JPH11110747A - Base material for magnetic recording card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a trouble due to the warp of a card, to eliminate irregularities on the surface of the card by means of a magneto sensitive fiber arranged in a state where it cannot be reproduced inside, to securely read peculiar information by a magnetic head and to disable the providing position and the providing pattern of magnetosensitive fiber from outside as the authenticity discrimination means of the magnetic recording card. SOLUTION: The base material is a composite sheet formed by stacking a sheet body constituted of magnetosensitive fiber between inter-film layers which are mainly composed of the polyester resin of the two layers of the same type or different types by polymer adhesive or cross linking agent. The warps in a long side direction and a short side direction when a card size is set to be that decided to JISX 6311 are made to be not more than 0.5 mm. The average of the length direction and the difference of thermal shrinkage rates in both width ends at the time of processing both film layers which are mainly constituted of polyester resin at 150 deg.C for thirty minutes are made to be not more than 0.5%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite substrate for a magnetic recording card, for example, a telephone card, a railway card,
As with prepaid cards such as pachinko cards, various cards including ID cards, etc., it is possible to determine the authenticity of magnetic recording cards that require authenticity very reliably, and to make it impossible to forge or falsify. The present invention relates to a composite base material suitable for a magnetic recording card manufactured in accordance with the present invention.

[0002]

2. Description of the Related Art In recent years, card systems such as various prepaid cards and ID cards utilizing a magnetic recording system include telephone cards, transportation cards such as railways / buses and highways, various leisure cards represented by pachinko machines,
It has become established and used in social life in many fields, such as point cards, membership cards and distribution / financial cards.
However, as the field of use has expanded, the technology for reading and reworking recorded information has also been advanced, and damages such as forgery and falsification have increased in various fields, and this has become a major social problem that can no longer be neglected.

On the other hand, in view of the current situation, many techniques have been developed and proposed for methods of preventing forgery and falsification. For example, for a magnetic recording card, a method for preventing reading of recorded data by using a magnetic shield or the like. At the same time, forgery and falsification techniques are becoming more sophisticated and sophisticated, and the fact is that conventional security measures alone are no longer sufficient. Under such circumstances, some new ideas have been proposed to more reliably determine the authenticity of the magnetic recording card. For example, Japanese Patent Application Laid-Open No. Hei 6-227187 proposes a magnetic recording card or the like using a non-woven magnetic sensitive fiber as an authenticity discriminating layer. This disclosure technology incorporates a nonwoven fabric-shaped magnetic sensitive fiber as an authenticity discriminating unit for discriminating whether or not the card is genuine, in addition to the original recording data in the magnetic recording card. The magnetic fiber layer is used as a memory for authenticity discrimination, preventing card forgery in advance. Magnetic fibers are intricately entangled in random directions and have unique information due to chance, making it almost impossible to reproduce. It is considered that forgery of the card becomes extremely difficult because the information recording unit can be used as the information recording unit.

[0004] As described above, the authenticity discrimination means using magnetically sensible fibers is considered to be a very effective means. However, as far as the present applicant knows, those which have been put to practical use in actual magnetic recording cards are commercially available. Has not been done. The biggest reason is that
By sandwiching the non-magnetic fiber non-woven fabric between card bases usually made of plastic sheets, the fiber position is likely to appear as irregularities on the card surface, which is one of the causes of recording and reading errors by the magnetic head, In addition, the arrangement position appears on the card surface, and the arrangement position of the magnetically sensitive fiber is easily detected from the outside, etc., and a single-layer plastic sheet or film used as a normal magnetic recording card base material is used. By combining two layers of film, warpage is likely to occur when a card is used, and feed errors and
It is considered that there is a situation where a trouble such as a reading error is likely to occur. Therefore, in order to more effectively take advantage of the use of the magnetic sensitive fiber, the unevenness level caused by the arrangement of the magnetic sensitive fiber can be reliably recorded and read by the magnetic head, and the arrangement position and the magnetic sensitive fiber can be used. In addition, it is necessary to make the random arrangement pattern invisible from the outside and to reduce the occurrence of warpage in the composite process.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above situation, and its object is to
Further improve the technology of using magnetic fibers as authenticity discriminating means, especially the magnetic fibers are intricately intertwined in random directions and have unique information by chance, and the magnetic fibers are arranged almost irreproducibly. Eliminates reading errors due to unevenness caused by the arrangement, makes it impossible to detect the arrangement position and the random arrangement pattern of magnetic sensitive fibers from the outside, and reduces warpage when it is used as a card, ensuring forgery and falsification The purpose of the present invention is to establish a technology that can be prevented from being used as a card and has excellent practicality as a card.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies, and as a result, as a base material for a magnetic recording card, a two-layer polyester having characteristics such as specific opacity and apparent specific gravity. By using a composite sheet obtained by arranging a sheet containing a specific magnetic sensitive fiber between the base resin film layers, irregularities on the card surface are eliminated, reading by a magnetic head is ensured, and the arrangement of the magnetic sensitive fiber is performed. Have found that it is possible to prevent the pattern from being detected from the surface side of the polyester resin layer and can surely prevent forgery and falsification, and have already made some proposals. By setting the heat shrinkage of the polyester resin film used in the above process in a specific range, it is possible to obtain a particularly excellent card base material. In which it has been found.

That is, the present invention relates to (1) a method of forming a sheet adhesive composed of magnetically sensible fibers, part or all of which is a polymer adhesive, between film layers mainly composed of the same or different two layers of polyester resin. And, if necessary, a composite sheet laminated with a crosslinking agent.
Wherein the warpage in both the long side direction and the short side direction when the card size is determined to be 0.5 mm or less, wherein the main component is (2) a polyester resin used. Film layer to be 150
The composite base material for a magnetic recording card according to the above (1), wherein the difference ΔSH1 at both ends of the heat shrinkage in the longitudinal direction at 30 ° C. for 30 minutes is 0.5% or less, (3) two layers (1) or (1) wherein the difference ΔSH2 in the average heat shrinkage in the longitudinal direction between the film layers A and B containing the polyester resin as a main component at 150 ° C. for 30 minutes is 0.5% or less. (4) 150 of each of the two polyester film layers A and B;
The composite for a magnetic recording card according to any one of the above (1) to (3), wherein the difference ΔSH3 and ΔSH4 at both ends of the heat shrinkage in the longitudinal direction at 30 ° C. for 30 minutes is 0.5% or less, respectively. Substrate, where ΔSH1 = | SHL-SHR | SHL: Longitudinal thermal shrinkage (%) of the left end in the entire width of the film SHR: Longitudinal thermal shrinkage (%) of the right end in the entire width of the film ΔSH2 = | SHA− SHB | SHA: Average heat shrinkage in the length direction of film layer A (%) SHB: Average heat shrinkage in the length direction of film layer B (%) ΔSH3 = | SHLA−SHLB | ΔSH4 = | SHRA− SHLB | SHLA: Heat shrinkage in the length direction of the left end in the entire width of film layer A (%) SHLB: Heat shrinkage in the length direction of the left end in the entire width of film layer B (%) SHRA: Total width of film layer A Oak Heat shrinkage rate in the right end length direction (%) SHRB: Heat shrinkage rate in the right end length direction in the entire width of the film layer B (%) (5) At least one layer of the film layer mainly containing a polyester resin is used. A polyester film having an optical density of not less than 0.3 and an apparent specific gravity of 1.0 to 1.3, and comprising at least a uniaxially stretched polyester-containing film therein. 1)-(4)
And (6) at least one of a film layer mainly composed of a polyester resin.
The above-mentioned (1) to (5), wherein the layer comprises a polyester film having an easily adhesive coating layer on at least one surface.
The composite substrate for a magnetic recording card according to any one of (1) to (7), wherein the easily adhesive coating layer comprises a polyester resin, a polyurethane resin,
The composite substrate for a magnetic recording card according to the above (6), comprising a composition comprising one or two or more selected from acrylic resins alone or as a mixture or copolymer; The composite substrate for a magnetic recording card according to the above (6) to (7), wherein the layer is formed at a stage before the stretching step of the film containing the polyester resin as a main component is completed. The composite substrate for a magnetic recording card according to any one of the above (6) to (8), wherein the easy-adhesive coating layer contains an antistatic agent.

[0008] The polyester resin in the film layer of the present invention includes aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid or esters thereof with ethylene glycol, diethylene glycol,
It is mainly composed of a polyester obtained by polycondensing glycols such as 1,4-butanediol, 1,6-hexamethylene glycol and neopentyl glycol. Of course, it is needless to say that copolymerizable aromatic, aliphatic and alicyclic dicarboxylic acids and aromatic, aliphatic and alicyclic glycols may be contained as components of the polyester resin. These polyesters react aromatic dicarboxylic acids and glycols directly,
In addition to polycondensation, it is produced by a method such as transesterification between an alkyl ester of aromatic dicarboxylic acid and glycol followed by polycondensation, or polycondensation of diglycol ester of aromatic dicarboxylic acid.
Representative examples of such polyesters include polyethylene terephthalate, polybutylene terephthalate and polyethylene 2,6-naphthalate. This polyester may be a homopolymer or a copolymer of the third component. In any case, in the present invention, a polyester having ethylene terephthalate, butylene terephthalate, and ethylene 2,6-naphthalate units of 70 mol% or more, preferably 80 mol% or more, more preferably 90 mol% or more is preferable.

When the composite substrate for a magnetic recording card of the present invention is obtained from a film using the above polyester resin,
It is particularly preferable that the polyester resin layer is biaxially stretched and oriented in terms of practicality such as card strength and waist. Further, in the film layer containing the polyester resin of the present invention as a main component, the difference ΔSH1 at both ends of the heat shrinkage in the longitudinal direction at the time of treatment at 150 ° C. for 30 minutes may be 0.5% or less. It is necessary, and furthermore, the case where ΔSH1 is 0.3% or less is preferable, and the case where it is less than 0.2% is particularly preferable. When ΔSH1 exceeds 0.5%, when the obtained composite sheet is used as a magnetic recording card, a warpage exceeding 0.5 mm having irregular distortion called a propeller curl easily occurs, which is not preferable. . Further, the difference ΔSH2 in the average heat shrinkage in the longitudinal direction between each of the two polyester film layers A and B mainly containing the polyester resin of the present invention at 150 ° C. for 30 minutes is 0.5.
% Or less, and particularly preferably 0.2% or less. When ΔSH2 is more than 0.5%, when the obtained composite sheet is used as a magnetic recording card, the warp in the longitudinal direction of the card tends to be large, and a feed mistake or clogging occurs when the card is used. Error is likely to occur, which is not preferable. In addition, the difference in heat shrinkage in the longitudinal direction between the two polyester film layers A and B at 150 ° C. for 30 minutes at both width ends ΔSH
3 and ΔSH4 are each desirably 0.5% or less, and particularly preferably 0.2% or less. △
When SH3 and ΔSH4 exceed 0.5%,
When a magnetic recording card is formed by using the obtained composite sheet, a warp called a propeller curl easily occurs together with a warp in the longitudinal direction of the card. Further, the film layer containing the polyester resin of the present invention as a main component is preferably partially or entirely opaque. The opaque polyester resin layer is not particularly limited,
Usually, it can be obtained by adding inorganic particles or a resin incompatible with plastic. The opacity is desirably 0.3 or more, and particularly preferably 0.5 or more. When the optical density is less than 0.3, the arrangement position of the magnetically sensitive fiber is easily detected optically when a card is used, and the printing effect is unclear when a table is printed, which is not preferable.

The method for obtaining such an optical density is not particularly limited, but it can usually be obtained by adding a resin incompatible with inorganic particles or polyester. The amount to be added is not particularly limited, but is 5 to 35% by weight, preferably 8 to 25% by weight in the case of inorganic particles. On the other hand, when an incompatible resin is added, it is 5 to 35% by volume, preferably 8 to 2% by volume.
8% by volume. The inorganic particles used are not particularly limited, but have an average particle size of 0.1 to 4 μm, preferably 0.3 to 1.
Inorganic particles of 5 μm can be mentioned. In particular,
Titanium oxide, barium sulfate, calcium carbonate, calcium sulfate, silica, alumina, talc, kaolin, clay and the like, or a mixture thereof; and other common inorganic particles such as calcium phosphate, mica, hectorite,
You may use together with zirconia, tungsten oxide, lithium fluoride, calcium fluoride, etc. The resin incompatible with the polyester is not particularly limited. For example, in the case of mixing with polyethylene terephthalate, acrylic resin, polyethylene, polypropylene, polymethylpentene, modified olefin resin, polystyrene, polybutylene terephthalate-based resin Resins, phenoxy resins, polyphenylene oxides, polycarbonates, and the like can be given, and of course, they can be used in combination with the above-mentioned inorganic particles. Needless to say, various whitening agents may be added as necessary.

Further, at least one of the film layers of the composite sheet of the present invention containing a polyester resin as a main component is made of a thermoplastic resin containing fine cavities having an apparent specific gravity of 1.0 to 1.3. Is desirable. When the polyester resin film layer has fine cavities, the flexibility of the resin film layer is improved, and irregularities which are likely to be generated due to the arrangement of the magnetic sensitive fibers are absorbed and hardly appear on the surface. Further, the opacity is further improved by causing light scattering at the interface with the matrix due to the contained fine cavities, and the addition of the inorganic particles can be reduced, which is particularly useful. Further, the inclusion of the fine cavities can reduce the weight of the resin layer itself, so that it is easy to handle and has a great economic effect such as a reduction in raw material costs and transportation costs.

As a method for obtaining such a thermoplastic polyester resin film layer containing fine cavities, a sheet obtained by adding the above-described incompatible resin to the thermoplastic polyester resin matrix, kneading the mixture, and dispersing the resulting mixture into fine particles. Is stretched in at least one axis direction, and a known method that has been disclosed, such as a method of generating a cavity around the incompatible resin fine particles, can be used.

Further, it is preferable that at least one surface of the film layer containing the polyester resin of the present invention as a main component is subjected to an easy adhesion treatment. Examples of the method of the easy adhesion treatment include a method by irradiation with active energy rays such as a corona discharge treatment, a plasma discharge treatment, an ultraviolet (UV) irradiation treatment and a radiation (EB) irradiation treatment, a flame treatment, and a vapor deposit such as PVD and CVD. And a method of applying a composition mainly composed of an easily adhesive resin or the like to the surface of the polyester resin film layer. Among them, a sheet body and a polymer made of magnetic fibers in the constitution of the present invention are included. The most effective method is to provide a coating layer on the surface from the viewpoint of the adhesiveness with the adhesive layer and the adhesiveness with the magnetic recording medium layer, the printing ink layer, and other coating agents as a card base material. One. As a composition constituting such a coating layer, a composition mainly composed of a polyester resin is preferably used. In addition, a polyurethane resin, an acrylic resin, and a mixture or copolymer thereof are also used. Applicable.

Further, among these resin compositions, when a water-insoluble aqueous polyester resin containing a sulfone group in the molecule and an aqueous polyurethane resin are mixed and used, the binder for the magnetic recording medium is cellulose-based.
PVC and PVC-based cases and printing inks are UV
Particularly favorable results can be obtained when sufficient adhesion to the polyester film surface is usually difficult to obtain, such as in the case of a curable ink. In this case, the weight ratio of the aqueous polyester resin and the aqueous polyurethane resin is preferably 9/1 to 1/9.

[0015] In the case where the coating layer composition further contains an antistatic agent, various processes for carding the obtained composite substrate for a card, for example, coating of a magnetic recording medium layer may be performed. This is particularly preferable because the occurrence of static electricity troubles in printing, cutting, punching and the like can be prevented. As the antistatic agent, those generally used as a coating type antistatic agent can be arbitrarily used.

Means for providing the coating layer include roll coating such as gravure coating, reverse coating, and kiss coating, bar coating, air knife, blade coating, comma coating, curtain coating, spraying, and dip coating. A commonly used method such as a method can be applied. As a step of applying, a method of applying in advance to the surface of the polyester resin composition film layer before performing the stretching orientation treatment, applying the resin composition film surface oriented in one axis direction, and further orienting it in the perpendicular direction. Any method such as a method of applying to the surface of the resin composition film which has been subjected to the biaxial orientation treatment is possible, but in particular, it is applied to the surface of the uniaxially oriented film, and then stretched and oriented in the perpendicular direction to crystallize. Is the most preferable method in terms of the adhesive effect, economy, cleanliness and the like. 0.03 ~
It is preferred that it be in the range of 3μ.

The magnetic recording card base material of the present invention needs to have a sheet made of a magnetic sensitive fiber, at least one part of which is between two film layers made of polyester resin. Magnetic-sensitive fibers are disclosed, for example, in JP-A-7-17-1.
97311 can be obtained by a known method such as a method of uniformly dispersing fine magnetic particles in a fiber-forming organic polymer and spinning. In the present invention, a sheet made of such a magnetic sensitive fiber is used. The sheet is obtained by using a non-woven fabric, a woven fabric or a knitted fabric, which is used alone or in combination with another synthetic or natural polymer fiber. As a method of compounding with another fiber, for example, a method such as blending, twisting, blending, weaving, weaving and the like can be used. Above all, from the viewpoint of the randomness of the arrangement of the magnetic sensitive fiber, strength, handleability, etc.
A non-woven sheet obtained by mixing and heating the magnetic fiber and other heat-fusible polymer fibers can be most preferably used. Among such magnetic fibers, for the purpose of the present invention, the fiber diameter is 5 μm or more and 60 μm or less, more preferably 5 μm or less.
It is desirable that it is not less than m and not more than 40 μm. If the fiber diameter is less than 5 μm, the strength of the single fiber becomes insufficient, and it becomes difficult to maintain a stable sheet state. In addition, 60μ
When it exceeds m, the unevenness on the surface of the composite base material layer becomes conspicuous, which is not preferable.

The required amount of the magnetically sensitive fiber in the sheet is 1 to 40 g per m ^{2 of the} sheet, and more preferably 3 to 40 g.
３０30 g. If the amount is less than 1 g, the effect of recording the true / false information by the magnetically sensitive fiber becomes insufficient, and the effect of the present invention cannot be obtained. On the other hand, if it exceeds 40 g, it is not preferable because it is easy to sense from the surface of the composite base material and the randomness of the magnetic sensitive fiber is easily lost.
The sheet has an apparent thickness of 10 μm or more and 150 μm or more.
less than μm, preferably 10 μm or more, less than 100 μm,
It is particularly preferable that the thickness be 20 μm or more and less than 100 μm. If the sheet thickness is less than 10 μm, the strength as a sheet body is not sufficient and handling is difficult, and the density of the magnetically sensitive fibers tends to be insufficient. Also,
When the thickness of the sheet body is 150 μm or more, the total thickness of the composite base material sheet becomes too large, and at the same time, the arrangement position of the magnetic sensitive fiber from the surface layer of the base material sheet becomes easy to be detected. It is not preferable because adverse results such as an excessively high density are likely to occur.

In the present invention, a sheet made of the above-described magnetically sensible fiber is laminated using a polymer adhesive in order to join the two polyester resin film layers. The term “polymer adhesive” as used herein means, for example, a two-dimensional or two-dimensional long-chain high-molecular-weight polymer obtained by polymerization, polycondensation, or the like in advance. Alternatively, the adhesive may be a two-dimensional or three-dimensional polymer compound depending on the reaction temperature and time in the bonding step. Basically, these polymer adhesives can be arbitrarily selected as long as they can bond the polyester resin film layer and the sheet containing the magnetic sensitive fiber. Is preferable because it is easy to obtain excellent interlayer adhesive strength and strength when the adhesive is made of a polyester-based or polyester-urethane-based resin containing as one component. Examples of such polyester-based or polyester urethane-based adhesives include terephthalic acid, isophthalic acid, aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, succinic acid,
Aliphatic dicarboxylic acids such as adipic acid, sebacic acid, and azelaic acid; unsaturated aliphatic dicarboxylic acids such as fumaric acid, maleic acid, and itaconic acid; alicyclic dicarboxylic acids such as tetrahydrophthalic acid, hexahydrophthalic acid, and cyclohexanedicarboxylic acid Dibasic acids such as acids and polybasic acids such as tri- and tetrabasic acids such as trimellitic acid, trimesic acid and pyromellitic acid, and ethylene glycol, propylene glycol, propanediol, butanediol, pentanediol, hexanediol and neopentyl glycol , Diethylene glycol, dipropylene glycol, trimethylpentanediol, cyclohexane dimethanol, ethylene oxide adduct of bisphenol A, propylene oxide adduct of bisphenol A, hydrogenation Ethylene oxide adducts of the scan phenol A, propylene oxide adduct of hydrogenated bisphenol A, aliphatic and cycloaliphatic diols and polyethylene glycols such as polypropylene glycol,
Polytetramethylene glycol and other high molecular weight diols, and further, trimethylolethane, trimethylolpropane, glycerin, polyhydric alcohols such as tetraol such as pentaerythritol or other relatively high molecular weight diols such as ε- Homogenized or copolymerized polyester resins obtained by polycondensation with lactone-based polyester diols obtained by ring-opening polymerization of lactones such as caprolactone, and polyester-type polyols, polyethylene glycols, polypropylene glycols, Polyalkyl ethers such as polyalkylene glycols such as methylene glycol and polyhexamethylene glycol, and polyaryl ethers such as polyphenylene oxide. It includes polyurethane resins obtained by reacting ether type polyol component and polyisocyanate. Examples of the polyisocyanates include tolylene diisocyanate, xylylene diisocyanate, phenylene diisocyanate, biphenyl methane diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, dimethoxy biphenylene diisocyanate, naphthalene diisocyanate, dimethyl biphenylene diisocyanate, diphenylene diisocyanate, diisocyanate diphenyl ether, xylylene diisocyanate. Isocyanate, diisocyanate methylcyclohexane, diisocyanate dicyclohexane, diisocyanate cyclohexylmethane,
Examples include diisocyanate compounds such as isophorone diisocyanate. Among them, those obtained by further extending the chain of the obtained urethane prepolymer with diols or diamines can be used more effectively. Among the above-mentioned diols, butanediol, hexanediol and the like are effective as diols as a chain extender, and ethylenediamine, hexamethylenediamine and the like are effective as diamines and can be typically used.

[0020] Of these, the polyurethane adhesive must contain a polyester polyol component as a polyol component. When the polyol component is a polyurethane formed from only a polyether polyol, the physical properties and heat resistance of the interlayer adhesive of the present invention are insufficient, which is not preferable. Of course, it does not matter at all that the above-mentioned polyether polyol is contained as a copolymer component of the polyester urethane containing the polyester polyol. Further, these polymer adhesive components preferably have a glass transition temperature in the range of -20 ° C to 80 ° C, particularly preferably -10 ° C to 60 ° C. When the glass transition temperature is lower than -20 ° C, the physical properties and heat resistance of the interlayer adhesive become insufficient. When the glass transition temperature is higher than 80 ° C, the adhesive layer becomes brittle, and it is difficult to obtain interlayer adhesive strength.

In the polymer adhesive layer of the present invention, it is desirable to use a crosslinking agent in addition to the above-mentioned adhesive. The crosslinking agent to be used in combination is selected from a polyfunctional isocyanate compound having a blocked or free isocyanate group, a polyfunctional epoxy compound having an epoxy or glycidyl group, and a polyfunctional melamine compound having a functional alkylol group. It is desirable to use one or more of these. Among them, as a combination with the aforementioned polyester resin or polyester urethane resin adhesive,
It is preferable that the compound is a polyfunctional isocyanate compound. In particular, a trifunctional or higher functional isocyanate can be preferably used.
Examples of such a polyfunctional isocyanate compound include an adduct obtained by adding a diisocyanate monomer to a polyhydric alcohol such as methylbenzol triisocyanate, biphenyl triisocyanate, diphenylmethane triisocyanate, triphenylmethane triisocyanate, glycerin and trimethylolpropane. And the like. The compounding amount of these polyfunctional compounds depends on the nucleophilic group of the polyester resin or the polyester urethane resin, for example, -OH, -N
It is preferable to determine the amount of addition in consideration of the equivalence relationship with H, -COOH, and usually the weight ratio is 70 / 30-99.
9 / 0.1 is preferred, and 80/20 to 99.5 / 0.5
Is particularly preferably used.

As an example of a preferred embodiment for suitably obtaining a composite sheet preferable as a base material for a magnetic recording card as described above, the thicknesses T ₁ and T _{2 of two} polyester resin film layers (where T ₁ ≦ The relationship between T ₂ ) and the thickness T ₃ of the intermediate layer made of the sheet containing magnetic sensitive fibers and, if necessary, the polymer adhesive composition containing a crosslinking agent is 0.1 T ₁ <T ₃ < The polymer adhesive composition is desirably in the range of 1.5T ₂ , and the form of the supplied polymer adhesive composition is desirably an organic solvent-based or aqueous solution or dispersion. Further, as a laminating method for laminating these sheet bodies, the voids of a sheet body containing a large amount of voids, such as nonwoven fabrics, containing magnetically sensible fibers are sufficiently filled to ensure good interlayer adhesion. In order to prevent irregularities due to the fibrous magnetic material from appearing on the surface layer of the composite base material sheet, a solution of the polymer adhesive composition to be supplied in the intermediate layer of the composite base material sheet or The thickness of the dispersion is from 0.6 times to 5.0 times the apparent thickness of the sheet containing the magnetic sensitive fiber.
The most preferable result can be obtained in the case where the adhesive is supplied after drying so as to double the size, followed by drying and pressurizing. In this case, it is more preferable that the polymer adhesive composition is a solution of an organic solvent from the viewpoint of drying property, productivity and the like. Further, as a method of supplying the polymer adhesive composition solution between the sheet containing the magnetic sensitive fiber and the polyester resin film, one of the two polyester resin film layers to be the outer layer is used. After the magnetic fiber-containing sheet is superimposed on the surface of the layer on which the easy adhesion treatment has been performed, and the polymer adhesive composition solution is supplied by a die coating method from the surface of the sheet, the superposed sheets are immediately paired. The method of conducting the measurement of the application supply amount by guiding between the rolls is stable coating on the nonwoven fabric-like magnetic fiber-containing sheet whose thickness is small and the practical strength is not sufficient, and sufficient penetration into the inter-fiber voids,
This is the most preferable method from various viewpoints, such as formation of a smooth surface and securing of the adhesive area at the film / sheet interface.

After a predetermined amount of the polymer adhesive composition solution is supplied, the solvent is immediately dried, and a two-layer polyester resin film having an intermediate layer is guided between two rolls and heated. Crimped and bonded. According to the present invention, the warpage in both the long side direction and the short side direction when the card size is set is 0.5 mm or less, and the reading error due to the unevenness caused by the arrangement of the magnetic sensitive fiber is eliminated, and the arrangement position can be sensed from the outside. In order to eliminate the difference, it is important to set the difference in the heat shrinkage of each of the polyester resin films within a specific range, and also to set the conditions at the time of heat compression. That is, when bonding between two rolls, a method is adopted in which the surface temperature of each roll is in the range of 30 ° C. to 150 ° C., and the temperature difference between the front and back surfaces of the composite sheet is within 50 ° C. In this case, particularly preferable results can be obtained.
In addition, the pressure at the time of bonding depends on the linear pressure, although it depends on the temperature.
When selected from the range of 0 to 400 kg / cm, favorable results such as surface smoothness can be obtained. Further, the obtained laminated composite sheet is further subjected to a linear pressure of 50 to 500 kg / h between a pair of heating rollers in which at least one roll is a metal roller having a surface temperature of 60 ° C or more and 180 ° C or less.
When the calendering is performed under the condition of cm, a preferable range of the surface smoothness is easily obtained. As described above, the preferred embodiments of the magnetic recording card base material of the present invention have been described, but the present invention is not limited to these methods.

As described above, the composite sheet base material of the present invention eliminates irregularities on the card surface which may be caused by the arrangement of the magnetic fibers, ensures reading by the magnetic head, and reduces It is possible to prevent the arrangement pattern from being detected from the surface side of the polyester resin layer, and it is possible to reliably prevent forgery and tampering,
It is possible to provide a substrate having no warpage and extremely excellent practical characteristics when used as a magnetic recording card. A preferable magnetic recording card can be obtained by forming a magnetically recordable medium layer on the composite sheet of the present invention as a base material. The configuration of the magnetic recording card includes a configuration in which a magnetic recording medium layer is formed on one surface layer of the composite sheet base material by a coating method, and a printing layer is provided on the other surface layer, or a heat-sensitive layer is formed on the magnetic recording medium layer side. A configuration in which a recording layer, a protective layer, and the like are provided can be given. With such a configuration, the presence or absence of randomly arranged magnetically sensible fibers makes it possible to accurately determine whether the card is true or false, and it is not possible to know the position of the card from the table of the card. It cannot be forged.

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to the following Examples. In addition, various characteristics in this example were evaluated as follows.

(1) Warpage of composite substrate According to JIS X6311, a composite substrate for a magnetic recording card is cut into a card size of 85.5 mm long side and 54.5 mm short side, placed on a horizontal plate, and placed on a horizontal plate. The largest part of the distance to the upper surface of the card was defined as the warpage value.

(2) Heat Shrinkage Ratio of Polyester Resin Film According to JIS C2318, a mark is placed at a center of a test piece of about 150 mm in a film length direction of about 20 mm width at a distance of 100 mm at a distance of 100 mm. After processing for 30 minutes, the distance between gauge points was measured and calculated by the following equation. Heat shrinkage (%) = {(L ₁ −L ₂ ) / L ₁ } × 100 where L ₁ : distance between gauges before heating (mm) L ₂ : distance between gauges after heating (mm)

(3) Opacity of Polyester Resin Film Using a Macbeth densitometer TR-972, the optical density of the transmitted light under a G filter was measured.

(4) Apparent Specific Gravity of Polyester Resin Film The film is accurately cut into a square of 10 cm × 10 cm,
The thickness is measured at 50 points to determine the average thickness t (μm). Next, the weight of the sample was measured to 0.1 mg and W
(G), and the value calculated by the following equation was defined as apparent specific gravity. Apparent specific gravity = (W / t) × 100

(5) Easiness of locating the arrangement position Using a surface roughness meter Surfcom 304B (manufactured by Tokyo Seimitsu Co., Ltd.), judgment is made by measuring the surface unevenness in the W (undulation) mode and visually judging the following. Stratified by rank.

(6) Output Fluctuation A magnetic paint having the following composition was prepared and applied to the surface of the composite sheet by a gravure coating method to form a magnetic recording layer having a thickness of 10 μm. The reproduction output of the obtained magnetic recording medium was measured, and the fluctuation was judged as follows. Output fluctuation is large × Output fluctuation is slight △ Output fluctuation is small ○ (composition of magnetic paint) Co-coated γ-Fe ₂ O ₃ 75 parts PVC / vinyl acetate copolymer resin 10 parts Urethane modified polyester resin 15 parts Methyl ethyl ketone 75 parts Toluene 75 parts Isocyanate curing agent 3 parts

(7) Printability On the other side of the composite sheet having the magnetic recording layer formed thereon, an ultraviolet curable ink (Best Cure 161 manufactured by TOKA CORPORATION) is used.
Indigo and yellow) were printed and subjected to an ultraviolet irradiation treatment at an irradiation energy of 500 mJ to obtain a print sample. The obtained sample was visually judged as follows. Printed area is uneven × Printed area is slightly uneven △ Printed area is clear and easy to understand ○

(8) Interlayer Adhesion The adhesive strength of the bonding surface of the composite sheet was evaluated by practicality such as T peeling and punching with a tensile tester (manufactured by Toyo Baldwin Co., Ltd.), and the results were as follows. Was determined. (8) -1 Peeled part Peeled at the interface between the intermediate layer (magnetic fiber layer) and the film layer × Some cohesive failure of the intermediate layer (magnetic fiber layer) (coexistence of interfacial peeling) △ Cohesive failure of polyester film layer ○ ( 8) -2 Adhesive strength The card cannot be peeled off with a weak force. × The adhesive strength is insufficient and the card cannot be used practically. △ There is practically sufficient adhesive power. ○

(9) Antistatic Property After seasoning the composite sheet in an environment of 23 ° C. and 65% RH for 24 hours, a super insulation meter (R8 manufactured by Advantest Co., Ltd.) was used.
340), the surface specific electric resistance (Ω−
cm).

Example 1 Polyethylene terephthalate resin 8 having an intrinsic viscosity of 0.62
0% by weight and a melt flow index of 5.5 g / 10
The resin composition consisting of 15% by weight of polystyrene and 5% by weight of rutile-type titanium oxide is melted at 285 ° C. and extruded onto a drum having a surface temperature of 40 ° C., and the obtained unstretched sheet is subjected to 3. The film was stretched 5 times in the machine direction. In a resin composition in which a water-dispersible polyester resin and a water-dispersible polyurethane resin were blended on both sides of the obtained uniaxially stretched film such that the weight ratio of solid content was 5/5, 5 An easily adhesive aqueous coating agent containing a composition containing a cationic antistatic agent in an amount of 0.1% by weight as a main component is applied by a roll coating method so that the thickness of the solid content after stretching becomes 0.1 μm, and then dried. After stretching 3.5 times in the transverse direction at 120 ° C., heat-treat at 230 ° C. while relaxing 4%,
Two wide white polyester film rolls having a thickness of 100 μm and containing about 25% by volume of fine cavities inside and having a surface easily adhered were obtained. The obtained two film rolls were each divided by a slitter, and a 1 m-width, an apparent specific gravity of 1.1, and an opacity of 1.27 obtained from one central portion were applied to an easily-adhesive white polyester film (A). N
A nonwoven sheet having a thickness of 40 μm and an average fiber diameter of 20 μm made of an acrylonitrile copolymer containing i and an average fiber length of 4 mm and a thickness of 40 μm containing 20 g / m ² is supplied to a laminating apparatus. 100 parts by weight of a copolyester resin (glass transition temperature: 10 ° C.) containing 70 mol% of terephthalic acid as an acid component from the surface of the non-woven sheet body by a die coating method, and an addition reaction product of trimethylolpropane and toluylene diisocyanate After supplying a polymer adhesive composition solution comprising 2 parts by weight of a trifunctional isocyanate compound and 234 parts by weight of a mixed solvent of toluene and methyl ethyl ketone, the superposed sheet was immediately introduced between a pair of rolls. The supply thickness of the polymer adhesive composition solution is 120 μm
The coating supply amount was measured so that the solvent was dried immediately at 60 ° C., and the above-described thickness of 100
After another layer of an easy-adhesive white polyester film (B) having an apparent specific gravity of 1.06 and an opacity of 1.29 obtained from the center of the other film roll having a thickness of μm, another two layers having an intermediate layer were laminated. Polyester resin film
The sheet was guided between the rolls of the book, heated and pressed to perform bonding.
In this case, the dry thickness of the intermediate layer composed of the nonwoven sheet and the polymer adhesive composition was 50 μm, and the total thickness of the obtained composite sheet was 250 μm. The obtained composite sheet was guided to a calendering device having a pair of rolls capable of heating and pressing, and subjected to a treatment. The pair of rolls used was a metal / metal combination whose surfaces were chrome-plated, the roll surface temperature was both 150 ° C., and the pressure was a linear pressure of 25.
The test was performed at 0 kg / cm. The obtained composite sheet has a room temperature of 40 ° C.
The sample was left standing for 24 hours, subjected to an aging treatment, and used for evaluation. Table 1 shows the heat shrinkage characteristics in the length direction of the polyester films (A) and (B) used, Table 2 shows the opacity and apparent specific gravity characteristics, and Table 3 shows the evaluation results of the obtained composite sheet.

Example 2 The same procedure as in Example 1 was carried out except that the white polyester film (B) was a film roll having different slit positions, and was a film having an opacity of 1.30 and an apparent specific gravity of 1.04. Was obtained. Tables 1 to 3 show the films used and the evaluation results of the obtained composite sheets.

Example 3 A composite sheet having a thickness of 250 μm was obtained in exactly the same manner as in Example 1 except that the white polyester film (B) was further changed to a film having an opacity of 1.32 and an apparent specific gravity of 1.05. Obtained. Tables 1 to 3 show the films used and the evaluation results of the obtained composite sheets.

COMPARATIVE EXAMPLE 1 In producing a white polyester film (B), after stretching in the transverse direction, the heat treatment temperature was changed from 230 ° C. to 240 ° C.
And a 250 μm thick composite sheet was obtained in exactly the same manner as in Example 1, except that the slit position was changed to a film having an opacity of 1.32 and an apparent specific gravity of 1.06. Tables 1 to 3 show the films used and the evaluation results of the obtained composite sheets.

Comparative Example 2 In producing a white polyester film (B), after stretching in the transverse direction, the heat treatment temperature was changed to 215 ° C., and a film having an opacity of 1.34 and an apparent specific gravity of 1.04 at the center was obtained. Except that the thickness 2
A 50 μm composite sheet was obtained. The film used, and
Tables 1 to 3 show the evaluation results of the obtained composite sheet.

Comparative Example 3 In producing a white polyester film (B), after stretching in the transverse direction, the heat treatment temperature was changed to 215 ° C., and a film having an opacity of 1.33 and an apparent specific gravity of 1.04 at the center was obtained. Except that the thickness 2
A 50 μm composite sheet was obtained. The film used, and
Tables 1 to 3 show the evaluation results of the obtained composite sheet.

Comparative Example 4 In producing the polyester film (A), no polystyrene resin was contained, and silicon dioxide was added as inorganic particles in an amount of 0.1%.
Example 1 was repeated except that a transparent polyester film having an opacity of 0.08, an apparent specific gravity of 1.40, and a thickness of 100 μm was adjusted using a polyethylene terephthalate resin having an intrinsic viscosity of 0.62 and containing 0.05%. A composite sheet having a thickness of 250 μm was obtained in exactly the same manner. Tables 1 to 3 show the evaluation results of the used film and the obtained composite sheet.
Shown in

Comparative Example 5 Comparative Example 3 was carried out except that the easily adhesive aqueous coating agent was not applied.
A composite sheet having a thickness of 250 μm was obtained in the same manner as described above.
Tables 1 to 3 show the films used and the evaluation results of the obtained composite sheets.

Comparative Example 6 A composite sheet having a thickness of 250 μm was obtained in exactly the same manner as in Comparative Example 3, except that the easily adhesive aqueous coating agent was a type containing no cationic antistatic agent. Tables 1 to 3 show the films used and the evaluation results of the obtained composite sheets.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

From the results shown in Tables 1 to 3, the embodiment within the scope of the present invention has almost no warpage, no trouble such as a feed error or a reading error in the card use process, and a judgment of authenticity. The position of the magnetic-sensitive fiber disposed as information cannot be detected by unevenness or by visual or optical methods, and there is no fluctuation in reproduction output when a magnetic recording medium layer is formed,
It is clear that the printing effect as a card is also excellent.

[0048]

As described above, the present invention further improves the technology utilizing magnetic fibers as the authenticity discriminating means.
Eliminates troubles due to card warpage and eliminates irregularities on the card surface by magnetic fibers that are arranged in an almost unreproducible state inside, so that unique information can be reliably read by the magnetic head and magnetic fibers It is possible to provide a high-performance magnetic recording card substrate that cannot be counterfeited or tampered with, so that the arrangement position and the arrangement pattern of the fibers cannot be detected from the outside and a stable reproduction output can be obtained. It was made.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sasa Uesaka 2-1-1 Katata, Otsu-shi, Shiga Prefecture Toyobo Co., Ltd. Research Laboratory

Claims (9)

[Claims] Claims: 1. A sheet member composed of magnetically sensible fibers, part or all of which is composed of a magnetic adhesive, and if necessary, a polymer adhesive, and A magnetic sheet laminated with a cross-linking agent, wherein the warpage in both the long side direction and the short side direction is 0.5 mm or less when a card size specified in JIS X6311 is used. Composite substrate for recording cards. 2. The film layer containing the polyester resin as a main component according to claim 1 has a heat shrinkage ratio in the longitudinal direction at 150 ° C. for 30 minutes of difference ΔSH1 at both width ends of 0.5.
% Or less, a composite substrate for a magnetic recording card. However, ΔSH1 = | SHL−SHR | SHL: Heat shrinkage in the length direction at the left end in the entire width of the film (%) SHR: Heat shrinkage ratio in the right end in the entire width of the film in the length direction (%) 3. The average heat shrinkage in the longitudinal direction of each of the two film layers A and B containing the polyester resin as a main component at 150 ° C. for 30 minutes. A composite substrate for a magnetic recording card, wherein the difference ΔSH2 is 0.5% or less. However, ΔSH2 = | SHA-SHB | SHA: Average heat shrinkage in the length direction of film layer A (%) SHB: Average heat shrinkage in the length direction of film layer B (%) 4. The heat shrinkage in the longitudinal direction of each of the film layers A and B containing the two-layered polyester resin as a main component at 150 ° C. for 30 minutes. A composite substrate for a magnetic recording card, wherein the differences ΔSH3 and ΔSH4 at the width ends are each 0.5% or less. SH3 = | SHLA-SHLB | SHLA = | SHRA-SHRB | SHLA: Heat shrinkage (%) in the length direction of the left end in the entire width of the film layer A SHLB: Length direction in the left end of the entire width of the film layer B SHRA: Heat shrinkage in the length direction of the right end in the entire width of the film layer A (%) SHRB: Heat shrinkage rate in the length direction of the right end in the entire width of the film layer B (%) 5. A film layer comprising at least one of the polyester resins according to claim 1 as a main component.
The layer is composed of a polyester-based film having an optical density of 0.3 or more and an apparent specific gravity of 1.0 to 1.3 and containing at least uniaxially stretched microvoids therein. A composite substrate for a magnetic recording card, comprising: 6. A film layer comprising at least one of the polyester resins according to claim 1 as a main component.
A composite substrate for a magnetic recording card, wherein the layer comprises a polyester film having an easily adhesive coating layer on at least one surface. 7. The composite for a magnetic recording card according to claim 6, wherein the easily adhesive coating layer contains at least one selected from the group consisting of a polyester resin, a polyurethane resin and an acrylic resin. Base material. 8. The easily adhesive coating layer according to claim 6, wherein the coating layer is formed at a stage before the stretching step of the film containing the polyester resin as a main component is completed. A composite substrate for a magnetic recording card, comprising: 9. The composite substrate for a magnetic recording card according to claim 6, wherein the easily adhesive coating layer according to any one of claims 6 to 8 contains an antistatic agent.