conventional methods such as surface sequential coating using a gravure roll, extrusion coating, wire bar coating, roll coating, etc. can be employed.

The image receiving layer may be formed over the entire surface of the support, or may be formed on a part of the surface.

In the present invention, there are preferable conditions regarding the thickness of the image-receiving layer.

That is, the thickness of the first image-receiving layer is 3 um or more, preferably 5 to 20 um, and the thickness of the second image-receiving layer is 3 um or more.
Preferably it is less than 0.05 am, preferably from 0.05 to 2.00 am. If the thickness of the first image-receiving layer is less than 3 μm, the dye retention ability may be insufficient and image preservation may deteriorate; if the thickness of the second image-receiving layer exceeds 3 μm, the dye may not be sufficiently diffused. This is because, like the former, sufficient image storage stability may not be obtained.

(3.) Ink sheet for thermal transfer recording An ink sheet for thermal transfer recording is basically formed by laminating an ink layer on a support.

The support used in the present invention has good dimensional stability (
Any material may be used as long as it can withstand the heat during recording with a thermal head, such as condenser paper, thin paper such as glassine paper, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polycarbonate,
polysulfone, polyvinyl alcohol, cellophane,
A heat resistant plastic film such as polystyrene can be used.

The thickness of the support is preferably 2 to IO μm.

There are no particular restrictions on the shape of the support (for example, it may have any shape, such as a wide sheet or film, or a narrow tape or card).

One Ink Layer - The ink layer contains a heat-diffusible dye and a binder as essential components.

! , Heat-diffusible dyes Examples of heat-diffusible dyes include cyan dyes, magenta dyes, and yellow dyes.

As the cyan dye, JP-A-59-78896;
No. 59-227948, No. 60-24966, No. 6
No. 0-53563, No. 60-130735, No. 60-
No. 131292, No. 60-239289, No. 61-1
No. 9396, No. 61-22993, No. 61-3129
No. 2, No. 6]-31467, No. 61-35994 5
No. 61-49893, No. +1+1-148269,
No. 62-191191, No. 63-91288, No. 6
Examples include naphthoquinone dyes, anthraquinone dyes, and azomethine dyes described in publications such as No. 3-91287 and No. 63-290793.

Examples of magenta dyes include JP-A-59-78896, JP-A-60-30392, JP-A-60-30394,
JP 60-253595, JP 61-26219
No. 0, JP-A-63-5992, JP-A-63-2052
No. 88, JP-A-64-159, JP-A-64-6319
Examples include anthraquinone dyes, azo dyes, and azomethine dyes described in publications such as No. 4.

As yellow pigments, JP-A-59-78896, JP-A-60-27594, JP-A-60-31560,
Methine dyes, azo dyes, quinophthalone dyes, which are described in JP-A-60-53565, JP-A-61-12394, JP-A-63-122594, etc.
Examples include anthrisothiazole dyes.

Also, particularly preferred as the heat-diffusible dye are:

Azomethine dyes and phenol or naphthol derivatives or p-phenylene obtained by a coupling reaction of a compound having an open-chain or closed-chain active methylene group with an oxidized product of a p-phenylenediamine derivative or an oxidized product of a p-aminophenol derivative. It is an indoaniline dye obtained by a coupling reaction with an oxidized product of a diamine derivative or an oxidized product of a p-aminophenol derivative.

The heat-diffusible dye contained in the ink layer may be any of a yellow dye, a magenta dye, and a cyan dye, as long as the image to be formed is monochromatic.

Furthermore, depending on the color tone of the image to be formed, it may contain two or more of the three types of dyes or other heat-diffusible dyes.

The amount of the heat-diffusible dye used is usually 1.1 to 5 g, preferably 0.2 to 2 g per 1 m 2 of the support.

2. The binder of the binder ink layer is a cellulose addition compound,
Cellulose resins such as cellulose ester and cellulose ether; polyvinyl alcohol, polyvinyl formal, polyvinyl acetoacetal, polyvinyl acetal resins such as polyvinyl butyral, polyvinylpyrrolidone, polyvinyl acetate, polyacrylamide, styrene resin, poly(meth)acrylic acid type Examples include vinyl resins such as esters, poly(meth)acrylic acid, and (meth)acrylic acid copolymers, rubber resins, ionomer resins, olefin resins, and polyester resins.

Among these resins, polyvinyl butyral, polyvinyl acetoacetal, or cellulose resins are preferred because of their excellent preservability.

The above-mentioned various binders can be used alone or in combination of two or more.

The weight ratio of the binder and the heat diffusible dye is 1:10.
-10:l is preferred, and a range of 2:8 to 7:3 is particularly preferred.

3. Other optional components Furthermore, various additives may be appropriately added to the ink layer.

As additives, silicone resin, silicone oil (
fillers and binder components such as silicone-modified resins, fluororesins, surfactants, and release compounds such as wax necks, fine metal powders, silica gel, metal oxides, carbon black, and fine resin powders. curing agents (for example, radiation-active compounds such as incyanates, acrylics, and epoxies) that can react with the curing agent.

Furthermore, examples of additives include heat-melting substances for promoting transfer, such as waxes and higher fatty acid esters, which are described in JP-A-59-106997.

-Other Layers- Note that the ink sheet for thermal transfer recording is not limited to a two-layer structure consisting of a support and an ink layer, and other layers may be formed.

For example, an overcoat layer may be provided on the surface of the ink layer for the purpose of preventing fusion with the image-receiving sheet for thermal transfer recording and setting-off (blocking) of the heat-diffusible dye.

The support may also have a subbing layer for the purpose of improving adhesion to the binder and preventing transfer and dyeing of the dye to the support.

Furthermore, a backing layer may be provided on the back surface of the support (the side opposite to the ink layer) for the purposes of running stability, heat resistance, antistatic properties, and the like.

The thickness of this backing layer is typically 0.1 to Igm.

(4,) Manufacture of ink sheet for thermal transfer recording The ink sheet for thermal transfer recording is prepared by preparing a coating liquid for forming an ink layer by dispersing or dissolving the various components forming the ink layer in a solvent, It can be manufactured by coating this on the surface of a support and drying it.

Note that one or more of the binders are used by dissolving them in a solvent or dispersing them in a latex form.

Examples of the solvent include water, ethanol, tetrahydrofuran, methyl ethyl ketone, toluene, xylene, chloroform, dioxane, acetone, cyclohexane, n-butyl acetate, and the like.

For the coating, conventional methods such as surface sequential coating using a gravure roll, extrusion coating, wire bar coating, roll coating, etc. can be employed.

The ink layer may be formed as a layer containing a monochromatic heat-diffusible dye on the entire surface or a part of the surface of the support, or a yellow ink layer containing a binder and a yellow dye, or a layer containing a binder and a yellow dye. Even if a magenta ink layer containing a binder and a magenta dye and a cyan ink layer containing a binder and a cyan dye are formed on the entire surface or a part of the surface of the support in a constant repetition along the planar direction, good.

Further, in addition to the three ink layers arranged in the plane direction, a black ink layer containing a black image forming substance may be interposed.

Note that with regard to the black ink layer, clear images can be obtained with either the diffusion transfer type or the melt transfer type.

The thickness of the ink layer thus formed is normal.

'0.2~lOum, preferably 0.3~3u
It is m.

In addition, by forming perforations on the ink sheet for thermal transfer recording or providing detection marks to detect the positions of areas with different hues,
It can also be used more conveniently.

(5,) Image formation (thermal transfer reprinting 8) To form an image, the ink layer of the ink sheet for thermal transfer recording and the image-receiving layer of the image-receiving sheet for thermal transfer recording are overlapped, and the ink layer and image-receiving layer are Apply thermal energy imagewise to the interface with the

Then, the heat-diffusible dye in the ink layer is vaporized or sublimated in an amount corresponding to the applied thermal energy, transferred to the image-receiving layer side, and received, thereby forming an image on the image-receiving layer.

In the present invention, since the first image-receiving layer of the image-receiving sheet for thermal transfer recording is superior to the second image-receiving layer in terms of receptivity for heat-diffusible dyes, the heat-diffusible dyes from the ink sheet for thermal transfer recording are removed during thermal transfer. has good fixing properties.

In addition, the image-receiving sheet for thermal transfer 2 of the present invention can be dyed by light, heat, etc. by selecting binders and additives for the image-receiving layer for each of the first and second image-receiving layers during storage. Not only can bleeding of images be reliably prevented, but also the storage stability of images can be improved.

A thermal head is generally used as a heat source for providing the thermal energy, but other known sources such as a laser beam, an infrared flash, and a thermal pen can also be used.

When a thermal head is used as a heat source for providing thermal energy, the applied thermal energy can be varied continuously or in multiple stages by modulating the voltage or pulse width applied to the thermal head.

When a laser beam is used as a heat source for providing thermal energy, the amount of thermal energy provided can be changed by changing the amount of laser light or the irradiation area.

In this case, in order to easily absorb laser light, a laser light absorbing material $4 (for example, in the case of a semiconductor laser, carbon black or a near-infrared absorbing material) is added to the ink layer.
Alternatively, it may be made to exist near the ink layer.

When using a laser beam, it is preferable to bring the ink sheet for thermal transfer recording and the image-receiving sheet for thermal transfer recording into close contact with each other.

If a dot generator with a built-in acousto-optic element is used, thermal energy can be applied depending on the size of the halftone dot.

When using an infrared flash lamp as a heat source that provides thermal energy, as with laser light,
Heating is preferably performed through a colored layer such as black.

Alternatively, heating may be performed through a pattern or halftone dot pattern that continuously expresses the shading of an image, such as black, or a colored layer such as black on the side and a negative pattern corresponding to the negative of the above pattern. Heating may be performed in combination.

Thermal energy may be applied from the ink sheet side for thermal transfer recording, from the image receiving sheet side for thermal transfer recording, or from both sides, but if priority is given to effective use of thermal energy, It is desirable to perform this from the ink sheet side for thermal transfer recording.

By the above thermal transfer recording, it is possible to record a one-color image on the image receiving layer of the image receiving sheet for thermal transfer recording, but according to the method described below, it is also possible to obtain a color photo-like color image consisting of a combination of layers of each color. can.

For example, sequentially replace the yellow, magenta, cyan, and, if necessary, black heat-sensitive sheets for thermal transfer recording.
Perform thermal transfer according to each color.

It is also possible to obtain a color photo-like color image consisting of a combination of colors.

The following method is also effective.

That is, instead of using ink sheets for thermal transfer recording of each color as described above, an ink sheet for two thermal transfer recording sheets having areas pre-painted in each color is used.

Then, first, the yellow area is used to thermally transfer the yellow color separation image, then the magenta area is used to thermally transfer the magenta color separation image, and then the process is repeated sequentially to create yellow, magenta, cyan, and the necessary A method is adopted in which the image is thermally transferred in order with the black separated color image.

Although it is possible to obtain a color photographic-like color image with this method as well, this method has the further advantage that there is no need to replace the heat-sensitive sheet for heat-sensitive transfer recording as described above.

[Example] Next, the present invention will be explained in more detail based on Examples.

In addition, in the following, "part J represents [part J by weight.

(Example 1) A coating liquid for forming an ink layer having the following composition was applied to the corona-treated surface of a 6 part m thick polyethylene terephthalate film [manufactured by Toshiku Co., Ltd.] as a support by a wire bar coating method and dried. Apply and dry so that the remaining thickness is Igm, and apply silicone resin [manufactured by Dainichiseika Co., Ltd., 5P-2105] to the back surface that has not been corona treated.
] With a dropper, add 1.2 nitrocellulose solution containing
An ink sheet for thermal transfer recording was obtained by dripping and spreading over the entire surface and performing a backside treatment coat.

Coating liquid for ink layer formation: Disperse dye: 4 parts [Kayaset Blue 136, manufactured by Nippon Kagama Co., Ltd.] Polyvinyl butyral: ... 4 parts [Made by Block Chemical Industry Co., Ltd., S-LEC B X-1] Methyl ethyl ketone...
・・・・・・82 parts cyclohexanone・・・・・・
・・・・10 part Next, a coating liquid for forming a first image-receiving layer having the following composition was applied to a synthetic paper with a thickness of 150 μm [trade name Yubo FPG-150, manufactured by Tamago Yuka Synthetic Paper Co., Ltd. 1] as a base material. and a coating solution for a second image-receiving layer are sequentially applied and dried by a coating method to form a first image-receiving layer with a thickness of 1 Oum and a second image-receiving layer with a thickness of 2 μm on synthetic paper, thereby forming an image-receiving layer for thermal transfer recording. Got a sheet.

Coating liquid for forming the first image-receiving layer; Polyvinyl chloride 5 parts [manufactured by Shin-Etsu Chemical Co., Ltd., TK300] Polyvinyl chloride resin.
・・・・・・・・・ 4 copies [manufactured by Kenbetsu Kagaku Kogyo Co., Ltd.]

Fullhalon S OAtype] Trimellitic acid ester...1 part [Manufactured by Mudenka Kogyo Co., Ltd., Adesakaiser 079] Methyl ethyl ketone...80 parts Cyclohexanone...
・・・・・・・・・ 1O part Coating liquid for forming second image receiving layer; Polyvinyl chloride ・・・・・・・・・・ 9.5 parts [manufactured by Shin-Etsu Chemical Co., Ltd., TK600] Polyester Modified silicone resin... 0.5 part [Shin-Etsu Silicone Co., Ltd.]
X-24-8300] Methyl ethyl ketone...
・・・・・・ 81 Cyclohexanone・・・・・・・・・
- 10tl1 Next, the ink sheet for thermal transfer recording and the image-receiving sheet for thermal transfer recording are overlapped so that the surface of the ink layer of the former is in contact with the surface of the image-receiving layer of the latter,
Using a thermal head from the support side of the ink sheet for thermal transfer recording, the output power is 0.4 W/dot, and the pulse width is 0.3~
Image recording was performed by heating under the conditions of 10 m sec and a dot density of 6 dots/mm.

After the image was recorded, the transfer density on the surface of the image-receiving layer, the heat-resistant storage stability of the image, the sub-light storage stability, the dye fixing property, and the bleeding prevention property were evaluated according to the following criteria.

The results are shown in Table 1.

Transfer density: The reflection density OD value was measured using an optical densitometer.

0...OD value is 2.5 or more.

○・・・OD value is 2.0~2.5° Δ---OD value is 1.7 to 2.0.

X...OD value is 1.7 or less.

Heat resistance (heat-resistant image storage stability): The image-receiving sheet for thermal transfer recording on which an image has been recorded is kept in an environment of 77°C and 80% relative humidity for 72 hours to determine the presence or absence of bleed-out of one dye and discoloration or fading of the dye ( Judgment by silent observation) was investigated.

O...The pigment does not easily come off even if you rub the image with your hands. There is also no discoloration or fading.

X: When the image was rubbed by hand, the pigment was removed, or discoloration or fading was observed.

Light Resistance (Light Resistance Image Preservability) The image-receiving sheet for thermal transfer on which the image was recorded was exposed to light for 72 hours using a xenon weather meter, and then the image was visually judged.

○: No discoloration or fading of the pigment is observed.

×: Significant discoloration or fading of pigment.

Dye fixability.

The image-receiving sheet for thermal transfer recording on which the image was recorded was placed facing the image-receiving sheet for thermal transfer recording on which the image of the present invention was not recorded, a load of 40 g/cm2 was applied, and the image was recorded after being left at 60° C. for 48 hours. The judgment was made based on the transfer density of the dye transferred to the image-receiving sheet for thermal transfer recording.

0...The transferred dye density was less than 0.10.

○・・・Transferred dye density is 0.10 or more, 0.15
It was below.

x: The transferred dye density was 0.15 or more.

Preventing dye bleeding: The image-receiving sheet for thermal transfer recording on which an image has been recorded is heated to 60°C.
After leaving it for a week, judge the degree of bleeding by looking at it.

○: Almost no bleeding is observed.

×: Bleeding was observed.

(Example 2) The same procedure as in Example 1 was carried out except that the composition of the coating liquid for forming the first image-receiving layer was changed to the following.

Coating liquid for forming the first image-receiving layer; Polyvinyl chloride 5 parts [manufactured by Shin-Etsu Chemical Co., Ltd., TK300] Polyvinyl chloride resin.
・・・・・・・・・ 4 parts [manufactured by Kenbetsu Kagaku Kogyo Co., Ltd., Flehalon S OAtype] Polyethylene glycol 1 part [manufactured by Sanyo Chemical Co., Ltd., PE 04000S] Methyl ethyl ketone...・・・・・・ 80 parts cyclohexanone...
10 parts (Example 3) The same procedure as in Example 1 was carried out except that the composition of the first image-receiving layer forming coating liquid was changed to the following.

Coating liquid for forming the first image-receiving layer; Polyvinyl chloride 45 parts [manufactured by Shin-Etsu Chemical Co., Ltd., TK300] Polyester resin.
・・・・・・・・・ 4 parts [manufactured by Kenbetsu Kagaku Kogyo Co., Ltd., Frehalon S OAtype] Trimellitic acid ester 1 part [manufactured by Layojuka Kogyo Co., Ltd., Adesakaiser C79] Polyester modified silicone resin... 05 parts [manufactured by Shin-Etsu Silicone Co., Ltd., X-24-8300] Methyl ethyl ketone...
・・・・・・80 parts cyclohexanone・・・・・・
... 10 parts (Example 4) The same procedure as in Example 1 was carried out except that the second image-receiving layer forming coating liquid was changed to the following composition.

Coating liquid for forming second image-receiving layer: Polyvinyl chloride...94 parts [manufactured by Shin-Etsu Chemical Co., Ltd., TK60 [1] Polyester-modified silicone resin...0.5 part [Shin-Etsu Silicone Co., Ltd.
manufactured by X-24-8300] Ultraviolet absorber...
...01 part [manufactured by Mitsui Toatsu Dye Co., Ltd., M B
T-173] Methyl ethyl ketone...
80 parts cyclohexanone 10
(Example 5) The transferred image obtained in Example 1 was passed through a heat roll heated and pressed at 130°C.

(Example 6) The transferred image obtained in Example 4 was passed through a heat roll heated and pressed at 130°C.

(Comparative Example) Example I except that the first image-receiving layer was formed using the second image-receiving layer forming coating liquid of Example 1 instead of the first image-receiving layer forming coating liquid of Example 1. I did the same thing.

(Comparative Example 2) In place of the coating liquid for forming the second image receiving layer of Example 3, Example 3 was used.
Example 1 was carried out in the same manner as in Example 1, except that the second image-receiving layer was formed using the coating liquid for forming the first image-receiving layer.

Table 1 Transfer flow rate Heat resistance Light resistance Fixability Bleeding Example 1 0 0 0 0 0 Example 2 o ○ ○ ○ ○ Example 3 0 0 0 0 0 Example 4 0 0 0 0 0 Example 5 0 0 0 0 0 Example 6 0 0 0 0 0 Comparative Example 1 △ × × ○ ○ Comparative Example 2 0 0 0 Excellent fixation of pigments from ink sheets,
Moreover, the obtained images have excellent storage stability, and the dye hardly bleeds during storage.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of an image-receiving sheet for thermal transfer recording of the present invention. DESCRIPTION OF SYMBOLS 1... Base material, 2a... First image receiving layer, 2a... Second image receiving layer. Figure 1

Claims (3)

[Claims] (1) A first image-receiving layer and a second image-receiving layer are laminated in this order on a support, and the heat-diffusible dye receptivity of the first image-receiving layer is higher than that of the second image-receiving layer. An image-receiving sheet for thermal transfer recording that is characterized by its large size. (2) The image-receiving sheet for thermal transfer recording according to claim 1, wherein the first image-receiving layer has a thickness of 3 μm or more. (3) The image-receiving sheet for thermal transfer recording according to claim 1, wherein the second image-receiving layer has a thickness of less than 3 μm.