JP5953708B2 - Magnetic card - Google Patents

Description

  The present invention relates to a magnetic card.

  In the past, laser marking was a method of burning a part of a medium with heat with a powerful laser, which was a problem in aesthetics. Laser recording materials that can be used for cards include those in which a metal alloy is deposited in a thin film and those in which a transition metal compound is applied. When a magnetic recording material and a conventional laser recording material are used in a card, a metal alloy or a transition metal has magnetism, so that a laser recording layer cannot be provided on the magnetic recording layer.

  This is because the magnetism of the laser recording material causes troubles in reading and writing data of the magnetic recording material provided below. Therefore, conventionally, the magnetic recording area and the laser recording area are provided separately from each other so that any laser recording material is used without affecting the magnetic recording layer.

  Recent credit cards and cash cards are limited in design when the magnetic stripe is visible on the surface, so a concealing layer is provided on the magnetic recording layer, and a magnetic recording layer with a free image printed thereon is concealed. There are many cards.

  On the other hand, when printing is performed on the concealing layer, the concealing layer does not completely absorb the ink, so that unevenness due to the printed pattern is formed. In this case, since the gap between the magnetic head and the magnetic recording layer changes depending on the position of the printed pattern, it affects the jitter and output of the magnetic signal at the time of reading and writing, which becomes a problem.

  There are materials that can be laser-recorded in other applications, but for example, laser-recordable materials used in write-once optical discs use changes in reflection intensity with respect to infrared rays and ultraviolet rays, so Even if written, it was difficult to distinguish with the naked eye and could not be used for card applications.

  For these reasons, a card in which a laser recording material is provided on a magnetic recording material has not been manufactured so far.

  Techniques for laser marking on a medium are described in Patent Document 1 and Patent Document 2. Patent Document 3 discloses that information is written on a card with a laser.

Japanese Patent Publication No. 4-44329 Japanese Patent Publication No. 4-27037 Japanese Patent Laid-Open No. 2001-175838

  An object of the present invention is to provide a card that does not hinder the writing and reading of magnetic signals even if a coloring material that can be recorded by light is provided on a concealing layer provided on a magnetic recording material.

According to a first aspect of the present invention, a magnetic recording layer is provided on a base material, a concealing layer is provided thereon, an optical recording color forming layer containing leuco crystal violet and a photoradical generator is provided thereon, and A magnetic- writable magnetic card provided with a protective layer, wherein the concealing layer, the optical recording color-developing layer, and the protective layer do not contain a magnetic compound.

According to a second aspect of the present invention , a magnetic recording layer is provided on a substrate, a concealing layer is provided thereon, and crystal violet lactone, a nonmagnetic developer and a nonmagnetic infrared absorber are contained thereon. In the magnetic card capable of laser writing, in which the optical recording color developing layer is provided and the protective layer is provided thereon, the concealing layer, the optical recording color developing layer, and the protective layer do not contain a magnetic compound. is there.

The third invention is an optical recording in which a magnetic recording layer is provided on a substrate, a concealing layer is provided thereon, and N-methylacridino-β-naphthospiropyran and a photocurable resin are contained thereon. A laser writable magnetic card provided with a coloring layer and a protective layer thereon, wherein the concealing layer, the optical recording coloring layer, and the protective layer do not contain a magnetic compound.

A fourth invention is the magnetic card according to the first invention, wherein the photoradical generator is methyl o-benzophenone benzoate .
A fifth invention is the magnetic card according to the second invention, wherein the infrared absorber is a diimonium compound.

  According to the present invention, it is possible to obtain a magnetic card that does not interfere with reading and writing of data held in a magnetic recording layer even if arbitrary information is recorded on a concealing layer provided on the magnetic recording layer. Can do.

Schematic sectional view of the magnetic card of the present invention Schematic sectional view of a conventional magnetic card

In the first aspect of the present invention, a magnetic recording layer is provided on a substrate, a concealing layer is provided thereon, and an optical recording color- developing layer containing leuco crystal violet and a photoradical generator is provided thereon. In the magnetic writable magnetic card provided with a protective layer thereon, the concealing layer, the optical recording coloring layer and the protective layer do not contain a magnetic compound.

According to a second aspect of the present invention , a magnetic recording layer is provided on a substrate, a concealing layer is provided thereon, crystal violet lactone, a nonmagnetic developer, and a nonmagnetic infrared absorber. In a laser writable magnetic card provided with an optical recording color-developing layer containing a protective layer thereon, the concealing layer, the optical recording color-developing layer, and the protective layer do not contain a magnetic compound. It is a magnetic card.

In the third aspect of the present invention , a magnetic recording layer is provided on a base material, a concealing layer is provided thereon, and N-methyl-acridino-β-naphthospiropyran and a photocurable resin are contained thereon. A magnetic card that is provided with an optical recording color-developing layer and on which a protective layer is provided, wherein the concealing layer, the optical recording color-developing layer, and the protective layer do not contain a magnetic compound. .

A fourth aspect of the present invention is the magnetic card according to the first aspect, wherein the photoradical generator is methyl o-benzophenone benzoate .
A fifth aspect of the present invention is the magnetic card according to the second aspect, characterized in that the infrared absorber is a diimonium compound.

Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a magnetic card on which information is recorded by optical recording. The optical recording coloring layer is flat in both the coloring portion and the non-coloring portion, and can read and write information satisfactorily without changing the gap between the magnetic recording layer and the magnetic head. On the other hand, in the conventional magnetic card, it is inevitable that the pattern of the printed part is uneven to some extent.

  The optical recording coloring material used in the optical recording coloring layer of the present invention does not contain a transition metal or a magnetic material of a metal or a metal compound, and there is no problem in reading and writing information on the magnetic recording layer. A concealing layer and a protective layer that do not contain a magnetic material are used.

  Specifically, the optical recording coloring material that can be used in the present invention depends on the type of light used for writing, but either a material that reacts depending on the wavelength of light or a material that develops color by the heat of light alone. Or it can utilize by the combination of a several material.

  Various compounds that cause a photochemical reaction from infrared light to visible light and ultraviolet light are known. However, the use of these compounds on the magnetic recording material layer as an optical recording material or a laser recording material has never been considered.

  One of the reasons is that conventional optical recording materials have troubles in writing and reading magnetic recording materials, and cards are carried around every day, and a colorful color is preferred. This is because only a cloudy color was obtained.

  In the present invention, by using a leuco dye and a non-magnetic material as a photochromic material, it becomes possible to record a bright color such as a pastel color on a concealing layer of a card having a magnetic recording layer, which is colorful. Patterns and characters can be recorded.

Hereinafter, materials and methods that can be used in the present invention will be described.
<Photochromic recording>
As a photochromic recording method, a leuco dye having a chromophore that develops color from colorless, a coloring means for coloring the leuco dye, and a coloring prevention means for preventing the remaining leuco dye from coloring are required. A dye that changes color by light, such as spiropyran, needs a means to prevent the structure from returning to its original state after color development.

(Leuco dye)
The reduced form of the leuco dye is a dye that is colorless or light-colored and the oxidized form is dark. Color can be developed by oxidizing the reduced dye by some means or causing a structural change.

  Classifying from the structure of the dye, diphenylmethane, triphenylmethane, phenothiazine, spiropyran, fluorane, phenoxazine, thiofluorane, xanthene, phthalide, chromenopyrazole, leucooramine, methine, Aleuco dyes such as azomethine series, rhodamine lactam series, quinazoline series, diazaxanthene series and fluorene series can be used.

<Oxidation means>
As the oxidizing means, a method using the photo-oxidation function of titanium oxide, a hydrogen abstraction reaction with a radical generator, or a method in which an oxidizing agent (developer) and a leuco dye are melted and contact oxidation is used.

(Photooxidant)
The transition metal titanium is paramagnetic, while pure titanium oxide is non-magnetic. It is known that rutile type titanium oxide absorbs part of ultraviolet rays and visible light and causes a strong oxidizing action. By combining this rutile type titanium oxide and leuco dye, writing with light becomes possible.

  The hydrogen abstraction type photo radical generator can extract hydrogen from a leuco dye to develop a color of the leuco dye. For example, benzophenone, benzyl, 2-chlorothioxanthone, 2-methylthioxanthone, methyl o-benzophenone benzoate and the like can be used.

  In heat-sensitive recording, color is developed by melting and contacting a color former and developer dispersed on a support. Further, a sensitizer having a low melting point is added to increase the sensitivity. Optical recording and coloring materials can be made by combining a leuco dye, an organic material that absorbs light and generates heat, and a developer.

(Developer)
Examples of the oxidizing agent (developer) that does not contain a magnetic compound include α, α, α'-tris (4-hydroxyphenyl) -1-ethyl-4-isopropylbenzene, α, α'-bis (4- Hydroxyphenyl) -1,4-diisopropylbenzene, benzyl 4-hydroxybenzoate, 4,4'-biphenol, 2,2'-biphenol, 2,2-bis (3-sec-butyl-4- Hydroxyphenyl) propane, 1,1-bis (3-cyclohexyl-4-hydroxyphenyl) cyclohexane, 2,2-bis (3-cyclohexyl-4-hydroxyphenyl) propane, 2,2-bis (2-hydroxy-5) -Biphenylyl) propane, 2,2-bis (4-hydroxy-3-isopropylphenyl) propane, 1,1-bis (4-hydroxy-3-methylphenol) L) cyclohexane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 1,3 -Bis [2- (4-hydroxyphenyl) -2-propyl] benzene, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, 4-tert-butylphenol, 4,4'-dihydroxy Diphenyl ether, 4,4'-dihydroxydiphenylmethane, 4,4 '-(1,3-dimethylbutylidene) diphenol, 4,4'-(2-ethylhexylidene) diphenol, 4, 4'-ethylidenebisphenol, 4,4 '-(2-hydroxybenzylidene) bis (2,3,6-trimethylphenol), 4,4' Methylene bis (2-methylphenol), 1,1'-methylenedi-2-naphthol, methyl 4-hydroxybenzoate, 1-naphthol, 2-naphthol, 4-phenylphenol, resorcino- , Tetrabromobisphenol A, 4- (1,1,3,3-tetramethylbutyl) phenol, 2,3,4-trihydroxydiphenylmethane, 1,1,1-tris (4-hydroxy Phenyl) ethane and the like.

(Sensitizer)
Examples of sensitizers that do not include magnetic compounds include behenic acid, 4-benzylbiphenyl, benzyl 2-naphthyl ether, 1,4-dibenzyloxybenzene, dibenzyl sulfoxide, 2,6-diisopropylnaphthalene, terephthalic acid. Dimethyl, 1,4-diphenoxybenzene, diphenyl carbonate, dibenzoylmethane, diphenylsulfone, ethylene glycol diphenyl ether, fluoranthene, fluorene, hexadecanamide, hexaneamide, lauric acid, methyl 3-hydroxy-2-naphthoate, Examples include myristic acid, n-octaneamide, oleic acid amide, palmitic acid, phenyl 1-hydroxy-2-naphthoate, stearic acid amide, stearanilide, 1,3-diphenylbenzene, and the like.

(Infrared absorber)
Infrared absorbers include, for example, cyanine compounds, cyanine methine compounds, polymethine compounds, azo compounds, naphthoquinone compounds, anthraquinone compounds, squarylium compounds, pyrylium compounds, cerium compounds, diimonium compounds, imonium compounds. In addition, diphenylmethane compounds, triphenylmethane compounds, triallylmethane compounds, oxol compounds, and the like are known. Some require a counter ion or complex compound in addition to the compound alone, and it is necessary to select a counter ion or complex compound that does not contain a magnetic compound.

<Coloring prevention means>
The means for preventing color development differs depending on the coloring material and the coloring means. For example, in a method in which a leuco dye and a developer are physically separated and heated and melted with a laser beam or the like to develop a color, no subsequent coloring prevention means is required.

  As a method of oxidizing an leuco dye by generating an oxidizing agent by light stimulation, a method of preventing oxidation of the leuco dye by forming a reducing agent with light of different wavelengths can be considered. For example, the leuco dye can be colored with a visible laser and the entire surface is exposed to ultraviolet light to generate a reducing agent, and the oxidizing agent can be reduced prior to the dye to prevent color development.

  At this time, it is possible to form a reverse image by writing with an ultraviolet laser and then exposing the entire surface with visible light.

(Formation of reducing agent)
The quinone compound becomes a hydroquinone compound by light, and the hydroquinone compound acts as a reducing agent.

<Preventing coloring of spiropyran dyes>
Spiropyran-based dyes change color by absorbing exposure energy and develop color. After that, even if energy is released thermally, it returns to its original structure and disappears. If the binder is cross-linked after coloring, and the dye is fixed in the binder, the colored dye cannot return to its original structure and the image will not disappear, while the uncolored leuco dye cannot change its structure. , Can prevent excessive color development.

(Hikari Bridge Polymer)
Polyvinyl cinnamate obtained by reacting chlorocinnamic acid with polyvinyl alcohol can be crosslinked by a photodimerization reaction to immobilize the spiropyran dye.
In addition to cinnamic acid, compounds that undergo photodimerization are known, such as benzalacetophenone, benzylideneacetophenone, coumarin, styrylpyridine, iminostilbene, and phenylmaleimide, and can be used for photocrosslinking polymers. .

  As the base material of the card, a commonly used white PVC sheet or transparent PVC sheet can be used. The ink of the hiding layer can also be used by dispersing a non-magnetic white pigment in a commercially available medium. Since the protective layer cannot use photocurable ink, thermosetting ink or coating / drying ink is used.

(Creation of base material)
In the large format process (30-sided), two white hard vinyl chloride sheets with a thickness of 280 μm were used as the core sheet of the card substrate, and register marks for alignment were printed on the respective surfaces with an offset.
Overlay (100 μm thick transparent vinyl chloride sheet) on which magnetic tapes with a width of 7.3 mm have been laid on the surface side of the two core sheets so that the register marks are printed on the outside. Overlap (overlay) (transparent vinyl chloride sheet with a thickness of 100 μm) on which the magnetic tape has not been transferred on the back side and temporarily attached to the back side, and then introduced into a press machine and heat-pressure fusion (150 ° C., 20 kgf / cm ² , 30 minutes).

  It is an ink obtained by adding 10% by weight of titanium oxide to a vinyl chloride-based medium (VAHS medium, manufactured by Showa Ink Co., Ltd.), and is screen-printed on the surface of the sheet on which the magnetic tape is transferred. A shielding layer was formed by printing on the front surface to a thickness of 6 μm.

  The large size was cut into individual cards, and a base material 1 with a magnetic layer and a concealing layer having a four-layer structure having a thickness of 760 μm was obtained.

Example 1
Photochromic ink A was obtained from the following composition, applied to the concealing layer surface of the substrate with a wire bar, and dried. Dry film thickness of 1.5 μm.
Photochromic ink A:
Triphenylmethane dye (leuco crystal violet): 1 part by weight Photoradical generator [methyl o-benzophenone benzoate]: 1 part by weight Quinone: 1 part by weight Vinyl acetate resin: 10 parts by weight Toluene, methyl ethyl ketone 1: 1 mixture Solvent: 100 parts by weight

The protective layer ink B was coated with a wire bar on the photochromic ink A layer using the following emulsion and dried to obtain a magnetic card. Dry film thickness of protective layer ink B 1.0 μm
Protective layer ink B:
Acrylic emulsion “Viniplan (registered trademark) 2585”
(Manufactured by Nissin Chemical Industry Co., Ltd.)

  After writing the pattern with the green laser on the optical recording card of Example 1, the entire surface was irradiated with ultraviolet light, hydroquinone was produced in the pattern written with the green laser, and the radical generated by the ultraviolet light was inactive with hydroquinone. The remaining leuco dye develops color, but a negative image is formed.

(Example 2)
Photochromic ink C was obtained from the following composition, applied to the surface of the concealing layer of the substrate with a wire bar, and dried. Dry film thickness of 1.5 μm.
Photochromic ink C:
Leuco dye (crystal violet lactone): 1 part by weight Developer (benzyl 4-hydroxybenzoate): 1 part by weight Sensitizer (ethylene glycol diphenyl ether): 0.5 part by weight Vinyl chloride emulsion (solid content 20%) : 50 parts by weight Water: 100 parts by weight Infrared absorbent (diimonium compound) represented by the following chemical formula: 0.2 parts by weight

  The protective layer ink B was applied onto the photochromic ink C layer with a wire bar and dried to obtain a magnetic card. The dry film thickness of the protective layer ink B is 1.0 μm.

  A pattern was drawn on the magnetic card of Example 2 with an infrared laser to obtain a purple image.

Example 3
Photochromic ink D was obtained from the following composition, applied to the concealing layer surface of the substrate with a wire bar, and dried. Dry film thickness of 1.5 μm.
Photochromic ink D:
Leuco dye (N-methylacridino-β-naphthospiropyran): 1 part by weight Photopolymer (polyvinylcinnamate): 10 parts by weight Toluene, methyl ethyl ketone 1: 1 mixed solvent: 100 parts by weight

  The protective layer ink B was applied onto the photochromic ink D layer with a wire bar and dried to obtain a magnetic card. The dry film thickness of the protective layer ink B is 1.0 μm.

  A pattern was written on the magnetic card of Example 3 using a blue laser to develop color. Thereafter, ultraviolet rays were irradiated on the entire surface to cure the photopolymer.

  The magnetic card of the present invention can provide a card on which a pattern can be drawn by optical recording regardless of the position of the magnetic recording layer, and a design can be freely designed.

1: base material 2: magnetic layer 3: concealing layer 4: optical recording color developing layer 5: protective layer 11: photo coloring unit 12: printed image

Claims (5)

A magnetic recording layer was provided on the substrate, a concealing layer was provided thereon, an optical recording color forming layer containing leuco crystal violet and a photo radical generator was provided thereon, and a protective layer was provided thereon. A magnetic card capable of laser writing, wherein the concealing layer, the optical recording color forming layer, and the protective layer do not contain a magnetic compound. An optical recording color layer comprising a magnetic recording layer on a substrate, a concealing layer provided thereon, and a crystal violet lactone, a non-magnetic color developer and a non-magnetic infrared absorber contained thereon A magnetic card capable of being written on a laser and having a protective layer thereon, wherein the concealing layer, the optical recording color-developing layer, and the protective layer do not contain a magnetic compound . A magnetic recording layer is provided on a substrate, a concealing layer is provided thereon, and an optical recording coloring layer containing N-methylacridino-β-naphthospiropyran and a photocurable resin is provided thereon, A magnetic card capable of being written on a laser having a protective layer thereon, wherein the concealing layer, the optical recording coloring layer, and the protective layer do not contain a magnetic compound . 2. The magnetic card according to claim 1, wherein the photoradical generator is methyl o-benzophenone benzoate. 3. The magnetic card according to claim 2, wherein the infrared absorber is a diimonium compound.

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