JPS621569A - Transfer sheet - Google Patents

Abstract

PURPOSE:To provide a transfer sheet for preparing cards effectively preventing forgery and easily discriminating authenticity and capable of excluding forged cards, by laminating a release layer, an infrared absorbing layer, an infrared reflective layer and an adhesive layer onto a base film in this order. CONSTITUTION:A release layer 2, an infrared absorbing layer 6, an infrared reflective layer 7, a magnetic recording layer 8 and an adhesive layer 9 are laminated onto a base film 1 in this order. Pref., two or more of a protective layer 3, a printing layer 4 and a concealing layer 5 are provided inside the infrared absorbing layer in this order so as to appear to the outside at the time of transfer. When infrared rays are allowed to irradiate a card having a magnetic recording medium prepared by using this transfer sheet, the part where the infrared absorbing layer 6 is present reflects almost no infrared rays while, because the infrared reflective layer 7 is provided to the part not having said layer 6, infrared rays are highly reflected. From this difference between reflectivities, a character or pattern is read to discriminate authenticity.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a transfer sheet used for manufacturing cards having a magnetic recording medium, which is difficult to forge and whose authenticity is easy to distinguish. [Background Art] In recent years, cards with magnetic recording media have become extremely popular and are used in a wide range of applications, including cash cards, bank passbooks, credit cards, train tickets, coupon tickets, and commuter passes. As magnetic cards become more widespread, there are people who misuse them by forging or copying them, and there is a need for technology to prevent this and to accurately determine the authenticity of cards.

Problems to be Solved by the Invention The purpose of the present invention is to meet the above requirements, effectively prevent counterfeiting, and easily distinguish between genuine and false products.
To provide a transfer sheet for manufacturing cards that can eliminate fake cards. Oimame's imperial feeling

[Means to solve the problem]

The transfer sheet of the present invention is characterized in that a release layer, an infrared absorbing layer, an infrared reflective layer, and an adhesive layer are laminated in this order on a base film, and magnetic recording is performed between any of the above layers. It may have layers. The transfer sheet of the present invention has various aspects, which will be explained below with reference to the drawings. In the embodiment shown in FIG. 1, a release layer 2, an infrared absorbing layer 6, an infrared reflecting layer 7, a magnetic recording layer 8, and an adhesive layer 9 are laminated in this order on a base film 1. In the embodiment shown in FIG.
are stacked in this order. In the embodiment shown in FIG. 3, a release layer 2, an infrared absorbing layer 6, a magnetic recording layer 8 made of a material with high infrared transmittance, an infrared reflecting layer 7, and an adhesive layer 9 are formed on a base film 1 in this order. It is laminated. In the embodiment shown in FIG. 4, a release layer 2, an infrared absorbing layer 6, a magnetic recording layer 8' made of a material with high infrared reflectance, and an adhesive layer 9 are laminated in this order on a base film 1. The magnetic recording layer 8' also serves as an infrared reflective layer. In the embodiment shown in FIG. 5, a release layer 2, an infrared absorbing layer 6, a magnetic recording layer 8 made of a material with high infrared transmittance, and an adhesive layer 9 made of a material with high infrared reflectance are provided on a base film 1. ' are laminated in this order, and the adhesive layer 9' also serves as an infrared reflective layer. In the embodiment shown in FIG. 6, a release layer 2, an infrared absorbing layer 6, and an adhesive layer 9' with high infrared reflectance are laminated in this order on a base film 1. Also serves as an infrared reflective layer. As shown in FIGS. 1 to 6, the transfer sheet of the present invention preferably has a protective layer 3, a printed layer 4, which is formed inside the infrared absorbing layer, that is, so that it can appear outside when transferred.
and one or more types of concealing layer 5, and in the case of two or more types, they are provided in this order. The base material is in the form of a sheet or a plate, and its material is T. Plastics such as aluminum, cellulose diacetate, cellulose triacetate, polystyrene, polyethylene, polypropylene, polyester, polyimide, polycarbonate, metals such as copper and aluminum, paper, impregnated paper, etc. can be used alone or as a composite. . A preferable material may be selected from the above-mentioned materials in consideration of the physical properties required of the base material, such as strength, rigidity, hiding power, and light opacity. The thickness of the base material is approximately 0.005 to 5 m. The release layer may be formed using a commonly used paint for release layers. The protective MM can be formed by laminating a synthetic resin film, extrusion coating, or applying a synthetic resin paint. The synthetic resin constituting the protective layer may be the same as the synthetic resin used to form the reflective layer, taking into consideration the intended use and adhesion with other layers. The use of a thermosetting synthetic resin is advantageous in terms of surface hardness and prevention of contamination, and it is particularly preferable to use a paint containing an ultraviolet curable synthetic resin because it can be cured instantly after application. The magnetic recording layer is γ-Fe2O3, CO coated-Fe203
, Fe3O4, CrO2, Fe, Fe-Cr, F
e-Co, Co-Cr, Co-Ni,
It can be formed on a substrate by dispersing known magnetic fine particles such as MnAl, Ba ferrite, and 3r ferrite in a suitable resin or ink vehicle, and by coating methods such as gravure method, roll method, and knife method.
The magnetic recording layer may also include Fe, Fe-Cr, Fe-
Metals or alloys such as Co5Co-Cr can also be formed as thin films on the substrate by vacuum evaporation, sputtering, plating, etc. When forming the magnetic recording layer by coating, the film thickness is 1
~100μ, preferably about 5~20μ. When the magnetic recording layer is formed by vacuum evaporation, sputtering, or plating, the film thickness is about 100 to 1 μm, preferably about 500 to 2000 μm. Examples of the resin or ink vehicle for dispersing magnetic fine particles such as 7" Fe2O3 include butyral resin, vinyl chloride-vinyl acetate copolymer resin, urethane resin, polyester resin, cellulose resin, acrylic resin, and styrene-maleic acid copolymer resin. If necessary, rubber-based resin such as nitrile rubber, urethane elastomer, etc. are added.The infrared reflective layer is made of paint or ink obtained by dispersing pigments with high infrared reflectance in a binder. The binder is a cellulose derivative such as ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, or cellulose acetate, a styrene resin such as polystyrene, poly-α-methylstyrene, polymethyl methacrylate, or polyethyl methacrylate. , acrylic or methacrylic resins such as polyethyl acrylate and butyl polyacrylate, rosin, rosin-modified maleic acid resin, rosin-modified phenolic resin, polymerized rosin and other gin ester resins, polyvinyl acetate resin,
Coumaron resin, vinyl toluene resin, vinyl chloride resin,
Choose from polyester resin, polyurethane resin, butyral resin, etc. A plasticizer and other various additives are used as necessary. The layer is formed using the normal gravure method,
Coating or printing methods such as a roll method, knife method, and offset method may be used. The magnetic recording layer is made of Fe, Fe-Cr, Fe-C01.
If a metal or alloy such as Go-Or is formed by vacuum evaporation, sputtering, plating, etc., a magnetic recording layer,
It is also possible to make it serve as an infrared reflective layer. Roughly, films of metals such as Te, 3nSIn, AI, 3i, Pb, Zn, their alloys, and compounds such as Te carbide,
The infrared reflective layer can also be formed by vacuum evaporation, sputtering, plating, or the like. The infrared absorbing layer is formed at a desired position by coating or printing a material in which quinocyanines, thiacyanins, and the like having high infrared absorbance are dispersed in a binder similar to that used for the infrared reflective layer. The hiding layer is formed by applying or printing the same binder as above and adding various pigments that transmit infrared rays but not visible light to form a paint or ink. The printing layer is provided by printing a desired pattern using a known ink and printing method. Like the hiding layer, it is preferable to use an ink that reflects or absorbs visible light and transmits infrared rays. The adhesive layer is necessary for binders such as vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, salt pyropropionic acid copolymer, rubber resin, cyanoacrylate resin, cellulose resin, ionomer, and polyolefin. It can be formed on a desired portion of a substrate by coating means such as gravure, roll, knife, etc. using a paint for an adhesive layer prepared by adding additives and kneading with a solvent or diluent. In particular, when providing an adhesive layer on the magnetic recording layer, in order to prevent the magnetic recording layer from re-dissolving, it is necessary to apply an emulsion of thermoplastic resin and dry it to form a heat-sealable adhesive layer. is preferred. [Function] When a card having a magnetic recording medium manufactured using the transfer sheet of the present invention is irradiated with infrared rays, the portion where the infrared absorbing layer 6 is present hardly reflects the infrared rays, while the portion where the infrared absorbing layer 6 is not present reflects the infrared rays. Since the infrared reflective layer 7 is provided, infrared rays are reflected at a high rate. Based on this difference in reflectance, characters and patterns can be read and authenticated. Since the difference in reflectance is large, misreading is virtually zero. In a preferred embodiment in which a concealing layer 5 that transmits infrared rays is provided on the infrared absorbing layer 6, the presence of the infrared absorbing layer 6 is not even detected, so that characters and patterns cannot be visually distinguished. If a printing layer 4 such as a ground pattern, a pattern, or letters is provided on top of that,
Enhance the effect even more.

Example 1 A release layer paint having the following formulation was prepared. (All "parts" are parts by weight.) Cellulose acetate resin (Dainippon Celluloid) 5 parts Methylolmelamine thermosetting resin (Nippon Carbide) 1 part Methyl ethyl ketone 50 parts Methyl alcohol 25 parts Toluene
This paint for a release layer was gravure coated on a base material of a polyester film having a thickness of 25μ to form a release layer having a thickness of 0.5μ. A protective layer paint having the following formulation was prepared. Polyvinyl butyral resin [Eslec BXJ (Tsukumizu Kagaku) 3 parts Moisture-curing urethane resin "Orestar M95-50AJ (Mitsui Toatsu) 3 parts methyl ethyl ketone 30 parts toluene
30 parts ethyl acetate
30 parts total 96 parts This paint for a protective layer was gravure coated on the release layer to form a protective layer with a thickness of 0.5 μm. A printing layer paint having the following formulation was prepared. Partially saponified chloride vinyl acetate copolymer resin "Vinylite VAGHj (UCC)" 20 parts Pigment 10 parts Isocyanate hardener "Takenate D11ONJ (Narita Pharmaceutical Industries) 3 parts Methyl ethyl ketone 30 parts Toluene
30 copies total 93 copies Gravure printing was carried out on the protective layer using this printing layer paint,
A printed layer with a thickness of 1 μm was formed. A coating for a concealing layer was prepared with the following formulation. Partially saponified vinyl chloride vinyl acetate copolymer resin “Vinyrite VAGHJ 20 parts Pigment 10 parts Isocyanate hardener [Takenate D11ON4 3 parts Methyl ethyl ketone 30 parts Toluene
30 parts, 93 parts in total This coating material for the hiding layer was gravure coated on the printing layer to form a hiding layer having a thickness of 1 μm. A paint for an infrared absorbing layer having the following formulation was prepared. Partially carbonated raw salt vinyl vinyl acetate copolymer resin “Vinyrite VAGHJ 20 parts Pigment rIR750J (Nippon Choyaku) 10 parts Isocyanate hardener [Takenate D11ONJ 3 parts Methyl ethyl ketone 30 parts Toluene
30 parts total 93 parts This infrared absorbing layer coating material was coated onto the printing layer in a barcode pattern by gravure printing to form an infrared absorbing layer with a thickness of 2 μm. A paint for an infrared absorbing layer having the following formulation was prepared. Partially carbonated raw salt vinyl vinyl acetate copolymer resin “Vinylite VAGHJ” 20 parts White pigment 10 parts Isocyanate hardener “Takenate D11ONJ 3 parts Methyl ethyl ketone 30 parts Toluene
30 parts total 93 parts This paint for an infrared reflective layer was gravure coated on the infrared absorbing layer to form an infrared reflective layer with a thickness of 2 μm. A magnetic paint having the following composition was prepared. 7 Fe2O3r7 MRDJ (Titan Industries) 75 parts Partially saponified chloride vinyl acetate copolymer resin "Vinyrite VAGHJ" 10 parts Polyurethane elastomer resin "Sunbren 1B114BJ
(Sanyo Chemical Industries) 25 parts linear saturated polyester resin "Vylon RV53SSJ (Toyobo> 10 parts isopropyl alcohol 50 parts methyl ethyl ketone 50 parts toluene
50 parts Isocyanate sand curing agent AT Mytic NY-220AJ (Mitsubishi Kasei)
- A total of 273 parts of this magnetic paint was once gravure coated on the infrared reflective layer to form a magnetic recording layer with a thickness of 10 μm. A paint for the adhesive layer was prepared with the following formulation. Vinyl chloride vinyl acetate copolymer resin [Denkarac 721J (
Electrochemistry) 10 parts acrylic resin
20 parts toluene
80 parts ethyl acetate
- A total of 190 copies of this paint for adhesive layer was gravure coated on the magnetic recording layer to form an adhesive layer with a thickness of 10 μm. The transfer sheet formed in the above order had the form shown in FIG. 1, and was transferred to a card base material to produce a card having a magnetic recording medium. This card had good performance in both writing and reading information, and it was easy and accurate to determine authenticity using infrared rays. Next, a transfer sheet of the form v shown in FIG. 2 was obtained in the same manner as above except that the magnetic recording layer was not provided. This was transferred to the other side of a card base having a magnetic recording medium on one side to form a card. This card had similar performance. [Example 2] A peeling layer, a protective layer, a printing layer, a hiding layer, an infrared absorbing layer, a magnetic recording layer, an infrared reflecting layer were coated on a polyester film base material with a thickness of 25 μm using the same paint as in Example 1. The layer and adhesive layer were formed in this order. The obtained transfer sheet has the form shown in Fig. 3, and cards with magnetic recording media manufactured using this sheet can also be used.
It had the same performance as the product of Example 1. [Example 3] A release layer, a protective layer, a printing layer, a hiding layer, and an infrared absorbing layer were formed in this order on a polyester film base material with a thickness of 25 μm using the same paint as in Example 1, Qo-Ni was deposited thereon to a thickness of 500 nm by vacuum evaporation to form a magnetic recording layer which also served as an infrared reflective layer, and an adhesive layer was further formed thereon. The transfer sheet formed in the above order had the form shown in Figure 4, and cards with magnetic recording media manufactured using this sheet also had the same performance as the product of Example 1. .

Example 4 An adhesive paint having the following formulation was prepared. Vinyl chloride vinyl acetate copolymer resin “Denkarac 721J”
10 parts acrylic resin
20 parts toluene
80 parts ethyl acetate
80 parts pigment rTi02J
10 parts total 200 parts A release layer, a protective layer, and a printing layer were coated on a polyester film base material with a thickness of 25 μm using the same paint as in Example 1, except that the above adhesive paint was used. , a hiding layer, an infrared absorbing layer, a magnetic recording layer, and an adhesive layer that also served as an infrared reflective layer were formed in this order. The resulting transfer sheet had the form shown in FIG. 5, and cards with magnetic recording media manufactured using this sheet also had the same performance as the product of Example 1. Next, a transfer sheet of the embodiment shown in FIG. 6 was obtained in the same manner as above except that the magnetic recording layer was not provided. This was used to produce a card having a magnetic recording layer on one side of the substrate, which showed the same performance as the product of Example 1. [54] The transfer sheet of the present invention has a magnetic recording medium manufactured using the transfer sheet, and even though the presence of the magnetic recording layer is relatively easily known and the cards possessed by the magnetic recording medium may be copied, Since the presence of the infrared reflective layer and absorbing layer is not easily detected, there is little risk of counterfeiting. Therefore, even if there is a counterfeit product in which only the magnetic recording layer is copied, the product cannot be affected by infrared rays, so it can be immediately recognized as a counterfeit product and can be eliminated. A conventional device can be used to write information to the magnetic recording layer, and a means for determining the difference in infrared reflectance for reading only needs to be added. In a preferred embodiment in which a hiding layer, a printed layer, and a protective layer are provided, the hiding layer makes it difficult to detect that the infrared absorbing layer is provided, and the printed layer further enhances the effect. In addition,
The protective layer protects entries such as commuter passes or credit cards from abrasion and provides durability for items that need to be carried and presented over long periods of time.

[Brief explanation of drawings]

FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6 are all schematic cross-sectional views showing various aspects of the structure of the transfer sheet of the present invention. 1... Base film 2... Peeling layer 3... Protective layer 4... Printing layer 5... Hiding layer 6... Infrared absorbing layer 7... Infrared reflecting layer 8... Magnetism Recording layer 8'... Magnetic recording layer 9 that also serves as an infrared reflective layer... Adhesive layer 9'... Adhesive layer that also serves as an infrared reflective layer Patent applicant
Dai Nippon Printing Co., Ltd. Agent Patent Attorney Souo Suga Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 rllJ

Claims (9)

[Claims] (1) A release layer, an infrared absorption layer, an infrared reflection layer, and an adhesive layer are laminated in this order on a base film, and a magnetic recording layer is provided between any of the above layers. There is a transfer sheet. (2) A transfer sheet according to claim 1, comprising a base film, and a peelable infrared absorbing layer, an infrared reflecting layer, a magnetic recording layer, and an adhesive layer laminated in this order. (3) A transfer sheet according to claim 1, comprising a release layer, an infrared absorbing layer, an infrared reflecting layer, and an adhesive layer laminated in this order on a base film. (4) A peelable infrared absorbing layer, a magnetic recording layer made of a material with high infrared transmittance, an infrared reflective layer, and an adhesive layer are laminated in this order on a base film.
Section transfer sheet. (5) A patent claim in which a release layer, an infrared absorbing layer, a magnetic recording layer made of a material with high infrared reflectance, and an adhesive layer are laminated in this order on a base film, and the magnetic recording layer also serves as an infrared reflective layer. Transfer sheet of range 1. (6) Laminating a release layer, an infrared absorbing layer, a magnetic recording layer made of a material with high infrared transmittance, and an adhesive layer made of a material with high infrared reflectance on the base film in this order,
The transfer sheet according to claim 1, wherein the adhesive layer also serves as an infrared reflective layer. (7) Claim 1, in which a release layer, an infrared absorbing layer, and an adhesive layer made of a material with high infrared reflectance are laminated in this order on a base film, and the adhesive layer also serves as an infrared reflective layer. transfer sheet. (8) Claims 1 to 7, wherein one or more of a protective layer, a printed layer, and a concealing layer are provided inside the infrared absorbing layer, and in the case of two or more, in this order. Any transfer sheet. (9) A transfer sheet according to any one of claims 1 to 8 used for manufacturing commuter passes or credit cards.