Antiviral transfer foil, antiviral card, method for manufacturing antiviral transfer foil, and method for manufacturing antiviral card

Abstract

To provide an antiviral transfer foil that gives a transfer object excellent antiviral properties, and keeps good design of the transfer object, an antiviral card including the transfer foil, a method for producing the antiviral transfer foil and a method for producing the antiviral card.SOLUTION: An antiviral transfer foil 1 has a substrate sheet 11 and a transfer layer 21 formed on one side of the substrate sheet 11. The transfer layer 21 comprises an organic antiviral agent.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an antiviral transfer foil capable of transferring an antiviral resin layer onto the surface of various articles, an antiviral card that is a card-type medium made primarily of resin and has antiviral properties imparted to the outermost layer by the transfer foil, among information recording media such as commuter passes, train tickets, admission tickets, prepaid cards, credit cards, cash cards, point cards, various securities, and identification cards, and a method for manufacturing the same. [Background technology]

[0002] In recent years, the demand for antibacterial and antiviral properties has increased, and the development of antiviral products with antiviral properties has become an urgent need. Accordingly, there is an increasing need to impart antiviral properties to card-type media such as credit cards and cash cards, which are frequently touched by people.

[0003] Conventionally, transfer foils (transfer sheets) have been known that impart antiviral properties to the surface of an article by transferring an antiviral resin layer onto the surface of the article, thereby covering the surface with the resin layer. As a technique for imparting antiviral or antibacterial properties to a resin layer, for example, a technique has been known in which, when forming the resin layer, the resin layer is formed on a base sheet on which an antiviral agent has been disposed, and after the resin layer is transferred, the antiviral agent is exposed to the external environment on the outermost surface of the article (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2016 / 084774 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, a card whose main material is resin (plastic) is a laminate of resin materials, and antiviral properties can be imparted to the plastic card by transferring a resin layer containing an antiviral agent to the outermost surface of the laminate. However, when a resin layer is formed by conventional techniques on the outermost surface of an article (for example, a card) so that the antiviral agent is exposed to the external environment, there is a problem in that the antiviral performance of the article, such as a card, covered with the resin layer is not fully exhibited.

[0006] Furthermore, if the amount of antiviral agent added that is exposed on the surface is increased in order to improve antiviral performance, the resin layer may become cloudy, which may impair the design of the transferred object. Furthermore, if the amount of antiviral agent kneaded into the resin is reduced in order to suppress clouding, the design of the transferred object is ensured, but the amount of antiviral agent exposed on the surface of the transferred object is reduced, making it more difficult for the antiviral agent to come into contact with viruses on the surface of the transferred object, which may result in a further reduction in the antiviral effect.

[0007] The present invention has been made in consideration of these problems, and aims to provide an antiviral transfer foil that imparts excellent antiviral properties to an object to which a transfer is made and that maintains the design of the object to which a transfer is made well, an antiviral card using the transfer foil, a method for manufacturing an antiviral transfer foil, and a method for manufacturing an antiviral card. [Means for solving the problem]

[0008] In order to solve the above problems, an antiviral transfer foil according to one embodiment of the present disclosure includes a base sheet and a transfer layer formed on one surface of the base sheet, and the transfer layer contains an organic antiviral agent.

[0009] An antiviral card according to another aspect of the present disclosure includes the transfer layer of the antiviral transfer foil, an exterior sheet having the transfer layer as the outermost layer, and a core substrate having the exterior sheet provided on at least one surface thereof.

[0010] Furthermore, a method for producing an antiviral transfer foil according to yet another aspect of the present disclosure includes a step of forming a transfer layer on one surface of a base sheet formed using a first resin material, and in the step of forming the transfer layer, a second resin material is applied to one surface of the base sheet to form a release layer, and a third resin material containing an organic antiviral agent is applied to the release layer to form an intermediate layer on the surface side of the transfer layer.

[0011] Furthermore, a method for manufacturing an antiviral card according to yet another aspect of the present disclosure includes the steps of providing an exterior sheet on at least one surface of a core substrate and transferring a transfer layer of a transfer foil to the surface of the exterior sheet opposite the core substrate, wherein the transfer layer of the transfer foil has a release layer in contact with one surface of the base sheet and an intermediate layer that is thicker than the release layer and is located on the surface side of the transfer layer; and in the step of transferring the transfer layer, the transfer layer is transferred to the outermost surface of the exterior sheet by lamination with the intermediate layer in contact with the outermost surface of the exterior sheet. [Effects of the Invention]

[0012] According to aspects of the present disclosure, it is possible to provide an antiviral transfer foil that imparts excellent antiviral properties to the surface of an object to be transferred and maintains the design of the object to be transferred well, and an antiviral card using the transfer foil. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration example of a transfer foil according to a first embodiment of the present disclosure. [Figure 2] FIG. 4 is a cross-sectional view showing a configuration example of a transfer foil according to a second embodiment of the present disclosure. [Figure 3] FIG. 10 is a cross-sectional view showing a configuration example of a transfer foil according to a third embodiment of the present disclosure. [Figure 4] FIG. 10 is a cross-sectional view showing a configuration example of an antiviral card according to a fourth embodiment of the present disclosure. [Figure 5]FIG. 1(a) is a cross-sectional view showing the card body and transfer foil at the start of lamination, and FIG. 1(b) is a cross-sectional view showing an antiviral card in which the transfer layer has been transferred to the card body by lamination. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Furthermore, the embodiments shown below are merely examples of configurations for embodying the technical idea of the present invention, and the technical idea of the present invention is not limited to the materials, shapes, structures, etc. of the components described below. The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims. In the following description, the side of the transfer foil that comes into contact with the object to be transferred is sometimes referred to as "upper", and the side opposite to the side that comes into contact with the object to be transferred (the base sheet side) is sometimes referred to as "lower". Hereinafter, each aspect of each embodiment of the present disclosure will be described with reference to the drawings.

[0015] 1. First embodiment (Basic structure of transfer foil 1) The basic configuration of a transfer foil according to a first embodiment of the present invention (hereinafter referred to as "this embodiment") will be described with reference to Fig. 1. Fig. 1 is a cross-sectional schematic diagram showing the general configuration of a transfer foil 1 of this embodiment. As shown in FIG. 1, the transfer foil 1 according to this embodiment includes a base sheet 11 and a transfer layer 21 formed on one surface of the base sheet 11. The transfer foil 1 is formed, for example, in a sheet shape and is also referred to as a transfer sheet. Depending on the manufacturing method, the transfer foil 1 can be formed in a roll shape. Furthermore, by forming the roll-shaped transfer foil into a sheet, a sheet-shaped transfer foil (transfer sheet) can be formed. The transfer foil 1 is a laminate in which the transfer layer 21 is laminated on the base sheet 11.

[0016] In the transfer foil 1, the transfer layer 21 is a thin resin film that is transferred to a transfer target and thereby provides the transfer target with properties such as scratch resistance, abrasion resistance, and contamination resistance. As shown in Fig. 1, in this embodiment, the transfer layer 21 has a release layer 12 that contacts one side of the base sheet 11, and an intermediate layer 13 that is located on the surface side of the transfer layer 21 and is thicker than the release layer 12. That is, in this embodiment, the transfer layer 21 is composed of multiple layers (two layers in this example).

[0017] The transfer foil 1 according to this embodiment can be transferred to an object by, for example, arranging the surface of the transfer layer 21 opposite the base sheet 11, i.e., the intermediate layer 13, in contact with the surface of the object to be transferred, and peeling the surface of the transfer layer 21 that contacts the base sheet 11, i.e., the release layer 12, from the base sheet 11. This allows the transfer layer 21 to be used as the layer (outermost layer) located on the uppermost surface (outermost surface) of the object to be transferred. The object to be transferred is not particularly limited, but for example, by transferring the transfer layer 21 to the surface of a card-type medium (hereinafter simply referred to as a "card"), the transfer layer 21 can be used as the outermost layer of the card.

[0018] The base sheet 11 also serves as a support for the transfer layer 21 in the transfer foil 1. As will be described in detail later, in the transfer foil 1 according to this embodiment, both the base sheet 11 and the transfer layer 21 are made of a resin material. In other words, the transfer foil 1 is a laminate of resin materials. Each layer of the base sheet 11 and the transfer layer 21 will be described in detail below.

[0019] (Base sheet 11) The base sheet 11 is a layer that serves as the base of the transfer foil 1. In this embodiment, a thermoplastic resin can be used as the base sheet 11. Examples of thermoplastic resins include polyolefin resins such as polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, ethylene-α-olefin copolymer, and propylene-α-olefin copolymer; polyolefin-based resins such as olefin-based copolymer resins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer); and polyolefin-based resins such as polyethylene terephthalate, glycol-modified polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate, polya Examples of the resin that can be used include polyester resins such as acrylate and polycarbonate, acrylic resins such as poly(meth)acrylonitrile, polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, and polyacrylamide, polyamide resins such as 6-nylon, 6,6-nylon, and 6,10-nylon, styrene resins such as polystyrene, AS resin, and ABS resin, vinyl resins such as polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, and vinyl chloride-vinyl acetate copolymer, and fluorine-based resins such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, and ethylene-perfluoroalkyl vinyl ether copolymer, as well as mixtures, copolymers, composites, and laminates of two or more of these resins.

[0020] Among thermoplastic resins, polyethylene terephthalate (PET) is preferably used as the material for the base sheet 11. When polyethylene terephthalate is used as the material for the base sheet 11, for example, transparent biaxially oriented PET may be used.

[0021] The thickness of the base sheet 11 is preferably in the range of 40 μm to 100 μm, more preferably 50 μm to 75 μm. When the thickness of the base sheet 11 is 40 μm or more, the transfer performance of the transfer layer 21 to the transfer target object can be improved, and the handleability (ease of handling) when made into a sheet is improved. Furthermore, when the thickness of the base sheet 11 is 100 μm or less, the base sheet 11 is not formed thicker than necessary, which improves transfer performance and reduces the manufacturing cost of the transfer foil 1.

[0022] (Transfer layer 21) As shown in Fig. 1, the transfer layer 21 is a layer formed on one surface of the base sheet 11, and as described above, is a layer that is applied to the outermost layer of the transfer target, thereby imparting various functions to the transfer target, such as scratch resistance, abrasion resistance, and contamination resistance. As will be described in detail below, the transfer layer 21 contains an antiviral agent (e.g., an organic antiviral agent). This imparts excellent antiviral properties to the transfer target and suppresses clouding of the transfer layer 21, thereby maintaining the design of the transfer target well. A transfer foil that has been given antiviral properties by containing an antiviral agent is called an "antiviral transfer foil."

[0023] The transfer foil 1 according to this embodiment has multiple layers stacked together to form the transfer layer 21. More specifically, the transfer layer 21 has a release layer 12 located on the base sheet 11 side and an intermediate layer 13 located on the opposite side of the base sheet 11. Furthermore, in the transfer foil 1 according to this embodiment, each layer of the transfer layer 21 (the release layer 12 and the intermediate layer 13) is coated on one surface of the base sheet 11 by, for example, gravure coating. However, without being limited to this, the release layer 12 and the intermediate layer 13 may be coated on the base sheet 11 by various coating methods such as roll coating. Furthermore, it is preferable that the release layer 12 and the intermediate layer 13 have a transparency (colorless and transparent, colored and transparent, translucent) sufficient to allow the printed content (characters, patterns, pictures, etc.) applied to a card, which is an example of a transfer target of the transfer layer 21, to be seen through. The release layer 12 and the intermediate layer 13 will be described in detail below.

[0024] [Release layer 12] The release layer 12 forms the outermost surface of the transfer target object, and is a layer for ensuring the surface strength of the transfer target object and improving its suitability for post-processing. The release layer is also called a "protective release layer" because it covers the outermost surface of the transfer target object to protect the surface of the transfer target object. The release layer 12 also has a mechanism for causing peeling at the interface between the base sheet 11 and the release layer 12 when the transfer layer 21 is transferred to the transfer target object (e.g., a card).

[0025] The release layer 12 contains a resin material. As with the base sheet 11, the resin material used for the release layer 12 may be, for example, a thermoplastic resin. The thermoplastic resin used in the release layer 12 is not particularly limited, and examples thereof include polyolefin resins such as polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, ethylene-α-olefin copolymer, and propylene-α-olefin copolymer; polyolefin-based resins such as olefin-based copolymer resins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer); polyethylene terephthalate, glycol-modified polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, and 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate; phthalate, polyarylate, polycarbonate and other polyester-based resins; poly(meth)acrylonitrile, polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, polyacrylamide and other acrylic resins; 6-nylon, 6,6-nylon, 6,10-nylon and other polyamide-based resins; polystyrene, AS resin, ABS resin and other styrene-based resins; polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, vinyl chloride-vinyl acetate copolymer and other vinyl resins; polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, ethylene-perfluoroalkyl vinyl ether copolymer and other fluorine-based resins; and mixtures, copolymers, composites, laminates and the like of two or more of these can be used.

[0026] The thermoplastic resin used for the release layer 12 may be appropriately selected from the many types already listed. For example, in the card manufacturing process, hologram processing may be performed on the transfer layer 21 applied as the outermost layer of the card. From the viewpoint of improving hologram processing properties, it is preferable to use a vinyl chloride resin such as polyvinyl chloride as the resin material forming the release layer 12 that becomes the outermost surface of the card. In other words, the release layer 12 may be composed of a resin material containing a vinyl chloride resin.

[0027] Furthermore, for example, an ultraviolet curable resin may be used as the resin material used for the release layer 12. The ultraviolet curable resin used for the release layer 12 is not particularly limited, and examples thereof include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins.

[0028] Furthermore, for example, a thermosetting resin may be used as the resin material used for the release layer 12. There are no particular limitations on the thermosetting resin, and examples thereof include one-component or two-component reactive curing polyurethane resins and epoxy resins.

[0029] In this embodiment, the thickness (film thickness) of the release layer 12 is preferably in the range of 0.2 μm to 1.0 μm. When the film thickness of the release layer 12 is in this range, the transfer performance of the transfer layer 21 to the transfer target (for example, the ease of transfer of the transfer layer 21 to the transfer target) can be improved. [Middle Class 13] The intermediate layer 13 is a layer that contacts the release layer 12, and is formed on the transfer layer 21 on the side opposite to the base sheet 11. The intermediate layer 13 is a layer that is located between the release layer 12 and the surface of the object to be transferred (for example, a card) when the transfer layer 21 is transferred to the object to be transferred, and has the function of improving adhesion with the resin material that forms the surface of a card, which is an example of the object to be transferred, and adhesion between the layers in the transfer foil 1.

[0030] The intermediate layer 13 is configured to contain a resin material. As the resin material used for the intermediate layer 13, for example, a thermoplastic resin can be used, similar to the base sheet 11 and the release layer 12. There are no particular limitations on the thermoplastic resin used for the intermediate layer 13, and it may be appropriately selected from the many types of thermoplastic resins listed as usable for the release layer 12. In particular, acrylic resins are suitable for applications that require improved adhesion to the surface of general cards. In other words, the intermediate layer 13 may be configured to contain an acrylic resin as a resin material.

[0031] The resin material used for the intermediate layer may be, for example, an ultraviolet curable resin or a thermosetting resin, similar to the release layer 12.

[0032] [Antiviral agents] Furthermore, in the transfer foil 1 according to this embodiment, the intermediate layer 13 of the transfer layer 21 contains an antiviral agent. This provides an excellent antiviral effect on the outermost layer of an item (e.g., a card) that comes into contact with people or objects. This provides the surface of the transfer object with superior antiviral properties compared to conventional methods in which an antiviral agent is added to the outermost layer (release layer) of the transfer object, resulting in the antiviral agent being exposed on the surface of the transfer object. Furthermore, although antiviral agents may appear white when added to a resin, adding the antiviral agent to the intermediate layer 13 in the transfer layer 21 can suppress clouding of the transfer layer 21 compared to conventional methods in which the antiviral agent is added so that it is exposed on the surface of the release layer after transfer. This allows the design of the transfer object to be well maintained.

[0033] In this embodiment, the active ingredient of the antiviral agent added to the intermediate layer 13 is an organic material. That is, the intermediate layer 13 contains a resin and an organic antiviral agent. This provides the transfer foil 1 according to this embodiment with excellent antiviral properties and excellent durability of the antiviral effect. Furthermore, an antiviral agent made of an organic material can exhibit a more immediate antiviral effect than an antiviral agent made of an inorganic material (an inorganic antiviral agent). Furthermore, the use of an inorganic antiviral agent may cause discoloration or other effects on the intermediate layer 13, the release layer 12 in contact with the intermediate layer 13, and the surface of the transfer target (e.g., a card). In consideration of these points, an organic antiviral agent is preferably used as the antiviral agent added to the intermediate layer 13.

[0034] In the transfer foil 1 according to this embodiment, examples of organic antiviral agents added to the intermediate layer 13 include halocarban, chlorophenesin, lysozyme chloride, alkyldiaminoethylglycine hydrochloride, isopropylmethylphenol, thymol, hexachlorophene, berberine, thioxolone, salicylic acid and derivatives thereof, benzoic acid, sodium benzoate, parahydroxybenzoic acid esters, parachlormetacresol, benzalkonium chloride, phenoxyethanol, isopropylmethylphenol, carbolic acid, sorbic acid, potassium sorbate, hexachlorophene, methylparaben ... Examples of such antibacterial agents include chlorophene, chlorhexidine chloride, trichlorocarbanilide, thianthol, hinokitiol, triclosan, trichlorohydroxydiphenyl ether, chlorhexidine gluconate, phenoxyethanol, resorcinol, azulene, salicylic acid, zinc pyrithione, mononitroguaiacol sodium, fennel extract, Japanese pepper extract, cetylpyridinium chloride, benzethonium chloride and undecylenic acid derivatives, alkylbenzenesulfonic acid or a salt thereof, a copolymer containing styrenesulfonate, and anionic sodium salts.

[0035] In the present embodiment, intermediate layer 13 may contain only one type of the above-mentioned organic antiviral agent, or may contain two or more types of organic antiviral agents. Thus, in the transfer foil 1 according to this embodiment, the intermediate layer 13 contains a resin material and an organic antiviral agent. By containing a resin material and an antiviral agent (in this example, an organic antiviral agent) in the intermediate layer 13, the resin material acts as a binder, which prevents loss of the antiviral agent during the manufacturing process of the transfer foil 1, during transfer processing onto the surface of a card (an example of a transfer target), and in the user's card usage environment, thereby making it possible to maintain antiviral performance.

[0036] In this embodiment, the content of the organic antiviral agent in the intermediate layer 13 is preferably within a range of 10 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the resin in the intermediate layer 13. By ensuring that the content of the antiviral agent is within this range, it is possible to reliably impart excellent antiviral properties to the transfer foil 1, and as a result, it is possible to reliably impart excellent antiviral properties to the transfer target. Furthermore, clouding of the transfer foil 1 can be further suppressed, thereby maintaining the design of the transfer target. Furthermore, by ensuring that the content of the antiviral agent in the intermediate layer 13 is within the above range, it is possible to prevent the addition of more antiviral agent than necessary during the production of the transfer foil 1, thereby reducing production costs. On the other hand, if the content of the organic antiviral agent in the intermediate layer 13 is less than 10 parts by mass relative to 100 parts by mass of the resin in the intermediate layer 13, the antiviral effect may not be stable and the antiviral effect may be reduced. Also, if the content of the antiviral agent exceeds 30 parts by mass relative to 100 parts by mass of the resin in the intermediate layer 13, clouding of the transfer layer 21 may not be sufficiently suppressed, reducing the design of the transfer target. Furthermore, if the content of the antiviral agent exceeds 30 parts by mass, the transfer performance of the transfer layer 21 to the transfer target may be reduced, or the suitability for post-processing of the surface of the transfer target after the transfer layer 21 is transferred may be reduced.

[0037] One possible method for suppressing clouding of the transfer layer 21 is to thin the transfer layer 21 (peeling layer 12, intermediate layer 13), but if the film thickness is too thin (for example, less than 0.2 μm), the transfer performance of the transfer foil may be reduced. In contrast, in the transfer foil 1 according to this embodiment, by setting the amount of organic antiviral agent added within the above-mentioned range, it is possible to improve transfer performance and suppress clouding of the transfer layer 21, thereby maintaining good design of the transferred object.

[0038] Furthermore, the content of the organic antiviral agent in intermediate layer 13 is more preferably within a range of 10 parts by mass or more and 20 parts by mass or less relative to 100 parts by mass of the resin in intermediate layer 13. When the content of the antiviral agent is within this range, excellent antiviral properties are reliably imparted to the transfer target object, and clouding of transfer layer 21 can be further suppressed, thereby more favorably maintaining the design of the transfer target object.

[0039] In the present invention, the antiviral agent contained in the intermediate layer 13 of the transfer layer 21 is not limited to an organic antiviral agent. The intermediate layer 13 may contain an inorganic antiviral agent. The inorganic antiviral agent is preferably a silver-based material in terms of antiviral effect. Examples of inorganic antiviral agents that can be used include antibacterial zeolite, antibacterial apatite, antibacterial zirconia, and the like, which are formed by incorporating metal ions, such as silver ions, copper ions, or zinc ions, into inorganic compounds such as zeolite, apatite, and zirconia. The antiviral agent may also be configured such that a silver-based material is supported on an inorganic material. The "inorganic material" may be, for example, "glass," but is not limited to glass. Supporting silver on an inorganic substance can prevent the silver component from falling off over time and from transferring to base sheet 11. Since inorganic antiviral agents have excellent durability of their antiviral effect, adding an inorganic antiviral agent can further improve the durability of the antiviral effect.

[0040] Intermediate layer 13 may contain only one type of the inorganic antiviral agent described above, or may contain two or more types of inorganic antiviral agents. Also, a mixture of an organic antiviral agent and an inorganic antiviral agent may be used. When an inorganic antiviral agent is used, the content of the antiviral agent in intermediate layer 13 is preferably in the range of 10 parts by mass to 30 parts by mass, and more preferably in the range of 10 parts by mass to 20 parts by mass, similar to when an inorganic antiviral agent is used.

[0041] [Film Thickness] In this embodiment, the thickness (film thickness) of the intermediate layer 13 is preferably in the range of 0.5 μm to 5.0 μm, more preferably in the range of 0.5 μm to 1.5 μm. Having a film thickness of 0.5 μm or more prevents the components of the intermediate layer 13 from migrating to the release layer 12 during coating. The intermediate layer 13 can contain an antiviral agent that can impart excellent antiviral properties to the transfer target. Having a film thickness of 5.0 μm or less prevents the occurrence of clouding when an antiviral agent is added, and can be configured not to interfere with the magnetic output of the magnetic tape attached to the card when used as the surface layer of a card. In other words, having the film thickness of the intermediate layer 13 within the above range more reliably imparts excellent antiviral properties to the transfer target and more reliably maintains the design of the transfer target by preventing clouding of the transfer layer 21. When an article other than a card is used as the transfer target, the film thickness may be designed according to the function of the intermediate layer 13 on the transfer target (improving adhesion, maintaining or improving design, etc.).

[0042] Furthermore, the thickness of the intermediate layer 13 is preferably formed to be thicker than the release layer 12. As a result, the content of the antiviral agent in the transfer layer 21 is higher when the antiviral agent is added to the intermediate layer 13 than when the antiviral agent is added to the layer (release layer) that becomes the outermost surface of the transfer target. This makes it possible to more reliably impart excellent antiviral properties to the transfer target onto which the transfer layer 21 is transferred.

[0043] Each layer of the transfer layer 21 has been described above. Furthermore, in the transfer foil 1 according to this embodiment, the transfer layer 21 may be configured to contain polyethylene wax. More specifically, polyethylene wax may be added to the release layer 12, which forms the outermost surface of the transfer target. This reduces the surface roughness of the transfer layer 21, which forms the outermost layer of the transfer target (e.g., a card), and reduces the frictional resistance at the outermost surface of the transfer target (e.g., a card). This imparts scratch resistance and abrasion resistance to the release layer 12, which forms the outermost surface of a card, and as a result, improves the scratch resistance and abrasion resistance of the transfer target, such as a card, having the release layer 12 as the outermost surface. The content of polyethylene wax in the release layer 12 is preferably within a range of 6 to 10 parts by mass per 100 parts by mass of the resin in the release layer 12. If the content is less than 6 parts by mass, scratch resistance and abrasion resistance cannot be imparted, and if it exceeds 10 parts by mass, whitening of the release layer 12 may occur. By adding polyethylene wax within the above-mentioned range, the transfer target can be imparted with additional scratch resistance and abrasion resistance while maintaining the other functions of the release layer 12 (e.g., transparency, durability, and post-processability). In the transfer foil 1, polyethylene wax may be added to the intermediate layer 13 in addition to the release layer 12. This allows the outermost layer of the transfer target to maintain scratch resistance and abrasion resistance even when the outermost release layer 12 is worn due to aging or other reasons.

[0044] (Manufacturing method) The transfer foil 1 according to this embodiment has the above-described configuration, and the manufacturing method thereof includes the following first and second steps. (1) First step The first step is to form the base sheet 11 using a resin material (for example, a thermoplastic resin). (2) Second process The second step is a step of forming a transfer layer 21 on one surface of the base sheet 11. In the second step, a resin material (e.g., vinyl chloride resin) is applied to one surface of the base sheet 11 to form a release layer 12, and a resin material (e.g., acrylic resin) to which an antiviral agent (e.g., an organic antiviral agent) has been added is applied onto the release layer 12 to form an intermediate layer 13 on the surface side of the transfer layer 21. The method of adding the antiviral agent to the resin material that forms the intermediate layer 13 is not particularly limited. For example, the antiviral agent may be sprayed onto the resin material after coating, or the resin material for the intermediate layer may be prepared by adding the antiviral agent to the resin material and melt-kneading it, or the antiviral agent may be dispersed in the resin material. As such, in this embodiment, the antiviral agent is added only to the intermediate layer 13 when the transfer layer 21 is formed. The release layer 12 and the intermediate layer 13 may be applied by various coating methods such as gravure coating. In this case, it is preferable that the intermediate layer 13 is formed thicker than the release layer 12.

[0045] By using this production method, it is possible to obtain an antiviral transfer foil that imparts excellent antiviral properties to an object to which the transfer is made and that maintains the design of the object to which the transfer is made in a good condition.

[0046] (Effects of the first embodiment) (1) The transfer foil 1 according to this embodiment includes a base sheet 11 and a transfer layer 21 formed on at least one surface of the base sheet 11, and the transfer layer 21 contains an organic antiviral agent. As a result, the transfer foil 1 imparts excellent antiviral properties to the object to be transferred, and the clouding caused by the addition of an antiviral agent is suppressed, so that the design of the object to be transferred can be well maintained. (2) Furthermore, in the transfer foil 1 according to this embodiment, the transfer layer 21 has a release layer 12 that contacts one side of the base sheet 11, and an intermediate layer 13 that is located on the surface side of the transfer layer 21 and is thicker than the release layer 12, and it is preferable that the intermediate layer 13 contains an organic antiviral agent. As a result, the transfer foil 1 reliably imparts excellent antiviral properties to the object to be transferred, and the clouding caused by the addition of the antiviral agent is suppressed, thereby maintaining the design of the object to be transferred well. (3) In the transfer foil 1 according to this embodiment, the intermediate layer 13 preferably contains a resin and an organic antiviral agent, the resin contains an acrylic resin, and the content of the organic antiviral agent is preferably within a range of 10 parts by mass to 30 parts by mass per 100 parts by mass of the resin. As a result, the transfer foil 1 can more reliably impart excellent antiviral properties to the object to be transferred, and the clouding caused by the addition of the antiviral agent is suppressed, thereby better maintaining the design of the object to be transferred.

[0047] (4) In the transfer foil 1 according to this embodiment, the content of the organic antiviral agent in the intermediate layer 13 is preferably within a range of 10 parts by mass to 20 parts by mass per 100 parts by mass of the resin. As a result, the transfer foil 1 can reliably impart even better antiviral properties to the object to be transferred, and the clouding caused by the addition of the antiviral agent is further suppressed, thereby better maintaining the design of the object to be transferred. (5) In the transfer foil 1 according to this embodiment, the thickness of the intermediate layer 13 is preferably in the range of 0.5 μm to 5.0 μm. As a result, the transfer foil 1 can reliably impart even better antiviral properties to the object to be transferred, and the cloudiness caused by the addition of the antiviral agent can be further suppressed, thereby reliably maintaining the design of the object to be transferred better. (6) In the transfer foil 1 according to this embodiment, the transfer layer 21 preferably contains polyethylene wax. As a result, the transfer foil 1 imparts excellent antiviral properties to the object to be transferred, and suppresses cloudiness caused by the addition of an antiviral agent, thereby maintaining the design of the object to be transferred well and imparting scratch resistance and abrasion resistance to the object to be transferred.

[0048] 2. Second embodiment (Configuration of transfer foil 2) In the first embodiment, an example in which the intermediate layer in the transfer layer is composed of a single layer (only one layer) has been described, but the present disclosure is not limited to this. In the present disclosure, the intermediate layer may be composed of more than one layer, i.e., a single layer or a multi-layer of two or more layers. Here, a transfer foil according to a second embodiment of the present disclosure, in which the intermediate layer has a multi-layer structure, will be described with reference to Fig. 2. Fig. 2 is a cross-sectional schematic diagram showing the general configuration of the transfer foil according to the second embodiment of the present disclosure. As shown in Fig. 2, the transfer layer 22 in the transfer foil 2 differs from the transfer layer 21 of the transfer foil 1 according to the first embodiment in that it includes an intermediate layer 130 having a multi-layer structure of two or more layers on a release layer 12 formed on one side of the base sheet 11.

[0049] The following describes the transfer layer 22. Note that the base sheet 11 has the same structure as the transfer foil 1 according to the first embodiment, and therefore its description will be omitted. The transfer layer 22 has a release layer 12 in contact with one surface of the base sheet 11 and an intermediate layer 130 with a multi-layer structure located on the surface side of the transfer layer 22. The release layer 12 has the same structure as the transfer foil 1, so a description thereof will be omitted.

[0050] (Middle layer 130) 2, intermediate layer 130 is made up of n layers (n is an integer of 4 or more), including first intermediate layer 13-1 in contact with release layer 12, second intermediate layer 13-2 laminated in this order on first intermediate layer 13-1, third intermediate layer 13-3, and nth intermediate layer 13-n. Note that the configuration of intermediate layer 130 shown in FIG. 2 is just one example, and intermediate layer 130 may be made up of two or more layers as described above.

[0051] In this embodiment, the intermediate layer 130 preferably contains an antiviral agent (e.g., an organic antiviral agent) in the layer corresponding to the top layer (the layer in contact with the release layer 12) of the multilayer structure after transfer of the transfer layer 21 to the transfer target object, i.e., the first intermediate layer 13-1. Furthermore, in the intermediate layer 130, the antiviral agent may be contained in not only the first intermediate layer 13-1 but also other intermediate layers (such as the second intermediate layer 13-2 and the third intermediate layer 13-3) located below the top layer after transfer. That is, in the transfer foil 2, the intermediate layer 130 preferably contains an organic antiviral agent at least in the first intermediate layer 13-1 that is in contact with the release layer 12. This increases the content of the antiviral agent in the transfer layer 21 of the transfer foil 2, imparting excellent antiviral properties to the transfer target object while maintaining the design of the transfer target object.

[0052] The resin material and film thickness of each layer of the intermediate layer 130 may be configured similarly to those of the intermediate layer 13 of the transfer foil 1 according to the first embodiment. The film thickness of each layer of the multi-layered intermediate layer 130 may be the same or different. Furthermore, the antiviral agent contained in the intermediate layer 130 (more specifically, the first intermediate layer 13-1) may be the same as that of the intermediate layer 13 of the transfer foil 1 according to the first embodiment.

[0053] When the intermediate layer 130 has a multi-layer structure, each intermediate layer may be coated in sequence on the release layer 12 by various coating methods such as gravure coating. Furthermore, for example, in the transfer foil 2, the second intermediate layer formed on the first intermediate layer 13-1, i.e., the second intermediate layer 13-2, may be formed as a pattern layer to which a pattern is added to impart design to the transfer target. The type of pattern is arbitrary depending on the purpose of use, the user's preferences, etc., and various characters, logos, patterns, etc. suitable for the transfer target to which the transfer layer 21 is transferred can be selected.

[0054] When the second intermediate layer 13-2 is a picture pattern layer, a picture can be printed using a urethane resin, for example, by gravure printing. The printing method can be, for example, gravure printing, but is not limited to this. Various printing methods are also applicable, such as offset printing, letterpress printing, flexographic printing, screen printing, inkjet printing, and electrostatic printing. While a urethane resin is used as an example of the printing ink, the ink is not limited to this and can be, for example, a colorant such as an organic or inorganic dye or pigment, or a binder such as a synthetic resin dispersed with appropriate additives such as fillers, tackifiers, plasticizers, stabilizers, dispersants, antifoaming agents, leveling agents, surfactants, and desiccants, as well as solvents or diluents.

[0055] In this way, by making the second intermediate layer 13-2 a picture pattern layer, the transfer foil 2 imparts excellent antiviral properties to the transfer target object, and can maintain and improve the design of the transfer target object. Furthermore, for example, a layer other than the second intermediate layer (e.g., the third intermediate layer 13-3 or the nth intermediate layer 13-n) may be added with a predetermined colorant or the like to form a colored layer. This can further improve the design of the transfer target object.

[0056] (Effects of the second embodiment) (7) In the transfer layer 22 of the transfer foil 2 according to this embodiment, the intermediate layer 130 is preferably a multi-layer structure of two or more layers, and at least the layer in contact with the release layer 12 contains an organic antiviral agent. This increases the content of the antiviral agent in the transfer layer 21 of the transfer foil 2, imparting excellent antiviral properties to the object to be transferred and maintaining the design of the object to be transferred well. In addition, by including a picture pattern layer as an intermediate layer in the multilayer structure, the design of the object to be transferred can be improved.

[0057] 3. Third embodiment (Configuration of transfer foil 3) In the first and second embodiments described above, examples have been described in which an antiviral agent (for example, an organic antiviral agent) is contained only in the intermediate layer of the transfer layer, but the present disclosure is not limited to this. Here, a transfer foil according to a third embodiment of the present disclosure will be described with reference to Fig. 3. Fig. 3 is a cross-sectional schematic diagram illustrating one configuration example of a transfer foil according to the third embodiment of the present disclosure. The transfer layer 23 in the transfer foil 3 differs from the transfer layer 21 in the transfer foil 1 according to the first embodiment and the transfer layer 22 in the transfer foil 2 according to the second embodiment in that an antiviral agent is contained in the release layer 120 formed on one side of the base sheet 11.

[0058] The following describes the transfer layer 23. Note that the base sheet 11 has the same structure as the base sheet 11 of the transfer foil 1 according to the first embodiment, and therefore its description will be omitted. The transfer layer 23 has a release layer 120 in contact with one surface of the base sheet 11, and an intermediate layer 13 located on the surface side of the transfer layer 23. The intermediate layer 13 has the same structure as the transfer foil 1, so a description thereof will be omitted.

[0059] (Release layer 120) The release layer 120 in the transfer layer 23 contains an antiviral agent (for example, an organic antiviral agent). That is, the transfer layer 23 is configured such that the intermediate layer 13 and the release layer 120 contain an antiviral agent. This allows the transfer foil 3 to impart extremely excellent antiviral properties to the transfer target object, while also maintaining the design of the transfer target object in a good condition. The resin material and film thickness of the release layer 120 may be configured similarly to those of the release layer 12 of the transfer foil 1 according to the first embodiment. The antiviral agent contained in the release layer 120 can be the same as that contained in the intermediate layer 13 of the transfer foil 1 according to the first embodiment, and from the viewpoint of suppressing clouding of the transfer layer 23, it is preferable to use an organic antiviral agent.

[0060] Also, in the present embodiment, the content of the organic antiviral agent in the release layer 120 is preferably in the range of 5 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the resin material. Thereby, the transfer foil 3 can surely impart very excellent antiviral properties to the transfer target. Also in the transfer layer 23, the intermediate layer 13 is formed thicker than the release layer 120. Therefore, the content of the antiviral agent with respect to the resin material is higher in the intermediate layer 13 than in the release layer 120. For example, when the content of the antiviral agent in the release layer 120 is X and the content of the antiviral agent in the intermediate layer 13 is Y, "X < Y". That is, the content of the antiviral agent in the transfer layer 23 is dominated by the intermediate layer 13.

[0061] In FIG. 3, an example in which the transfer layer 23 has the release layer 120 and the intermediate layer 13 has been described, but the present disclosure is not limited thereto, and the transfer layer 23 may have a configuration having an intermediate layer 130 instead of the intermediate layer 13. That is, the transfer layer 23 may have a release layer 120 that contacts one surface of the base material sheet 11 and an intermediate layer 130 having a multilayer structure located on the surface layer side of the transfer layer 23. Thereby, the transfer foil 3 can impart very excellent antiviral properties to the transfer target and can improve the designability of the transfer target.

[0062] (Effect of the Third Embodiment) (8) In the transfer layer 23 of the transfer foil 3 according to the present embodiment, it is preferable that the release layer 120 contains an organic antiviral agent. Thereby, the transfer foil 3 can impart very excellent antiviral properties to the transfer target and can maintain the designability of the transfer target well. (9) Also, in the transfer layer 23 of the transfer foil 3 according to the present embodiment, the release layer 120 contains a resin and an organic antiviral agent, the resin contains a vinyl chloride-based resin, and the content of the organic antiviral agent in the release layer 120 is preferably in the range of 5 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the resin. Thereby, the transfer foil 3 can surely impart very excellent antiviral properties to the transfer target.

[0063] 4. Fourth embodiment (Card 100 configuration) A resin card according to a fourth embodiment of the present invention will be described with reference to Figures 4 and 5. Figure 4 is a cross-sectional view illustrating an example of the configuration of a card 100 according to the fourth embodiment of the present invention. The card according to this embodiment is a card-type information recording medium made primarily of resin, and is used as, for example, a commuter pass, a train ticket, an admission ticket, a prepaid card, a credit card, a cash card, a point card, various securities, an identification card, etc.

[0064] (Card configuration) As shown in FIG. 4, the card 100 comprises a card body 105 and a transfer layer 21 that forms the outermost layer of the card body 105. The card body 105 is composed of a core substrate 101 and an exterior sheet 102 provided on at least one surface of the core substrate. More specifically, the card 100 comprises the core substrate 101, the exterior sheet 102 provided on at least one surface of the core substrate 101, and a transfer layer 21 of a transfer foil 1 provided on the surface of the exterior sheet 102 opposite to the core substrate 101. As will be described in detail later, the transfer layer 21 is transferred from the transfer foil 1 according to the first embodiment onto the surface of the exterior sheet 102 during the manufacture of the card 100. The transfer layer transferred onto the surface of the exterior sheet 102 is not limited to the transfer layer 21 of the transfer foil 1 according to the first embodiment. The transfer layer 22 of the transfer foil 2 according to the second embodiment may be transferred onto the card body 105, or the transfer layer 23 of the transfer foil 3 according to the third embodiment may be transferred onto the card body 105. In other words, the card 100 can have any one of the transfer layers 21, 22, or 23 as the outermost layer.

[0065] The card 100 according to this embodiment has excellent antiviral properties due to a configuration in which a transfer layer 21 is laminated on the surface of an exterior sheet 102 provided on at least one surface of a core substrate 101. In this disclosure and this specification, a card to which antiviral properties are imparted by using an antiviral transfer layer 21 as the outermost layer is referred to as an "antiviral card." Furthermore, as described above, the transfer layer 21 is prevented from becoming cloudy due to the addition of an antiviral agent. This improves the visibility of, for example, printed content on the core substrate 101 or the exterior sheet 102, thereby maintaining the design of the card 100. While FIG. 4 shows an example configuration in which the exterior sheet 102 is formed on both the front and back surfaces of the core substrate 101, the present disclosure is not limited thereto, and the exterior sheet 102 may be provided on one surface of the core substrate. The following describes the manufacturing process of the card body 105 (core substrate 101, exterior sheet 102) and the card 100. Note that the transfer layer 21 is the same as the transfer layer 21 of the transfer foil 1 according to the first embodiment, and therefore its description will be omitted.

[0066] (Core substrate 101) The core substrate 101 of the card 100 can be made of a thermoplastic resin, similar to the substrate sheet 11 of the transfer foil 1, for example. The thermoplastic resin used for the core substrate 101 is not particularly limited, and examples thereof include polyolefin resins such as polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, ethylene-α-olefin copolymer, and propylene-α-olefin copolymer; polyolefin-based resins such as olefin-based copolymer resins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer); and polyethylene terephthalate, glycol-modified polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, and 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate. Examples of the resin that can be used include polyester resins such as acrylate, polyarylate, and polycarbonate; acrylic resins such as poly(meth)acrylonitrile, polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, and polyacrylamide; polyamide resins such as 6-nylon, 6,6-nylon, and 6,10-nylon; styrene resins such as polystyrene, AS resin, and ABS resin; vinyl resins such as polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, and vinyl chloride-vinyl acetate copolymer; and fluorine-containing resins such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, and ethylene-perfluoroalkyl vinyl ether copolymer, as well as mixtures, copolymers, composites, and laminates of two or more of these resins.

[0067] In this embodiment, polyethylene terephthalate (PET) or polyvinyl chloride (PVC), which are thermoplastic resins, can be suitably used as core substrate 101 for a general card.

[0068] (Exterior sheet 102) The exterior sheet 102 of the card 100 is a resin film that covers the surface of the core substrate 101, and is formed, for example, by being pressed onto the core substrate 101. By providing the exterior sheet 102 on at least one surface of the core substrate 101, the durability of the surface of the card body 105 is improved, and the print is protected, and the adhesion to the transfer layer 21 is improved.

[0069] The exterior sheet 102 can be made of, for example, the same thermoplastic resin as that of the core substrate 101. Of the thermoplastic resins, polyethylene terephthalate (PET) is preferably used as the material for the exterior sheet 102. When polyethylene terephthalate is used as the material for the exterior sheet 102, for example, transparent biaxially oriented PET may also be used. In addition, in Figure 4, a transfer layer 21 is provided on one surface of the exterior sheet 102, but the present disclosure is not limited to this, and for example, a transfer layer 21 may be provided on both surfaces of the exterior sheet 102 provided on both sides of the core substrate 101.

[0070] The thickness of the card 100, including the core substrate 101, exterior sheet 102, and transfer layer 21, is preferably within the range of card thickness (680 μm or more and 840 μm or less) specified in the JIS standard (JISX6301:2005). Therefore, taking the thickness of the transfer layer 21 into consideration, the thickness of the card body 105 (core substrate 101, exterior sheet 102) can be appropriately designed so that the thickness of the card 100 falls within this range. The thickness of the exterior sheet 102 is preferably within the range of 40 μm or more and 60 μm or less. When the thickness of the exterior sheet 102 is 40 μm or more, the coating finish of the exterior sheet 102 can be improved. Furthermore, when the thickness of the exterior sheet 102 is 60 μm or less, the exterior sheet 102 is not formed thicker than necessary, improving the processing suitability during manufacturing of the core substrate 101 to which the exterior sheet 102 is attached, and reducing the manufacturing cost of the exterior sheet 102. The exterior sheet 102 may also have a multi-layer structure in which a surface layer is formed on a base sheet (the above-mentioned thermoplastic resin) to provide functions such as scratch resistance, abrasion resistance, and stain resistance. Moreover, the exterior sheet 102 preferably has a transparency (colorless transparent, colored transparent, translucent) that allows the printed content (characters, patterns, pictures, etc.) on the core substrate 101 to be seen through.

[0071] (Card 100 manufacturing method) The card 100 according to this embodiment has the above-mentioned configuration, and its manufacturing method includes the following first and second steps.

[0072] (1) First step The first step is to provide an exterior sheet 102 on at least one surface of the core substrate 101 . In the first step, the exterior sheet 102 is pressed onto the surface of the core substrate 101 by a laminating press, and the core substrate 101 and the exterior sheet 102 are bonded together. As a result, the card body 105 is produced as a laminate of the core substrate 101 and the exterior sheet 102. In the manufacturing process of the card 100, a press employing a multi-stage lamination method may be used during lamination. In addition, in the manufacturing process of the card 100, for example, after lamination, magnetic tape transfer formation or hologram processing (for example, printing or sticker attachment) may be performed on the exterior sheet 102 formed on the surface of the card body 105.

[0073] (2) Second process The second step is a step of transferring the transfer layer 21 of the transfer foil 1 onto the surface of the exterior sheet 102 opposite to the core substrate 101 . As described above, the transfer layer 21 in the transfer foil 1 has the release layer 12 in contact with one surface of the base sheet 11, and the intermediate layer 13 located on the surface side of the transfer layer 21 and thicker than the release layer 12, and the intermediate layer 13 contains an organic antiviral agent. In the second step, the transfer layer 21 is transferred onto the exterior sheet 102 by laminating the intermediate layer 13 in a state where it is in contact with the surface of the exterior sheet 102.

[0074] In the second step, the transfer layer 21 of the transfer foil 1 is transferred to the surface of the exterior sheet 102 opposite the core substrate 101 by heat and pressure in a laminating press, and a card 100 is produced in which the transfer layer 21 covers the surface of the card body 105.

[0075] The second step will now be described in detail with reference to Fig. 5. Fig. 5(a) is a cross-sectional view showing the card body 105 and the transfer foil 1 at the start of lamination in the second step, and Fig. 5(b) is a cross-sectional view showing the card 100 in which the transfer layer 21 has been transferred to the card body 105 by lamination.

[0076] As shown in FIG. 5(a), at the start of the second step, i.e., at the start of lamination, the transfer foil 1 is placed on one surface (exterior sheet 102) of the card body 105. At this time, the transfer foil 1 is placed with the intermediate layer 13 in contact with the surface of the exterior sheet 102 opposite the core substrate 101. Next, heat and pressure are applied to the card body 105 and transfer foil 1 shown in FIG. 5(a) to perform lamination. As with the first step, a press machine employing a multi-stage lamination method may be used for lamination in the second step.

[0077] 5(b), by performing the lamination process under heat and pressure, the base sheet 11 and the release layer 12 in the transfer layer 21 of the transfer foil 1 are peeled off at the interface, and the transfer layer 21 is pressure-bonded to the surface of the card body 105, i.e., the exterior sheet 102. As a result, the transfer layer 21 is transferred to the surface of the card body 105, and a card 100 is produced in which the transfer layer 21 is the outermost layer. In this way, the transfer layer 21 becomes the outermost layer of the card 100, the peeling layer 12 becomes the outermost surface of the card 100, and the intermediate layer 13 is positioned between the peeling layer 12 and the surface of the card main body 105 (exterior sheet 102).

[0078] By using such a production method, it is possible to obtain an antiviral card using an antiviral transfer foil that imparts excellent antiviral properties to an object to which the transfer is made and that maintains the design of the object to which the transfer is made well. In the manufacturing method of the card 100 according to this embodiment, during the lamination process in the second step, in which heat and pressure are applied, the antiviral agent (e.g., an organic antiviral agent) contained in the intermediate layer 13 bleeds (diffuses) into the release layer 12. That is, the antiviral agent contained in the intermediate layer 13 in the transfer layer 21 of the transfer foil 1 remains in the intermediate layer 13 when the intermediate layer 13 is applied onto the release layer 12 by gravure coating, and bleeds into the release layer 12 when lamination is performed on the surface of the card body 105. As a result, the antiviral agent is sufficiently distributed on the outermost surface (release layer 12) of the transfer target after transfer of the transfer layer 21, and comes into contact with viruses adhering to the transfer target when the transfer target is used, thereby exhibiting excellent antiviral effects.

[0079] Furthermore, the manufacturing method of the card 100 in the present disclosure is not limited to this, and it is also possible to form the exterior sheet 102 on the core substrate 101 and transfer the transfer layer 21 onto the exterior sheet 102 in a single lamination process. In this case, the core substrate 101, exterior sheet 102, and transfer foil 1 may be laminated as shown in FIG. 5(a), and the lamination process may be performed using a press machine that employs a multi-stage lamination method, for example. This simplifies the manufacturing process of the card 100.

[0080] <Example>

[0081] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0082] Example 1 (transfer foil) A 0.5 μm thick release layer made of vinyl chloride resin (manufactured by Toyo Ink Co., Ltd.) was formed by gravure coating on a 75 μm thick substrate sheet made of polyethylene terephthalate (PET). 7 parts by mass of polyethylene wax (Versaflow, manufactured by Shamrock Technologies) was added to the release layer per 100 parts by mass of polyester resin. Furthermore, an intermediate layer containing an acrylic resin (manufactured by Toyo Ink Co., Ltd.) and an organic antiviral agent was formed on the release layer by gravure coating to a thickness of 1.0 μm. The organic antiviral agent used was "Wiltaker VM" manufactured by Sekisui Material Solutions Co., Ltd. The content of the organic antiviral agent in the intermediate layer was 10 parts by mass per 100 parts by mass of the resin. This resulted in a transfer foil according to Example 1.

[0083] (card) The card body was formed by laminating a polyvinyl chloride core substrate with a polyethylene terephthalate (PET) exterior sheet on both sides using a laminating press. The core substrate had a thickness of 0.685 mm. Furthermore, the above-mentioned transfer foil was placed on one surface of the card body (the surface of the exterior sheet), and the transfer layer (the release layer and the intermediate layer) was transferred to the card body by a laminating press. At this time, the transfer layer was transferred so that the release layer was the outermost surface of the card body. In this way, the card according to Example 1 was obtained. The laminating press was carried out under the following laminating conditions. (Lamination conditions) Laminate material (core substrate): Polyvinyl chloride (PVC) Lamination method: multi-stage lamination press Heating temperature: 110 degrees or more and 130 degrees or less Processing time: heating 50 minutes, cooling 20 minutes

[0084] <Example 2> A transfer foil and a card according to Example 2 were produced in the same manner as in Example 1, except that the content of the organic antiviral agent in the intermediate layer was changed to 20 parts by mass per 100 parts by mass of the resin. Example 3 A transfer foil and a card according to Example 3 were produced in the same manner as in Example 1, except that the content of the organic antiviral agent in the intermediate layer was changed to 30 parts by mass per 100 parts by mass of the resin.

[0085] Example 4 In addition to the intermediate layer, the same organic antiviral agent as in the intermediate layer was also added to the release layer. The content of the organic antiviral agent in the release layer was 5 parts by mass per 100 parts by mass of the resin. A transfer foil and a card according to Example 4, which contained an antiviral agent in the release layer and intermediate layer, were produced in the same manner as in Example 1 except for the above. <Example 5> A transfer foil and a card according to Example 5 were produced in the same manner as in Example 4, except that the content of the organic antiviral agent in the intermediate layer was changed to 20 parts by mass per 100 parts by mass of the resin. Example 6 The intermediate layer had a two-layer structure. The two intermediate layers were the same as in Example 1, except that the content of the organic antiviral agent in each was 20 parts by mass per 100 parts by mass of the resin. A transfer foil and a card according to Example 6 were produced in the same manner as in Example 4.

[0086] <Comparative Example 1> An exterior sheet and a card according to Comparative Example 1 were produced in the same manner as in Example 1, except that no antiviral agent was added to either the intermediate layer or the release layer.

[0087] <Comparative Example 2> No antiviral agent was added to the intermediate layer, and an organic antiviral agent was added only to the release layer. The content of the organic antiviral agent in the release layer was 5 parts by mass per 100 parts by mass of the resin. A transfer foil and a card according to Comparative Example 2 were produced in the same manner as in Example 1. <Comparative Example 3> The content of the organic antiviral agent in the release layer was 10 parts by mass relative to 100 parts by mass of the resin. Otherwise, a transfer foil and a card according to Comparative Example 3 were produced in the same manner as in Comparative Example 2. <Comparative Example 4> The content of the organic antiviral agent in the release layer was 15 parts by mass relative to 100 parts by mass of the resin. Otherwise, a transfer foil and a card according to Comparative Example 4 were produced in the same manner as in Comparative Example 2. <Comparative Example 5> The content of the organic antiviral agent in the release layer was 20 parts by mass relative to 100 parts by mass of the resin. Otherwise, a transfer foil and a card according to Comparative Example 5 were produced in the same manner as in Comparative Example 2. <Comparative Example 6> The content of the organic antiviral agent in the release layer was 40 parts by mass relative to 100 parts by mass of the resin. Otherwise, a transfer foil and a card according to Comparative Example 6 were produced in the same manner as in Comparative Example 2.

[0088] <Evaluation> [Antiviral performance] The cards of Examples 1 to 6 and Comparative Examples 1 to 6 were subjected to antiviral tests in accordance with ISO 21702. A 50 mm square test sample was placed in a sterile petri dish, and 0.4 mL of a virus solution was inoculated onto the sample. The virus solution used here was a virus solution containing feline calicivirus. The sample was then covered with a 40 mm square polyethylene film. After the petri dish was covered with a lid, the sample and virus were inoculated under conditions of a temperature of 25°C and a humidity of 90% or higher. After a predetermined time (24 hours), 10 mL of SCDLP medium was poured into the petri dish to wash out the virus. The virus infectivity of the washed-out solution was measured using the plaque method. <Measurement of virus infectivity (plaque method)> Host cells were cultured in monolayer on a 6-well plate, and 0.1 mL of serially diluted washout solution was inoculated into each well. After incubation for 1 hour at 37°C in 5% CO2, the virus was allowed to adsorb to the cells. After that, agar medium was poured into the 6-well plate and incubated for an additional 2-3 days. After incubation, the cells were fixed and stained, and the number of plaques formed was counted. <Calculation of virus infectivity> According to the following formula, 1cm of sample 2 The viral infectivity per 1000 cells was calculated. V = (10 × C × D × N) / A V: 1cm sample 2 Viral infectivity per (PFU / cm 2 ) C: Number of plaques measured D: Dilution ratio of the well in which the plaques were counted N: SCDLP amount A: Contact area between sample and virus (area of polyethylene film) <Calculation of antiviral activity value> The antiviral activity value was calculated according to the following formula. Antiviral activity value = log(Vb) - log(Vc) Log(Vb): 1cm of unprocessed sample after 24 hours 2 Common logarithm of viral infectivity per Log(Vc): 1cm of antiviral treated sample after 24 hours 2 Common logarithm of viral infectivity per The calculated antiviral activity values were evaluated using the following three levels: ◎, ◯, ×. <Evaluation criteria> ◎: Antiviral activity value 3 logs 10 If it is more than 〇: Antiviral activity value 2 logs 10 If it is more than ×: Antiviral activity value 2log 10 If it is less than

[0089] [Design] After producing each of the cards in Examples 1 to 6 and Comparative Examples 1 to 6, the presence or absence of cloudiness in the appearance was visually inspected, and a sensory evaluation was made on a three-level scale of "good", "fair", and "bad" according to the following criteria. <Evaluation criteria> 〇: No cloudiness is observed on the card exterior △: Some cloudy areas are observed on the card exterior. ×: Cloudiness is observed in the appearance of the card

[0090] The evaluation results above, along with the composition of the transfer foil, are shown in Table 1. In Table 1, the notation "-" indicates that no antiviral agent was added to the corresponding layer. In the above evaluation results, "◎", "〇", and "△" are considered to be pass, and "×" is considered to be fail. In addition, as a comprehensive judgment, if all of the above evaluation results are "△" or higher, it is considered to be "〇" (pass), and if there is even one "×" in the above evaluation results, it is considered to be "×" (fail). [Table 1]

[0091] As shown in Table 1, the evaluation results for antiviral properties of the cards of Examples 1 to 6 were all "good" or better (pass). That is, it was found that the transfer foils of Examples 1 to 6 can impart excellent antiviral properties to the cards that are the objects to which the transfer is made. Furthermore, the evaluation of design properties of the cards onto which the transfer foils of Examples 1 to 6 were all "good" or better (pass). That is, it was found that the transfer foils of Examples 1 to 6 can well maintain the design properties of the cards that are the objects to which the transfer is made. On the other hand, the antiviral evaluation results for the cards of Comparative Examples 1 to 5 were all "×" (fail). That is, it was found that the transfer foils of Comparative Examples 1 to 5 could not impart sufficient antiviral properties to the cards that were the transfer target. Furthermore, the design evaluations for the cards of Comparative Examples 4 to 6 were "△" or "×," which were lower than those for Examples 1 to 6. That is, it was found that when more than 10 parts by mass of the antiviral agent per 100 parts by mass of the resin in the release layer was added, the transfer layer became cloudy, reducing the design of the transfer target.

[0092] In other words, it was found that a transfer foil containing an antiviral agent (e.g., an organic antiviral agent) in the intermediate layer of the transfer layer imparts excellent antiviral properties to the object to which the transfer is made and also maintains the design of the object to which the transfer is made well. Furthermore, it is presumed that the difference in the antiviral evaluation (antiviral activity value) between Examples 4 to 6 compared to Examples 1 to 3 is due to the influence of the presence of multiple layers to which an antiviral agent is added. In other words, the transfer foils of Examples 4 to 6 have more layers to which an antiviral agent is added than Examples 1 to 3, which is presumed to be advantageous in the antiviral evaluation. Furthermore, it has been confirmed that the cards according to Examples 1 to 6 exhibit excellent antiviral properties comparable to those shown in Table 1, even when a virus liquid containing influenza virus was used for antiviral evaluation.

[0093] The transfer foil and antiviral card of the present invention are not limited to the above-described embodiments and examples, and various modifications are possible within the scope of the invention without impairing its features. [Explanation of symbols]

[0094] 1, 2, 3 Transfer foil 11 Base sheet 12, 120 peeling layer 13, 130 Middle class 21, 22, 23 Transfer layer 100 cards 101 Core substrate 102 Exterior sheet 105 Card body

Claims

1. A base sheet; a transfer layer formed on one surface of the base sheet, The transfer layer is a release layer in contact with the one surface of the base sheet; and an intermediate layer located on the surface side of the transfer layer and thicker than the release layer, Only the intermediate layer of the transfer layer contains only an organic antiviral agent as an antiviral agent. An antiviral transfer foil characterized by:

2. A substrate sheet, a transfer layer formed on one surface of the base sheet, The transfer layer is a release layer in contact with the one surface of the base sheet; and an intermediate layer located on the surface side of the transfer layer and thicker than the release layer, The intermediate layer and the release layer contain an organic antiviral agent, the content of the organic antiviral agent in the release layer is within a range of 5 parts by mass or more and 20 parts by mass or less relative to 100 parts by mass of resin, The thickness of the release layer is 1.0 μm or less. An antiviral transfer foil characterized by:

3. the intermediate layer contains a resin and the organic antiviral agent, the resin includes an acrylic resin, The content of the organic antiviral agent is in the range of 10 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the resin.

3. The antiviral transfer foil according to claim 1 or 2.

4. The content of the organic antiviral agent in the intermediate layer is in the range of 10 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the resin.

4. The antiviral transfer foil according to claim 3.

5. The thickness of the intermediate layer is in the range of 0.5 μm to 5.0 μm. The antiviral transfer foil according to any one of claims 1 to 4.

6. The intermediate layer is one or more layers, and at least the layer in contact with the release layer contains the organic antiviral agent. The antiviral transfer foil according to any one of claims 1 to 5.

7. The release layer contains a vinyl chloride resin and the organic antiviral agent.

3. The antiviral transfer foil according to claim 2.

8. The thickness of the release layer is in the range of 0.2 μm to 1.0 μm. The antiviral transfer foil according to any one of claims 1 to 7.

9. The transfer layer contains polyethylene wax. The antiviral transfer foil according to any one of claims 1 to 8.

10. A core substrate; An exterior sheet provided on at least one surface of the core substrate; The transfer layer of the antiviral transfer foil according to any one of claims 1 to 9 is provided on the surface of the exterior sheet opposite to the core substrate. An antiviral card characterized by:

11. forming a base sheet using a first resin material; forming a transfer layer on one surface of the base sheet, In the step of forming the transfer layer, a second resin material is applied to one surface of the base sheet to form a release layer, and a third resin material containing an organic antiviral agent is applied to the release layer to form an intermediate layer; Only the intermediate layer of the transfer layer contains the organic antiviral agent as the antiviral agent. A method for producing an antiviral transfer foil.

12. providing an exterior sheet on at least one surface of the core substrate; A step of transferring a transfer layer of a transfer foil to a surface of the exterior sheet opposite to the core substrate; Equipped with The transfer layer in the transfer foil has a release layer in contact with one surface of the base sheet, and an intermediate layer located on the surface side of the transfer layer and thicker than the release layer, only the intermediate layer of the transfer layer contains only an organic antiviral agent as an antiviral agent, In the step of transferring the transfer layer, lamination is performed in a state in which the intermediate layer is in contact with the surface of the exterior sheet, and the transfer layer is transferred onto the exterior sheet. A method for producing an antiviral card.

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