JP3078335B2 - Image receiving sheet for thermal transfer recording - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image-receiving sheet for thermal transfer recording, and more particularly, to an image-receiving sheet for thermal transfer recording which is excellent in heat resistance and light storage stability of an image and can prevent yellowing during storage. Regarding the sheet.

[0002]

2. Description of the Related Art In recent years, as a method for obtaining a color hard copy, ink jet,
A color recording technique using electrophotography, thermal transfer, or the like is being studied.

Of these, the thermal transfer recording system is particularly
It has many advantages, such as easy operation and maintenance, downsizing of the device, and cost reduction.

In the thermal transfer method, a transfer sheet having a fusible ink layer on a support is image-wise heated by a laser or a thermal head, so that the fusible ink layer is melt-transferred onto a transfer sheet. And a thermal diffusion transfer method (a sublimation method) in which a transfer sheet having an ink layer containing a heat-diffusible dye (for example, a sublimable dye) on a support is used to diffuse and transfer only the heat-diffusible dye to a transfer sheet. Transfer method).

In the latter thermal diffusion transfer system, the gradation of an image can be controlled by changing the transfer amount of a thermal diffusible dye in accordance with a change in thermal energy of a thermal head.

Accordingly, the thermal diffusion transfer method has recently been attracting attention as a method capable of transferring and recording a color image having a continuous change in color density by performing cyan, magenta, and yellow overprinting. I have.

[0007] Polyester resins and vinyl chloride resins are generally well known as an image receiving layer for an image receiving sheet. Polyester resins have relatively high sensitivity as compared with vinyl chloride resins, but on the other hand, transfer dyes are used. Was a problem with the discoloration resistance.

To solve this problem, Japanese Patent Application Laid-Open No. Sho 62-2446
Nos. 96 and 63-7971 have been proposed, and although the discoloration resistance has been improved, it has not been sufficient yet.

Japanese Patent Application Laid-Open Nos. 60-24996 and 63-42892 have proposed vinyl chloride resins using vinyl chloride as a main monomer.
However, as a result of experiments by the present inventors, it has become clear that when the sensitivity is improved with a vinyl chloride resin, the color fastness of the dye during heat-resistant storage and light-resistant storage deteriorates.

The present invention has been made in view of the above circumstances.目的 An object of the present invention is to provide an image-receiving sheet for thermal transfer recording, which is excellent in heat-resistant storage stability and light-resistant storage stability of an image and can prevent yellowing during storage.

[0011]

According to the present invention, there is provided an image receiving sheet for thermal transfer recording, comprising an image receiving layer containing a vinyl chloride resin and a ketone resin .

Hereinafter, the present invention will be described in detail.

[1.] Image-Receiving Sheet for Thermal Transfer Recording The image-receiving sheet for thermal transfer recording of the present invention can be composed of a support and an image receiving layer formed thereon.

In some cases, the image-receiving sheet for thermal transfer recording can be formed of a self-supporting image-receiving layer.

In the heat-sensitive transfer recording image-receiving sheet comprising the self-supporting image-receiving layer, the number of components and the number of steps can be reduced because no support is used.

-Support-As a support for the image receiving sheet for thermal transfer recording, for example, paper, coated paper, synthetic paper (polypropylene, polystyrene or a composite material obtained by laminating them with paper), white polyethylene terephthalate base film And a transparent polyethylene terephthalate base film, a transparent polyethylene naphthalate base film, and a polyolefin-coated paper.

The thickness of the support is usually from 20 to 300 μm, preferably from 30 to 300 μm.

-Image receiving layer- The image receiving layer can be formed of a binder and various additives.

Incidentally, in some cases, it can be formed only from a binder.

1. Binder In the invention, it is essential that the binder for the image receiving layer contains at least a vinyl chloride resin and a ketone resin .

Examples of the vinyl chloride resin include a polyvinyl chloride resin and a vinyl chloride copolymer.

Examples of the vinyl chloride copolymer include copolymers of vinyl chloride containing vinyl chloride at a ratio of 50 mol% or more as a monomer unit and other comonomers.

Examples of the other comonomers include vinyl esters of fatty acids such as vinyl acetate, vinyl propylene acid, vinyl cocoate, and vinyl tallowate, acrylic acid,
Acrylic acid or methacrylic acid such as methacrylic acid, methyl acrylate, ethyl methacrylate, butyl acrylate, 2-hydroxyethyl methacrylate, and 2-ethylhexyl acrylate, and alkyl esters thereof, maleic acid, and maleic acid Examples thereof include maleic acid such as diethyl, dibutyl maleate and dioctyl maleate, and alkylalkyl esters thereof, and alkyl vinyl ethers such as methyl vinyl ether, 2-ethylhexyl vinyl ether, lauryl vinyl ether, palmityl vinyl ether, and stearyl vinyl ether. Further, as the comonomer, other halogenated olefins such as ethylene, propylene, acrylonitrile, methacrylonitrile, styrene, chlorostyrene, itaconic acid and its alkyl esters, crotonic acid and its alkyl esters, dichloroethylene and trifluoroethylene, and cyclopentene And the like, such as cycloolefins, aconitic esters, vinyl benzoate, and benzoyl vinyl ether.

The vinyl chloride copolymer may be any of a block copolymer, a graft copolymer, an alternating copolymer, and a random copolymer.

[0025]

[0026]

[0027]

[0028]

[0029]

The ketone resin is composed of ketone and formaldehyde.
By the condensation reaction of Various resins are known depending on the starting ketone, and any of them can be used in the present invention.

Examples of the raw material ketone include methyl ethyl ketone, methyl isobutyl ketone, acetophenone, cyclohexanone, methylcyclohexanone and the like.

A readily available ketone resin and
And Laropearl K80 (manufactured by BASF).

The molecular weight of the heat-resistant resin is not particularly restricted.

In the present invention, it is also possible to use a plurality of kinds of vinyl chloride resins and heat resistant resins which are essential components of the binder of the image receiving layer.

Further, a binder other than the above-mentioned essential binder may be added to such an extent that the object of the present invention is not impaired.

2. Additives A release agent, an antioxidant, a UV absorber, a light stabilizer, a filler (inorganic fine particles, organic resin particles), and a pigment may be added to the image receiving layer. Further, a plasticizer, a heat solvent and the like may be added as a sensitizer.

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

Examples of such release agents include silicone oils (including those called silicone resins); solid waxes such as polyethylene wax, amide wax, and Teflon powder; fluorine-based and phosphate-based surfactants Agents, among which silicone oil is preferred.

This silicone oil is classified into a type that is simply added (simple addition type) and a type that is cured or reacted (curing reaction type).

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

As the modified silicone oil, polyester-modified silicone resin (or silicone-modified polyester resin), acryl-modified silicone resin (or
Silicon-modified acrylic resin), urethane-modified silicone resin (or silicon-modified urethane resin), cellulose-modified silicone resin (or silicon-modified cellulose resin), alkyd-modified silicone resin (or silicon-modified alkyd resin), epoxy-modified silicone resin ( Alternatively, a silicon-modified epoxy resin) can be used.

That is, a polyester-modified silicone resin containing a polysiloxane resin in the main chain and copolymerizing polyester in a block form, and a silicon-modified polyester resin having a dimethylpolysiloxane portion as a side chain bonded to the polyester main chain. Block copolymers, alternating copolymers, graft copolymers, random copolymers, and the like of dimethylpolysiloxane and polyester can also be used as the modified silicone oil or resin.

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

Typical polyester-modified silicone resins include, for example, a block copolymer of a polyester, which is a copolymer of diol and dibasic acid or a ring-opening polymer of caprolactone, and dimethylpolysiloxane (both dimethylpolysiloxane). (Including copolymers in which the terminal or one end is blocked with the polyester moiety, or conversely, the polyester is blocked with dimethylpolysiloxane.) Copolymers obtained by binding siloxane can be mentioned.

The addition amount of these simple addition type silicone oils cannot be determined uniformly because they may vary in various ways depending on the type thereof, but generally speaking, generally, the binder for the image receiving layer is usually used. 0.5 to 50% by weight, and preferably 1 to 20% by weight.

As the curing reaction type silicone oil,
Reaction curing type, light curing type, catalyst curing type and the like can be mentioned.

As the reaction-curable silicone oil, there is one obtained by reacting and curing an amino-modified silicone oil and an epoxy-modified silicone oil.

Further, KS-705F-PS and KS-705 are catalyst-curable or photo-curable silicone oils.
F-PS-1, KS-770-PL-3 [both catalyst-curable silicone oils: manufactured by Shin-Etsu Chemical Co., Ltd.], KS
-720, KS-774-PL-3 [all are photocurable silicone oils: manufactured by Shin-Etsu Chemical Co., Ltd.] and the like.

The addition amount of these curable silicone oils is preferably 0.5 to 30% by weight of the binder for the image receiving layer.

The release agent layer may be provided on a part of the surface of the image receiving layer by dissolving or dispersing the above release agent in an appropriate solvent and applying the resultant, followed by drying.

Next, as the antioxidant, JP-A-59
182785, 60-130735, JP-A-1-1-1
The antioxidants described in 27387 and the like, and known compounds for improving the image durability of photographs and other image recording materials can be mentioned.

The UV absorber and the light stabilizer include:
JP-A-59-158287, JP-A-63-74686,
Nos. 63-145089, 59-196292, 62-229594, 63-122596, and 61
Compounds described in JP-A-283595, JP-A-1-204788 and the like, and compounds known to improve image durability in photographs and other image recording materials can be mentioned.

Examples of the filler include inorganic fine particles and organic resin particles. Examples of the inorganic fine particles include silica gel, calcium carbonate, titanium oxide, acid clay, activated clay, and alumina. Examples of the organic fine particles include resin particles such as fluororesin particles, guanamine resin particles, acrylic resin particles, and silicon resin particles. Can be mentioned. These inorganic / organic resin particles vary depending on the specific gravity, but are preferably added at 0.1 to 70% by weight.

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

Examples of the plasticizer include phthalic esters (eg, dimethyl phthalate, dibutyl phthalate, dioctyl phthalate, didecyl phthalate, etc.) and trimellitic esters (eg, octyl trimellitate, isononyl trimellitate) Esters, trimellitic acid isodesol ester, etc.), pyromellitic esters such as octyl pyromellitic acid ester, adipates (dioctyl adipate, methyl lauryl adipate, di-2-ethylhexyl adipate, ethyl adipate) Lauryl, etc.), other oleates, succinates, maleates, sebacates, citrates, epoxidized soybean oil, epoxidized linseed oil, epoxystearate epoxys, and Acid triphenyl, orthophosphoric acid esters such as tricresyl phosphate, triphenyl phosphite, tris-tridecyl phosphite, dibutyl
Examples thereof include phosphites such as hydrogen phosphite and glycol esters such as ethylphthalylethyl glycolate and butylphthalylbutyl glycolate.

In the present invention, the total amount of the additives is usually in the range of 0.1 to 50% by weight based on the binder for the image receiving layer.

[2] Production of heat-sensitive transfer recording image-receiving sheet The image-receiving sheet for heat-sensitive transfer recording of the present invention is prepared by dispersing or dissolving the components for forming the image-receiving layer in a solvent, and preparing a coating solution for the image-receiving layer. The coating liquid for the image receiving layer can be produced by a coating method in which the coating liquid is applied to the surface of a support and dried.

Further, it can also be produced by a lamination method or the like in which a mixture having the components for forming the image receiving layer is melt-extruded and laminated on the surface of a support.

Examples of the solvent used in the coating method include conventionally known solvents such as water, alcohol, methyl ethyl ketone, toluene, dioxane and cyclohexanone.

When the above-described laminating method is employed, a co-extrusion method 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 of the support.

The thickness of the image receiving layer formed on the surface of the support is generally about 2 to 50 μm, preferably about 3 to 20 μm.

On the other hand, when the image receiving layer itself forms an image receiving sheet for thermal transfer recording because the image receiving layer is self-supporting, the thickness of the image receiving layer is about 60 to 200 μm, preferably about 90 to 150 μm.

In this thermal transfer recording image-receiving sheet, in order to more effectively prevent the fusion of the thermal transfer recording ink sheet with the ink layer, a release agent (the silicone resin, a denaturing agent) was added to the surface of the image-receiving layer. A release layer containing a silicone resin, a silicone oil film or a cured product thereof may be further laminated.

The thickness of the release layer is usually from 0.03 to 2.
0 μm.

The thermal transfer recording image-receiving sheet of the present invention may have a cushion layer or a barrier layer between the support and the image-receiving layer.

By providing a cushion layer, an image corresponding to image information can be transferred and recorded with good reproducibility with little noise.

Examples of the material constituting the cushion layer include urethane resin, acrylic resin, ethylene resin, butadiene rubber, epoxy resin and the like.

The thickness of the cushion layer is usually 1 to 50 μm.
m, preferably 3 to 30 μm.

The provision of the barrier layer can prevent the dye from diffusing into the support and prevent the dye from bleeding into the support.
Examples of the material constituting the barrier layer include a hydrophilic binder such as gelatin and casein, and a polymer having a high Tg.

[3] Thermal Transfer Recording Ink Sheet The thermal transfer recording ink sheet can be composed of a support and an ink layer formed thereon.

-Ink Layer- The ink layer basically contains a heat diffusing dye and a binder.

1. Thermal diffusible dyes Thermal diffusible dyes include cyan, magenta and yellow dyes.

The cyan dye is described in JP-A-59-7.
Nos. 8896, 59-227948, 60
Nos. 24966, 60-53563, and 6
Nos. 0-130735, 60-131292, 60-239289, and 61-19396.
Gazette, JP-A-61-22933, JP-A-61-2129
No. 2, No. 61-31467, No. 61-359
Nos. 94, 61-49893, 61-14
Nos. 8269 and 62-191191 and 63
-91288, 63-91287, 6
Examples include naphthoquinone dyes, anthraquinone dyes, and azomethine dyes described in JP-A-3-290793.

The magenta dye is described in JP-A-59-1984.
No. 78896, JP-A-60-30392, JP-A-60-30394, JP-A-60-25359
No. 5, JP-A-61-262190, JP-A-62-262190
Anthraquinone dyes, azo dyes, azomethine dyes described in JP-A-3-5992, JP-A-63-205288, JP-A-64-159, JP-A-64-63194, etc. And the like.

The yellow dye is described in JP-A-59-78.
896, JP-A-60-27594, JP-A-60-31560, JP-A-60-53565, JP-A-61-12394, JP-A-63-12.
Examples thereof include methine dyes, azo dyes, quinophthalone dyes and anthrisothiazole dyes described in each publication such as No. 2594.

Particularly preferred as the heat-diffusing dye is a compound having an active methylene group of an open-chain type or a closed type, which is obtained by oxidizing a p-phenylenediamine derivative or p-phenylenediamine.
Azomethine dyes obtained by a coupling reaction with an oxidized form of an aminophenol derivative and indoaniline obtained by a coupling reaction with an oxidized form of a phenol or naphthol derivative or a p-phenylenediamine derivative or an oxidized form of a p-aminophenol derivative It is a pigment.

The thermal 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 a single color. Also, depending on the color tone of the image to be formed,
Any two or more of the three dyes or other heat-diffusible dyes may be included.

The amount of the heat diffusing dye used is usually from 0.1 to ²⁰ g, preferably from 0.2 to 5 g per m ^{2 of} the support.
g.

2. Binders As binders for the ink layer, cellulose resins such as ethylcellulose, hydroxyethylcellulose, ethylhydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, cellulose acetate and cellulose acetate butyrate; polyvinyl alcohol, polyvinyl formal, polyvinyl butyral; Polyvinylpyrrolidone,
Polyester, polyvinyl acetate, polyacrylamide,
Examples thereof include vinyl resins such as polyvinyl acetoacetal, styrene resin, styrene copolymer resin, polyacrylate, polyacrylic acid, and acrylic acid copolymer, rubber resins, ionomer resins, and olefin resins.

Among these resins, polyvinyl butyral, polyvinyl acetoacetal or cellulose resin having excellent acid resistance is preferable.

As the above-mentioned various binders, one kind thereof can be used alone, or two or more kinds thereof can be used in combination.

The weight ratio of the binder to the heat diffusible dye is preferably from 1:10 to 10: 1, and particularly preferably from 2: 8 to 8: 2.

3. Other Optional Ingredients Further, various additives can be added to the ink layer as long as the object of the present invention is not impaired.

The additives include silicone resin, silicone oil (reaction curing type is also possible), silicone-modified resin, fluororesin, surfactant, and peelable compounds such as waxes, metal fine powder, silica gel, metal oxide Agent, filler such as carbon black, resin fine powder, etc., curing agent capable of reacting with binder component (for example, radiation-active compounds such as isocyanates, acrylics and epoxies)
And the like.

Further, as an additive, a heat-fusible substance for promoting transfer, for example, compounds described in JP-A-59-106997, such as waxes and higher fatty acid esters, may be mentioned.

-Support-As the support of the ink sheet for thermal transfer recording, any material can be used as long as it has good dimensional stability and can withstand heat during recording with a thermal head. Heat-resistant plastic films such as thin paper, polyethylene terephthalate, polyethylene naphthalate, polyamide, polycarbonate, polysulfone, polyvinyl alcohol cellophane, and polystyrene can be used.

The thickness of the support is preferably 2 to 10 μm. The support has an undercoat layer for the purpose of improving the adhesion to the binder and preventing transfer and dyeing of the dye to the support. May be.

Further, the back surface of the support (the side opposite to the ink layer)
In order to prevent the head from fusing, sticking or wrinkling, the head may be provided with a sticking prevention layer.

The thickness of the anti-sticking layer is usually
It is 0.1 to 1 μm.

The shape of the support is not particularly limited.
For example, there are arbitrary shapes such as wide sheets and films, narrow tapes and cards.

[4] Production of Ink Sheet for Thermal Transfer Recording The ink sheet for thermal transfer recording is prepared by dispersing or dissolving the above-mentioned various components forming an ink layer in a solvent to prepare a coating liquid for forming an ink layer. This can be produced by applying the composition on the surface of a support and drying it.

The binder is used alone or in combination of two or more dissolved in a solvent or dispersed in latex.

Examples of the solvent include water, alcohols (eg, ethanol, propanol), cellosolves (eg, methyl cellosolve, ethyl cellosolve), aromatics (eg, toluene, xylene, chlorobenzene), ketones (eg, acetone, methyl ethyl ketone). ), Ester solvents (eg, ethyl acetate, butyl acetate, etc.), ethers (eg, tetrahydrofuran, dioxane),
Chlorine solvents (for example, chloroform, trichloroethylene) and the like can be mentioned.

For the coating, a conventionally known surface-separated coating method using a gravure roll, an extrusion coating method, a wire bar coating method, a roll coating method and the like can be adopted.

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 containing a binder and a yellow dye. The layer, the magenta ink layer containing the binder and the magenta dye, and the cyan ink layer containing the binder and the cyan dye are formed on the entire surface or a part of the surface of the support at a constant repetition along the planar direction. May be.

The thickness of the ink layer thus formed is usually from 0.2 to 10 μm, preferably from 0.3 to 3 μm.
μm.

In the present invention, the ink sheet for thermal transfer recording may be provided with perforations or provided with detection marks for detecting the positions of areas having different hues, thereby facilitating use. .

The thermal transfer recording ink sheet is not limited to the configuration including the support and the thermal layer formed thereon, and other layers may be formed on the surface of the ink layer.

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

[5] Formation of Image (Thermal Transfer Recording) In order 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 of the present invention are overlapped. Thermal energy is applied imagewise to the interface of the image receiving layer.

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

As a result, an image is formed on the image receiving layer.

Since the image receiving layer of the present invention for heat-sensitive transfer recording has an image receiving layer containing a vinyl chloride-based resin and a heat-resistant resin, the image-receiving layer is excellent in heat-resistant storage stability and light-resistant storage stability during storage, and has a yellowish color. Generation can be prevented.

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

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

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

In this case, a laser light absorbing material (for example, carbon black or an infrared absorbing material in the case of a semiconductor laser) may be present in the ink layer or in the vicinity of the ink layer in order to easily absorb the laser light.

When a laser beam is used, the thermal transfer recording ink sheet and the thermal transfer recording image receiving sheet may be sufficiently adhered to each other.

If a dot generator having a built-in acousto-optical element is used, heat energy corresponding to the size of a halftone dot can be applied.

When an infrared flash lamp is used as a heat source for applying thermal energy, the heating may be performed through a colored layer such as black as in the case of using laser light.

Alternatively, the heating may be performed through a pattern such as black or the like which continuously expresses the shading of an image or a halftone dot pattern, or may correspond to a color layer such as black on one side and a negative of the pattern. Heating may be performed in combination with a negative pattern.

The thermal energy may be applied from the thermal transfer recording ink sheet side, from the thermal transfer recording image receiving sheet side, or from both sides, with priority given to the effective use of thermal energy. If this is done, it is desirable to carry out from the thermal transfer recording ink sheet side.

By the above-described thermal transfer recording, an image of one color can be recorded on the image receiving layer of the image receiving sheet for thermal transfer recording. However, according to the following method, a color image of a color photograph consisting of a combination of each color can be obtained. Can also.

For example, by sequentially changing the yellow, magenta, cyan and, if necessary, black heat-sensitive transfer recording heat-sensitive sheets and performing heat transfer in accordance with each color, a color photographic color image composed of a combination of each color is obtained. You can also.

The following method is also effective. That is, instead of using the thermal transfer recording ink sheet of each color as described above, a thermal transfer recording ink sheet having an area previously formed separately for each color is used.

Then, first, the yellow color separation image is thermally transferred using the yellow area, then the magenta color separation image is thermally transferred using the magenta area, and thereafter, yellow, magenta, and cyan are sequentially repeated. And, if necessary, a method of thermal transfer in the order of the black color separation image.

Although this method can produce color photographic color images, it is more advantageous that this method does not require replacement of the heat-sensitive transfer recording heat-sensitive sheet as described above. There is.

[0119]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In the following, "parts" means "parts by weight" of solid content.

Example 1 A coating liquid for forming an ink layer having the following composition was dried by a wire bar coating method on a corona-treated surface of a polyethylene terephthalate film having a thickness of 6 μm (manufactured by Toray Industries, Inc.) as a support. After coating and drying so as to have a thickness of 1 μm, apply one or two drops of silicone oil [X-41, 4003A, manufactured by Shin-Etsu Silicone Co., Ltd.] with a dropper to the back surface that has not been corona-treated, and apply it over the entire surface. The ink sheet for thermal transfer recording was obtained by spreading and applying a back surface treatment coat.

Coating liquid for forming ink layer Disperse dye 4 parts [Kayaset Blue 714, manufactured by Nippon Kayaku Co., Ltd.] Polyvinyl butyral 5 parts [degree of polymerization 1700, trade name BX-1 manufactured by Sekisui Chemical Co., Ltd.] Methyl ethyl ketone 90 parts Cyclohexanone 5 parts .

Next, a coating liquid for forming an image receiving layer having the following composition was applied to a 100-μm-thick white pet (W-400, manufactured by Diafoil Co., Ltd.) as a substrate by a wire-bar coating method. , And then dried in an oven at a temperature of 100 ° C. for 1 hour to obtain an image receiving sheet for thermal transfer recording in which an image receiving layer having a thickness of 5 μm was formed on a white pet.

Coating liquid heat-resistant resin for forming image receiving layer : 2 parts [Lalopearl A81, manufactured by BASF, ketone resin] Vinyl chloride resin ...・ ・ ・ ・ ・ ・ ・ ・ 7.5
Department [MR-110, Nippon Zeon Co., Ltd., OH groups, vinegar
Sulfonic acid, epoxy-containing vinyl chloride resin] polyester-modified silicone resin ........ 0.5
Part [Shinetsu Silicon Co., Ltd., X-24-8300] methylethylketone ............ 40 parts.

Next, the thermal transfer recording ink sheet and the thermal transfer recording image receiving sheet are overlapped so that the surface of the former ink layer and the surface of the latter image receiving layer are in contact with each other. Using a thermal head from the support side, output 0.4 W / dot, pulse width 0.3-1
The image was recorded by heating under the conditions of 0 msec and a dot density of 6 dots / mm.

After the image recording, the presence or absence of fusion between the ink sheet for thermal transfer recording and the image receiving sheet for thermal transfer recording, the transfer density on the surface of the image receiving layer of the image receiving sheet for thermal transfer recording, and the heat-resistant storage stability of the image are as follows. Evaluation was based on criteria.

Table 1 shows the results.

Transfer density: The cyan reflection density OD value was measured with an optical densitometer (X light). ◇ Heat-resistant storage stability: The image-receiving sheet for thermal transfer recording on which an image was recorded was held for 72 hours in an environment of 77 ° C. and a relative humidity of 80%, and the presence or absence of dye bleed-out was examined. Further, the residual ratio of the cyan dye after heat-resistant storage was determined.残存 Residual rate = Cyan density before storage / Cyan density after storage.黄 Yellowish white background: Yellow density was measured. ◇: The pigment hardly falls off even when the image is rubbed by hand. Ｘ X: The pigment falls off when the image is rubbed by hand.光 Light fastness of image: The image receiving sheet for thermal transfer recording on which the image was recorded was stored for 72 hours with a xenon fade meter (70000 lux), and the residual ratio of cyan density was determined.有無 Yellowness: A heat-resistance test and a light-resistance test were similarly performed on the image-receiving sheet for thermal transfer recording on which no image was recorded, and the yellow density was measured. As for the yellow density, the reflection density was measured with an X light.

[0128]

[0129]

[0130]

[0131]

[0132]

[0133]

[0134]

Comparative Example 1 An image was formed in the same manner as in Example 1 except that the components of the coating solution for forming an image receiving layer were changed as follows. Table 1 shows the results.

Coating Solution for Forming Image Receiving Layer Vinyl Chloride Resin 9.5 parts [Ryuron QC-640, manufactured by Tosoh Corporation, vinyl chloride-vinyl propionate Polymer] Polyester-modified silicone resin... 0.5 part [manufactured by Shin-Etsu Silicon Co., Ltd., X-24-8300 \ methyl ethyl ketone ... 40 parts.

Comparative Example 2 An image was formed in the same manner as in Example 1 except that the composition of the image-receiving layer forming coating liquid in Example 1 was changed to the following composition. Table 1 shows the results.

9.5 parts [Lalopearl A101, manufactured by BASF, ketone resin] Polyester modified silicone resin 1 part [Shin-Etsu Silicon Co., Ltd., X-24-8300 \ methyl ethyl ketone 0.5 part.

[0139]

[Table 1]

[0140]

The image-receiving sheet for heat-sensitive transfer recording of the present invention comprises:
It has excellent heat and light storage stability, and prevents yellowing during storage.

Accordingly, the image receiving sheet for thermal transfer recording of the present invention can maintain high image quality for a long period of time.

Claims (1)

(57) [Claims] 1. An image receiving sheet for thermal transfer recording, comprising an image receiving layer containing a vinyl chloride resin and a ketone resin .