JP2002248724A - Laminated body for card substrate, and card using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated body for a card substrate which is excellent in heat-resistance, and has a processing suitability being close to a vinyl chlorate resin, and wherein curling after an emboss-forming process is reduced, and a chlorine gas is not generated at the time of the discard-incineration, and a card using the laminated body for the card substrate. SOLUTION: For this laminated body for the card substrate, two layers or more of a heat-resistant polyester based resin are made the main body. In such a laminated body for the card substrate, the resin composition for a front surface layer sheet 3 and a rear surface layer sheet 4 is the same. However, on the rear surface layer sheet, a sheet in which a lubricant such as methyl stearate, and a filling agent or filler such as calcium carbonate are mixed is laminated for the laminated body for the card substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium used for a cash card, a credit card, an ID card (identification card), a membership card, a prepaid card, and the like. The present invention relates to a card which does not deform even when used in home electric appliances such as in-vehicles and computers which may be used, and which is more easily discarded when discarded after use.

[0002]

2. Description of the Related Art Conventionally, magnetic recording media have been widely used in the fields of cash cards, credit cards, ID cards and the like, and are mainly made of polyvinyl chloride (PVC) resin or vinyl chloride / vinyl acetate. Copolymers are used, and polyvinyl chloride resin is particularly common. Polyvinyl chloride resin is excellent in physical mechanical properties and embossability of a character portion, and is widely used as a perfect material for card materials.

As a general card manufacturing method, a white vinyl chloride (PVC) substrate is printed by a known printing method such as offset printing, gravure printing, screen printing, and the like.
After laminating a highly transparent PVC sheet (oversheet) on both sides, a magnetic tape is transferred, integrated by heat fusion with a heating press, and punched out with a mold of a predetermined size to form a card shape. Although the thermal transfer type magnetic tape protrudes from the card surface after the transfer, there is a step,
It is embedded at the time of heat fusion with a heating press machine, and is flush with the card surface.

The role of a magnetic tape in a magnetic card is as follows.
It has an important role to record the unique data possessed by the individual and to be able to read it when used.If this magnetic tape is not flush with the surface of the card, carrying it with a card holder, The edge of the tape may be damaged or lost due to repeated use by the reader / writer, resulting in an unusable card.

By the way, the condition of the card surface specified in JIS X 6301 4.2.6 is as follows: "A normal writing of information on the magnetic stripe or recording on the magnetic stripe was performed in a 6.35 mm area from each of the magnetic stripes. Do not provide any surface discontinuities that could impair normal reading of information, and for Type 2, 24 mm from the bottom edge of the card
Do not provide a sharp part of 0.05mm or more in the above range.・ ・
·"a.

However, a disadvantage of the physical properties of the vinyl chloride resin is low heat resistance. In general, vinyl chloride resin is softened and deformed at about 60 ° C., and thus is not suitable for applications in a high temperature range, for example, for home appliances and vehicles. Recently, magnetic recording media are not limited to the fields of cash cards, credit cards, ID cards, etc., but also IC cards with a magnetic stripe embedded with a contact type IC chip, non-contact IC cards with a magnetic stripe incorporating an antenna and an IC module, Or there are various cards such as cards with all of them, and applications include electronic wallets, commuter passes, telephone cards, licenses, on-board cards, etc. The materials used for these cards are more flexible than conventional cards , Storage strength, heat resistance,
High reliability including resistance such as chemical resistance is required.

[0007] Polyvinyl chloride resin is excellent in physical properties, processability, and economical efficiency. However, when it is discarded after use, it generates hydrogen chloride gas, particularly at the time of incineration, thereby damaging the furnace and shortening its life. Although the nature is not clear, the issue of PVC removal has become active in Germany, Northern Europe, and other countries due to this problem, and it is in the flow of construction materials and industrial materials in Japan.

Therefore, there is a possibility of using other resins, and there is a thermoplastic resin containing no halogen such as a polyethylene resin, a polypropylene resin, a polyester resin, a polycarbonate resin, and a polyacryl resin. However, the physical properties are quite different from those of the vinyl chloride resin, so a device is required.

On the other hand, polyethylene terephthalate, which is a kind of polyester resin, can be obtained by polycondensing terephthalic acid and ethylene glycol. By adding a nucleating agent, a sheet having high crystallinity and high strength can be obtained. However, in an unstretched state or in a system using terephthalic acid and isophthalic acid, a low-crystallinity sheet having low crystallinity can be formed. It is a crystalline sheet.

Although the properties of these low-crystalline polyethylene terephthalate resin sheets and the suitability for embedding a magnetic tape are similar to those of a vinyl chloride resin, when these sheets are used alone, the curl after embossing is processed. Became very large and was considered difficult as a substitute.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the problem to be solved by the present invention is to improve the heat resistance and the processing aptitude close to that of vinyl chloride resin. An object of the present invention is to provide a laminate for a card base material which has curl after embossing and does not generate chlorine gas at the time of waste incineration, and a card using the laminate for a card base material.

[0012]

Means for Solving the Problems According to the first aspect of the present invention, there is provided a laminate for a card base mainly comprising two or more layers of a heat-resistant polyester resin. The lamination for a card substrate, wherein the resin composition of the sheet and the back layer sheet is the same, but a sheet in which a lubricant such as methyl stearate, a filler such as calcium carbonate, and a filler are mixed is laminated on the back layer sheet. Body.

By mixing a lubricant such as methyl stearate, a filler such as calcium carbonate, or a filler, physical properties such as elongation can be changed, and the workability of embossing is improved.

The invention according to claim 2 is characterized in that the front layer sheet and the back layer sheet laminated on the crystallized polyester resin sheet are thermoplastic resin sheets having a crystallinity of 5% or less. The laminate for a card substrate according to claim 1, wherein

As the degree of crystallinity increases, the fluidity at a temperature higher than the softening temperature decreases and the moldability deteriorates. Therefore, the degree of crystallinity is preferably 5% or less.

The third aspect of the present invention is the laminate for a card substrate according to the second aspect, wherein the thermoplastic resin sheet has a softening temperature of 70 ° C. or higher.

In summer, the temperature inside the car is around 60 ° C., and it is necessary to use a resin having a softening temperature of 70 ° C. or higher in order to prevent distortion and curling.

Further, the invention according to claim 4 is characterized in that the thermoplastic resin sheet is made of a copolymer of terephthalic acid and cyclohexane dimethanol, a copolymer of terephthalic acid and cyclohexane dimethanol and ethylene glycol, terephthalic acid The laminate for a card substrate according to any one of claims 2 and 3, wherein the laminate is a copolymer of phthalocyanine and isophthalic acid and ethylene glycol, or an alloy of the copolymer and polycarbonate or polyarylate. Body.

Further, the invention according to claim 5 is characterized in that the thermoplastic resin sheet is made of one of ABS, AS, polystyrene, polyacrylonitrile, polymethyl acrylate, polymethyl methacrylate, polyvinyl acetate, polyvinyl alcohol, etc. 4. The laminate for a card substrate according to claim 2, which is composed of a mixture.

Further, the invention according to claim 6 is the invention according to claim 1.
A card characterized in that the card laminate according to any one of the above items (5) to (5) has a function of recording information such as a magnetic recording layer and an IC module.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The heat-resistant, thermoplastic polyester resin sheet obtained by uniaxially or biaxially stretching and orienting and crystallization used in the present invention can be obtained using aromatic dibasic acid or dibasic acid ester and glycol as starting materials. With a polymer,
Polyethylene terephthalate (PET) produced by melt polymerization of dimethyl terephthalate and ethylene glycol is mainly used. In addition, polybutylene terephthalate (PBT) obtained by polymerizing terephthalic acid and tetramethylene glycol, and 2,6- Polyethylene 2,6 comprising naphthalene dicarboxylic acid and ethylene glycol
It is not limited to this as long as it is oriented and crystallized, such as naphthalate (PEN), polybutyne 2,6-naphthalate (PBN), and polycyclohexane terephthalate (PCT) made from terephthalic acid and cyclohexane dimethanol.

Also, a polyester sheet crystallized by adding an organic or inorganic crystal nucleating agent without stretching the above polyester sheet can be used.

[0024] These crystallized sheets cannot be heat-sealed unless the temperature is raised to a temperature higher than the melting point. At such a temperature, the crystal collapses and the physical properties are extremely reduced. For example, an adhesive mainly composed of a resin such as a polyester resin, a urethane resin, an acrylic resin, a vinyl acetate resin, and an epoxy resin can be used.

A low-crystalline resin sheet layer having a crystallinity of 5% or less is laminated on both sides of the polyester resin sheet crystallized by the oriented crystallization or the crystal nucleating agent. Are copolymers of terephthalic acid with cyclohexanedimethanol and ethylene glycol, alloys of the copolymer with polycarbonate, copolymers of terephthalic acid with isophthalic acid and ethylene glycol, acrylonitrile-butadiene-styrene copolymer A simple substance such as a polymer resin, a polystyrene resin, a polyacrylonitrile resin, a polyvinyl alcohol resin, a polymethyl acrylate resin, a polymethyl methacrylate resin, a vinyl acetate resin, a polycarbonate resin, or a mixture thereof can be used.

These low-crystalline resin sheets are provided on both sides of the crystalline sheet. However, if only one side is used, the sheet cannot be used as a card due to curling due to a different heat shrinkage rate when melt-laminated. Become.

Further, if such a crystalline polyester sheet or a low crystalline polyester resin has a weight ratio of 50% or less, preferably 15% or less, various additives and substances such as polymers may be added as necessary. You may.

Then, a magnetic recording layer is laminated on one or both sides of the card base material. A conventionally used thermal transfer type magnetic tape is transferred, or the magnetic recording layer is directly applied to the card base material. A printing method is used.

As a method for producing such a card, a melt lamination method using a heating press machine can be used. In the laminating method, a transparent protective sheet is laminated on both sides of a printed base material, and at that time, the types of the protective sheets on both sides may be different. The melt lamination method is a method in which a card material is sandwiched between mirror plates that are one size larger, and then the card material is integrated by a hot melt press.

As the mirror plate used at this time, a nickel-chromium-plated copper plate, a stainless plate having a polished surface, an aluminum plate having a polished surface, or the like can be used. Also,
The printing on the base material can be performed by the same method as that of the conventional paper or plastic, that is, by printing a character or a pattern by a known printing method such as an offset printing method, a screen printing method, and a gravure printing method.

After the melt lamination, the card material is peeled off from the mirror surface plate, and punched out into a card shape by punching with a single-edged or male-female mold.

Normally, after a card is formed, a floating character is embossed by an embosser, and the character is tipped and colored with a heat transfer foil, magnetic information is encoded on a magnetic stripe, and in some cases, a face is printed. Transfer photos and barcodes to finish the card. Then, a protective layer can be provided for the purpose of improving the resistance of the character or picture printing layer to wear or the like.

Conventionally, since the polyvinyl chloride resin is used as the base material of the magnetic card, the heat resistance is low, and when a heat-resistant polyester resin sheet mixed with high heat-resistant polycarbonate or polyarylate is used alone, the card becomes After the shape was formed, the embosser embossed the floating characters and the curl grew larger. Therefore, in the present invention, when a card is made by laminating a plurality of sheets mainly using this heat-resistant polyester-based resin sheet, the resin composition is exactly the same on the front and back sheets and an additive is mixed on one side. It was experimentally found that by changing the physical properties (tensile strength, mainly elongation), curl after embossing was reduced with high heat resistance.

[0034]

Embodiments of the present invention will be described below in detail. (Example 1) As shown in the cross-sectional view of FIG. An adhesive layer (2) is provided, and a PET-G sheet (3) (manufactured by Mitsubishi Plastics, Inc.) of 0.15 mm as a surface layer sheet is provided on the PET sheet (1), and a back layer sheet is the same as the surface layer sheet. 0.15 mm thick PE obtained by mixing 3% of a lubricant (methyl stearate) as an additive with PET-G
The TG sheet (4) was laminated. A picture printing layer (5) is applied to the surface of the surface layer sheet and the back layer sheet by offset printing, screen printing, etc., and then a 0.1 mm thick PET / PC sheet (7) (FIG. (Mitsubishi Resin Co., Ltd.) were stacked, sandwiched between stainless steel plates having a smooth surface, subjected to heat bonding at 120 ° C. for 20 minutes to be cooled and solidified, and then punched into a card shape to form a card. Thereafter, the curl was measured by embossing, and the curl was smaller than that of the card of Comparative Example 1 in which no additive was added.

(Comparative Example 1) As shown in the sectional view of FIG. 1 (b), the same PET-G as the surface layer sheet, in which 3% of a lubricant (methyl stearate) was not mixed into the back layer sheet as an additive. Example 1 except for using sheet (3)
When the curd was formed and embossed in the same manner as in Example 1 and the curl was measured, the curl was larger than that of Example 1 using the additive.

(Embodiment 2) FIG. 2 shows a sectional view of this structure. On the PET-G sheet (11) (manufactured by Mitsubishi Plastics, Inc.) having a thickness of 0.6 mm, a pattern printing layer (12) on the front surface is applied by offset printing, screen printing, etc., and a pattern printing layer (12) on the back surface. Was similarly printed. Thereafter, the magnetic tape (13) was transferred to the surface layer sheet to a thickness of 0.1 m.
m PET / PC sheet (14) (Mitsubishi Plastics Corporation)
3% of a lubricant (methyl stearate) was added as an additive to the back layer sheet, and a 0.1 mm thick PET / PC sheet (15) having the same resin composition as the top layer sheet was overlaid to smooth the surface. 120 sandwiched between stainless steel plates
C. for 20 minutes, and the mixture was cooled and solidified, and then punched into a card shape to form a card. Thereafter, the curl was measured by embossing, and the curl was smaller than that of the card of Comparative Example 2 in which no additive was added.

(Comparative Example 2) As the back layer sheet, PET / 0.1 mm thick same as the front layer sheet without adding lubricant.
Except that a PC sheet was used, carding and embossing were performed in the same manner as in Example 2 above, and the curl was measured.
It was larger than the curd of Example 2 using the additive.

(Embodiment 3) FIG. 3 shows a sectional view of this structure. 0.3-mm thick PET-G sheet (manufactured by Mitsubishi Plastics, Inc.) (21) and the same resin composition as above, and 0.3-mm thick PET-G mixed with 3% of a lubricant (methyl stearate) as an additive. Sheet (22) at 110 ° C for 2
It was press-bonded and heat-fused for 0 minutes to cool and solidify. A pattern printing layer (23) was applied to the surface of this laminated sheet by offset printing, screen printing, and the like, and the pattern printing layer (23) was similarly printed on the back surface. Thereafter, a PET / PC sheet (manufactured by Mitsubishi Plastics, Inc.) (25) having a thickness of 0.1 mm to which a magnetic tape (24) has been transferred is superimposed on the front and back surfaces, and is sandwiched between stainless steel plates having smooth surfaces. After being heat-bonded for 1 minute and cooled and solidified, it was punched into a card shape to form a card. Thereafter, when the curl was measured by embossing, the curl was smaller than the card of Comparative Example 3 in which no additive was added.

(Comparative Example 3) A 0.3 mm thick PET-mixed with 3% of a lubricant (methyl stearate) as an additive.
In place of the G sheet (22), a PET-G sheet having the same thickness of 0.3 mm without the addition of a lubricant was used, and carding and embossing were performed in the same manner as in Example 3 to measure curl. And the curd of Example 3 using the additive.

(Embodiment 4) FIG. 4 shows a sectional view of this structure. A pattern printing layer (32) on the front surface is applied to a 0.6 mm thick PET / PC sheet (31) (manufactured by Mitsubishi Plastics, Inc.) by an offset printing method, screen printing, or the like. ) Was similarly printed. afterwards,
3% lubricant (methyl stearate) as an additive on the back
Thickness 0.2mm with mixed magnetic tape (33) transferred
The PET / PC sheet (34) was stacked, sandwiched between stainless steel plates having a smooth surface, heat-bonded at 120 ° C. for 20 minutes, solidified by cooling, and then punched into a card shape to form a card. Thereafter, when the curl was measured by embossing, the curl was smaller than the card of Comparative Example 4 in which no additive was added.

(Comparative Example 4) PET / 0.2 mm thick mixed with 3% of a lubricant (methyl stearate) as an additive
In place of the PC sheet (34), except that a PET / PC sheet having the same thickness of 0.2 mm without adding a lubricant was used, carding and embossing were performed in the same manner as in Example 4 above, and the curl was measured. The curd was larger than the curd of Example 4 using the additive.

(Comparative Example 5) FIG. 5 shows a sectional view of this structure. PET-G sheet (11), PE in Example 2
Instead of T / PC sheets (14, 15) (manufactured by Mitsubishi Plastics, Inc.), PVC sheets of similar thickness (Mitsubishi Plastics, Inc.)
Ex.) (41, 44, 45) was used, and the curl was measured and embossed in the same manner as in Example 1. The curl was measured to be about 1.4 mm (including the card thickness).

As can be seen from the above Examples 1, 2, 3, and 4, the curls of Comparative Examples 1, 2, 3, and 4 in which no lubricant was added were larger than those of Examples in which the lubricant was added. It turned out that. That is, by adding the lubricant, the curl of the card after embossing was very small. Further, the cards shown in Examples 1, 2, 3, and 4 have practically no problem in required light resistance, chemical resistance, heat resistance, and the like, and are satisfactory as in-vehicle cards. Was.

Although the curl of the card of Comparative Example 5 after embossing was reduced to the same degree as that of the example, since the core was made of PVC and did not have heat resistance, it was used in a room where the temperature was high, etc. When used, there is a problem that the deformation is remarkably unusable. Furthermore, when incinerated at the time of disposal after use, there is a problem in that since the vinyl chloride resin is used, hydrogen chloride gas is generated and the furnace is damaged, resulting in poor disposability.

On the other hand, in the magnetic cards of Examples 1, 2, 3, and 4, the curl after the embossing process is small and the heat resistant resin is used for the card base material.
It has high heat resistance, does not deform even if placed in a car in the middle of summer, and because it does not use vinyl chloride resin, it can be said that it is an extremely discardable card even if it is burned after use Can be.

[0046]

As described above, in the magnetic card of the present invention, there has been a problem that the card base using the polyester resin sheet alone as the base has a large curl after embossing. In the laminate for a card substrate of the present invention, by using the same resin composition of the front layer sheet and the back layer sheet, by using a sheet having an increased elongation by mixing a lubricant or the like only to the back layer sheet. After the lamination, curling does not occur, and curling after embossing can be reduced. Further, it is possible to provide a card which has high heat resistance, has no problem of hydrogen chloride or dioxin when incinerated after use, and is considered for disposal. Further, by using a polyester resin sheet mixed with heat-resistant polycarbonate or polyarylate as an amorphous polyethylene terephthalate-based resin substrate, a card having high heat resistance can be provided.

[Brief description of the drawings]

FIG. 1 shows the configuration of cards of Example 1 and Comparative Example 1,
1A is a configuration sectional view of Example 1 and FIG. 2B is a configuration sectional view of Comparative Example 1.

FIG. 2 is a cross-sectional view illustrating a configuration of a card according to a second embodiment.

FIG. 3 is a configuration sectional view of a card according to a third embodiment.

FIG. 4 is a sectional view illustrating a configuration of a card according to a fourth embodiment.

FIG. 5 is a configuration sectional view of a card of Comparative Example 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Oriented crystallized PET 2 ... Adhesive layer 3 ... PET-G sheet 4 ... PET-G sheet to which lubricant was added 5 ... Printing layer 6 ... Magnetic tape 7 ... PET / PC sheet 11 ... PET-G sheet 12 ... Printed layer 13 ... Magnetic tape 14 ... PET / PC sheet 15 ... PET / PC sheet added with lubricant 21 ... PET-G sheet 22 ... PET-G sheet added with lubricant 23 ... Printed layer 24 ... Magnetic tape 25 ... PET / PC sheet 31 ... PET / PC sheet 32 ... Printed layer 33 ... Magnetic tape 34 ... PET / PC sheet with lubricant added 41 ... PVC sheet 44 ... PVC sheet 45 ... PVC sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 5/738 G11B 5/80 5/80 G06K 19/00 K F term (Reference) 2C005 HA10 HB01 HB04 HB09 JA02 KA03 4F100 AH02B AK12A AK12B AK21A AK21B AK22A AK22B AK25A AK25B AK27A AK27B AK41A AK41B AK41C AK43A AK43B AK45A AK45B AK74A AK74B AL01A AL01B AL05A AL05B BA03 BA07 BA10A BA10B CA19B CA23B CB00 EC03 EC18 GB71 JA04A JA04B JA11A JA11B JJ03A JJ03B JL00 YY00A YY00B 5B035 AA07 BA03 BA05 BB02 BB09 CA01 5D006 CA01 CB01 CB05 CB06 CB08 CC01 CC04 DA01 FA04

Claims (6)

[Claims] 1. A laminate for a card base material comprising two or more layers of a heat-resistant polyester resin as a main component, wherein the top layer sheet and the back layer sheet have the same resin composition, but the back layer sheet has methyl stearate or the like. A laminate for a card substrate, wherein sheets obtained by mixing a lubricant, a filler such as calcium carbonate, and a filler are laminated. 2. A sheet according to claim 1, wherein the surface layer sheet and the back layer sheet laminated on the crystallized polyester resin sheet are thermoplastic resin sheets having a crystallinity of 5% or less.
The laminate for a card substrate according to the above. 3. The thermoplastic resin sheet having a softening temperature of 7
The laminate for a card substrate according to claim 2, wherein the laminate is at 0C or higher. 4. A thermoplastic resin sheet comprising a copolymer of terephthalic acid and cyclohexanedimethanol, a copolymer of terephthalic acid and cyclohexanedimethanol and ethylene glycol, and a copolymer of terephthalic acid and isophthalic acid and ethylene glycol. The laminate for a card substrate according to any one of claims 2 and 3, wherein the laminate is a polymer or an alloy of a copolymer thereof and a polycarbonate or polyarylate. 5. The method according to claim 1, wherein the thermoplastic resin sheet is made of ABS, AS,
4. The laminate for a card substrate according to claim 2, wherein the laminate comprises a simple substance or a mixture of polystyrene, polyacrylonitrile, polymethyl acrylate, polymethyl methacrylate, polyvinyl acetate, polyvinyl alcohol, and the like. 6. A card, wherein the card laminate according to claim 1 has a function of recording information such as a magnetic recording layer and an IC module.