JP2022090738A - Thermal transfer sheet and printed matter - Google Patents

Abstract

To provide: a thermal transfer sheet offering a high-quality printed matter which has good foil cutting characteristics and high gloss and causes no iridescent irregularity; and a high-quality printed matter which has good foil cutting characteristics and high gloss and causes no iridescent irregularity.SOLUTION: A thermal transfer sheet 1 includes: a peeling layer 40 which contains at least a polyester resin and a styrene-acrylic resin as a main ingredient whose weight average molecular weight is 90000 or less, and which has a film thickness of 0.3-0.7 μm; and an adhesive layer 50 containing as a main ingredient a resin other than the styrene-acrylic resin whose weight average molecular weight is 90000 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a thermal transfer sheet and a printed matter used in a sublimation transfer recording type printer.

The thermal transfer sheet refers to an ink ribbon used in a thermal transfer printer, and is also called a thermal ribbon. A general thermal transfer sheet has a structure in which a thermal transfer layer is provided on one surface of a base material, and a heat-resistant slipping layer (back coat layer) is provided on the other surface. Normally, the thermal transfer layer is a layer of ink, and the ink is sublimated (sublimation transfer method) or melted (melt transfer method) by the heat generated in the thermal head of the printer and transferred to the thermal transfer image receiving sheet side. ..

The sublimation transfer method, which is one of the thermal transfer methods, can easily form various images in full color in combination with the high functionality of the printer. Therefore, self-printing of digital cameras, cards such as identification cards, and amu- It is widely used for output materials for equipment. With the diversification of applications, there are increasing calls for smaller size, higher speed, lower cost, and improved durability of the obtained printed matter. In recent years, the same side of the base material has durability against the printed matter. A thermal transfer sheet having a plurality of thermal transfer layers provided so that the thermal transfer protective layers that impart the above-mentioned properties do not overlap each other has become widespread.

The thermal transferable protective layer formed on the surface of the printed matter is required to have the quality of the printed matter in addition to the durability of the image. Specifically, it has high gloss, and there is no occurrence of rainbow unevenness and foil drop. Rainbow unevenness refers to rainbow-colored unevenness due to light interference, and is a phenomenon that is easily visible when light such as a fluorescent lamp is reflected on a printed matter on a black background. Foil removal refers to a phenomenon in which the thermal transfer protective layer, which should originally remain on the thermal transfer sheet, is peeled off and adheres to the printed matter. Ideally, only the portion to which heat is originally applied is transferred to the transferred body as the thermal transfer protective layer, but the thermal transfer protective layer of the non-heat-applied portion is formed as a foil so as to protrude from the end of the printed matter. There are times. In such a thermal transfer sheet having poor foil breakability of the thermal transfer protective layer, the foil is scattered during the transfer process in the printer and adheres to the transferred object before image formation, resulting in imprint defects.

As a technique for suppressing high gloss and rainbow unevenness, it is a protective layer thermal transfer sheet comprising a substrate film and a protective layer formed on at least a part of one surface of the substrate film so that thermal transfer is possible. The release layer formed at the interface on the base film side of the base film is a resin composition containing an acrylic resin and a styrene acrylic resin in combination, and the acrylic resin is 30 to 60 with respect to the total amount of the resin composition. A protective layer thermal transfer sheet has been proposed, which comprises a weight% in the range of 40 to 70% by weight of a styrene acrylic resin and has a thickness of a release layer of 0.5 μm to 1.0 μm (the following). 1).

Further, as a technique for improving the foil breakability, three types of thermal transferable ink layers having at least the hues of yellow (Y), magenta (M), and cyan (C) and thermal transferability are exhibited on one surface of the base sheet. A thermal transfer sheet in which the protective layer is sequentially provided in the longitudinal direction of the substrate sheet, and the peel strength based on JIS K 6854-2 between the substrate sheet side and the thermal transferable protective layer in a 25 ° C environment. A thermal transfer sheet is proposed in which the resin constituting the thermal transferable protective layer is an acrylic resin having a weight average molecular weight (Mw) of 90,000 or less (see Patent Document 2 below). ..

Japanese Patent No. 5641404 Japanese Unexamined Patent Publication No. 2011-93225

However, when an adhesive tape was attached to the release layer of Patent Document 1 and a peel test was performed, the result was that the release layer was easily peeled off. If the adhesion between the base material and the release layer is insufficient in this way, the release layer may peel off from the base material due to the load applied during post-processing such as slits or during printing transfer, which may lead to printing defects. be.

Further, although the thermal transfer sheet of Patent Document 2 showed good foil breakability, gloss and suppression of rainbow unevenness were insufficient.

Therefore, the present invention has been made in view of the above circumstances, and has good foil breakability, a thermal transfer sheet that gives a high-quality printed matter having high gloss and no occurrence of rainbow unevenness, and good foil breakability. Provides high-quality printed matter with high gloss and no rainbow unevenness.

In order to achieve the above object, the present invention employs the following means.
That is, the thermal transfer sheet according to the present invention is formed on a base material, a heat-resistant slipping layer formed on the first surface of the base material, and a second surface of the base material opposite to the first surface. The heat transferable protective layer comprises the heat transferable protective layer, and the heat transferable protective layer has a peeling layer formed on the second surface of the base material and an adhesive layer formed on the peeling layer. The release layer contains at least a polyester resin and a styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component, and has a film thickness of 0.3 μm to 0.7 μm. The adhesive layer has a weight average molecular weight as a main component. It is characterized by containing a resin other than styrene acrylic resin of 90,000 or less.

Further, in the thermal transfer sheet according to the present invention, the solid content weight ratio of the polyester resin in the release layer is preferably 1% to 5%.

Further, in the thermal transfer sheet according to the present invention, the weight average molecular weight of the styrene acrylic resin in the release layer is preferably 30,000 to 70,000.

Further, in the thermal transfer sheet according to the present invention, the weight average molecular weight of the resin as the main component of the adhesive layer is preferably 30,000 to 70,000.

Further, the printed matter according to the present invention is characterized in that the surface layer of the printed matter obtained by transferring the thermal transfer sheet according to any one of the above is the peeling layer.

According to the thermal transfer sheet and the printed matter according to the present invention, it is possible to provide a high-quality printed matter having good foil breakability, high gloss and no occurrence of rainbow unevenness.

It is a schematic sectional drawing which shows an example of the thermal transfer sheet which concerns on one Embodiment of this invention. It is a schematic sectional drawing which shows an example of the thermal transfer sheet which concerns on the modification of one Embodiment of this invention.

An embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a diagram showing a thermal transfer sheet 1 of the present embodiment. The thermal transfer sheet 1 is formed on the sheet-shaped base material 10, the heat-resistant slipping layer 20 formed on the first surface 10a of the base material 10, and the second surface 10b on the opposite side of the first surface 10a of the base material 10. It is provided with a thermal transfer protective layer 30 which has been made. The thermal transferable protective layer 30 has a peeling layer 40 formed on the second surface 10b of the base material 10 and an adhesive layer 50 formed on the peeling layer 40.

The base material 10 includes, for example, a synthetic resin film such as polyethylene terephthalate, polyethylene naphthalate, polypropylene, cellophane, acetate, polycarbonate, polysulfone, polyimide, polyvinyl alcohol, aromatic polyamide, aramid, and polystyrene, condenser paper, and paraffin paper. It is possible to use a single material such as paper or a composite obtained by combining these. Of these, polyethylene terephthalate film is preferable in consideration of physical characteristics, processability, cost, and the like. The thickness thereof is not particularly limited, and is, for example, 2 to 50 μm.

The heat-resistant slipping layer 20 imparts slipperiness to the thermal head. The heat-resistant slipping layer 20 is, for example, a binder resin having excellent heat resistance, a cellulose resin, a polyester resin, an acrylic resin, a vinyl resin, a polyurethane resin, a polyether resin, a polycarbonate resin, an acetal resin, or the like. Consists of. The thickness of the heat-resistant slip layer 20 is preferably 0.1 μm to 2.5 μm.

The release layer 40 contains at least a styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component. The main component means that it occupies 50% or more of the weight solid content ratio after drying. By using styrene acrylic resin as the main component of the release layer 40, high gloss can be imparted to the surface of the printed matter. Further, the larger the molecular weight of the binder resin, the higher the cohesive force of the film, and the more remarkable the occurrence of foil dropping. By setting the weight average molecular weight of the styrene acrylic resin to 90000 or less, the size of the foil can be controlled to about 100 μm or less, which is not a problem in practical use. Further, by limiting the weight average molecular weight of the styrene acrylic resin to 70,000 or less, the size of the foil that cannot be visually recognized can be controlled to about 80 μm or less. On the other hand, if the weight average molecular weight of the styrene acrylic resin is less than 30,000, the durability required for the protective layer, that is, solvent resistance, oil resistance, scratch resistance, etc. may be impaired. The molecular weight is preferably 30,000 or more.

Here, the styrene acrylic resin means the copolymerization of the acrylic acid monomer and the styrene monomer. Examples of the acrylic acid monomer include acrylic acid, methacrylic acid, acrylic acid ester, and methacrylic acid ester. As the styrene monomer, either styrene having a substituent or styrene having no substituent can be used. Examples of applicable commercially available resins include Dianal MB-2539, BR-50, and BR-113 manufactured by Mitsubishi Chemical Corporation.

It is essential that the film thickness of the release layer 40 after drying is 0.3 μm to 0.7 μm. The refractive index n of the styrene acrylic resin is 1.5 to 1.6, and when this is substituted into a conditional expression that creates a bright line, green interference light is obtained when the film thickness is around 0.6 μm, and red when the film thickness is around 0.75 μm. Interference light will be generated. Since the in-plane film thickness deviation is about 0.10 μm, when the film thickness of the heat transferable protective layer 30 exceeds 0.7 μm, green interference light and red interference light are visually recognized, and rainbow unevenness becomes remarkable. Therefore, by designing the film thickness of the release layer 40 to be 0.7 μm or less, red interference light does not appear, and rainbow unevenness can be eliminated. On the other hand, if the film thickness of the release layer 40 is less than 0.3 μm, sufficient gloss of the printed matter cannot be obtained.

Further, the release layer 40 contains at least a polyester resin. Since polyethylene terephthalate is mainly used for the base material 10, the release layer 40 contains a polyester resin having a similar structure, so that the cold adhesion with the base material 10 can be improved. Therefore, it is effective for foil breakability. The content of the polyester resin is preferably 1% to 5% in terms of the resin solid content ratio (solid content ratio) of the release layer 40. If the content of the polyester resin is less than 1%, sufficient cold adhesion to the base material 10 may not be obtained. Further, if the content of the polyester resin exceeds 5%, coagulation fracture occurs during thermal transfer, and there is a concern that the gloss of the printed matter is lowered.

The release layer 40 may contain other resins or additives, if necessary. As other resins, acrylic resins and cellulose derivatives can be preferably used. Examples of the additive include an ultraviolet absorber, a light stabilizer, an antioxidant, a fluorescent whitening agent, a filler and the like.

It is essential that the adhesive layer 50 contains a resin other than the styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component. Similar to the peeling layer 40, when the adhesive layer 50 contains a styrene acrylic resin as a main component, rainbow unevenness occurs. Similar to the peeling layer 40, from the viewpoint of foil breakability, the average molecular weight of the resin of the adhesive layer 50 is essential to be 90,000 or less, more preferably 30,000 to 70,000.

The type of the adhesive layer 50 resin is not limited as long as the above conditions can be satisfied and the thermal transfer adhesiveness can be provided, and for example, an acrylic resin, polyester, epoxy, phenoxy resin and the like can be preferably used.

Further, various functional additives such as an ultraviolet absorber, a light stabilizer, an antioxidant, a catalyst accelerator, a colorant, a gloss adjuster, and a fluorescent whitening agent may be added to the adhesive layer 50. The thickness of the adhesive layer 50 is preferably 0.2 μm to 3 μm in terms of dry film thickness.

When the thermal transfer sheet 1 is thermally transferred to the thermal transfer image receiving sheet, a printed matter having the peeling layer 40 as a surface layer is produced.

In the thermal transfer sheet 1 configured as described above, the release layer 40 contains at least a polyester resin and a styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component, and has a film thickness of 0.3 μm to 0.7 μm and is adhered. The layer 50 contains a resin other than the styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component. As a result, it is possible to provide a high-quality printed matter having good foil breakability, high gloss and no occurrence of rainbow unevenness.

(Modification example)
Next, the thermal transfer sheet according to the modified example of the embodiment shown above will be described mainly with reference to FIG.
In the following embodiments, the same members as those used in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 2 is a diagram showing a thermal transfer sheet 1A of a modified example of the present embodiment. As shown in FIG. 2, the thermal transfer sheet 1A according to the present modification has a sheet-shaped base material 10, a heat-resistant slipping layer 20 formed on the first surface 10a of the base material 10, and a second base material 10. A thermal transfer protective layer 30 and an ink layer 60 are provided on the second surface 10b opposite to the one surface 10a. The thermal transferable protective layer 30 has a peeling layer 40 formed on the second surface 10b of the base material 10 and an adhesive layer 50 formed on the peeling layer 40. The ink layer 60 includes a yellow ink layer 61, a magenta ink layer 62, and a cyan ink layer 63. The yellow ink layer 61, the magenta ink layer 62, the cyan ink layer 63, and the thermal transferable protective layer 30 are arranged in this order on the second surface 10b of the base material 10.

The ink layer 60 is a layer formed by supporting a color material capable of sublimation transfer with an arbitrary resin. As the dye used as the coloring material, any of the dyes used in the conventionally known thermal transfer sheets can be used, and the dye is not particularly limited.

Examples of the dye component of the yellow ink layer 61 include solvent yellow 56, 16, 30, 93, 33, and disperse yellow 201,231,33. Further, as the dye component of the magenta ink layer 62, C.I. I. Disperse thread 60, C.I. I. Disperse Violet 26, C.I. I. Solvent Red 27, or C.I. I. Examples include Solvent Red 19. Further, as the dye component of the cyan ink layer 63, 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 can be mentioned.

The binder used as a constituent material of the ink layer 60 is not particularly limited, but is not particularly limited, and is a vinyl resin such as polyvinyl alcohol, polyvinyl acetate, polyvinylpyrrolidone, polyvinyl acetal, polyvinyl butyral, ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and the like. Heat resistance and dye transfer properties of cellulose-based resins such as hydroxypropyl cellulose, cellulose acetate, butyrate vinegar, cellulose acetate propionate, polyester resin, phenoxy resin, styrene-acrylic nitrile copolymer resin, polycarbonate resin, polyacrylamide resin, etc. Excellent resin can be used. If necessary, in addition to the above resins, resins such as isocyanate-based resins, epoxy-based resins, phenol-based resins, melamine-based resins, and dialdehyde-based resins may be used in order to control the peeling strength.

In the thermal transfer sheet 1A configured as described above, the release layer 40 contains at least a polyester resin and a styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component, and has a film thickness of 0.3 μm to 0.7 μm and is adhered. The layer 50 contains a resin other than the styrene acrylic resin having a weight average molecular weight of 90000 or less as a main component. As a result, it is possible to provide a high-quality printed matter having good foil breakability, high gloss and no occurrence of rainbow unevenness.

Next, the thermal transfer sheet of the present invention will be further described with reference to Examples and Comparative Examples. In the following description, "part" is based on mass unless otherwise specified. Further, the present invention is not limited to the description of Examples.

<Creation of protective layer thermal transfer sheet (thermal transfer sheet)>
(Example 1)
The ink composition for the heat-resistant slip layer having the following composition is adjusted, and the heat-resistant slip layer is applied and dried on a polyethylene terephthalate film having a thickness of 4.5 μm so that the coating amount of the heat-resistant slip layer after drying is 1.0 g / m ² . gone.
[Ink for heat-resistant slip layer]
・ Acrylic polyol resin 70 parts ・ 2-6, tolylene diisocyanate 24 parts ・ Silicone filler (particle size 1.0 μm) 1 part ・ Amino-modified silicone oil 5 parts ・ Methyl ethyl ketone 250 parts ・ Toluene 250 parts

Next, an ink composition for a peeling layer having the following composition is prepared, and the film thickness of the peeling layer 40 after drying is 0 on the surface 10b of the base material 10 opposite to the surface 10a on which the heat-resistant slipping layer 20 is formed. It was applied and dried to a thickness of .5 μm.
[Ink for release layer-1]
・ Dianal (registered trademark) BR-50
(Styrene acrylic resin, Mw = 65000, Mitsubishi Chemical Corporation) 98 copies, Elitel (registered trademark) UE-9900
(Polyester resin, Mn = 15000, Unitika Ltd.) 2 parts, 900 parts of toluene

Next, an ink composition for an adhesive layer having the following composition was prepared, and the ink composition was applied and dried on the release layer 40 so that the film thickness of the adhesive layer 50 after drying was 1.0 μm.
[Ink for adhesive layer-1]
-Dianar (registered trademark) BR-83
(Acrylic resin, Mw = 40,000, Mitsubishi Chemical Corporation) 100 parts, methyl ethyl ketone 900 parts

(Example 2)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the peeling layer ink was changed to the following.
[Ink for release layer-2]
・ Dianal (registered trademark) BR-50
(Styrene acrylic resin, Mw = 65000, Mitsubishi Chemical Corporation) 50 copies, Dianal (registered trademark) BR-75
(Acrylic resin, Mw = 85000, Mitsubishi Chemical Corporation) 48 copies, Elitel (registered trademark) UE-9900
(Polyester resin, Mn = 15000, Unitika Ltd.) 2 parts, 900 parts of toluene

(Example 3)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the compositions of the peeling layer ink and the adhesive layer ink were changed to the following.
[Ink for release layer-3]
-Dianar (registered trademark) BR-52
(Styrene acrylic resin, Mw = 85000, Mitsubishi Chemical Corporation) 98 copies, Elitel (registered trademark) UE-9900
(Polyester resin, Mn = 15000, Unitika Ltd.) 2 parts, 900 parts of toluene [Ink for adhesive layer-2]
-Dianar (registered trademark) BR-75
(Acrylic resin, Mw = 85000, Mitsubishi Chemical Corporation) 100 parts, methyl ethyl ketone 900 parts

(Example 4)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the peeling layer ink was changed to the following.
[Ink for release layer-4]
・ Dianal (registered trademark) BR-50
(Styrene acrylic resin, Mw = 65000, Mitsubishi Chemical Corporation) 93 copies, Elitel (registered trademark) UE-9900
(Polyester resin, Mn = 15000, Unitika Ltd.) 7 parts, 900 parts of toluene

(Comparative Example 1)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the peeling layer ink was changed to the following.
[Ink for release layer-5]
・ Dianal (registered trademark) BR-50
(Styrene acrylic resin, Mw = 65000, Mitsubishi Chemical Corporation) 100 parts, 900 parts of toluene

(Comparative Example 2)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the peeling layer ink was changed to the following.
[Ink for release layer-6]
・ Dianal (registered trademark) BR-50
(Styrene acrylic resin, Mw = 65000, Mitsubishi Chemical Corporation) 30 copies, Dianal (registered trademark) BR-75
(Acrylic resin, Mw = 85000, Mitsubishi Chemical Corporation) 68 copies, Elitel (registered trademark) UE-9900
(Polyester resin, Mn = 15000, Unitika Ltd.) 2 parts, 900 parts of toluene

(Comparative Example 3)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the peeling layer ink was changed to the following.
[Ink for release layer-7]
-Dianar (registered trademark) BR-122
(Styrene acrylic resin, Mw = 210000, Mitsubishi Chemical Corporation) 98 copies, Elitel (registered trademark) UE-9900
(Polyester resin, Mn = 15000, Unitika Ltd.) 2 parts, 900 parts of toluene

(Comparative Example 4)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the ink for the adhesive layer was changed to the following.
[Ink for adhesive layer-3]
-Dianar (registered trademark) BR-82
(Acrylic resin, Mw = 15000, Mitsubishi Chemical Corporation) 100 parts, methyl ethyl ketone 900 parts

(Comparative Example 5)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the film thickness of the release layer 40 after drying of the release layer ink was changed to 0.8 μm.

(Comparative Example 6)
A protective layer thermal transfer sheet was produced in the same manner as in Example 1 except that the film thickness of the release layer 40 after drying of the release layer ink was changed to 0.2 μm.

<Creation of thermal transfer image receiving sheet>
A 188 μm white foamed polyethylene terephthalate film is used as a base material, and an image receiving layer coating liquid having the following composition is applied to one surface thereof by a gravure coating method so that the coating amount after drying is 5.0 g / m ² . A thermal transfer image receiving sheet was prepared by applying and drying.

<Image receiving layer coating liquid>
・ 100 parts of vinyl chloride-vinyl acetate-vinyl alcohol copolymer ・ 3 parts of polyether-modified silicone oil ・ 200 parts of toluene ・ 200 parts of methyl ethyl ketone

<Evaluation of thermal transfer protective sheet>
The obtained thermal transferable protective sheet was evaluated for adhesion in cold weather. The detailed evaluation method is described below.
<Adhesion when cold>
A cellophane tape (registered trademark), which is an adhesive tape, is attached to the surface of the protective layer thermal transfer sheet of Examples 1 to 4 and Comparative Examples 1 to 6, and the attached cellophane tape (registered trademark) is peeled off to form a base of the protective layer thermal transfer sheet. The cold adhesion between the material and the release layer was confirmed. The evaluation was performed according to the following criteria.
〇: The peeling layer does not peel off from the base material ×: The peeling layer peels off from the base material

<Making imprints>
FUJIFILM Thermal Photo Printer ASK-300 thermal transfer sheet and thermal transfer image receiving sheet are superposed, and the resolution is 300 x 300 DPI, the printing speed is 10 msec / line, and the thermal energy of transfer is 0.40 mJ / dot, respectively. A solid black print (without protective layer transfer) was produced by a printer. Subsequently, the protective layer thermal transfer sheets produced in Examples 1 to 4 and Comparative Examples 1 to 6 were superposed on a solid black printed matter, and the resolution was 300 × 300 DPI, the printing speed was 10 msec / line, and the thermal energy of the transfer was transferred. Each was 0.40 mJ / dot, and a black solid printed matter with a protective layer was produced by a thermal printer for evaluation.

<Evaluation of printed matter>
The obtained printed matter was evaluated for foil breakability, glossiness, and rainbow unevenness. The detailed evaluation method for each evaluation item is described below.

<Foil breakability>
The foil breakability of the printed matter produced by using the protective layer thermal transfer sheet and the thermal transfer image receiving sheet of Examples 1 to 4 and Comparative Examples 1 to 6 was measured by the following apparatus. The evaluation was performed according to the following criteria.
・ KEYENCE Digital Microscope VHX-1000
〇: The maximum length of the protective layer foil on the end face of the imprint is less than 80 μm Δ: The maximum length of the protective layer foil on the end face of the imprint is less than 110 μm ×: The maximum length of the protective layer foil on the end face of the imprint It is 100 μm or more. In addition, Δ or more is a level that does not cause any practical problem.

<Gloss evaluation>
The glossiness of the black solid printed matter produced by using the protective layer thermal transfer sheet and the thermal transfer image receiving sheet of Examples 1 to 4 and Comparative Examples 1 to 6 was measured by the following apparatus. The evaluation was performed according to the following criteria.
-Glossiness meter (Rhopoint IQ, manufactured by Rhopoint Instruments) Angle: 60 °
〇: Glossiness is 90% or more Δ: Glossiness is 85% or more and less than 90% ×: Glossiness is less than 85% Note that Δ or more is a level that does not cause any practical problem.

<Rainbow unevenness>
The black solid printed matter prepared by using the protective layer thermal transfer sheet and the thermal transfer image receiving sheet of Examples 1 to 4 and Comparative Examples 1 to 6 was visually inspected under a fluorescent lamp to confirm the presence or absence of rainbow unevenness on the surface. The evaluation was performed according to the following criteria.
〇: No rainbow unevenness is observed ×: Rainbow unevenness is observed Table 1 shows the evaluation results.

As can be seen from the results shown in Table 1, in Examples 1 to 4, the cold adhesion is 〇, the foil breakability is 〇 or Δ, the glossiness is 〇 or Δ, and the rainbow unevenness is 〇. became.

Although the preferred embodiment and each embodiment of the present invention have been described above, the present invention is not limited to this embodiment and each embodiment. It is possible to add, omit, replace, and make other changes to the configuration without departing from the spirit of the present invention.
Further, the present invention is not limited by the above description, but is limited only by the appended claims.

1,1A thermal transfer sheet, 10 base material, 10a first surface, 10a surface, 10b second surface, 20 heat-resistant slipping layer, 30 thermal transfer protective layer, 40 peeling layer, 50 adhesive layer, 60 ink layer

Claims (5)

With the base material
A heat-resistant slipping layer formed on the first surface of the base material,
A thermal transferable protective layer formed on a second surface opposite to the first surface of the substrate is provided.
The thermal transferable protective layer is
The peeling layer formed on the second surface of the base material and
It has an adhesive layer formed on the peeling layer and
The release layer contains at least a polyester resin and a styrene acrylic resin having a weight average molecular weight of 90,000 or less as a main component, and has a film thickness of 0.3 μm to 0.7 μm.
A thermal transfer sheet, wherein the adhesive layer contains a resin other than a styrene acrylic resin having a weight average molecular weight of 90,000 or less as a main component. The thermal transfer sheet according to claim 1, wherein the polyester resin in the release layer has a solid content weight ratio of 1% to 5%. The thermal transfer sheet according to claim 1 or 2, wherein the styrene acrylic resin in the release layer has a weight average molecular weight of 30,000 to 70,000. The thermal transfer sheet according to any one of claims 1 to 3, wherein the weight average molecular weight of the resin as the main component of the adhesive layer is 30,000 to 70,000. A printed matter characterized in that the surface layer of the printed matter obtained by transferring the thermal transfer sheet according to any one of claims 1 to 4 is the peeling layer.

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