JP2004227176A - Plastic card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a warp in emboss processing and prevent the shape of a module from being embossed to the surface. <P>SOLUTION: In a plastic card, two-layered core materials and one-layered covering materials each are laminated in order on both sides of an antenna module layer, and the layers are vertically symmetrical with the antenna module layer as the center. In addition, a resin mixing ratio, that is, the mixing ratio by weight of an amorphous polyethylene terephthalate resin to a polycarbonate resin in one layer of the two-layered core material is 70:30 to 50:50, and the mixing ratio by weight of the amorphous polyethylene terephthalate resin to the polycarbonate resin in the other layer of the two-layered core material is 100:0 to 50:50. The content of the polycarbonate in the whole plastic card is 30 to 50 wt.%. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

表１から明らかなように、カード全体におけるポリカーボネート樹脂の配合比率が３０重量％〜５０重量％と適正に設定され、各コア材２ａ，２ｂのポリカーボネート樹脂の配合比率も適正に設定されたプラスチックカード（実験例４〜実験例１０）（いずれも実施例に相当する。）は、高温環境後の外観（浮き出し）が良好であり、カードの反り量もＪＩＳ規格内（２．５ｍｍ以下）となった。
【００８５】
これに対し、コア材がポリカーボネート樹脂を含まないＰＥＴＧ樹脂のみの構成の実験例１及び実験例１５、さらにはポリカーボネート樹脂を含んでも配合比率が規定よりも少ない実験例２及び実験例３は、外観上に問題がある。逆に、ポリカーボネート樹脂のカード全体における配合比率が５０％を越える実験例１１乃至実験例１４、さらには実験例１６は、カードの反り量が大きく、その値がＪＩＳ規格である２．５ｍｍを上回っており、カード基材に用いるには不適切であることがわかる。
【００８６】
【発明の効果】
以上の説明からも明らかなように、本発明のプラスチックカードにおいては、ＰＥＴＧ樹脂にポリカーボネート樹脂を配合したポリマーアロイ樹脂をカード基材であるコア材に用いるとともに、層構成やカード全体でのポリカーボネート樹脂の配合比率を最適化しているので、高温環境下での保存の後にも外観を損なうことがなく、エンボス加工後のカードの反り量もＪＩＳ規格値内とすることが可能である。
【図面の簡単な説明】
【図１】本発明を適用したプラスチックカードの層構成を示す概略断面図である。
【符号の説明】
１ アンテナモジュール層、２ コア材、２ａ コア材（アンテナモジュール層側）、２ｂ コア材（外装材側）、３ 外装材、４ ＩＣチップ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plastic card used for a magnetic card, an embossed card, a contact / non-contact IC card, and the like, and particularly to a plastic card having an antenna module layer therein.
[0002]
[Prior art]
For example, magnetic recording media have been widely used in the fields of cash cards, credit cards, ID cards, and the like. Simple information such as the cardholder's name and member number can be magnetically recorded on the magnetic recording medium, and the cardholder is authenticated based on the information. However, the amount of information that can be recorded on a magnetic recording medium is limited, and information that is magnetically recorded can be easily read, so that security concerns remain.
[0003]
In recent years, there has been a tendency to emphasize security enhancement in order to prevent leakage of personal information, and IC cards using an IC chip as a recording medium have attracted attention in the sense of achieving higher security and are becoming mainstream. . In particular, non-contact IC cards are often used in boarding systems, security systems, and the like, and their spread has been remarkable.
[0004]
By the way, these cards are all made by hot pressing, and most of the materials are vinyl chloride resins from the viewpoint of functions such as workability. However, the vinyl chloride resin is excellent in embossing, but has a drawback such as inferior durability in repeated bending. In recent years, environmental issues have been emphasized, and one of the problems is the environmental burden caused by toxic gas generated during incineration. Further, as a physical property defect of polyvinyl chloride resin (PVC) generally used as a card material up to now, low heat resistance is cited. In general, PVC softens and deforms at about 60 ° C., making it unsuitable for high temperature applications. Therefore, a PVC substitute card material is desired from the viewpoint of these physical properties and environmental problems.
[0005]
Therefore, as alternative materials, studies are being made mainly on halogen-free thermoplastic resins such as non-vinyl chloride resins such as polyethylene resin, polypropylene resin, polyester resin, polycarbonate resin and polyacryl resin (for example, Patent Document 1). Or Patent Document 3).
[0006]
However, when these resins are used alone, the physical properties of the card are inferior to PVC, so the card cannot meet the standard values specified for the card, especially in the JIS standard, and has a physical property that meets the JIS standard. Wood is needed. In addition, when a plastic material in consideration of heat resistance, for example, a polycarbonate resin is used for the card base material, when the card is embossed, the peripheral portion of the embossed portion is also deformed by being pulled by the deformation of the embossed portion. Is curled.
[0007]
Under such circumstances, non-crystalline polyethylene terephthalate has attracted attention as a card base material replacing PVC (for example, see Patent Documents 4 and 5). The non-crystalline polyethylene terephthalate resin is a resin in which 10 to 70 mol% of the ethylene glycol component in the non-crystalline polyethylene terephthalate is replaced with cyclohexane dimethanol (hereinafter referred to as a PETG resin). By using such a card, it is possible to provide a card having excellent embossability while considering environmental issues.
[0008]
[Patent Document 1]
JP-A-11-302526
[0009]
[Patent Document 2]
JP 2001-283175 A
[0010]
[Patent Document 3]
JP 2002-37996 A
[0011]
[Patent Document 4]
JP-A-11-232424
[0012]
[Patent Document 5]
JP-A-2002-96440
[0013]
[Problems to be solved by the invention]
However, although the PETG resin is excellent in embossability, in a card in which an antenna module layer is embedded like a non-contact type IC card, a high temperature storage environment such as a temperature of 70 ° C. and a relative humidity of 60% is used. After long-term storage below, a phenomenon is seen in which the shape of the module stacked inside the card emerges on the surface. Such protrusion on the surface of the module shape greatly impairs the appearance of the card, and its improvement is desired.
[0014]
The present invention has been proposed in view of such circumstances, and provides a plastic card that is excellent in embossability and excellent in heat resistance, for example, capable of reducing appearance deformation after high-temperature storage. With the goal.
[0015]
[Means for Solving the Problems]
The present inventors have conducted various studies over a long period of time in order to achieve the above-mentioned object. As a result, a polymer alloy resin obtained by adding a polycarbonate resin, which is a resin having excellent heat resistance, to a PETG resin having good embossability is used as a core material, and the layer structure and the polycarbonate resin in each layer or the entire card are used. It has been concluded that by optimizing the mixing ratio and the like, both heat resistance and embossability can be achieved.
[0016]
The plastic card of the present invention has been completed based on such knowledge, and two layers of core material and one layer of exterior material are sequentially laminated on both sides of the antenna module layer, respectively. Plastic card having a vertically symmetrical layer structure, wherein the weight ratio of non-crystalline polyethylene terephthalate resin: polycarbonate resin in one of the core materials of the two layers is 70:30 to 50. : 50, the resin mixing ratio in the other core material is non-crystalline polyethylene terephthalate resin: polycarbonate resin = 100: 0 to 50:50 by weight, and the ratio of the polycarbonate resin in the entire card is 30 to 50 weight. %.
[0017]
Cards using PETG resin as the card base material are excellent in embossability, but in terms of heat resistance, the modules in the card appear to stand out after the environmental test, which hinders the appearance. Therefore, in the present invention, heat resistance (high temperature) is obtained by adding a polycarbonate resin having a glass transition point higher than that of the PETG resin to the PETG resin to form a polymer alloy resin, and using the polymer alloy resin for the core material as the card base material. (Reducing appearance deformation after storage) and embossability. However, at this time, the layer structure and the proportion of the polycarbonate resin in the entire card are important, and by optimizing them as in the present invention, it is possible to achieve both heat resistance and embossing workability for the first time.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a plastic card to which the present invention is applied will be described in detail with reference to the drawings.
[0019]
FIG. 1 shows an example of application to a non-contact IC card. As shown in FIG. 1, this non-contact IC card has an antenna module layer 1 having an antenna pattern formed on its surface, and a core material 2 and an exterior material 3 sequentially bonded on both sides thereof.
[0020]
The antenna module layer 1 is formed by laminating a metal thin film on a polymer film by dry lamination, vapor deposition, plating, or the like, and forming a thin layer coil as an antenna pattern by, for example, ion etching the metal thin film. An IC module (electronic module) is configured by connecting an IC chip to the IC module. That is, for example, an antenna pattern is formed by patterning a metal thin film such as an aluminum thin film on the surface of a polymer film base made of polyethylene terephthalate or the like. The antenna module layer 1 is mounted with an IC chip 4 connected to an antenna pattern, and various information is recorded on the IC chip 4. Then, the recorded information is transmitted to the outside via an antenna pattern formed on the surface of the antenna module layer 1.
[0021]
When such a non-contact IC module (antenna module layer 1) is installed in a plastic card, it is desirable to sandwich it between a pair of core materials, for example. Therefore, in this example, the core material 2 and the exterior material 3 are sequentially attached to both sides of the antenna module layer 1.
[0022]
Here, the core members 2 each have a two-layer structure, and are stacked in the order of a first core member 2a and a second core member 2b from the antenna module layer 1 side. Therefore, the layer configuration on one side of the antenna module layer 1 is a three-layer configuration of the first core material 2a, the second core material 2b, and the exterior material 3.
[0023]
The core members 2a and 2b are, for example, white, and the exterior member 3 is, for example, transparent. When the printing is performed, the printing is performed between the core material 2 and the exterior material 3. At this time, the printing may be performed on the surface of the core material 2 b or the pattern may be inverted inside the exterior material 3 and printed. Good. However, at this time, if UV curable ink is used, a problem occurs in the adhesion between the exterior material 3 and the core material 2b, so care must be taken.
[0024]
In the first core member 2a of the core member 2 arranged on the antenna module layer 1 side, a through hole is formed corresponding to the IC chip 4, and the IC chip 4 is inserted in the through hole. It is housed. Note that the other core material (the second core material 2b) of the core material 2 does not have such a through hole.
[0025]
In the plastic card having the above-described layer configuration, it is preferable that the core material 2 and the exterior material 3 are symmetrically stacked on the antenna module layer 1. For example, the thickness of each layer is preferably vertically symmetrical from the center of the card. If the upper and lower thickness configurations are asymmetric or the antenna module layer 1 is off center, the card is likely to be warped.
[0026]
The layers (the antenna module layer 1, the core material 2, and the exterior material 3) thus laminated are integrated by welding, for example, by a hot press to form a plastic card.
[0027]
As described above, the plastic card of this example is formed by sandwiching the antenna module 1 between the core material 2 and the exterior material 3 which are card base materials, and laminating by hot pressing. Various circumstances are assumed as the usage environment of the plastic card. For example, if PETG resin used as a substitute material for PVC is used for the card base material, for example, the non-contact type in which the antenna module 1 is sandwiched between the card base materials When an IC card is stored for several hours in a high-temperature environment such as a temperature of 70 ° C. and a relative humidity of 60%, the antenna sandwiched between the card base materials is deformed from a smooth state before storage, and finally the antenna shape is changed. This causes the embossment.
[0028]
If a thermoplastic resin material (specifically, PC resin or the like) having improved heat resistance is used for the card base material for the purpose of avoiding this, there is a problem that the card is curled by embossed character processing.
[0029]
Therefore, in the plastic card of the present invention, these PETG resins and thermoplastic resin materials are not used alone, but a polycarbonate resin, which is a thermoplastic resin having high heat resistance, is added to PETG resin having excellent embossability. It is a polymer alloy resin and a plastic card that can satisfy both of the above properties.
[0030]
Specifically, the resin blending ratio of one of the core materials 2a and 2b of the two layers is PETG resin (non-crystalline polyethylene terephthalate resin): polycarbonate resin = 70: 30 to 50:50 by weight ratio. The resin blending ratio of the other core material is set to be PETG resin: polycarbonate resin = 100: 0 to 50:50 by weight.
[0031]
PETG resin is a polyethylene terephthalate resin obtained by substituting 10 to 70 mol% of an ethylene glycol component with cyclohexane dimethanol. By the substitution, the copolymerized polyester resin becomes a non-crystalline resin to improve heat-fusibility. And the elastic modulus does not decrease. Therefore, the use of PETG resin for the core material 2 can suppress the occurrence of curl due to embossing. However, if it is used alone, the emergence of the antenna becomes a problem. This prevents this.
[0032]
In addition, as a result of intensive studies, not only the blending of the core material 2 but also the proportion of the polycarbonate resin in the entire card material (the exterior material 3 and the core material 2) is important. Thus, it was found that both the suppression of the curl and the prevention of the protrusion of the antenna can be achieved.
[0033]
Further, at that time, it is necessary that the card base material has at least a three-layer structure via the antenna module 1, and by selecting the mixing ratio and the thickness of the polycarbonate resin in each layer, the proportion of the polycarbonate resin in the entire card material is determined. Must be set in the appropriate range.
[0034]
For example, when the A, B, and C layers are sequentially arranged from the surface layer of the card (that is, the exterior material 3 is the A layer, the core material 2b is the B layer, the core material 2a is the C layer, and the thickness of each layer is A, B, and C). The thickness of the layer A is preferably 0.46 to 0.50 when expressed as A / (B + C), and the layer A is preferably a resin containing 70% by weight of a polycarbonate resin. Further, when the ratio of the polycarbonate resin added to the resin of the layer B is 50% by weight or less and the thickness is expressed as B / A, 0.6 to 0.8, and the polycarbonate added to the resin of the layer C It is preferable that the ratio of the resin is 50% by weight or less and the thickness is 1.2 to 1.4 when expressed as C / A. With such a setting, the warpage of the card after embossing does not exceed the JIS standard value, and the antenna emergence in a high temperature environment such as a temperature of 70 ° C. and a relative humidity of 60% is performed by using the PETG resin alone as the card base. It can be reduced more than the card used as material.
[0035]
The above-mentioned material (a material obtained by adding a polycarbonate resin to a PETG resin) has excellent properties in terms of adhesive strength to the exterior material 3 when it is made into a card because it has good heat-sealing properties. X 6301-1998 Sufficiently meets the requirements of 8.1.8, and also satisfies the condition of 12 N / cm or less, at which material destruction occurs, and adhesion between the core material 2 as a card base material and the exterior material 3. It is also satisfactory in terms of sex.
[0036]
In addition, as a non-PVC-based material used for the exterior material 3, besides polycarbonate, acrylonitrile-butadiene-styrene resin (ABS), polyester such as polyethylene terephthalate (PET), PETG resin, and polybutylene terephthalate resin (PBT). Representative. In addition, polystyrene, polyamide, polymethyl methacrylate, acrylonitrile-styrene copolymer, cellulose propionate, cellulose acetate butyrate, and the like can also be used. In addition, materials obtained by polymerizing these materials, specifically, polycarbonate / PETG, polycarbonate / PBT, polycarbonate / ABS, and the like are also suitable.
[0037]
【Example】
Hereinafter, specific examples to which the present invention is applied will be described based on experimental results.
[0038]
Experimental example 1
In the card base material, the core material 2 has a two-layer structure of the core materials 2a and 2b, and no polycarbonate resin is added to the PETG resin as a material of each of the core materials 2a and 2b (the blending ratio of the polycarbonate is 0% by weight). ) While using resin, the thickness C of the core material 2a (C layer) on the antenna module layer 1 side is C / A = 1.4 with respect to the thickness A of the exterior material 3 (A layer), and the core on the exterior material 3 side. The thickness B of the material 2b (B layer) was set so that B / A = 0.8 with respect to the thickness A of the exterior material 3.
[0039]
The core material 2 on both sides is made symmetrical via the antenna module layer 1 at the center of the card, and further, a polycarbonate / PBT (weight ratio of 70/100) having a thickness such that A / (B + C) = 0.46 is provided outside the core material 2. 30) A sheet made of an alloy resin was provided as the exterior material 3 to form a five-layer structure, and then heat-sealed at a temperature of 130 ° C. and a pressure of 1.0 MPa. This was punched into a predetermined size to produce a plastic card. As a module mounted on the antenna module layer 1, a so-called non-contact IC module in which an IC chip is connected to a thin-layer coil having a step of 15 μm or more is used.
[0040]
Experimental example 2
A polymer alloy resin in which a polycarbonate resin was mixed with a PETG resin (a compounding ratio of the polycarbonate resin was 15% by weight) was used for the core material 2b on the exterior material 3 side. Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0041]
Experimental example 3
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin was blended with a PETG resin (the blending ratio of the polycarbonate resin was 15% by weight) was used. Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0042]
Experimental example 4
The core material 2a on the antenna module layer 1 side is made of a resin in which a polycarbonate resin is not compounded with PETG resin (the compounding ratio of the polycarbonate resin is 0% by weight), and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.2 with respect to the thickness A.
[0043]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 30% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 0.8.
[0044]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0045]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0046]
Experimental example 5
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a PETG resin is blended with a polycarbonate resin (the compounding ratio of the polycarbonate resin is 50% by weight). It was set so that B / A = 0.6 with respect to the thickness A. Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0047]
Experimental example 6
A polymer alloy resin in which a polycarbonate resin was mixed with a PETG resin (the compounding ratio of the polycarbonate resin was 50% by weight) was used for the core material 2b on the exterior material 3 side. Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0048]
Experimental example 7
For the core material 2a on the antenna module layer 1 side and the core material 2b on the exterior material 3 side, a polymer alloy resin obtained by mixing a polycarbonate resin with a PETG resin (the mixing ratio of the polycarbonate resin was 30% by weight) was used. Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0049]
Experimental example 8
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin was blended with a PETG resin (the blending ratio of the polycarbonate resin was 50% by weight) was used. Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0050]
Experimental example 9
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin is mixed with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight) is used, and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.4 with respect to the thickness A.
[0051]
The core material 2b on the exterior material 3 side is made of a resin in which the PET resin is not blended with the polycarbonate resin (the blending ratio of the polycarbonate resin is 0% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. 3 was set so that B / A = 0.6 with respect to the thickness A.
[0052]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0053]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0054]
Experimental example 10
The core material 2a on the antenna module layer 1 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 30% by weight), and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.2 with respect to the thickness A.
[0055]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 0.8.
[0056]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0057]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0058]
Experimental Example 11
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin is mixed with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight) is used, and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.2 with respect to the thickness A.
[0059]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 30% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 0.8.
[0060]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0061]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0062]
Experimental Example 12
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin is mixed with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight) is used, and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.2 with respect to the thickness A.
[0063]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 0.8.
[0064]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0065]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0066]
Experimental Example 13
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 75% by weight) is used, and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.2 with respect to the thickness A.
[0067]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 20% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 0.8.
[0068]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0069]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0070]
Experimental Example 14
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a PETG resin is blended with a polycarbonate resin (the blending ratio of the polycarbonate resin is 20% by weight) is used, and the thickness C of the core material 2a on the antenna module layer 1 side is an exterior material. 3 was set so that C / A = 1.2 with respect to the thickness A.
[0071]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a PET resin is mixed with a polycarbonate resin (the compounding ratio of the polycarbonate resin is 75% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 0.8.
[0072]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.50 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0073]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0074]
Experimental example 15
The thickness C of the core material 2a on the antenna module layer 1 side is C / A = 1.75 with respect to the thickness A of the exterior material 3, and the thickness B of the core material 2b on the exterior material 3 side is relative to the thickness A of the exterior material 3. B / A = 1.0.
[0075]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 at the center of the card, and a polycarbonate / PBT (weight ratio of 70/70) having a thickness such that A / (B + C) = 0.36 is provided outside the core material 2. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0076]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0077]
Experimental Example 16
For the core material 2a on the antenna module layer 1 side, a polymer alloy resin in which a polycarbonate resin is mixed with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight) is used, and the thickness C of the core material 2a on the antenna module layer 1 side is the exterior material. 3 was set so that C / A = 1.75 with respect to the thickness A.
[0078]
The core material 2b on the exterior material 3 side is made of a polymer alloy resin in which a polycarbonate resin is blended with PETG resin (the compounding ratio of the polycarbonate resin is 50% by weight), and the thickness B of the core material 2b on the exterior material 3 side is the exterior material. The thickness A was set so that B / A = 1.0.
[0079]
Further, the core material 2 on both sides is symmetrical via the antenna module layer 1 in the center of the card, and the outside thereof has a thickness of polycarbonate / PBT (weight ratio of 70/70) such that A / (B + C) = 0.36. / 30) A sheet made of an alloy resin was disposed as the exterior material 3 to form a five-layer structure.
[0080]
Otherwise, a plastic card was manufactured in the same manner as in Experimental Example 1.
[0081]
Experimental Example 17
A plastic card was prepared in the same manner as in Experimental Example 1, except that the core material on both sides of the antenna module layer 1 was a single layer, and that the core material was PVC (trade name: C-4636, manufactured by Mitsubishi Plastics, Inc.). Produced.
[0082]
With respect to each of the plastic cards produced as described above, the presence or absence of the protrusion of the antenna shape and the warpage of the embossed card were measured. Here, the prominence of the antenna shape is as follows. After the plastic card is stored at a temperature of 70 ° C. and a relative humidity of 60% for 3 days, the appearance of the antenna is visually observed.場合 indicates that the antenna shape was prominent (storage appearance) after storage at high temperature, and × indicates that the protrusion (exterior appearance) of the antenna shape after storage at high temperature was intense and clearly visible.
[0083]
The warpage of the card after embossing can be obtained by engraving the character "8" using a trade name of LOGIKA EMBOSER VERTIGO manufactured by Showa Information Equipment Co., Ltd. on a line of 19 lines, a total of 19 lines, and then warping the card (mm). Was measured. The warpage was measured according to JIS X6305.1.1. Table 1 shows the results.
[0084]
[Table 1]

As is clear from Table 1, the plastic card in which the blending ratio of the polycarbonate resin in the entire card is properly set to 30% by weight to 50% by weight, and the blending ratio of the polycarbonate resin in each of the core materials 2a and 2b is also properly set. (Experimental Examples 4 to 10) (all correspond to Examples) show good appearance (embossing) after high-temperature environment, and the amount of warpage of the card is within the JIS standard (2.5 mm or less). Was.
[0085]
In contrast, Experimental Examples 1 and 15 in which the core material was composed of only PETG resin containing no polycarbonate resin, and Experimental Examples 2 and 3 in which the blending ratio was lower than the specified value even though the polycarbonate resin was contained, There is a problem above. Conversely, in Experimental Examples 11 to 14 and Experimental Example 16 in which the blending ratio of the polycarbonate resin in the entire card exceeds 50%, the amount of warpage of the card is large, and the value exceeds the JIS standard of 2.5 mm. It is clear that this is not suitable for use as a card base material.
[0086]
【The invention's effect】
As is clear from the above description, in the plastic card of the present invention, a polymer alloy resin in which a polycarbonate resin is blended with a PETG resin is used for the core material as the card base, and the polycarbonate resin in the layer structure and the entire card is used. Is optimized, so that the appearance is not impaired even after storage in a high temperature environment, and the amount of warpage of the card after embossing can be within the JIS standard value.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a layer structure of a plastic card to which the present invention is applied.
[Explanation of symbols]
Reference Signs List 1 antenna module layer, 2 core material, 2a core material (antenna module layer side), 2b core material (exterior material side), 3 exterior material, 4 IC chip

Claims (5)

A plastic card having a two-layer core material and a one-layer exterior material sequentially laminated on both sides of an antenna module layer, respectively, and having a vertically symmetric layer configuration around the antenna module layer,
Non-crystalline polyethylene terephthalate resin: polycarbonate resin = 70: 30 to 50:50 in weight ratio in one core material of the two-layer core material, and resin mixing ratio in the other core material is weight ratio. And amorphous polyethylene terephthalate resin: polycarbonate resin = 100: 0 to 50:50,
A plastic card, wherein the proportion of the polycarbonate resin in the whole card is 30 to 50% by weight. 2. The plastic card according to claim 1, wherein an IC chip is mounted on the antenna module layer, and a through-hole corresponding to the IC chip is formed in a core material on the antenna module layer side. 2. The plastic card according to claim 1, wherein the plastic card is embossed. 2. The plastic card according to claim 1, wherein the amorphous polyethylene terephthalate is a resin in which 10 to 70 mol% of an ethylene glycol component in polyethylene terephthalate is substituted with cyclohexanedimethanol. The plastic card according to claim 1, wherein the core material and the exterior material are laminated on the antenna module layer by laminating by a hot press.

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