JPH022077A - Dye transfer material and preparation thereof - Google Patents

Abstract

PURPOSE:To use a dye having high weatherability and low sublimability and to hold high saturated recording density over many times by successively laminating a high concn. dye layer and a dye permeable low concn. layer containing a water-soluble or water-dispersible resin to a substrate to form a color material layer. CONSTITUTION:In a transfer material 1, a high concn. dye layer 9 containing a dye, a dye permeable low concn. layer 10 containing the dye at concn. lower than that of the high concn. layer and containing a water-soluble or water-dispersible resin and a lubricating layer 11 containing a lubricant are successively laminated to a transfer substrate 2 to form a color material layer 3. By performing recording by closely bringing the color material layer 3 of this dye transfer material 1 into contact with the dyeing layer of an image receiving material having dyeability, many-time recording reduced in the lowering of initial recording density becomes possible. Since the lubricating layer 11 is provided, the dye transfer material or image receiving material is selectively heated from the rear thereof in such a state that the running speed of the dye transfer material to a thermal recording head is lower than that of the image receiving material to transfer the dye in the color material layer to the dyeing layer and an image is formed on the image receiving material. Even at the time of many-time recording, the lowering of initial recording density can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dye transfer type thermal recording in which an image is formed by transferring the dye on a dye transfer member to a dye layer on an image receptor. The present invention relates to a dye transfer member for multiple recording using multiple times, and a method for manufacturing the same.

Conventional technology Dye transfer type thermal recording using dyes with high sublimation property is a full-color recording method that can record density gradations for each recorded dot, but it has the drawback of high cost for the transfer body, making it difficult to use the transfer body multiple times. Attempts are being made. As a report on multiple recordings, (1) "Nx mode recording durability of sublimation transfer type thermal recording material"
(Proceedings of the 2nd Non-Impact Printing Technology Symposium in 1985, Plot-104) and (2)
``Study of sublimation film for multiple recording'' (Proceedings of the 1986 National Conference of the Institute of Image Electronics Engineers).

(1) and (2) both relate to multiple recording characteristics using the relative speed method.

For multiple recordings, there is a simple repeat method in which the same area is repeatedly used N times, and a method in which the dye transfer material is supplied to the image receptor at a rate of 1
There are two types: an n-times mode relative speed method in which recording is performed virtually n times at n times.

The relative speed method requires some effort to create smoothness between the dye transfer member and the image receiver, but since the unrecorded portion of the transfer member is always supplied, the actual number of repetitions must be larger than that of the simple repetition method. I can do it.

In (+), spherical spacer particles are interposed between the transfer member and the image receiver, and a recording density of 1.8 is achieved with the number of repetitions n=12. In (2), the transfer body and image receptor are run closely together.

When n=10, a recording density of 1.0 is achieved.

Problems to be Solved by the Invention In order to achieve full-color image recording equivalent to normal recording (one-time recording), it is necessary to perform 1 degree of saturated recording (approximately 1.5 to 1.5 degrees), which is equivalent to 1 degree of saturated recording during normal recording. 8) and that the change in 878 degrees due to the number of repetitions for the same recording energy be small so as not to be influenced by the recording history.

Conventional Example (1) satisfies the above conditions in terms of recording characteristics if a sufficient amount of dye necessary for multiple recordings is ensured.

However, in order to provide lubricity between the dye transfer member and receiver to enable relative speed running, and at the same time provide space to control the amount of transfer through the sublimation process, the usable dyes are limited to dyes with high sublimability. It will be done. In conventional example (2), it is possible to use highly weather-resistant dyes with low sublimation properties through contact diffusion transfer, but even if sufficient amount of dye is secured for multiple recordings, the number of repetitions for the same recording energy increases. As a result, the saturation recording density obtained during multiple recordings has not reached a practical level.

In contrast, a dye transfer material is used which has a coloring material layer on a substrate that contains at least a highly sublimable dye and a binder, and is configured such that the weight concentration of the dye on the layer surface side is lower than on the layer base side. This makes it possible to use the same location on the dye transfer member many times in contact diffusion transfer. However, when a low dye concentration layer containing an oil-soluble resin is laminated by coating with an organic solvent solution, the pre-coated high dye concentration layer dissolves, making it difficult to keep the dye concentration on the surface of the colorant layer low, which was originally expected. Good multi-time recording characteristics could not be obtained.

The present invention solves the above problems, allows the use of highly practical dyes with high weather resistance and low sublimation, reduces the decrease in recording density as the number of recordings increases for the same recording energy, and allows high saturation recording even for a greater number of recordings. It is an object of the present invention to provide a dye transfer member for multiple recordings, which can maintain density and enable full-color recording equivalent to normal one-time recording at lower running costs.

Means for Solving the Problems A dye high concentration layer containing at least a dye, and a dye permeable low concentration layer having a dye concentration lower than the high concentration layer and containing at least a water-soluble resin or a water-dispersible resin, The structure is such that they are sequentially laminated on a base.

Function: When no space is provided between the dye transfer member and the image receiver, the transfer of the dye is dominated by the diffusion phenomenon of the dye between the coloring material layer and the dyeing layer. Therefore, if we focus on the change in dye concentration on the surface of the coloring material layer during the dye consumption process of multiple recordings, we can see that in the coloring material layer formed by the normal method, there is no gradient of dye concentration inside the coloring material layer in the initial state. Sometimes, the dye near the surface is consumed, and the dye concentration on the surface of the coloring material layer decreases to nearly half of the concentration inside the coloring material layer. From the second time onwards, the dye is supplied from inside due to the concentration gradient inside the coloring material layer, so the rate of decrease in the dye concentration on the surface of the coloring material layer becomes very small. Therefore, the change in recording density during multiple recordings when the same recording energy is applied is:
The recording density decreases greatly from the first time to the second time, and the subsequent decrease in recording density is small. Therefore, by first providing a high dye concentration layer on the substrate and then coating a layer with a low weight concentration of the dye with a water-based coating solution containing a water-soluble resin or a water-dispersible resin, it is possible to coat the layer with a high dye concentration that was previously applied. By lowering the dye weight concentration on the surface side of the coloring material layer without dissolving it and creating a concentration gradient inside the coloring material layer, the dye is supplied from inside the coloring material layer from the beginning, and as a result, It is possible to greatly improve the rapid decrease in the initial recording density caused by the rapid decrease in the dye concentration on the surface of the coloring material layer.

Example The present invention will be specifically explained.

A coloring material layer that provides good multi-time recording characteristics, contains at least a highly sublimable dye and a binder, and is configured such that the weight concentration of the dye on the surface side of the layer is lower than on the surrounding substrate side. In existing dye transfer materials, the method of forming a coloring material layer to specifically realize the above-mentioned dye concentration distribution is as follows: (1) A plurality of layers having different dye weight concentrations are sequentially formed on a substrate from the one with the highest concentration. (2) A method of forming a coloring material layer by laminating layers; There is a method of forming layers.

Regarding (2), since it is difficult to stably and precisely obtain the desired dye concentration distribution, it is considered that the method (1) is usually used.

In (1), it is preferable to stack several layers and create a concentration gradient throughout the interior of the coloring material layer, but the easiest two-layer structure to manufacture is a layer with a high dye concentration containing at least a dye, and a layer with a high dye concentration containing at least a dye. Even in a dye transfer body in which a dye-permeable low-density layer whose density is lower than that of the high-density layer is sequentially laminated on a substrate as a coloring material layer, it is possible to greatly improve the initial recording density change during multiple recordings. It is quite possible. In a two-layer configuration, in order to suppress initial recording density changes, the dye-type ffi density of the dye-transmissive low-density layer should be set to 1/1 of the dye weight density of the dye-high density layer.
2. It is more preferable to set it to the following, and the effect is large. The thickness of the dye-permeable low-density layer can be adjusted to the most effective thickness by adjusting the ratio of the dye concentration of the dye-permeable low-density layer to the dye concentration of the dye-high concentration layer. It can be adjusted by making it thicker when the ratio is high and thinner when it is low.
1μm if the dye concentration of the dye permeability low density layer is close to zero
It is preferable to do the following. In addition, in the two-layer structure, the dye-permeable low-density layer can have a protective function for the high-dye concentration layer during long-term storage. Content rate: 50% by weight
This allows a large amount of dye to be efficiently retained on the dye transfer body, and also allows for high dye transfer.
Since the dye is retained at a constant rate, the dye concentration inside the coloring material layer can be maintained high even after many more recordings, so high-density recording with little change in recording density can be achieved even after many more recordings. However, in the method of repeatedly applying coating liquids with the same solvent composition with different pigment concentrations, the coating liquid applied later dissolves the previously formed high pigment concentration layer, and the high concentration of pigment This will easily increase the dye concentration of the dye-permeable low-density layer coated later. For this reason, it was not possible to obtain good multiple recording characteristics.

Therefore, ``a dye high concentration layer containing at least a dye, and a dye permeable low concentration layer in which the dye concentration in the layer is lower than the high concentration layer and containing at least a water-soluble resin or a water-dispersible resin,
When a dye transfer body is formed by sequentially laminating dye transfer materials on a substrate, the above-mentioned problems can be solved because the dye-permeable low-concentration layer is applied as an aqueous coating solution that does not dissolve the dye-high concentration layer.

FIG. 1 shows an example of the configuration. The transfer body 1 is made by sequentially laminating a dye high concentration layer 9 and a dye transmitting low concentration layer 10 on a transfer substrate 2 to form a coloring material layer 3. Further, the image receptor 4 has a dyeing layer 6 provided on an image receiving substrate 5.

In addition, when the running speed of the dye transfer member with respect to the thermal recording head is smaller than the running speed of the image receiver with respect to the thermal recording head, the dye in the color material layer is heated selectively from the back surface of the dye transfer member or the back surface of the image receiver. Even in multiple recordings using a relative speed recording method in which an image is transferred to the dyed layer of the image receptor and formed on the image receptor, it is possible to suppress a decrease in recording density due to an increase in the relative speed ratio n.

The principle of the relative speed recording method is shown in FIG. 2.

The transfer body 1 and the image receptor 4 are pressed against a thermal head 8 by a platen 7 so that the dyed coloring layers are brought into close contact with each other. With respect to the speed V of the image receptor 4 with respect to the thermal head 8, the transfer body 1
runs at v/n (n=1, ・2, fist・). The traveling direction of the transfer body may be the same as or opposite to the traveling direction of the image receptor. However, since the transfer body is heated by a thermal head, the color material layer of the transfer body and the dyed layer of the image receptor tend to collide, and at least one of the color material layer and the dyed layer must have sufficient lubricity.

Therefore, "a high dye concentration layer containing at least a dye and a dye permeable low concentration layer having a dye concentration lower than that of the high concentration layer and containing at least a water-soluble resin or a water-dispersible resin and a lubricant, are formed on a substrate." A dye transfer body that is sequentially laminated to form a color/material layer, and a dye transfer body containing at least a dye with a high dye concentration layer, the dye concentration in the layer being lower than the high concentration layer and containing at least a water-soluble resin or a water-dispersible resin. A dye-transmissive low-density layer containing a dye and a lubricant layer containing at least a lubricant are sequentially laminated on a substrate to form a coloring material layer.''
The N dye transfer material is a dye transfer material provided with lubricity that enables relative speed recording. As a method for forming a specific surface condition of a dye transfer material having lubricity on the surface of the color material layer, (1) After coating and forming a dye high concentration layer, a water-soluble resin or a water-dispersible resin is applied. (2) A method in which a dye-permeable low-density layer is formed with lubricity by applying a water-based coating solution containing a resin and a lubricant, and (2) an appropriate dye concentration distribution is formed in advance by the method described above. There is a method of laminating a lubricant layer containing at least a lubricant on clay.

FIG. 3 shows a configuration example of (2) ((1) is the same as in FIG. 1). The transfer body 1 has a dye layer 3 formed by sequentially laminating a dye high concentration layer 9, a dye permeable low concentration layer 10, and a lubricant layer 11 on a transfer substrate 2.

By using this dye transfer material and performing multiple recordings with the color material layer of the dye transfer material and the dyed layer of the image receptor, which determines the dye dyeing property, being brought into close contact, it is possible to perform multiple recordings with a small decrease of 143 degrees in the initial recording. Recording is possible. In addition, if the coloring material layer of the present dye transfer body contains a lubricant on the surface that imparts sufficient lubricity, the traveling speed of the dye transfer body relative to the thermal recording head is smaller than the traveling speed of the image receptor relative to the thermal recording head. Even in multiple recordings using the relative speed recording method, in which the dye in the color material layer is transferred to the dyed layer by selectively heating the back surface of the dye transfer member or the back surface of the image receptor to form an image on the image receptor. It is possible to perform multiple recordings with a small decrease in initial recording density.

Specific materials used in the present invention will be explained below.

As pigments, disperse pigments, basic dyes, and basic dyes 4-1
There are such things as Guiforma.

The heat source necessary for transfer is not particularly limited, such as a thermal head, an energization method, heat mode heating using a laser, etc. Therefore, various substrates can be used for the dye transfer member and image receiver depending on the purpose. For example, as a substrate for a dye transfer material for a thermal head, ester polymers such as polyethylene terephthalate, polyethylene naphthalate, and polycarbonate, amide polymers such as nylon, cellulose derivatives such as acetylcellulose and cellophane, polyimide, polyamideimide, polyamide, etc. Examples include imide-based polymers such as etherimide, and a heat-resistant layer or a slippery layer is provided on the surface of the substrate that comes into direct contact with the thermal recording head, if necessary. Further, in order to perform current recording and induction heating recording, a film made of the above-mentioned materials or the like is used to impart conductivity.

The binder resin that forms the high dye concentration layer is not particularly limited, but examples include polyester resin, butyral resin, nylon resin, polycarbonate resin, urethane resin, chlorinated polyethylene, chlorinated polypropylene, (meth)acrylic resin, and polystyrene resin. , AS resin, polysulfone resin, polyphenylene oxide, cellulose derivative, etc., which are selected and used in combination depending on the required characteristics.

The high dye concentration layer only needs to contain at least a dye, but may also contain various additives such as a lubricant and a dye dispersant in addition to the binder described above. However, silicone compounds Φ
Care must be taken because if the surface free energy of the dye-rich layer is reduced by adding wax or the like, it will be difficult to apply an aqueous coating liquid with a relatively high surface free energy.

Solvents used in the preparation of ink to form a high dye concentration layer include alcohols such as methanol, ethanol, propatool, butanol, methyl cellosolve,
Cellosolves such as ethyl cellosolve, aromatics such as benzene, toluene, and xylene, esters such as butyl acetate, ketones such as acetone, 2-butanone, and cyclohexanone, nitrogen compounds such as N, N-dimethylformamide, and dichloromethane. , chlorobenzene, chloroform, and other halogenated hydrocarbons. Furthermore, the ink can be applied onto the base material by using a reverse roll coater, gravure coater, rod coater, air doctor coater, etc. (Yuji Harasaki, "Coating Method", published by Yoko Shoten, 1979). .

The coating method for the coating liquid is the same for the dye permeability low 1 degree coral and lubricant layers.

The thickness of the dye-rich layer depends on the dye concentration in the dye-rich layer, the target number of recordings or relative speed ratio, and the amount of dye required on the image receptor to obtain the required maximum recording once. It is preferable to ensure at least the dry coating weight given by the following formula.

Minimum dry blast coating weight (g/m2) = (Target number of records) x
(Required amount of dye g/m2)/(Dye weight concentration) The water, soluble resin, and water-dispersible resin used for the dye permeability low concentration layer include polyvinyl alcohol, poly(meth)acrylic acid (
Metal salts are also allowed), polyacrylamide, water-based urethane resin, water-based acrylic resin, water-based polyester resin, etc. ” Management Development Center Publishing, 1981). however,
For example, with highly saponified polyvinyl alcohol or acrylic acid homopolymers, the dye diffusion rate is low, and if the layer thickness becomes large, sufficient recording sensitivity cannot be obtained. It has a large impact and is not practical.

Examples of water-soluble resins or water-dispersible resins that provide an appropriate dye diffusion rate include polyvinyl alcohol with a degree of saponification of 30 to 90%, water-soluble (or water-dispersible) polyester resins, and water-soluble (or water-dispersible) resins. ) polyurethane resin, water-soluble (or water-dispersible) acrylic resin, etc.

Furthermore, when a high dye concentration layer, a low dye permeability layer, and a lubricant layer are sequentially laminated, if the dye permeability low concentration layer is attacked by the lubricant layer coating liquid, the dye concentration on the surface of the coloring material layer cannot be adjusted to an appropriate level. The density becomes higher than the density, and the recording characteristics deteriorate many times. In such a case, the resin of the dye-permeable low concentration layer must have organic solvent resistance. Such water-soluble or water-dispersible resins have a saponification degree of 7.
Examples include 0 to 90% polyvinyl alcohol, water-soluble (or water-dispersible) polyurethane resin, and the like.

In addition, when the dye-permeable low concentration layer contains a lubricant, the lubricant that can be used is not particularly limited as long as it can be dissolved or emulsified in the water-based coating solution, and the lubricant used in the lubricant layer described later can be used. Can be mentioned.

The solvents used for preparing the ink to form the dye-permeable low concentration layer include alcohols, ketones,
Cellosolves and the like may be added. It goes without saying that an appropriate emulsifier may be added to emulsify the lubricant, and a hidden surfactant may be added to reduce the surface tension of the coating liquid.

The thickness of the dye-permeable low-density layer depends on the dye diffusion rate and dye concentration of the water-soluble or water-dispersible resin used, the energy required for the target recording, the number of recordings, or the relative velocity ratio n in relative velocity recording. However, when the number of recordings or n is about several tens, the thickness is 0.1
Approximately 1 μm or so is appropriate.

The lubricant layer must contain at least a lubricant. Examples of the lubricant contained in the lubricant layer and dye-permeable low concentration layer include petroleum-based lubricants such as liquid paraffin, synthetic lubricants such as silicone oil and fluorosilicone oil, and various modified silicones. Oils (epoxy-modified 1. Amine-modified, alkyl-modified, polyether-modified, etc.), silicone-based lubricating substances such as copolymers of silicone and Yoki compounds such as polyoxyalkylene glycol, various fluorine-based surfactants such as fluoroalkyl compounds, etc. agents, fluorine-based lubricating substances such as trifluorochloroethylene low polymers, waxes such as paraffin wax and polyethylene wax, higher aliphatic alcohols, higher alcohols, higher fatty acid amides, higher fatty acid esters, higher fatty acid salts, etc. . Among these, liquid lubricants are not preferred because the dye may be dissolved in the liquid lubricant and transferred to the image receptor even when heating for recording is not performed.

Preferably, a wax with a melting point of 60°C or higher (more preferably paraffin wax or microwax in terms of solubility in various solvents), fatty acid amide, fatty acid,
Examples include a reaction product of reactive silicone oil (preferably a reaction product of epoxy-modified silicone oil and amino-modified silicone oil in terms of reacting without a catalyst). These can be selected and used in combination as necessary.

Furthermore, the lubricant layer may contain a binder resin if necessary, and in addition to various binder resins that can be used in the dye-rich layer, water-soluble resins, water-dispersible resins, etc. can be used. . However, it is preferable to use a dye that does not have a low diffusion rate so as not to deteriorate the recording properties of the dye transfer member.

An image receptor usually consists of an image-receiving substrate and a dyeing layer.

As image-receiving substrates, various transparent films such as polyester films are generally used, and white materials such as synthetic paper mainly made of polyester, polypropylene, etc., coated paper, plain paper, etc. are used depending on the purpose.

The dyeable substances used in the dyeing layer include polyester, polyamide, acrylic resin, acetate resin, various cellulose derivatives, starch, polyvinyl alcohol, etc.
Further, as the cured resin, there are products cured by heat, light, electron beam, etc. such as acrylic acid, acrylic ester, polyether, polyurethane, polyamide, acetate, etc., and these may be selected and used in combination as necessary.

The present invention will be explained in detail below using specific examples.

Aromatic polyamide film (
6 μm thick) with a heat-resistant slipping layer provided thereon was commonly used.

The base of the image receptor is PET white synthetic paper, and on top of this is an ultraviolet curing resin (Showa Kobunshi Co., Ltd. SP5003).
) Log, sensitizer (Nippon Ciba Geigy Co., Ltd. Irgacure 184) 0°1 gs amide-modified silicone,
After applying a coating solution of 0.05 g of Illu (Shin-Etsu Chemical Co., Ltd. KF3935) dissolved in 10 g of toluene using a wire bar, it was dried with hot air, and then cured by irradiating ultraviolet rays for 1 minute with a 1 kW high-pressure mercury lamp to dye it. A layer was formed to form an image receptor. The dye used has the following structural formula.

A thermal head is used as the recording means, and the recording period is the recording period.16. 7-ms/1 recording pulse width MAX 4. 0 ms resolution
6 1 /mm recording energy 6
J/cm2 (variable) Transfer body running speed 1. 0
mm/s *Image receptor traveling speed 10. 0mm
/s (*Only in the case of relative velocity recording, simple repeat recording is 10.0 mm/s).

<Example 1> 2 g of the dye having the above structural formula and 2 g of butyral resin (S-LEC BX-1 manufactured by Tsukisui Kagaku Co., Ltd.) as a binder resin were placed on the substrate.
An ink prepared by dissolving this in a mixed solvent of 21 g of toluene and 9 g of MEK was coated with a wire bar so that the dry coating weight was 3 g/I and dried to form a high dye concentration layer. and 1 g of water-soluble saturated polyester resin (Nippon Gosei Kagaku Co., Ltd. Polyester-WR901), 0.1 g of polyvinyl alcohol (Nippon Gosei Kagaku Co., Ltd. Gohsenol KH-17).
A coating solution prepared by dissolving 1.0 g in 20 g of water was applied using a wire bar to a dry coating weight of 0.2 g/m2, and dried to form a dye-permeable low concentration layer. In addition, 1g1 of butyral resin (S-LEC BMS, Tsukusui Kagaku Co., Ltd.) melting point 69°
C paraffin wax (Nippon Seiro Co., Ltd. product number 155)
0.05g1 A coating solution prepared by dissolving 0.05g of oleic acid amide in 15g of toluene was applied using a wire bar so that the dry coating weight was 0.2g/m2, and dried to form a lubricant layer, which was then used as a coloring material layer. A dye transfer body was obtained.

<Example 2> After providing a high dye concentration layer in the same manner as in Example 1, 45%
A coating solution prepared by dissolving 1 g of saponified polyvinyl alcohol in a mixed solvent of 7.5 g of water and 7.5 g of ethanol was applied to give a dry coating weight of 0.2 g/m 2 and dried to obtain a dye transfer material.

<Example 3> After forming a high dye concentration layer in the same manner as in Example 1, a water-dispersed urethane ionomer resin solution (Dainippon Ink Co., Ltd. Hytran AP40, solid content 22%), 5 g 1 polyvinyl alcohol (Nippon Gosei Chemical Co., Ltd.) GOHSENOL K Co., Ltd.
A coating solution prepared by diluting and dissolving 0.02 g of H-17) in 12.5 g of water was applied to a dry coating weight of 0.2 g and dried to form a dye-permeable low concentration layer. In addition, butyral resin (BMS) 1g1 Amino-modified silicone oil (Shin-Etsu Chemical Co., Ltd. KF 393) O-05gz
A coating solution in which 0.05 g of 393) was dissolved in 15 g of toluene was applied in the same manner and dried to obtain a dye transfer material.

<Example 4> After providing a dye high 1 degree layer in the same manner as in Example 1, 45%
1g of saponified polyvinyl alcohol, 0.05g of paraffin wax with a melting point of 69°C, 0.05g of oleic acid amide, 0.002g of surfactant (Rheodol 430, Kao Corporation), 7.5g of water, 7.5g of ethanol.
The dry coating weight of the coating liquid dissolved and emulsified in g of mixed solvent is 0.
．． It was coated at a concentration of 2 g/m 2 and dried to obtain a dye transfer material.

Comparative Example 1> In the same manner as in Example 1, a high dye concentration 9 degree layer was provided to prepare a dye transfer body.

Comparative Example 2> After providing a high dye concentration layer in the same manner as in Example 1, butyral resin (BX-1) Igl, paraffin wax (same) with a melting point of 69°C 0.05 g 1 oleic acid amide 0
．． A coating solution prepared by dissolving 0.5 g of toluene in 21 g of toluene and 9 g of MEK was coated so that the dry coating weight was 0.8 g, and dried to form a dye-permeable low-density layer to prepare a dye transfer body. However, in this case, a large amount of coating liquid containing dissolved dye was attached to the wire bar after the dye-permeable low concentration layer was applied.

Comparative Example 3 After providing a high dye concentration layer in the same manner as in Example 1, polyvinyl alcohol (Tarare Poval T17) Ig
The dry coating weight is 0.1g by dissolving the coating liquid in 20g of water.
/m2 and dried to form a dye-permeable low concentration layer. In addition, butyral resin (BMS) Ig,
Amino-modified silicone oil (Shin-Etsu Chemical Co., Ltd. KF3)
93) 0.05g1 0.05g of epoxy-modified silicone oil (Shin-Etsu Chemical Co., Ltd. X-22-393) was dissolved in 15g of toluene, and a coating liquid was applied in the same manner and dried to make a dye transfer material. The dye transfer material was subjected to recording under the above conditions to examine whether relative speed recording was possible. The results were as shown in Table 1 and Figure 4.

In FIG. 4, the recording density change at the same recording energy in multiple recordings using the simple repetition method=Nth recording density/first recording degree (%) was measured.

Table 1 *Recording energy indicates the energy at which the recording density becomes approximately 1.8. The unit is J/crn2 Effects of the Invention According to the present invention, the rapid decrease in dye density on the surface of the coloring material layer due to the increase in the number of repetitions in multiple recordings is suppressed, and the decrease in recording density is greatly improved. Furthermore, a dye transfer material imparted with lubricity by containing a lubricant can also perform relative velocity recording.

As a result, it is possible to use highly practical dyes with high weather resistance and low sublimation, and the decrease in recording density due to the increase in the number of recordings for the same recording energy is small, making it possible to maintain high saturated recording density for many more recordings. It is possible to obtain a dye transfer material for multi-time recording that enables full-color recording equivalent to normal one-time recording at lower running costs.

[Brief explanation of the drawing]

1 and 3 are cross-sectional views of a dye transfer body in an embodiment of the present invention, FIG. 2 is a principle diagram of multiple recording using the relative speed recording method, and FIG. FIG. 3 is a diagram showing the recording density characteristics. DESCRIPTION OF SYMBOLS 1...Transfer body, 3...Color material layer, 4...Image receptor, 6...Dyeing layer, 9...Dye high concentration layer, 10
...Dye-permeable low concentration layer, 11...Lubricant layer. Name of agent Patent attorney Toshio Nakao (1 person) Figure 1 Figure 3 Figure 4 Figure 1 Transcript Figure 2 Number of recordings N

Claims (5)

[Claims] (1) A dye high concentration layer containing at least a dye and a dye permeable low concentration layer having a dye concentration lower than that of the high concentration layer and containing at least a water-soluble resin or a water-dispersible resin are sequentially formed on a substrate. A dye transfer material that is laminated to form a color material layer. (2) The dye transfer member according to claim 1, wherein the dye-permeable low-density layer further contains a lubricant. (3) A lubricant layer containing at least a lubricant is further laminated on the dye permeable low concentration layer to form a coloring material layer.
Dye transfer material described in Section 1. (4) The dye transfer member according to claim 1, wherein the water-soluble resin or water-dispersible resin of the low dye concentration layer is partially saponified polyvinyl alcohol, water-soluble saturated polyester resin, or water-dispersible polyurethane resin. (5) an organic solvent-based coating liquid containing at least a pigment, and a water-based coating containing at least a water-soluble resin or a water-dispersible resin, the dye concentration of which is lower in the solid content than the pigment concentration in the solid content of the organic solvent-based coating liquid; 1. A method for producing a dye transfer material, which comprises sequentially layering a dye transfer material on a substrate to form a color material layer consisting of at least a high dye concentration layer and a low dye permeability layer.