JP2000301842A - Image receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image receiver capable of recording in a high density while maintaining releasability from an ink ribbon, bleeding, fading properties of a pigment on a record and solvent resistance and god adhesive properties to the protective layer in the receiver for thermal transfer recording. SOLUTION: In the image receiver with an image receiving layer on a base used for thermal transfer recording, the layer contains 30 to 100 pts.wt. of a vinyl chloride-vinyl acetate copolymer to 100 pts.wt. of a polyvinyl polyacetal resin, further contains at least one type of compound selected from a carboxylic ester and an isocyanate compound in such a manner that a total content of the carboxylic ester and the isocyanate compound is 0.5 to 20 pts.wt. to 100 pts.wt. of the polyvinylacetal resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image receiving member used for thermal transfer recording.

[0002]

2. Description of the Related Art In recent years, as a method for obtaining a color hard copy, a thermal transfer recording method has rapidly spread due to its simplicity, low cost of an apparatus, and ease of maintenance. Since hard copies can be obtained, attention has been paid to the dye transfer system.
In this method, a transfer recording ink ribbon having a coloring material layer mainly composed of a dye and a binder resin on one surface of a base film is heated only at a desired portion according to image information by a heating means such as a thermal head, The dye is transferred onto an image receiving body having a dye-dyeable image receiving layer on the surface of the substrate, and recording is performed.

The following performance is required for an image receiving body of this type. First, during transfer recording, it is easy to peel off from the transfer recording ink ribbon after recording without fusing to the transfer recording sheet. Next, the dyeing property of the dye on the image receiving layer is good, and high density and high gradation recording can be performed. Further, the storage stability of the recorded matter such as dye bleeding, photobleachability, dark fading, and solvent resistance is good. Until now, various additives such as a resin, a release agent, and a light stabilizer for forming an image receiving layer have been proposed in order to satisfy the above-mentioned performance of the image receiving body for transfer recording. For example, JP-A-3-2
No. 27690 and JP-A-4-103391.

Further, in recent years, it has come to be used for producing ID cards such as identification cards, for example, by taking advantage of the feature that images equivalent to photographs of sublimation transfer recording can be obtained. However, as it is, the lightfastness,
There is a problem that durability such as weather resistance and friction resistance is inferior,
As a method for solving the problem, a method of forming a transparent protective layer on an image has been proposed. As a method of forming the protective layer on the image, after forming the image, a method of applying a protective layer on the surface, a method of laminating, or a transfer film having a heat-transferable protective layer on a base material is superimposed on the image. In addition, there is a method of forming a protective layer on an image by transferring the thermal transferable protective layer using a thermal head or a heating roll.

Further, a method has been proposed in which a heat transferable protective layer is formed on a film in the order of the color material layer, and an image is formed on the image receiving layer using the color material layer, and then the protective layer is thermally transferred. Have been. By providing this protective layer, the friction resistance, chemical resistance, solvent resistance, etc. of the image can be improved, but in order to further improve the weather resistance, an additive such as an ultraviolet absorber is added to the protective layer. There is known a method of adding a fluorescent whitening agent to a protective layer in order to add a special function such as addition of a forgery or improvement of sharpness or whiteness of a recorded image. 58-149048, JP-A-62-59076, etc.).

[0006] In order for the protective layer to sufficiently perform these functions, the image receiving layer and the protective layer must be sufficiently bonded. However, for the image receiving layer, the adhesiveness with the protective layer is a performance that is inconsistent with the conventionally required peelability of the color material layer of the ink ribbon. Since it must have good adhesion to the protective layer while maintaining good peelability from the color material layer, further devising of the formulation of the image receiving layer that can be applied to the formation of the protective layer is required It is becoming.

Some of the constituents of the image receiving body of the present invention, polyvinyl acetal resin, vinyl chloride-vinyl acetate copolymer resin, silicone resin, carboxylic acid ester, isocyanate, and silicone oil are included as components of the image receiving layer. As the invention, JP-A-3-227690,
JP-A-4-103391, JP-A-4-32089
No. 0, Japanese Patent Application Laid-Open No. 8-99470 can be cited, but none of them recognizes the problem of achieving both the peelability of the color material layer and the adhesiveness with the protective layer during thermal transfer recording. I can't solve the problem.

[0008]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that the content of carboxylic acid ester and isocyanate as a component of the image receiving layer is reduced at a specific ratio. It has been found that the use of the composition of (1) can provide a good image receiving member which can satisfy both the releasability of the colorant layer at the time of thermal transfer and the adhesiveness to the protective layer.

That is, the gist of the present invention is to provide an image receiving member having an image receiving layer provided on a substrate and used for thermal transfer recording.
The image receiving layer is formed by adding 30 parts by weight of a vinyl chloride-vinyl acetate copolymer resin to 100 parts by weight of a polyvinyl acetal resin.
-100 parts by weight, and further contains at least one compound selected from carboxylic acid esters and isocyanate compounds, and the total content of the carboxylic acid ester and the isocyanate compound is based on 100 parts by weight of the polyvinyl acetal resin. An image receiving body characterized in that the amount is 0.5 to 20 parts by weight. This image receiving body is excellent not only in normal image formation but also in adhesiveness to a protective layer for protecting an image.

Hereinafter, the present invention will be described in detail. As the base of the image receiving body used in the present invention, any of those generally used for a thermal transfer recording image receiving body can be used. For example, various papers formed from cellulose fibers and various synthetic papers synthesized from a synthetic resin can be used. , Plastic film,
And composites of the above materials. Substrate thickness is 1
It is preferably from 0 to 500 µm, particularly preferably from 100 to 300 µm. Examples of the polyvinyl acetal resin used in the image receiving layer of the present invention include polyvinyl acetal, polyvinyl butyral, polyvinyl formal, polyvinyl benzal, and polyvinyl phenyl acetal. These resins can be synthesized by acetalizing polyvinyl alcohol with various desired aldehydes. These resins are represented by the following general formula (1) and have 0 to 30 mol% of hydroxyl groups.

[0011]

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Wherein R ¹ and R ² each independently represent hydrogen, an alkyl group, a phenyl group which may have a substituent or a benzyl group, and k, l, m and n represent % <% Of each constitutional unit, 35 <k + 1 <80, 5 <m <60, 0
<N <30) Among the polyvinyl acetal resins represented by the general formula (1), it is preferable that the polyvinyl acetal resin further contains an acetal group having an aromatic ring, such as benzaldehyde, tolualdehyde, and phenylacetaldehyde. Preferred are acetal resins having an acetal group using aldehydes such as aldehydes and substituted products thereof. In particular, a resin having at least 20 mol% of an acetal group having an aromatic ring is preferable. One having more aromatic rings is more advantageous for adhesion to the protective layer. Examples of other polyvinyl acetal resins include JP-A-3-65391 and JP-A-3-1629.
An acetal resin having an aromatic ring described in JP-A-89-89 can be used.

The vinyl chloride used in the image receiving layer of the present invention
The vinyl acetate copolymer resin is generally called a vinyl chloride resin, and is a resin obtained by copolymerizing vinyl chloride and vinyl acetate. Vinyl chloride resin is hard and brittle, and vinyl acetate resin is soft and elastic. PVC resin has an intermediate performance between the two. Commercially available vinyl chloride resins can also be used. For example, UCAR Solution Vinyl VAGH, VAGD, VAGF, VAG
C, VROH (manufactured by Union Carbide), Denka Vinyl # 1000GK, # 1000GKT, # 1000G
SK (manufactured by Denki Kagaku Kogyo), S-LEC A (manufactured by Sekisui Chemical Co., Ltd.), Nissin MPR-TA, TA5 (manufactured by Nissin Chemical Industry), and the like. The vinyl chloride-vinyl acetate copolymer resin preferably has a hydroxyl group.

The glass transition point (Tg) of the polyvinyl acetal resin and the vinyl chloride-vinyl acetate copolymer resin used in the present invention is preferably from 0 to 150 ° C., particularly preferably from 40 to 120 ° C. If the Tg is too low, the fixability of the dye is poor, and image blur is likely to occur during long-term storage.
On the other hand, if the Tg is too high, the dyeing properties are poor and the image density tends to be low. The mixing ratio of the polyvinyl acetal resin and the vinyl chloride-vinyl acetate copolymer resin is 100 parts by weight of the polyvinyl acetal resin: vinyl chloride-vinyl acetate copolymer resin: 30 to 100 parts by weight, more preferably, 100 parts by weight: 40 to 100 parts by weight.

In the present invention, the image receiving layer contains at least one compound selected from a carboxylic acid ester and an isocyanate compound, and the total content of the carboxylic acid ester and the isocyanate compound is based on 100 parts by weight of the polyvinyl acetal resin. It is 0.5 to 20 parts by weight. A more preferred total content is 1 to 15 parts by weight. As the carboxylic acid ester used in the present invention, any of an aliphatic carboxylic acid ester and an aromatic carboxylic acid can be used, and a fatty acid ester is preferable. Among them, carbon number 8
Esters of the above alcohols and fatty acids having 4 or more carbon atoms are preferable. For example, as alcohols having 8 or more carbon atoms,
Octyl alcohol, 2-ethylhexyl alcohol,
Examples include decyl alcohol, lauryl alcohol, and stearyl alcohol, and examples of the fatty acid having 4 or more carbon atoms include lauric acid, oleic acid, stearyl acid, and adipic acid. The amount of the carboxylic acid ester to be used is 0 to 20 parts by weight, preferably 0 to 10 parts by weight, more preferably 0 to 5 parts by weight based on 100 parts by weight of the polyvinyl acetal resin. It is desirable. If the amount of the carboxylic acid ester is too large, the adhesiveness of the protective layer may be adversely affected.

The isocyanate compound used in the present invention is
Polyfunctional isocyanate compounds, those used in the reaction with a polyoxyalkylene derivative having a hydroxyl group, both unreacted and used in the composition, various diisocyanates, triisocyanates, polyisocyanates can be used, for example, Tolylene diisocyanate, xylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6
-Hexamethylene diisocyanate, isopropylidenecyclohexyl diisocyanate, isophorone diisocyanate, and various derivatives thereof can be used.
The amount of these isocyanate compounds used is 0 to 20 parts by weight, preferably 0 to 10 parts by weight, more preferably 0.5 to 6 parts by weight, based on 100 parts by weight of the polyvinyl acetal resin. It is desirable to add.

If the amount of the isocyanate group is too small than the amount of the functional group in the resin, the effect of crosslinking is not remarkably exhibited, so that fusion with the coloring material layer is liable to occur, and thermal deformation after printing tends to be large. Becomes Conversely, if the amount is too large, the disadvantage that the adhesion of the protective layer is impaired becomes significant. The image-receiving layer of the image-receiving body of the present invention contains the above-described composition as a main component, but may be mixed with another resin or the like as long as the properties of the composition are not impaired. The ratio of the main component to the solid content is 90
% By weight or more.

In the present invention, a silicone resin can be added to the image receiving layer. As the silicone resin, a modifying silicone resin having a hydroxyl group or an alkoxy group as a partial functional group, and a urethane-modified silicone resin, an epoxy-modified silicone resin, a polyester-modified silicone resin, an alkyd-modified silicone resin, an acrylic-modified silicone resin,
A modified silicone resin modified with an organic group having various functional groups such as a melamine-modified silicone resin and a phenol-modified silicone resin can be used. Incidentally, these silicone resins may be used in the form of varnish dissolved in a solvent. The amount of the silicone resin used is 0 to 30 parts by weight, more preferably 0 to 25 parts by weight, based on 100 parts by weight of the polyvinyl acetal resin. If the amount used is too large, tackiness will be seen in the image receiving layer,
Fusing with the color material layer occurs.

The image receiving layer of the present invention may further contain silicone oil as an additive. Examples of the silicone oil include dimethyl silicone oil and various modified silicone oils such as olefin-modified silicone oil, fluorine-modified silicone oil, polyether-modified silicone oil, alcohol-modified silicone oil, carboxy-modified silicone oil, amino-modified silicone oil, and mercapto-modified silicone oil. Silicone oil, epoxy-modified silicone oil and the like can be given.

Among them, it is effective for peeling off from the color material layer,
Amino-modified silicon is preferred in that it does not adversely affect the adhesion of the protective layer, and the amount thereof is 0.5 to 10 parts by weight, more preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the polyvinyl acetal resin. To 5 parts by weight. The other mixture may include, for example, a styrene resin, a vinyl chloride resin, a polyester resin, a polyarylate resin, an acrylonitrile-styrene copolymer resin (AS resin), and the like. Further, in the image receiving layer, an ultraviolet absorber,
Light stabilizers, antioxidants, fluorescent brighteners, antistatic agents, crosslinking accelerators and the like may be added.

The image-receiving layer of the present invention is formed by dissolving the above-mentioned polyvinyl acetal resin, vinyl chloride-vinyl acetate copolymer resin, carboxylic acid ester, isocyanate compound or the like in a suitable solvent, A coating solution may be prepared by adding a resin and additives, applied and dried on a substrate, and then appropriately heated to cure. Various organic solvents can be used as a solvent for preparing the coating solution. For example, alcohol solvents such as methanol, ethanol and propanol, aromatic solvents such as toluene and xylene, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, ester solvents such as ethyl acetate and butyl acetate, tetrahydrofuran, dioxane Or a mixed solvent thereof.

The coating method can be arbitrarily selected from commonly used methods. For example, a method using a reverse roll coater, a gravure coater, a rod coater, an air doctor coater or the like is used. The thickness of the image receiving layer formed on the substrate is usually 0.1 to 20 μm as a dry coating film.
m, preferably 1 to 10 μm. Dry coatings are usually
After coating and drying, it can be cured at a temperature of 40 ° C to 120 ° C for about 6 hours to 1 week.

On the other hand, an ink ribbon for transfer recording used with the image receiving body of the present invention has a coloring material layer mainly composed of a dye and a binder resin on one surface of a base film such as paper or a plastic film. Usually used is a polyethylene terephthalate film. The thickness is 2-10μ
m is normal. As the dye to be used, various nonionic heat diffusing dyes such as azo, anthraquinone, nitro, styryl, naphthoquinone, quinophthalone, azomethine, coumarin, and condensed polycyclic dyes are used. . The binder resin is a thermoplastic resin such as a butyral resin, an acetal resin, a phenoxy resin, and an acrylonitrile-styrene copolymer resin (AS resin).

The protective layer used for protecting the surface of the image receiving body of the present invention can be provided on the image by coating, but is preferably provided on the base material so as to be thermally transferable.
In that case, the protective layer can be provided on the image by heating from the side opposite to the protective layer of the substrate. It may be a sheet in which only a protective layer is provided on a base material, or a sheet in which a color material layer and a protective layer are provided on a base material sequentially. The latter case is simple and preferable because a protective layer can be formed on an image with the same heat source continuously after image formation.

Hereinafter, the case where the protective layer is provided on the base material so as to be capable of thermal transfer will be described, but the usage is not limited thereto. As the substrate on which the protective layer is provided, the same substrate as the ink ribbon substrate for transfer recording used for providing the color material layer can be used. A release adjusting layer for adjusting the releasability of the protective layer may be provided on the surface on which the protective layer is provided. The protective layer preferably has a structure having at least two layers of a surface layer and an adhesive layer from the base material side, but may have a single layer serving as both of them. A heat-resistant layer can be provided on the surface of the substrate opposite to the protective layer.

The surface layer is a layer that becomes the surface after the formation of the protective layer, and its components include various resins having excellent friction resistance, weather resistance, etc., for example, acrylic resin, polyurethane resin, polystyrene resin, polyester It mainly contains a resin, an acrylic urethane resin, a silicone-modified resin of these resins, and a mixture of these resins. Among these resins, acrylic resins are preferred in terms of abrasion resistance and weather resistance. Since these resins form a tough film, the end portions are likely to be insufficiently cut at the time of transfer heated from the opposite surface of the substrate. To improve this, fine particles such as silica and plastic pigment, wax and the like can be added to the surface layer. As a method of forming a surface layer on a substrate, a method similar to the method described in the case of forming a color material layer can be used. The thickness of the surface layer is preferably about 0.3 to 5 μm, and preferably 1 to 3 μm.
It is about.

For the purpose of improving weather resistance and weather resistance, a hindered amine-based light stabilizer, a benzotriazole-based, benzophenone-based or benzoate-based ultraviolet absorber, a metal salt of an acid phosphate, a fine particle inorganic pigment, etc. Can be added. As the hindered amine light stabilizer, those having a piperidine such as 2,2,6,6-tetramethylpiperidine or 1,2,2,6,6-pentamethylpiperidine as a partial structure are preferable,
For example, dimethyl succinate / 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, bis (2,2,6,6-tetramethyl-4-piperidyl) ) Sebacate, screw (1, 2,
2,6,6-pentamethyl-4-piperidyl) sebacate, (poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} (2,2,6,6-tetramethyl-4-piperidyl) imino {hexamethylene} (2,2,6,6-tetramethyl-4-piperidyl) imino}]) and the like.

As the ultraviolet absorber, 2- (5-methyl-2-methyl-2-benzotriazole) is used.
(Hydroxyphenyl) benzotriazole, 2- [2-
Hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2-
(3,5-di-t-butyl-2-hydroxyphenyl)
Benzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chloro Benzotriazole, 2-
(3,5-di-t-amyl-2-hydroxyphenyl)
Benzotriazole, 2- (2'-hydroxy-5'-
t-octylphenyl) benzotriazole and the like, as benzophenone-based ultraviolet absorbers, 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, -Hydroxy-4-methoxybenzophenone, pt-butylphenyl salicylate-2-hydroxy-4-methoxybenzophenone, and the like, and 2,4-di-t-butylphenyl-3 ′, 5 as a benzoate-based ultraviolet absorber. '-Di-t-butyl-
4'-hydroxybenzoate, pt-butylphenyl-salicylate and the like can be mentioned.

Examples of the metal salts of acidic phosphates include stearyl acid phosphate, magnesium stearyl phosphate, aluminum stearyl phosphate, calcium stearyl phosphate, zinc stearyl phosphate, and barium stearyl phosphate. Fine particle inorganic pigments include zinc oxide, tin oxide-based conductive fine powder, titanium oxide, TiO ₂ ・ S
nO ₂ (Sb-doped), barium sulfate-based conductive powder, and the like. Two or more of these additives may be used in combination. The addition amount is suitably 20% or less.

The adhesive layer is made of acrylic resin, vinyl chloride resin, polyester resin, vinyl acetate resin, vinyl chloride
It mainly contains a resin having good adhesiveness when heated, such as a vinyl acetate copolymer resin, a polyamide resin, and a silicone resin. Among them, an acrylic resin, a polyvinyl chloride resin, and a vinyl acetate resin are preferable. Used alone or as a mixture. Since the protective layer is transferred onto the image receiving layer by thermal transfer, the adhesive layer has fluidity or adhesiveness at the transfer temperature and the storage environment after bonding (room temperature ± 2 ° C.).
(0.degree. C.), it is preferable that it is hardened. Therefore, the Tg of the resin used for the adhesive layer is preferably 40
It is not less than 130 ° C and not less than 130 ° C. Vinyl acetate resin is generally T
Since g is low, it is rarely used alone.

The acrylic resin is a necessary component for improving the adhesion between the surface layer and the adhesive layer, particularly when an acrylic resin having excellent weather resistance is used for the surface layer. on the other hand,
The polyvinyl chloride resin and vinyl chloride resin can be expected to improve the adhesiveness to the image receiving layer. Therefore, it is also preferable to mix and use them at a ratio of 1: 4 to 4: 1. In addition, these acrylic resins, polyvinyl chloride resin, for example, for polyester resin,
It was also found that the light fastness of the dye was not adversely affected. The same additives as those for the surface layer may be added as additives for the adhesive layer. The adhesive layer is formed by applying and drying a solution of a resin or an additive in the same manner as for forming the surface layer, preferably to a thickness of about 0.1 to 5 μm. More preferably, it is 0.5 to 3 μm.

In the thermal transfer recording using the image receiving body of the present invention, the image receiving layer of the image receiving body and the color material layer of the color sheet are overlapped, and the dye at a position corresponding to the image information is heated by a point-like heat source such as a thermal head or a laser. Only the operation of transferring onto the image receiving layer can be performed for a plurality of colors (usually three or four colors). Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. In the following, “parts” indicates “parts by weight”.

Example 1 (a) Preparation of Image Receiver Polyvinyl alcohol (99 mol% saponification, polymerization degree 17)
00) was subjected to acetalization with phenylacetaldehyde and butyraldehyde to obtain a polyvinyl phenyl acetal resin represented by the following general formula (2).

[0034]

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The above polyvinyl phenyl acetal resin 6
0 parts, vinyl chloride / vinyl acetate / vinyl alcohol copolymer resin (trade name: Solvain A manufactured by Nissin Chemical Co., Ltd.) 50 parts, denaturing silicone varnish (trade name: TSR-
160, solid content concentration 60%, manufactured by Toshiba Silicon Co., Ltd.)
5 parts, dioctyl adipate (trade name: K-3
220, manufactured by Kao Corporation, 0.6 part, hexamethylene diisocyanate polyfunctional isocyanate compound (trade name:
Mitec NY-710A, solid content concentration 75%, Mitsubishi Chemical Corporation 4 parts, amino-modified silicone oil (trade name: KF393, Shin-Etsu Chemical Co., Ltd.) 0.6 parts, methyl ethyl ketone 300 parts, toluene A liquid obtained by mixing and stirring 300 parts was applied to a 150 μm-thick polypropylene synthetic paper (trade name: YUPO FPG150, manufactured by Oji Yuka Synthetic Paper Co., Ltd.) using a wire bar, and dried (dry film thickness: approx. 5 μm) and further heat-treated in an oven at 70 ° C. for 24 hours to produce an image receiving body. In this case, the ratio of the polyvinyl acetal resin, polyvinyl chloride resin, silicone resin, carboxylic acid ester, and isocyanate is 100: 7.
5: 15: 1: 5.

(B) Preparation of Ink Ribbon 10 parts by weight of a dye represented by the following structural formula (3), 10 parts by weight of polyvinyl butyral resin (BX-1, manufactured by Sekisui Chemical Co., Ltd.), 250 parts of methyl ethyl ketone, and 250 parts of toluene 6 μm of the ink obtained by mixing and stirring
The resulting polyester film was coated and dried using a bar coater to a dry film thickness of 0.5 μm to form a red color material layer. Next, an acrylic resin (trade name: B
Using a bar coater, a liquid obtained by mixing 10 parts by weight of R-100, manufactured by Mitsubishi Rayon Co., Ltd., 1 part by weight of amino-modified silicone oil (trade name: KF393, manufactured by Shin-Etsu Chemical Co., Ltd.) and 89 parts by weight of toluene was used. The coating was dried to a dry thickness of 1 μm to provide a heat-resistant layer.

[0037]

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(C) Formation of protective layer 80 parts of acrylic resin (trade name: BR-100, manufactured by Mitsubishi Rayon Co., Ltd.) and an ultraviolet ray absorbent (2- (3,5-di-t-
A coating liquid obtained by stirring 10 parts of (butyl-2-hydroxyphenyl) benzotriazole, (trade name: TINUVIN320, manufactured by Nippon Ciba Geigy Co., Ltd.), 40 parts of methyl ethyl ketone, and 40 parts of toluene was provided with releasability. It was applied to a film having a thickness of 6 μ to form a resin layer having a dry thickness of 2 μ. Furthermore, as an adhesive layer, a polyvinyl chloride resin (trade name: VYHH, Tg72 ° C., manufactured by Union Carbide) and an acrylic resin (trade names: BR-107, Tg5)
An equivalent amount of a methyl ethyl ketone solution (0 ° C., manufactured by Mitsubishi Rayon Co., Ltd.) was applied and dried, and a protective layer having a total thickness of 3 μm including the surface layer was provided.

(D) Transfer Recording Test The ink-coated surface of the above (b) ink ribbon was subjected to the above (a)
Using a thin film type line thermal head having a heating resistor density of 8 dots / mm superimposed on the image receiving body prepared from the above, from the color sheet side, a recording line density of 8 lines / mm and an applied power of the thermal head of 0.13 W / dot The recording was performed with an applied pulse width of 10 ms of the thermal head. On the printed portion and the non-printed portion, the protective layer of the above (c) is overlapped,
Using a thin-film type line thermal head also having a heating resistor density of 8 dots / mm from the opposite surface of the protective layer, recording was performed at a recording line density of 8 lines / mm and an applied power of the thermal head of 0.13 W / dot. Was. At that time, the application pulse was performed in three stages of 6 milliseconds, 7 milliseconds, and 8 milliseconds.

(E) Density measurement and storage stability test of recorded matter The printed portion of the blue recorded matter was measured with a densitometer (RD914, manufactured by Macbeth Co., USA) to obtain a reflection density.
With respect to the protective layer, the adhesiveness was visually evaluated, and a test was conducted in which a tape (trade name: Scotch Mending Tape, manufactured by Sumitomo 3M Limited) was attached to the image and peeled off. The results are shown in Table 2.

Examples 2 to 4 Table 1 shows the ratio of polyvinyl acetal resin, polyvinyl chloride resin, silicone resin, carboxylic acid ester and isocyanate.
A test was conducted in the same manner as in Example 1 except that
The results are shown in Table 2. Example 5 Instead of the polyvinyl phenyl acetal resin in Example 1, a polyvinyl butyral resin (trade name: Denka butyral # 5000-A, manufactured by Denki Kagaku Kogyo Co., Ltd.)
The same tests as in Example 1 were carried out except for using, and the results are shown in Table 2.

Example 6 Instead of the polyvinyl phenyl acetal resin in Example 1, a polyvinyl phenyl acetal resin (k = 70, l = 0, m = 29, n =
A test similar to that of Example 1 was performed except that 1) was used, and the results are shown in Table 2. Example 7 As a resin for the adhesive layer in (c) of Example 1, VY was used.
A test was performed in the same manner as in Example 1 except that only HH was used.
The results are shown in Table 2.

Comparative Examples 1-4 The ratios of polyvinyl acetal resin, polyvinyl chloride resin, silicone resin, carboxylic acid ester and isocyanate are shown in Table 1.
The same tests as in Example 1 were performed except for the following, and the results are shown in Table 2.

[0044]

[Table 1]

[0045]

[Table 2] X: At least a part of transfer failure is seen in the protective layer. Δ: The protective layer is transferred, but at least a part is peeled off in a tape test. ：: The transferred protective layer is not peeled off even in the tape test.

[0046]

As described above, the image receiving body for sublimation type thermal transfer recording of the present invention is capable of high density recording while maintaining the releasability from the ink ribbon, the bleeding of the dye on the recorded matter, the fading property and the solvent resistance. And an image receiver having good adhesion to the protective layer can be obtained.

 ──────────────────────────────────────────────────の Continued on the front page F-term (reference) 2H111 AA08 AA27 AA33 AA52 CA03 CA30 4F100 AH02B AH03B AH06B AK07 AK15B AK15C AK15J AK22B AK22C AK22J AK23B AK25C AK52B AL01B AL01C AL05B06 J07 BA02B07 J00

Claims (6)

[Claims] 1. An image receiving member having an image receiving layer provided on a substrate and used for thermal transfer recording, wherein the image receiving layer comprises 30 parts by weight of a polyvinyl acetal resin and 30 parts by weight of a vinyl chloride-vinyl acetate copolymer resin. 100 parts by weight, and further contains at least one compound selected from a carboxylic acid ester and an isocyanate compound, and the total content of the carboxylic acid ester and the isocyanate compound is 100 parts by weight of the polyvinyl acetal resin. An image receiving body characterized in that the amount is 0.5 to 20 parts by weight. 2. An image receiving layer comprising a polyvinyl acetal resin 1
2. The image receiving body according to claim 1, further comprising 0 to 30 parts by weight of silicone resin based on 00 parts by weight. 3. The image receiving body according to claim 1, wherein the polyvinyl acetal-based resin is a resin containing an acetal group having an aromatic ring. 4. The image receiving body according to claim 1, wherein the image receiving layer further contains silicone oil. 5. The image receiving body according to claim 1, wherein the image receiving body is used in a method in which a protective layer is provided on the surface of the image receiving layer after image formation. 6. The image receiving body according to claim 5, wherein at least a side of the protective layer directly in contact with the image receiving layer is at least one selected from a vinyl chloride-vinyl acetate copolymer resin and an acrylic resin.