JP4258390B2 - Information recording medium - Google Patents

Description

  The present invention is a card represented by a cash card, a credit card, an ID card (identification card), a driver's license, a member's card, a prepaid card, etc., or a tag (generally, a tag, token, or This is an information recording medium called transponder, etc.), which is particularly excellent in heat resistance, durability, embossing suitability, laser printing suitability, etc., or environmentally friendly information The present invention relates to a recording medium, and as a suitable example, a contact IC card (with a contact type communication function via an external terminal), in particular (a non-contact type communication function via an antenna or a coil provided on the card) Application to a non-contact IC card (provided with both of the contact type communication and non-contact type communication functions).

  Conventionally, information recording media such as cash cards, credit cards, ID cards and the like have been widely used. As materials thereof, polyvinyl chloride (hereinafter simply referred to as PVC) and vinyl chloride / vinyl acetate copolymers are mainly used. In particular, polyvinyl chloride is common. Polyvinyl chloride resin is widely used as a material for information recording media such as cards because it has excellent physical mechanical properties and embossability for character parts, and the cost of the material is low.

  By the way, in recent years, as the information recording medium is integrated into an IC, it is expected that the functions of the information recording medium will be enhanced. In particular, there is a need for an information recording medium that is highly durable, highly heat resistant, and environmentally friendly. However, the polyvinyl chloride resin or the vinyl chloride / vinyl acetate copolymer resin, which is a base material for conventional information recording media, has low heat resistance, and when the storage temperature exceeds 80 ° C., the recording medium may be deformed. Also, when the polyvinyl chloride resin is discarded after use, it generates hydrogen chloride gas especially during incineration, which damages the incinerator and shortens its life. Also, depending on the incineration temperature, it is said that dioxins may be generated during incineration.

  Therefore, thermoplastic resins containing no halogen such as polyethylene resin, polypropylene resin, polyester resin, polycarbonate resin, and polyacrylic resin have been proposed as substitute resins for polyvinyl chloride resin. However, since the physical properties of these resins are quite different from those of polyvinyl chloride resins, it is necessary to perform new resin modification and the like in order to use them as materials for information recording media such as cards.

Therefore, in recent years, PETG, which is a kind of amorphous polyester resin, has been noticed and used because it has physical properties similar to polyvinyl chloride. [“PETG” is a trademark of polyester resin manufactured by Eastman Chemical Co., Ltd. It is said to be obtained by a dehydration condensation reaction of ethylene glycol, terephthalic acid and cyclohexanedimethanol. ]
Further, in order to meet the demand for high heat resistance (withstand high temperatures in the passenger compartment, etc.), an alloy resin of PETG and polycarbonate (hereinafter simply abbreviated as PC) has been developed and used for cards. However, PETG generally has a low heat-resistant temperature, and in the case of an alloy resin of PETG and PC, the adaptability to card embossing (characters, etc.) is low, and, for example, a large curl is generated by the embossing. I have it.

  In addition, PETG and PC are easily dissolved or swollen by organic solvents, and the inherent durability deteriorates due to deterioration of the base material due to printing, heating, or pressurization during the manufacturing process of the information recording medium. It may end up.

  Therefore, in the layer structure of the information recording medium, a technique has been developed that uses a biaxially stretched polyethylene terephthalate (hereinafter simply referred to as PET) as the base material on the front and back sides of the card. However, unlike the conventional base material for information recording media, the PET base material has low adhesion to the printing ink (ease of familiarity) and cracks on the surface of the medium during embossing. There are many problems that need to be solved, such as difficulty in processing when the magnetic stripe is embedded in the surface base material, or swelling of the character edge due to the printing energy during laser printing. Conventionally, these are not necessarily suitable materials that can cope with various specifications of information recording media as materials for information recording media such as cards.

  The present invention has been made in view of the problems of the prior art, and compared with the prior art, durability, heat resistance, chemical resistance, suitability for embossing (ease of embossing, low curling property, The cracking resistance), the adhesion of printing inks (ease of compatibility), or the suitability of laser printing can be equal or improved, and in particular, embedding of magnetic stripe tapes. And the flatness of the outer surface of the information recording medium around the embedded area (no step or the step is substantially indistinguishable), and in particular, a concealing layer that conceals the magnetic stripe tape is formed. It is difficult to be attacked by the solvent during the process (highly durable to the solvent, and it is difficult to adversely affect the concealment of the concealing layer), and it is possible to skillfully conceal the embedded magnetic stripe, and to provide an information recording medium that satisfies these the purpose To.

The present invention solves such a problem, and in the present invention according to claim 1, a first surface base material made of a thermoplastic polymer resin, a heat-sensitive adhesive layer made of a thermoplastic polymer resin, and a high thermoplasticity material. An information recording medium in which a center core made of a molecular resin, a heat-sensitive adhesive layer made of a thermoplastic polymer resin, and a second surface substrate made of a thermoplastic polymer resin are relatively laminated in this order. ,
The surface substrate is made of polyethylene terephthalate, a crystalline thermoplastic polymer resin that has been biaxially stretched, and an amorphous polymer resin thermosetting polyurethane on the outer surface of one or both surface substrates. The present invention provides an information recording medium comprising an amorphous thermosetting urethane polymer resin layer made of metal soap.

  Moreover, in this invention which concerns on Claim 2, the mixing ratio of the thermosetting urethane polymer resin used as the said amorphous thermosetting urethane polymer resin layer and metal soap is 100 parts / 1 part by weight ratio- The information recording medium according to claim 1, wherein the information recording medium is 100 parts / 10 parts.

  In the present invention according to claim 3, the orientation direction of the crystalline thermoplastic polymer resin substrate of the first surface substrate and the crystalline thermoplastic polymer resin group of the second surface substrate The information recording medium according to claim 1, wherein the direction of orientation of the materials coincides.

  In the present invention according to claim 4, the amorphous thermosetting urethane polymer resin layer is composed of a polymer having an OH functional group at a terminal and a cross-linking agent isocyanurate having two or more NCO functional groups. 4. The information recording medium according to claim 1, wherein the information recording medium comprises a narate compound.

In the present invention according to claim 5, at least a magnetic stripe is provided on the amorphous thermosetting urethane polymer resin layer, and a concealing layer is provided on the amorphous thermosetting urethane polymer resin layer so as to conceal the magnetic stripe. The information recording medium according to any one of claims 1 to 4, wherein the information recording medium is provided.

  According to the present invention, the first surface substrate made of a crystalline thermoplastic polymer resin that has been subjected to a stretching treatment, the center core, and the second surface comprising a crystalline thermoplastic polymer resin that has been subjected to a stretching treatment. In an information recording medium in which base materials are laminated and integrated, a resin comprising an amorphous thermosetting urethane polymer resin and a metal soap on one or both surfaces of the first surface base material and the second surface base material By forming the layer, the amorphous thermosetting urethane polymer resin layer does not stick to the metal plate of the press by hot pressing, embedding of magnetic stripe, laser engraving printing, transfer of hologram transfer foil to the surface It becomes possible. Further, by using a crystalline thermoplastic polymer resin whose surface has been stretched, the heat resistance of the information recording medium is increased and the durability is improved.

  In other words, according to the present invention, compared to the conventional technology, it requires less labor, durability, heat resistance, chemical resistance, embossing suitability (ease of embossing, low curling property, crack resistance), printing ink The adhesion (ease of compatibility) or the suitability of laser printing can be improved to the same level or higher. Especially, information on the ease of embedding of magnetic stripe tape and the information about the embedded area. It is excellent in the flatness of the outer surface of the recording medium (there is no step or the step is substantially indistinguishable), and it is difficult to be affected by a solvent particularly when forming a concealing layer for concealing the magnetic stripe tape ( It was possible to provide an information recording medium satisfying these requirements, because the durability to a solvent is high and the concealing property of the concealing layer is difficult to decrease), the embedded magnetic stripe can be concealed skillfully.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual sectional view showing the structure of an information recording medium 10 according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing a method for aligning the orientation directions of the crystalline polymer layers of the first surface base material and the second surface base material of the present invention. The direction of orientation in the present invention relates to a direction (component) parallel to the surface of these base materials, and the thickness direction (component) of these base materials is not questioned. Note that the outside refers to the side far from the center core.

  The information recording medium 10 of the present invention shown in FIG. 1 is mainly composed of an amorphous thermosetting urethane polymer resin layer 11, a first surface base material 1, an adhesive layer 8, a center core 7, an adhesive layer 8, and a second. The surface base material 2 and the amorphous thermosetting urethane polymer resin layer 12 are sequentially laminated.

  Next, each configuration will be described. This example is a representative example of the information recording medium of the present invention, and an amorphous thermosetting urethane polymer resin layer is formed on the outer surfaces of the first surface base material 1 and the second surface base material 2. 11 and 12 are formed.

  In addition, the 1st surface base material 1 and the 2nd surface base material 2 consist of crystalline thermoplastic polymer resin polyethylene terephthalate.

  The crystalline thermoplastic polymer resin polyethylene terephthalate of the first surface base material 1 and the second surface base material 2 provides strength, toughness and the like necessary for high durability of the information recording medium, and biaxial stretching. The effect is further strengthened by the treatment. The amorphous thermosetting urethane polymer resin layers 11 and 12 formed on the outer surface of either one or both of the substrates are on the outer surface of the crystalline polymer substrate subjected to the biaxial stretching treatment, The information recording medium is provided with durability, flexibility, surface formability, etc., and the information recording medium is provided with embossing suitability, laser engraving suitability, and magnetic stripe 4 embedding suitability.

  Here, if the thickness of the crystalline polymer base material subjected to the biaxial stretching treatment is thick, the strength and heat resistance of the medium are increased, but on the other hand, the rigidity of the medium is increased and the rigidity is also strong. As a result, the recording medium lacks flexibility as an information recording medium and becomes hard. By providing the amorphous urethane polymer resin layers 11 and 12 as in the present invention on the tough crystalline polymer surface substrates 1 and 2 subjected to the biaxial stretching treatment, the surface substrate In addition, flexibility, embossing suitability, and embedding suitability of the magnetic stripe 4 can be imparted. Furthermore, further, durability of the surface such as chemical resistance and solvent resistance is enhanced by thermosetting the layer of the amorphous urethane polymer resin provided on the surface base material.

  In the present invention, the provision of the amorphous urethane polymer resin layer does not necessarily have to be provided on both the surface base material 1 and the surface base material 2, but a layer configuration provided only on one of the surfaces, that is, Alternatively, a layer configuration in which only one of the amorphous thermosetting urethane polymer resin layers 11 and 12 is provided may be employed. However, when only one is used, for example, the magnetic stripe is provided on the side where the amorphous thermosetting urethane polymer resin layer is present. This is because it is excellent in view of suitability for processing to embed a magnetic stripe, and concealment property of concealing the presence of the magnetic stripe so that it cannot be easily seen in appearance or the like.

  In order to embed the magnetic stripe 4 or the like in the information recording medium so that no step is generated on the surface of the information recording medium according to the present invention, the amorphous thermosetting urethane polymer resin layers 11 and 12 are made thick. On the other hand, if the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 is increased, the flexibility of the information recording medium is increased, but the strength and heat-resistant temperature of the medium are weak. Tend to be. Performance that requires an information recording medium to obtain a balance between the thickness of the crystalline thermoplastic polymer base polyethylene terephthalates 1 and 2 and the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 It is important to design appropriately considering quality.

  The present invention relates to the thickness of the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin and the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 (here, the amorphous thermosetting urethane polymer). As for the resin layer, only one side may be provided as described above) (a) The thickness of the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin is 25 to 150 μm, respectively, and the amorphous thermosetting The type urethane polymer resin layers 11 and 12 have a thickness of 5 to 20 μm, preferably (b) “the thickness of the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin (for one layer)” It is set to be at least twice the “thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 (for one layer)”. Otherwise, the above characteristics (strength, heat resistance, rigidity, hardness, etc.) of the information recording medium will be unsatisfactory in practice. Here, the thickness of the amorphous thermosetting urethane polymer resin layer is relatively more important than the thickness of the surface base material (1, 2) of the crystalline thermoplastic polymer resin. .

  In general, from the viewpoint of preventing or reducing warpage, the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin should have the same thickness (or the same as appropriate). Is preferred. In addition, for the amorphous thermosetting urethane polymer resin layer, [if it is provided on both sides, for the same reason as in the case of the surface base material], the thickness of each is generally the same (or as appropriate) It is preferable that the information recording medium be warped in the thickness direction of the information recording medium when the layer configuration is non-target or the arrangement of components is non-target. In this case, as a countermeasure against deformation, for example, the thickness of the surface base material or the thickness of the amorphous thermosetting urethane polymer resin layer is appropriately selected within the above numerical range. Yes.)

In order to easily integrate the first surface base material 1, the center core 7 and the second surface base material 2 by heat and pressure, the crystalline thermoplastic polymer is used. A heat-sensitive adhesive layer 8 composed of a plastic polymer resin layer having a relatively low heat melting temperature is formed between the surface base materials 1 and 2 and the center core 7 of the polymer resin, respectively, The surface base material 1, the center core 7, and the second surface base material 2 can be easily laminated and integrated. The heating temperature and pressurizing pressure are not limited as long as they can be adhered, and can be set as appropriate depending on the material. However, when a heat-sensitive adhesive composed of a thermoplastic polymer resin layer having a melting temperature Tm of 120 to 200 ° C. is used. In general, it is preferable to select appropriately between a temperature of 100 to 150 ° C. and a pressure of 500 to 1500 kPa. Examples of the thermoplastic polymer resin used as the heat-sensitive adhesive include simple thermoplastic polymer resins such as polyurethane resin, vinyl chloride resin, vinyl acetate resin, polyester resin, polyolefin resin, acrylic resin, or a mixture of these resins. In addition, modified resins can be used.

  In addition, as a procedure for the formation of the amorphous thermosetting urethane polymer resin layers 11 and 12 and the integration by lamination, for example, (a) a polyethylene terephthalate substrate surface 1 of a crystalline thermoplastic polymer resin in advance, 2 or on one surface, the amorphous thermosetting urethane polymer resin layers 11 and 12 are formed, and the second surface substrate 2 is formed between the first surface substrate 1 and the center core 7. Forming a heat-sensitive adhesive layer 8 between the first surface base material 1, the center core 7, and the second surface base material 2 to perform integration or the like, or (B) A heat-sensitive adhesive layer 8 is formed between the second surface base material 2 and the center core 7 between the first surface base material 1 and the center core 7, respectively, After integrating the center core 7 and the second surface base material 2 once by lamination Amorphous thermosetting urethane polymer resin layers 11 and 12 are formed on either or both surfaces of the first surface base material 1 and the second surface base material 2 corresponding to the surface of the laminate. Good.

  The heat-sensitive adhesive layer 8 can be formed by, for example, (a) providing a crystalline thermoplastic polymer resin on the surface of the polyethylene terephthalate substrate in contact with the center core, or (b) sequentially forming on both surfaces of the center core. You can do either.

  Examples of the crystalline thermoplastic polymer resin include PET (polyethylene terephthalate), PEN (polyethylene naphthalate) polyvinyl alcohol, polyolefin, polylactic acid, polyethylene / vinyl alcohol, polyacrylonitrile, and polypropylene. However, from the viewpoint of heat resistance, durability, cost, and processability of the information recording medium, it is more preferable to use polyethylene terephthalate (hereinafter abbreviated as PET) that has been subjected to biaxial stretching treatment in the present invention. Regarding the color of PET, a transparent or colored substrate can be used depending on the configuration and specifications of the medium.

  In order to give the surface base materials 1 and 2 flexibility, embossability, and embedding suitability of the magnetic stripe 4, for example, the surface of the surface base materials 1 and 2 is made of amorphous thermoplastic polymer resin layers 11 and 12. An effect is acquired by providing. On the other hand, however, there are drawbacks that surface durability, chemical resistance, heat resistance, and solvent resistance are weakened. Therefore, it was thought that it would be preferable to simply use a thermosetting resin as the amorphous polymer resin layer, but the thermosetting polymer resin is generally tough and has poor surface wettability. There are disadvantages such as being difficult to apply.

  Focusing on these, in the present invention, as a thermosetting resin that does not deteriorate the properties (advantages) of surface flexibility and printability, in particular, a urethane resin composed of a cross-linking reaction between OH and NCO is employed. I found. That is, by adding an isocyanate compound cross-linking agent having two or more NCO functional groups to the polymer having an OH functional group at the terminal, the OH and NCO are cross-linked to improve the durability of the polymer resin. It is something to be made. According to this, when the crosslink density of OH and NCO of the thermosetting urethane resin is too low, the resin becomes soft and durability such as heat resistance is lowered. On the other hand, if the crosslinking density is too high, the resin is hard and tough, and the surface wettability is deteriorated. Therefore, in the present invention, the OH value related to the crosslinking rate is set to 1 to 20 mgKOH / g, and thereby, characteristics with good balance such as toughness, flexibility, durability, and surface wettability can be obtained.

  As the polymer having an OH functional group at the terminal used for the amorphous thermosetting urethane polymer resin layers 11 and 12, for example, a polyester polymer having an OH functional group at the terminal, polyester polyol, polyester urethane, polyurethane, Polyurethane polyol, acrylic polyol, etc. can be used.

  In order to perform emboss printing on the surface of the medium, it is preferable to use a polymer that is easily stretched and has an elastic modulus of 500 to 2,500 MPa and that is easy to form in order to prevent cracks on the surface of the recording medium due to emboss printing. If the elastic modulus is too high, the resin rigidity is high and the plastic deformation due to secondary processing such as embossing cannot be followed, cracking may occur, or the embossing height of the plastic deformation may be low. However, if the elastic modulus is too low, the resin becomes soft, the surface of the medium is weak, and is easily damaged. As isocyanate compounds having two or more NCO functional groups, there are TDI (toluene diisocyanate), MDI (methylene diisocyanate), XDI, IPDI, and HDI, but there is no XDI due to ultraviolet rays or the like, It is preferable to use IPDI, HDI or the like.

  As the procedure of the amorphous thermosetting urethane polymer resin layers 11 and 12, the surface of the polyethylene terephthalate base material 1 or 2 of the crystalline thermoplastic polymer resin is previously or Amorphous thermosetting urethane polymer resin layers 11 and 12 are formed on one surface, between the first surface base material 1 and the center core 7, and between the second surface base material 2 and the center core 7. In the case where the heat-sensitive adhesive layer 8 is formed and the first surface base material 1, the center core 7, and the second surface base material 2 are laminated to perform integration or the like, A thermal laminate that integrates the center core by heating and pressing. Generally, the laminate is sandwiched between metal plates (for example, ferro plates) and heated and pressed, but the amorphous thermosetting type formed on the surface. The urethane polymer resin is attached to the metal plate by heat and pressure, and the There may not peel off after sulfonates. In order to prevent this, it is generally necessary to put a release film between the metal plate and the laminate so that the amorphous thermosetting urethane polymer resin does not come into contact with the metal plate. Therefore, it takes time and labor for laminating, leading to high costs.

  In order to prevent the amorphous thermosetting urethane polymer resin layer from sticking to metal due to heating, generally add a silicone release agent, lubricant, wax agent, etc. to the amorphous thermosetting urethane polymer resin layer. There is a way. However, in the presence of a silicone release agent, lubricant, and wax agent, when further processing is performed on the surface, for example, when surface printing, hologram foil transfer, etc. is performed, the adhesive layer of the printing ink or transfer foil is not coated on the surface of the substrate. Resisted by silicone release agents, lubricants, waxes, etc., making it impossible to process.

  Therefore, the present invention solves the above problems by adding metal soap to the amorphous thermosetting urethane polymer resin layer. Metal soap refers to fatty acid salts of metals other than alkali metals, and metal stearates are recommended in the present invention. For example, magnesium stearate, calcium stearate, zinc stearate, copper stearate, aluminum stearate, cobalt stearate and the like can be used. If the amount of metal soap added is small, the effect of the amorphous thermosetting urethane polymer resin layer not sticking to the metal plate will be reduced, but if the amount of metal soap added is large, the amorphous thermosetting urethane polymer will be reduced. The resin layer does not stick to the metal and is easily peeled off from the metal plate. However, adhesion to the printing ink layer or transfer foil may be weakened. Therefore, in the present invention, the mixing ratio of the thermosetting urethane polymer resin to be the amorphous thermosetting urethane polymer resin layer and the metal soap is 100 parts / 1 part to 100 parts / 10 parts by weight. If the addition amount is within the range, the amorphous thermosetting urethane polymer resin layer does not stick to the metal, and processing such as printing on the surface and transfer of the transfer foil can be performed without any trouble.

In order to form the resin layers 11 and 12 made of the amorphous thermosetting urethane polymer resin and the metal soap on the surfaces of the surface base materials 1 and 2 made of the crystalline thermoplastic polymer resin, an OH functional group is formed at the terminal. Metal soap is added to a mixed solution of a polymer-containing polymer solution and an isocyanate compound cross-linking agent having two or more NCO functional groups, and the mixture is sufficiently stirred and dispersed. It can be applied to the surface of the intermediate substrate or previously applied to the surface of another intermediate substrate and then transferred to the surface substrates 1 and 2 described above. As a method for applying the mixed solution, for example, a gravure coater, a knife coater, a printing device, or the like can be used.

  Further, when the amorphous thermosetting urethane polymer resin layers 11 and 12 are formed on the surface of the base material of the information recording medium, the first surface base material 1, the center core 7, and the second surface base material 2 are formed. Before the lamination and integration, the amorphous thermosetting urethane polymer resin layers 11 and 12 are formed on the surface bases 1 and 2 in advance, and then the lamination is integrated, or the lamination is integrated in advance. Either method is used to produce the effect on the surface of the information recording medium. It is also possible to further modify the resin by adding additives such as organic pigments, inorganic pigments or organic dyes, inorganic dyes, stabilizers, and surfactants to these resins.

  By carrying out the biaxial stretching treatment of the crystalline thermoplastic polymer resin, the strength and durability of the surface base material can be increased. However, since the base material subjected to the biaxial stretching treatment has anisotropy, the base material has different strengths and thermodynamic properties in different directions. The information recording medium formed by laminating and integrating the first surface base material 1, the center core 7, and the second surface base material 2 includes the first surface base material 1 and the second surface base material 2. If the orientation directions of the polymers do not match, the medium is easily warped, twisted, or curled. Therefore, as shown in claim 2 of the present invention, the polymer orientation of the first surface base material 1 and the polymer orientation of the second surface base material 2 are laminated as shown in FIG. However, it is important to align the directions of polymer orientation between the two so as to be in the same direction.

  Here, FIG. 2 shows a conceptual diagram of the molecular orientation of the base material. In the figure, the circles and lines drawn on the upper and lower base materials are two base materials to be superposed (crystalline thermoplastic polymer resin). This shows that the orientation directions of the base material 12 and 22) are aligned in the same direction. This molecular orientation pattern can be seen by looking at the change in the transmitted microwave intensity due to the anisotropy of the dielectric constant of the sample. For example, the molecular orientation meter [Oji Scientific Instruments Co., Ltd., MOA-3000 series] is used. be able to.

  A surface group of a laminate comprising the amorphous thermosetting urethane polymer resin layers 11 and 12 according to the present invention laminated and integrated with a first surface base material 1, a center core 7, and a second surface base material 2. In the case of forming on the surface of the material, for example, from the material positioned side by side in the longitudinal direction (MD direction; longitudinal direction of winding of the web) of the material of the surface substrate that is a web-like film, The base sheet of 1 and the surface base material 2 is taken, the vertical direction and a horizontal direction (TD direction. The width direction of a web) are mutually aligned, and the center core 7 is united and laminated | stacked together on the core side. A layer of an amorphous thermosetting urethane polymer resin according to the present invention is provided on both surface sides or one surface side of the laminate thus obtained.

  When processing the film of the surface substrate used for each of the first surface substrate 1 and the second surface substrate 2, the surface substrate is first slitted to a certain width so that the orientation of the polymer is not mistaken. From the longitudinal direction (MD direction) of the slitted surface base sheet, the film sheets of the first surface base material 1 and the second surface base material 2 are taken from the front and back directions of the film. After stacking so that the longitudinal direction (MD direction) and the lateral direction (TD direction) of the stretching are aligned, the corner of the surface base sheet with the aligned polymer orientation is cut or cut at the edge of the sheet It is preferable to insert a mark.

Before the first surface base material 1, the center core 7 and the second surface base material 2 are laminated and integrated, the crystalline thermosetting urethane polymer resin layers 11 and 12 are preliminarily attached to the first surface base material 1. And second surface substrate 2
In the case of forming each on the surface on the side far from one of the center cores, the direction of the polymer orientation of the surface substrates 1 and 2 must also be aligned.

  For example, the amorphous thermosetting urethane polymer resin layer 11 is first formed on the front surface of the film wound first from the longitudinal direction (MD direction), and thus the front-rear direction of winding the film. Material 1 is assumed. Then, a non-crystalline thermosetting urethane polymer resin layer 12 is formed on the back surface of the film that has been unwound and used as the surface substrate 2. When stacking and integrating, the surface base material 1 is the upper surface of the information recording medium, the center core 7 is formed, and the lower surface is the surface base material 2. The amorphous thermosetting urethane polymer resin layers 11 and 12 of the surface base material 1 and the surface base material 2 are made to be media outer surfaces, respectively, and the longitudinal direction of the polymer of the surface base material 1 and the surface base material 2 (MD direction) ) And the horizontal direction (TD direction).

  When the magnetic stripe 4 is formed on the surface of the amorphous thermosetting urethane polymer resin layers 11 and 12 and used as an information recording medium with a magnetic stripe recording layer, the above amorphous thermosetting urethane polymer resin layer is previously provided. Before the surface base materials 1 and 2 and the center core 7 on which the layers 11 and 12 are formed are laminated and integrated, the magnetic stripe 4 is arranged on the amorphous thermosetting urethane polymer resin layers 11 and 12 and the surface The substrates 1 and 2 and the center core 7 are laminated and integrated, and the magnetic stripe 4 is embedded in the substrate surface to make the surface flush. Alternatively, after the surface base materials 1 and 2 and the center core 7 are laminated and integrated, the magnetic stripe 4 is arranged on the amorphous thermosetting urethane polymer resin layers 11 and 12, and the heating and pressurizing integration is performed once again. Then, the magnetic stripe 4 is embedded in the surface of the substrate to make the surface flush. In this case, the amorphous thermosetting urethane polymer resin layers 11 and 12 may be formed on the surface base material in advance, or may be formed after the surface base material and the center core are laminated and integrated.

  The ID information and the pattern are formed on the surfaces of the crystalline thermoplastic polymer resin substrates 1 and 2 or on the entire surface or part of the surfaces of the amorphous thermosetting urethane polymer resin layers 11 and 12 formed on the surfaces. A printed layer such as a design may be provided. Further, in order to improve the adhesion between the surface substrate and the printing layer, the amorphous thermosetting urethane polymer resin layers 11 and 12 and the printing layer, the surface of the surface substrate or the amorphous thermosetting urethane The surface of the molecular resin layer may be subjected to easy adhesion treatment (for example, corona discharge treatment, plasma treatment, or resin coating).

  Furthermore, other functional thin film layers, for example, on the surface of the surface base material 1 and the surface of the amorphous thermosetting urethane polymer resin layers 11 and 12 formed on the surface of the surface base material 2 or the surface of the printing layer, for example The hiding layer, the protective layer, the visible recording layer, the hologram layer 5 and the like may be provided on the entire surface or a part thereof. Further, when the magnetic stripe 4 is formed in the amorphous thermosetting urethane polymer resin layers 11 and 12 as described above, the magnetic stripe 4 is embedded in the surface, the surface is flushed, and then the magnetic stripe 4 is formed. A concealing layer 3 for concealing 4 may be provided. Further, the magnetic recording layer, the magnetic stripe 4, the concealing layer 3, and the protective layer 6 may be formed, and the surface of the magnetic recording medium may be flushed by heating and pressing.

  The center core 7 is made of an amorphous thermoplastic polymer resin. For example, polyvinyl chloride, polyvinyl acetate, polyvinyl butyral, polyvinylidene chloride, polyvinyl acetal, AS resin, polycarbonate, polymethyl methacrylate, polystyrene, ABS resin, polysulfone, celluloid, polyphenylene oxide, amorphous elastomer, PETG, etc. Amorphous solids such as composites, alloys, and blends of these synthetic resins, natural resins, or modified resins of these resins, alone or in combination, can be used. Furthermore, additives such as organic pigments, inorganic pigments or organic dyes, inorganic dyes, stabilizers, and surface active agents can be added to these resins to modify the resins.

Further, the center core 7 may use a multilayer structure of the polymer resin as necessary. For example, two center core layers or two or more center core layers are integrated by heating and pressing in advance and used as the center core 7, or the first surface base material 1, the center core 7, the second surface When the base material 2 is integrated, it can be laminated and integrated together.

Further, as shown in the figure, a non-contact IC module 9 with an antenna in the center core 7 is provided.
Can also be embedded. For example, the center core 7 is made into two layers, the non-contact IC module 9 with an antenna is arranged between the two layers, and the IC module 9 is embedded in the center core 7 by thermal lamination.

  The IC module 9 includes an antenna coil for receiving and transmitting (here, “antenna coil” refers to a coiled antenna in the present specification), a memory for storing data, and in some cases for data calculation, etc. CPU, energy supply battery (not shown), and the like. In order to avoid undesirably affecting the appearance, shape, etc. of the resulting non-contact IC card (a representative example of the information recording medium according to the present invention), it is preferable that the IC module 9 be as thin as possible. Further, since the IC module 9 is easy to handle and low in cost, a printed circuit board type integrated module may be used.

  When a non-contact IC card recording medium is produced by sandwiching the IC module 9 between two substrates and heating and pressurizing, the heating temperature is increased to smooth the surface of the card recording medium, It is preferable to embed the IC module by flowing the base resin from above and below the IC module by pressure. At that time, in order to reduce the pressure applied to the chip, it is better to pressurize after heating the base resin. In addition, a hole of the same size as the electrical component such as a chip mounted on the IC module 9 is formed on the base material of the center core, and the IC module 9 is installed on the base material so that the electrical component such as a chip is embedded in the hole. Then, it is preferable to perform heating and pressurization.

  Since the crystalline thermoplastic surface base materials 1 and 2 and the amorphous thermoplastic center core 7 can be easily laminated and integrated, the first surface base material 1 and the center core 7 can An adhesive layer 8 is provided between each of the second surface base material 2 and the center core 7. Whether the adhesive layer 8 is provided on the surface of the center core in contact with the surface base material or the inner surface of the surface base material as the center core by using a general printing method or coating method. ,both are fine. Further, as described above, the center core, which is composed of two or more centers and integrates the center core in advance by thermal lamination, it is better to form the adhesive layer on the surface after the integration. This is because if the adhesive layer is formed on the surface of the center core and then the center core is laminated, the adhesive layer sticks to the metal plate of the laminate. In addition, when forming an adhesive layer on the inner surface of the surface base material in contact with the center core, the surface of the surface base material is previously formed with the thermosetting polyurethane layer of the amorphous polymer resin of the present invention. An adhesive layer is formed on the other surface of the substrate, or an adhesive layer is previously formed on the surface of the surface substrate, and then the amorphous polymer resin thermosetting polyurethane of the present invention is formed on the opposite surface. Either layer may be formed.

  Furthermore, functional layers such as a printing layer and a concealing layer may be provided between the surface base materials 1 and 2 and the center core 7 depending on the application. When transparent PET is used for the surface substrate, the printed layer is protected by the surface substrate by providing the printed layer between the surface substrates 1 and 2 and the center core, and the durability of the printed layer is increased. Further, depending on the specifications of the information recording medium, an intermediate base material can be provided between the first surface base material 1 and the center core 7 and between the second surface base material 2 and the center core 7, respectively. An adhesive layer, a printing layer, etc. can also be provided on the surface of the intermediate substrate.

As a method for stacking and integrating information recording media with a non-contact IC module 9, the first surface base material 1, the base material of the center core 7, the IC module 9, the base material of the center core 7, the second surface base material 1 is a method in which two layers are sequentially stacked and heated and pressed. First, the base material of the center core 7, the IC module 9, and the base material of the center core 7 are sequentially stacked and subjected to primary heating and pressurization. First, the substrate of the IC module 9 and the center core 7 is integrated, and then the first surface substrate 1 and the second surface group are formed on the upper and lower surfaces of the center core 7 in which the IC module 9 is embedded. There is a two-time system in which the materials 2 are stacked and subjected to secondary heating and pressing. In either method, the amorphous thermosetting urethane polymer resin layers 11 and 12 are either formed in advance on the surface of the surface base materials 1 or 2 or laminated and then formed. . However, since the adhesive adheres to the metal plate, first, the base material of the center core 7, the IC module 9, and the base material of the center core 7 are sequentially laminated, and primary heating and pressurization are performed. When the base material of the center core 7 is first integrated, the adhesive layer is not formed on the center core 7 in advance, but the center core 7 is integrated and then formed on the surface of the center core. Formed on the inner surface of the materials 1 and 2 (surface on the side in contact with the center core).

  FIG. 1 is an explanatory diagram showing the configuration of the information recording medium 10 according to the first embodiment of the present invention in each step.

  A white biaxially stretched polyethylene terephthalate film having a thickness of 100 μm is used as a surface base material of a crystalline thermoplastic polymer resin, and an amorphous polyester urethane having an OH functional group at the terminal and HMDI (hexamethylene diisocyanate) having the following composition: The mixture was an amorphous thermosetting urethane polymer resin.

<Composition>
Polyester urethane UR1400 (Toyobo KOH 2-3 mg / g) 100 parts TDI Takenate D202 (manufactured by Takeda Pharmaceutical) 3 parts Zinc stearate 4 parts MEK 50 parts Toluene 60 parts On the surface of the biaxially stretched polyethylene terephthalate substrate, the above mixed solution is applied with a gravure coater so that the coating film has a thickness of 10 μm, and one sheet having a length of 400 mm is taken. Was cut into a surface substrate 1 of the present invention. Next, the above-mentioned mixed solution was applied to the surface of the back side of the white biaxially stretched polyethylene terephthalate base material having a width of 400 mm by a gravure coater so that the coating film had a thickness of 10 μm. One sheet of 400 mm was taken, and the left side in the front direction was corner cut to obtain the surface substrate 2 of the present invention.

An integrated IC module with an etching antenna made of copper foil with a thickness of 18 μm is used as an IC.
Used as module 9. This 18 μm-thick copper foil was provided as a foil on the substrate, and here, the copper foil already used for antenna patterning by etching was used. Here, the thickness of the substrate is 50 μm, and the thickness of the IC chip component including the chip sealing material is 250 μm, and the size is 2 × 2 mm.

Amorphous polyester resin that is a white base material with a size of 400 mm × 400 mm and a thickness of 500 μm; both PETG [bending elastic modulus is 1,980 MPa, glass transition point (Tg) is 63 ° C.] As a base material used for the center core 7, the IC module 9 is installed between the two base core 7 base materials, and the laminate is set in a hot press machine. They were integrated by hot pressing under a pressure of about 1,000 kPa. Thus, the laminated body containing the IC module 9 was used as the center core 7 of the present invention. Further, an adhesive having a thickness of 5 μm was applied to the front and back surfaces of the center core 7 to form an adhesive layer.
Polyester resin Byron S200 (manufactured by Toyobo Co., Ltd.) 100 parts MEK 20 parts Toluene 20 parts Further, the surface base material 1 and the surface base material 2 are placed on the front and back surfaces of the center core 7, respectively. The molecular resin layers 11 and 12 were placed outside, and the surface cores 1 and 2 were laminated so that the corner cut portions of the surface base material 1 and the surface base material 2 matched, and the center core was sandwiched.

  On the surface of the laminated body thus laminated (on the amorphous thermosetting urethane polymer resin layer 11 side), a magnetic stripe tape is provided so that the magnetic stripe 4 is placed on the surface by transfer, The laminated body was sandwiched between metal plates and set in a hot press machine, and heat pressing was performed under the conditions of a temperature of 135 ° C. and a pressure of about 1,000 kPa, and they were integrated. Then, an integrated laminate was obtained. At this time, the amorphous thermosetting urethane resin did not stick to the metal plate of the hot press, and the laminate was easily separated from the metal plate. Further, the surface of the magnetic stripe 4 of the laminate and the surface of the base material surface where there is no magnetic stripe (on the amorphous thermosetting urethane polymer resin layer 11 side) are flush with each other, and there is no step due to the magnetic stripe. The outer surface became flat.

  On the surface of the laminate on the magnetic stripe 4 side, a concealing layer 3 made of a commercially available silver ink was formed with a thickness of 2 μm by a screen printer, and further a protective layer 6 made of a clear resin was formed, and again The information recording medium 10 according to Example 1 was obtained by applying gloss to the surface by heating and pressurization, and then cutting into a card (so-called IC card) shape.

  The surface of the obtained information recording medium 10 was smooth, and the magnetic stripe 4 was concealed. Further, the hologram transfer foil was transferred to the surface of the information recording medium to provide the hologram layer 5, and printing by laser marking was performed to form a laser stamped character 6. There was no problem in transferring the hologram, and there was no swelling of the character edge of the laser engraved printing. When the heat resistance temperature of the information recording medium was evaluated, a heat resistance temperature as high as 95 ° C. was obtained. Further, the magnetic characteristics evaluated due to the provision of the magnetic stripe can sufficiently satisfy the JIS standard.

  The present invention is a card represented by a cash card, a credit card, an ID card (identification card), a driver's license, a member's card, a prepaid card, etc., or a tag (generally, a tag, token, or An information recording medium referred to as a transponder or the like, which is a contact type IC card (provided with a contact type communication function via an external terminal), particularly (provided on the card) Application to a non-contact IC card (provided with a non-contact type communication function via a connected antenna or coil) or a composite IC card (having both the above-mentioned contact type communication and non-contact type communication functions) It is done.

It is sectional drawing which shows the information recording medium structure concerning Example 1 of this invention. It is a conceptual diagram which shows the method of aligning the orientation direction of a polymer base material of the 1st surface base material and 2nd surface base material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st surface base material 2 ... 2nd surface base material 3 ... Concealment layer (printing layer)
4 ... Magnetic stripe 5 ... Hologram layer 6 ... Protective layer 7 ... Center core 8 ... Adhesive layer 9 ... IC module 10 ... Information recording medium 11 ... Amorphous Thermosetting urethane polymer resin layer 12 ... Amorphous thermosetting urethane polymer resin layer 39 ... Orientation pattern measured by microwave polymer orientation meter

Claims (5)

First surface base material made of thermoplastic polymer resin, heat-sensitive adhesive layer made of thermoplastic polymer resin, center core made of thermoplastic polymer resin, heat-sensitive adhesive layer made of thermoplastic polymer resin, and thermoplastic The second surface base material made of a polymer resin is an information recording medium laminated relatively in this order,
The surface substrate is made of polyethylene terephthalate, a crystalline thermoplastic polymer resin that has been biaxially stretched, and an amorphous polymer resin thermosetting polyurethane on the outer surface of one or both surface substrates. An information recording medium comprising an amorphous thermosetting urethane polymer resin layer made of metal soap.   The mixing ratio of the thermosetting urethane polymer resin and the metal soap used as the amorphous thermosetting urethane polymer resin layer is 100 parts / 1 part to 100 parts / 10 parts by weight. The information recording medium according to claim 1.   The orientation direction of the crystalline thermoplastic polymer resin substrate of the first surface substrate and the orientation direction of the crystalline thermoplastic polymer resin substrate of the second surface substrate coincide with each other. The information recording medium according to claim 1, wherein:   The amorphous thermosetting urethane polymer resin layer is composed of a polymer having an OH functional group at a terminal and an isocyanate compound of a crosslinking agent having two or more NCO functional groups. The information recording medium according to any one of 1 to 3.   2. The amorphous thermosetting urethane polymer resin layer, wherein at least a magnetic stripe is provided, and a concealing layer is provided thereon so as to conceal the magnetic stripe. 5. The information recording medium according to any one of 4 to 4.

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