JP2016172392A - Intermediate transfer medium, method for manufacturing intermediate transfer medium, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate transfer medium, a method for manufacturing an intermediate transfer medium, and a recording medium capable of obtaining high image quality and reliably holding a record. An intermediate transfer medium of an embodiment is directly or indirectly laminated on a transfer base material, and is laminated on a water-absorbent layer containing a modified polyalkylene oxide as a water-absorbent resin and a water-absorbent layer. The adhesive layer contains a thermoplastic resin for adhering to a recording medium made of resin or paper. [Selection diagram] Fig. 1

Description

  Embodiments described herein relate generally to an intermediate transfer medium, an intermediate transfer medium manufacturing method, and a recording medium.

  Personal authentication media (personal authentication cards) such as ID cards, employee ID cards, and ID cards have face images (photo images) and description information (character images) printed on the surface thereof. Many personal authentication media are covered with a transparent protective layer in order to protect the entire surface of the personal authentication medium from damage and deterioration. The protective layer protects the personal authentication medium by transferring (adhering) an intermediate transfer medium in which the protective layer is formed in a ribbon shape onto the personal authentication medium.

There are roughly two methods for forming the protective layer by this transfer.
The first method is a method in which a protective layer is transferred onto a personal authentication medium and then cured by ultraviolet (UV), heat or electron beam.

The second method is a method of transferring an already cured protective layer onto a personal authentication medium.
And by these methods, the surface protection is realized for cards which are required to have high durability such as the current personal authentication card.

Japanese Patent No. 4452004 Japanese Patent No. 3271931 JP 2009-274290 A JP 2014-058121 A

By the way, conventionally, when printing on a fibrous recording medium such as paper by an ink jet printer, there are the following problems.
(1) Ink bleeds along the fiber and high image quality cannot be obtained.
(2) If water or chemicals adheres after printing, ink dyes or pigments flow and recording cannot be maintained.

  The present invention has been made in view of the above, and it is an object of the present invention to provide an intermediate transfer medium, a method for manufacturing the intermediate transfer medium, and a recording medium that can obtain high image quality and can reliably hold recording. It is said.

The intermediate transfer medium of the embodiment is an intermediate transfer medium that is thermally transferred to a recording medium.
The intermediate transfer medium is laminated directly or indirectly on the transfer substrate, the water absorbing layer containing the modified polyalkylene oxide as the water absorbing resin, and laminated on the water absorbing layer. And an adhesive layer containing a thermoplastic resin for adhering to the manufactured recording medium.

FIG. 1 is a cross-sectional view showing a configuration of an intermediate transfer medium for ink jet recording (hereinafter simply referred to as an intermediate transfer medium) according to the first embodiment. FIG. 2 is a basic flowchart of the intermediate transfer medium manufacturing process. FIG. 3 is a cross-sectional view of the recording medium of the first embodiment. FIG. 4 is an explanatory diagram of the transfer process of the intermediate transfer medium. FIG. 5 is a cross-sectional view of the intermediate transfer medium according to the second embodiment. FIG. 6 is a schematic configuration diagram of the intermediate transfer medium manufacturing apparatus. FIG. 7 is an explanatory diagram of laser recording on a recording medium.

Hereinafter, embodiments will be described in detail with reference to the drawings.
[1] First Embodiment FIG. 1 is a cross-sectional view showing a configuration of an intermediate transfer medium for ink jet recording (hereinafter simply referred to as an intermediate transfer medium) according to a first embodiment.
The intermediate transfer medium 10 of the first embodiment is the one with the simplest configuration, and is an embodiment in which the transfer substrate 11 is used as it is as a protective film (protective layer).

  As shown in FIG. 1, the intermediate transfer medium 10 includes a transfer substrate 11, a water absorbing layer 12, and an adhesive layer 13, and the water absorbing layer 12 and the adhesive layer 13 are provided on one surface of the transfer substrate 11. Are stacked in this order.

  The transfer substrate 11 is composed of various plastic films such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, cellulose, polypropylene, polyethylene, polystyrene, polyvinyl chloride, and the like.

  The transfer substrate 11 has a thickness in the range of 1 to 200 μm, for example. In addition, the transfer substrate 11 is curled by heat if the transfer substrate 11 is too thin, and the point that a large amount of heat is required if the transfer substrate 11 is too thick. And it is good also as a range of 5-50 micrometers.

  The water absorption layer 12 is configured using a modified polyalkylene oxide or a mixture containing a modified polyalkylene oxide as a main component. Moreover, the water absorption layer 12 shall be the range whose thickness is 1 micrometer-1000 micrometers, for example. This is because if the thickness is less than 1 μm, sufficient water absorption cannot be obtained, and if it exceeds 1000 μm, the water-absorbing layer 12 flows at the time of transfer, resulting in deterioration in image quality.

  The adhesive layer 13 uses a mixed material containing a hydrophilic thermoplastic resin and a thermoplastic resin, so that adhesiveness is exhibited by heating, and a transfer medium, particularly a resin (plastic) material including polycarbonate, Japanese paper, It can firmly adhere to vegetable fiber materials such as paper.

As a result, the printing surface can be an adhesive surface, and by providing a protective film on the surface opposite to the printing surface, it is possible to dramatically improve the robustness of the recorded matter.
As shown in FIG. 1, when the water absorption layer 12 and the adhesive layer 13 are laminated directly on the transfer base material 11, as the transfer base material 11, for example, UV curable resin, polyester resin (for example, polyethylene terephthalate) ) And the like, and a resin having heat resistance sufficient to withstand thermal transfer, the transfer base material 11 can have a function as an overcoat material, and the recording medium (recorded material) after thermal transfer can be provided. Robustness can be achieved.

  Further, the adhesive layer 13 does not contain a plasticizer, and the glass transition point Tg is a temperature at which the intermediate transfer medium 10 is heated and thermally transferred to a recording medium described later (the intermediate transfer medium 10 is a recording medium). (Effective thermal transfer temperature at the time of thermal transfer to acrylate) or lower acrylate copolymer. Thereby, it is possible to prevent the image formed by the sublimation thermal transfer method from being attacked by the plasticizer contained in the adhesive layer 13.

  In addition, the glass transition point Tg of the acrylate copolymer constituting the adhesive layer 13 is equal to or lower than the thermal transfer temperature when the intermediate transfer medium 10 is heated and thermally transferred to a recording medium described later (for example, theoretical glass transition point Tg = 36). Since it becomes easy to maintain the flexibility of the adhesive layer 13, it is possible to prevent insufficient adhesive force.

In the present embodiment, for example, when a thermoplastic resin such as polyester resin is used as the recording medium, the adhesive layer 13 has an upper limit temperature at which the intermediate transfer medium 10 can be thermally transferred without melting the recording medium (which constitutes the recording medium). It is constituted by an acrylate copolymer having a glass transition point Tg, for example, a glass transition point of 80 ° C. or less of a polyester resin.

  In the present embodiment, the adhesive layer 13 is a glass having a temperature equal to or lower than the thermal transfer temperature when the intermediate transfer medium 10 is thermally transferred to a recording medium by heating the intermediate transfer medium 10 at a temperature of about 100 ° C. for 2 to 3 seconds. It is comprised by the acrylic ester copolymer which does not contain the plasticizer which has transition point Tg. For example, as the acrylic ester copolymer, a polyacrylic ester copolymer having a theoretical glass transition temperature of 36 ° C. or lower is used.

  In the present embodiment, if the thickness of the adhesive layer 13 is less than 0.5 μm, sufficient adhesion tends to be impossible, and if it exceeds 10 μm, the winding diameter of the intermediate transfer medium 10 increases and costs increase. Although the thickness is 5 to 10 μm, it can be appropriately set according to the purpose.

Next, a method for manufacturing the intermediate transfer medium will be described.
FIG. 2 is a basic flowchart of the intermediate transfer medium manufacturing process.
The four basic steps in the intermediate transfer medium manufacturing process are a step of applying a modified polyalkylene oxide solution or a mixture solution containing a modified polyalkylene oxide as a resin solution for the water absorbing layer 12 (step S11), and the applied water absorbing layer 12 A step (step S12) for drying the resin solution for coating, a step (step S13) for applying a resin solution for the adhesive layer 13 containing a solvent for dissolving the modified polyalkylene oxide on the water absorbing layer 12, and a step for applying the applied adhesive layer 13 This is a step of drying the resin liquid (step S14).

  Hereinafter, the production of the intermediate transfer medium will be described in detail based on this basic production process. In addition, the method of application | coating or drying is not limited to the method shown below, As long as the basic 4 process is satisfy | filled, it can select suitably.

  First, the resin liquid for the water absorption layer 12 and the resin liquid for the adhesive layer 13 are prepared with a predetermined composition. More specifically, the modified polyalkylene oxide solution is prepared by dissolving the modified polyalkylene oxide in alcohol or a mixed solvent of alcohol and water.

Then, using the polyethylene terephthalate film as the transfer base material 11, a resin solution for the water absorption layer 12 is applied onto the transfer base material 11 using a predetermined coating device (for example, a gravure coater) (step S 11).
Next, it is dried at a predetermined temperature (for example, 110 ° C.) for a predetermined time (for example, 5 minutes) (step S12).
Subsequently, after drying and returning to room temperature, a resin solution for the adhesive layer 13 containing isopropyl alcohol at a predetermined concentration (for example, 20%) as a component for dissolving the modified polyalkylene oxide is applied on the water absorbing layer 12 (step). S13). Further, drying is performed at a predetermined temperature (for example, 110 ° C.) for a predetermined time (for example, 5 minutes) (step S14).

Next, the recording medium of the first embodiment will be described.
FIG. 3 is a cross-sectional view of the recording medium of the first embodiment.
As shown in FIG. 3, the recording medium 20 has an image formed by at least a heat melting type thermal transfer method and a sublimation type thermal transfer method, such as personal authentication media such as ID cards and IC built-in cards, securities, stock certificates, and vouchers. It is formed.
In the first embodiment, the recording medium 20 includes a card substrate 21 and an image receiving layer 22 as shown in FIG. The card substrate 21 is a plastic or paper support.

The image receiving layer 22 includes images such as a first image G1 such as a photographic image by a sublimation type thermal transfer system, a second image G2 such as a character image by a thermal melting type thermal transfer system, and a third image G3 by an ultraviolet curable ink. It is formed.
Further, an ultraviolet cut layer 23 is formed so as to cover the first image G1.

  Specifically, a thermoplastic resin such as a vinyl chloride resin, a polyester resin, a phenoxy resin, a polyvinyl butyral resin, or a polyacetal resin is used for the image receiving layer 22. Further, the image receiving layer 22 may be obtained by adding an isocyanate compound or the like to a thermoplastic resin such as a vinyl chloride resin, a polyester resin, a phenoxy resin, a polyvinyl butyral resin, or a polyacetal resin. Further, the image receiving layer 22 may be made of a thermoplastic resin such as vinyl chloride resin, polyester resin, phenoxy resin, polyvinyl butyral resin, polyacetal resin and the like to which a release agent such as silicone is added.

FIG. 4 is an explanatory diagram of the transfer process of the intermediate transfer medium.
As shown in FIG. 4, the process of transferring (adhering) the intermediate transfer medium 10 to the recording medium 20 on which the image has been formed includes a first image G1 based on a sublimation type thermal transfer system on the image receiving layer 22, a thermal melting type thermal transfer system. The intermediate transfer medium 10 is formed by a lifter (not shown) on the recording medium 20 on which the second image G2 and the third image G3 are formed by the ultraviolet curable ink and the ultraviolet cut layer 23 is further formed on the first image G1. Place it in close contact.

Then, the intermediate transfer medium 10 and the recording medium 20 are conveyed by a heat roller (heating roller) HR while heating / pressing.
As a result, the adhesive layer 13 of the intermediate transfer medium 10 is adhered to the image receiving layer 22 of the recording medium 20, so that the protective film layer is formed on the image receiving layer 22 of the recording medium 20 via the adhesive layer 13 and the water absorbing layer 12. As a result, the recording medium 20 to which the transfer substrate 11 is transferred (adhered) is discharged from the recording medium manufacturing apparatus.

  As described above, according to the intermediate transfer medium and the recording medium of the first embodiment, the burden on the recording medium and the device for performing the thermal transfer is reduced, energy is saved, consumables are reduced, storability is good, and convenience is high. Intermediate transfer medium, a method for producing the intermediate transfer medium, and a recording medium can be provided.

[2] Second Embodiment The intermediate transfer medium of the second embodiment is different from the intermediate transfer medium of the first embodiment in that a water absorption layer and an adhesive layer are laminated on a transfer substrate via a functional layer. It is.
FIG. 5 is a cross-sectional view of the intermediate transfer medium according to the second embodiment.
As shown in FIG. 5, in the intermediate transfer medium 10 </ b> A of the second embodiment, a water absorbing layer 12 and an adhesive layer 13 are laminated on one surface of a transfer substrate 11 via a release layer 14 and a functional layer 15. .
In the above configuration, the water absorption layer 12 and the adhesive layer 13 are the same as those in the first embodiment, and thus the detailed description is cited.
The release layer 14 is integrated with the transfer base material 11 and is provided to release the transfer base material 11 from the recording medium 20 side after the transfer of the intermediate transfer medium 10A.
The functional layer 15 is a layer for imparting various functions to the recording medium 20 after transfer of the intermediate transfer medium 10A. In the example of FIG. 5, a protective layer 15A, an optical layer 15B, and a primer layer 15C are provided. ing. In addition, the structure of the functional layer 15 is not limited only to the structure of an Example, It can change as needed.

The water-absorbing layer 12 that enables these uses modified polyalkylene oxide, and the adhesive layer 13 uses polyester, polyolefin, polyvinyl acetate, vinyl acetate malate, and a mixture containing at least one of these. By using these resins, the water-based ink is dried within 0.42 seconds per pl, and the diameter (D [μm]) of the dot formed with the water-based ink is determined by the ink volume (V [pl]). ) And can be controlled to be approximately equal to or less than the value obtained by the following equation. The term “drying” as used herein means that, unless otherwise specified, the ink is transferred to the other medium when another medium such as copy paper, aluminum foil, or SUS board is pressed against the printing portion with a load of 70 g / cm ^2. Say nothing.

  In the above formula, the value of D is such that when printed with 3 pl of ink, the image point is about 25 μm, and 6 pl is about 42 μm. As described above, the intermediate transfer medium 10 according to the present invention has both heat transfer properties, ink quick drying properties, and image receiving properties for controlling image points.

Next, a description will be given of the best configuration for producing the intermediate transfer medium 10 having the ink quick drying property, the image receiving property, and the thermal transfer property as described above.
As the best example of the intermediate transfer medium 10, an intermediate transfer medium having ink quick drying properties, image receiving properties, and thermal transfer properties can be realized by making the following materials and blending ratios. In addition, the display of the compounding ratio shown in an Example is a mass percentage unless there is particular notice.

Next, an example of an intermediate transfer medium manufacturing apparatus will be described.
FIG. 6 is a schematic configuration diagram of the intermediate transfer medium manufacturing apparatus.
The intermediate transfer medium manufacturing apparatus 50 sets a base film set on the unwinding roller 51 or a film in which the functional layer 15 is applied to the base, and applies a resin liquid for the water absorption layer with the first gravure bar 52a ( Step S11: See FIG.
Next, the toner is transported to the first drying furnace 54a through the transport rollers 53a and 53b, and the water absorption layer 12 is dried in the first drying furnace 54a (step S12).
The laminated film on which the water absorption layer 12 dried in the first drying furnace 54a is laminated passes through the conveying rollers 53c, 53d, and 53e and is guided to the second gravure bar 52b.
The second gravure bar 52b applies a resin solution for an adhesive layer containing isopropyl alcohol, which is a solvent for dissolving the modified polyalkylene oxide serving as the water absorption layer (step S13).
Further, the laminated film coated with the resin liquid for the adhesive layer passes on the transport rollers 53f and 53g, is transported to the second drying furnace 54b, and the adhesive layer 13 is dried by the second drying furnace 54b (step S14). In this case, when preparing the resin liquid for the water absorbing layer, drying is performed at a drying temperature higher than the temperature at which the modified polyalkylene oxide is dissolved in a hot water bath.

Thereafter, the film passes on the conveying roller 53h, and all the layers are laminated on the winding core set on the winding roller 55, and the film configured as the intermediate transfer medium 10A is wound.
As described above, according to the intermediate transfer medium manufacturing apparatus and the intermediate transfer medium manufacturing method shown in the second embodiment, the intermediate transfer medium 10A can be mass-produced.
As another method for producing the intermediate medium according to the second embodiment, in the method for producing the intermediate transfer medium according to the second embodiment, the functional layer 15 is laminated on the base material, and then the water absorbing layer 12 and the adhesive layer 13 are functioned. Laminate on layer 15.
As the functional layer 15, a release layer, a protective layer, and an optical layer are laminated, and the components of each layer are polyvinyl alcohol, UV curable resin, acrylic resin, polyvinyl acetate, polyurethane, polyester, polyamide, etc., in any combination as necessary And as a filler, silica, alumina, calcium carbonate, sodium hydrogen carbonate, etc. can be used in combination with one or more kinds and blended with the resins in an arbitrary ratio.
Furthermore, by providing a primer layer having high adhesion on both the optical layer and the water absorbing layer as the functional layer 15, it becomes possible to more firmly integrate the laminated intermediate transfer medium.

  Next, examples will be described.

First, Example 1 will be described.
In Example 1, resin solutions mixed at the following material blending ratios were prepared as the water absorbing layer 12 and the adhesive layer 13, respectively.
(1) Resin solution for water absorption layer 12-Modified polyalkylene oxide 10%
・ Ethanol 72%
・ Ion exchange water 18%
(2) Resin liquid for adhesive layer 13
・ Modified polyester resin dispersion 8%
・ Polyoxyalkylene lauryl ether 0.1%
・ Cationic vinyl compound copolymer 1%
・ Polyester resin 6%
・ Isopropyl alcohol 20%
・ Ion exchange water 64.9%

First, when forming the water absorption layer 12, a modified polyalkylene oxide is mixed in a mixed solvent obtained by mixing ethanol and ion-exchanged water.
Subsequently, the whole mixed solution was bathed at about 80 ° C. (temperature at which the modified polyalkylene oxide was dissolved), and the modified polyalkylene oxide was dissolved in the mixed solvent.

  Next, using a coating apparatus such as a gravure coater or bar coater, it is uniformly applied to a 25 μm polyethylene terephthalate film substrate as the transfer substrate 11 and dried in an oven at 100 ° C. for 10 minutes to a thickness of about 60 μm (of which An intermediate transfer medium having a transfer substrate 11) of 25 μm was obtained.

  Although there is no restriction | limiting in particular regarding the thickness of the intermediate transfer medium after drying, As for the thickness of the water absorption layer 12, 1-1000 micrometers is preferable. This is because if the thickness of the water absorption layer 12 is 1 μm or less, sufficient quick drying properties cannot be obtained. In addition, if the thickness of the water absorbing layer 12 is 1000 μm or more, the water absorbing layer 12 will flow due to the thermoplastic nature of the modified polyalkylene oxide during transfer, which will disturb the image recorded by the ink jet.

When the thickness of the water absorbing layer 12 is 1 to 1000 μm and solid printing is performed on the intermediate transfer medium of the first embodiment with an ink amount of 1.3 ml on an area of 1 cm × 1 cm, after 10 seconds, 70 g / cm ^2. It was found that the ink was not transferred to the copy paper (made by Fuji Xerox) even when the load was applied.

  Further, when a dot was formed with 6 pl of ink, the dot was 42 ± 2 μm. Further, it was found that the roundness of the formed dot was 2 μm, and it was possible to stably form a dot close to a perfect circle by mixing the above materials with the above blending.

  Furthermore, it was possible to adhere to the polycarbonate and the paper medium by thermocompression bonding at 100 ° C. or higher, more preferably 150 ° C. or higher and 180 ° C. or lower, with the printing surface as the adhesive surface. In addition, although the polyethylene terephthalate film was used as the transfer base material 11, the present invention is not limited to this, and any film can be used as long as it is a film that transmits light of at least 300 to 900 nm.

Next, Example 2 will be described.
As shown in FIG. 2, the release layer 14 and the functional layer 15 laminated on the substrate 11 are laminated, and further, the water absorption layer 12 and the adhesive layer 13 formed with the material composition ratio shown in Example 1 are laminated. Thus, it is possible to improve the convenience of transfer and to add functions that cannot be realized simply by thermally transferring a recorded material to another medium.

Here, as the functional layer 15, for example, a protective layer 15A, an optical layer 15B, and a primer layer 15C are formed.
Therefore, by laminating the release layer 14, the protective layer 15A, the optical layer 15B, the primer layer 15C, the water absorbing layer 12, and the adhesive layer 13 in this order on the transfer substrate 11, it is selectively placed at a specific location on the intermediate transfer medium. It is possible to peel the release layer 12 and the transfer substrate 11 from the protective layer 15A after only a part is adhered to the recording medium 20 as a transfer medium by applying heat.

By adopting such a configuration, when the intermediate transfer medium is manufactured in a roll shape, printing and transfer can be continuously performed.
Furthermore, the recorded material is coated with the protective layer 15A, so that the fastness of the recording medium (recorded material) after adhesion can be maintained.

  As the optical layer 15B, for example, by stacking an optical layer 15B capable of recording a hologram between the protective layer 13 and the water absorption layer 16, information by printing and information by the hologram can be recorded together. For this reason, it is possible to create a recording medium (recorded material) that cannot be easily copied.

  Further, as the primer layer 15C, a material having high adhesiveness with both the optical layer 15B and the water absorbing layer 12 is used to help the intermediate transfer medium 10A to be integrated even when recording or transferring. is there.

  In this case, since the transfer substrate 11 is peeled off after the transfer, it does not necessarily have to have light transmittance. And the transfer base material 11 should just hold | maintain until it heat-transfers the contact bonding layer 13, the water absorption layer 12, the primer layer 15C, the optical layer 15B, and the protective layer 15A.

  The third example is formed on the release layer 12, the protective layer 13, the optical layer 15, and the primer layer 15 </ b> C laminated on the transfer substrate 11 with the material composition ratios shown in Example 1 and Example 2. In the intermediate transfer medium on which the water absorbing layer 16 and the adhesive layer 17 are laminated, all the layers except the base material 11 have a high transmittance of ultraviolet light to near infrared light (300 nm to 2000 nm) (for example, a transmittance of 80 to 80 nm). 90%).

FIG. 7 is an explanatory diagram of laser recording on a recording medium.
According to the third embodiment, after transferring the intermediate transfer medium 10A to a recording medium (transfer medium) 20 (for example, polycarbonate, polyvinyl chloride, polyethylene terephthalate, Japanese paper, paper, etc.), only the substrate 11 is transferred. By peeling and irradiating a laser beam 31 in an arbitrary pattern from the release layer 14 toward the adhesive layer 17, recording by the laser 30 onto the recording medium 20 after the transfer of the intermediate transfer medium 10A becomes possible. ing.

  At this time, ink-jet recording on the intermediate transfer medium may be performed before transfer to another medium, and the presence / absence of recording, location, type of ink used for recording, ink head arrangement, head transport method, or head by line head Selection of a type that does not carry is possible.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment is included in the scope and gist of the invention, and is also included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 10 Intermediate transfer medium 11 Transfer base material 12 Water absorbing layer 13 Adhesive layer 14 Release layer 15 Functional layer 15A Protective layer 15B Optical layer 15C Primer layer 20 Recording medium 21 Card base material 22 Image receiving layer 23 Ultraviolet cut layer

Claims (9)

A transfer substrate;
A water-absorbing layer that is directly or indirectly laminated on the transfer substrate and contains a modified polyalkylene oxide as a water-absorbing resin;
An adhesive layer that is laminated on the water-absorbing layer and contains a thermoplastic resin for adhering to a recording medium made of resin or paper;
With
An intermediate transfer medium that is thermally transferred to the recording medium. The water absorption layer has a thickness of 1 μm to 1000 μm.
The intermediate transfer medium according to claim 1. The water absorption layer and the adhesive layer have a high transmittance of 80% or more for ultraviolet light to near infrared light,
The intermediate transfer medium according to claim 1 or 2. Laminated between the transfer substrate and the water absorption layer, and provided with a functional layer that provides various functions,
The intermediate transfer medium according to claim 1 or 2. The functional layer includes a protective layer for protecting the recording medium;
An optical layer having predetermined optical properties;
A primer layer having high adhesion to both the optical layer and the water absorbing layer;
With
The intermediate transfer medium according to claim 4. The water absorbing layer, the adhesive layer, and the functional layer have a high transmittance of 80% or more for ultraviolet light to near infrared light,
The intermediate transfer medium according to claim 4 or 5. The modified polyalkylene oxide is soluble in alcohol or an aqueous alcohol solution.
The intermediate transfer medium according to any one of claims 1 to 6. A method of manufacturing an intermediate transfer medium that is thermally transferred to a recording medium,
Applying a resin solution for a water absorbing layer containing a modified polyalkylene oxide as a water absorbing resin and drying to form a water absorbing layer laminated directly or indirectly on the transfer substrate;
Applying a resin solution for an adhesive layer containing a thermoplastic resin, drying, laminating the water-absorbing layer, and forming an adhesive layer for adhering to a recording medium made of resin or paper;
A process for producing an intermediate transfer medium comprising: An intermediate transfer medium is a recording medium on which thermal transfer is performed,
The intermediate transfer medium includes a water absorbing layer containing a modified polyalkylene oxide as a water absorbing resin,
An adhesive layer that is laminated on the water-absorbing layer and contains a thermoplastic resin for adhering to a recording medium made of resin or paper;
A recording medium comprising:

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