JP5374038B2 - card - Google Patents

Description

  The present invention relates to a card using a polyester resin containing a diol unit having a cyclic acetal skeleton. Specifically, among cards typified by a cash card, a credit card, an ID card, and an ETC card, the card can be used particularly in applications requiring heat resistance.

Conventionally, in the fields of cash cards, credit cards, ID cards, etc., polyvinyl chloride (PVC) resins and vinyl chloride / vinyl acetate copolymers have been mainly used as card materials. PVC resin is excellent in physical mechanical characteristics, embossability of character portions, and the like, and is widely used as a card material at present.
Normally, two thick white sheets called core sheets are placed inside, and two transparent sheets called oversheets are placed outside the front and back sides of the core sheet. From the oversheet / core sheet / core sheet / oversheet A total of four sheets are thermally fused together to form a card.

  However, in recent years, the use of cards is not limited to cash cards, credit cards, ID cards, etc., but has been used in various areas such as commuter passes, telephone cards, licenses, ETC in-vehicle cards, etc. . Therefore, the material used for such a card is required to have higher flexibility than conventional ones, including flexibility, scratch strength, tensile strength, heat resistance characteristics, and chemical resistance. Also, PVC resin has been pointed out to be related to the generation of dioxins in disposal after use, especially the problem of generating hydrogen chloride gas at the time of incineration and damaging the incinerator, and its relationship is not clarified.

  As a card material that has excellent mechanical properties and does not cause disposal problems due to these circumstances, for example, a substantially non-crystalline polyester resin in which a part of the ethylene glycol component in polyethylene terephthalate is substituted with 1,4 cyclohexanedimethanol ( PETG cards using PETG) are attracting attention. PETG has card processing suitability close to that of vinyl chloride in card processing such as printing, magnetic tape application, and press fusing, and has the advantage that it can be carded using the same equipment as the PVC sheet. However, the glass transition temperature of PETG is around 80 ° C. With a card made of only PETG material, the embossed characters are easily cracked, the emboss is easily deformed by heat, and the card is bent when used at a high temperature. There was a problem that.

  In recent years, cash cards, credit cards, etc. have been embossed with multiple lines of characters, such as four-line embossing, so the problems of embossability and card warpage after embossing have become particularly prominent. Yes. Further, in an in-vehicle application, the temperature in the car is about 60 ° C. in summer, and heat resistance of at least 70 ° C. or more is necessary to prevent the card from being distorted or curled.

  Therefore, in order to improve heat resistance, it is considered that PETG and polycarbonate (PC) are multilayered and used as an oversheet of the card surface layer, and that a resin obtained by blending PETG and PC is used as a core sheet ( For example, Patent Documents 1 to 4).

  However, although PC has a glass transition temperature as high as 145 ° C. and heat resistance is improved, sheet formability is deteriorated and embossability is still insufficient. That is, when PETG and PC are blended and melt-kneaded, an ester carbonate reaction occurs, and the sheet easily foams, the sheet is colored brown, or the physical properties deteriorate. Furthermore, the tensile yield strength of the sheet becomes too large due to the effect of the PC, and if the card obtained from this sheet is embossed, the card will be greatly curled, and the embossed curl described later will not fit within the regulations. Will occur.

On the other hand, a polyester resin containing a diol having a cyclic acetal skeleton (for example, Patent Document 5 and Patent Document 6) is a polyester resin that has improved heat resistance of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) while having high transparency. Therefore, it can be used in applications requiring transparency and heat resistance.
Japanese Patent Laid-Open No. 2000-230369 JP 2002-96440 A JP 2002-144511 A JP 2004-130742 A JP 2002-69165 A JP 2004-67830 A

  In view of the above situation, the object of the present invention is to use a polyester resin containing a diol unit having a cyclic acetal skeleton as a card material, thereby improving the problems of embossability and card warpage during use. To provide a card.

  As a result of intensive studies, the present inventors have improved the heat resistance by using a polyester resin containing a diol unit having a cyclic acetal skeleton as a card material, thereby improving the problems of embossability and card warpage during use. And the present invention has been reached.

（式中、Ｒ^１およびＲ^２はそれぞれ独立して、炭素数が１〜１０の脂肪族炭化水素基、炭素数が３〜１０の脂環式炭化水素基、及び炭素数が６〜１０の芳香族炭化水素基からなる群から選ばれる炭化水素基を表す。）

（式中、Ｒ^１は前記と同様であり、Ｒ^３は炭素数が１〜１０の脂肪族炭化水素基、炭素数が３〜１０の脂環式炭化水素基、及び炭素数が６〜１０の芳香族炭化水素基からなる群から選ばれる炭化水素基を表す。） That is, the present invention is the following card.
A card having at least an oversheet layer and a core sheet layer, wherein at least one layer selected from the oversheet layer and the core sheet layer is composed of a resin layer containing the following polyester resin (A), and the Macbeth concentration measured by a Macbeth densitometer A card characterized by a 1.0-5.0.
Polyester resin (A): a polyester resin having a dicarboxylic acid structural unit and a diol structural unit, wherein at least 10 to 60 mol% of the diol structural unit is represented by the following formula (1) or (2) A polyester resin which is a unit derived from a diol having a skeleton.

(In the formula, R ¹ and R ² are each independently an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, and 6 to 10 carbon atoms. Represents a hydrocarbon group selected from the group consisting of aromatic hydrocarbon groups.)

(In the formula, R ¹ is the same as above, R ³ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, and 6 to 10 carbon atoms. Represents a hydrocarbon group selected from the group consisting of aromatic hydrocarbon groups of

  The card of the present invention has good heat resistance and moldability of the resin used, so it can prevent emboss cracks and warpage during embossing, and also prevents warpage and deflection when used at high temperatures such as in-vehicle. It becomes possible.

  The card | curd of this invention aims at solution of the said subject by using the polyester resin (A) containing the diol unit which has cyclic acetal frame | skeleton for core sheet material and / or oversheet material.

  The present invention is described in detail below. The card of the present invention is a card having at least an oversheet layer and a core sheet layer. The card of the present invention has two oversheet layers as the surface layer of the card. The card of the present invention has at least one core sheet layer between the two oversheet layers. The card of the present invention preferably has two core sheet layers. That is, a card having a total of four sheet layers composed of oversheet / core sheet / core sheet / oversheet is preferable. The thickness of the core sheet and the oversheet can be arbitrarily selected. Generally, the thickness of the concealable sheet used for the core sheet is 100 μm to 1 mm, and the thickness of the transparent sheet used for the oversheet is 20 μm to 200 μm. Is preferred.

The polyester resin (A) used for the card | curd of this invention contains 10-60 mol% of diol units which have a cyclic acetal frame | skeleton in a diol unit. The diol unit having a cyclic acetal skeleton is a unit derived from the compound represented by the general formula (1) or (2).
As the compounds of the general formulas (1) and (2), 3,9-bis (1,1-dimethyl-2-hydroxyethyl) -2,4,8,10-tetraoxaspiro [5.5] undecane, or 5-methylol-5-ethyl-2- (1,1-dimethyl-2-hydroxyethyl) -1,3-dioxane is particularly preferred.

  The polyester resin (A) used in the card of the present invention contains 10 to 60 mol%, preferably 15 to 55 mol%, more preferably 20 to 50 mol% of a diol unit having a cyclic acetal skeleton in the diol unit. When the diol unit is less than 10 mol%, the heat resistance of the polyester resin is often not sufficient, and the crystallinity is increased, resulting in poor moldability. Further, when the amount is more than 60 mol%, the crystallinity becomes large, so that the moldability is deteriorated, and the glass transition temperature becomes too high, so that a high temperature is required at the time of thermal fusion between the oversheet and the core sheet. There's a problem.

  In addition, the diol unit other than the diol unit having a cyclic acetal skeleton is not particularly limited, but ethylene glycol, trimethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol Aliphatic diols such as propylene glycol and neopentyl glycol; polyether diols such as polyethylene glycol, polypropylene glycol and polybutylene glycol; 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 1,2- Decahydronaphthalene diethanol, 1,3-decahydronaphthalene diethanol, 1,4-decahydronaphthalene diethanol, 1,5-decahydronaphthalene diethanol, 1,6-decahydronaphthalene Cycloaliphatic diols such as dimethanol, 2,7-decahydronaphthalene diethanol, tetralin dimethanol, norbornane dimethanol, tricyclodecane dimethanol, pentacyclododecane dimethanol; 4,4 ′-(1-methylethylidene ) Bisphenols such as bisphenol, methylene bisphenol (bisphenol F), 4,4′-cyclohexylidene bisphenol (bisphenol Z), 4,4′-sulfonyl bisphenol (bisphenol S); alkylene oxide adducts of the above bisphenols; hydroquinone , Aromatic dihydroxy compounds such as resorcin, 4,4′-dihydroxybiphenyl, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxydiphenylbenzophenone; Alkylene oxide adducts of hydroxy compounds can be exemplified. Ethylene glycol, diethylene glycol, trimethylene glycol, 1,4-butanediol, and 1,4-cyclohexanedimethanol are preferable from the viewpoint of mechanical performance and economical efficiency of the polyester resin (A) of the present invention, and ethylene glycol is particularly preferable. . The exemplified diol units can be used alone or in combination.

  Further, the dicarboxylic acid unit used in the polyester resin (A) of the present invention is not particularly limited, but succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, Aliphatic dicarboxylic acids such as cyclohexanedicarboxylic acid, decanedicarboxylic acid, norbornanedicarboxylic acid, tricyclodecanedicarboxylic acid, pentacyclododecanedicarboxylic acid; terephthalic acid, isophthalic acid, phthalic acid, 2-methylterephthalic acid, 1,4-naphthalene Examples include aromatic dicarboxylic acids such as dicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, and tetralindicarboxylic acid. From the viewpoint of mechanical performance and heat resistance of the polyester resin (A) of the present invention, terephthalic acid, isophthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid and 2 Aromatic dicarboxylic acids such as 1,7-naphthalenedicarboxylic acid are preferred, and terephthalic acid, 2,6-naphthalenedicarboxylic acid, and isophthalic acid are particularly preferred. Among these, terephthalic acid is most preferable from the viewpoint of economy. The illustrated dicarboxylic acids can be used alone or in combination.

The melt viscosity of the polyester resin (A) of the present invention is preferably in the range of 700 to 5000 Pa · s when measured at a measurement temperature of 240 ° C. and a shear rate of 100 s ⁻¹ . When the melt viscosity is in the above range, the moldability is excellent.

For reference, first, the layer structure of a conventional PETG card will be described. A white PETG core sheet having a thickness of about 0.28 mm is used as a core material, and a thickness of about 0.10 mm is used as an oversheet. A transparent PETG sheet is used.
Two core sheets are used because the card has front and back side printing, and if one is used, loss usually increases, so double-sided printing is not adopted or the number of printed colors on the front and back sides is different. Although it is reasonable to print two sheets separately on the front and back sides, it is of course possible to print on both sides of a single core sheet. Alternatively, the core sheet and a laminate of an oversheet printed with a concealing layer, a picture layer, and OP varnish may be stacked together and sandwiched between mirror plates and hot pressed.

  When the card of the present invention is embossed with characters on the surface, the embossed curl is stipulated by JIS X6301: 1998, “When the embossed card before distribution is placed on the surface plate with the convex side of the embossed card facing upward, The maximum value up to any unembossed portion of the surface on the convex side must not exceed 2.5 mm including the thickness of the card can be easily satisfied. When there are few embossed lines, the conventional PVC card satisfies this standard, but with a 4-line embossed PETG card, it is about 2.4 mm. At the beginning of embossing, the standard value is satisfied, but curling may increase when performing a heat resistance test.

  The structure of the card of the present invention is preferably a polyester resin (A) containing a diol unit having a cyclic acetal skeleton as described above for both the core sheet and the oversheet, but is not limited to this structure.

  For the core sheet used in the present invention, the above-described polyester resin (A) containing a diol unit having a cyclic acetal skeleton, conventional PETG, and further a blend resin of PETG and PC can be used. It is preferable that a white inorganic pigment is added to these sheets in an amount of 5% by weight or more. This is because if the addition amount is less than 5% by weight, the light transmission density of the card stipulated by the JIS standard cannot be satisfied. The upper limit of the additive concentration is not particularly limited, but if the additive concentration is too high, the physical properties and workability of the sheet are lowered, and therefore the upper limit is approximately 30% by weight.

  The light transmission density of the card is preferably such that the Macbeth density measured with a Macbeth densitometer is in the range of 1.0 to 5.0. More preferably, it is 1.5-4.0, Most preferably, it is the range of 2.0-3.0. When the Macbeth concentration is lower than 1.0, sufficient concealability cannot be obtained, and when it is higher than 5.0, the amount of white inorganic pigment is too much, and the sheet physical properties and processability are deteriorated as described above. Moreover, there is also a drawback that aggregates are deposited on the sheet surface due to the high concentration of the white inorganic pigment.

  As the oversheet used in the present invention, a sheet made of the above-described polyester resin (A) containing a diol unit having a cyclic acetal skeleton can be used, and a conventional PETG sheet alone or PETG / PC / PETG 3 A material having a layer structure can also be used.

  When these oversheets are used, they can be heat-sealed with the core sheet at relatively low temperature conditions (90 ° C. to 120 ° C.), and the printed pattern does not distort during hot pressing, and fluidizes during pressing. This is because there is no “air trap mark”. The layer thickness of the three-layer structure of PETG / PC / PETG is preferably about 1: 2: 1. This is because if the PC is thinner than this, the heat resistance is lowered, and if the PC is thicker, the embedding property of the magnetic tape is lowered.

  For the core sheet and / or oversheet used in the present invention, a resin obtained by blending the above-described polyester resin (A) containing a diol unit having a cyclic acetal skeleton with another resin may be used. Other resins include, but are not limited to, PC, PETG, isophthalic acid modified PET, PET, PEN, polyarylate, polystyrene, acrylic resin, polymethyl methacrylate-styrene resin, acrylonitrile-butadiene-styrene resin Vinyl chloride resin and alicyclic polyolefin resin. Among these, it is preferable to use PC from the viewpoint of compatibility with the polyester resin (A) containing a diol unit having a cyclic acetal skeleton, transparency, heat resistance, and the like. The ratio of the polyester resin (A) containing a diol unit having a cyclic acetal skeleton in the core sheet and / or oversheet is not particularly limited, but is preferably 30% by weight or more, more preferably 35% by weight or more, most preferably Preferably it is 40 weight% or more. When the amount of the polyester resin (A) is less than 30% by weight, heat resistance, moldability, transparency, and mechanical properties are deteriorated, and it is difficult to achieve both of them.

  The card of the present invention is not particularly limited, but the core sheet and the oversheet can be heat-sealed at a relatively low temperature as described above, and an adhesive or an adhesive sheet / film is used. It is also possible to bond them together. The thickness composition ratio can be arbitrarily selected, but the total thickness of the core sheet: the total thickness of the oversheet is 95: 5 to 50:50, preferably 90:10 to 55:45, and more preferably 80: It is in the range of 20-60-40.

  Examples of the method for forming the core sheet and / or oversheet used in the present invention include a melt extrusion method and a solution casting method. In the present invention, the method may be appropriately selected from the balance between economic efficiency and film performance. That's fine. Of these, the melt extrusion method is preferably used.

  Examples of the melt extrusion method include a T-die extrusion method and an inflation method, and the T-die extrusion method is preferable. As an apparatus for melting the resin, a generally used extruder may be used, and a single-screw extruder or a multi-screw extruder may be used. The extruder may have one or more vents, and may remove moisture, low-molecular substances, etc. from the molten resin by reducing the vents. Moreover, you may provide a metal-mesh filter, a sintered filter, and a gear pump as needed at the front-end | tip or downstream side of an extruder. As the die, a T die, a coat hanger die, a fish tail die, a stack plate die, or the like can be used.

  The extrusion temperature is preferably 200 to 300 ° C, more preferably 210 to 280 ° C, and particularly preferably 220 to 270 ° C. When the extrusion temperature is in the above range, a sheet having an excellent balance of smoothness and mechanical properties can be obtained.

  A known method can be used for cooling the molten resin extruded from the die. In general, it can be cooled by a cooling drum. Since the polyester resin (A) used in the present invention is a substantially amorphous resin, the temperature of the cooling drum can be set widely. In order to obtain a sheet having excellent smoothness, the temperature of the cooling drum is preferably 30 ° C. above and below the glass transition temperature of the resin, more preferably 20 ° C. above and below the glass transition temperature of the resin, and particularly preferably glass of the resin. 10 ° C. above and below the transition temperature. In order to obtain a sheet with good smoothness and thickness accuracy, it is preferable to control the discharge speed, the take-up speed, and the temperature of the cooling drum according to the apparatus.

  The card of the present invention contains additives usually used as desired, for example, stabilizers, lubricants, plasticizers, matting agents, drying regulators, anti-settling agents, surfactants, flow improvers, drying oils, waxes. , Colorants, complementary colorants, surface smoothing agents, curing accelerators, reinforcing agents, processing aids, pigments, antistatic agents, antioxidants, neutralizing agents, UV absorbers, light stabilizers, dispersants, thickeners Agent, other inorganic fillers, etc., or polyolefin, polyester, polyamide, polycarbonate, acrylonitrile resin, vinyl chloride resin, vinyl acetate resin, polyacrylic acid, polymethacrylic acid, polystyrene, ABS resin, polyimide, AS resin, oligomer, etc. Can also be added.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by these examples.

The main raw materials used in the examples and comparative examples are shown below.
-PETG: manufactured by Eastman Chemical Co., Ltd., trade name: PETG6763
・ Polyethylene terephthalate (PET): manufactured by Nihon Unipet Co., Ltd., trade name: UNIPET RT553C
Polycarbonate (PC): manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name: Iupilon H-3000
Blend resin (B): The following polyester resin (A1) and PC were dry blended at 80:20 (weight ratio), melt-kneaded by a twin screw extruder, and pelletized (blend resin (B)).
Blend resin (C): The following polyester resin (A1) and PC were dry blended at 50:50 (weight ratio), melt-kneaded by a twin screw extruder, and pelletized (blend resin (C)).
Blend resin (D): The following polyester resin (A1) and PC were dry blended at 30:70 (weight ratio), melt-kneaded by a twin screw extruder, and pelletized (blend resin (D)).
Blend resin (E): PETG and PC were dry blended at 60:40 (weight ratio), melt-kneaded with a twin screw extruder, and pelletized (blend resin (E))

[Production of polyester resins (A1) and (A2)]
Charged terephthalic acid and ethylene glycol in the amounts shown in Table 1 into a 150 liter polyester resin production system equipped with a packed column rectification column, a partial condenser, a full condenser, a cold trap, a stirrer, a superheater, and a nitrogen introduction pipe The esterification reaction was carried out by a conventional method. Ethylene glycol for depolymerization and germanium dioxide in the amounts shown in Table 1 were added to the obtained ester, and depolymerization was performed at 225 ° C. under a nitrogen stream. After reacting for 3 hours while distilling off the water produced, ethylene glycol was distilled off at 215 ° C. and 13.3 kPa. Tetra-n-butyl titanate, potassium acetate, triethyl phosphate, and SPG described in Table 1 were added to the obtained ester, and the reaction was performed at 225 ° C. and 13.3 kPa for 3 hours. The resulting ester was heated and depressurized, and finally subjected to a polycondensation reaction at 270 ° C. and high vacuum (300 Pa or less), and when the predetermined melt viscosity was reached, the reaction was terminated and the polyester resin (A1), ( A2) was obtained.
In addition, the meaning of the abbreviation in a table | surface is as follows.
PTA: terephthalic acid SPG: 3,9-bis (1,1-dimethyl-2-hydroxyethethyl) -2,4,8,10-tetraoxaspiro [5.5] undecane EG: ethylene glycol GeO2: Germanium dioxide, TBT: Tetra-n-butyl titanate, AcOK: Potassium acetate, TEP: Triethyl phosphate

The evaluation methods of the polyester resins (A1) and (A2) are as follows.
(1) Ratio of diol units having a cyclic acetal skeleton The ratio of diol units having a cyclic acetal skeleton in a polyester resin is calculated from ¹ H-NMR measurement and peak area ratio by dissolving 20 mg of a polyester resin in 1 g of heavy chloroform. did. The measuring apparatus used JNM-AL400 by JEOL Co., Ltd., and measured it at 400 MHz.
(2) Glass transition temperature The glass transition temperature of the polyester resin is DSC / TA-50WS manufactured by Shimadzu Corporation. About 10 mg of a sample is placed in an aluminum non-sealed container, and the temperature rising rate in a nitrogen gas (30 ml / min) airflow is 20 The glass transition temperature was measured at a temperature of ° C / min and the temperature changed by ½ of the difference in baseline before and after the transition of the DSC curve.
(3) Molecular weight (number average molecular weight Mn, weight average molecular weight Mw, molecular weight distribution Mw / Mn)
Polyester resin (2 mg) was dissolved in 20 g of chloroform, measured by gel permeation chromatography (GPC), and calibrated with standard polystyrene as Mn and Mw / Mn. GPC was measured by connecting TOSOH 8020 manufactured by Tosoh Corporation with two columns GMHHR-L manufactured by Tosoh Corporation and one TSK G5000HR and measuring the column temperature at 40 ° C. As an eluent, chloroform was flowed at a flow rate of 1.0 ml / mn, and measurement was performed with a UV detector.
(4) Melt viscosity Measured using Capirograph 1C (Capillograph) manufactured by Toyo Seiki, temperature: 240 ° C., preheating time: 1 min, nozzle diameter: 1 mm, nozzle length: 10 mm, shear rate: 100 (1 / sec) Went.

[Sheet Manufacturing Method]
Polyester resin (A1), blend resin (B), (C), (D), PETG, and 100 parts by weight of PETG are each dry blended with 10 parts by weight of titanium oxide and a T-die extrusion method using a 65 mm extruder. A core sheet having a thickness of 0.3 mm or 0.5 mm was prepared. Similarly, an oversheet having a thickness of 0.1 mm or 0.15 mm was produced using polyester resins (A1), (A2), PETG, and blend resin (E).

[Production of card]
Two sheets of core sheets are stacked on top and bottom, one on each of the front and back sides, and pressed using a press machine at 110 ° C., 10 kgf / cm ² , and a heating time of 10 minutes. Were integrated by thermal fusion to produce a card-structured sheet. Further, a punched card was formed to a predetermined card size (85.6 mm × 54.0 mm).

〔Evaluation method〕
Next, the evaluation method of the multilayer sheet in a present Example and a comparative example is as follows.
(1) Embossing Four-line character embossing was performed on the card using a manual embosser. The amount of warping (mm) of the card was measured according to JIS X6301, and the engraved characters were magnified 20 times with a stereomicroscope to observe the presence or absence of character cracks.
○: No character cracking Δ: Partial character cracking occurred but usable level ×: Character cracking occurred (2) After pressing the fusion-bonding oversheet and core sheet at 110 ° C. for 10 minutes A cut was made and it was confirmed whether or not the two sheets were peeled off.
○: The sheet is completely fused and peeling does not occur. Δ: The sheet is partially peeled but usable level. X: The sheet is completely peeled. (3) Heat resistance 70 ° C. I leaned the card against the dryer and checked if the card bent.
○: Not bent Δ: Slightly bent but usable level ×: Completely bent (4) Measurement was performed in accordance with JIS K6734 using a flexible temperature card.
(5) The Macbeth concentration of the Macbeth concentration card was measured using a Macbeth concentration meter (model TR-924) manufactured by Macbeth.

[Examples 1-7, Comparative Examples 1-3]
The evaluation results are shown in Tables 2, 3, and 4.

  The card of the present invention is excellent in heat resistance and embossability, and is used for various cards such as cash cards, credit cards, ID cards, etc., especially applications requiring heat resistance (for example, in-vehicle ETC cards). The industrial significance of the present invention is great.

Claims (7)

It is an embossing card having at least an oversheet layer and a core sheet layer, and at least one layer selected from the oversheet layer and the core sheet layer is composed of a resin layer containing the following polyester resin (A), and is measured by a Macbeth densitometer. A card characterized by having a Macbeth concentration of 1.0 to 5.0.
Polyester resin (A): a polyester resin having a dicarboxylic acid structural unit and a diol structural unit, wherein at least 10 to 60 mol% of the diol structural unit is represented by the following formula (1) or (2) A polyester resin which is a unit derived from a diol having a skeleton.

(In the formula, R ¹ and R ² are each independently an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, and 6 to 10 carbon atoms. Represents a hydrocarbon group selected from the group consisting of aromatic hydrocarbon groups.)

(In the formula, R ¹ is the same as above, R ³ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, and 6 to 10 carbon atoms. Represents a hydrocarbon group selected from the group consisting of aromatic hydrocarbon groups of The card according to claim 1, wherein the ratio of the total thickness of the core sheet layer and the total thickness of the oversheet layer is 95: 5 to 50:50. The card according to claim 1 or 2, wherein the glass transition temperature of the polyester resin (A) is 80 ° C or higher. 4. The card according to claim 1, wherein the melt viscosity of the polyester resin (A) when measured at a measurement temperature of 240 ° C. and a shear rate of 100 s ^{−1 is} in the range of 700 to 5000 Pa · s. A diol unit having the cyclic acetal skeleton derived from 3,9-bis (1,1-dimethyl-2-hydroxyethyl) -2,4,8,10-tetraoxaspiro [5.5] undecane, 5. The card according to claim 1, which is a diol unit derived from 5-methylol-5-ethyl-2- (1,1-dimethyl-2-hydroxyethyl) -1,3-dioxane. Diol unit other than the diol unit having a cyclic acetal skeleton, derived et Ji glycol, diethylene glycol, trimethylene glycol, one or more diols selected from the group consisting of 1,4-butanediol and 1,4-cyclohexanedimethanol The card according to claim 1, wherein the card is a diol unit. The dicarboxylic acid units, terephthalic acid, isophthalic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, at least one member selected from 2,6-naphthalenedicarboxylic acid and 2,7-naphthalene dicarboxylic acid The card according to any one of claims 1 to 6, wherein the card is a dicarboxylic acid unit derived from a dicarboxylic acid.