JP7415656B2 - Thermal transfer image receiving sheet - Google Patents

Description

The present disclosure relates to thermal transfer image-receiving sheets.

Conventionally, various thermal transfer methods have been proposed. For example, a sublimation thermal transfer method is known that has excellent transparency, high intermediate color reproducibility and gradation, and can easily form high-quality images equivalent to conventional full-color photographic images.

Formation of a thermal transfer image using a sublimation type thermal transfer method requires a thermal transfer sheet with a dye layer provided on one side of a base material, and a receiving layer provided on one side of another base material. A thermal transfer image receiving sheet is used. Then, the receptor layer of the thermal transfer image-receiving sheet and the dye layer of the thermal transfer sheet are overlapped, and heat is applied from the back side of the thermal transfer sheet using a thermal head to transfer the dye in the dye layer onto the receptor layer. A print is obtained in which a thermally transferred image is formed on the layer.

Thermal transfer image-receiving sheets used in such thermal transfer methods have a wide variety of uses, and are used, for example, in cards such as ID cards and credit cards that have facial photographs, and in composite photographs at amusement facilities.

Among these diversifying uses, there is a demand for thermal transfer image-receiving sheets with high design.

Patent No. 4372969 Patent No. 4372974 Japanese Patent Application Publication No. 2005-59332

An object of the present disclosure is to provide a thermal transfer image-receiving sheet having a novel design.

The thermal transfer image-receiving sheet of the present disclosure includes a multilayer laminate film and a receptor layer provided on one surface of the multilayer laminate film, and the multilayer laminate film has a thickness of 0.05 μm or more and 0.5 μm or more and different refractive indexes from each other. The following first polyester layers and second polyester layers are alternately laminated so that the total number of layers is 20 or more.

One aspect of the present disclosure further includes an adhesive layer provided on the other surface of the multilayer laminate film and a release part, and a sealing part including the receiving layer, the multilayer laminate film, and the adhesive layer, and the release part. The mold part is integral with the mold part, and the seal part can be peeled off from the mold release part.

In one aspect of the present disclosure, the seal portion has a minimum transmittance of light in a wavelength range of 400 nm to 700 nm that is 30% or more lower than an average transmittance in a wavelength range of 720 nm to 780 nm.

In one aspect of the present disclosure, the seal portion further includes a seal portion base material provided between the multilayer laminated film and the receptor layer.

According to the present disclosure, a novel design can be imparted to a thermal transfer image-receiving sheet.

FIG. 1 is a schematic cross-sectional view showing an example of a seal-type thermal transfer image-receiving sheet according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view showing an example of a seal-type thermal transfer image-receiving sheet according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view showing an example of a seal-type thermal transfer image-receiving sheet according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view showing an example of a seal-type thermal transfer image-receiving sheet according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view showing an example of a thermal transfer image-receiving sheet according to an embodiment of the present disclosure.

Embodiments of the present disclosure will be described below with reference to the drawings and the like. Note that the present disclosure can be implemented in many different modes, and should not be interpreted as being limited to the contents of the embodiments exemplified below. In addition, in order to make the explanation more clear, the drawings may schematically represent the width, thickness, etc. of each part compared to the actual aspect, but this is only an example and does not limit the interpretation of the present disclosure. It's not a thing. In addition, in the specification of the present application and each figure, the same elements as those described above with respect to the existing figures are denoted by the same reference numerals, and detailed explanations thereof may be omitted as appropriate.

<<Seal type thermal transfer image receiving sheet>>
As shown in FIGS. 1 to 4, in the sealed thermal transfer image-receiving sheet 100 according to the embodiment of the present disclosure, the mold release part 10 and the seal part 50 are integrated, and the seal part 50 is the mold release part. It is provided so that it can be peeled off from 10. Further, the sealing part 50 has a laminated structure in which an adhesive layer 51, a multilayer laminated film 52, and a receiving layer 56 capable of receiving a sublimable dye are laminated in this order from the mold release part 10 side.

The multilayer laminated film 52 is made by laminating a large number of layers with a low refractive index and layers with a high refractive index alternately, and selectively reflects or transmits light of a specific wavelength due to structural optical interference between the layers. By setting specific wavelengths in the visible light range, the color changes depending on the viewing angle, for example.

The multilayer laminated film 52 is, for example, made by alternately laminating first polyester layers and second polyester layers having different refractive indexes and having a thickness of about 0.05 μm or more and 0.5 μm or less so that the total number of layers is 20 or more. It is something. Desired reflective performance can be obtained by setting the thickness of one layer to 0.05 μm or more and 0.5 μm or less. The thickness of each layer can be measured by embedding the laminate in epoxy resin, cutting it into a thin film section with a thickness of about 50 nm using a microtome, and observing it using a transmission electron microscope. The difference in refractive index between the first polyester layer and the second polyester layer is preferably 0.03 or more, more preferably 0.05 or more. The upper limit of the difference in refractive index is about 0.2.

The sealing part 50 including the multilayer laminated film 52 preferably has a minimum light transmittance in a wavelength range of 400 nm or more and 700 nm that is 30% or more lower than the average value of transmittance in a wavelength range of 720 nm or more and 780 nm, and preferably 40% or more. More preferably, it is low.

Since the seal portion 50 including the multilayer laminated film 52 changes color by changing the viewing angle, it is possible to give the seal portion 50 an innovative design. Furthermore, it has high anti-counterfeiting properties and is suitable for security purposes.

Each structure of the seal-type thermal transfer image-receiving sheet 100 will be specifically described below.

<Mold release part>
The mold release section 10 is an essential component of the seal-type thermal transfer image-receiving sheet 100. The mold release part 10 as an example is comprised from the base material 11 (Hereinafter, it may be called the base material for mold release parts.). The mold release part 10 may be made of one member or may be a laminate of a plurality of members. For example, as shown in FIG. 1, the mold release part 10 may be composed of only the base material 11, or as shown in FIG. Good too. Also, other configurations may be used.

(Base material for mold release part)
As the base material 11 for the mold release part, for example, stretched or unstretched plastic base materials (films, ), high quality paper, coated paper, resin coated paper, art paper, cast coated paper, paperboard, emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internally added paper, cellulose fiber paper, etc. can. Further, as the mold release part base material 11, a base material (film) having voids inside can also be used. As for the base material having voids, those described below in connection with the seal portion base material 54 can be appropriately selected and used.

The thickness of the release part base material 11 may be determined in consideration of the overall thickness of the seal-type thermal transfer image-receiving sheet 100, and is, for example, 50 μm or more and 150 μm or less.

In order to improve the peelability of the seal part 50 from the mold release part 10, as shown in FIG. 2, a laminate of a mold release part base material 11 and a mold release layer 12 may be used as the mold release part 10. can.

Components of the release layer 12 include components having release properties, such as waxes, silicone waxes, silicone resins, various silicone-modified resins such as silicone-modified acrylic resins, fluororesins, fluorine-modified resins, polyvinyl alcohol, and acrylic resins. , thermosetting epoxy-amino copolymers, thermosetting alkyd-amino copolymers (thermosetting amino alkyd resins), melamine resins, cellulose resins, urea resins, polyolefins, acrylic resins, and the like. The release layer 12 may contain one type of component alone, or may contain two or more types of components.

The thickness of the release layer 12 is, for example, 0.1 μm or more and 0.4 μm or less.

Moreover, a back layer (not shown) can also be provided on the surface of the base material 11 for the mold release part opposite to the surface on which the mold release layer 12 is provided. Moreover, a back primer layer can also be provided between the mold release part base material 11 and the back layer. Moreover, an antistatic layer can also be provided on the surface of the back layer opposite to the surface on which the mold release part base material 11 is provided. Note that the back layer, the back primer layer, and the antistatic layer are arbitrary layers constituting the mold release section 10.

Components of the back layer include, for example, polyolefins such as polyethylene and polypropylene, polyester, polyacrylic ester, polyvinyl acetate, styrene acrylate, polyurethane, polystyrene, polyvinyl chloride, polyether, polyamide, polyimide, polyamideimide, polycarbonate, Examples include thermoplastic resins such as polyacrylamide, polyvinyl chloride, and polyvinyl acetal, and silicone modified products thereof.

<Seal part>
As shown in FIGS. 1 and 2, a seal portion 50 is provided on the mold release portion 10 so as to be peelable from the mold release portion 10. As shown in FIGS. The sealing part 50 has a laminated structure in which an adhesive layer 51, a multilayer laminated film 52, and a receiving layer 56 capable of receiving a sublimable dye are laminated in this order from the mold release part 10 side. The seal portion 50 may be composed only of the adhesive layer 51, the multilayer laminated film 52, and the receiving layer 56, or may include any other layers.

For example, as shown in FIG. 3, the sealing part 50 is formed by laminating an adhesive layer 51, a multilayer laminated film 52, an adhesive layer 53, a sealing part base material 54, and a receiving layer 56 in this order from the mold release part 10 side. It may also have a laminated structure.

Further, as shown in FIG. 4, the sealing part 50 is arranged in order from the mold release part 10 side: an adhesive layer 51, a multilayer laminated film 52, an adhesive layer 53, a base material for the sealing part 54, a primer layer 55, and a receiving layer 56. It is also possible to have a laminated structure in which the layers are laminated in this order.

(adhesive layer)
There are no particular limitations on the components of the adhesive layer 51, and examples include acrylic resin, vinyl resin, polyester, urethane resin, polyamide, epoxy resin, rubber resin, and ionomer resin. The thickness of the adhesive layer 51 is not particularly limited, but is generally 5 μm or more and 20 μm or less, preferably 8 μm or more and 10 μm or less.

(Multilayer laminated film)
A multilayer laminated film 52 is provided on the adhesive layer 51. The multilayer laminated film 52 includes a first polyester layer made of a polyester composition and having a thickness of 0.05 μm or more and 0.5 μm or less, and a second polyester layer also made of a polyester composition and having a thickness of 0.05 μm or more and 0.5 μm or less. At least 20 layers are laminated alternately. By setting the number of laminated layers to 20 or more, selective reflection due to multiple interference becomes large, and sufficient reflectance can be obtained. The upper limit of the number of laminated layers is preferably about 500 layers from the viewpoint of productivity and the like.

The polyesters constituting the first polyester layer and the second polyester layer of the multilayer laminated film 52 are each crystalline polyester, and the proportion of the ethylene terephthalate component is 80 mol% or more based on the total repeating units of the polyester. This improves the interlayer adhesion between the first polyester layer and the second polyester layer.

As the copolymerization component other than the ethylene terephthalate component, 2,6-naphthalene dicarboxylic acid or isophthalic acid component is preferable because it tends to lower the melting point. Based on all repeating units, 1.5 mol% or more and 20 mol% or less is 2,6-naphthalenedicarboxylic acid or isophthalic acid component. This makes it possible to maintain a sufficient refractive index difference between the first polyester layer and the second polyester layer and to maintain good adhesion between the layers.

The resin constituting the first polyester layer preferably has an ethylene terephthalate component as a main repeating unit. Since the melting point can be maintained higher than that of the polyester constituting the second polyester layer described later, it is preferable that 95 mol% or more of the repeating units consist of an ethylene terephthalate component. Among these, homopolyethylene terephthalate, in which 100 mol% of the repeating units are ethylene terephthalate components, is preferred because it can maintain a high melting point. Copolymerization components other than the ethylene terephthalate component include other aromatic carboxylic acids such as isophthalic acid, 2,6-naphthalene dicarboxylic acid, and 2,7-naphthalene dicarboxylic acid; adipic acid, azelaic acid, sebacic acid, and decane dicarboxylic acid. Aliphatic dicarboxylic acids such as acids; acid components such as alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, aliphatic diols such as butanediol, hexanediol, etc.; glycol components such as alicyclic diols such as cyclohexanedimethanol. can be mentioned preferably.

The resin constituting the second polyester layer preferably has an ethylene terephthalate component as a main repeating unit. In particular, crystalline polyester is preferred. In addition, since the melting point can be lower than that of the polyester constituting the first polyester layer, 75 mol% or more and 97 mol% or less of the repeating units are composed of ethylene terephthalate component, and 3 mol% or more and 25 mol% or less are other components. Copolymerized polyethylene terephthalate consisting of a copolymerized component is preferred. Copolymerization components other than the ethylene terephthalate component include other aromatic carboxylic acids such as isophthalic acid, 2,6-naphthalene dicarboxylic acid, and 2,7-naphthalene dicarboxylic acid; adipic acid, azelaic acid, sebacic acid, and decane dicarboxylic acid. Aliphatic dicarboxylic acids such as acids; acid components such as alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, aliphatic diols such as butanediol, hexanediol, etc.; glycol components such as alicyclic diols such as cyclohexanedimethanol. can be mentioned preferably.

The multilayer laminated film 52 is obtained by alternately stacking 20 or more layers of polyester for the first polyester layer and polyester for the second polyester layer in a molten state.

(receptive layer)
There are no particular limitations on the components of the receptor layer 56. For example, polyolefin resins such as polypropylene, halogenated resins such as polyvinyl chloride or polyvinylidene chloride, vinyl resins such as polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, ethylene-vinyl acetate copolymers, or polyacrylate esters. , polyesters such as polyethylene terephthalate or polybutylene terephthalate, copolymers of polyolefins such as ethylene or propylene and other vinyl polymers, cellulose resins such as ionomers or cellulose diacetate, solvent-based materials such as polycarbonate, polystyrene, polyamide, acrylic resins, etc. The following resins can be mentioned. These materials may be used alone or in combination of two or more. The thickness of the receiving layer 56 is not particularly limited, but is preferably 0.5 μm or more and 10 μm or less, more preferably 2 μm or more and 5 μm or less.

Dye sublimation transfer is a suitable image forming method because it can form images with excellent transparency; however, image forming methods are not limited to this, and include melt transfer using pigments as coloring materials, inkjet printing, gravure printing, etc. There may be.

(Base material for seal part)
As shown in FIG. 3, in order to suppress the loss of energy applied from the heating member when forming an image on the receptor layer 56, and to support the seal portion 50, a seal portion is provided under the receptor layer 55. A base material 54 may be provided.

The base material 54 for the sealing portion may be a stretched or unstretched base material (film) of polyester such as polyethylene terephthalate or polyethylene naphthalate, or a plastic such as polypropylene, polycarbonate, cellulose acetate, polyethylene derivative, polyamide, or polymethylpentene. ), etc. The seal portion base material 54 may have a single layer structure or may be a composite base material in which two or more layers are laminated.

The thickness of the seal portion base material 54 is preferably 50 μm or more and 100 μm or less.

(Adhesive layer)
The adhesive layer 53 is not particularly limited as long as it has the function of bonding the multilayer laminated film 52 and the seal portion base material 54. Examples of the adhesive component used in the adhesive layer 53 include polyurethane, polyolefin such as α-olefin-maleic anhydride resin, polyester, acrylic resin, epoxy resin, urea resin, melamine resin, phenol resin, vinyl acetate resin, and cyanoacrylate. Examples include resins and the like. Among them, reactive types of acrylic resins and modified acrylic resins can be preferably used. Further, it is preferable to cure the adhesive using a curing agent because this improves adhesive strength and heat resistance. As the curing agent, isocyanate compounds are generally used, but aliphatic amines, cycloaliphatic amines, aromatic amines, acid anhydrides, etc. can also be used.

The thickness of the adhesive layer 53 is 0.5 μm or more and 6 μm or less, preferably 1 μm or more and 5 μm or less.

(Primer layer)
In order to improve interlayer adhesion, a primer layer 56 can be provided between the seal portion base material 54 and the receiving layer 56.

Components of the primer layer 55 include, for example, polyester, polyacrylate, polyvinyl acetate, polyurethane, styrene acrylate, polyacrylamide, polyamide, polyether, polystyrene, polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyvinylpyrrolidone, etc. Examples include vinyl resins, polyvinyl acetals such as polyvinyl acetoacetal and polyvinyl butyral, and inorganic particles.

Although there is no particular limitation on the thickness of the primer layer 55, it is preferably 0.6 μm or more, and more preferably 1 μm or more. There is no particular limitation on the upper limit, but it is approximately 2.5 μm.

There is no particular limitation on the overall thickness of the seal-type thermal transfer image-receiving sheet 100, but it is generally 150 μm or more and 300 μm or less, preferably 175 μm or more and 250 μm or less.

Since the seal portion 50 includes the multilayer laminated film 52, a novel design can be imparted to the seal portion 50.

Although the position of the multilayer laminated film 52 in the sealing part 50 is not particularly limited, it is preferable that the multilayer laminated film 52 be provided at a position away from the receptor layer 56 in order to suppress the influence of heating on the receptor layer 56 during image formation.

The receptive layer may be provided on the seal portion having the adhesive layer, or may be provided on the mold release portion having the release layer. For example, it may be a sealed thermal transfer image-receiving sheet in which a first base material, an adhesive layer, a release layer, a multilayer laminated film, a second base material, and a receptor layer are laminated in this order. In this case, the first base material and the adhesive layer serve as the sealing part, and the release layer, multilayer laminate film, second base material, and receiving layer serve as the release part.

Further, instead of the adhesive layer, a pseudo-adhesive layer whose re-adhesiveness decreases once it is peeled off may be provided.

In the above embodiment, the configuration of a seal-type thermal transfer image-receiving sheet having a release part and a sealing part has been described, but it may be a thermal transfer image-receiving sheet that is not a seal-type and includes a multilayer laminated film. For example, as shown in FIG. 5, a thermal transfer image-receiving sheet 110 may have a base material 54, an adhesive layer 53, a multilayer laminated film 52, and a receptor layer 56, which are laminated in this order.

Next, the present disclosure will be described in more detail with reference to Examples. Hereinafter, unless otherwise specified, parts and % are based on mass, and are values before being converted to solid content.

(Example 1)
A polyethylene terephthalate film (S100#75, Mitsubishi Chemical Corporation) with a thickness of 75 μm was used as the base material for the mold release part, and a coating liquid for the mold release layer having the following composition was applied to one side of the base material for the mold release part. was coated and dried to a dry thickness of 0.25 μm to form a release layer on the base material for the release part.

Further, on the other side of the base material for the mold release part, a primer layer coating liquid having the following composition was applied and dried to a dry thickness of 1.5 μm to form a primer layer. Then, on the primer layer, a back layer coating liquid having the following composition was applied and dried to a dry thickness of 0.7 μm to form a back layer. Then, on the back layer, an antistatic layer coating liquid having the same composition as the primer layer is applied and dried to a dry thickness of 0.1 μm to form an antistatic layer. A mold release part was obtained in which a prevention layer, a back layer, a primer layer, a base material for a mold release part, and a mold release layer were laminated in this order.

In addition, a polyethylene terephthalate film (S100#75, Mitsubishi Chemical Corporation) with a thickness of 75 μm was used as the base material for the seal part, and a primer layer having the same composition as the primer layer described above was formed on one side of the base material for the seal part. A coating liquid was applied and dried to a dry thickness of 1.5 μm to form a primer layer, and on this primer layer, a receptor layer coating liquid having the following composition was applied to a dry thickness of 1.5 μm. It was coated and dried to a thickness of 4.2 μm to form a receptor layer.

Further, on the other side of the base material for the seal portion, a coating liquid for an adhesive layer having the following composition was applied and dried to a dry thickness of 4.5 μm to form an adhesive layer.

101 first polyester layers having a thickness of 0.065 μm made of polyethylene terephthalate and 100 second polyester layers having a thickness of 0.065 μm made of polyethylene terephthalate copolymerized with 12 mol % of isophthalic acid are laminated alternately, A multilayer laminated film having a thickness of 13 μm was prepared and placed on the adhesive layer. Then, a coating liquid for the adhesive layer is applied and dried to a dry thickness of 9 μm on the multilayer laminated film to form an adhesive layer, and a primer is applied to one side of the base material for the sealing part. A sealing part was obtained in which the layer and the receiving layer were provided in this order, and the adhesive layer, the multilayer laminated film, and the adhesive layer were provided in this order on the other surface of the sealing part base material.

Next, the mold release part and the seal part are bonded together so that the mold release layer of the mold release part and the adhesive layer of the seal part face each other, thereby providing an embodiment in which the mold release part and the seal part are integrated. A sealed thermal transfer image-receiving sheet of No. 1 was obtained.

(Coating liquid for mold release layer)
・Addition polymerization agent silicone (KS847H Shin-Etsu Chemical Co., Ltd.) 100 parts ・Toluene 200 parts

(Coating liquid for primer layer)
・Polyurethane (N-5199 Nippon Polyurethane Industries Co., Ltd.) 15 parts ・Curing agent (Takenate (registered trademark) A-14 Mitsui Chemicals, Inc.) 6 parts ・Toluene 38.5 parts ・Methyl ethyl ketone 38.5 parts

(Coating liquid for back layer)
・Polyvinyl butyral 10 parts (Denka Butyral 3000-1 Denka Co., Ltd.)
・Nylon filler (average particle size 7.5 μm) 2 parts (MW330 Shinto Paint Co., Ltd.)
・Pt catalyst 0.44 parts (CAT-PL-50T Shin-Etsu Chemical Co., Ltd.)
・Reaction retardant 0.36 parts (CAT-PLR-5 Shin-Etsu Chemical Co., Ltd.)
・Titanium chelate 2.4 parts (AT chelating agent Denka Polymer Co., Ltd.)
・Toluene 30 parts ・Isopropyl alcohol 30 parts

(Coating liquid for receptor layer)
・12 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) C Nissin Chemical Industry Co., Ltd.)
・Epoxy modified silicone (X-22-3000T Shin-Etsu Chemical Co., Ltd.) 0.8 part ・Amino modified silicone 0.24 part (X-22-1660B-3 Shin-Etsu Chemical Co., Ltd.)
・Toluene 30 parts ・Methyl ethyl ketone 30 parts

(Coating liquid for adhesive layer)
・30 parts of polyfunctional polyol (Takelac (registered trademark) A-969-V Mitsui Chemicals, Inc.)
・Isocyanate (Takenate (registered trademark) A-5 Mitsui Chemicals, Inc.) 10 parts ・Ethyl acetate 60 parts

(Coating liquid for adhesive layer)
・Acrylic copolymer (SK Dyne 1251 Soken Chemical Co., Ltd.) 15 parts ・Curing agent (L-45 Soken Chemical Co., Ltd.) 0.33 parts ・Curing agent (E-AX Soken Chemical Co., Ltd.) 0.1 parts/ethyl acetate 16.14 parts

(Example 2)
Example 2 was carried out in the same manner as in Example 1, except that the first polyester layer had a thickness of 0.08 μm, the second polyester layer had a thickness of 0.08 μm, and a multilayer laminated film with a thickness of 16.5 μm was used. A sealed thermal transfer image-receiving sheet was obtained.

(Example 3)
The seal of Example 3 was prepared in the same manner as in Example 1, except that the first polyester layer had a thickness of 0.095 μm, the second polyester layer had a thickness of 0.095 μm, and a multilayer laminated film with a thickness of 19 μm was used. A thermal transfer image-receiving sheet was obtained.

(Comparative example 1)
A sealed thermal transfer image-receiving sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the adhesive layer and multilayer laminated film were omitted from the sealed portion.

(Measurement of transmission spectrum)
The transmittance of the seal portion of each Example and Comparative Example in the wavelength range of 400 to 780 nm was measured using an ultraviolet-visible-near-infrared spectrophotometer (UV-3100, manufactured by Shimadzu Corporation). The difference between the average transmittance in the wavelength range of 720 nm to 780 nm and the minimum transmittance of light in the wavelength range of 400 nm to 700 nm was determined. The results are shown in Table 1.

(Evaluation of discoloration)
The sealed thermal transfer image-receiving sheets of each Example and Comparative Example were held in hand and the appearance was visually observed from the sealed portion side while changing the inclination. The seal portions of the sealed thermal transfer image-receiving sheets of Examples 1 to 3 changed color as the viewing angle changed. The color of the sealed portion of the sealed thermal transfer image-receiving sheet of Comparative Example 1 did not change even when the viewing angle changed.

10 Release part 11 Base material for release part 12 Release layer 50 Seal part 51 Adhesive layer 52 Multilayer laminated film 53 Adhesive layer 54 Base material for seal part 55 Primer layer 56 Receptive layer 100 Seal-type thermal transfer image-receiving sheet

Claims (4)

A multilayer laminated film, and a receptor layer provided on one side of the multilayer laminated film,
The multilayer laminated film is made by alternately laminating first polyester layers and second polyester layers having a thickness of 0.05 μm or more and 0.5 μm or less and having different refractive indexes so that the total number of layers is 20 or more. the law of nature,
The polyester constituting the first polyester layer and the second polyester layer are each crystalline polyester, and the proportion of the ethylene terephthalate component is 80 mol% or more based on the total repeating units of the polyester. A thermal transfer image-receiving sheet. further comprising an adhesive layer provided on the other surface of the multilayer laminated film and a mold release part,
Claim characterized in that the sealing part including the receptor layer, the multilayer laminated film, and the adhesive layer and the mold release part are integrated, and the seal part is peelable from the mold release part. 1. The thermal transfer image-receiving sheet according to 1. 3. The thermal transfer image-receiving sheet according to claim 2, wherein the seal portion has a minimum light transmittance in a wavelength range of 400 nm to 700 nm that is 30% or more lower than an average transmittance in a wavelength range of 720 nm to 780 nm. 4. The thermal transfer image-receiving sheet according to claim 2, wherein the seal portion further includes a transparent seal portion base material provided between the multilayer laminated film and the receptor layer.

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