JPH1092021A - Optical card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical card having satisfactory adhesive strength between a transparent substrate and a back substrate by setting the breaking elongation of a core material layer to a value not larger than a specific value in an optical card having an adhesive layer consisting of a first adhesive layer, the core material layer and a second adhesive layer. SOLUTION: In an optical card 1, a rear substrate 7 is adhered on an optical recording layer 5 via a multilayer adhesive layer 6a consisting of a first adhesive layer 8, a core material layer 9 and a second adhesive layer 10, and a printing layer 11 for forming visible information is provided outside the rear substrate 7. In this case, for the first and the second adhesive layer, the same adhesive such as adhesion or hot melt type adhesive is used, and vinyle chloride is used for the core material layer 9. Here, the core material layer 9 is of a plate shape and is made of a material having flexibility and hardly causing embosment distortion, that is, a material having a characteristic that the breaking elongation is 200% or less, preferably 100% or less. When the breaking elongation of the core material layer 9 exceeds 200%, distortion on the surrounding of embosment information part of the card subjected to embosment working may become layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical card which can be embossed.

[0002]

2. Description of the Related Art Conventionally, a plastic card such as a credit card or a cash card is a card in which a magnetic stripe, an embossed character, visible information by printing, a hologram, etc. are formed on a vinyl chloride resin base (hereinafter, a magnetic card). ). Recently, an optical card having advantages such as a larger recording capacity, superior durability, and incapability of falsification as compared with a magnetic card has been developed. For example, an optical card described in JP-A-1-251442 has been developed. It has been known.

[0003] By the way, a magnetic card includes, for example, a distributor name of a medium, a system name, visible information such as character information or image information of a medium owner, and a card-specific information such as a personal name or a registration number. Is formed by embossing which is an embossed character.

In embossing, a convex character is provided on a card by pressure, and the convex character is colored so that it can be easily confirmed visually. This embossed character is based on ISO 7810 and JIS X6
It is formed in the shape defined by 301. It is desired that an optical card can be embossed in order to maintain compatibility with a magnetic card and use the same.

The conventional magnetic card has a structure in which a transparent vinyl chloride film or a polyethylene terephthalate film is laminated on the front and back of a white vinyl chloride resin core material. When the magnetic card is embossed, the distortion due to the processing around the embossed character can be suppressed to a small value, so that the embossed character can be formed well.

On the other hand, in the case of an optical card, FIG. 3 (a) shows a plan view of a conventional optical card and FIG. 3 (b) shows a cross-sectional view taken along the line CC '. A transparent substrate 4 having a preformat pattern 3 consisting of: an optical recording layer 5 formed on the preformat pattern 3 of the transparent substrate 4; an adhesive layer 6 on the optical recording layer 5; printing including visible information Back substrate 7 provided with layer 11
Are sequentially laminated.

Conventionally, the adhesive layer 6 has a thickness of 30 to 100.
Instant adhesives, UV-curable adhesives, two-component adhesives, thermosetting adhesives, tacky adhesives, and hot-melt adhesives are known as adhesives. When a reactive adhesive is used for the adhesive layer 6 for bonding the transparent substrate 4 and the back substrate 7, the optical recording layer of the optical card is often damaged, and the recording sensitivity is poor due to high hardness after curing. Not used because of the disadvantage of becoming
As an adhesive for an optical card, a tacky adhesive or a hot-melt adhesive which is a non-reactive adhesive is used.

However, if an optical card using the above-mentioned adhesive is embossed, the mechanical strength of the adhesive layer is small and the elongation is large. There is a problem that distortion occurs in the surroundings (hereinafter, referred to as emboss distortion). As a solution to this, JP-A-7-257079 discloses that the breaking strength is 50 kg / cm ² or more and the breaking elongation is 600%.
An optical card using an adhesive film having the following mechanical properties and excellent in emboss processing is disclosed.

[0009]

However, among adhesives or hot-melt adhesives which are non-reactive adhesives, various adhesives having mechanical properties with high breaking strength and low breaking elongation have been searched. However, since the above-mentioned mechanical properties of the white vinyl chloride resin material used for the conventional embossed magnetic card are completely inferior, when an optical card using the above-mentioned adhesive is embossed, the emboss distortion becomes embossed. There is a problem that the size of the card becomes larger than that of the attached magnetic card.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and does not damage the optical recording layer, has good recording sensitivity, and has a good adhesion to the transparent substrate and the back substrate. It is an object of the present invention to provide an optical card having a large emboss distortion as small as a magnetic card.

[0011]

As a result of intensive studies to achieve the above object, it has been found that emboss distortion can be reduced by forming a material having a small breaking elongation in the adhesive layer as a core material. That is, the present invention provides an optical card in which an emboss information area is provided in a portion other than the optical recording area, and a transparent substrate, an optical recording layer, an adhesive layer, and a back substrate are laminated in this order, wherein the adhesive layer is at least A multilayer adhesive layer comprising a first adhesive layer, a core material layer, and a second adhesive layer from the transparent substrate side, and the breaking elongation of the core material layer is 200
% Or less.

By using the multilayer adhesive layer having the above structure, an optical card having good adhesion between the transparent substrate and the back substrate and having small distortion of the optical card due to embossing can be obtained. Further, the present invention is preferably an optical card in which the first and second adhesive layers are formed of the same adhesive. The first
Since the second adhesive and the second adhesive are the same, a multilayer adhesive can be manufactured at low cost.

Further, in the present invention, an optical card in which the first and second adhesive layers are made of a tacky adhesive or a hot-melt adhesive is preferable. Since the adhesive has little adverse effect on the optical recording layer, an optical card having good durability can be obtained. Further, in the present invention, an optical card in which the core material layer is made of a resin material is preferable. By using a core material layer of a resin material, a flexible and inexpensive multilayer adhesive layer can be obtained.

In the present invention, an optical card in which the core material layer is formed of a vinyl chloride resin is preferred. By using the above material, the emboss distortion is minimized,
In addition, an inexpensive optical card can be manufactured.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical card according to the present invention will be described in detail. The optical card of the present invention is provided with an embossed information area in a portion other than the optical recording area, and in an optical card in which a transparent substrate, an optical recording layer, an adhesive layer, and a back substrate are laminated in this order, the adhesive layer is A multilayer adhesive layer comprising a first adhesive layer, a core material layer and a second adhesive layer at least from the transparent substrate side, and the breaking elongation of the core material layer is 20
0% or less.

FIG. 1 is an explanatory view showing an example of the optical card of the present invention. FIG. 1 (a) is a plan view, and FIG. 1 (b) is AA '.
It is a line sectional view. In the figure, an optical card 1 of the present invention is shown.
A hard coat layer 2 for preventing scratches is provided on one surface of a transparent substrate 4 which is a support substrate for forming an optical recording layer, and a preformat pattern 3 comprising prepits and pregroups is provided on the other surface; An optical recording layer 5 on which information can be written by light such as a semiconductor laser is formed on the preformat pattern 3 of the transparent substrate 4, and a first adhesive layer 8 and a core material are formed on the optical recording layer 5. The back substrate 7 is bonded via a multilayer adhesive layer 6a composed of the layer 9 and the second adhesive layer 10, and a printed layer 11 for forming visible information is provided outside the back substrate 7. It consists of a configuration. Reference numeral 12 denotes an optical recording area, and reference numeral 13 denotes an emboss information area. A light beam for recording / reproducing enters from the transparent substrate 4 side, and enters the optical recording area 12.
The recording / reproduction of information is performed by the optical recording layer 5 of FIG.

FIG. 2 is an explanatory view showing another example of the optical card of the present invention. FIG. 2 (a) is a plan view, and FIG.
It is B 'line sectional drawing. The optical card shown in the figure has the same configuration as that of FIG. 1, but has a configuration in which the core material layer 9 of the multilayer adhesive layer 6a is formed only in a part of the emboss information area.

The transparent substrate 4 used in the present invention includes:
It is preferable to use a material which is excellent in smoothness, has a high transmittance of laser light used for recording and reproduction, and has a small optical distortion and does not break due to stress in embossing. Usually, a plastic sheet or film is used, for example, a polyester resin,
Polycarbonate-based resins, vinyl-based resins, polyimide-based resins, and the like are used, and particularly, polycarbonate-based resins having good laser light transmittance and low birefringence are preferable.

As the optical recording layer 5 used in the present invention, a conventionally known optical recording layer capable of recording information by light, for example, a laser beam can be used. For example, a metal, a metal compound, and an organic dye can be used. Optical recording layers can be used. It is preferable to use an optical recording layer containing an organic dye because the transmittance of visible light is high. Here, as the organic dye used for the optical recording layer, for example, polymethine dye, anthodiquinone derivative, cyanine dye, merocyanine dye, naphthoquinone dye, dioxazine compound, triphenodithiazine compound, phenanthrene derivative, phthalocyanine dye, Examples include a pyrylium-based dye, a croconium-based dye, an azo dye, and azulene. In particular, by using a polymethine dye as the organic dye, high recording sensitivity and good durability can be obtained, and the organic dye can be manufactured by coating, so that an inexpensive optical card can be manufactured.

The back substrate 7 used in the present invention can be used if it has excellent smoothness, and the same material as that of the transparent substrate can be used. However, a material which does not easily cause emboss distortion is preferable. For example, polyester-based resins, vinyl-based resins, and the like are preferable, and vinyl chloride resins having the least emboss distortion and being inexpensive are most preferable. It is preferable that visible information is formed on the back substrate by a printing layer. The printing configuration may be configured by only single-layer punching printing, or may be configured by a multilayer configuration including a transparent layer and an opaque layer.

The multilayer adhesive layer 6 used in the present invention
The first adhesive layer 8 in (a) can be used as long as it does not adversely affect the optical recording material and has an excellent adhesion between the transparent substrate and the core material. An adhesive having an adhesion to a transparent substrate of 1 kg / cm or more is preferable. For example, polymers and / or copolymers of vinyl monomers such as vinyl acetate, ethylene, acrylic acid and acrylamide, hot melt adhesives such as polyamide, polyester and atactic polypropylene, acrylics, polyisobutylene, SBR, butyl rubber and the like A tacky adhesive is used. In particular, hot-melt adhesives and tacky adhesives such as ethylene-vinyl acetate copolymer and ethylene-
Acrylic acid copolymers and acrylic pressure-sensitive adhesives are preferred because the production process can be simplified.

The multilayer adhesive layer 6a used in the present invention
The second adhesive layer 10 can be used as long as the adhesive has excellent adhesion between the back substrate and the core material layer. When the adhesion between the back substrate and the core material layer is 1 kg / cm or more, Certain adhesives are preferred. Any known adhesive may be used, for example, an instant adhesive, a UV-curable adhesive, a two-component mixed adhesive,
Thermosetting adhesives, tacky adhesives and hot melt adhesives can be used. In particular, it is preferable that the second adhesive be the same as the first adhesive layer because the manufacturing process can be simplified.

The core material layer 9 used in the present invention comprises:
It is desirable to use a material having a smooth plate-like shape and having flexibility and hardly causing emboss distortion, that is, a material having a breaking elongation of 200% or less, preferably 100% or less. For example, resin materials such as polyester, epoxy resin, vinyl chloride resin, polystyrene, polyethylene, polypropylene, polytetrafluoroethylene, polyamide, and polycarbonate are preferable. Among them, a vinyl chloride resin, particularly a hard vinyl chloride resin, is particularly preferable since it has a small breaking elongation and thus has a small emboss distortion and can be manufactured at low cost.

If the elongation at break of the core material layer 9 exceeds 200%, the distortion around the embossed information portion of the embossed card increases, which is not preferable. The elongation at break indicates the value of the elongation at break (%) measured by the test method of ASTM D 638.

The thickness of the above-mentioned first and second adhesive layers is 3 to 40 μm, and especially, the thinner the thickness of the adhesive is, the smaller the emboss distortion is, so that the thickness is preferably about 5 to 30 μm.
The thickness of the core material layer described above is 20 to 120 μm,
Particularly, considering the thickness of the entire card, the thickness is preferably 30 to 80 μm. The core material layer may be configured only in the emboss information area. The overall thickness of the multilayer adhesive layer is 30 to 150 μm, preferably 30 to 10 μm.
0 μm is desirable.

The adhesive layer is formed on both sides of the core material layer or on one side of the core material layer on the transparent substrate side and on the back substrate by a coating method such as gravure coating, spin coating, knife coating, die coating, and gear-driven die coating. And the transparent substrate on which the optical recording layer is formed and the back substrate are bonded together via a multilayer adhesive layer. The bonding can be performed by a conventionally known bonding method such as a roll press, a flat press, a hot roll press, and a hot flat press.

The optical card of the present invention may have a form in which other information areas such as an IC module, a magnetic tape, a visible information area and an OCR area are provided in addition to the optical recording area and the emboss information area.

[0028]

The present invention will be described more specifically with reference to the following examples.

Example 1 An optical card having the structure shown in FIG. 1 was manufactured by the following method. First, as the transparent substrate 4, a thickness of 0.4 mm,
mm, 85 mm wide polycarbonate substrate (trade name: P
C151 Teijin Chemicals Limited) was prepared. This substrate was washed and dried. A preformat pattern 3 was formed on the substrate by a hot press method. Next, a polymethine dye (trade name:
IR-820; manufactured by Nippon Kayaku Co., Ltd.)
% Diacetone alcohol solution was gravure coated and dried, and then an optical recording layer 5 having a thickness of 900 ° was formed.

Next, thickness 0.3 mm, length 54 mm, width 8
5 mm vinyl chloride resin substrate (trade name: PRN430)
(Manufactured by Tsutsunaka Plastics Co., Ltd.) is prepared as the back substrate 7, and visible information such as a logo is printed on the surface of the back substrate with white ink by screen printing. did.

Next, a core material 9 (trade name: Hishilex, elongation at break 25%, manufactured by Mitsubishi Plastics Co., Ltd.) having a thickness of 50 μm and made of vinyl chloride resin is prepared, and a gear drive die coater is provided on both sides of the core material. A 10 μm-thick ethylene methacrylate-based hot melt adhesive (trade name: O-4121, manufactured by Kurabo Co., Ltd.) 8 and 10 is formed with a trade name (GPD made by Yuri Roll Machine Co., Ltd.), and a multilayer adhesive layer having a thickness of 70 μm 6a.

The transparent substrate on which the optical recording layer was formed and the back substrate with the visible information on the outside were laminated via the multilayer adhesive layer 6a and bonded together by a hot roll press. Finally, a hard coat agent (trade name: Unidick 17-824-9; manufactured by Dainippon Ink and Chemicals, Inc.) is spin-coated on the surface of the transparent substrate opposite to the optical recording layer, and cured by UV light to form a hard coat layer. 2 to form an optical card.

Example 2 An optical card having the structure shown in FIG. 2 was manufactured by the following method. First, the same optical card 1 as in Example 1 was manufactured. However, as shown in FIG. 2 (b), a multilayer adhesive layer 6a having a core material formed only partially was used.

The method for producing this multilayer adhesive layer is as follows: a gear drive die coater (trade name: GPD, manufactured by Yuri Roll Machine Co., Ltd.) on a back substrate 7 made of a vinyl chloride resin substrate (trade name: PRN430, manufactured by Tsuchunaka Plastics Co., Ltd.) ) To form an acrylic pressure-sensitive adhesive 10 having a thickness of 10 μm, and further forming a 50 μm-thick vinyl chloride resin core material layer 9 (trade name: Hishilex Mitsubishi Plastics Co., Ltd.) only on the embossed information area. And a thickness of 10
An acrylic adhesive 8 having a thickness of μm was formed in the same manner, and an acrylic adhesive 8 having a thickness of 60 μm was formed in a portion other than the emboss information area, thereby forming a multilayer adhesive layer 6a having a thickness of 70 μm.

Comparative Example 1 An optical card having the structure shown in FIG. 3 was manufactured by the following method. First, the same optical card 1 as in Example 1 was manufactured. However, as shown in FIG. 3 (b), the adhesive layer is composed of only an adhesive. This adhesive is a 70 μm thick ethylene methacrylate-based hot melt adhesive (trade name: O-
4121 Crabeau Co., Ltd.) to form a single adhesive layer 6.

The optical cards of Examples 1 and 2 and Comparative Example 1
When embossed information such as embossed characters is formed on a conventional embossed magnetic card using an embosser (manual embosser NE-1600) manufactured by Nippon Kagaku Co., Ltd., the degree of emboss distortion is visually inspected. The distortion was equivalent to or slightly worse than that of the magnetic card with an emboss. However, the emboss distortion of the optical card of Comparative Example 1 was large, resulting in poor quality in appearance.

[0037]

As described above, according to the present invention,
An optical card was obtained which did not damage the optical recording layer, had good recording sensitivity, had high adhesion to the transparent substrate and the back substrate, and had an emboss distortion as small as a magnetic card.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an optical card of the present invention.

FIG. 2 is an explanatory view showing another example of the optical card of the present invention.

FIG. 3 is an explanatory view showing a conventional optical card.

[Explanation of symbols]

 Reference Signs List 1 optical card 2 hard coat layer 3 preformat pattern 4 transparent substrate 5 optical recording layer 6 adhesive layer 6a multilayer adhesive layer 7 back substrate 8 first adhesive layer 9 core material layer 10 second adhesive layer 11 printing Layer 12 Optical recording area 13 Emboss information area

Claims (5)

[Claims] 1. An optical card in which an emboss information area is provided in a portion other than the optical recording area, and a transparent substrate, an optical recording layer, an adhesive layer, and a back substrate are laminated in this order, the adhesive layer being at least transparent. An optical card comprising a multilayer adhesive layer comprising a first adhesive layer, a core material layer, and a second adhesive layer from the substrate side, wherein the elongation at break of the core material layer is 200% or less. 2. The optical card according to claim 1, wherein said first and second adhesive layers are formed of the same adhesive. 3. The optical card according to claim 1, wherein the first and second adhesive layers are made of a tacky adhesive or a hot-melt type adhesive. 4. The optical card according to claim 1, wherein said core material layer is made of a resin material. 5. The optical card according to claim 4, wherein said core material layer is formed of a vinyl chloride resin.