JPH11348434A - Sublimation transfer recording method and sublimation transfer recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance resistances such as the light-fastness, anti-fingerprinting property, and plasticizer resistance of a thermal transfer image by adding block isocyanate to the outermost layer of the overcoat layer of a thermal transfer sheet. SOLUTION: To the outermost layer of the overcoat layer 15 of a thermal transfer sheet 1, block isocyanate expressed by formula I (R shows an alkyl group, and BL is a reaction inhibitor group) and resin having a functional group reacting with isocyanate are added, and image receiving paper having a functional group reacting with isocyanate is used in the image receiving layer; after transferring dye, block isocyanate is activated by its transfer heat during the transfer of the overcoat layer 15, thus allowing the overcoat layer 15 and image receiving layer to be reacted with each other, so that the adhesiveness of the overcoat layer 15 and polymerization of the overcoat layer 15 and resin of the image receiving layer are accomplished, thereby improving the resistances of images.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer sheet having a layer containing a heat-sublimable and heat-migrating dye and a transfer layer which, after dye transfer, is transferred onto an image-receiving layer which receives the dye and becomes an overcoat layer. The present invention relates to a sublimation transfer recording method and a sublimation transfer recording medium for forming an image using a sublimation transfer recording image receiving member having a dye image receiving layer for receiving a dye and an overcoat layer transferred by heat transfer.

[0002]

2. Description of the Related Art Sublimation transfer is one of thermal transfer methods, in which a colorant on a thermal transfer sheet is transferred to a sublimation transfer recording image receptor by heating and pressurizing with a thermal head or the like to form an image. is there. As the thermal transfer sheet, one using a sublimable or heat-migrating dye as a colorant is used. As the image receiving body for sublimation transfer recording, one side of paper, a plastic film, or a laminate of paper and a plastic film is provided with a dye-receiving material. In recent years, an image receiving body provided with a dye image-receiving layer having excellent properties has excellent characteristics in gradation expression, and has recently been particularly widespread. Images obtained by this method are similar to silver halide photographs in the smoothness and density of gradations, and unlike optical silver halide photographs, images can be processed digitally and output in a short time. It is widely used as a substitute for ID photos, output images of computer graphics, print proofs, etc.

[0003]

However, with the diversification of uses and social demands for the same level of resistance as silver halide photography, such as light resistance, fingerprint resistance, plasticizer resistance, etc.
The lack of tolerance in daily life is a major problem. The present invention is intended to solve such problems of the prior art, and improves the light resistance, fingerprint resistance, and plasticizer resistance of a thermal transfer image formed by sublimation transfer recording, and improves the silver salt resistance. The purpose is to make it equal to or more than a photograph.

[0004]

Means for Solving the Problems A first invention of the present invention is:
An ink layer (14) having a sublimable or heat-migrating dye on at least one of the substrates (11) and, after dye transfer, are transferred onto an image-receiving layer (22) that receives the dye, and an overcoat layer (15) is formed. A thermal transfer sheet (1) having a transfer layer
A sublimation transfer recording image receiver (2) having the image receiving layer (22) is superposed on at least one of the substrates (21), and a dye and overcoat are applied to the image receiving layer (22) by a thermal head according to image data. In the printing method for transferring the layer (15), a block isocyanate represented by the general formula [A] and a resin having a functional group which reacts with isocyanate are represented as the outermost layer of the overcoat layer (15) of the thermal transfer sheet (1). When the overcoat layer (15) is transferred after dye transfer using an image receiving paper having a functional group that reacts with the isocyanate in the image receiving layer (22), the blocked isocyanate is activated by the heat of the transfer. Overcoat layer (1
5) and the image receiving layer (22) are reacted to form the overcoat layer (1).
This is a sublimation transfer recording method characterized in that the adhesion of (5) and the resin of the overcoat layer (15) and the image receiving layer (22) are polymerized to improve the image resistance.

[0005]

Embedded image

According to a second aspect of the present invention, there is provided an ink layer (14) having a sublimable or heat-migrating dye on at least one of the substrates (11) and an image-receiving layer (22) receiving the dye after the dye transfer. A thermal transfer sheet (1) having a transfer layer which is transferred upward to become an overcoat layer (15), and an image receiving body (2) for sublimation transfer recording having an image receiving layer (22) on at least one of a substrate (21). In the printing method in which the dye and the overcoat layer (15) are transferred to the image receiving layer (22) by a thermal head according to image data, the outermost layer of the overcoat layer (15) of the thermal transfer sheet (1) Containing a blocked isocyanate represented by the general formula [A] and a resin having a functional group that reacts with isocyanate, and using an image receiving paper having a functional group that reacts with the isocyanate in the image receiving layer (22). After the transfer, overcoat layer (1
5) When transferring, the blocked isocyanate is activated by the heat of the transfer, and the overcoat layer (15) reacts with the image receiving layer (22) to cause the adhesion of the overcoat layer (15) and the overcoat layer (15). A sublimation transfer recording medium characterized in that the resin of the image receiving layer (22) is polymerized to improve the image resistance.

Further, the present invention is the sublimation transfer recording method according to the first aspect, wherein BL in formula (A) is pyrazole.

[0008] In the first aspect of the present invention, the dissociation temperature of the blocked isocyanate is from 90 ° C to 160 ° C.
The following is a sublimation transfer recording method.

Further, the present invention is the sublimation transfer recording medium according to the second aspect, wherein BL in formula (A) is pyrazole.

[0010] In the second aspect of the present invention, the dissociation temperature of the blocked isocyanate is from 90 ° C to 160 ° C.
The following is a sublimation transfer recording medium.

[0011]

Means provided by the present invention to solve the above-mentioned problems is to provide an ink layer (14) having a sublimable or heat-migrating dye on at least one of the substrates (11),
A thermal transfer sheet (1) having a transfer layer which is transferred onto an image receiving layer (22) for receiving a dye and becomes an overcoat layer (15); and the image receiving layer (22) on at least one of the substrates (21). Overlay the sublimation transfer recording image receiver (2)
The image receiving layer (2
2) In the printing method for transferring the dye and the overcoat layer (15) to the outermost layer of the overcoat layer (15) of the thermal transfer sheet (1), the outermost layer of the thermal transfer sheet (1) reacts with the blocked isocyanate represented by the general formula [A] and the isocyanate When the overcoat layer (15) is transferred after dye transfer by using an image receiving paper having a functional group that reacts with the isocyanate in the image receiving layer (22), heat of the transfer is used. The blocked isocyanate is activated, and the overcoat layer (15) reacts with the image receiving layer (22) to cause the adhesion of the overcoat layer (15) and the overcoat layer (1).
5) To provide a sublimation transfer recording method and a medium capable of forming an image having good durability by polymerizing the resin of the image receiving layer (22).

In the present invention, the outermost layer of the overcoat layer (15) of the thermal transfer sheet (1) contains the blocked isocyanate represented by the above general formula [A] so that the image and the overcoat can be formed. After the transfer of the layer (15), the blocked isocyanate is activated by the heating energy at the time of transfer of the overcoat layer (15), and a crosslinking reaction is caused between the resin of the overcoat layer (15) and the resin of the image receiving layer (22) and the isocyanate. By doing so, it is possible to form complex three-dimensional crosslinks, fix dyes, and form a transfer image similar to a silver halide photograph, with light resistance, fingerprint resistance, plasticizer, abrasion resistance, etc. in everyday life. It becomes possible.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a schematic sectional view of a thermal transfer sheet of the present invention, and FIG. 2 is a schematic sectional view of a sublimation transfer recording image receiver of the present invention. 1 and 2, 1 is a thermal transfer sheet, 11 is a base material, 12 is a back coat layer, 13 is an easily adhesive layer, 14 is an ink layer, 141 is a cyan ink layer, 142 is a magenta ink layer, and 143 is yellow ink. Layer, 15 is an overcoat layer, 151 is a release layer, 152 is a release layer, 153 is an adhesive layer, 2 is an image receiving body for sublimation transfer recording, 21 is a substrate, and 22 is an image receiving layer.

FIG. 1 shows the basic structure of the thermal transfer sheet used in the present invention. The ink layer (14) may be a single color such as black, or four colors obtained by adding black to three colors. Release layer (15) of overcoat layer (15)
1) may be omitted as long as the overcoat layer (15) peels off during transfer. As the base material (11), paper such as condenser paper, a polyester film, a polystyrene film, a polypropylene film, cellophane, or the like is used from the viewpoint of easy formation and handling of the ink layer (14) and mechanical strength. Among them, a polyester film (particularly, polyethylene terephthalate [PET] or polyethylene naphthalate [PE]
N], etc.). In addition, the thickness of the base material (11) is 2 μm or more from the viewpoint of mechanical strength, easy handling, or easy availability.
50 μm is good, but 2 μm to 16 μm is more preferable in order to expect a higher effect of the present invention (because it is related to thermal characteristics such as heat conductivity, heat transfer coefficient, and heat storage performance).

The easy-adhesion treatment layer (13) is originally provided in order to improve the adhesion between the ink layer (14) and the substrate (11), and is often treated when forming the substrate. .
Cellulose derivatives, styrene resin, styrene copolymer resin, acrylic resin, methacrylic resin, rosin ester resin, polyvinyl acetate resin, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, polyester resin, polyurethane One or more of resin, butyral resin, polyamide resin, petroleum resin, chlorinated rubber, and chlorinated polyolefin resin are used. This normal thickness is 1 μm or less.

Next, the dye used in the ink layer (14) is, for example, Solvent Yellow 56, 16, 30, 9 as a yellow component of the yellow ink layer (143).
3,33, Disperse Yellow 201,231,33
And so on. Examples of the magenta component of the magenta ink layer (142) include C.I. I. Disperse thread 60,
C. I. Disperse Violet 26, C.I. I. Solvent Red 27 or C.I. I. Solvent Red 19 and the like. Examples of the cyan component of the cyan ink layer (141) include C.I. I. Disperse Blue 354, C.I. I. Solvent Blue 63, C.I. I. Solvent Blue 36 or C.I. I. Disperse Blue 24 and the like. As the black dye, the above-mentioned respective dyes are combined and toned. Examples of the binder resin for the ink layer include cellulose resins such as ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, and cellulose acetate, butyral resin, acetal resin, phenoxy resin, polycarbonate resin, polyester resin, and the like.

The ratio of the dye to the binder resin in the ink layer is from dye / resin = 10/100 to 300/1.
00 is preferred. This is because the dye / resin ratio is 10 /
If it is less than 100, the amount of the dye is too small and the color development sensitivity becomes insufficient, so that a good thermal transfer image cannot be obtained. If the ratio exceeds 300/100, the solubility of the dye in the binder resin is extremely reduced. When the thermal transfer sheet is used, the storage stability of the ink layer deteriorates (because the dye tends to precipitate). In order to expect a higher effect in the present invention, dye / resin = 40/100 to 20/100
0/100 is even more preferred.

The ink layer (14) of the thermal transfer sheet of the present invention
Is basically formed of the above-mentioned material, but in order to prevent fusion between the thermal transfer sheet (1) and the sublimation transfer recording image receiver (2) during thermal transfer, the sublimation transfer recording image receptor (2) is used. It is preferable to consider compatibility with 2) and to add a release agent to the ink layer if necessary. The addition amount of the release agent is preferably about 0.01% to 10% based on the solid content of the ink layer. If the amount is less than 0.01%, the releasability cannot be sufficiently exhibited.
There are various problems such as difficulty in forming the thermal transfer layer on the base sheet by coating, and excessively increasing the amount of bleed on the surface of the ink layer, which tends to cause soiling of the transfer receiving body. To come.

The ink layer (14) is preferably prepared by adding the above-mentioned dye, binder resin and other additives in an appropriate solvent to dissolve or disperse the respective components to prepare an ink for a thermal transfer layer. It is formed by coating and drying on a substrate (11) (coating). The ink layer (that is, the dye-carrying layer) thus formed has a thickness of 0.2 μm to 5 μm, and more preferably about 0.4 μm to 3 μm. Here, regarding the thickness of the ink layer,
If it is less than 0.2 μm, a sufficient color density cannot be obtained, and
If it exceeds m, there is a disadvantage that the color development sensitivity deteriorates.

Next, the portion of the overcoat layer (15) will be described. First, the release layer (151) is used. The resin used is one of epoxy resin, melamine resin, acrylic resin, urethane resin and silicone resin. A kind or a mixture of two or more kinds and cured is used. Usually, the thickness is 0.1 μm to 2 μm.

The resin used for the release layer (151) is a cellulose derivative, a styrene resin, a styrene copolymer resin, an acrylic resin, a methacrylic resin, a rosin ester resin, a polyvinyl acetate resin, a polyvinyl chloride, a vinyl chloride / vinyl acetate. One or more of a copolymer, an ethylene / vinyl acetate copolymer, a polyester resin, a polyurethane resin, a butyral resin, a polyamide resin, a petroleum resin, a chlorinated rubber, and a chlorinated polyolefin resin are used. A slip agent may be added to improve the abrasion resistance of the printed image. As the slip agent, wax, particularly polyethylene wax, silicone oil, silicone powder, fluorine powder and the like are suitable. In order to improve the light resistance after printing, an ultraviolet absorber may be added. When transferring the overcoat layer after printing, if a functional group capable of reacting with the activated isocyanate is present in the resin, the release layer and the adhesive layer react with the isocyanate, thereby improving the adhesiveness and polymerizing. , Improves resistance. Normal thickness is 0.5μm ~ 3μm
It is.

The resin used for the adhesive layer (153) includes cellulose derivatives, styrene resins, styrene copolymer resins, acrylic resins, methacrylic resins, rosin ester resins, polyvinyl acetate resins, polyvinyl chloride, vinyl chloride and vinyl acetate. One or more of a polymer, an ethylene / vinyl acetate copolymer, a polyester resin, a polyurethane resin, a butyral resin, a polyamide resin, a petroleum resin, a chlorinated rubber, and a chlorinated polyolefin resin are used. The resin used must have a functional group that reacts with isocyanate. In this layer, block isocyanate which is the core of the present invention is added. As the blocked isocyanate, the dissociation temperature is 9
Those having a temperature of 0 ° C to 160 ° C are preferred. Dissociation temperature is 1
When a blocked isocyanate exceeding 60 ° C. is used,
Sufficient dissociation reaction does not occur only with the heating energy of the thermal head during transfer of the overcoat layer, and the effect may be reduced. At a dissociation temperature of less than 90 ° C., when the ink layer and the overcoat layer are applied to the thermal transfer sheet,
There is a risk of dissociation at that drying temperature.

At the time of transfer of the overcoat layer (15), the dissociated activated isocyanate, the adhesive layer resin, and the resin of the image receiving layer of the image receiving member are cured by reaction to improve adhesion, polymerize, and wear resistance. The resistance such as light resistance, fingerprint resistance, and plasticizer resistance is improved. Further, in order to improve the light resistance after printing, an ultraviolet absorber may be added. Normal thickness is 0.
It is 5 μm to 5 μm. In order to improve the heat resistance and the slipperiness of the thermal transfer sheet, it may be preferable to provide a back coat layer on the surface of the substrate on which the ink layer is not provided. When the requirements for thermal transfer become stricter (for example, a requirement for high-speed thermal transfer, etc.), a back coat layer made of an appropriate material that is compatible with the base sheet material with respect to the basic configuration of the thermal transfer sheet is used. By combining them, it is possible to easily cope with stricter requirements.

Next, the image receiver will be described. FIG. 2 shows a sublimation transfer recording image receiver used in the present invention. The thickness of the substrate is not particularly limited, but is generally 25 μm to 300 μm, preferably 7 μm, in consideration of the transportability of the printer.
5 μm to 200 μm. The image receiving layer is a dye receiving resin having a group that reacts with isocyanate, and is a cellulose derivative, a styrene resin, a styrene copolymer resin, an acrylic resin, a methacryl resin, a rosin ester resin, a polyvinyl acetate resin, a polyvinyl chloride, a polyvinyl chloride, and a vinegar. One or more of a bi-copolymer, ethylene-vinyl acetate copolymer, polyester resin, polyurethane resin, butyral resin, polyamide resin, petroleum resin, chlorinated rubber, and chlorinated polyolefin resin are used. Usually, the thickness is generally 1 μm to 10 μm.

There is no problem even if various fillers such as silicone oil, silicone powder and silica are appropriately added to the dye receiving layer. Further, there is no problem even if there is an anchor layer or an image printing layer between the substrate and the dye image-receiving layer for assisting the adhesion of the dye image-receiving layer to the substrate.

The image receptor for sublimation transfer recording of the present invention can be produced by a conventional method. For example, a dye image-receiving layer forming composition is coated on one of the substrates by a coating method such as gravure, Mayer bar or roll coating. It can be manufactured by coating and drying to form an image receiving layer.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific embodiments.

<Example 1> (Thermal transfer sheet) As a base material, a mixed resin of an acrylic resin and a polyester resin having a thickness of 0.1 μm, and a 5.5 μm-thick polyester film subjected to an easy adhesion treatment, and the following ink layer (yellow, Magenta and cyan) and an overcoat layer (release layer, release layer, adhesive layer) were pattern-coated with a gravure printer at a drying temperature of 90 ° C. to prepare a sample. The dry film thickness of each ink layer is 1 μm, the release layer is 1 μm, the release layer is 1 μm, and the adhesive layer is 2 μm. [Yellow ink layer ink] C.I. I. Solvent Yellow 93 3.0 parts C.I. I. Solvent Yellow 16 1.0 part Phenoxy resin 5.0 parts Silicon-modified resin 0.05 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts [Magenta ink layer ink] C.I. I. Disperse Red 60 1.5 parts C.I. I. Disperse Violet 26 1.5 parts Phenoxy resin 5.0 parts Silicon-modified resin 0.05 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts [Cyan ink layer ink] I. Solvent Blue 63 1.5 parts C.I. I. Solvent Blue 36 1.5 parts Phenoxy resin 5.0 parts Silicon-modified resin 0.05 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts [Release layer] Silicon resin 30.0 parts Organic sulfonic acid 1.0 parts Toluene 35 3.0 parts Methyl ethyl ketone 35.0 parts [Release layer] Modified acrylic resin (hydroxyl value 3) 30.0 parts Polyethylene powder 1.5 parts Toluene 35.0 parts Methyl ethyl ketone 35.0 parts [Adhesive layer] Modified acrylic resin (Hydroxyl value) 3) 20.0 parts Epoxy resin 10.0 parts Blocked isocyanate (dissociation temperature 120 ° C) 35.0 parts Toluene 35.0 parts Methyl ethyl ketone 35.0 parts Examples of the image receptor for sublimation transfer recording of the present invention include: As a material, a milky white foamed polyethylene terephthalate film (W 00E: Diafoil Hoechst Co., Ltd.) is coated with a composition for forming an image receiving layer having the following composition using a Mayer bar coater and dried, and an image receiving layer having a dry thickness of 4 μm is laminated on a substrate. Then, an image receiving body for sublimation transfer recording of the present invention was produced. (Image-receiving layer for sublimation transfer recording image receiver) Vinyl chloride-vinyl acetate-vinyl alcohol copolymer 20.0 parts Silicone powder 0.5 parts Silicone oil 0.5 parts Solvent (toluene, MEK, EAC) 78 parts

<Comparative Example 1> (Thermal transfer sheet) The same as Example 1 except that the adhesive layer was changed as follows. [Adhesive layer] Modified acrylic resin (hydroxyl value 3) 20.0 parts Epoxy resin 10.0 parts Block isocyanate (dissociation temperature 180 ° C) 1.5 parts Toluene 35.0 parts Methyl ethyl ketone 35.0 parts (Image receiving for sublimation transfer recording) Body image receiving layer) Same as in Example 1.

<Comparative Example 2> (Thermal transfer sheet) The same as Example 1 except that the adhesive layer was changed as follows. [Adhesive layer] Modified acrylic resin (hydroxyl value 3) 20.0 parts Epoxy resin 10.0 parts Block isocyanate (dissociation temperature 80 ° C) 1.5 parts Toluene 35.0 parts Methyl ethyl ketone 35.0 parts (Image receiving for sublimation transfer recording) Body image receiving layer) Same as in Example 1.

<Comparative Example 3> This is a silver salt photograph.

Using a commercially available sublimation transfer type printer, each of the obtained thermal transfer sheets and the image receiving body for sublimation transfer recording are used.
An image transfer was obtained by performing black solid printing. In Comparative Example 2, the overcoat layer did not transfer. In the following evaluations, evaluation was made as data when there was no overcoat layer. These prints were evaluated for various resistances under the following environment. [Environment 1] Use a three-wavelength tube and leave it under a 10,000-lux environment for 6 months. [Environment 2] Apply a commercially available hand cream on the image transfer surface,
After leaving for one day, wipe it off with a commercially available tissue paper. [Environment 3] The image transfer product was placed in a commercially available soft vinyl chloride pass case and left for one month. [Environment 4] T-bar abrasion tester, sand eraser type head, 500 g load, 30 rotations.

The reflection densities of black and white before and after each of the above environmental tests of the image transcripts obtained from the sublimation transfer recording receivers of Example 1 and Comparative Examples 1 and 2 and the silver halide photograph of Comparative Example 3 were measured. The results are shown in [Table 1]. Here, the reflection density measurement is (Ma
cbeth RD-918). Example 1 has almost no fading in any of the environments 1, 2, 3, and 4,
It can be seen that the resistance was much improved as compared with Comparative Examples 1 and 2, and was almost the same as that of the silver halide photograph of Comparative Example 3.

[0034]

[Table 1]

[0035]

According to the present invention, by including a blocked isocyanate in the outermost layer of the overcoat layer of the thermal transfer sheet, the blocked isocyanate is activated by the heating energy during the transfer of the overcoat layer after transferring the image and the overcoat layer, By performing a cross-linking reaction between the resin of the overcoat layer and the resin of the image receiving layer of the image receiving body and the isocyanate, complex three-dimensional crosslinking is performed, the dye is fixed, and light resistance, fingerprint resistance, and plasticizer resistance are achieved. Thus, it was possible to provide a medium capable of forming a transferred image equivalent to a silver halide photograph having a resistance in everyday life such as abrasion resistance.

[Brief description of the drawings]

FIG. 1 shows a schematic cross-sectional view of a thermal transfer sheet of the present invention.

FIG. 2 is a schematic cross-sectional view of the image receiving body for sublimation transfer recording of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thermal transfer sheet 11 ... Base material 12 ... Back coat layer 13 ... Easy adhesion layer 14 ... Ink layer 141 ... Cyan ink layer 142 ... Magenta ink layer 143 ... Yellow ink layer 15 ... Overcoat layer 151 ... Release layer 152 ... Peeling Layer 153 Adhesive layer 2 Sublimation transfer recording image receiving member 21 Substrate 22 Image receiving layer

Claims (6)

[Claims] 1. A thermal transfer sheet having a layer having a sublimable or heat-migrating dye on at least one of its substrates and a dye-migrated dye-transferred image-receiving layer, and having a transfer layer serving as an overcoat layer. In a printing system in which a sublimation transfer recording image receptor having the image receiving layer is superimposed on at least one of the substrates and a dye and an overcoat layer are transferred to the image receiving layer with a thermal head according to image data, The outermost layer of the overcoat layer contains a blocked isocyanate represented by the following general formula [A] and a resin having a functional group reactive with isocyanate, and the image receiving layer has an image receiving paper having a functional group reactive with the isocyanate. When transferring the overcoat layer after dye transfer, the block isocyanate is activated by the heat of the transfer, and the overcoat layer and the image receiving layer react. Adhesion and overcoat layer was the overcoat layer, weighed polymerization of the resin of the image-receiving layer,
A sublimation transfer recording method characterized by improving image resistance. Embedded image 2. The sublimation transfer recording method according to claim 1, wherein in the general formula [A], BL is pyrazole. 3. The dissociation temperature of the blocked isocyanate is 90.
The sublimation transfer recording method according to claim 1, wherein the temperature is not lower than 160 ° C. and not higher than 160 ° C. 4. 4. A thermal transfer sheet having a layer having a sublimable or heat-migrating dye on at least one of the substrates and a dye-transferred image-receiving layer which is transferred onto an image-receiving layer for receiving the dye to form an overcoat layer. In a printing system in which a sublimation transfer recording image receptor having the image receiving layer is superimposed on at least one of the substrates and a dye and an overcoat layer are transferred to the image receiving layer with a thermal head according to image data, The outermost layer of the overcoat layer contains a blocked isocyanate represented by the following general formula [A] and a resin having a functional group reactive with isocyanate, and the image receiving layer has an image receiving paper having a functional group reactive with the isocyanate. When transferring the overcoat layer after dye transfer, the block isocyanate is activated by the heat of the transfer, and the overcoat layer and the image receiving layer react. Adhesion and overcoat layer was the overcoat layer, weighed polymerization of the resin of the image-receiving layer,
A sublimation transfer recording medium characterized by improving image resistance. 5. The sublimation transfer recording medium according to claim 4, wherein in the general formula [A], BL is pyrazole. 6. The dissociation temperature of the blocked isocyanate is 90.
The sublimation transfer recording medium according to claim 4, wherein the temperature is not lower than 160 ° C. and not higher than 160 ° C. 7.