JP2015074146A - Medium protective ribbon, method for producing medium protective ribbon and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the intrusion of an image formed on a recording medium by a sublimation type thermal transfer system, and also, to prevent the storage of the adhesive strength of a protective layer to the image formed on the recording medium.SOLUTION: Provided is a medium protective ribbon 1 thermally transferred to a recording medium on which an image is formed by a thermal fusion type thermal transfer system and a sublimation type thermal transfer system, including an adhesive layer 15, an ultraviolet cut layer 14 and a protective layer 13 of protecting the recording medium. The adhesive layer is provided on the image, does not include a plasticizer and also includes an acrylic ester copolymer whose glass transition point is equal to or less than the thermal transfer temperature when the medium protective ribbon is heated and is thermally transferred to the recording medium. The ultraviolet cut layer and the protective layer are laminated on the adhesive layer.

Description

  Embodiments described herein relate generally to a medium protection ribbon, a method for manufacturing the medium protection ribbon, and a recording medium.

  Personal authentication media such as ID cards, employee ID cards, and ID cards have face images (photo images) and description information (character images) printed on the surface. Many personal authentication media are covered with a transparent protective layer in order to protect the entire surface of the personal authentication medium from damage and deterioration, and particularly in the face image portion, to protect against fading due to ultraviolet rays. It is covered with a UV protection layer. The protective layer and the ultraviolet cut layer protect the personal authentication medium by transferring (adhering) the protective layer and the ultraviolet cut layer into a ribbon shape onto the personal authentication medium.

  By the way, the personal authentication medium generally has an image receiving layer on the entire surface of the personal authentication medium, and a common part such as a company logo is printed on the image receiving layer using ultraviolet curable ink. And the like are printed by melt printing, and the face image is printed by sublimation printing. The protective layer covering the entire surface of the personal authentication medium is printed by an image receiving layer, a portion printed using ultraviolet curable ink (ultraviolet curable ink portion), a portion printed by melt printing (melt printed portion), and sublimation printing. It is necessary to adhere to the personal authentication medium using an adhesive layer that can be fixed to the portion (sublimation printing portion). Typical examples of the adhesive layer used for adhesion of the protective layer to the personal authentication medium include a vinyl chloride / vinyl acetate copolymer and ethylene vinyl acetate.

  However, since a plasticizer is contained in an adhesive layer such as a copolymer of vinyl chloride and vinyl acetate or ethylene vinyl acetate, if the adhesive layer touches the sublimation printing portion, the sublimation printing portion is affected. . Therefore, after protecting the sublimation printing part from the plasticizer by adhering the UV cut layer to the sublimation printing part using an acrylic adhesive layer having excellent fixing properties and no plasticizer, the vinyl chloride and vinyl acetate A technique is disclosed in which a personal authentication medium is covered with an ultraviolet cut layer and a protective layer by a two-step adhesion process in which a protective layer is adhered to the entire surface of the personal authentication medium using an adhesive layer such as a copolymer or ethylene vinyl acetate.

JP 2002-64209 A

  However, in the prior art, in order to cover the personal authentication medium with the ultraviolet cut layer and the protective layer, a two-step adhesion process is required. Therefore, a printing machine that performs printing on the personal authentication medium has an ultraviolet cut layer. Two devices are required: a device that adheres to the personal authentication medium and a device that adheres the protective layer to the personal authentication medium. In addition, two types of ribbons are required for each of the protective layer and the ultraviolet cut layer.

  The medium protective ribbon according to the embodiment is thermally transferred to a recording medium on which an image is formed by a thermal melting type thermal transfer system and a sublimation type thermal transfer system, and includes an adhesive layer, an ultraviolet cut layer, and a protective layer for protecting the recording medium. Prepare. The adhesive layer is provided on the image and contains an acrylic ester copolymer that does not contain a plasticizer and has a glass transition point equal to or lower than the thermal transfer temperature when the medium protective ribbon is heated and thermally transferred to the recording medium. The ultraviolet cut layer and the protective layer are laminated on the adhesive layer.

FIG. 1 is a cross-sectional view of a medium protection ribbon according to the present embodiment. FIG. 2 is a cross-sectional view of the recording medium according to the present embodiment. FIG. 3 is a diagram for explaining an operation of forming an image on a recording medium and an operation of adhering a medium protection ribbon to the recording medium by the recording medium manufacturing apparatus according to the present embodiment. FIG. 4 is a diagram showing the adhesion of the ultraviolet cut film layer and the protective film layer to the recording medium and the fading resistance of the sublimation printing portion when the adhesive layers shown in the examples and comparative examples are used.

  Hereinafter, a medium protection ribbon, a method for manufacturing a medium protection ribbon, and a recording medium according to the present embodiment will be described with reference to the accompanying drawings.

  First, the configuration of the medium protection ribbon and the recording medium according to the present embodiment will be described. FIG. 1 is a cross-sectional view of a medium protection ribbon according to the present embodiment. FIG. 2 is a cross-sectional view of the recording medium according to the present embodiment.

  In the recording medium 2 according to the present embodiment, an image is formed by at least a heat melting type thermal transfer method and a sublimation type thermal transfer method, such as personal authentication media such as ID cards and IC built-in cards, securities, stock certificates, and vouchers. The In the present embodiment, the recording medium 2 includes a card substrate 21 and an image receiving layer 22 as shown in FIG. The card substrate 21 is a plastic or paper support.

  In the image receiving layer 22, an image such as a first image G1 such as a photographic image by a sublimation type thermal transfer method, a second image G2 such as a character image by a thermal melting type thermal transfer method, and a third image G3 by an ultraviolet curable ink are formed. Is done. In the present embodiment, the image receiving layer 22 is made of a material having good adhesion to the meltable ink used in the thermal melting type thermal transfer system and the sublimation ink used in the sublimation type thermal transfer system.

  Specifically, a thermoplastic resin such as a vinyl chloride resin, a polyester resin, a phenoxy resin, a polyvinyl butyral resin, or a polyacetal resin is used for the image receiving layer 22. Further, the image receiving layer 22 may be obtained by adding an isocyanate compound or the like to a thermoplastic resin such as a vinyl chloride resin, a polyester resin, a phenoxy resin, a polyvinyl butyral resin, or a polyacetal resin. Further, the image receiving layer 22 may be made of a thermoplastic resin such as vinyl chloride resin, polyester resin, phenoxy resin, polyvinyl butyral resin, polyacetal resin and the like to which a release agent such as silicone is added.

  The medium protection ribbon 1 is thermally transferred (adhered) to the recording medium 2 on which the first image G1 and the second image G2 are formed by at least a sublimation type thermal transfer system and a thermal melting type thermal transfer system. In the present embodiment, the medium protective ribbon 1 includes a transfer substrate 11, a release layer 12, a protective film layer 13, an ultraviolet cut film layer 14, and an adhesive layer 15, as shown in FIG. ing.

  The adhesive layer 15 is provided on the image formed on the recording medium 2 (image receiving layer 22), does not contain a plasticizer, and the glass transition point Tg is used when the medium protective ribbon 1 is heated and thermally transferred to the recording medium 2. It is composed of an acrylate copolymer having a temperature equal to or lower than the thermal transfer temperature (effective thermal transfer temperature when the medium protection ribbon 1 is thermally transferred to the recording medium 2). Thereby, the plasticizer contained in the adhesive layer 15 can prevent the first image G1 formed on the image receiving layer 22 by the sublimation thermal transfer method from being attacked. Further, the acrylic ester copolymer constituting the adhesive layer 15 has a glass transition point Tg equal to or lower than the thermal transfer temperature when the medium protective ribbon 1 is heated and thermally transferred to the recording medium 2. Therefore, the image formed on the image receiving layer 22 (particularly, the second image G2 formed by the heat melting type thermal transfer method, the third image formed by the ultraviolet curing method (ultraviolet curable ink)). Insufficient adhesion to the image G3) can be prevented. In the present embodiment, when a thermoplastic resin (for example, a polyester resin) is used for the recording medium 2 (image receiving layer 22), the adhesive layer 15 does not melt the recording medium 2 (image receiving layer 22) and the medium protective ribbon 1 Is an acrylic ester copolymer having a glass transition point not higher than the upper limit temperature (the glass transition point of the thermoplastic resin used for the image receiving layer 22, for example, the glass transition point of polyester resin 80 ° C.). In the present embodiment, the adhesive layer 15 is heated at a temperature of about 100 ° C. for 2 to 3 seconds to heat the medium protection ribbon 1 to thermally transfer the medium protection ribbon 1 to the recording medium 2. It is comprised with the acrylate ester copolymer which has a glass transition point (for example, 50 degreeC).

  In the present embodiment, if the thickness of the adhesive layer 15 is less than 0.5 μm, sufficient adhesion tends to be impossible, and if it exceeds 10 μm, the winding diameter of the medium protection ribbon 1 increases and costs increase. The thickness is 5 to 10 μm.

  The protective film layer 13 (an example of a protective layer) is laminated on the adhesive layer 15 to protect the recording medium 2. In the present embodiment, the protective film layer 13 is, for example, a thermoplastic resin and a photocurable resin blended at a weight ratio of 20:80 to 80:20, and a photopolymerization of 0.1 to 20 parts by weight in a solid content ratio. A protective layer coating solution containing an initiator or the like is applied onto the transfer substrate 11 and dried, and then cured in advance by light irradiation.

  As the thermoplastic resin used for the protective film layer 13, a highly transparent resin can be used. For example, a polyester resin, a polyurethane resin, an acrylic resin, an epoxy resin, a polyvinyl alcohol resin, a polyvinyl butyral resin. , Vinyl acetate resins, ethylene-vinyl acetate resins, and mixtures of these resins can be used. The molecular weight of the thermoplastic resin used for the protective film layer 13 is 1,000 to 25,000, which is less likely to generate burrs when transferred to the recording medium 2 and has good cutting properties.

  As the photocurable resin used for the protective film layer 13, a material having a bifunctional acrylate or bifunctional methacrylate and a trifunctional or higher polyfunctional acrylate or methacrylate can be used.

As the bifunctional acrylate or bifunctional methacrylate, those having dimethylmethylene (A) represented by the following chemical formula can be used.

  As the bifunctional acrylate or bifunctional methacrylate, those having a bisphenol A type or bisphenol F type skeleton can be used.

  Examples of the trifunctional or higher polyfunctional acrylate or methacrylate include pentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and dipentaerythritol tetramethacrylate. Acrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, dipentaerythritol pentamethacrylate, pentaerythritol polyacrylate, dipentaerythritol polyacrylate, and the like can be used. These trifunctional or higher functional ultraviolet curable compounds may be a mixture of a plurality of compounds.

  Examples of the photopolymerization initiator that can be used include benzophenones, acetophenones, benzoins, thioxanthones, azo compounds, Michler's ketone, benzyl, benzoin alkyl ether, benzyl dimethyl ketal, and tetramethyl thiuram monosulfide.

  As described above, the thermoplastic resin and the photocurable resin are blended at a weight ratio of 20:80 to 80:20. In order to improve the flexibility of the protective film layer 13 after being transferred to the recording medium 2, the blending ratio of the thermoplastic resin is increased within the range of the weight ratio of 20:80 to 80:20. In order to improve the fastness of the protective film layer 13 after the transfer, the blending ratio of the photocurable resin is increased within the range of the weight ratio of 20:80 to 80:20.

  Among the photocurable resins, the blending ratio of the bifunctional acrylate or bifunctional methacrylate to the trifunctional or higher polyfunctional acrylate or polyfunctional methacrylate can be blended at a ratio of 97: 3 to 50:50. And in order to further improve the flexibility of the protective film layer 13 after transfer to the recording medium 2, the blending ratio of the bifunctional acrylate or the bifunctional methacrylate is increased within the range of 97: 3 to 50:50, In order to improve the fastness of the protective film layer 13 after being transferred to the recording medium 2, the blending ratio of the polyfunctional acrylate or the polyfunctional methacrylate having 3 or more functionalities is increased within the range of 97: 3 to 50:50. .

  The bifunctional acrylate or bifunctional methacrylate material is flexible if it is a bifunctional acrylate or bifunctional methacrylate, but in order to further improve the flexibility, a material having dimethylmethylene in the skeleton and a bisphenol A type Alternatively, at least one of materials having an F-type skeleton is used.

  A trifunctional or higher polyfunctional acrylate or polyfunctional methacrylate has a fastness if it is a trifunctional or higher polyfunctional acrylate or polyfunctional methacrylate, but in order to further improve the fastness, a material having a plurality of erythritol groups Is used. Furthermore, a material having pentaerythritol as a skeleton is used.

  The thickness of the protective film layer 13 varies depending on the thickness, material, and type of the recording medium 2 to which the medium protective ribbon 1 is transferred, but is 0.1 to 50 μm from the viewpoint of both flexibility and robustness of the recording medium 2. To do. In addition, the thickness of the protective film layer 13 is such that when the medium protective ribbon 1 is stored in a roll, the hardened photo-curing resin is less prone to cracks such as cracks, and more burrs are generated during thermal transfer. In consideration of suppressing and further improving the robustness of the protective film layer 13, the thickness is set to 3 to 30 μm.

  The ultraviolet cut film layer 14 is composed of an ultraviolet absorber or the like, and is laminated on the adhesive layer 15. In the present embodiment, the ultraviolet cut film layer 14 is provided between the protective film layer 13 and the adhesive layer 15.

  The transfer substrate 11 (an example of a support) is formed by laminating an adhesive layer 15, an ultraviolet cut film layer 14, and a protective film layer 13. In this embodiment, the transfer substrate 11 is made of various plastic films such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, cellulose, polypropylene, polyethylene, polystyrene, polyvinyl chloride, and the like. For the transfer substrate 11, a resin film with low transparency such as polyimide or polysulfone can be used because it can transmit ultraviolet rays or the like if the film is thin. Further, the transfer substrate 11 has a thickness in the range of 1 to 200 μm. In addition, the transfer substrate 11 is curled by heat if the transfer substrate 11 is too thin, and the point that a large amount of heat is required if the transfer substrate 11 is too thick. And it is good also as a range of 5-50 micrometers.

  The release layer 12 is laminated on the transfer substrate 11. In the present embodiment, the release layer 12 is provided between the transfer substrate 11 and the protective film layer 13. Thereby, the protective film layer 13 can be easily peeled off from the transfer substrate 11. In addition, the thickness of the release layer 12 is 0.1 to 30 μm from the viewpoint of the minimum thickness necessary for realizing the peelability of the protective film layer 13 from the transfer substrate 11 and the necessary and sufficient thickness. To do. When the adhesive force of the protective film layer 13 to the transfer substrate 11 is too great, the release layer 12 adheres the protective film layer 13 from the transfer substrate 11 to the recording medium 2 at the time of peeling after transfer to the recording medium 2. Can not be. If the adhesive force of the protective film layer 13 to the transfer substrate 11 is too small, burrs are generated at the end of the recording medium 2 after peeling from the transfer substrate 11. Adjustment of the adhesive force of the protective film layer 13 to the transfer substrate 11 may be performed by adjusting a mixing ratio of a resin suitable for peeling the protective film layer 13 and a resin for bonding the protective film layer 13. Is possible.

  Examples of the resin having appropriate adhesive strength suitable for the release layer 12 include polyvinyl alcohol resin, wax resin, vinyl acetate resin, polyvinyl butyral resin, vinyl acetate copolymer resin, acrylic resin, silicone resin, polyester resin, and each of these resins. Or the like. Alternatively, a transfer substrate 11 (support) with a release layer may be used.

  Next, a process for forming an image on the recording medium 2 and bonding the medium protection ribbon 1 to the recording medium 2 will be described with reference to FIG. FIG. 3 is a diagram for explaining an operation of forming an image on a recording medium and an operation of adhering a medium protection ribbon to the recording medium by the recording medium manufacturing apparatus according to the present embodiment.

  First, in the present embodiment, the recording medium manufacturing apparatus 3 takes in the recording medium 2 on which the third image G3 is formed on the image receiving layer 22 with ultraviolet curable ink by the base material supply apparatus 31, as shown in FIG. , Supplied to the transport unit 27.

  Next, the recording medium manufacturing apparatus 3 conveys the recording medium 2 to the image forming unit 32 including a recording member 33 such as a thermal head and an ink member 34 such as an ink ribbon, and receives an image receiving layer of the recording medium 2. A first image G1 by a sublimation thermal transfer system and a second image G2 by a thermal melting thermal transfer system are formed on 22.

  Subsequently, the recording medium manufacturing apparatus 3 adheres the recording medium 2 on which the first image G1 and the second image G2 are formed on the image receiving layer 22 by the lifter 35 to the protective layer including the medium protective ribbon 38 and the heating roller 37. To the unit 36. Thereafter, in the protective film layer bonding portion 36, the protective film layer 13 and the ultraviolet cut film layer 14 are thermally transferred (adhered) via the adhesive layer 15 onto the image receiving layer 22 of the recording medium 2. The recording medium 2 obtained in this way is discharged from the recording medium manufacturing apparatus 3.

Next, examples will be described in detail.
<Formation of release layer>
A release layer resin solution having the following composition is applied to one side of a 25 μm thick polyester film (an example of the transfer substrate 11) by a wire barcode method so as to have a thickness of 1 μm, and then dried to release layer 12. Formed.

<Release layer resin solution composition>
Pure water: 77 parts by weight Product No. NL-05 (Nippon Synthetic Chemical): 9 parts by weight Product No. MD1200 (Toyobo): 4 parts by weight

<Formation of protective film layer>
A protective film layer resin solution having the following composition was applied onto the release layer 12 by a wire barcode method so as to have a thickness of 10 μm, and dried to form a protective film layer 13. Thereafter, UV irradiation with a peak illuminance of 45 (mW / cm ² ) and an integrated light quantity of 321 (mJ / cm ² ) was performed from above the protective film layer 13 using a UV irradiator, and the protective film layer 13 was UV cured.

<Protective layer resin composition>
Methyl ethyl ketone ... 67 parts by weight Product type name: BR-87 (Mitsubishi Rayon) ... 11.5 parts by weight Product type name: BL-S (Sekisui Chemical) ... 1 part by weight Product type name: R-712 (Nippon Kayaku) ... 16 parts by weight Product type name: DPHA (Nippon Kayaku) ... 3 parts by weight Product type name: Irgacure 127 (BASF) ... 1 part by weight

<Formation of UV-cut film layer>
On the protective film layer 13, an ultraviolet cut film layer resin solution having the following composition was applied by a wire bar coating method so as to have a thickness of 2.4 μm, and then dried to form an ultraviolet cut film layer 14.

<Ultraviolet cut membrane layer resin solution composition>
Methyl ethyl ketone ... 38.5 parts by weight Toluene ... 38.5 parts by weight Product name: BR87 (Mitsubishi Rayon) ... 8.76 parts by weight Product name: 20% PVPA solution (Nippon Synthetic Chemical) ... 10 .95 parts by weight Product name: TINUBIN 234 (Ciba Specialty Chemicals) ... 3.28 parts by weight

<Formation of adhesive layer>
An adhesive layer resin solution having the following composition was applied on the ultraviolet cut film layer 14 by a wire bar coating method so as to have a thickness of 3 μm, and then dried to form an adhesive layer 15.

<Adhesive layer resin solution composition>
Pure water: 85 parts by weight Product name: AT-510 (Nippon Toagosei Co., Ltd.): 15 parts by weight Product name: KMP-701 (Shin-Etsu Chemical): 0.05 part by weight

<Formation of image receiving layer>
An image-receiving layer resin solution having the following composition is applied to one side of a 50 μm-thick white polyester film (manufactured by Toray KK, product model number: E20), and heated and dried at 120 ° C. for 30 minutes. An image receiving layer 22 was formed.

<Image-receiving layer resin solution composition>
Methyl ethyl ketone 30 parts by weight Toluene 30 parts by weight Product model: UR-1400 (Toyobo) 30 parts by weight Product model: TSF4700 (Toshiba Silicone) 0.2 parts by weight Product model: Coronate 2513 (Nippon Polyurethane) ... 1 part by weight

<Formation of UV curable ink part (third image G3)>
A logo mark / frame line (an example of the third image G3) of UV curable ink (ultraviolet curable ink) was printed (formed) on the image receiving layer 22 by offset printing.

<Process in recording medium manufacturing apparatus>
Using the recording medium manufacturing apparatus 3 shown in FIG. 3, an image was formed on the recording medium 2 described above, and a process of adhering (transferring) the ultraviolet cut film layer 14 and the protective film layer 13 was performed.

  (A) The recording medium 2 on which the printing of the third image G3 with UV curable ink is completed is taken into the recording medium manufacturing apparatus 3.

  (B) The first image G1 is printed (formed) on the image receiving layer 22 of the recording medium 2 by a sublimation type thermal transfer method, and the second image G2 is printed (formed) by a heat melting type thermal transfer method.

  (C) The protective film layer 13 and the ultraviolet cut film layer 14 are thermally transferred (adhered) to the image receiving layer 22 on which the printing of the first image G1 and the second image G2 has been completed via the adhesive layer 15.

  (D) The completed recording medium 2 is discharged out of the recording medium manufacturing apparatus 3.

In the step (C), the medium protective ribbon 1 is overlaid on the recording medium 2 so that the adhesive layer 15 side of the medium protective ribbon 1 is in contact with the image receiving layer 22 of the recording medium 2. Then, while feeding the medium protection ribbon 1 and the recording medium 2 by a heat roller, a platen roller, and a shaft, the medium protection ribbon 1 is heated from the transfer substrate 11 side by a heat roller at a pressure of 9 kgf / m ² and a transfer speed of 28 mm / s. By applying pressure, the ultraviolet cut film layer 14 and the protective film layer 13 are transferred to the surface of the recording medium 2 located on the platen roller.

Comparative example

  Next, a comparative example will be described. A recording medium was prepared in the same manner as in Example except that the adhesive layer of Comparative Example 1-6 shown below was used.

(Comparative Example 1)
<Formation of adhesive layer>
An adhesive layer having the following composition was applied on the ultraviolet cut film layer 14 by a wire bar coating method so as to have a thickness of 2 μm, and then dried to form an adhesive layer.

<Adhesive layer resin solution composition>
Pure water: 80 parts by weight Product name: SP-3055 (Konishi Bond): 20 parts by weight

(Comparative Example 2)
<Formation of adhesive layer>
An adhesive layer having the following composition was applied on the ultraviolet cut film layer 14 by a wire bar coating method so as to have a thickness of 5 μm, and then dried to form an adhesive layer.

<Adhesive layer resin solution composition>
Product name: Mobile 081F (Nippon Synthetic Chemical)

(Comparative Example 3)
<Formation of adhesive layer>
An adhesive layer having the following composition was applied on the ultraviolet cut film layer 14 by a wire bar coating method so as to have a thickness of 5 μm, and then dried to form an adhesive layer.

<Adhesive layer resin solution composition>
Product name: FW-408 (Nippon Chemical Paint)

(Comparative Example 4)
<Formation of adhesive layer>
An adhesive layer having the following composition was applied on the ultraviolet cut film layer 14 by a wire bar coating method so as to have a thickness of 2 μm, and then dried to form an adhesive layer.

<Adhesive layer resin solution composition>
Methyl ethyl ketone: 80 parts by weight Product name: Solvain A (Nisshin Chemical Industry)

(Comparative Example 5)
<Formation of adhesive layer>
An adhesive layer having the following composition of an emulsion not containing a plasticizer was applied onto the UV-cut film layer 14 by a wire barcode method so as to have a thickness of 3 μm, and then dried to form an adhesive layer.

<Adhesive layer resin solution composition>
Product name: Vinyl acetate resin emulsion adhesive CN230 (Konishi Bond)

(Comparative Example 6)
<Formation of adhesive layer>
An adhesive layer having the following composition as an acrylic adhesive was applied to the ultraviolet cut film layer 14 by a wire barcode method so as to have a thickness of 3 μm, and then dried to form an adhesive layer.

<Adhesive layer resin solution composition>
Product Name: AST 5221 (Nippon Catalyst)

  Next, when the polyacrylic acid ester copolymer shown in the examples is used for the adhesive layer 15 and when ethylene vinyl acetate shown in the comparative example is used for the adhesive layer, the ultraviolet cut film layer 14 for the recording medium 2 is used. The adhesion of the protective film layer 13 and the fading resistance of the sublimation printing portion will be described. FIG. 4 is a diagram showing the adhesion of the ultraviolet cut film layer and the protective film layer to the recording medium and the fading resistance of the sublimation printing portion when the adhesive layers shown in the examples and comparative examples are used.

  As a method for evaluating the adhesion of the ultraviolet cut film layer 14 and the protective film layer 13 to the recording medium 2, the surface of the recording medium 2 after the ultraviolet cut film layer 14 and the protective film layer 13 were bonded was peeled off with a tape or the like. In this case, peeling occurs at each part (the image receiving layer 22, the sublimation printing part that is the first image G1, the ultraviolet curable ink part that is the third image G3, and the melt printing part that is the second image G2) formed on the recording medium 1. A method of evaluating whether or not it occurs is used. And among each part of the recording medium 1 of each of Examples and Comparative Examples 1 to 6, in FIG. 4, the part marked with “x” represents that peeling occurred, and the part marked with “◯” This means that no peeling occurred.

  Further, in the evaluation method for fading resistance in the sublimation printing portion, the recording medium 2 is stored for 200 hours in an environment of 45 ° C. and 90% RH, and the sublimation printing portion changes its color such as fading or bleeding. The method of evaluating whether or not is used. And among the sublimation printing parts of the recording media 1 of each of Examples and Comparative Examples 1 to 6, in FIG. This indicates that no fading was observed in the sublimation printing section.

  As shown in FIG. 4, from the evaluation results of the adhesion and fading resistance of each of the above Examples and Comparative Examples 1 to 6, when a polyacrylate copolymer was used as the adhesive layer 15, the sublimation printing portion It was found that the ultraviolet cut film layer 14 and the protective film layer 13 could be transferred to the recording medium 1 without any fading such as thinning or bleeding.

  Thus, according to the medium protection ribbon 1 of the present embodiment, the plasticizer contained in the adhesive layer 15 can prevent the first image G1 formed on the image receiving layer 22 from being sublimated by the sublimation thermal transfer method. . Further, the acrylic ester copolymer constituting the adhesive layer 15 has a glass transition point Tg equal to or lower than the thermal transfer temperature when the medium protective ribbon 1 is heated and thermally transferred to the recording medium 2. Since it becomes easy to maintain flexibility, it is possible to prevent insufficient adhesive strength with respect to an image formed on the image receiving layer 22.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment is included in the scope and gist of the invention, and is also included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1 Medium protection ribbon 11 Transfer base material 12 Peeling layer 13 Protection film layer 14 Ultraviolet cut film layer 15 Adhesive layer 2 Recording medium 21 Card base material 22 Image receiving layer G1 1st image G2 2nd image G3 3rd image

Claims (6)

A medium protective ribbon that is thermally transferred to a recording medium on which an image is formed by a thermal melting type thermal transfer method and a sublimation type thermal transfer method,
An adhesive layer that is provided on the image and does not contain a plasticizer and includes an acrylate ester copolymer having a glass transition point equal to or lower than a thermal transfer temperature when the medium protective ribbon is heated and thermally transferred to the recording medium;
A protective layer that protects the UV-cut layer and the recording medium, laminated on the adhesive layer;
Medium protection ribbon with.   The medium protective ribbon according to claim 1, wherein the acrylic ester copolymer is an emulsion.   The medium protection ribbon according to claim 1, wherein the ultraviolet cut layer is provided between the protective layer and the adhesive layer. A support;
A release layer laminated on the support,
The medium protective ribbon according to any one of claims 1 to 3, wherein the adhesive layer, the ultraviolet cut layer, and the protective layer are provided on the support through the release layer. A method for producing a medium protection ribbon that is thermally transferred to a recording medium on which an image is formed by a thermal melting type thermal transfer method and a sublimation type thermal transfer method,
Providing a release layer on the support;
Laminating a UV protection layer and a protective layer for protecting the recording medium on the release layer;
Adhesion containing an acrylic ester copolymer not containing a plasticizer and having a glass transition point equal to or lower than the thermal transfer temperature when the medium protective ribbon is heated and thermally transferred to the recording medium on the ultraviolet cut layer and the protective layer Providing a layer;
A method for producing a medium protection ribbon comprising: A recording medium on which an image is formed by a thermal melting type thermal transfer method and a sublimation type thermal transfer method, and a medium protection ribbon is thermally transferred,
The media protection ribbon is
An adhesive layer that is provided on the image and does not contain a plasticizer and includes an acrylate ester copolymer having a glass transition point equal to or lower than a thermal transfer temperature when the medium protective ribbon is heated and thermally transferred to the recording medium;
A protective layer that protects the UV-cut layer and the recording medium, laminated on the adhesive layer;
A recording medium comprising:

Images