JP2018171840A - Thermal transfer image-receiving sheet, thermal transfer sheet, coating liquid for receiving layer, method of forming thermal transfer image-receiving sheet, and method of forming printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image-receiving sheet having a receiving layer having excellent releasability from a colorant layer of a thermal transfer sheet.SOLUTION: A thermal transfer image-receiving sheet 200 has a receiving layer 2 provided on one side of a support 51. The receiving layer 2 contains an acrylic resin, and the acrylic resin has an acid value of 2 mgKOH/g or less.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a thermal transfer image receiving sheet, a thermal transfer sheet, a receiving layer coating solution, a thermal transfer image receiving sheet forming method, and a printed matter forming method.

  As a method of forming an image using thermal transfer, a thermal transfer sheet provided with a color material layer containing a sublimation dye on a substrate and a thermal transfer image-receiving sheet provided with a receiving layer on a support are superposed on each other. A sublimation type thermal transfer system is known in which a sublimation dye contained in a color material layer of a thermal transfer sheet is transferred to a receiving layer of the thermal transfer image receiving sheet to form a thermal transfer image. The sublimation thermal transfer system uses a sublimation dye as a color material, so it has excellent halftone reproducibility and gradation, and can clearly represent the original image on the thermal transfer image-receiving sheet. It is applied to color image formation for computers and the like. The image is of a high quality comparable to a silver salt photograph.

  By the way, when forming a thermal transfer image using the sublimation thermal transfer system, if the releasability between the color material layer of the thermal transfer sheet and the receiving layer of the thermal transfer image receiving sheet is low, the color material layer of the thermal transfer sheet is not the thermal transfer image receiving sheet. When the color material layer is peeled off from the receiving layer after it is attached to the receiving layer and the thermal transfer image is formed, peeling noise, poor running, and peeling marks occur, and the quality of the thermal transfer image formed on the receiving layer of the thermal transfer image receiving sheet decreases. This can cause problems. Other than this, abnormal transfer in which the color material layer is stuck to the receiving layer and the color material layer is transferred as a layer, or abnormal transfer in which the receiving layer is stuck to the color material layer and the receiving layer is taken by the color material layer Such problems may occur. Therefore, good releasability is required between the color material layer of the thermal transfer sheet and the receiving layer of the thermal transfer image receiving sheet.

  In order to improve the releasability between the colorant layer and the receiving layer, it is preferable to include a releasing agent in the receiving layer of the thermal transfer image-receiving sheet, and various release agents have been proposed so far. Has been. This release agent is roughly classified into a liquid lubricant and a solid lubricant, and as a liquid lubricant having excellent release properties, for example, silicone oil (see Patent Document 1) is known.

  However, liquid lubricants such as silicone oil have a problem in that it has a large variation range of releasability due to an external environment during thermal transfer image formation, and it is difficult to stably exhibit releasability. On the other hand, waxes such as carnauba wax, paraffin wax, carboxyl group-containing paraffin wax, and carboxyl group-containing polyethylene wax, and known solid lubricants such as fluorine compounds (see Patent Document 2) are externally used during thermal transfer image formation. Although the variation range of releasability due to the environment is small, release agents as solid lubricants have lower releasability compared to liquid lubricants such as the above-mentioned silicone oil, and are improved in fields where high releasability is required There is room for.

JP 2007-90650 A JP 2010-269583 A

  The present invention has been made in such a situation, and provides a thermal transfer image-receiving sheet having a receptive layer having good releasability from a color material layer, a method for forming the thermal transfer image-receiving sheet, and at the time of thermal transfer image formation. Providing a coating solution for a receiving layer that can form a receiving layer with good releasability from the color material layer of the thermal transfer sheet, and thermal transfer having a receiving layer with good releasability from the color material layer It is a main object to provide a thermal transfer sheet capable of forming an image receiving sheet, and to provide a method for forming a print product capable of forming a print product having a high quality thermal transfer image.

  The present invention for solving the above-mentioned problems is a thermal transfer image-receiving sheet provided with a receiving layer on one side of a support, wherein the receiving layer contains an acrylic resin, and the acrylic resin The acid value is 2 mgKOH / g or less.

  In the thermal transfer image receiving sheet, the receiving layer may contain 5% by mass or more of an acrylic resin having an acid value of 2 mgKOH / g or less based on the total mass of the receiving layer.

  In the thermal transfer image receiving sheet, the receiving layer may contain a vinyl chloride-vinyl acetate copolymer.

  Further, the present invention for solving the above problems is a thermal transfer sheet for forming a thermal transfer image receiving sheet having a receiving layer, wherein a transfer layer is provided on one surface of a support, When the transfer layer has a single layer configuration consisting of only a receiving layer or a stacked configuration including a receiving layer, and the transfer layer has a stacked configuration, the receiving layer is closest to the support among the layers constituting the transfer layer. It is located, The said receiving layer contains acrylic resin, The acid value of the said acrylic resin is 2 mgKOH / g or less, It is characterized by the above-mentioned.

  In the thermal transfer sheet, the receiving layer may contain 5% by mass or more of an acrylic resin having an acid value of 2 mgKOH / g or less based on the total mass of the receiving layer.

  In the thermal transfer sheet, the receiving layer may contain a vinyl chloride-vinyl acetate copolymer.

  Further, the present invention for solving the above problems is a receiving layer coating liquid for forming a receiving layer, wherein the receiving layer coating liquid contains an acrylic resin, and The acid value of the resin is 2 mgKOH / g or less.

  Further, the present invention for solving the above problems is a method for forming a thermal transfer image receiving sheet, which is a combination of a thermal transfer sheet having a transfer layer and a transfer target, and the transfer of the thermal transfer sheet onto the transfer target. Including a step of transferring a layer, wherein the thermal transfer sheet is the thermal transfer sheet described above.

  Further, the present invention for solving the above-mentioned problems is a method for forming a printed product, which is a combination of the above-described thermal transfer image receiving sheet and a thermal transfer sheet having a color material layer, and thermal transfer to the receiving layer of the thermal transfer image receiving sheet. The method includes a step of forming an image.

  Further, the present invention for solving the above problems is a method for forming a printed product, which is a combination of a thermal transfer image receiving sheet formed by the above thermal transfer image receiving sheet forming method and a thermal transfer sheet having a color material layer, The method includes a step of forming a thermal transfer image on the receiving layer of the thermal transfer image receiving sheet.

  According to the thermal transfer image receiving sheet of the present invention, the releasability from the color material layer of the thermal transfer sheet at the time of thermal transfer image formation can be improved. Further, according to the method for forming a thermal transfer image receiving sheet of the present invention and the thermal transfer sheet of the present invention, a thermal transfer image receiving sheet having a receptive layer having good releasability from the color material layer of the thermal transfer sheet at the time of thermal transfer image formation is formed. can do. Moreover, according to the receiving layer coating liquid of the present invention, it is possible to form a receiving layer having good releasability from the color material layer of the thermal transfer sheet at the time of thermal transfer image formation. Moreover, according to the method for forming a printed matter of the present invention, a printed matter having a high-quality thermal transfer image can be formed.

It is a schematic sectional drawing which shows an example of the thermal transfer sheet of one Embodiment. It is a schematic sectional drawing which shows an example of the thermal transfer image receiving sheet formed using the thermal transfer sheet of one Embodiment. It is a schematic sectional drawing which shows an example of an intermediate transfer medium. It is a schematic sectional drawing which shows an example of the thermal transfer sheet which has a color material layer. It is a schematic sectional drawing which shows an example of the thermal transfer sheet which concerns on other embodiment. It is a schematic sectional drawing which shows an example of the thermal transfer image receiving sheet of one Embodiment. It is a schematic sectional drawing which shows an example of the thermal transfer image receiving sheet of one Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention can be implemented in many different modes, and is not construed as being limited to the description of the embodiments exemplified below. In addition, the drawings may be schematically represented with respect to the thickness, shape, and the like of each layer as compared to the actual mode for clarity of explanation, but are merely examples and limit the interpretation of the present invention. is not. In addition, in the present specification and each drawing, the same elements as those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

<< Thermal transfer sheet >>
As shown in FIGS. 1A and 1B, a thermal transfer sheet according to an embodiment of the present invention (hereinafter referred to as a thermal transfer sheet of one embodiment) is formed on one surface of a support 1 with a transfer layer. 10, the transfer layer 10 has a single-layer configuration (see FIG. 1 (a)) consisting only of the receiving layer 2 or a laminated configuration including the receiving layer 2 (see FIG. 1 (b)). ing. Further, when the thermal transfer sheet 100 according to one embodiment has a laminated configuration in which the transfer layer 10 includes the receptor layer 2 as shown in FIG. 1B, the receptor layer 2 is a layer constituting the transfer layer 10. Is located closest to the support 1. Drawing 1 (a) and (b) is an outline sectional view showing an example of a thermal transfer sheet of one embodiment.

  As shown in FIG. 2, the thermal transfer sheet 100 according to an embodiment transfers a transfer layer 10 including a receiving layer 2 onto an arbitrary transfer target 301 (hereinafter referred to as a transfer target) and receives the transfer layer 10 on the outermost surface. This is a thermal transfer sheet 100 for forming a thermal transfer image receiving sheet 300 on which the layer 2 is located. FIG. 2 is a schematic cross-sectional view illustrating an example of a thermal transfer image receiving sheet 300 formed using the thermal transfer sheet 100 (see FIG. 1B) according to an embodiment.

  As one of thermal transfer sheets provided with a receiving layer, as shown in FIG. 3, an intermediate transfer in which a transfer layer 10A including a receiving layer 2A located on the outermost surface is provided so as to be transferable (detachable) from a support 401 Medium 400 is known. According to the intermediate transfer medium 400 in which the receiving layer 2A is positioned on the outermost surface, a thermal transfer image can be formed on the receiving layer 2A before the transfer of the receiving layer 2A onto the transfer target. That is, the intermediate transfer medium also serves as a thermal transfer image receiving sheet. Further, after the thermal transfer image is formed on the receiving layer 2A, the receiving layer 2A on which the thermal transfer image is formed is provided on the transferred body by transferring the receiving layer 2A on which the thermal transfer image is formed onto the transferred body. A printed product (not shown) is obtained. 3 has a transfer layer 10A provided on a support 401, and the transfer layer 10A may be referred to as a peeling layer 410 (also referred to as a protective layer) from the support 401 side. A receiving layer 2A is provided in this order.

  As shown in FIG. 1, a thermal transfer sheet 100 according to an embodiment has a receiving layer 2 positioned closest to a support 1 among the layers constituting the transfer layer 10, and the transfer layer 10 is placed on the transfer target. By transferring, the receiving layer 2 can be positioned on the outermost surface. That is, by transferring the transfer layer 10 onto the transfer target 301, as shown in FIG. 2, a thermal transfer image receiving sheet 300 in which the receiving layer 2 is located on the outermost surface can be formed. Then, the formed thermal transfer image receiving sheet 300 is combined with, for example, the thermal transfer sheet 500 having the color material layer 510 shown in FIG. 4, and the color material layer 510 of the thermal transfer sheet 500 is contained in the receiving layer 2 of the thermal transfer image receiving sheet 300. The transferred color material is transferred, so that a thermal transfer image can be formed on the receiving layer 2.

  That is, from the viewpoint that the receiving layer can be transferred, the thermal transfer sheet 100 (see FIG. 1) and the intermediate transfer medium 400 (see FIG. 3) of one embodiment are common, but the transfer layer 10 has a transfer interface. Whether or not it is an essential condition that the receiving layer 2 is located, that is, an essential condition that the receiving layer 2 is located closest to the support among the layers constituting the transfer layer 10. The thermal transfer sheet 100 and the intermediate transfer medium 400 according to the embodiment are different from each other in terms of whether or not the In the field of intermediate transfer media, a plurality of layers including a receiving layer and capable of being transferred from a support may be collectively referred to as a “transfer layer”. Whether or not the “transfer layer” referred to in the thermal transfer sheet and the “transfer layer” referred to in the field of the intermediate transfer medium have an essential condition that the receiving layer 2 is located at the transfer interface of the transfer layer 10. Is clearly different. Hereinafter, each configuration of the thermal transfer sheet 100 of one embodiment will be specifically described.

(Support for thermal transfer sheet)
The support 1 (sometimes referred to as a base material or a sheet) is an essential component of the thermal transfer sheet 100 of one embodiment, and the transfer layer 10 provided on one surface of the support 1 or a support. It is provided to hold an arbitrary layer (for example, an arbitrary release layer described later) provided between the body 1 and the transfer layer 10. The material of the support 1 is not particularly limited, but it is desirable that the transfer layer 10 has mechanical characteristics that can withstand heat applied when transferring the transfer layer 10 onto the transfer target and does not hinder handling. Examples of such support 1 include polyesters such as polyethylene terephthalate, polycarbonate, polyimide, polyetherimide, cellulose derivatives, polyethylene, polypropylene, polystyrene, acrylic, polyvinyl chloride, polyvinylidene chloride, nylon, polyether ether ketone, and the like. Various plastic films or sheets can be mentioned. Further, the thickness of the support 1 can be appropriately set according to the material so that the strength and heat resistance thereof are appropriate, and the range of 2.5 μm to 100 μm is common.

(Transfer layer)
As shown in FIGS. 1A and 1B, a transfer layer 10 is provided on the support 1. The transfer layer 10 is detachable from the support 1 and is a layer that is transferred (transferred) onto the transfer target 301 by thermal transfer (see FIG. 2). The transfer layer 10 has a single layer structure including only the receiving layer 2 or a stacked structure in which two or more layers including the receiving layer 2 are stacked. In the case where the thermal transfer sheet 100 of one embodiment has a laminated structure in which two or more layers including the receiving layer 2 are laminated, the layer constituting the transfer layer 10 is closest to the support 1. It is an essential condition that the layer located is the receiving layer 2. This is because the receiving layer 2 is positioned on the outermost surface of the thermal transfer image receiving sheet 300 (see FIG. 2) formed by transferring the transfer layer 10 including the receiving layer 2 onto the transfer target 301.

(Receptive layer)
The thermal transfer sheet 100 of one embodiment constitutes a transfer layer 10, and the receiving layer 2 located closest to the support 1 among the layers constituting the transfer layer 10 contains an acrylic resin, The acid value of the resin is 2 mgKOH / g or less. Hereinafter, an acrylic resin having an acid value of 2 mgKOH / g or less may be referred to as a “specific acrylic resin”.

  The “acid value” referred to in the present specification means the number of milligrams of potassium hydroxide necessary to neutralize an acid component (for example, carboxyl group) contained in 1 g of a polymer, and JIS-K-2501 ( 2003).

  The term “acrylic resin” used in the present specification refers to a polymer of acrylic acid or methacrylic acid monomer, or a derivative thereof, a polymer of acrylic acid ester or a monomer of methacrylic acid ester, or a derivative thereof, acrylic. It includes a copolymer of an acid or methacrylic acid monomer and another monomer, or a derivative thereof, an acrylate ester, or a copolymer of a monomer of methacrylic acid ester and another monomer, or a derivative thereof.

  As the acrylic resin contained in the receiving layer 2 of the thermal transfer sheet 100 of one embodiment, an acrylic resin having an acid value of 2 mgKOH / g or less may be appropriately selected from these acrylic resins.

  Examples of acrylic acid ester and methacrylic acid ester monomers include alkyl acrylates and alkyl methacrylates. Specifically, methyl acrylate (methyl acrylate), methyl methacrylate (methyl methacrylate), ethyl acrylate (ethyl acrylate), ethyl methacrylate (ethyl methacrylate), butyl acrylate (butyl acrylate), butyl methacrylate (methacrylic acid) Butyl), lauryl acrylate (lauryl acrylate), lauryl methacrylate (lauryl methacrylate), 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 2-hydroxy-3-phenoxy Examples thereof include propyl acrylate and 2-hydroxy-3-phenoxypropyl methacrylate.

  Examples of other monomers include aromatic hydrocarbons, aryl group-containing compounds, amide group-containing compounds, and vinyl chloride, styrene, benzylstyrene, phenoxyethyl methacrylate, acrylamide, and methacrylamide. it can. Further, other monomers may be used.

  In addition, as an acrylic resin, one or more of acrylic acid alkyl esters, 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate Acrylic obtained by copolymerizing one or more of (meth) acrylic acid ester having a hydroxyl group in the molecule, and one or more other polymerizable monomers such as styrene if necessary A polyol resin or the like can also be used.

  According to the receiving layer 2 containing the “specific acrylic resin”, sufficient release properties can be imparted to the receiving layer 2 by the action of the “specific acrylic resin”. Therefore, the thermal transfer image receiving sheet 300 (see FIG. 2) formed using the thermal transfer sheet 100 of one embodiment is combined with the thermal transfer sheet 500 (see FIG. 4) in which the color material layer 510 is provided on the support 501. When the thermal transfer image is formed on the receiving layer 2 of the thermal transfer image receiving sheet 300, the releasability between the receiving layer 2 of the thermal transfer image receiving sheet 300 and the color material layer 510 of the thermal transfer sheet 500 having the color material layer is good. It can be. As a result, for example, when the color material layer is peeled from the receiving layer on which the thermal transfer image is formed, peeling sound, running failure, generation of peeling marks, or the color material layer is stuck to the receiving layer when the thermal transfer image is formed. To suppress abnormal transfer in which the transfer layer is transferred as a layer, abnormal transfer in which the receptor layer is stuck to the color material layer during thermal transfer image formation, and part or all of the receptor layer is taken up by the color material layer And a high-quality thermal transfer image can be formed.

  Further, according to the thermal transfer sheet 100 of one embodiment, the layer located at the transfer interface among the layers constituting the transfer layer 10 is the receiving layer 2 containing “specific acrylic resin”. The transferability when transferring the transfer layer 10 can be sufficiently satisfied. In other words, the thermal transfer sheet 100 according to one embodiment has a good releasability from the color material layer 510 and a transfer target layer to the receiving layer 2 constituting the transfer layer 10 by using a “specific acrylic resin” as a binder resin. It is characterized in that it provides both good transferability when transferring the transfer layer 10 onto the body 301.

  The transferability referred to in this specification means that the transfer layer does not remain on the support side when the transfer layer is transferred to the transfer target side, or the transfer target and the thermal transfer sheet are integrated. The transfer layer is an index indicating whether or not the transfer layer can be accurately transferred (transferred) to the transferred material side. The high transferability means that energy is applied to the thermal transfer sheet on the transferred material. When transferring the transfer layer, the transfer layer corresponding to the area to which energy is applied does not remain on the support side, and the transfer target and the thermal transfer sheet are not integrated with each other. It means that it can be migrated accurately. On the other hand, low transferability means that when energy is applied to the thermal transfer sheet and the transfer layer is transferred to the transfer target side, a part or all of the transfer layer corresponding to the area to which energy is applied In the above, the support or a layer arbitrarily provided on the support (for example, an arbitrary release layer to be described later) and the transfer layer cause heat fusion, in other words, on the support or the support. The layer provided arbitrarily and the receiving layer included in the transfer layer cause heat fusion, the transfer layer cannot be peeled off from the support, and the transfer target and the thermal transfer sheet are integrated, or The support, or a layer arbitrarily provided on the support, and the receiving layer included in the transfer layer cause heat fusion, and originally, the support or any layer provided on the support. The transfer layer to be peeled off at the interface constitutes the transfer layer. It will be peeled off in layers, which means that all of the receiving layer to be transferred onto the transfer receiving material, or part will remain on the support side.

  By containing the above-mentioned “specific acrylic resin”, that is, an acrylic resin having an acid value of 2 mgKOH / g or less in the receiving layer 2, the receiving layer 2 has a good releasability and a good transferability. The mechanism to be imparted is not necessarily clear at present, but according to the receiving layer 2 containing “specific acrylic resin”, the receiving layer containing no “specific acrylic resin”, for example, acid Compared with a receiving layer containing only an acrylic resin with a value exceeding 2 mgKOH / g, or a receiving layer containing only a resin other than an acrylic resin, for example, a receiving layer containing only a vinyl chloride-vinyl acetate copolymer. Thus, the releasability and transferability can be improved. This is also clear from the results of Examples and Comparative Examples described later. In other words, the thermal transfer sheet 100 according to an embodiment includes a “specific acrylic resin” in the receiving layer regardless of the content thereof, so that the thermal transfer sheet 100 can be compared with a receiving layer that does not include the “specific acrylic resin”. Therefore, the mold releasability and transferability are improved.

  The receiving layer 2 may contain 1 type as "specific acrylic resin", and may contain 2 or more types.

  The glass transition temperature (Tg) of the “specific acrylic resin” is preferably 35 ° C. or higher, more preferably 50 ° C. or higher, further preferably 60 ° C. or higher, and 65 ° C. or higher. It is particularly preferred that According to the receiving layer 2 containing the “specific acrylic resin” having a glass transition temperature (Tg) in the above preferred range, the transferability of the transfer layer 10 including the receiving layer 2 can be further improved. In addition, the glass transition temperature (Tg) referred to in the specification of the present application is a temperature determined based on measurement of a change in calorie (DSC method) by DSC (differential scanning calorimetry) in accordance with JIS-K-7121 (2012). means.

  Further, the weight average molecular weight (Mw) of the “specific acrylic resin” is preferably 30,000 or more and 600,000 or less, more preferably 50,000 or more and 600,000 or less, and further preferably 60000 or more and 200,000 or less, It is particularly preferably 60000 or more and 150,000 or less. According to the receiving layer 2 containing the “specific acrylic resin” having a weight average molecular weight (Mw) in the above preferred range, the transferability of the transfer layer 10 including the receiving layer 2 can be further improved. Further, it is possible to further improve the releasability of the color material layer 510 when a thermal transfer image is formed on the receiving layer 2 using the thermal transfer sheet 500 having the color material layer. In addition, the weight average molecular weight (Mw) said by this-application specification means the average molecular weight by polystyrene conversion measured by GPC (gel permeation chromatography) based on JIS-K-7252-1 (2008).

  The receiving layer 2 may contain other components together with the “specific acrylic resin”. Examples of other components include binder resins other than the “specific acrylic resin” and various conventionally known release agents.

  The content of the “specific acrylic resin” when the receiving layer 2 contains other components is not particularly limited, but the mass of the “specific acrylic resin” with respect to the total mass of the receiving layer 2 is 5 masses. % Or more, and more preferably 7.5% by mass or more. By making the content of the “specific acrylic resin” with respect to the total mass of the receiving layer 2 within the above preferred range, it is possible to further improve the releasability and transferability. There is no limitation in particular about an upper limit, and it is 100 mass%.

  Examples of the binder resin other than “specific acrylic resin” include, for example, polyolefin resins such as polypropylene, halogenated resins such as polyvinyl chloride or polyvinylidene chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, A vinyl resin such as ethylene-vinyl acetate copolymer or polyacrylate, a polyester resin such as polyethylene terephthalate or polybutylene terephthalate, a polystyrene resin, a polyamide resin, an olefin such as ethylene or propylene, and another vinyl polymer. Copolymer resin, cellulose resin such as ionomer or cellulose diastase, polycarbonate, acrylic resin having an acid value greater than 2 mgKOH / g, polyvinylpyrrolidone resin, polyvinyl alcohol resin , And the like gelatin. The receiving layer 2 may contain one of these binder resins together with “specific acrylic resin”, and may contain two or more of these binder resins together with “specific acrylic resin”. May be.

  A preferable form of the receiving layer 2 contains a “specific acrylic resin” and a vinyl chloride-vinyl acetate copolymer. According to the thermal transfer sheet 100 of one embodiment having the receptor layer 2 in a preferred form, a thermal transfer image receiver sheet capable of forming a thermal transfer image with a high density on the receptor layer 2 can be obtained.

  The receiving layer 2 in a more preferable form contains a “specific acrylic resin” and a vinyl chloride-vinyl acetate copolymer, and 5% by mass of the “specific acrylic resin” with respect to the total mass of the receiving layer 2. It is contained in the range of 50% by mass or less, more preferably 5% by mass or more and 30% by mass or less, and particularly preferably 5% by mass or more and 10% by mass or less, and 50% by mass of the vinyl chloride-vinyl acetate copolymer. % To 95% by mass. According to the thermal transfer sheet 100 of one embodiment having the receiving layer 2 in a more preferable form, it is possible to further improve the transferability when the transfer layer 10 is transferred onto the transfer target. In addition, in the thermal transfer image receiving sheet formed by the thermal transfer sheet 100 of one embodiment, it is possible to further improve the releasability when forming the thermal transfer image on the receiving layer 2, and the higher density thermal transfer image. Can be formed.

  Conventionally known release agents include, for example, solid waxes such as polyethylene wax, amide wax, Teflon (registered trademark) powder, fluorine-based or phosphate-based surfactant, silicone oil, reactive silicone oil, and curable type. Examples include various modified silicone oils such as silicone oil, and various silicone resins.

  According to the receiving layer 2 containing the “specific acrylic resin” and the release agent, the releasability of the receiving layer 2 can be further improved by the synergistic effect of the “specific acrylic resin” and the release agent. Can be planned.

  As other arbitrary components other than this, various fillers, such as a urethane filler and a silicone filler, various antistatic agents, various mold release agents, etc. can be mentioned, for example.

  Although there is no limitation in particular about content of a mold release agent, it is preferable that it is the range of 5 mass% or more and 20 mass% or less with respect to the total mass of the receiving layer 2. FIG.

  The method for forming the receiving layer 2 is also not particularly limited. For the receiving layer, a “specific acrylic resin”, a binder resin added as necessary, a release agent, etc. are dispersed or dissolved in an appropriate solvent. A coating solution can be prepared, and this coating solution can be formed by coating and drying on the support 1 or an arbitrary layer provided on the support 1 and not constituting the transfer layer 10. Examples of the coating means include a gravure coater, a roll coater, a wire bar, and a screen printer. Also, other coating means can be used. This is the same also about the coating method of the various coating liquid mentioned later. Although there is no limitation in particular about the thickness of the receiving layer 2, the range of 0.1 micrometer or more and 10 micrometers or less is preferable.

(Functional layer)
When the transfer layer 10 has a stacked structure in which two or more layers including the receiving layer 2 are stacked, the function of forming the transfer layer 10 on the receiving layer 2 as shown in FIG. Layer 4 is provided. The functional layer 4 is not particularly limited, and may be appropriately determined according to the function required for the transfer layer 10 or the thermal transfer image receiving sheet 300 formed using the thermal transfer sheet 100 of one embodiment. Note that the functional layer 4 may have a single-layer configuration or a stacked configuration in which two or more layers are stacked.

  The functional layer 4 as an example is an adhesive layer (in the case of being referred to as a heat seal layer) for improving the adhesion between the transfer object and the transfer layer 10 when the transfer layer 10 is transferred onto the transfer object 301. There is also a role. The functional layer 4 as another example serves as a concealing layer for concealing part or all of the surface of the transfer target.

  The adhesive layer as an example of the functional layer 4 contains a material having adhesiveness. Examples of the adhesive material include polyolefin resins such as urethane resins, α-olefin-maleic anhydride resins, polyester resins, acrylic resins, epoxy resins, urea resins, melamine resins, phenolic resins. Examples thereof include a resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer, and a cyanoacrylate resin. Moreover, what hardened these resin with the hardening | curing agent can also be used. As the curing agent, an isocyanate compound is generally used, but aliphatic amines, cycloaliphatic amines, aromatic amines, acid anhydrides and the like can be used.

  There is no limitation in particular about the formation method of the contact bonding layer which is an example of the functional layer 4, The binder resin illustrated above, the ultraviolet absorber added as needed, antioxidant, fluorescent whitening agent, an inorganic or organic filler An adhesive layer coating solution prepared by dispersing or dissolving components, a surfactant, a release agent, etc. in an appropriate solvent is prepared, and this coating solution is formed on the receiving layer 2 by coating and drying. Can do. The thickness of the adhesive layer is preferably in the range of 0.5 μm to 10 μm, and more preferably in the range of 0.8 μm to 2.0 μm.

  In the case where the transfer layer 10 is a transfer layer 10 having a single layer structure composed only of the receiving layer 2 and no measures are taken to improve the adhesion to the transfer layer 10 on the transfer target side. In order to improve the adhesion between the transfer target and the transfer layer 10, it is preferable that the receiving layer 2 contains a “specific acrylic resin” and a material having the above-mentioned adhesive properties.

  The concealing layer as an example of the functional layer 4 contains a binder resin and a colorant. Examples of the binder resin include a polyester resin, a urethane resin, an epoxy resin, a phenol resin, an acrylic resin, and a vinyl chloride-vinyl acetate copolymer. Examples of the colorant include known colorants such as titanium oxide, zinc oxide, carbon black, iron oxide, iron yellow, ultramarine blue, hologram powder, aluminum powder, metallic pigment, and pearl pigment. The concealing layer may contain one kind of these binder resins or may contain two or more kinds. The same applies to the colorant.

  There is no limitation in particular about the formation method of the concealment layer which is an example of the functional layer 4, For the concealment layer which disperse | distributed or melt | dissolved the binder resin illustrated above, the coloring agent, and the additive added as needed in a suitable solvent A coating solution can be prepared, and this coating solution can be formed on the receptor layer 2 by coating and drying. The thickness of the concealing layer is preferably in the range of 0.1 μm to 5 μm.

  In the above description, the adhesive layer and the concealing layer have been described as an example of the functional layer 4, but other layers may be used as the functional layer. Alternatively, the transfer layer 10 may be formed by laminating the receiving layer 2, the concealing layer, and the adhesive layer in this order from the support 1 side.

(Release layer)
A release layer (not shown) can also be provided between the support 1 and the transfer layer 10. The release layer is an arbitrary configuration in the thermal transfer sheet 100 of one embodiment, and is a layer that does not constitute the transfer layer 10. That is, it is a layer remaining on the support 1 side when the transfer layer 10 is transferred onto the transfer target 301. By providing a release layer between the support 1 and the transfer layer 10, the transfer property of the transfer layer 10 can be further improved in combination with the good transfer property of the receiving layer 2 containing “specific acrylic resin”. Can be planned.

  Examples of the binder resin contained in the release layer include waxes, silicone wax, silicone resin, silicone-modified resin, fluorine resin, fluorine-modified resin, polyvinyl alcohol, acrylic resin, heat-crosslinkable epoxy-amino resin, and heat-crosslinking. Alkyd-amino resin and the like. Further, the release layer may be composed of one kind of resin or may be composed of two or more kinds of resins. The release layer may be formed by using a cross-linking agent such as an isocyanate compound, a catalyst such as a tin-based catalyst, and an aluminum-based catalyst in addition to the releasable resin. The thickness of the release layer is generally in the range of 0.2 μm to 5 μm. As a method for forming the release layer, a release layer coating solution in which the above resin is dispersed or dissolved in an appropriate solvent is prepared, and this coating solution is applied to the support 1 and dried. can do.

(Back layer)
In addition, a back layer (not shown) can be provided on the surface of the support 1 opposite to the surface on which the transfer layer 10 is provided. In addition, a back surface layer is arbitrary structures in the thermal transfer sheet 100 of one Embodiment.

  There is no limitation on the material of the back layer, for example, cellulose resins such as cellulose acetate butyrate and cellulose acetate propionate, vinyl resins such as polyvinyl butyral and polyvinyl acetal, polymethyl methacrylate, polyethyl acrylate, polyacrylamide And acrylic resins such as acrylonitrile-styrene copolymers, polyamide resins, polyamideimide resins, polyester resins, polyurethane resins, and natural or synthetic resins such as silicone-modified or fluorine-modified urethane, or a mixture thereof.

  The back layer may contain a solid or liquid lubricant. Examples of the lubricant include various waxes such as polyethylene wax and paraffin wax, higher aliphatic alcohols, organopolysiloxanes, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, fluorine And surfactants, organic carboxylic acids and derivatives thereof, metal soaps, fluorine resins, silicone resins, fine particles of inorganic compounds such as talc and silica. The mass of the lubricant with respect to the total mass of the back layer is in the range of 5 to 50% by mass, preferably in the range of 10 to 40% by mass.

  There is no particular limitation on the method for forming the back layer, and a coating solution for the back layer is prepared by dispersing or dissolving a resin, a lubricant added as necessary, in an appropriate solvent, and this coating solution is supported. It can be formed on the body 1 by coating and drying. The thickness of the back layer is preferably in the range of 1 μm to 10 μm.

(Thermal transfer sheet of other embodiments)
As shown in FIG. 5, the thermal transfer sheet according to another embodiment (hereinafter referred to as the thermal transfer sheet of another embodiment) is formed on one surface of the support 1 with the transfer layer 10 described above, The color material layer 5 is provided in the surface order. That is, the thermal transfer sheet 100A of another embodiment has a configuration in which the color material layer 5 is further provided on one surface of the support 1 in the thermal transfer sheet 100 of the embodiment described above. In addition, in the thermal transfer sheet 100A of another embodiment shown in FIG. 5, the transfer layer 10, the color material layer 5, and a protective layer (not shown) can be provided in the surface order on one surface of the support 1. Further, instead of or in addition to the protective layer, a color material layer (not shown) containing a pigment, an optional special color panel (not shown) composed of a hologram layer, and the like can be provided in the surface order. There is no particular limitation on the order of these layers. In the form shown in FIG. 5, the transfer layer 10 has a laminated structure in which two or more layers including the receiving layer 2 are stacked. However, the transfer layer 10 is a single layer made of only the receiving layer 2. It can also be configured.

  According to the thermal transfer sheet 100A of another embodiment, for example, both the formation of the thermal transfer image receiving sheet 300 as shown in FIG. 2 and the formation of the thermal transfer image on the receiving layer 2 of the formed thermal transfer image receiving sheet 300 are performed. One thermal transfer sheet can be used. Specifically, the thermal transfer image receiving sheet 300 in which the transfer layer 10 is provided on the transfer target 301 is formed by transferring the transfer layer 10 onto the transfer target using the thermal transfer sheet 100A of another embodiment. can do. Further, by transferring the color material contained in the color material layer 5 of the thermal transfer sheet 100A of another embodiment onto the receiving layer 2 positioned on the outermost surface of the thermal transfer image receiving sheet 300, a thermal transfer image can be formed. .

  Hereinafter, each configuration of the thermal transfer sheet 100A of another embodiment will be described focusing on differences from the thermal transfer sheet 100 of one embodiment. Unless otherwise specified, the one described in the thermal transfer sheet 100 of the above embodiment can be used as it is.

(Color material layer)
The color material layer 5 as an example contains a sublimable dye as a color material and a binder resin. The color material layer 5 may be formed of only one color layer appropriately selected when the desired image is monocolor, or yellow sublimation dye when the desired image is a full color image. A plurality of colorant layers containing sublimation dyes having different hues, such as a magenta sublimation dye and a cyan sublimation dye, may be repeatedly formed on the same surface of the support 501 in the surface order. In addition, the color material layer 5 is not limited to what is demonstrated below, A conventionally well-known color material layer can be applied as it is in the field | area of a thermal transfer sheet.

"Sublimation dye"
The sublimable dye is not particularly limited, but a dye having a sufficient color density and not discolored by light, heat, temperature or the like is preferable. Examples of such sublimable dyes include diarylmethane dyes, triarylmethane dyes, thiazole dyes, merocyanine dyes, pyrazolone dyes, methine dyes, indoaniline dyes, pyrazolomethine dyes, acetophenone azomethine, pyrazolo dyes. Azomethine dyes such as azomethine, imidazolazomethine, imidazoazomethine and pyridone azomethine, xanthene dyes, oxazine dyes, cyanostyrene dyes such as dicyanostyrene and tricyanostyrene, thiazine dyes, azine dyes, acridine dyes, Benzeneazo dyes, pyridone azo, thiophenazo, isothiazole azo, pyrrole azo, pyrazole azo, imidazole azo, thiadiazole azo, triazole azo, disazo azo dyes, spiropyran Fee, India Linos Piropi run dyes, fluoran dye, rhodamine lactam-based dyes, naphthoquinone dyes, anthraquinone dyes, quinophthalone dyes, and the like. Specifically, red dyes such as MSRedG (Mitsui Toatsu Chemical Co., Ltd.), Macrolex Red Violet R (Bayer), CeresRed 7B (Bayer), Samalon Red F3BS (Mitsubishi Chemical Corporation), etc., Holon Brilliant Yellow Yellow dyes such as 6GL (Clariant), PTY-52 (Mitsubishi Chemical Corporation), Macrolex Yellow 6G (Bayer), Kayaset (registered trademark) Blue 714 (Nippon Kayaku Co., Ltd.), Holon Brilliant Blue S -R (Clariant), MS Blue 100 (Mitsui Toatsu Chemicals), C.I. I. And blue dyes such as Solvent Blue 63.

  The content of the sublimable dye is preferably in the range of 50% by mass to 400% by mass and more preferably in the range of 80% by mass to 300% by mass with respect to the total solid content of the binder resin described later. preferable. By setting the content of the sublimation dye within the above range, it is possible to further improve the density of the image formed by the color material layer and the storage stability of the thermal transfer sheet.

"Binder resin"
The binder resin contained in the color material layer and for supporting the sublimable dye is not particularly limited, and a resin having a certain degree of heat resistance and appropriate affinity with the sublimable dye can be used. . Examples of such binder resins include cellulose resins such as nitrocellulose, cellulose acetate butyrate, and cellulose acetate propionate; vinyl resins such as polyvinyl acetate, polyvinyl butyral, and polyvinyl acetal; poly (meth) acrylate, An acrylic resin such as poly (meth) acrylamide; a polyurethane resin; a polyamide resin; a polyester resin;

  Although there is no limitation in particular about content of binder resin, it is preferable to contain 20 mass% or more with respect to solid content total amount of the color material layer 5. FIG. There is no restriction | limiting in particular about the upper limit of content of binder resin, According to content of a sublimable dye or arbitrary additives, it can set suitably. By setting the content of the binder resin to 20% by mass or more based on the total solid content of the color material layer 5, the sublimable dye can be sufficiently retained in the color material layer 5, and further improvement in storage stability can be achieved. Can be planned.

  The color material layer 5 may contain additives such as inorganic particles and organic fine particles. Examples of inorganic particles include talc, carbon black, aluminum, molybdenum disulfide, and examples of organic fine particles include polyethylene wax and silicone resin fine particles. The color material layer 5 may contain a release agent. Furthermore, examples of the mold release agent include modified or unmodified silicone oil (including those referred to as silicone resins), phosphate esters, and fatty acid esters.

  The method for forming the color material layer 5 is not particularly limited, and a coating material for a color material layer in which a binder resin, a sublimation dye, an additive added as necessary, and a release agent are dispersed or dissolved in an appropriate solvent. A working solution is prepared, and this coating solution can be formed by applying and drying on the support 1 or a dye primer layer described later. The thickness of the color material layer is generally in the range of 0.2 μm to 2.0 μm.

(Color material primer layer)
A color material primer layer (not shown) may be provided between the support 1 and the color material layer 5 for the purpose of improving the adhesion between the support 1 and the color material layer 5.

  The color material primer layer is not particularly limited, and a conventionally known color material primer layer can be appropriately selected and used in the field of thermal transfer sheets. The color material primer layer as an example is made of a resin material. Examples of the resin material constituting the color material primer layer include polyester resins, polyvinyl pyrrolidone resins, polyvinyl alcohol resins, polyacrylate resins, polyvinyl acetate resins, polyurethane resins, styrene acrylate resins, polyacrylamides. Resin, polyamide resin, polyvinyl acetoacetal, polyvinyl butyral, and the like. Moreover, the color material primer layer may contain various additives such as organic particles and inorganic particles together with these resin components.

  There is no particular limitation on the method of forming the color material primer layer, and the color material primer layer coating solution in which the resin components exemplified above and additives added as necessary are dispersed or dissolved in an appropriate solvent is used. The coating solution can be prepared and applied to the support 1 and dried. Although there is no limitation in particular about the thickness of a color material primer layer, Usually, it is the range of 0.02 micrometer or more and 1 micrometer or less.

<< Thermal transfer image-receiving sheet >>
Next, a thermal transfer image receiving sheet (hereinafter referred to as a thermal transfer image receiving sheet of one embodiment) according to an embodiment of the present invention will be described. As shown in FIGS. 6 and 7, the thermal transfer image receiving sheet 200 of one embodiment has a configuration in which the receiving layer 2 is provided on one surface of the support 51. The receiving layer 2 is a layer located on the outermost surface of the thermal transfer image receiving sheet 200 of one embodiment. Hereinafter, each structure of the thermal transfer image receiving sheet 200 of one Embodiment is demonstrated.

(Support for thermal transfer image receiving sheet)
The support 51 of the thermal transfer image receiving sheet is not particularly limited as long as it can support the receiving layer 2. For example, as shown in FIG. 6, the support 51 may have a laminated structure in which a base 61, an adhesive layer 62, and a film 63 are laminated in this order. As shown in FIG. Alternatively, the adhesive layer 62, the substrate 61, the adhesive layer 62, and the film 63 may have a laminated structure in which they are laminated in this order. Further, it may have a single layer structure. As the support body 51 having a single layer structure, for example, a support body 51 made of a base material 61, a support body 51 made of a film 63, and the like can be cited.

"Base material"
As the base material 61, high-quality paper, coated paper, resin coated paper, art paper, cast coated paper, paperboard, synthetic paper (polyolefin type, polystyrene type), synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin Examples thereof include internal paper and cellulose fiber paper. There is no limitation in particular about the thickness of the base material 61, Usually, it is the range of 10 micrometers or more and 300 micrometers or less. Especially preferably, it is the range of 110 micrometers or more and 140 micrometers or less. In the present invention, commercially available base materials can also be used. For example, RC paper paper (STF-150 Mitsubishi Paper Industries Co., Ltd.), coated paper (Aurora Coat Nippon Paper Industries Co., Ltd.), etc. can be suitably used. It is.

"the film"
Examples of the film 63 include stretched or unstretched films of plastics such as polyethylene terephthalate and polyethylene naphthalate, which have high heat resistance, polyolefin, polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, polyamide, polymethylpentene, and the like. Examples thereof include a white opaque film formed by adding a white pigment or a filler to a resin, and a film having a microvoid inside.

  When the support body 51 takes the structure shown in FIGS. 6 and 7, the film 63 laminated on the receiving layer 2 side is preferably a film having voids. As a film having voids, voids (fine pores) can be generated by the following two methods. One is a method in which inorganic fine particles are kneaded in a polymer, and when the compound is stretched, microvoids are generated using the inorganic fine particles as nuclei. The other is to create a compound blended with an incompatible polymer (one or more types) for the main resin. When this compound is viewed microscopically, the polymers form a fine sea-island structure. When this compound is stretched, microvoids are generated due to separation of the sea-island interface or large deformation of the polymer forming the island. The thickness of the film having microvoids is usually in the range of 10 μm to 100 μm, and preferably in the range of 20 μm to 50 μm.

"Adhesive layer"
An adhesive layer 62 is preferably provided between the substrate 61 and the film 63. The adhesive layer 62 for adhering the base 61 and the film 63 together includes an adhesive and has an adhesive function. Examples of the adhesive component include urethane resins, polyolefin resins such as α-olefin-maleic anhydride resins, polyester resins, acrylic resins, epoxy resins, urea resins, melamine resins, phenol resins, Examples thereof include vinyl acetate resins and cyanoacrylate resins. Among them, a reactive type of acrylic resin or a modified one can be preferably used. Further, it is preferable to cure the adhesive using a curing agent because the adhesive force is improved and the heat resistance is also increased. As the curing agent, an isocyanate compound is generally used, but aliphatic amines, cycloaliphatic amines, aromatic amines, acid anhydrides and the like can be used.

  The thickness of the adhesive layer 62 is usually in the range of 2 μm to 10 μm in a dry state. The adhesive layer is formed by preparing an adhesive layer coating solution prepared by dispersing or dissolving the above-exemplified adhesive and the additive added as necessary in an appropriate solvent. It can be formed by applying and drying on the substrate 61.

(Receptive layer)
On the support 51 of the thermal transfer image receiving sheet, the receiving layer 2 is provided. The receiving layer 2 contains an acrylic resin, and in the thermal transfer image receiving sheet 200 of one embodiment, the acrylic resin contained in the receiving layer 2 is an acrylic resin having an acid value of 2 mgKOH / g or less. It is characterized by that. In other words, the receiving layer 2 of the thermal transfer image receiving sheet 200 is characterized by containing the “specific acrylic resin” described in the thermal transfer sheet 100 of the above-described embodiment.

  Therefore, as the receiving layer 2 of the thermal transfer image receiving sheet 200 of one embodiment, the receiving layer 2 of the thermal transfer sheet 100 of the above one embodiment can be used as it is, and detailed description thereof is omitted here.

  According to the thermal transfer image receiving sheet 200 of the embodiment having the receiving layer 2 containing the “specific acrylic resin”, the thermal transfer image receiving sheet 200 and the thermal transfer sheet 500 (see FIG. 4) having the color material layer 510, Thus, when the thermal transfer image is formed on the receiving layer 2, the releasability between the receiving layer 2 and the color material layer 510 can be improved.

(Primer layer)
As shown in FIGS. 6 and 7, a primer layer 66 may be provided between the support 51 and the receiving layer 2. By providing the primer layer 66, the adhesion between the support 51 and the receiving layer 2 can be improved. Examples of the binder resin contained in the primer layer 66 include a polyurethane resin, an acrylic resin, a polyethylene resin, a polypropylene resin, and an epoxy resin. The primer layer 66 may be a water-dispersed primer layer or a solvent-dispersed primer layer. The thickness of the primer layer 66 is preferably in the range of 0.1 μm to 20 μm.

(Back layer)
As shown in FIGS. 6 and 7, a back surface layer 68 may be provided on the surface of the substrate 61 opposite to the side on which the receiving layer 2 is provided. The back layer 68 is an arbitrary configuration in the thermal transfer image receiving sheet 200 of one embodiment.

  As the back layer 68, a layer having a desired function can be appropriately selected and used according to the application of the thermal transfer image receiving sheet 200 of one embodiment. Among these, it is preferable to use the back layer 68 having a function of improving the transportability of the thermal transfer image receiving sheet 200 and a function of preventing curling. As the back layer 68 having such a function, acrylic resin, cellulose resin, polycarbonate resin, polyvinyl acetal resin, polyvinyl alcohol resin, polyvinyl butyral resin, polyamide resin, polystyrene resin, polyester resin, halogenated polymer, etc. In this resin, as an additive, nylon filler, acrylic filler, polyamide filler, fluorine filler, polyethylene wax, organic filler such as amino acid powder, and inorganic filler such as silicon dioxide and metal oxide were added. Things can be used. Moreover, what hardened these resin with hardening | curing agents, such as an isocyanate compound and a chelate compound, can also be used as a back surface layer. The thickness of the back layer 68 is usually in the range of 0.1 μm to 20 μm, and preferably in the range of 0.5 μm to 10 μm.

  The thermal transfer image-receiving sheet of the present invention has been specifically described above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. Can take. For example, the thermal transfer image receiving sheet 200 may have various functional layers such as a barrier layer (not shown) for imparting solvent resistance. Further, the back layer 68 may not be provided. Further, a back primer layer (not shown) may be provided between the support 51 and the back layer 68.

<< Receptive layer coating liquid >>
Next, the receiving layer coating solution according to the embodiment of the present invention (hereinafter, the receiving layer coating solution of one embodiment) will be described. The receiving layer coating liquid of one embodiment contains an acrylic resin, and the acrylic resin is an acrylic resin having an acid value of 2 mgKOH / g or less. In other words, the receiving layer coating liquid according to one embodiment is characterized by containing a “specific acrylic resin”.

  According to the receiving layer coating liquid of one embodiment having this feature, the receiving layer 2 of the thermal transfer sheet 100 of the embodiment described above and the receiving layer 2 of the thermal transfer image receiving sheet 200 of the embodiment are formed. be able to. In other words, it is possible to form the receiving layer 2 having good releasability from the color material layer of the thermal transfer sheet and transferability.

  The receiving layer coating solution of one embodiment may satisfy the condition that it contains the “specific acrylic resin”, and may contain other components. Examples of the other components include various components described in the receiving layer 2 of the thermal transfer sheet 100 according to the embodiment.

  The coating solution for receiving layer of one embodiment can be prepared by dispersing or dissolving the above-mentioned “specific acrylic resin” in a suitable solvent. Examples of the solvent include hydrocarbon solvents such as hexane and pentane, aromatic solvents such as xylene, toluene and benzene, ketone solvents such as methyl ethyl ketone and acetone, alcohol solvents such as propanol, ethanol and methanol, or these And the like.

<< Method for forming thermal transfer image-receiving sheet >>
Next, a method for forming a thermal transfer image receiving sheet according to an embodiment of the present invention (hereinafter, a method for forming a thermal transfer image receiving sheet according to one embodiment) will be described. In one embodiment, a thermal transfer image receiving sheet is formed by combining a thermal transfer sheet 100 having a transfer layer 10 (see FIGS. 1A and 1B) and a transfer target 301, and transferring the transfer layer onto the transfer target 301. 10 is transferred. The method for forming a thermal transfer image receiving sheet according to an embodiment is characterized in that the thermal transfer sheet 100 having the transfer layer 10 is the thermal transfer sheet 100 according to the embodiment.

  According to the method for forming a thermal transfer image receiving sheet of the embodiment having the above characteristics, the thermal transfer image receiving sheet 300 (see FIG. 5) having the receiving layer 2 having a good releasability from the color material layer 510 of the thermal transfer sheet at the time of thermal transfer image formation. 2) can be formed. Further, it is possible to form the thermal transfer image receiving sheet 300 that has good transferability when transferring the transfer layer 10 onto the transfer target 301 and can form a high-quality thermal transfer image.

  Examples of the transfer target 301 include plain paper, fine paper, tracing paper, plastic film, vinyl chloride, vinyl chloride-vinyl acetate copolymer, and a plastic card mainly composed of polycarbonate. In addition, a transfer object 301 having a predetermined image can be used. Further, as the transfer target 301, the support 51 described in the thermal transfer image receiving sheet 200 of the above-described embodiment can be used.

  For the transfer of the transfer layer 10 onto the transfer target 301, for example, a hot stamp method, a heat roll method, or the like can be used in addition to a method using a heating device such as a thermal head. Also, other methods can be used.

  In addition, instead of using the thermal transfer sheet 100 of the above-described embodiment, the receiving layer 2 of the thermal transfer image-receiving sheet 200 may be transferred onto the transfer target 301 using the thermal transfer image-receiving sheet 200 of the above-described embodiment. it can.

<< Method for forming printed matter >>
Next, a method for forming a printed matter according to an embodiment of the present invention (hereinafter referred to as a method for forming a printed matter according to an embodiment) will be described. In one embodiment, the printed matter is formed by combining the thermal transfer image-receiving sheets 200 and 300 having the receiving layer 2 and the thermal transfer sheet 500 having the color material layer 510 with a heating device such as a thermal head. Forming a thermal transfer image. Then, the method for forming a printed product according to one embodiment is based on the thermal transfer image receiving sheet 200 according to the embodiment described above or the thermal transfer image receiving sheet according to the embodiment as the thermal transfer image receiving sheet 200 or 300 having the receiving layer 2. The formed thermal transfer image receiving sheet 300 is used. That is, the thermal transfer image receiving sheets 200 and 300 having the receiving layer 2 containing the “specific acrylic resin” are used.

  According to the method for forming a printed matter of one embodiment having this feature, the color material layer (see FIG. 5) of the thermal transfer sheet 500 at the time of thermal transfer image formation by the action of the “specific acrylic resin” contained in the receiving layer 2. 4) and the receptive layer 2 can be made releasable, and a printed matter having a high-quality thermal transfer image can be formed.

  As the thermal transfer sheet 500 having the color material layer 510, a conventionally known thermal transfer sheet can be appropriately selected and used. Further, as a thermal transfer sheet for forming a thermal transfer image, the receiving layer 2 containing “specific acrylic resin” on one surface of the support 1 described in the thermal transfer sheet 100A of the other embodiment, It is also possible to use a thermal transfer sheet 100A in which the color material layer 5 is provided in the surface order.

  Moreover, after forming a thermal transfer image in the receiving layer 2, the formation method of the printed matter of one Embodiment may include the process of forming a protective layer on the receiving layer 2, etc., for example. Moreover, you may include processes other than this.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. “Part” in the text is based on mass unless otherwise specified.

Example 1
A polyethylene terephthalate film having a thickness of 5 μm was used as a support, and a back layer coating solution having the following composition was applied and dried so that the thickness upon drying was 1 μm, thereby forming a back layer. Next, the receiving layer coating liquid 1 having the following composition is applied to the surface opposite to the side of the support on which the back layer is provided, and dried to a thickness of 1 μm to form a receiving layer. did. Next, on the receiving layer, a masking layer coating solution having the following composition is applied and dried so as to have a dry thickness of 2 μm to form a masking layer. On one side of the support, the receiving layer is formed. The thermal transfer sheet of Example 1 was obtained, in which a transfer layer in which the concealing layers were laminated in this order was provided, and the back layer was provided on the other surface of the support.

<Back layer coating liquid>
・ 1.8 parts of polyvinyl butyral resin (ESREC (registered trademark) BX-1 Sekisui Chemical Co., Ltd.)
-Polyisocyanate 5.5 parts (Bernock (registered trademark) D750 DIC Corporation)
・ Phosphate surfactant 1.6 parts (Pricesurf (registered trademark) A208N Daiichi Kogyo Seiyaku Co., Ltd.)
・ Talc 0.35 parts (Microace (registered trademark) P-3 Nippon Talc Industry Co., Ltd.)
・ Toluene 18.5 parts ・ Methyl ethyl ketone 18.5 parts

<Receptive layer coating solution 1>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 0 mg KOH / g, Mw: 120,000, Tg: 105 ° C.)
2.2 parts (Dianar (registered trademark) BR100 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

<Coating liquid for concealment layer>
・ Acrylic resin 15 parts ・ Titanium oxide 30 parts ・ Isopropyl alcohol 15 parts ・ Water 40 parts

(Example 2)
A thermal transfer sheet of Example 2 was obtained in the same manner as Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid 2 having the following composition to form a receiving layer.

<Receptive layer coating solution 2>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 0 mg KOH / g, Mw: 160000, Tg: 50 ° C.)
2.2 parts (Dianar (registered trademark) BR101 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Example 3)
A thermal transfer sheet of Example 3 was obtained in the same manner as in Example 1 except that the receiving layer was changed by changing the receiving layer coating liquid 1 to the receiving layer coating liquid 3 having the following composition.

<Receptive layer coating solution 3>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 0 mg KOH / g, Mw: 55000, Tg: 50 ° C.)
2.2 parts (Dianar (registered trademark) BR105 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

Example 4
A thermal transfer sheet of Example 4 was obtained in the same manner as Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid 4 having the following composition to form a receiving layer.

<Receiving layer coating solution 4>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 1 mg KOH / g, Mw: 480000, Tg: 105 ° C.)
2.2 parts (Dianar (registered trademark) BR88 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Example 5)
A thermal transfer sheet of Example 5 was obtained in the same manner as Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid 5 having the following composition to form a receiving layer.

<Receptive layer coating solution 5>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 2 mgKOH / g, Mw: 40000, Tg: 105 ° C.)
2.2 parts (Dianar (registered trademark) BR73 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Example 6)
A thermal transfer sheet of Example 6 was obtained in the same manner as Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid 6 having the following composition to form a receiving layer.

<Receptive layer coating solution 6>
-21.05 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 0 mg KOH / g, Mw: 120,000, Tg: 105 ° C.)
0.75 parts (Dianar (registered trademark) BR100 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Example 7)
A thermal transfer sheet of Example 7 was obtained in the same manner as Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid 7 having the following composition to form a receiving layer.

<Receptive layer coating solution 7>
Acrylic resin (acid value: 0 mg KOH / g, Mw: 120,000, Tg: 105 ° C.)
21.8 parts (Dianar (registered trademark) BR100 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Comparative Example 1)
A thermal transfer sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the receiving layer coating solution 1 was changed to the receiving layer coating solution A having the following composition to form a receiving layer.

<Coating liquid A for receiving layer>
-16.8 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Comparative Example 2)
A thermal transfer sheet of Comparative Example 2 was obtained in the same manner as in Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid B having the following composition to form a receiving layer.

<Coating fluid B for receiving layer>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin 2.2 parts (acid value: 10.5 mg KOH / g, Mw: 25000, Tg: 105 ° C.)
(Dianar (registered trademark) BR87 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Comparative Example 3)
A thermal transfer sheet of Comparative Example 3 was obtained in the same manner as Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid C having the following composition to form a receiving layer.

<Coating liquid C for receiving layer>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin 2.2 parts (Acid value: 6.5 mg KOH / g, Mw: 120,000, Tg: 105 ° C.) (Dianal (registered trademark) BR84 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Comparative Example 4)
A thermal transfer sheet of Comparative Example 4 was obtained in the same manner as in Example 1 except that the receiving layer coating liquid 1 was changed to the receiving layer coating liquid D having the following composition to form a receiving layer.

<Coating fluid D for receiving layer>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 3.5 mg KOH / g, Mw: 30000, Tg: 75 ° C.)
2.2 parts (Dianar (registered trademark) BR113 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Comparative Example 5)
A thermal transfer sheet of Comparative Example 5 was obtained in the same manner as in Example 1 except that the receiving layer coating liquid E was changed to the receiving layer coating liquid E having the following composition to form a receiving layer.

<Coating fluid E for receiving layer>
-19.6 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL Nissin Chemical Industry Co., Ltd.)
Acrylic resin (acid value: 3 mgKOH / g, Mw: 85000, Tg: 100 ° C.)
2.2 parts (Dianar (registered trademark) BR83 Mitsubishi Rayon Co., Ltd.)
-Epoxy aralkyl-modified silicone oil 1.2 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Methylstyrene modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
-0.8 parts of polyether-modified silicone oil (KF-352A Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 40 parts ・ Toluene 40 parts

(Creation of thermal transfer sheet with color material layer)
Using a 4.5 μm-thick polyethylene terephthalate film that has been subjected to easy adhesion treatment as a support, a coating solution for a heat-resistant slipping layer having the following composition is applied onto the support so that the thickness when dried is 0.8 μm. It dried and formed the heat resistant slipping layer. Next, a dye primer layer was formed by applying and drying a coating solution for a dye primer layer having the following composition on the other surface of the substrate so that the thickness upon drying was 0.15 μm. On this dye primer layer, a yellow color material layer coating solution, a magenta color material layer coating solution, and a cyan color material layer coating solution are respectively surface-sequential so that the thickness upon drying is 0.6 μm. And dried to form a color material layer to obtain a thermal transfer sheet having the color material layer.

(Coating fluid for heat resistant slipping layer)
Polyvinyl acetal resin (hydroxyl value 12% by mass) 60.8 parts (ESREC (registered trademark) KS-1 Sekisui Chemical Co., Ltd.)
Polyisocyanate (NCO = 17.3 mass%) 4.2 parts (Bernock (registered trademark) D750 DIC Corporation)
・ Filler (zinc stearyl phosphate) 10 parts (LBT1830 refining Sakai Chemical Industry Co., Ltd.)
・ Filler (zinc stearate) 10 parts (SZ-PF Sakai Chemical Industry Co., Ltd.)
・ Filler (polyethylene wax) 3 parts (Polywax 3000 Toyo Adre Co., Ltd.)
・ 7 parts of filler (ethoxylated alcohol-modified wax) (Unitox 750 Toyo Adre Co., Ltd.)
・ Toluene 200 parts ・ Methyl ethyl ketone 100 parts

(Dye primer layer coating solution)
-Colloidal alumina (solid content 10.5%) 3.5 parts (alumina sol 200 Nissan Chemical Industries, Ltd.)
・ Vinyl acetate vinylpyrrolidone copolymer 1.5 parts (PVP / VA E-335 AISP Japan)
・ Water 50 parts ・ Isopropyl alcohol 50 parts

(Coating solution for yellow color material layer)
-Disperse Yellow 201 4.0 parts-Polyvinyl acetal resin 3.5 parts (ESREC (registered trademark) KS-5 Sekisui Chemical Co., Ltd.)
・ Polyethylene wax 0.1 part ・ Methyl ethyl ketone 45.0 parts ・ Toluene 45.0 parts

(Coating liquid for magenta color material layer)
・ Disperse Red 60 1.5 parts ・ Disperse Violet 26 2 parts ・ Polyvinyl acetal resin 4.5 parts (ESREC (registered trademark) KS-5 Sekisui Chemical Co., Ltd.)
・ Polyethylene wax 0.1 part ・ Methyl ethyl ketone 45 parts ・ Toluene 45 parts

(Cyan color material layer coating solution)
・ Solvent Blue 63 2 parts ・ Disperse Blue 354 2 parts ・ Polyvinyl acetal resin 3.5 parts (ESREC (registered trademark) KS-5 Sekisui Chemical Co., Ltd.)
・ Polyethylene wax 0.1 part ・ Methyl ethyl ketone 45 parts ・ Toluene 45 parts

(Create transfer object)
RC paper (STF-150 Mitsubishi Paper Industries, Inc., thickness 190 μm) was used as a support, and a coating liquid for an adhesive layer having the following composition was formed on this support by a gravure coating method, resulting in a dry thickness of 3 μm. The adhesive layer was formed by coating and drying. Next, a base material (polyethylene terephthalate film) having a thickness of 25 μm was laminated on the adhesive layer to obtain a laminate in which the support, the adhesive layer, and the base material were laminated in this order.

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

  Next, an intermediate layer is formed by applying and drying an intermediate layer coating solution having the following composition on the substrate of the laminate obtained above by a gravure coating method so that the thickness upon drying is 1.2 μm. Then, on the intermediate layer, a receiving layer is formed by applying and drying a receiving layer coating solution having the following composition by a gravure coating method so that the thickness upon drying is 4 μm. A substrate to be transferred was obtained by laminating a substrate, an intermediate layer, and a receiving layer in this order.

<Intermediate layer coating solution>
・ 10 parts of water-dispersed polyester resin (solid content 25%, Tg 20 ° C.) (Vylonal (registered trademark) MD-1480 Toyobo Co., Ltd.)
-Conductive synthetic layered silicate (average primary particle size 25 nm) 10 parts (Laponite JS Wilber Ellis)
・ Water 80 parts

<Coating liquid for receiving layer>
-15 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) C Nissin Chemical Industry Co., Ltd.)
・ 0.75 parts of silicone (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Silicon 0.1 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.)
・ Methyl ethyl ketone 33 parts ・ Toluene 33 parts

(Transfer layer transfer (Creation of thermal transfer image-receiving sheet))
Transferring the transfer layer onto the transfer material under the conditions of 175/255 gradations (energy gradations) using the following printer in combination with the transfer object prepared above and the thermal transfer sheets of the examples and comparative examples. The thermal transfer image-receiving sheets of the examples and comparative examples were obtained.

(Transferability evaluation)
In obtaining the thermal transfer image receiving sheet of each of the above examples and comparative examples using the following printer, the transfer layer transferred onto the transfer target is peeled off from the thermal transfer sheet while transferring the transfer layer onto the transfer target. The tensile strength of the thermal transfer sheet was measured using a tension meter (Okura Industry Co., Ltd. ASK-1000 model) provided between the thermal transfer sheet take-up roll and the heating means (thermal head) in the following printer. Measured. The tensile strength of the thermal transfer sheet measured here indicates a substantial value of the peeling force when the transfer layer transferred onto the transfer target is peeled from the thermal transfer sheet of each example and comparative example. ing. That is, it shows a substantial value of the peeling force of the transfer layer. The peelability of Comparative Example 1 was used as the reference peel force, and the transferability was evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1.

(Printer)
Thermal head: KEE-57-12GAN2-STA (Kyocera Corporation)
Heating element average resistance: 3303 (Ω)
Main scanning direction printing density: 300 (dpi)
Sub-scanning direction printing density: 300 (dpi)
Printing voltage: 27 (V)
Line cycle: 1 (msec./line)
Printing start temperature: 35 (℃)
Pulse duty ratio: 85 (%)
Printing start temperature: 29.0 (° C.) to 36.0 (° C.)
Distance from exothermic point to release plate: 4.5 (mm)
Conveying speed: 84.6 (mm / sec.)
Printing pressure: 3.5 (kgf) to 4.0 (kgf)

"Evaluation criteria"
When the peeling force of Comparative Example 1 was set as the reference peeling force,
A: The peel force is less than 0.8 times the reference peel force.
B: The peeling force is 0.8 times or more and less than 0.9 times the reference peeling force.
C: The peeling force is 0.9 times or more and less than 1.05 times the reference peeling force.
D: The peeling force is 1.05 times or more of the reference peeling force.

(Formation of prints)
The thermal transfer sheet having the color material layer prepared above and the thermal transfer image receiving sheets of the examples and comparative examples obtained above were combined, and the thermal transfer sheets of the examples and comparative examples were combined with the thermal transfer sheets of 2 cm in width using the printer. While printing a vertical stripe image (yellow image (RGB (255, 255, 0))), the thermal transfer sheet having the color material layer is peeled off from the thermal transfer sheet of each of the examples and the comparative examples by the release plate of the printer. By doing so, the printed matter of each Example and the comparative example was obtained.

(Releasability evaluation)
In obtaining the printed matter of each of the above Examples and Comparative Examples using the printer, each Example and each Example, while transferring the color material of the color material layer on the thermal transfer image receiving sheet of the Comparative Example, The tensile strength of the thermal transfer sheet having the color material layer when the thermal transfer sheet having the color material layer is peeled from the thermal transfer image receiving sheet of the comparative example, and the winding roll of the thermal transfer sheet and heating means ( Measured with a tension meter (Okura Industry Co., Ltd. ASK-1000 model number) provided between the head and the thermal head. In addition, the tensile strength of the thermal transfer sheet having the color material layer measured here is substantially the same when the thermal transfer sheet having the color material layer is peeled (released) from the thermal transfer sheets of the examples and comparative examples. It shows the peel force. That is, the substantial peeling force (release property) of the transfer layer of the thermal transfer image-receiving sheet of each example and comparative example is shown. With the peel force in Comparative Example 1 as the reference peel force, the releasability was evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1. In addition, in the evaluation of releasability, the thermal transfer sheet having the color material layer cannot be normally peeled from the thermal transfer image receiving sheet for those evaluated as “NG”, and the thermal transfer image receiving sheet and the color material layer Printing defects such as partial fusing with the thermal transfer sheet having the above occur.

"Evaluation criteria"
When the peeling force of Comparative Example 1 was set as the reference peeling force,
A: The peel force is less than 0.8 times the reference peel force.
B: The peeling force is 0.8 times or more and less than 0.9 times the reference peeling force.
C: The peeling force is 0.9 times or more and less than 1.05 times the reference peeling force.
NG: The peeling force is 1.05 times or more of the reference peeling force.

(Concentration evaluation)
The thermal transfer sheet having the color material layer prepared above and the thermal transfer image-receiving sheets of the respective examples and comparative examples obtained above are combined, and the above printer is used to produce a yellow color material layer, a magenta color material layer, and a cyan color. Printing was performed in the order of the material layers to form a black image (RGB (0, 0, 0)). The reflection density of the formed black image was measured, and density evaluation was performed based on the following evaluation criteria. The reflection density was measured with a spectrophotometer (i1 X-Rite). The reflection density of Comparative Example 1 was set as the reference reflection density, and the density evaluation was performed based on the following evaluation criteria. The evaluation results are shown in Table 1.

"Evaluation criteria"
When the reflection density of Comparative Example 1 is set as the reference reflection density,
A: The reflection density is 0.95 times or more of the reference reflection density.
B: The reflection density is less than 0.95 times the reference reflection density.

DESCRIPTION OF SYMBOLS 100 ... Thermal transfer sheet 1 ... Thermal transfer sheet support 2 ... Receiving layer 4 ... Functional layer 200, 300 ... Thermal transfer image receiving sheet 51 ... Thermal transfer image receiving sheet support 66 Primer layer 68 ... Back layer 61 ... Base material 62 ... Adhesive layer 63 ... Film 400 ... Intermediate transfer medium 401 ... Intermediate transfer medium support 410 ... Release layer 500 ... Thermal transfer sheet 501 having color material layer ... Thermal transfer sheet support 5 and 510 having color material layer ... Color material layer

Claims (10)

A thermal transfer image receiving sheet provided with a receiving layer on one side of a support,
The receiving layer contains an acrylic resin,
The thermal transfer image-receiving sheet, wherein the acrylic resin has an acid value of 2 mgKOH / g or less.   2. The thermal transfer image receiving sheet according to claim 1, wherein the receiving layer contains 5% by mass or more of an acrylic resin having an acid value of 2 mgKOH / g or less based on the total mass of the receiving layer.   The thermal transfer image receiving sheet according to claim 1 or 2, wherein the receiving layer contains a vinyl chloride-vinyl acetate copolymer. A thermal transfer sheet for forming a thermal transfer image-receiving sheet having a receiving layer,
A transfer layer is provided on one side of the support;
The transfer layer has a single-layer configuration consisting only of a receiving layer or a stacked configuration including a receiving layer, and when the transfer layer has a stacked configuration, the receiving layer is the supporting layer among the layers constituting the transfer layer. Located closest to the body,
The receiving layer contains an acrylic resin,
The thermal transfer sheet, wherein the acrylic resin has an acid value of 2 mgKOH / g or less.   The thermal transfer sheet according to claim 4, wherein the receiving layer contains 5% by mass or more of an acrylic resin having an acid value of 2 mgKOH / g or less based on the total mass of the receiving layer.   The thermal transfer sheet according to claim 4 or 5, wherein the receiving layer contains a vinyl chloride-vinyl acetate copolymer. A receiving layer coating solution for forming a receiving layer,
The receiving layer coating solution contains an acrylic resin,
The receiving layer coating solution, wherein the acrylic resin has an acid value of 2 mgKOH / g or less. A method of forming a thermal transfer image receiving sheet,
Combining a thermal transfer sheet having a transfer layer and a transfer target, and transferring the transfer layer of the thermal transfer sheet onto the transfer target;
The method for forming a thermal transfer image receiving sheet, wherein the thermal transfer sheet is the thermal transfer sheet according to any one of claims 4 to 6. A method for forming a print,
A step of combining the thermal transfer image receiving sheet according to any one of claims 1 to 3 with a thermal transfer sheet having a color material layer, and forming a thermal transfer image on the receiving layer of the thermal transfer image receiving sheet, A method for forming a print. A method for forming a print,
A step of forming a thermal transfer image on the receiving layer of the thermal transfer image receiving sheet by combining the thermal transfer image receiving sheet formed by the thermal transfer image receiving sheet forming method according to claim 8 and a thermal transfer sheet having a color material layer. A method for forming a printed matter characterized by the above.

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