JP2020163775A - Thermal transfer sheet, combination of thermal transfer sheet and protective layer transfer sheet, and method for manufacturing printed matter - Google Patents

Abstract

To provide a thermal transfer sheet which can effectively prevent occurrence of transfer failure, and has high foil cutting property, and a combination of a thermal transfer sheet and a protective layer transfer sheet.SOLUTION: A thermal transfer sheet includes a base material, and a coloring layer containing a coloring material and a resin material, a first protective layer and a second protective layer sequentially arranged on the base material, in which thicknesses of the first protective layer and the second protective layer are 7.5 μm or less, and an absolute value of a difference between the thickness (μm) of the coloring layer and the thickness (μm) of the first protective layer is 5 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a combination of a thermal transfer sheet, a thermal transfer sheet and a protective layer transfer sheet, and a method for producing a printed matter.

Conventionally, energy is applied to a heat transfer sheet provided with a base material such as a resin film and a coloring layer containing a coloring material by using a thermal head or the like, and the energy is applied onto an object to be transferred such as paper or a plastic sheet. A heat-melt transfer method is known in which a printed matter is produced by transferring a colored layer and forming an image.
Since the image formed by the thermal melt transfer method has high density and excellent sharpness, this method is suitable for recording binary images such as characters and line art. Further, according to the thermal melt transfer method, variable information such as address, customer information, numbering, and bar code can be recorded on the transferred object by using a computer and a thermal transfer printer.

In the production of such a photographic paper, it is difficult to obtain a high image density depending on the color of the image to be formed. ) Needed to be made thicker than usual.

By the way, the protective layer is transferred onto the formed image for the purpose of improving its durability. However, when the protective layer is to be transferred onto the thick colored layer, the base material and the colored layer are transferred. As a result of air being contained between the transferred protective layer and the step in the step portion (peripheral portion of the colored layer) caused by the above, transfer defects such as fogging of the protective layer and poor adhesion are likely to occur. , The improvement was required.
Further, usually, such a protective layer is required to have a high foil breakability that does not cause tailing or the like when peeled from the base material. Note that tailing means that when the protective layer is transferred onto the transfer material, the protective layer is transferred so as to start from the boundary between the transfer region and the non-transfer region of the protective layer and protrude from this boundary to the non-transfer region. It means a phenomenon that ends up.

The present invention has been made in view of the above problems, and the problem to be solved is a thermal transfer sheet, a thermal transfer sheet and a protective layer transfer, which can effectively prevent the occurrence of transfer defects and have high foil breakability. It is to provide a combination of sheets. Further, the problem to be solved is to provide a method for manufacturing a printed matter using these.

The thermal transfer sheet of the present invention includes a base material, a coloring layer containing a coloring material and a resin material in a surface-sequential manner, a first protective layer, and a second protective layer on the base material.
The thickness of the first protective layer and the second protective layer is 7.5 μm or less.
The absolute value of the difference between the thickness of the colored layer (μm) and the thickness of the first protective layer (μm) is 5 or less.

In one embodiment, the thickness of the first protective layer is 1 μm or more and 6 μm or less.

In one embodiment, the thickness of the second protective layer is 1 μm or more and 6 μm or less.

In one embodiment, the first protective layer and the second protective layer include a release layer and an adhesive layer.

In one embodiment, the first protective layer comprises a polyester having a number average molecular weight of 3000 or more and 12000 or less.

In one embodiment, the second protective layer comprises a polyester having a number average molecular weight of 18,000 or more and 30,000 or less.

The combination of the thermal transfer sheet and the protective layer transfer sheet of the present invention comprises a thermal transfer sheet including a first substrate, a colored layer containing a pigment and a resin material, a second substrate, and a surface on the second substrate. A combination of protective layer transfer sheets including a first protective layer and a second protective layer in sequence.
The thickness of the first protective layer and the second protective layer is 7.5 μm or less.
The absolute value of the difference between the thickness of the colored layer (μm) and the thickness of the first protective layer (μm) is 5 or less.

The method for producing a printed matter of the present invention is a method for producing a printed matter using the thermal transfer sheet or a combination of the thermal transfer sheet and the protective layer transfer sheet.
The process of transferring the colored layer onto the transfer target,
The step of transferring the first protective layer to the region where the colored layer of the transferred body is not transferred, and
It is characterized by including a step of transferring a second protective layer onto the colored layer and the first protective layer.

According to the present invention, the occurrence of transfer defects such as fogging of the protective layer and poor adhesion can be effectively prevented, and the thermal transfer sheet has high foil breakability, and the combination of the thermal transfer sheet and the protective layer transfer sheet. Can be provided.
Further, according to the present invention, it is possible to provide a method for producing a printed matter using these.

It is a schematic sectional drawing which shows one Embodiment of a thermal transfer sheet. It is a schematic sectional drawing which shows one Embodiment of a thermal transfer sheet. It is a schematic sectional drawing which shows one Embodiment of a thermal transfer sheet. It is the schematic sectional drawing which shows one Embodiment of the combination of the thermal transfer sheet and the protective layer transfer sheet. It is the schematic sectional drawing which shows one Embodiment of the combination of the thermal transfer sheet and the protective layer transfer sheet.

(Thermal transfer sheet)
As shown in FIG. 1, the thermal transfer sheet 10 of the present invention includes a base material 11 and a colored layer 12, a first protective layer 13 and a second protective layer 14 on the base material 11 in order of surface.
In one embodiment, as shown in FIG. 2, the first protective layer 13 and the second protective layer 14 include an adhesive layer 15.
In one embodiment, as shown in FIG. 3, the first protective layer 13 and the second protective layer 14 include a release layer 16 and an adhesive layer 15.
Further, in one embodiment, the protective layer 13 may include an arbitrary layer (not shown) between the release layer 15 and the adhesive layer 14.
Further, in one embodiment, as shown in FIGS. 1 to 3, the thermal transfer sheet 10 further includes a back surface layer 17 on a surface opposite to the surface of the base material 11 provided with the colored layer 12.

Hereinafter, each layer included in the thermal transfer sheet according to the present invention will be described.

(Base material)
The base material has heat resistance that can withstand the heat energy applied during thermal transfer (for example, heat from a thermal head), and has mechanical strength and solvent resistance that can support a colored layer or the like provided on the base material. If there is, it can be used without any particular restrictions.

As the base material, for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), 1,4-polycyclohexylene methylene terephthalate, terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer, etc. Polyester, Polyester such as Nylon 6 and Nylon 6,6, Polyethylene (PE), Polyethylene (PP) and Polyethylene such as Polymethylpentene, Polyvinyl chloride, Polyvinyl alcohol (PVA), Polyvinyl acetate, Vinyl chloride-Vinyl acetate Copolymers, vinyl resins such as polyvinyl butyral and polyvinylpyrrolidone (PVP), (meth) acrylic resins such as polyacrylate, polymethacrylate and polymethylmethacrylate, imide resins such as polyimide and polyetherimide, cellophane, cellulose acetate , Nitrocellulose, cellulose resins such as cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB), styrene resins such as polystyrene (PS), polycarbonates, ionomer resins and the like (hereinafter, simply ""Resinfilm") can be used.
Among the above-mentioned resins, polyesters such as PET and PEN are preferable, and PET is particularly preferable, from the viewpoint of heat resistance and mechanical strength.
In the present invention, "(meth) acrylic" means to include both "acrylic" and "methacrylic". Further, "(meth) acrylate" means to include both "acrate" and "metaaclate".

Further, the above-mentioned laminated body of the resin film can be used as a base material. The laminate of the resin film can be produced by using a dry lamination method, a wet lamination method, an extraction method, or the like.

When the base material is a resin film, the resin film may be a stretched film or an unstretched film, but from the viewpoint of strength, the stretched film stretched in the uniaxial direction or the biaxial direction is used. preferable.

The thickness of the base material is preferably 2 μm or more and 25 μm or less, and more preferably 3 μm or more and 10 μm or less. As a result, the mechanical strength of the base material and the transfer of thermal energy during thermal transfer can be improved.

(Colored layer)
The coloring layer contains a coloring material, and the coloring material may be a dye or a pigment.
Coloring materials include red colorants such as cadmium red, cadmium red, chrome red, vermilion, red iron oxide, azo pigments, alizarin lake, quinacridone, and cochineal lake perylene, yellow ocher, aureolin, cadmium yellow, cadmium orange, and chrome yellow. , Zink yellow, Naples yellow, Nickel yellow, Azo pigment, Greenish yellow and other yellow colorants, Ultramarine, Rocks blue, Cobalt, Phthalocyanine, Anthracinone, Indicoid and other blue colorants, Cinavar green, Cadmium green , Green colorants such as chrome green, phthalocyanine, azomethine, perylene, black colorants such as carbon black, white colorants such as silica, calcium carbonate and titanium oxide, metal colorants such as aluminum pigments, and zinc sulfide. , Fluorescent colorants such as zinc silicate and strontium sulfide and the like.

The content of the coloring material in the coloring layer is not particularly limited, and can be, for example, 50% by mass or more and 90% by mass or less.

Examples of the resin material include polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polyol resin, polycarbonate, and ionomer resin. The colored layer can contain two or more of these resin materials.
Among these, the white layer preferably contains (meth) acrylic resin as the main resin material. As a result, the dispersion stability of the coloring material in the coating liquid for forming the colored layer can be improved, and the occurrence of coating defects and the like can be prevented.
In the present invention, the main resin material refers to a resin material that occupies 70 parts by mass or more with respect to 100 parts by mass of the total amount of the resin material contained in the colored layer.

Further, from the viewpoint of improving the adhesiveness to the transferred body, the colored layer preferably contains a vinyl resin, and particularly preferably contains a vinyl chloride-vinyl acetate copolymer.
The content of the vinyl resin in the colored layer is preferably 0.3% by mass or more and 10% by mass or less, and more preferably 1% by mass or more and 5% by mass or less. As a result, the adhesion to the transferred body can be further improved while maintaining the transferability of the colored layer.

Further, from the viewpoint of improving the adhesion to the base material, the colored layer preferably contains polyester.
The content of polyester in the colored layer is preferably 0.03% by mass or more and 1% by mass or less, and more preferably 0.1% by mass or more and 0.5% by mass or less. As a result, the adhesion to the base material can be further improved while maintaining the transferability of the colored layer.

The content of the resin material in the colored layer is preferably 10% by mass or more and 50% by mass or less, and more preferably 10% by mass or more and 35% by mass or less.

As long as the characteristics of the present invention are not impaired, the colored layer may contain additives such as fillers, plastic materials, antistatic materials, ultraviolet absorbers, inorganic particles, organic particles, mold release materials and dispersants.

The thickness of the colored layer is preferably 1 μm or more and 10 μm or less, and more preferably 3 μm or more and 8 μm or less. As a result, the image density formed can be increased while maintaining the transferability of the colored layer.

The colored layer is formed by dispersing or dissolving the above material in water or an appropriate solvent and using known means such as a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method and a rod coating method. , A coating film is formed by applying it on a substrate or the like, and this can be formed by drying.

(1st protective layer and 2nd protective layer)
The thermal transfer sheet of the present invention includes a first protective layer and a second protective layer in a surface-sequential manner. The materials, thicknesses, and the like constituting the first protective layer and the second protective layer may be the same or different.

In one embodiment, the first protective layer and the second protective layer included in the thermal transfer sheet of the present invention include an adhesive layer. Further, in one embodiment, the first protective layer and the second protective layer include a release layer and an adhesive layer.

Further, in the thermal transfer sheet of the present invention, the absolute value of the difference between the thickness of the colored layer (μm) and the thickness of the first protective layer (μm) is 5 or less, more preferably 3 or less. 2, 2 or less is more preferable. As a result, it is possible to effectively prevent the occurrence of transfer defects during transfer of the second protective layer.

The thickness of the first protective layer is preferably 1 μm or more and 6 μm or less, more preferably 1.5 μm or more and 5.5 μm or less, and further preferably 1.5 μm or more and 2.5 μm or less. As a result, it is possible to effectively prevent the occurrence of transfer defects during transfer of the second protective layer while maintaining the foil breakability.

The thickness of the second protective layer is preferably 1 μm or more and 6 μm or less, and more preferably 1.5 m or more and 5.5 μm or less. As a result, the durability of the second protective layer can be improved while maintaining the foil breakability.

(Adhesive layer)
In one embodiment, the first protective layer and the second protective layer included in the thermal transfer sheet of the present invention include an adhesive layer. The adhesive layer is a layer provided on the outermost surface of the protective layer, and contains at least one type of thermoplastic resin that is softened by heating and exhibits adhesion.
Examples of the thermoplastic resin include polyester, ethylene-vinyl acetate copolymer, vinyl chloride resin such as vinyl chloride-vinyl acetate copolymer, (meth) acrylic resin, (meth) acrylic resin, polyurethane, cellulose resin, and polyamide. Examples thereof include polyolefins, styrene resins and chlorinated resins thereof.
Among these, polyester is preferable from the viewpoint of the protective layer foil breakability.

The first protective layer is transferred to the non-transferred region of the colored layer of the transferred body, and the image formed by the colored layer also includes a fine pattern image such as a barcode image, so that high foil breakability is required. To. From such a viewpoint, the adhesive layer provided in the first protective layer preferably contains a polyester having a number average molecular weight (Mn) of 3000 or more and 12000 or less, and more preferably contains a polyester having a Mn of 4000 or more and 10000 or less.
Further, the second protective layer is basically provided so as to completely cover the colored layer and the first protective layer transferred to the transferred body. From such a viewpoint, the adhesive layer provided in the second protective layer preferably contains a polyester having a Mn of 18,000 or more and 30,000 or less, and more preferably contains a polyester having a Mn of 20,000 or more and 25,000 or less.
In the present invention, Mn is a value obtained in terms of polystyrene by gel permeation chromatography (GPC) in accordance with JIS K 7252-1 (issued in 2008).

The glass transition temperature (Tg) of polyester is preferably 45 ° C. or higher and 70 ° C. or lower, and more preferably 58 ° C. or higher and 68 ° C. or lower. As a result, the transferability of the protective layer onto the colored layer can be further improved, and the durability of the protective layer can be further improved. In particular, it is preferable that the polyester having Tg in the above numerical range is contained in the second protective layer.
In the present invention, Tg is a value obtained by differential scanning calorimetry (DSC) in accordance with JIS K 7121.

The content of the thermoplastic resin in the adhesive layer is preferably 50% by mass or more and 100% by mass or less, and more preferably 80% by mass or more and 100% by mass or less. As a result, the foil breakability of the protective layer on the colored layer can be further improved, and the durability of the protective layer can be further improved.

In one embodiment, the adhesive layer contains a filler, which can improve the blocking resistance of the thermal transfer sheet. As the filler, any of an organic filler, an inorganic filler and an organic-inorganic hybrid type filler can be used, and these may be used in combination.

Examples of the organic filler include particles containing a resin material such as (meth) acrylic resin, polyamide, fluororesin, polyolefin, and silicone resin.
Inorganic particles include particles containing metal oxides such as titanium oxide, calcium carbonate and silica.

By using titanium oxide or calcium carbonate as a filler, the image density of the printed matter can be further improved when a white colorant such as titanium oxide is used as the colorant to be contained in the color layer.

The adhesive layer can contain the above-mentioned additives as long as the characteristics of the present invention are not impaired.

The thickness of the adhesive layer is preferably 0.5 μm or more and 5 μm or less, and more preferably 1 μm or more and 4 μm or less. As a result, the foil breakability can be further improved and the durability of the protective layer can be further improved.

The adhesive layer is formed by dispersing or dissolving the above material in water or an appropriate solvent, and using known means such as a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method and a rod coating method. , It can be formed by applying it on a base material or a release layer to form a coating film and drying it.

(Peeling layer)
In one embodiment, the first protective layer and the second protective layer included in the thermal transfer sheet of the present invention include a release layer at a position closest to the base material. As a result, the foil breakability of the protective layer can be further improved.

In one embodiment, the release layer may contain wax as a main constituent. Examples of the wax include natural waxes such as beeswax, whale wax, wood wax, rice bran wax, carnauba wax, candelilla wax and montan wax, paraffin wax, microcrystallin wax, oxide wax, ozokerite, selecin, ester wax and polyethylene wax. Higher saturated fatty acids such as synthetic wax, margaric acid, lauric acid, myristic acid, palmitic acid, stearic acid, floic acid and behenic acid, higher saturated monovalent alcohols such as stearyl alcohol and behenyl alcohol, and higher esters such as sorbitan fatty acid ester. , Higher fatty acid amides such as stearate amides and oleic acid amides. Among these, carnauba wax is preferable from the viewpoint of foil breakability of the protective layer.
The release layer may contain two or more types of wax.

The wax content in the release layer is preferably 70% by mass or more and 99% by mass or less, and more preferably 80% by mass or more and 98% by mass or less. As a result, the foil breakability of the protective layer can be further improved.

Further, in one embodiment, the release layer may contain a resin material as a main constituent component. Since the release layer contains a resin material as a main constituent component, the scratch resistance of the printed matter can be further improved. Examples of the resin material include (meth) acrylic resin, cellulose resin, vinyl resin, polyurethane, silicone resin, fluororesin and the like.

The content of the resin material in the release layer is preferably 70% by mass or more and 99% by mass or less, and more preferably 80% by mass or more and 98% by mass or less. As a result, the scratch resistance of the printed matter can be further improved while maintaining the foil breakability of the protective layer.

The release layer may contain the above-mentioned additive as long as the characteristics of the present invention are not impaired.

The thickness of the release layer is preferably 0.1 μm or more and 3.0 μm or less, and more preferably 0.2 μm or more and 2.0 μm or less. As a result, the foil breakability of the protective layer can be further improved.

The release layer is formed by dispersing or dissolving the above material in water or an appropriate solvent, and known such as roll coating method, reverse roll coating method, gravure coating method, reverse gravure coating method, bar coating method and rod coating method. By means, it can be formed by applying it on a substrate or the like to form a coating film and drying it.

(Back layer)
In one embodiment, the thermal transfer sheet of the present invention includes a back layer on the surface of a base material that is not provided with a colored layer. This makes it possible to prevent sticking and wrinkles due to heating during thermal transfer.

In one embodiment, the back layer contains a resin material, and examples thereof include cellulose resin, styrene resin, vinyl resin, polyester, polyurethane, silicone-modified polyurethane, fluorine-modified polyurethane, and (meth) acrylic resin.

In one embodiment, the back layer comprises inorganic or organic particles. This makes it possible to further prevent sticking and wrinkles due to heating during thermal transfer.
Examples of the inorganic particles include clay minerals such as talc and kaolin, carbonates such as calcium carbonate and magnesium carbonate, hydroxides such as aluminum hydroxide and magnesium hydroxide, sulfates such as calcium sulfate, and oxides such as silica. , Graphite, sulphate, and inorganic particles such as boron hydroxide. As the organic particles, organic resin particles made of (meth) acrylic resin, Teflon (registered trademark) resin, silicone resin, lauroyl resin, phenol resin, acetal resin, styrene resin, polyamide and the like, or these are reacted with a cross-linking material. Examples thereof include crosslinked resin particles that have been formed.

The thickness of the back layer is preferably 0.01 μm or more and 5.0 μm or less, and more preferably 0.03 μm or more and 2 μm or less. As a result, it is possible to prevent sticking, wrinkles, etc. while maintaining the transmissibility of thermal energy during thermal transfer.

The back layer is formed by dispersing or dissolving the above material in water or a suitable solvent and using known means such as a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method and a rod coating method. , It can be formed by applying it on a substrate to form a coating film and drying it.

(Combination of thermal transfer sheet and protective layer transfer sheet)
As shown in FIG. 4, the combination of the thermal transfer sheet and the protective layer transfer sheet of the present invention includes the thermal transfer sheet 20 including the first base material 21 and the colored layer 22, the second base material 31, and the first protective layer. It is a combination with the protective layer transfer sheet 30 including 32 and the second protective layer 33.
In one embodiment, the protective layer 32 includes a release layer 34 and an adhesive layer 35, as shown in FIG.
Further, in one embodiment, as shown in FIGS. 4 and 5, the thermal transfer sheet 20 further includes a back surface layer 23 on a surface opposite to the surface of the first base material 21 provided with the colored layer 22.
Further, in one embodiment, as shown in FIGS. 4 and 5, the protective layer transfer sheet 30 further includes a back surface layer 36 on the surface of the second base material 31 opposite to the surface on which the protective layer 32 is provided. ..

As the first base material included in the thermal transfer sheet and the second base material included in the protective layer transfer sheet, the same base materials as those provided in the thermal transfer sheet can be used.
Further, preferred embodiments of the colored layer included in the thermal transfer sheet, the first protective layer and the second protective layer included in the protective layer transfer sheet, and the like are the same as those of the thermal transfer sheet, and thus the description thereof will be omitted here.

(Manufacturing method of photographic paper)
The method for producing a printed matter of the present invention uses the above-mentioned thermal transfer sheet or a combination of the above-mentioned thermal transfer sheet and the protective layer transfer sheet on the transferred body, and is a step of transferring the colored layer onto the transferred body. It is characterized by including a step of transferring the first protective layer to a region where the colored layer of the transferred body is not transferred, and a step of transferring the second protective layer on the colored layer and the first protective layer. ..

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1
A PET film having a thickness of 4.5 μm was prepared, and a colored layer having the following composition was applied to one surface of the PET film and dried to form a colored layer having a thickness of 5 μm.
<Coating liquid for forming a colored layer>
-White pigment 89 parts by mass (titanium oxide, manufactured by Ishihara Sangyo Co., Ltd., R-780)
-(Meta) acrylic resin 9.9 parts by mass (manufactured by Mitsubishi Chemical Corporation, Dianal (registered trademark) BR-87)
-Vinyl chloride-vinyl acetate copolymer 0.99 parts by mass (manufactured by Nissin Chemical Industry Co., Ltd., Solveine (registered trademark) CNL)
-0.01 parts by mass of polyester (manufactured by Toyobo Co., Ltd., Byron (registered trademark) 200, Tg67 ° C, Mn17000)
・ Methyl ethyl ketone (MEK) 100 parts by mass ・ Toluene 100 parts by weight

A coating liquid for forming a release layer having the following composition is applied onto a PET film and dried so as to be surface-sequential with the colored layer to form a release layer having a thickness of 1 μm, and the following composition is applied on the release layer. The coating liquid for forming an adhesive layer was applied and dried to form an adhesive layer having a thickness of 1 μm, and a first protective layer having a thickness of 2 μm having a release layer and an adhesive layer was formed.
<Coating liquid for forming a release layer>
20 parts by mass of (meth) acrylic resin (Soken Chemical Co., Ltd., Thermolac LP-45M-30, Tg 105 ° C)
・ MEK 80 parts by mass <Coating liquid for forming an adhesive layer>
20 parts by mass of polyester A (manufactured by Toyobo Co., Ltd., Byron (registered trademark) 226, Tg65 ° C, Mn8000)
・ 40 parts by mass of MEK ・ 40 parts by weight of toluene

Similar to the above, a peeling layer having a thickness of 1 μm and an adhesive layer having a thickness of 1 μm were formed on the peeling layer so as to be surface-sequential to the first protective layer, and a second protective layer having a thickness of 2 μm was formed.

A coating liquid for forming a back layer having the following composition was applied to the other surface of the PET film and dried to form a back layer having a thickness of 0.1 μm to obtain a thermal transfer sheet.
<Coating liquid for forming the back layer>
-Polyvinyl butyral 2.0 parts by mass (Sekisui Chemical Co., Ltd., Eslek (registered trademark) BX-1)
-Polyisocyanate 9.2 parts by mass (manufactured by DIC Corporation, Burnock (registered trademark) D750)
-Phosphate ester-based surfactant 1.3 parts by mass (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., Prysurf (registered trademark) A208N)
-Talc 0.3 parts by mass (manufactured by Nippon Talc Industry Co., Ltd., Micro Ace (registered trademark) P-3)
・ Toluene 43.6 parts by mass ・ MEK 43.6 parts by mass

Examples 2-8 and Comparative Examples 1-2
Except that at least one of the coloring material contained in the coloring layer, the thickness of the coloring layer, the thickness of the first protective layer, and the thickness of the second protective layer was changed as shown in Table 1, the same as in Example 1. A thermal transfer sheet was prepared in the same manner.
The details of each component in Table 1 are as follows.
-Black colorant: carbon black, manufactured by Mitsubishi Chemical Corporation, MA14
-Fluorescent coloring material: FX-307 manufactured by Shinroihi Co., Ltd.

Example 9
In the formation of the second protective layer, a thermal transfer sheet was produced in the same manner as in Example 1 except that the composition of the coating liquid for forming the adhesive layer was changed as follows.
<Coating liquid for forming an adhesive layer>
20 parts by mass of polyester B (manufactured by Toyobo Co., Ltd., Byron (registered trademark) 270, Tg67 ° C, Mn23000)
・ 40 parts by mass of MEK ・ 40 parts by weight of toluene

Comparative Example 3
Thermal transfer in the same manner as in Example 1 except that the first protective layer was not formed, the thicknesses of the peeling layer and the adhesive layer were changed as shown in Table 1, and a second protective layer having a thickness of 5 μm was formed. A sheet was prepared.

Comparative Example 4
Thermal transfer in the same manner as in Example 1 except that the first protective layer was not formed, the thicknesses of the peeling layer and the adhesive layer were changed as shown in Table 1, and a second protective layer having a thickness of 8 μm was formed. A sheet was prepared.

<< Evaluation of foil breakability of the first protective layer and the second protective layer >>
Using the thermal transfer sheets obtained in the above Examples and Comparative Examples, the colored layer was transferred onto a PVC card (manufactured by Dai Nippon Printing Co., Ltd.), which is the transferee, under the following transfer conditions, and a barcode image was obtained. Formed.
Next, the first protective layer was transferred to a portion where the colored layer of the transferred body was not transferred under the same conditions.
The first protective layer after transfer was visually observed and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Transfer conditions for white layer)
-Thermal head: KEE-57-12GAN2-STA (manufactured by Kyocera Corporation)
-Average resistance value of heating element: 3303 (Ω)
-Main scanning direction print density: 300 (dpi)
-Secondary scanning direction print density: 300 (dpi)
-Print voltage: 18.0 (V)
-Line cycle: 1.5 (msec./line)
-Printing start temperature: 35 (° C)
-Pulse duty ratio: 85 (%)
・ Energy gradation value: 55/255 gradation (evaluation standard)
A: The tail pull is less than 0.5 mm.
B: The tail pull is 0.5 mm or more and less than 2 mm.
NG: The tail pull is 2 mm or more.

As described above, the second protective layer was transferred onto the entire surface of the colored layer and the first protective layer transferred onto the transferred body under the same conditions as described above to obtain a printed matter.
The second protective layer after transfer was visually observed and evaluated based on the above evaluation criteria. The evaluation results are summarized in Table 1.

<< Evaluation of transfer defect prevention >>
The protective layer in the peripheral portion of the colored layer (the step portion generated by the PVC card and the colored layer) of the printed matter obtained in the foil breakability evaluation was visually observed and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
A: No cloudiness was confirmed in the protective layer.
B: Slight cloudiness was confirmed in the protective layer around the colored layer.
NG: Clear cloudiness was confirmed in the protective layer around the colored layer.

<< Durability evaluation >>
For the printed matter obtained in the above foil breakability evaluation, a Taber test (load 500 gf, 60) conforming to ANSI-INCITS322-2002, 5.9 Surface Abrasion using a Taber tester (wear wheel CS-10F). Cycle / min.) Was carried out.
Every 50 cycles, the image density was measured in the same manner as above, and the number of cycles when the density was reduced by 30% as compared with the image density before the start of the Taber test was confirmed and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
A: 350 cycles or more B: 200 cycles or more and less than 350 cycles C: less than 200 cycles

10: Thermal transfer sheet, 11: Substrate, 12: Colored layer, 13: First protective layer, 14: Second protective layer, 15: Adhesive layer, 16: Peeling layer, 17: Back layer, 20: Thermal transfer sheet, 21 : 1st base material, 22: Colored layer, 23: Back layer, 30: Protective layer transfer sheet, 31: 2nd base material, 32: 1st protective layer, 33: 2nd protective layer, 34: Peeling layer, 35 : Adhesive layer, 36: Back layer

Claims (8)

A base material and a coloring layer containing a coloring material and a resin material, a first protective layer, and a second protective layer are provided on the base material in a surface-sequential manner.
The thickness of the first protective layer and the second protective layer is 7.5 μm or less.
A thermal transfer sheet in which the absolute value of the difference between the thickness (μm) of the colored layer and the thickness (μm) of the first protective layer is 5 or less. The thermal transfer sheet according to claim 1, wherein the thickness of the first protective layer is 1 μm or more and 6 μm or less. The thermal transfer sheet according to claim 1 or 2, wherein the thickness of the second protective layer is 1 μm or more and 6 μm or less. The thermal transfer sheet according to any one of claims 1 to 3, wherein the first protective layer and the second protective layer include a release layer and an adhesive layer. The thermal transfer sheet according to any one of claims 1 to 4, wherein the first protective layer contains a polyester having a number average molecular weight of 3000 or more and 12000 or less. The thermal transfer sheet according to any one of claims 1 to 5, wherein the second protective layer contains a polyester having a number average molecular weight of 18,000 or more and 30,000 or less. A thermal transfer sheet including a first base material, a colored layer containing a pigment and a resin material, a second base material, and a first protective layer and a second protective layer are provided on the second base material in a surface-sequential manner. A combination of protective layer transfer sheets
The thickness of the first protective layer and the second protective layer is 7.5 μm or less.
A combination in which the absolute value of the difference between the thickness (μm) of the colored layer and the thickness (μm) of the first protective layer is 5 or less. A method for producing a printed matter using the thermal transfer sheet according to any one of claims 1 to 6, or a combination of the thermal transfer sheet and the protective layer transfer sheet according to claim 7.
The step of transferring the colored layer onto the transfer target and
The step of transferring the first protective layer to the region where the colored layer of the transferred body is not transferred, and
A method for producing a printed matter, which comprises a step of transferring the second protective layer onto the colored layer and the first protective layer.