JP5205938B2 - Information recording medium - Google Patents

Description

  The present invention relates to an information recording medium such as a magnetic card such as a credit card or a cash card, a contact type IC card, or a non-contact type IC card, and more particularly to an information recording medium that hardly warps and is not easily damaged.

  In recent years, information recording media such as cash cards, credit cards, and ID cards have been widely used, and mainly used are polyvinyl chloride resins and vinyl chloride / vinyl acetate copolymer resins. Vinyl resins were common. Vinyl chloride resin is widely used as a material for information recording media such as cards because it is excellent in physical mechanical properties, embossability of character portions, etc., and the cost of the material is low.

  By the way, as the information recording medium is integrated into an IC, the information recording medium is required to have higher performance. In particular, there is a need for an information recording medium that is highly durable, highly heat resistant, and environmentally friendly.

However, polyvinyl chloride resins and vinyl chloride / vinyl acetate copolymer resins, which are base materials for conventional information recording media, have low heat resistance, and when the storage temperature is 80 ° C. or higher, the recording media may be deformed.
Also, when the polyvinyl chloride resin is discarded after use, hydrogen chloride gas is generated especially during incineration, which damages the incinerator and shortens its life. Although it depends on the incineration temperature, it is said that dioxins may be generated during incineration.

  Therefore, various resins have been proposed and modified as substitutes for the vinyl chloride resin. In the configuration of the information recording medium, a method of using a biaxially stretched polyethylene terephthalate resin as a front and back exterior base material is one of them (see, for example, Patent Document 1 and Patent Document 2).

The said prior patent document is shown.
Japanese Patent Application Laid-Open No. 2004-202817. Japanese Patent Application Laid-Open No. 2004-206349.

  However, although the above methods have improved heat resistance and durability, there are problems that warpage and deformation are likely to occur when a multi-sided sheet is used, and damage is easily caused when a product is made.

  The present invention has been made in view of the above-described problems relating to information recording media using biaxially stretched polyethylene terephthalate resin for the front and back exterior base materials, and has no warpage or deformation, is hardly scratched, and is heat resistant. It is an object of the present invention to provide an information recording medium having excellent properties and durability.

The invention of claim 1 of the present invention is an information recording medium in which a first exterior base material, a core sheet as a central base material, a second exterior base material, and at least three base materials are laminated in this order. The first exterior substrate and the second exterior substrate have a biaxially stretched polyethylene terephthalate resin or a biaxially stretched polyethylene naphthalate resin with protective resin layers formed on the front and back sides, and the first exterior base The material and the second exterior base material are configured with the same thickness, use the same material, and are laminated with the stretching direction aligned, and the protective resin layer is the same type of polyester resin, polyester on the front and back sides. The main component is any one of urethane resin, acrylic resin, and vinyl chloride / vinyl acetate copolymer resin, the thickness is 5 to 15 μm, and the front and back are the same thickness within a range of ± 0.5 μm, Protective resin In is an information recording medium characterized Rukoto such by additives consisting of a resin-based wax having a particle size of 1~20μm is added at a rate 0.1 to 5.0 percent by weight fraction.

As described above, according to the present invention, the first exterior base material and the second exterior base material have the protective resin layers formed on the front and back of the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin. , An information recording medium excellent in heat resistance and durability can be obtained. According to the present invention, the protective resin layers formed on the front and back of the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin are polyester resin, polyester urethane resin, acrylic resin, vinyl chloride / vinyl acetate copolymer. Since any one of the resins is a main component, the thickness is 5 to 15 μm, and the front and back are the same thickness within a range of ± 0.5 μm, there is almost no warpage even in a multi-sided sheet. Moreover, since the additive is added to the resin layer at a weight fraction of 0.1 to 5.0%, transparency can be maintained. Moreover, since the particle diameter of the additive is the same level as the thickness of the resin layer, it is difficult to be damaged. Additives (mainly waxes) are usually not round, but scale-like or elliptical. After laminating and laminating, the prescription should be determined at a level where there is no problem in physical properties.
In addition, the first exterior base material and the second exterior base material using the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin are laminated using the same material and aligned in the stretching direction. Therefore, the pulling force is balanced and the warp is eliminated.

The invention of claim 2 is the invention of claim 1, wherein the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin constituting the first exterior substrate and the second exterior substrate is thick. The information recording medium is characterized in that the thickness is in the range of 20 to 200 μm.
Thus, according to the present invention, the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin constituting the first exterior base material and the second exterior base material has a thickness in the range of 20 to 200 μm. In addition, since the first exterior base material and the second exterior base material have the same thickness, warpage hardly occurs in a single sheet, and printing on a printing press is possible.

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The invention according to claim 3 is the information recording medium according to claim 1 or 2, wherein the additive comprising the resin wax is any one of polyethylene wax, polyester wax, and fluorine wax. is there.

The invention according to claim 4 is the information recording according to any one of claims 1 to 3 , wherein a printing layer is provided on a front surface or a back surface of the protective resin layer. It is a medium.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a thermoplastic resin having low heat resistance that softens and flows at 90 to 150 ° C. is used for the core sheet. It is the information recording medium characterized by this.

As described above, according to the present invention, the core sheet uses a thermoplastic resin having low heat resistance that softens and flows at 90 to 150 ° C. Therefore, when embedding a magnetic tape with a thermal laminate, for example, Since the resin inside the sheet flows, the embedding load is reduced and the sheet is easy to smooth.

The invention according to claim 6 is the invention according to any one of claims 1 to 5 , wherein the information recording medium is a non-contact type IC card in which a non-contact IC chip and an antenna element are embedded in a core sheet. It is an information recording medium characterized by the above.

The invention according to claim 7 is the invention according to any one of claims 1 to 5 , wherein the information recording medium is a contact type IC card having a contact type IC card module provided on a card surface. Is an information recording medium.

The invention according to claim 8 is the invention according to any one of claims 1 to 5 , wherein the information recording medium is a magnetic card in which a magnetic recording layer is provided on a surface of a first exterior substrate. It is an information recording medium characterized by being.

  Thus, the information recording medium of the present invention has the following effects. That is, such an information recording medium is usually manufactured by imposing a large sheet on multiple sides, but on the front and back of a transparent biaxially stretched polyethylene terephthalate resin or biaxially stretched polyethylene naphthalate resin sheet, the same thickness is provided. Since the thermoplastic resin layer, which is a protective resin layer, is provided, there is no warpage in the sheet state, so printing can be performed using a printing machine in a large sheet state.

  A tape-like magnetic tape having an area smaller than the outer size of the card substrate can be smoothly embedded in the card substrate by heat lamination. Moreover, since the card | curd uses the resin sheet mainly using the extending | stretching polyethylene terephthalate resin or the extending | stretching polyethylene naphthalate resin, it becomes a card | curd which is hard to be damaged.

Furthermore, since the protective resin layer is mixed with a wax-based additive having a particle size comparable to the thickness of the resin layer, it is difficult to be damaged.
Includes magnetic cards and IC cards that are finished using a biaxially-stretched polyethylene terephthalate resin or a biaxially-stretched polyethylene naphthalate resin on the front and back sides. The card is excellent in crack resistance.

The present invention will be described in detail below based on one embodiment.
As shown in FIGS. 1 and 2, for example, the information recording medium (10) of the present invention includes a first exterior substrate (11), a core sheet (12) as a central substrate, and a second exterior substrate. The material (13) is an information recording medium in which these at least three substrates are laminated in this order.

  The first exterior base material (11) and the second exterior base material (13) have a protective resin layer (2) on the front and back of the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin (1). It is characterized by being formed.

  The biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin (1) constituting the first exterior substrate (11) and the second exterior substrate (13) has a thickness in the range of 20 to 200 μm. Preferably, the first exterior base material (11) and the second exterior base material (13) may have the same thickness. Further, the surface may be untreated, subjected to surface treatment such as corona discharge, or attached with an easy adhesion layer. Furthermore, what performed the foaming process by the extending process is also contained.

  The protective resin layer (2) is mainly composed of any one of a polyester resin, a polyester urethane resin, an acrylic resin, and a vinyl chloride / vinyl acetate copolymer resin, such as a polycarbonate resin and a polyphenylene oxide resin. Engineering plastics with high heat resistance are also included in the components. The thickness of the protective resin layer (2) is 5 to 15 μm, and the thickness is the same on the front and back sides within a range of ± 0.5 μm.

  Thus, the protective resin layer (2) of the same thickness is formed on the front and back of the biaxially stretched polyethylene phthalate resin or the biaxially stretched polyethylene naphthalate resin (1), and the first exterior sheet (11) and the second Since it is comprised by the same thickness as the exterior sheet | seat (13), there is almost no curvature. Until now, protective resin layers of different types and different thicknesses have been applied to the front and back sides. The sheet | seat which apply | coated different resin to this front and back was 350 mm x 350 mm, and the curvature of about 0.5-4.0 cm had generate | occur | produced. On the other hand, in the sheet | seat of this invention, it is the curvature amount within 0-0.3 mm.

Furthermore, an additive is added to the protective resin layer (2) in a proportion of 0.1 to 5.0% by weight. Examples of the additive include polyethylene wax, polyester wax, fluorine wax, and other resin waxes. The transparency of the protective resin layer is maintained by setting the addition amount to 0.1 to 5.0% by weight.
In addition to such organic compounds, silicon compounds such as silica, calcium carbonate, and inorganic compounds such as titanium oxide and carbon black are also included.

  When these additives are added to the resin, the particle diameter is set to 1 to 20 μm, which is the same level as the thickness of the protective resin layer (2). This makes the sheet difficult to be damaged.

  The protective resin layer (2) is obtained by diluting the above resin component to which an additive has been added into a solvent to form a solution, and biaxially stretched polyethylene terephthalate resin or biaxially stretched polyethylene naphthalate resin by a known coating method such as gravure coating. It can coat on both surfaces of (1).

  Thus, since the exterior base material in which the protective resin layer in which the additive mainly composed of wax is mixed is present on the front and back of the information recording medium, the information recording medium is hardly damaged.

  The core sheet (12) serving as the central substrate has a low heat resistance, specifically, a thermoplastic resin that softens and flows at 90 to 150 ° C., such as vinyl chloride resin or PET-G (manufactured by EASTMAN CHEMICAL) ) Can be preferably used.

  By using a thermoplastic resin with low heat resistance for the core sheet as the central base material, the resin of the central base material flows the fastest, so the load on the exterior base material and its printing is absorbed and the appearance quality deteriorates. Reduce (distortion, cracking, etc. of the pattern).

By using the biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin as the first exterior substrate and the second exterior substrate, the dominating force on the shape of the card is maximized.
The combination of PET-G and the first exterior substrate and the second exterior substrate on the core sheet using PET-G had a static bending strength of 23 mm. On the other hand, in the combination of the core sheet using PET-G and the first exterior base material and the second exterior base material made of biaxially stretched polyethylene terephthalate resin, the static bending strength is 17 mm, the waist is raised, and it is hard It becomes a card.

  Next, the information recording medium of the present invention will be described in more detail with reference to specific examples.

In order to produce the first exterior substrate (11) and the second exterior substrate (13), first, a transparent biaxially stretched polyethylene terephthalate resin sheet (1) having a thickness of approximately 350 mm × 350 mm and a thickness of 0.2 mm is used. Got ready.
In addition, several sheets of white PET-G (manufactured by EASTMAN CHEMICAL) having thicknesses of 100 μm, 130 μm, and 180 μm were prepared as core sheets to be the central substrate.

  Separately, a resin for forming the protective resin layer (2) using a polyester resin as a main component and a solution in which an additive such as polyethylene wax is added by 3.0% by weight with respect to the resin amount and dissolved in a solvent. Prepared as a solution. The particle size of the additive was in the range of 1 to 20 μm.

  This resin solution was apply | coated to the front and back both surfaces of the biaxially-stretched polyethylene terephthalate resin sheet (1) prepared previously by the gravure coating method, and the protective resin layer (2) was formed. At that time, the thickness of the protective resin layer was 10 μm, and the difference in thickness between the protective resin layer on the front side and the protective resin layer on the back side was within the range of ± 0.5 μm.

  The design print (6) of the individual pattern was performed on the protective resin layer of the exterior substrate by an offset printing method.

  Next, the magnetic tape (5) was affixed on the printing layer (6), and the magnetic tape (5) was embedded in the exterior base material (11) by the surface lamination. Here, the protective resin layer (2) formed on the exterior substrate serves to ensure the smoothness of the edge of the magnetic tape.

  A plurality of white PET-G sheets were laminated and heat-laminated so as to sandwich the non-contact IC inlet (4), thereby producing a core sheet (3) which is an IC inlet built-in sheet. In FIG. 2, the core sheet (3) is shown in an integrated state after thermal lamination, but in the state before lamination, a plurality of white PET-G sheets are laminated.

A transparent biaxially stretched polyethylene terephthalate sheet (1) is coated on both the front and back surfaces of the core sheet (3) and coated on both front and back surfaces with a protective resin layer that will be the previously prepared exterior sheet (11, 13). Thus, a multi-sided sheet (20) on which a large number of information recording media are attached is produced by heat lamination. In that case, a 1st exterior base material (11) and a 2nd exterior base material (13) are laminated | stacked, aligning an extending direction. In order to improve card strength, it is desirable to arrange the sheet flow direction (MD direction) in the longitudinal direction of the card.

  Finally, the multi-sided sheet (20) is cut and separated into a single size of the information recording medium to obtain the desired information recording medium (10) of Example 1.

  In this embodiment, the information recording medium (10) has been described as a non-contact type IC card with a magnetic stripe. However, the information recording medium (10) can also be applied only to a magnetic card. It can also be applied to contact IC cards by embedding by technology.

It is a plane explanatory view showing one example of a multi-sided sheet in which a plurality of information recording media of the present invention are arranged. It is a section explanatory view of the information recording medium of the present invention.

1 Biaxially stretched polyethylene terephthalate, Biaxially stretched polyethylene naphthalate 2 Protective resin layer 3 IC
4 ... Non-contact IC inlet 5 ... Magnetic tape 6 ... Print layer 10 ... Information recording medium 11 ... First exterior substrate 12 ... Core sheet 13 ... 2nd exterior substrate 20 ... Many sides Attached sheet

Claims (8)

An information recording medium in which a first exterior base material, a core sheet as a central base material, and a second exterior base material, and at least three base materials are laminated in this order,
The first exterior substrate and the second exterior substrate have a protective resin layer formed on the front and back of a biaxially stretched polyethylene terephthalate resin or a biaxially stretched polyethylene naphthalate resin,
In addition, the first exterior base material and the second exterior base material are configured with the same thickness, use the same material, and are laminated with the stretching direction aligned,
The protective resin layer has the same type of polyester resin, polyester urethane resin, acrylic resin, vinyl chloride / vinyl acetate copolymer resin of the same type on the front and back, and a thickness of 5 to 15 μm. Within the range of ± 0.5μm, the front and back are the same thickness,
The protective resin layer, the information recording medium characterized Rukoto such are added additive consisting of a resin-based wax having a particle size of 1~20μm at a rate 0.1 to 5.0 percent by weight fraction.   The biaxially stretched polyethylene terephthalate resin or the biaxially stretched polyethylene naphthalate resin constituting the first exterior base material and the second exterior base material has a thickness in the range of 20 to 200 µm. 1. The information recording medium according to 1. The information recording medium according to claim 1 or 2, wherein the additive comprising the resin wax is any one of polyethylene wax, polyester wax, and fluorine wax .   The information recording medium according to claim 1, wherein a printed layer is provided on the front surface or the back surface of the protective resin layer.   5. The information recording medium according to claim 1, wherein the core sheet is made of a thermoplastic resin having low heat resistance that softens and flows at 90 to 150 ° C. 5.   6. The information recording medium according to claim 1, wherein the information recording medium is a non-contact type IC card in which a non-contact IC chip and an antenna element are embedded in a core sheet.   6. The information recording medium according to claim 1, wherein the information recording medium is a contact IC card having a contact IC card module provided on a card surface. The information recording medium according to claim 1, wherein the information recording medium is a magnetic card having a magnetic recording layer on a surface of a first exterior substrate.

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