JPH05301475A - Thermal transfer image receiving material - Google Patents

Abstract

PURPOSE:To increase image density and to improve the storage stability, especially, light fastness of an image by forming a receiving layer compsed of a dye receiving thermoplastic resin containing a compd. represented by a specific general formula on a support. CONSTITUTION:A dye receiving thermoplastic resin such as a polyester resin, a polyvinyl resin, a polycarbonate resin or a polyurethane resin is dissolved in a proper solvent and a predetermined amount of a compd. represented by formula I [wherein R<1> and R<2> are a hydrogen atom, an alkyl group or an aryl group, R<3> is a hydrogen atom or a 1-18C alkyl group, A is an (m+n) valent org. residue and m and n are an integer of 0-2 and set to 4>=m+n>=1] is added to and dispersed in the resulting solution to prepare a coating solution for a dye receiving layer. This coating solution is applied to a support such as synthetic paper, paper or a plastic film and dried to form the dye receiving layer to obtain a thermal transfer image receiving material. An intermediate layer having cushioning function can be provided between the support and the receiving layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer image receiving material used in a thermal transfer recording method, and more particularly to a thermal transfer image receiving material capable of obtaining an image having a high density and excellent image storage stability.

[0002]

2. Description of the Related Art In recent years, with the rapid development of the information industry, various information processing systems have been developed, and recording methods and apparatuses suitable for the respective information processing systems have also been developed and adopted. As one of such recording methods, the thermal transfer recording method has been widely used recently because the apparatus used is lightweight and compact, has no noise, is excellent in operability and maintainability, and can be easily colorized. .. This thermal transfer recording method is roughly classified into two types: a heat melting type and a heat transfer type. In the latter method, a thermal transfer dye-donor material having a dye-donor layer containing a binder and a heat transferable dye on a support is superposed on a thermal transfer image-receiving material, and heat is applied from the support side of the dye-donor material, and a heat-applied pattern is applied. It is a method in which a heat transferable dye is transferred to a recording medium (heat transfer image receiving material) in a uniform manner to obtain a transferred image. Here, the heat transferable dye means a dye which can be transferred from the thermal transfer dye-donating material to the thermal transfer image-receiving material by sublimation or diffusion in a medium.

[0003]

However, an image obtained by using a conventional thermal transfer image-receiving material has an insufficient image density, or the storage stability of the image, particularly, the light fastness is not sufficient, so that the image is exposed to sunlight. Further, when exposed to fluorescent light or the like, there are problems that the hue of the image changes and the image density decreases.

[0004]

In the thermal transfer image-receiving material having an image-receiving layer containing a thermoplastic resin capable of receiving a dye on a support, at least one of the image-receiving material constituting layers is provided. And a compound represented by the following general formula [I] is contained in the thermal transfer image receiving material.

[0005]

[Chemical 2]

In the general formula [I], A is represented by the general formula [II].

[0007]

[Chemical 3]

In the formula, R ²⁰ is a hydrogen atom or a hydroxyl group, a carboxyl group (or a salt thereof), an ester, a sulfonic acid (or a salt thereof, or an ester thereof), a halogen atom, a substituted or unsubstituted C 1-18 group. , An alkyl group,
It is an aryl group, B is a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms, which may be the same or different from each other, a is 0 or 1, and b is a (m + n) valence. Represents the number of organic residues. Conventionally, a means for improving the storage stability of an image by adding an anti-fading agent to the image receiving layer has been considered. Examples thereof include JP-A-63-74686, JP-A-64-42285, and JP-A-59-158289. However, the compounds described in these patent specifications show almost no light fastness effect, or slightly. However, the transferred heat-transfer dye diffuses in the image-receiving layer through these compounds, resulting in storage stability of the transferred image, especially retransfer of the image when stored under high temperature conditions, or image bleeding. It caused a bad effect such as deterioration. On the other hand, it is surprising that the compound used in the present invention remarkably improves the light fastness, and it has been found that the compound rather improves the image density, image bleeding, etc. which are actually concerned. This specific effect is shifted to the property of having affinity with the dye-receptive thermoplastic resin and appropriate motility, probably due to the specific chemical structure of the compound used in the present invention.

The support used for the thermal transfer image-receiving material of the present invention is not particularly limited, and any known support can be used. Typical specific examples of the support are shown below. Synthetic paper (polyolefin-based, polystyrene-based, etc.), fine paper, art paper, coated paper, cast coated paper, wallpaper, backing paper, synthetic resin or emulsion-impregnated paper, synthetic rubber latex-impregnated paper, synthetic resin internal paper Paper support such as paperboard, cellulose fiber paper, polyolefin coated paper (especially paper coated on both sides with polyethylene),
Various plastic films or sheets of polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, methacrylate, polycarbonate, etc., and films or sheets treated to give this plastic white reflectivity. Further, a laminate obtained by any combination of the above items 1 to 3 can also be used. Among these, polyolefin-coated paper is preferable because it has features such as no concave deformation due to heating during thermal transfer, excellent whiteness, and little curl.

Regarding the polyolefin-coated paper, for example, "Fundamentals of Photographic Engineering (Silver Salt Photography)" edited by The Photographic Society of Japan.
(Corona Publishing, 1979) pp. 223-240. This polyolefin-coated paper basically comprises a support sheet and a polyolefin layer coated on the surface thereof. The support sheet is made of a material other than synthetic resin, and high quality paper is generally used. The polyolefin coat may be provided by any method as long as it adheres to the surface of the support sheet with the polyolefin layer, but is usually applied by the extrusion method. The polyolefin coat layer may be provided only on the surface of the support sheet on which the image receiving layer is provided, or may be provided on both front and back surfaces. The polyolefin used includes high-density polyethylene, low-density polyethylene, polypropylene and the like, and any of them may be used. However, considering the heat insulation effect during transfer,
It is preferable to use low density polyethylene having a lower thermal conductivity on the side where the image receiving layer is provided. The thickness of the polyolefin coat is not particularly limited, but normally 5 to 100 μm on one side is preferable. However, in order to obtain a higher transfer density, it is preferable that the polyolefin coat on the image receiving layer side is thin. A pigment or filler such as titanium oxide or ultramarine blue for increasing whiteness may be added to the polyolefin coat. Further, the polyolefin-coated paper may have a thin gelatin layer of about 0.05 to 0.4 / m ² on the surface (the side on which the image receiving layer is provided and / or the back surface thereof).

The thermal transfer image receiving material is provided with a dye image receiving layer. This image-receiving layer can function to receive the dye transferred from the thermal transfer dye-donor material during printing and to dye the dye. The image receiving layer contains a thermoplastic resin as a dye receiving resin. The image receiving layer is preferably a film having a thickness of 0.5 to 50 μm. Examples of the dye-accepting thermoplastic resin used in the present invention are given below.

(A) Polyester resin Ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, neopentyl glycol, pyropyrene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, poly Tetramethylene glycol, 1,4-
Diol components such as cyclohexanedimethanol, trimethylolpropane, pentaerythritol, and bisphenol A, and terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, adipic acid, suberic acid, azelaic acid, sebacine Polyester resin obtained by condensation of dicarboxylic acid components such as acid, dodecanedioic acid, 1,4-cyclohexanedicarboxylic acid and trimellitic acid. Specific examples thereof include JP-A-59-101395 and 63-63.
-7971, 63-7792, 63-7973
And No. 60-294862. As commercially available products, Toyon Byron 290, Byron 200, Byron 280, Byron 3
00, Byron 103, Byron GK-140, Byron GK-130, Kao ATR-2009, ATR-
2010 etc. can be used. Table 1 shows specific component types and ratios of these polymers. The structure of the component species is shown in the footnote of Table 1.

[0013]

[Table 1]

(B) Polyvinyl resin Polyacrylic acid ester resin or polymethacrylic acid ester resin such as polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polybutyl acrylate resin: polyvinyl acetate resin: styrene acrylate resin: vinyl toluene acrylate resin : Polyvinyl chloride resin, polyacrylonitrile resin, etc. (C) Polycarbonate resin (D) Polyurethane resin (V) Polyamide resin (F) Urea resin (G) Polysulfone resin (H) Polycaprolactone resin In addition to the synthetic resins described above, mixtures or copolymers thereof may also be used. Can be used.

The compound used in the present invention is effective when added to the thermoplastic resin in an amount of 1% or more, but preferably 5% to 50% (% by weight).

Specific examples of the compound represented by the general formula [I] used in the present invention include the following compounds.

[0017]

[Chemical 4]

[0018]

[Chemical 5]

[0019]

[Chemical 6]

[0020]

[Chemical 7]

[0021]

[Chemical 8]

[0022]

[Chemical 9]

The compound represented by the general formula [I] used in the present invention can be easily synthesized by the Knoevenagel reaction. That is, the corresponding aldehyde or ketone and malonnitrile, cyanoacetic acid or its ester can be synthesized by dehydration condensation reaction in the presence of a suitable catalyst (eg, benzoic acid, piperidine, etc.). Next, a synthesis example will be specifically described.

Synthetic Example 26.8 g (0.2 mol) of isophthalic aldehyde was dissolved in 200 ml of benzene, and 0.22 g of benzoic acid and 2.4 ml of piperidine were added thereto. The temperature of this solution is raised to about 70 ° C., and 49.6 g (0.5 mol) of cyanoacetic acid methyl ester is added dropwise over about 30 minutes. After the dropping, the temperature is further raised and the water produced as a by-product is distilled out of the system while reacting under reflux. The reaction is stopped when about the theoretical amount (7.2 ml) of water is produced (it takes about 5 hours, and crystals are precipitated from the middle of the reaction and the reaction solution becomes dispersed). After cooling, the crystals formed are collected by filtration and recrystallized from DMAC. Yield 40 g (yield 67.5%). Melting point; 204 [deg.] C. Confirmed to be the desired product by NMR.

The thermal transfer image-receiving material of the present invention may contain a thermal solvent or a high boiling point organic solvent as a dye-receptive substance or a dye diffusion aid in the image-receiving layer. As a thermal solvent, it is incompatible with the water-soluble binder that is compatible with the dye, and it is solid at room temperature, but melts when heated by the thermal head during transfer (even when mixed and melted with other components). A compound having various properties such as "good" and "not decomposed by heating with a thermal head" is used. Compounds which have a melting point of preferably 35 to 250 ° C., especially 35 to 200 ° C., and have an (inorganic / organic) value <1.5 are preferred. Here, the term "inorganic" or "organic" is a concept for predicting the properties of a compound, and the details are described in, for example, "Chemical field" 11, page 719 (1957). Specific examples of the high boiling point organic solvent and the heat solvent include JP-A Nos. 62-174754 and 62-24.
No. 5253, No. 61-209444, No. 61-200.
No. 538, No. 62-8145, No. 62-9348,
Examples thereof include the compounds described in JP-A Nos. 62-30247 and 62-136646. The high-boiling organic solvent and / or heat solvent can be used alone in the form of being microscopically dispersed in the image-receiving layer, or can be used as a mixture with a dye-receptive polymer. Further, the above high boiling point organic solvent may be used for the purpose of improving sliding property, releasability, curl balance and the like.

The image-receiving layer of the thermal transfer image-receiving material of the present invention may have a constitution in which a substance capable of receiving a heat-transfer dye is provided alone on a support, or a substance capable of receiving a heat-transfer dye is dissolved in water. It may be configured so as to be dispersed and carried in a polar binder. Although various known water-soluble polymers can be used as the water-soluble binder used in the above case, a water-soluble polymer having a group capable of undergoing a crosslinking reaction with a hardening agent is preferable.

The water-soluble polymer used in the present invention includes polyvinyl alcohol, polyvinyl pyridinium,
Vinyl polymers such as cationic modified polyvinyl alcohol and derivatives thereof (JP-A-60-145879, JP-A-60-220750, JP-A-61-143177, and JP-A-61-143177).
1-235182, 61-245183, 61
237681, 61-261089), polyacrylamide, polydimethylacrylamide, polydimethylaminoacrylate, polyacrylic acid or a salt thereof, acrylic acid-methacrylic acid copolymer or a salt thereof, polymethacrylic acid or a salt thereof, Polymers containing acrylic acid such as acrylic acid-vinyl alcohol copolymers or salts thereof (JP-A-60-168651 and JP-A-62-9).
988), starch, oxidized starch, starch acetate, amine starch, carboxyl starch, dialdehyde starch, cationic starch, dextrin, sodium alginate, gelatin, acacia, casein, pullulan, dextran, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxy. Natural polymers such as propyl cellulose or derivatives thereof (JP-A-59-174382 and JP-A-60-262685).
No. 61-143177, No. 61-181679.
No. 61-193879, No. 61-287782), polyethylene glycol, polypropylene glycol, polyvinyl methyl ether, maleic acid-vinyl acetate copolymer, maleic acid-N-vinylpyrrolidone copolymer, maleic acid-alkyl. Synthetic polymers such as vinyl ether copolymers and polyethyleneimine
No. 1-32787, No. 61-237680, No. 61-
No. 277483) and water-soluble polymers described in JP-A-56-58869.

Further, SO ₃ ^- group, COO ^- group, SO ₂ ^-
Various copolymers water-solubilized with a monomer component containing a group or the like can also be used.

The use of gelatin as the water-soluble binder is particularly preferable because the set load can be dried and the drying load is remarkably small. Specifically, lime-processed gelatin, calcium-free lime-processed gelatin, acid-processed gelatin, phthalated gelatin, acetylated gelatin, gelatin and its derivatives such as succinated gelatin, Bull.Soc.Phot.Ja.
Oxygen-treated gelatin as described in Pan, No. 16, P3 (1966), hydrolyzed or oxygen-decomposed products of gelatin can be mentioned.

These water-soluble polymers may be used alone or in combination of two or more. Water-soluble binder and receptive material are the weight ratio receptive material /
Water-soluble binder = 1 to 20, preferably 2 to 10, particularly preferably 2.5 to 7 is used.

When a water-soluble binder is used, an image receiving layer can be obtained by coating and drying an aqueous solution containing a dye receiving substance. As a method for dispersing the receptive substance in the water-soluble binder, any known dispersion method for dispersing the hydrophobic substance in the water-soluble polymer can be used. Typically, a method in which a liquid of a receptive substance dissolved in an organic solvent immiscible with water is mixed with an aqueous solution of a water-soluble binder and emulsified and dispersed, and a latex of a receptive substance (polymer) is aqueous solution of a water-soluble binder. There is a method of mixing with. Even if the aqueous solution is an aqueous solution of a water-soluble dye-receptive resin or a blend solution of the same with a water-soluble polymer having a low dye-receptive property, a dye-receptive fine particle dispersion liquid or the dispersion liquid and a water solution having a low dye-receptive property is used. It may be a blended solution with a hydrophilic polymer. The accepting substance (polymer) of the water-soluble group (e.g. _{COOM, SO 3 M, -O-} SO 3 M, (- OCH 2 C
H ₂ ) _n ; provided that M is an alkali metal ion, n = integer) to prepare a water-soluble polymer, which may be used alone or in combination with the above water-soluble binder. Specific examples of the receptive polymer latex or the receptive water-soluble polymer include (trade name) Plus Coat Z-466 and Z- manufactured by Kyosho Chemical Co., Ltd.
448, Z-455, Z-461, Z-761, Z-7
71, (trade name) PES Resin A-124 made by Takamatsu Yushi
3, A-2141, A-2151, (trade name) Finetex ES-611, ES-65 manufactured by Dainippon Ink Co., Ltd.
0, ES-670, ES-675, ES-850 and the like.

The image-receiving layer may be composed of one layer or two or more layers. When two or more layers are provided, a synthetic resin having a low glass transition point is used for the layer closer to the support, or a high boiling organic solvent or a thermal solvent is used to enhance the dyeing property to the dye, and the outermost layer is used. Is a synthetic resin with a higher glass transition point, or the amount of high-boiling organic solvent or thermal solvent used is reduced to the required minimum, or the surface is not sticky,
Adhesion with other substances, retransfer of dyes to other substances after transfer,
It is desirable to have a structure that prevents failure such as blocking with the thermal transfer dye-providing material. The total thickness of the image receiving layer is 0.5 to 50 μm, particularly 3 to 30 μm, and in the case of a two-layer structure, the outermost layer is 0.1 to 20 μm, particularly 0.2 to 10 μm.
It is preferable that it is within the range.

The thermal transfer image-receiving material of the present invention may have an intermediate layer between the support and the image-receiving layer. The intermediate layer is one of a cushion layer, a porous layer, a dye diffusion preventing layer, or a layer having two or more functions of these, depending on the constituent material,
In some cases, it also serves as an adhesive. The dye diffusion preventing layer plays a role of preventing the heat transferable dye from diffusing into the support. The binder constituting the diffusion preventing layer may be water-soluble or organic solvent-soluble, but a water-soluble binder is preferable, and examples thereof include the water-soluble binders mentioned above as the binder for the image-receiving layer, particularly gelatin.

The porous layer is a layer which prevents the heat applied at the time of thermal transfer from diffusing from the image receiving layer to the support and plays a role of effectively utilizing the applied heat. The liquid of the water-soluble polymer in which bubbles are generated is applied and dried. 3) The liquid of the water-soluble polymer added with the foaming agent is foamed before application or applied, or foamed in the application drying process. 4) It can be formed by a method such as emulsifying and dispersing an organic solvent (preferably a solvent having a boiling point higher than water) in a water-soluble polymer solution, and forming microvoids in the process of coating and drying.

When an organic solvent-soluble binder is used as the porous layer, 1) mechanical bubbles are generated by mechanically stirring synthetic resin emulsion such as polyurethane or synthetic rubber latex such as methylmethacrylate-butadiene. The liquid is applied onto a support and dried, 2) the liquid obtained by mixing the synthetic resin emulsion or synthetic rubber latex with a foaming agent is applied onto the support and dried, and 3) a synthetic resin such as vinyl chloride plastisol or polyurethane, or Styrene
A liquid in which a foaming agent is mixed with butadiene-based synthetic rubber is applied to a support and foamed by heating. 4) A solution in which a thermoplastic resin or synthetic rubber is dissolved in an organic solvent and evaporation compared with the organic solvent. It is difficult to apply a mixed solution with a non-solvent (including one mainly composed of water) having compatibility with the organic solvent and not having solubility to the thermoplastic resin or the synthetic rubber on the support. Methods such as drying to form a microbolus layer can be used. The intermediate layer may be provided on both sides when the image receiving layer is provided on both sides of the support, or may be provided on only one side. The thickness of the intermediate layer is 0.5 to
50 μ, particularly 1 to 20 μ is preferable. The image-receiving layer, cushion layer, porous layer, diffusion-preventing layer, adhesion layer, etc. constituting the thermal transfer image-receiving material of the present invention include silica, clay, talc, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, Synthetic zeolite, zinc oxide,
Fine powder of lithobon, titanium oxide, alumina or the like may be contained.

A fluorescent whitening agent may be used in the thermal transfer image receiving material. For example, see “The Chem” edited by K. Veenkataraman.
istry of Synthetic Dyes ", Volume 5, Chapter 8, JP-A-61
The compound etc. which are described in -143752 etc. can be mentioned. More specifically, stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazolyl compounds, naphthalimide compounds, pyrazoline compounds, carbostyryl compounds, 2,5-dibenzoxazolethiophene compounds, etc. Can be mentioned. The fluorescent whitening agent can be used in combination with an anti-fading agent.

The thermal transfer dye-donating material used in the present invention is a thermal transfer dye-donating material having a dye-donating layer containing a heat-migrating dye on a support, and the dye is thermally transferred and image-received in a pattern in which heat is applied. A thermal transfer dye-providing material having a heat-meltable ink layer (dye-donating layer) on a support for recording by transferring to the image-receiving layer of the material, wherein the ink is melted in a heat-applied pattern. Two types are included, one that is transferred to a thermal transfer image receiving material to perform recording.

In the dye-donor layer, a dye is selected so that a desired hue can be transferred when printed, and if necessary, two or more dye-donor layers having different dyes are formed side by side on one thermal transfer dye-donor material. It may have been done. For example, when an image such as a color photograph is formed by repeatedly printing each color according to the color separation signal, it is desirable that the hue when printing is cyan, magenta, and yellow. Line up the three dye-donor layers containing the dyes to give. Alternatively, in addition to cyan, magenta, and yellow, a dye-donor layer containing a dye that imparts a black hue may be added. It is preferable to provide a mark for position detection at the same time when any one of the dye-donor layers is formed at the time of forming these dye-donor layers, because an ink or a printing step different from the dye-donor layer formation is not required.

As the support of the thermal transfer dye-providing material, any conventionally known one can be used. For example, polyethylene terephthalate; polyamide; polycarbonate; glassine paper; condenser paper; cellulose ester; fluoropolymer; polyether; polyacetal; polyolefin; polyimide; polyphenylene sulfide; polypropylene; polysulfone; cellophane and the like. The thickness of the support of the thermal transfer dye-providing material is generally 2 to
It is 30μ. An undercoat layer may be provided if necessary. Further, a dye diffusion preventing layer made of a hydrophilic polymer may be provided between the support and the dye donating layer. As a result, the transfer density is further improved. As the hydrophilic polymer, the above-mentioned water-soluble polymer can be used.

A slipping layer may be provided to prevent the thermal head from sticking to the dye-donor element. The slipping layer is composed of a lubricating material, with or without a polymeric binder, such as a surfactant, a solid or liquid lubricant or mixtures thereof.

The thermal transfer dye-providing material using a heat transferable dye basically has a dye-providing layer containing a dye and a binder which are sublimated or become mobile by heat on a support. This thermal transfer dye-providing material is prepared by dissolving or dispersing a dye and a binder resin, which are conventionally known to be sublimated or become mobile by heat, in a suitable solvent to prepare a coating solution, which is applied to one surface of a support. , For example, about 0.2-5
It can be obtained by forming a thermal transfer layer by coating and drying at a coating amount that results in a dry film thickness of μ, preferably 0.4 to 2 μ. As the dye useful for forming such a thermal transfer layer, any of the dyes conventionally used in thermal transfer dye-donor materials can be used, but those particularly preferable in the present invention have a small molecular weight of about 150 to 800. It has, and is selected in consideration of transfer temperature, hue, light resistance, solubility in ink and binder resin, dispersibility, and the like.
Specific examples thereof include disperse dyes, basic dyes, oil-soluble dyes, and the like. Among them, Sumikaron Yellow E
4GL, Dianix Yellow H2G-FS, Miketone Polyester Yellow 3GSL, Kayaset Yellow 9
37, Sumikaron Red EFGL, Dianix Red ACE, Miketone Polyester Red FB, Kayasset Red 126, Miketone Fast Brilliant Blue B, Kayaset Blue 136 (all are trade names) and the like are preferably used. Other known heat transfer dyes can be used.

As the binder resin used together with the above-mentioned dye, any of the binder resins known in the art for such purpose can be used, which usually has high heat resistance and migration of the dye when heated. The one that does not interfere with is selected. For example, polyamide resin, polyester resin, epoxy resin, polyurethane resin, polyacrylic resin (for example, polymethylmethacrylate,
Polyacrylamide, polystyrene-2-acrylonitrile), vinyl-based resin Y including polyvinylpyrrolidone Y polyvinyl chloride-based resin (for example, vinyl chloride-vinyl acetate copolymer), polycarbonate-based resin, polystyrene, polyphenylene oxide, cellulose-based resin (For example, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, cellulose acetate hydrogen phthalate, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, cellulose silylacetate), polyvinyl alcohol resin (for example, polyvinyl alcohol, partially saponified polyvinyl butyral, etc.) Alcohol), petroleum resin, rosin derivative, coumarone-indene resin, terpene resin, polyalphine resin (E.g., polyethylene, polypropylene) and the like. Such a binder resin is preferably used in a ratio of about 80 to 600 parts by weight, for example, per 100 parts by weight of the dye.

In the present invention, conventionally known ink solvents can be freely used as the ink solvent for dissolving or dispersing the above dye and binder resin. The production of the ink and its application on the support can be carried out according to known techniques.

In order to prevent sticking due to heat of the thermal head and improve slippage when printing from the back side of the dye-donor material, it is preferable to perform anti-sticking treatment on the side of the support on which the dye-donor layer is not provided. .. For example,
It is preferable to provide a heat-resistant slip layer mainly containing a reaction product of polyvinyl butyral resin and isocyanate, an alkali metal salt or an alkaline earth metal salt of phosphoric acid ester, and a filler. The polyvinyl butyral resin has a molecular weight of about 60,000 to 200,000 and a glass transition point of 80.
From about 110 ° C. and from the viewpoint that there are many reaction sites with isocyanate, the weight percentage of vinyl butyral portion is 1
5 to 40% is preferable. As the alkali metal salt or alkaline earth metal salt of a phosphoric acid ester, Gafac RD720 manufactured by Toho Kagaku Co., Ltd. is used, which is 1 to 50% by weight, preferably 10 to 4% by weight based on the polyvinyl butyral resin.
It is recommended to use about 0% by weight. The heat-resistant slip layer is preferably accompanied by heat resistance in the lower layer, a combination of a synthetic resin that can be cured by heating and its curing agent, such as polyvinyl butyral and polyvalent isocyanate, acrylic polyol and polyvalent isocyanate, cellulose acetate and titanium chelating agent, Alternatively, a combination of polyester and an organic titanium compound may be provided by coating.

The dye-donor element may be provided with a hydrophilic barrier layer for preventing the dye from diffusing toward the support. The hydrophilic dye barrier layer contains hydrophilic materials useful for the intended purpose. In general, excellent results have been obtained with gelatin, poly (acrylamide), poly (isopropylacrylamide), butyl methacrylate grafted gelatin,
Ethyl methacrylate grafted gelatin, cellulose monoacetate, methyl cellulose, poly (vinyl alcohol),
Poly (ethyleneimine), poly (acrylic acid), a mixture of poly (zonyl alcohol) and poly (vinyl acetate), a mixture of poly (vinyl alcohol) and poly (acrylic acid) or cellulose monoacetate and poly (acrylic) Acid). Especially preferred are poly (acrylic acid), cellulose monoacetate or poly (vinyl alcohol).

The dye-donor element may be provided with an undercoat layer. In the present invention, any undercoat layer may be used as long as it has a desired effect, but preferred specific examples include (acrylonitrile-vinylidene chloride-acrylic acid) copolymer (weight ratio 14: 80: 6), (butyl acrylate). -Methacrylic acid-2-aminoethyl-methacrylic acid-2-hydroxyethyl) copolymer (weight ratio 30:20:50), linear / saturated polyester, for example Bostic 7650 (Mhart Inc., Bostic Chemical Group) Alternatively, a chlorinated high density poly (ethylene-trichloroethylene) resin may be used. The coating amount of the undercoat layer is not particularly limited, but it is usually used in an amount of 0.1 to 2.0 g / m ² .

In the present invention, in order to improve the releasability of the thermal transfer dye-donor element and the thermal transfer image-receiving element, in the layers constituting the dye-donor element and / or the image-receiving element, particularly preferably the surface where both materials come into contact. It is preferable to add a release agent to the outermost layer corresponding to the above. As release agents, solid or wax-like substances such as polyethylene wax, amino wax, and Teflon powder: Fluorine-based, phosphate-based surfactants: paraffin-based, silicone-based, fluorine-based oils, etc. Although any of the above releasing agents can be used, silicone oil is particularly preferable. As the silicone oil, in addition to non-modified silicone oil, modified silicone oil such as carboxy-modified, amino-modified or epoxy-modified can be used. As an example, 6-of the technical data of "modified silicone oil" issued by Shin-Etsu Silicone Co., Ltd.
Examples include various modified silicone oils described on page 18B. When used in an organic solvent-based binder, when an amino-modified silicone oil having a group capable of reacting with a crosslinking agent of the binder (for example, a group capable of reacting with isocyanate) is emulsified and dispersed in a water-soluble binder. Is a carboxy-modified silicone oil (for example, Shin-Etsu Silicone Co., Ltd. product name: X-22-371)
0) is effective.

The layers constituting the thermal transfer dye-donating material and the thermal transfer image-receiving material used in the present invention may be cured with a hardener. In the case of curing an organic solvent-based polymer, JP-A Nos. 61-199997 and 58-21539.
The hardeners described in No. 8 and the like can be used. It is particularly preferable to use an isocyanate type hardener for the polyester resin. For curing water-soluble polymers, U.S. Pat. No. 4,678,739, column 41, JP-A-59-1166.
55, 62-245261 and 61-18942.
The hardeners described in the publications are suitable for use. More specifically, aldehyde type hardener (formaldehyde etc.), aziridine type hardener, epoxy type hardener

Etc.), vinyl sulfone type hardener (N,
N'-ethylenebis (vinylsulfonylacetamide) ethane, etc.), N-methylol hardener (dimethylolurea, etc.), or polymer hardener (JP-A-62-234).
No. 157 and the like).

An anti-fading agent may be further used in the heat transfer dye-providing material and the heat transfer image-receiving material. As the anti-fading agent, there are, for example, an antioxidant, an ultraviolet absorber, or a metal complex of some kind. Examples of the antioxidant include chroman compounds, coumarans compounds, phenol compounds (for example, hindered phenols), hydroquinone derivatives, hindered amine derivatives, and spiroindane compounds. The compounds described in JP-A-61-159644 are also effective. Examples of the ultraviolet absorber include benzotriazole compounds (US Pat. No. 3,533,794), 4-thiazolidone compounds (US Pat. No. 3,35).
No. 2,681), benzophenone compounds (JP-A-56-2784, etc.), and other JP-A-54-4853.
5, No. 62-136641, No. 61-88256, and the like. In addition, JP-A-62-2601
The ultraviolet absorbing polymer described in No. 52 is also effective. Examples of the metal complex include U.S. Pat. Nos. 4,241,155, 4,245,018, columns 3 to 36, and 4,254,254.
195, columns 3 to 8, JP-A Nos. 62-174741, 61-88256, pages (27) to (29), Japanese Patent Application No. 62-62.
-234103, 62-31096, and Japanese Patent Application No. 62-62.
There are compounds described in JP-A-230596. Examples of useful anti-fading agents are disclosed in JP-A-62-215272 (1).
25) to (137).

An anti-fading agent for preventing fading of the dye transferred to the image receiving material may be contained in the image receiving material in advance, or may be supplied to the image receiving material from the outside by a method such as transferring from the dye providing material. You may do so. The above-mentioned antioxidant, ultraviolet absorber, and metal complex may be used in combination with each other. Various surfactants can be used in the constituent layers of the thermal transfer dye-donating material and the thermal transfer image-receiving material for the purposes of coating aid, improvement of peeling property, improvement of sliding property, antistatic property, acceleration of development and the like. Nonionic surfactants, anionic surfactants, amphoteric surfactants, and cationic surfactants can be used. Specific examples of these are disclosed in JP-A-62-1
No. 173463, No. 62-183457 and the like. Further, when dispersing a substance capable of receiving a heat transferable dye, a release agent, an anti-fading agent, an ultraviolet absorber, a fluorescent brightening agent and other hydrophobic compounds in a water-soluble binder, an interface as a dispersion aid is obtained. Preference is given to using activators. For this purpose, in addition to the above-mentioned surfactants, JP-A-59-59
The surfactants described on pages 37 to 38 of 157636 are particularly preferably used.

The constituent layers of the thermal transfer dye-providing material and the thermal transfer image-receiving material may contain an organic fluoro compound for the purpose of improving slipperiness, preventing electrification, improving releasability and the like. Typical examples of the organic fluoro compound include JP-B-57-9053, columns 8 to 17, JP-A-61-20944 and JP-A-62-13.
5826 and the like, or a hydrophobic fluorine compound such as an oily fluorine compound such as fluorine oil or a solid fluorine compound resin such as tetrafluoroethylene resin. As a specific example, Daikin ME-313, M manufactured by Daikin Industries, Ltd.
E-413, ME-414, ME-810, MS-44
3, MS-743, MS-043, MS-843, Asahi Glass Co., Ltd., Asahi Guard, AG-530, AG-53.
3 (S), AG-550, AG-650, AG-71
0, AG-730, AG-740, AG-780, AG
-800, Dai-ichi Kogyo Seiyaku Co., Ltd., Erasgand 100
Etc.

A matting agent can be used in the thermal transfer dye-providing material and the thermal transfer image-receiving material. As a matting agent, Japanese Patent Application No. 62-11, such as benzoguanamine resin beads, polycarbonate resin beads, AS resin beads, etc., can be used in the compounds described in JP-A-61-88256, page 29, such as silicon dioxide, polyolefin or polymethacrylate.
There are compounds described in Nos. 0064 and 62-110065.

In the present invention, a heat transfer dye-providing material or a heat transfer image-receiving material is superposed and heat is applied in accordance with image information from any surface, preferably the back surface of the heat transfer dye-providing material, by a heating means such as a thermal head. By applying energy, the dye in the dye-donor layer can be transferred to the thermal transfer image-receiving material according to the amount of heating energy, and a color image with excellent sharpness and resolution can be obtained. The heating means is not limited to the thermal head,
Known materials such as laser light (for example, semiconductor laser), infrared flash, and hot pen can be used.

In the present invention, by combining with a thermal transfer dye-donating material or a thermal transfer image-receiving material, printing using various printers of thermal printing system, facsimile, or image by magnetic recording system, magneto-optical recording system, optical recording system, etc. It can be used to make prints, prints from a television or CRT screen. For details of the thermal transfer recording method, the description in JP-A-60-34895 can be referred to.

[0056]

EXAMPLES The effects of the present invention will be described in more detail below by showing specific examples of the present invention. However, the present invention is not limited to this.

Example 1 (Preparation of thermal transfer dye-donor material) A 5.5 μm-thick polyethylene terephthalate film (Lumirror: Toray) having a heat-resistant slip layer made of a thermosetting acrylic resin on one side was used as a support. A thermal transfer dye-donating layer coating composition having the following composition is applied by wire bar coating on the side opposite to the side on which the heat-resistant slipping layer is provided on the support to form a thermal transfer dye-donating layer having a thickness after drying of 2 μm. Got the material.

Coating composition for forming a thermal transfer dye-donor layer Disperse dye-a 4 g

[0059]

[Chemical 10]

Polyvinyl butyral resin (Denka Butyral 5000-A: manufactured by Denki Kagaku) 4 g Methyl ethyl ketone 40 ml Toluene 40 ml Polyisocyanate (Takenate D110N: Takeda Yakuhin) 0.2 ml

(Production of Thermal Transfer Image Receiving Material 1) As a support, a synthetic paper (YUPO-FPG-15) having a thickness of 150 μm was used.
0: manufactured by Oji Yuka Co., Ltd.), and a coating composition for an image receiving layer having the following composition was applied on the surface by wire bar coating so that the thickness when dried was 10 μm, to prepare a thermal transfer image receiving material 1. After drying with a dryer, the drying was performed in an oven at a temperature of 100 ° C. for 10 minutes.

Thermal Transfer Image Receiving Material Coating Composition for Image Receiving Layer Polyester resin (Vylon 200: manufactured by Toyobo) 20 g Amino-modified silicone oil (KF-857: manufactured by Shin-Etsu Silicone) 1 g Polyisocyanate (KP-90: manufactured by Dainippon Ink) 3 g Invention compound 1,2,3,4,5,6,7,8 4 g Methyl ethyl ketone 85 ml Toluene 85 ml

Example 2 The same material as in Example 1 is used as the thermal transfer dye-providing material. (Preparation of Thermal Transfer Image Receiving Material 2) A thermal transfer image receiving material 2 was prepared by applying an image receiving layer coating composition having the following composition to the surface of a support having the same content as in Example 1 by wire bar coating so that the thickness when dried was 10 μm. Was produced. The drying method was the same as in Example 1.

Thermal Transfer Image Receiving Material Coating Composition for Image Receiving Layer Vinyl Chloride Vinyl Acetate Copolymer Resin (Eslec C: Sekisui Chemical Co., Ltd.) 20 g Amino-modified silicone oil (KF-857: Shin-Etsu Silicone) 1 g Polyisocyanate (KP-90: Large) Nihon Ink) 3g Compound of the present invention 1,2,3 4g Methyl ethyl ketone 85ml Toluene 85ml

Example 3 The same material as in Example 1 is used as the thermal transfer dye-providing material. (Preparation of thermal transfer image receiving material 3) 3 on both sides of 150 μm paper
Prepare resin-coated paper laminated with polyethylene to a thickness of 2 μm and 20 μm, and apply a composition having the same content as the coating composition for the image-receiving layer of the thermal transfer image-receiving material 1 to the surface laminated to a thickness of 32 μm by wire bar coating. Was applied to give a thermal transfer image receiving material 3. The drying method was the same as in Example 1.

Comparative Example 1 The same thermal transfer dye-donating material as in Example 1 is used. (Preparation of Thermal Transfer Image Receiving Material 4) A thermal transfer image receiving material was prepared by coating the surface of a support having the same content as in Example 1 with the coating composition for an image receiving layer having the following composition by wire bar coating so that the thickness when dried was 10 μm. 4 was produced. The drying method was the same as in Example 1.

Thermal Transfer Image Receiving Material Coating Composition for Image Receiving Layer Polyester resin (Vylon 200: Toyobo) 20 g Amino-modified silicone oil (KF-857: Shin-Etsu Silicone) 1 g Polyisocyanate (KP-90: Dainippon Ink) 3 g Comparison No compound or comparative compound A ^* 4 g Methyl ethyl ketone 85 ml Toluene 85 ml * The structure of the comparative compound is shown in the footnote of Table 2.

Comparative Example 2 The same thermal transfer dye-donating material as in Example 1 is used. (Preparation of Thermal Transfer Image Receiving Material 5) A thermal transfer image receiving material was prepared by coating the surface of a support having the same contents as in Example 1 with the coating composition for an image receiving layer having the following composition by wire bar coating so that the thickness when dried was 10 μm. 5 was produced. The drying method was the same as in Example 1.

Thermal Transfer Image Receiving Material Coating Composition for Image Receiving Layer Vinyl Chloride Vinyl Acetate Copolymer Resin (S-REC C: Sekisui Chemical Co., Ltd.) 20 g Amino-modified silicone oil (KF-857: Shin-Etsu Silicone) 1 g Polyisocyanate (KP-90: Large) (Nippon Ink Co., Ltd.) 3 g No comparative compound or comparative compound B ^* 4 g Methyl ethyl ketone 85 ml Toluene 85 ml * The structure of comparative compound B is shown in the footnote of Table 2.

Comparative Example 3 The same thermal transfer dye-donating material as in Example 1 is used. (Preparation of Thermal Transfer Image Receiving Material 6) The coating composition for an image receiving layer having the same content as in Comparative Example 1 was applied on the surface of a support having the same content as in Example 3 by wire bar coating so that the thickness when dried was 10 μm. Thus, a thermal transfer image receiving material 6 was produced. The drying method was the same as in Example 1. The thermal transfer dye-donating material and the thermal transfer image-receiving material obtained as described above are superposed so that the dye-donor layer and the image-receiving layer are in contact with each other, and the thermal head is used from the support side of the thermal transfer dye-donating material to output the thermal head. 0.25 W / dot, pulse width 0.15 to 15 msec, dot density 6 dots / mm
Printing was carried out under the conditions described above, and a magenta dye was dyed imagewise on the image receiving layer of the thermal transfer image receiving material. The reflection density of the portion (Dmax) where the density of the obtained recorded thermal transfer image receiving material was saturated was measured using a status A filter. Also, the obtained image was taken under 12000lux fluorescent lamp tester irradiation.
The light fastness was evaluated as the value of the reflection density of the Dmax portion of the image stored for a week as a value of the reflection density of the image before storage under irradiation. Furthermore, after storing the obtained image for 72 hours under the condition of 80 ° C., as compared with the image before the storage, no image bleeding is observed, ○, some is observed, Δ is markedly recognized. The storability of the image under high temperature conditions was evaluated as x. The above results are shown in Table 2.

[0071]

[Table 2]

[0072]

[Table 3]

[0073]

According to the present invention, a thermal transfer image-receiving material having a high image density and excellent image storage stability can be obtained without adversely affecting the initial image density (reflection density) and the bleeding of the image after storage. You can

Claims (1)

[Claims] 1. A thermal transfer image receiving material comprising an image receiving layer containing a thermoplastic resin capable of receiving a dye on a support,
A thermal transfer image receiving material comprising a compound represented by the following general formula [I] in at least one of the image receiving material constituting layers. [Chemical 1]