Resin composition for security cards, sheet for security cards, multilayer body, and security cards

Abstract

Provided are: a resin composition capable of providing sheets which have excellent lamination performance and give multilayered objects having excellent resistance to bending and which have excellent laser markability; and a security-card sheet obtained using the resin composition, a multilayered object, and a security card. The resin composition for security cards includes a polycarbonate resin having a terminal structure represented by formula (1). In formula (1), R1 represents a C8-C36 alkyl group or a C8-C36 alkenyl group; the R2 moieties each independently represent a halogen atom, a C1-C20 alkyl group, or a C6-C12 aryl group; n indicates an integer of 0-4; and symbol * is a site of combining with the polycarbonate resin.

Description

[Technical Field]

[0001] The present invention relates to a resin composition for security cards, a sheet for security cards, a multilayer body, and a security card. [Background technology]

[0002] BACKGROUND ART Security cards containing resin films or multilayer bodies thereof have begun to be used in ID cards, e-passports, contactless IC cards, and the like. Security cards are known to have layers such as an overlay layer, a white core layer that incorporates a chip, and a laser marking layer on which information is written, and polycarbonate resin is being considered as the resin that constitutes these layers (Patent Document 1). Here, polycarbonate resin is desirable because it has excellent bending resistance and excellent laser marking properties, etc. However, since security cards often have multiple layers laminated together as described above, lamination performance is required. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2010-516519 Summary of the Invention [Problem to be solved by the invention]

[0004] As a means of improving the lamination performance of polycarbonate resin, the addition of polycaprolactone or PCTG (a polyester in which part of the ethylene glycol, a raw material for polyethylene terephthalate (PET), is replaced with cyclohexanedimethanol) has been investigated. However, it has been found that while the addition of these compounds improves lamination performance, it also results in poor bending resistance. It has also been found that laser marking performance is also poor. The present invention solves these problems and aims to provide a resin composition that can provide a sheet that has excellent lamination performance, excellent bending resistance when made into a multilayer body, and excellent laser marking properties, as well as a security card sheet, a multilayer body, and a security card that use the resin composition. [Means for solving the problem]

[0005] The above-mentioned problems have been solved by employing a polycarbonate resin having a predetermined terminal structure. Specifically, the above-mentioned problems have been solved by the following means. <1> A resin composition for security cards, comprising a polycarbonate resin having a terminal structure represented by the following formula (1): Formula (1) [ka] (In formula (1), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, and R 2 each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents an integer of 0 to 4. * represents a bonding site with the polycarbonate resin. <2> The glass transition temperature of the resin composition measured by a differential scanning calorimeter is 115°C to 135°C. <1> The resin composition according to claim 1. <3> The Q value, which indicates the melt fluidity of the resin composition, is 1 to 20. <1> or <2> The resin composition according to claim 1. <4> The viscosity average molecular weight of the polycarbonate resin is 18,000 to 40,000. <1> ~ <3> The resin composition according to any one of the above. <5> Further, the present invention includes a black pigment. <1> ~ <4> The resin composition according to any one of the above. <6> Further, the composition contains a white pigment. <1> ~ <4> The resin composition according to any one of the above. <7> Further, the resin composition contains a blue dye in an amount of 10 to 100 ppm by mass. <6> The resin composition according to claim 1. <8> Further comprising an antistatic agent, <1> ~ <7> The resin composition according to any one of the above. <9> <1> ~ <8> 10. A security card sheet formed from the resin composition according to any one of claims 1 to 9. <10> The thickness is 20 μm to 400 μm. <9> The sheet described in <11> Surface roughness Ra is 0.8 μm to 3.0 μm. <9> or <10> The sheet described in <12> <1> ~ <8> A sheet formed from the resin composition according to any one of the above items, and <9> ~ <11> A multilayer body comprising at least one sheet according to any one of the preceding claims. <13> At least two sheets, each of the at least two sheets independently comprising: <1> ~ <8> A multilayer body which is a sheet formed from the resin composition according to any one of the above items. <14> <1> ~ <8> A sheet formed from the resin composition according to any one of the above items, and <9> ~ <11> A security card comprising at least one of the sheets described in any one of the above. <15> <12> or <13> A security card comprising at least one of the multilayer bodies described above. <16> At least one of the outermost sheets among the sheets constituting the security card has a thickness of 20 μm to 400 μm. <15> The security card described in <17> At least one of the sheets constituting the security card other than the outermost sheet is <5> A sheet formed from the resin composition according to claim 1. <15> or <16> The security card described in <18> At least one of the sheets constituting the security card other than the outermost sheet is <6> A sheet formed from the resin composition according to claim 1. <15> ~ <17> A security card described in any one of the above. <19> At least one of the sheets constituting the security card is <5> A sheet formed from the resin composition according to claim 1, wherein at least one of the other components is <6> and a sheet formed from the resin composition according to claim 1, wherein at least one other <1> ~ <4> A sheet formed from the resin composition according to any one of the above, which does not contain a black pigment or a white pigment. <15> ~ <18> A security card described in any one of the above. <20> The security card is used for any of a My Number card, a driver's license, a health insurance card, and a passport. <15> ~ <19> A security card described in any one of the above. [Effects of the Invention]

[0006] It is now possible to provide a resin composition that can provide a sheet that has excellent lamination performance, excellent bending resistance when made into a multilayer body, and excellent laser marking properties, as well as a security card sheet, a multilayer body, and a security card that use the resin composition. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view showing an example of a security card of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing the layer structure of the multilayer body produced in the example. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only this embodiment. In this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit. In this specification, various physical properties and characteristic values ​​are those at 23°C unless otherwise specified. In the description of groups (atomic groups) in this specification, when a notation does not specify whether they are substituted or unsubstituted, it includes both groups (atomic groups) that have no substituents and groups (atomic groups) that have substituents. For example, the term "alkyl group" includes not only alkyl groups that have no substituents (unsubstituted alkyl groups) but also alkyl groups that have substituents (substituted alkyl groups). In this specification, when a notation does not specify whether they are substituted or unsubstituted, it is preferable that they be unsubstituted. The multilayer bodies in this specification are intended to include those in the form of a sheet. The term "sheet" refers to a generally flat shaped body having a small thickness relative to its length and width. In this specification, "parts by mass" indicates the relative amount of a component, and "% by mass" indicates the absolute amount of a component. In cases where the standards shown in this specification differ depending on the year and the measurement method, etc., the standards shall be based on the standards in effect at the time of filing unless otherwise stated.

[0009] The resin composition for security cards of this embodiment (hereinafter, sometimes simply referred to as "resin composition") is characterized by containing a polycarbonate resin having a terminal structure represented by formula (1). Formula (1) [ka] (In formula (1), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, and R 2 each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents an integer of 0 to 4. * represents a bonding site with the polycarbonate resin. This configuration makes it possible to provide a security card sheet that has high lamination performance, excellent bending resistance when formed into a multilayer body, and excellent laser marking performance. Here, lamination performance refers to the ease with which single-layer sheets can be laminated and integrated, and if lamination is possible at a lower temperature, it can be said that the lamination performance has been improved. In this embodiment, it is believed that the glass transition temperature (Tg) of the polycarbonate resin can be lowered by adopting a specific terminal structure for the polycarbonate resin. More specifically, it is believed that the long-chain alkyl groups in the terminal structures of the polycarbonate resin interact with each other, thereby lowering the glass transition temperature of the polycarbonate resin. It is also believed that the incorporation of an ester structure into the terminal structure lowers the glass transition temperature of the polycarbonate resin. As a result, it is believed that the lamination performance can be improved without blending an additive such as caprolactone into the polycarbonate resin. While simply reducing the molecular weight would be an option to lower the glass transition temperature of the polycarbonate resin, this would result in poor bending resistance. In this embodiment, it is believed that the adoption of a polycarbonate resin with a specific terminal structure makes it possible to provide a security card sheet that has high lamination performance, excellent bending resistance when formed into a multilayer body, and excellent laser marking performance, even without reducing the molecular weight.

[0010] <Polycarbonate resin> The resin composition of the present embodiment contains a polycarbonate resin having a terminal structure represented by formula (1). Formula (1) [ka] (In formula (1), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, and R 2 each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents an integer of 0 to 4. * represents a bonding site with the polycarbonate resin. It is believed that the use of such polycarbonate resins has made it possible to provide a sheet for security cards that has high lamination performance, excellent bending resistance when made into a multilayer body, and excellent laser marking performance.

[0011] The polycarbonate resin is not particularly limited as long as it contains an -[OR-OCO]- unit containing a carbonate bond in the molecular main chain (where R is an aliphatic group, an aromatic group, or both an aliphatic group and an aromatic group, and further has a linear or branched structure). However, aromatic polycarbonate resins are more preferred in terms of impact resistance and heat resistance, stability as an aromatic dihydroxy compound, and ease of availability of polycarbonate resins containing small amounts of impurities. Examples of aromatic polycarbonate resins include bisphenol A polycarbonate resins. Examples of bisphenol A polycarbonate resins include polycarbonate resins in which 80 mol % or more of the total structural units are structural units containing a structure derived from bisphenol A.

[0012] Next, the terminal structure shown in formula (1) will be described. Formula (1) [ka] (In formula (1), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, and R 2 each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents an integer of 0 to 4. * represents a bonding site with the polycarbonate resin.

[0013] In formula (1), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, and is preferably an alkyl group having 8 to 36 carbon atoms. The number of carbon atoms in the alkyl group or alkenyl group is preferably 10 or more, more preferably 12 or more, and even more preferably 14 or more. By making the number equal to or greater than the lower limit, the glass transition temperature of the polycarbonate resin decreases, and lamination performance tends to be further improved. The number of carbon atoms in the alkyl or alkenyl group is preferably 32 or less, more preferably 28 or less, even more preferably 24 or less, and even more preferably 20 or less. By making the number of carbon atoms equal to or less than the upper limit, it is possible to effectively prevent a decrease in the strength and heat resistance of the polycarbonate resin. In formula (1), R 2 each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms. The halogen atom is preferably a fluorine atom, a chlorine atom, or a bromine atom, and more preferably a fluorine atom. The alkyl group having 1 to 20 carbon atoms is preferably an alkyl group having 1 to 10 carbon atoms, more preferably an alkyl group having 1 to 5 carbon atoms, and even more preferably a methyl group or an ethyl group. The aryl group having 6 to 12 carbon atoms is preferably a phenyl group. In formula (1), n ​​represents an integer of 0 to 4, preferably an integer of 0 to 3, more preferably an integer of 0 to 2, even more preferably 0 or 1, and even more preferably 0. The terminal structure represented by formula (1) is preferably represented by the following formula (2). Formula (2) [ka] (In formula (2), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms. R in Equation (2) 1 is R in Eq. (1) 1 The same applies to the preferred range.

[0014] The polycarbonate resin used in this embodiment may or may not have a terminal structure other than the terminal structure represented by formula (1). Examples of the terminal structure other than the terminal structure represented by formula (1) include a hydroxyl group and a phenoxy group, and a p-tert-butylphenoxy group is particularly preferred. In this embodiment, it is preferred that 90 mol % or more (preferably 95 mol % or more) of the terminals of the polycarbonate resin are the terminal structure represented by formula (1) or a hydroxyl group, and it is more preferred that 90 mol % or more (preferably 95 mol % or more) of the terminals of the polycarbonate resin are the terminal structure represented by formula (1). The polycarbonate resin used in this embodiment may have only one type of terminal structure represented by formula (1), or may have two or more types. Examples of terminal structures other than those mentioned above include terminal structures formed by terminal blocking agents described in paragraph 0030 of Japanese Patent No. 6563411, the contents of which are incorporated herein by reference.

[0015] The method for producing polycarbonate is not particularly limited, and any method can be used, including, for example, interfacial polymerization, melt transesterification, pyridine method, ring-opening polymerization of a cyclic carbonate compound, and solid-phase transesterification of a prepolymer. The above terminal structure can be formed by adding a phenol represented by the following formula (3) during synthesis of the polycarbonate resin. Formula (3) [ka] (In formula (3), R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, and R 2 each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents an integer of 0 to 4. R in Equation (3) 1 , R 2 and n are R in formula (1), respectively. 1 , R 2 and n have the same meanings and preferred ranges.

[0016] The molecular weight of the polycarbonate resin is preferably 18,000 or more, more preferably 20,000 or more, and even more preferably 22,000 or more, in terms of viscosity average molecular weight calculated from the solution viscosity measured at 25°C using methylene chloride as a solvent. It is also preferably 40,000 or less, more preferably 33,000 or less, even more preferably 31,000 or less, and may even be 30,000 or less. By setting the viscosity average molecular weight to the above lower limit or more, the mechanical strength of the resulting sheet film can be further improved. By setting the viscosity average molecular weight to the above upper limit or less, the decrease in resin fluidity can be suppressed and improved, and molding processability tends to be improved. Two or more polycarbonate resins having different viscosity-average molecular weights may be mixed together. In this case, polycarbonate resins having a viscosity-average molecular weight outside the preferred range may be mixed together to adjust the viscosity-average molecular weight within the range. The viscosity average molecular weight [Mv] is calculated by using methylene chloride as a solvent and an Ubbelohde viscometer to determine the intrinsic viscosity [η] (unit: dL / g) at a temperature of 25°C, and then calculating it using the Schnell viscosity formula, i.e., η = 1.23 × 10 -4 Mv 0.83 The intrinsic viscosity [η] is the specific viscosity [η] at each solution concentration [C] (g / dL). sp ] was measured and the value was calculated according to the following formula.

number

[0017] The glass transition temperature of the polycarbonate resin used in this embodiment is preferably 115°C or higher, more preferably 117°C or higher, and even more preferably 119°C or higher. By setting the glass transition temperature at or above the lower limit, the heat resistance of the resulting sheet tends to be further improved. Furthermore, the glass transition temperature of the polycarbonate resin used in this embodiment, as measured with a differential scanning calorimeter, is preferably 135°C or lower, more preferably 133°C or lower, even more preferably 131°C or lower, and may be 130°C or lower. By setting the glass transition temperature at or below the upper limit, the lamination performance tends to be further improved. The glass transition temperature is measured as described in the Examples section below.

[0018] The resin composition of this embodiment preferably contains 70% by mass or more, more preferably 80% by mass or more, and even more preferably 85% by mass or more of a polycarbonate resin (including a polycarbonate resin having no terminal structure represented by formula (1)). The upper limit of the content of the polycarbonate resin is, for example, 100% by mass.

[0019] <Coloring agent> The resin composition of the present embodiment may or may not contain a colorant. By containing a colorant, the resin composition can be preferably used as a laser marking layer or a white core layer of a security card. The resin composition of this embodiment containing a colorant will be described below.

[0020] An example of the resin composition of this embodiment that contains a colorant is a resin composition that further contains a black pigment. By including the black pigment, the resin composition can be preferably used as a laser marking layer for security cards. The black pigment may be at least one selected from the group consisting of carbon black, titanium black, metal oxides, metal sulfides, and metal nitrides, with carbon black being preferred. The content of the black pigment is preferably 0.0005 parts by mass or more, more preferably 0.001 parts by mass or more, and even more preferably 0.005 parts by mass or more, relative to 100 parts by mass of the polycarbonate resin, and the upper limit is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 1 part by mass or less. The black pigment may be used alone or in combination of two or more. When two or more types are used, the total amount is preferably within the above range. The black pigment preferably has an average primary particle size of 30 to 80 nm. The lower limit of the average primary particle size of the black pigment is more preferably 40 nm. The upper limit is more preferably 75 nm, and even more preferably 70 nm. Thus, a resin composition containing a black pigment having an average primary particle size within the above-mentioned range has high laser marking properties and excellent color tone.

[0021] Another example of the resin composition of this embodiment that contains a colorant is a resin composition that further contains a white pigment. By including a white pigment, the resin composition can be preferably used as a white core layer of a security card. The white pigment may be at least one selected from the group consisting of titanium oxide, talc, calcium carbonate, barium sulfate, zirconium oxide, and barium titanate, with titanium oxide being preferred. The content of the white pigment is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, even more preferably 1 part by mass or more, and may be 8 parts by mass or more, relative to 100 parts by mass of the polycarbonate resin. The upper limit is preferably 40 parts by mass or less, more preferably 35 parts by mass or less, and even more preferably 30 parts by mass or less. By making the content equal to or greater than the lower limit, the concealment properties of the security card tend to be further improved. The white pigment may be used alone or in combination of two or more. When two or more types are used, the total amount is preferably within the above range. The lower limit of the average primary particle size of the white pigment is preferably 100 nm or more, more preferably 150 nm or more. The upper limit is preferably 400 nm or less, more preferably 350 nm or less. A resin composition for security cards containing a white pigment having an average primary particle size within the above-mentioned range has excellent hiding power. The white pigment is preferably surface-treated, and examples thereof include at least one treatment selected from the group consisting of Al2O3 treatment, siloxane treatment, and silica treatment. Surface treatment tends to suppress the aggregation of titanium oxide and effectively suppress the decomposition of polycarbonate resin. Only one type of surface treatment agent may be used, or two or more types may be used.

[0022] The resin composition of this embodiment may also contain a dye. In particular, it is preferable that the resin composition of this embodiment containing a white pigment contains a dye. This configuration tends to further improve hiding power. Examples of the dye include blue dyes, red dyes, yellow dyes, and green dyes, with blue dyes being preferred. When the resin composition of this embodiment contains a dye, it is preferable that the dye be contained in an amount of 10 to 100 ppm, and more preferably 30 to 70 ppm, based on the mass of the resin composition. That is, a preferred example of the resin composition of this embodiment containing a white pigment is one in which the blue dye is contained in an amount of 10 to 100 ppm by mass based on the resin composition.

[0023] In the resin composition of this embodiment, the total amount of the polycarbonate resin (including the polycarbonate resin having no terminal structure represented by formula (1)) and the colorant preferably accounts for 90% by mass or more of the resin composition, more preferably 95% by mass or more, and even more preferably 98% by mass or more. The upper limit of the total amount of the polycarbonate resin and the colorant is, for example, 100% by mass.

[0024] <Antistatic agent> The resin composition of this embodiment may contain an antistatic agent. The type of antistatic agent is not particularly limited, but an example is a compound represented by the following formula (4): [(R 1 )3R 2 P] + ·(R 3 SO2)(R 4 SO2)N - (4) In formula (1), R 1 and R 2 each independently represents an alkyl group having 5 or more carbon atoms, and R 3 and R 4 each independently represents a perfluoroalkyl group having 1 to 4 carbon atoms. The compound represented by formula (4) is liquid under normal use conditions (for example, at 25° C.), and therefore can be dispersed well in polycarbonate resin.

[0025] In formula (4), R 1 and R 2 are each independently an alkyl group having 5 or more carbon atoms, and preferably an alkyl group having 6 or more carbon atoms. There is no particular upper limit on the number of carbon atoms in the alkyl group, but it is, for example, 20 or less, and preferably 16 or less. R 1 and R 2 Also, R 1 At least one of and R 2 and R are preferably alkyl groups having different carbon numbers, 1 At least one of and R 2 and R preferably have a difference of 3 or more in the number of carbon atoms. 1 At least one of and R 2 It is more preferable that the difference in carbon number be 5 or more. There is no particular upper limit to the difference in carbon number, but for example, the difference may be 12 or less. By adopting such a configuration, the compound represented by formula (4) tends to be less likely to crystallize, and dispersibility tends to be further improved. More specifically, the occurrence of non-uniform portions (poorly dispersed portions) called clumps can be prevented. As a result, the standard deviation (variation) of the antistatic performance of the resin composition can be reduced. Also, the three R's 1 may be the same or different groups. In one embodiment, three R 1are the same group. Furthermore, R 1 is an alkyl group having 6 to 9 carbon atoms, and R 2 is preferably a linear alkyl group having 10 to 16 carbon atoms, and R 1 is an alkyl group having 6 to 8 carbon atoms, and R 2 is preferably a linear alkyl group having 12 to 15 carbon atoms. R 1 The alkyl group as R is preferably a pentyl group, a hexyl group, a heptyl group, an octyl group, or a nonyl group. 2 The alkyl group as (I) is preferably a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, or a hexadecyl group. Examples of the pentyl group include an n-pentyl group, an i-pentyl group, and a sec-pentyl group, with an n-pentyl group being preferred. The same applies to a hexyl group.

[0026] In formula (4), R 3 and R 4 R each independently represents a perfluoroalkyl group having 1 to 4 carbon atoms, preferably a perfluoroalkyl group having 1 or 2 carbon atoms, and more preferably a trifluoromethyl group. 3 and R 4 may be the same or different groups. 3 and R 4 are the same group.

[0027] In equation (4), R 1 is an alkyl group having 6 to 9 carbon atoms, and R 2 is a linear alkyl group having 10 to 16 carbon atoms, and R 3 and R 4 Preferably, each independently represents a perfluoroalkyl group having 1 or 2 carbon atoms.

[0028] The lower limit of the molecular weight of the compound represented by formula (4) is preferably 660 or more, more preferably 680 or more, even more preferably 700 or more, still more preferably 730 or more, and still more preferably 750 or more. The upper limit of the molecular weight of the compound represented by formula (4) may be, for example, 1000 or less, 900 or less, or 800 or less.

[0029] The content of the antistatic agent in the resin composition is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and may be 0.5% by mass or more, particularly 0.6% by mass or more, with the upper limit being, for example, 3.0% by mass or less. The antistatic agent may be contained in only one kind or in two or more kinds. When two or more kinds are contained, it is preferable that the total amount is in the above range. A resin composition for security cards containing an antistatic agent in the above-mentioned predetermined range has excellent antistatic performance.

[0030] <Antioxidants> The resin composition of the present embodiment preferably contains an antioxidant. Examples of antioxidants include phenol-based antioxidants, amine-based antioxidants, phosphorus-based antioxidants, thioether-based antioxidants, etc. Among these, in the present embodiment, phosphorus-based antioxidants and phenol-based antioxidants (more preferably hindered phenol-based antioxidants) are preferred, and phosphorus-based antioxidants are particularly preferred.

[0031] The phosphorus-based antioxidant is preferably a phosphite-based antioxidant, and a phosphite compound represented by the following formula (A) or (B) is preferred. [ka] (In formula (A), R 11 and R 12 each independently represents an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms. [ka] (In formula (B), R 13 ~R 17 each independently represents a hydrogen atom, an aryl group having 6 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms.

[0032] In the above formula (A), R 11 , R 12 Each of the alkyl groups represented by R is preferably a linear or branched alkyl group having 1 to 10 carbon atoms. 11 , R 12 When is an aryl group, it is preferably an aryl group represented by any one of the following formulae (1-a), (1-b), and (1-c): In the formula, * represents the bonding position.

[0033] [ka] (In formula (1-a), R A each independently represents an alkyl group having 1 to 10 carbon atoms. B each independently represents an alkyl group having 1 to 10 carbon atoms.

[0034] For the hindered phenol-based antioxidant, reference can be made to the descriptions in paragraph 0063 of JP-A-2018-090677 and paragraph 0076 of JP-A-2018-188496, the contents of which are incorporated herein by reference.

[0035] In addition to the above, the antioxidants can be found in paragraphs 0057 to 0061 of JP 2017-031313 A, the contents of which are incorporated herein by reference.

[0036] The content of the antioxidant is preferably 0.001 parts by mass or more, and more preferably 0.008 parts by mass or more, relative to 100 parts by mass of the resin composition. The upper limit of the content of the antioxidant is preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, even more preferably 0.2 parts by mass or less, even more preferably 0.15 parts by mass or less, still more preferably 0.10 parts by mass or less, and particularly preferably 0.08 parts by mass or less, relative to 100 parts by mass of the resin composition.

[0037] By setting the antioxidant content to the above lower limit or more, it is possible to obtain a curd or the like with improved resistance to heat discoloration. On the other hand, by setting the antioxidant content to the above upper limit or less, it is possible to obtain a curd or the like with good moist heat stability without deteriorating resistance to heat discoloration. The antioxidant may be used alone or in combination of two or more. When two or more antioxidants are used, the total amount is preferably within the above range.

[0038] <Other ingredients> In addition to the above-mentioned components, the resin composition of this embodiment may contain additives such as a thermoplastic resin other than polycarbonate resin, a heat stabilizer, a flame retardant, a flame retardant aid, and a mold release agent. Alternatively, as long as the effects of the present invention are not impaired, additives such as an ultraviolet absorber, a fluorescent brightener, an antifogging agent, a flow improver, a plasticizer, a dispersant, and an antibacterial agent may be contained. The content of such additives is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and even more preferably 0.1% by mass or less, based on the mass of the entire polycarbonate resin. The resin composition of this embodiment can be configured to be substantially free of PCTG (a polyester in which a portion of the ethylene glycol raw material of PET, for example, 70 to 90 mol %, is replaced with cyclohexanedimethanol) and PCL (polycaprolactone). "Substantially free of PCTG" means that the content of PCTG in the resin composition is 15% by mass or less of the resin composition, preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 1% by mass or less. Furthermore, "substantially free of PCL" means that the content of PCL in the resin composition is 2% by mass or less of the resin composition, preferably 1% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.3% by mass or less, and even more preferably 0.1% by mass or less.

[0039] <Physical properties of resin composition> Next, preferred physical properties of the resin composition of this embodiment will be described. The resin composition of this embodiment preferably has a glass transition temperature of 135°C or lower as measured by a differential scanning calorimeter. By setting the glass transition temperature to 135°C or lower, lamination performance can be more effectively improved. The glass transition temperature of the resin composition of this embodiment measured by a differential scanning calorimeter is more preferably 133°C or lower, even more preferably 131°C or lower, and may be 130°C or lower. Furthermore, the glass transition temperature of the resin composition of this embodiment measured by a differential scanning calorimeter is preferably 115°C or higher, more preferably 117°C or higher, even more preferably 119°C or higher, even more preferably 121°C or higher, and even more preferably 123°C or higher. By setting the glass transition temperature to be above the lower limit, the heat resistance of the obtained sheet tends to be further improved. The glass transition temperature is measured by the method described in the Examples below.

[0040] The resin composition of this embodiment also preferably has a Q value, which indicates melt fluidity, of 1 or more, more preferably 2 or more, even more preferably 4 or more, still more preferably 5 or more, and even more preferably 6 or more. By making the Q value equal to or greater than the lower limit, moldability tends to be further improved. The Q value is also preferably 20 or less, more preferably 18 or less, even more preferably 15 or less, still more preferably 12 or less, and even more preferably 9 or less. By making the Q value equal to or less than the upper limit, heat resistance tends to be further improved. The Q value is measured by the method described in the Examples below.

[0041] <Method of manufacturing resin composition> The method for producing the resin composition of the present embodiment is not limited, and a wide range of known production methods can be employed. A specific example of such a method is to premix the polycarbonate resin and other components to be blended as needed using various mixers such as a tumbler, a Henschel mixer, or a super mixer, and then melt-knead them using a mixer such as a Banbury mixer, a roll, a Brabender mixer, a single-screw kneading extruder, a twin-screw kneading extruder, or a kneader.

[0042] <Sheet manufacturing method> The resin composition of the present embodiment is usually formed into a sheet for use. The method for producing a sheet formed from the resin composition of the present embodiment is not particularly limited, but an example thereof is extrusion molding of a molten resin composition. As will be described later, a multilayer body including the sheet of this embodiment may be used, and in this case, the thermoplastic resins constituting each layer may be co-extruded.

[0043] <Security card sheet> The security card sheet of this embodiment is formed from the resin composition of this embodiment. In the sheet of this embodiment, the thickness is preferably 20 μm or more, more preferably 30 μm or more. By making the thickness equal to or greater than the lower limit, handling during production tends to be further improved. Furthermore, in the sheet of this embodiment, the thickness is preferably 400 μm or less, more preferably 300 μm or less. By making the thickness equal to or less than the upper limit, the degree of freedom in the configuration of the multilayer body tends to be further improved.

[0044] In the sheet of this embodiment, the surface roughness Ra is preferably 0.8 μm or more, and more preferably 0.9 μm or more. By setting the surface roughness Ra to the lower limit or more, air entrapment defects during lamination can be effectively reduced, and lamination properties can be improved. The surface roughness Ra is also preferably 3.0 μm or less, more preferably 2.8 μm or less, even more preferably 2.6 μm or less, even more preferably 2.4 μm or less, even more preferably 2.2 μm or less, and even more preferably 1.8 μm or less. By setting the surface roughness Ra to the upper limit or less, defects during printing can be effectively reduced, and lamination properties can be improved.

[0045] <Multilayer body> The multilayer body of this embodiment includes a sheet formed from the resin composition of this embodiment and at least one of the sheets of this embodiment. The sheet may be composed of only sheets formed from two or more of the resin compositions of this embodiment or the sheet of this embodiment, or may be composed of sheets formed from one or more of the resin compositions of this embodiment or the sheet of this embodiment and another layer. Examples of the other layer include a resin sheet and an adhesive layer. The multilayer body of the present embodiment preferably has at least two sheets, and the at least two sheets are each independently formed from the resin composition of the present embodiment. Thus, by forming a multilayer body having two or more layers of sheets formed from the resin composition of this embodiment, its usefulness as a security card is improved. That is, a layer formed from a resin composition of this embodiment that includes a black pigment can be used as a laser marking layer, a layer formed from a resin composition of this embodiment that includes a white pigment can be used as a white core layer, and a layer formed from a resin composition of this embodiment that does not include a colorant and does not include a black pigment or a white pigment (preferably does not include a colorant) can be used as an overlay layer. Here, it goes without saying that a resin composition that does not include a black pigment or a white pigment (colorant) does not exclude cases in which the resin composition of this embodiment contains trace amounts of black pigment and / or white pigment (colorant) within a range that does not deviate from the functionality required of the resin composition of this embodiment. In particular, in a multilayer body having two or more layers of sheets formed from the resin composition of this embodiment, by having a common composition in which preferably 90% by weight or more, more preferably 95% by weight or more, and even more preferably 98% by weight or more of the components excluding colorants, the interlayer adhesion of the resulting multilayer body can be further improved. The resin composition containing a polycarbonate resin having the terminal structure represented by the above formula (1) has the same meaning as the resin composition of this embodiment.

[0046] The multilayer body of this embodiment preferably shows no change even after 50,000 or more bending cycles in a dynamic bending test. Because of its high bending resistance, it can be preferably used for flexible cards, identification cards, and other items that are expected to be used for a long period of time. While there is no particular upper limit, it is usually 200,000 cycles or less. The dynamic bending test is performed as described in the Examples section below. The multilayer body of this embodiment preferably has a high OD value, preferably 1.8 or more. This configuration tends to further improve security and appearance. The upper limit of the OD value is not particularly limited, but is, for example, 2.5 or less. The OD value is measured as described in the Examples below.

[0047] <Security card> The security card of this embodiment includes the sheet of this embodiment or the multilayer body of this embodiment. By using such a configuration, a security card with excellent lamination performance and bending resistance, as well as excellent laser marking properties, can be obtained. In the security card of this embodiment, the thickness of at least one of the outermost sheets constituting the security card is preferably 20 μm to 400 μm, and more preferably 30 to 300 μm. By setting the thickness within this range, security tends to be further improved. That is, a thicker thickness makes it more difficult to tamper with the white core layer on which the laser marking layer and printed layer containing information are mounted.

[0048] 1 is a cross-sectional schematic diagram showing an example of a security card of this embodiment, with 10 indicating the security card, 11 indicating the overlay layer, 12 indicating the white core layer, 13 indicating the laser marking layer, and 14 indicating the overlay layer. Furthermore, the security card of this embodiment may be one in which the overlay layer (OL layer), laser marking layer (LM layer), white core layer (WC layer), white core layer, laser marking layer, and overlay layer are laminated in this order, as shown in FIG. The security card of this embodiment is suitable for having a sheet selected from an overlay layer, a white core layer, and a laser marking layer. More specifically, in the security card of this embodiment, at least one of the sheets constituting the security card other than the outermost sheet (e.g., the overlay layer) is preferably formed from the resin composition of this embodiment, further comprising a black pigment. Such a sheet is suitable as a laser marking layer. When the resin composition of this embodiment is used as a laser marking layer, its thickness is preferably 20 to 400 μm, and more preferably 30 to 300 μm. When used as a laser marking layer, as described above, it may contain an antistatic agent. For details of the type of antistatic agent, the content in the resin composition, etc., please refer to the description of the antistatic agent above. Furthermore, in the security card of this embodiment, at least one of the sheets constituting the security card other than the outermost sheet is preferably formed from the resin composition of this embodiment, further comprising a white pigment. Such a sheet is suitable as a white core layer. When the resin composition of this embodiment is used as the white core layer, its thickness is preferably 20 to 400 μm, and more preferably 100 to 300 μm. As described above, the white core layer may contain a dye (preferably a blue dye) and an antistatic agent. For details of the type of white pigment, dye, and antistatic agent, their content in the resin composition, etc., please refer to the descriptions of the colorant and antistatic agent above. Furthermore, in the security card of this embodiment, it is more preferable that at least one of the sheets constituting the security card is a sheet formed from the resin composition of this embodiment and further containing a black pigment, at least one other is a sheet formed from the resin composition of this embodiment and further containing a white pigment, and at least one other is a sheet formed from the resin composition of this embodiment but containing no black pigment or white pigment (preferably no colorant). Here, it goes without saying that a sheet "containing no black pigment or white pigment (colorant)" does not exclude cases in which a small amount of black pigment and / or white pigment (colorant) is contained within a range that does not detract from the functionality of the security card of this embodiment. Sheets formed from the resin composition of this embodiment and containing no black pigment or white pigment are suitable for overlay layers. When the resin composition of this embodiment is used for an overlay layer, its thickness is preferably 20 to 400 μm, more preferably 30 to 300 μm. As mentioned above, an antistatic agent may be contained. For details of the type of antistatic agent, the content in the resin composition, etc., please refer to the above description of the antistatic agent.

[0049] Examples of security cards in this embodiment include My Number cards, driver's licenses, health insurance cards, and passports.

[0050] In addition, in the present invention, the descriptions in paragraphs 0048 to 0059 of JP 2016-108424 A and the descriptions in paragraphs 0075 to 0088 of JP 2015-168728 A may be taken into consideration within the scope of the present invention, and the contents of these are incorporated into this specification. [Example]

[0051] The present invention will be described more specifically with reference to the following examples. The materials, amounts used, ratios, treatment details, treatment procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. When the measuring instruments used in the examples are difficult to obtain due to obsolescence or the like, measurements can be made using other devices having equivalent performance.

[0052] Raw material Polycarbonate resin (PC) <Synthesis example of PC-1> Based on the description in the Organic Chemistry Handbook, pages 143 - 150, esterification by dehydration reaction was carried out using 4-hydroxybenzoic acid manufactured by Tokyo Chemical Industry Co., Ltd. and 1-hexadecanol manufactured by Tokyo Chemical Industry Co., Ltd. to obtain hexadecyl parahydroxybenzoate (CEPB). 7.1 kg (31.14 mol) of bisphenol A (BPA) manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. and 30 g of hydrosulfite were added to 57.2 kg of a 9% by mass aqueous sodium hydroxide solution and dissolved. 40 kg of dichloromethane was added thereto, and while stirring, phosgene (4.33 kg) was blown in over 30 minutes while maintaining the solution temperature in the range of 15 - 25°C. After the blowing of phosgene was completed, a solution prepared by dissolving 6 kg of a 9% by mass aqueous sodium hydroxide solution, 11 kg of dichloromethane, and 443 g (1.22 mol) of the above-obtained CEPB in 10 kg of dichloromethane was added, and after vigorously stirring to emulsify, 10 ml of triethylamine was added as a polymerization catalyst and polymerization was carried out for about 40 minutes. The polymerization solution was separated into an aqueous phase and an organic phase, the organic phase was neutralized with phosphoric acid, and washing with pure water was repeated until the pH of the washing solution became neutral. The aromatic polycarbonate resin powder (PC-1) was obtained by evaporating and distilling off the organic solvent from this purified aromatic polycarbonate resin solution. The viscosity-average molecular weight of the obtained polycarbonate resin was 25,500, and the glass transition temperature was 125°C.

[0053] <Synthesis example of PC-2> In the above <Synthesis Example of PC-1>, CEPB was 348 g (0.96 mol), and the others were carried out in the same manner. The viscosity-average molecular weight of the obtained polycarbonate resin was 30,500, and the glass transition temperature was 131 °C.

[0054] S-3000F: Bisphenol A type polycarbonate resin, terminal structure is 4-tert-butylphenol group, glass transition temperature is 147 °C, viscosity-average molecular weight is 21,000, manufacturer: Mitsubishi Engineering-Plastics Corporation, Iupilon S-3000F H-4,000F: Bisphenol A type polycarbonate resin, terminal structure is 4-tert-butylphenol group, glass transition temperature is 141 °C, viscosity-average molecular weight is 16,000, manufacturer: Mitsubishi Engineering-Plastics Corporation, Iupilon H-4,000F

[0055] Black pigment Carbon black (CB): Monarch #280, manufactured by Cabot Corporation White pigment Titanium oxide: PC-3, manufacturer: Ishihara Sangyo Co., Ltd. Titanium oxide: PFC-310, manufacturer: Ishihara Sangyo Co., Ltd. Titanium oxide: PFC-312, manufacturer: Ishihara Sangyo Co., Ltd. Titanium oxide: PFC-317, manufacturer: Ishihara Sangyo Co., Ltd. Dye Oil-soluble dye: Macrolex Violet 3R, manufacturer: Lanxess Oil-soluble dye: Macrolex Blue RR, manufacturer: Lanxess Antistatic agent Ionic liquid: trihexyltetradecylphosphonium = bis(trifluoromethanesulfonyl)imide, manufacturer: Fujifilm Wako Pure Chemical Corporation Antioxidant PEP-36: bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite: Adeka Stab PEP-36, manufacturer: ADEKA Corporation 2112: Tris(2,4-di-tert-butylphenyl)phosphite: Adekastab 2112, Manufacturer: ADEKA Corporation S-9228PC: Bis(2,4-dicumylphenyl)pentaerythritol diphosphite, Doverphos S-9228PC, Manufacturer: Dover Chemical Company

[0056] PCL: Polycaprolactone, H1P, manufactured by Daicel Corporation PCTG: Polyester in which 80 mol% of the ethylene glycol, the raw material for PET (polyethylene terephthalate), has been replaced with cyclohexanedimethanol, J2003, manufactured by SK Chemicals Co., Ltd.

[0057] Examples 1 to 11 and Comparative Examples 1 to 4 (Production of Single-Layer Sheets) The components were weighed and mixed in a tumbler for 15 minutes to obtain the composition shown in the table below (the amount of each component is shown in parts by mass), then melt-kneaded in a vented twin-screw extruder at a cylinder temperature of 280°C, and pellets were obtained by strand cutting. The twin-screw extruder used was a "TEX30α" manufactured by Japan Steel Works, Ltd., with a screw diameter of 32 mm. The resulting pellets were used to produce a film in the following manner. The pellets obtained above were dried at 120°C for 5 hours, and then films with a thickness of 100 μm or 200 μm were produced using a T-die melt extruder consisting of a vented twin-screw extruder (manufactured by The Japan Steel Works, Ltd., "TEX30α") ​​with a barrel diameter of 32 mm and a screw L / D of 31.5, at a discharge rate of 10 kg / h and a screw rotation speed of 63 rpm. The cylinder and die temperatures were 280°C. A roll with a surface roughness Ra of 1.6 μm was used for molding.

[0058] <Measurement of glass transition temperature> The glass transition temperatures of the resin compositions and resins were measured as follows: Two cycles of temperature increase and decrease were carried out according to the DSC measurement conditions below, and the glass transition temperature during the second temperature increase cycle was measured. The intersection point of the straight line obtained by extending the baseline on the low-temperature side to the high-temperature side and the tangent line at the inflection point was defined as the glass transition temperature (Tg). The measurement start temperature was 30°C, the heating rate was 10°C / min, the reaching temperature was 250°C, and the cooling rate was 20°C / min. A differential scanning calorimeter (DSC, "DSC7020" manufactured by Hitachi High-Tech Science Corporation) was used as the measuring device.

[0059] <Surface roughness (Ra) of the resin sheet> The surface roughness (measurement conditions: λc 0.8, λs 2.5) was measured in accordance with ISO 4287:1997 at three arbitrary positions on the surface of the obtained resin sheet, and the surface roughness (Ra) was calculated as the average of the three positions. The unit was shown in μm. A small surface roughness measuring machine Surf Test SJ-210 manufactured by Mitutoyo Corporation was used for the measurement.

[0060] <Measurement of Q value>[[ID=##]] The Q value was measured by the method described in Appendix JA of JIS K7210-1:2014. Using a flow tester, with a die having a hole diameter of 1.0 mm and a length of 10 mm, at a test temperature of 280°C and a test force of 160 kg / cm 2 The amount of molten resin discharged under the conditions of a post-heat time of 420 seconds was used as the flow value (×0.01 cm 3 / s). A flow tester CFD500D manufactured by Shimadzu Corporation was used as the flow tester.

[0061]

Table 1

[0062]

Table 2

[0063]

Table 3

[0065] <Dynamic bending test> The durability of the multilayer was evaluated as follows. Using the obtained multilayer, a card bending test was performed with BGI110 A-C (manufactured by BGI), and the number of bending times until cracks occurred in the multilayer was measured. This dynamic bending test was conducted in accordance with JIS X6305-1 (ISO / IEC10373-1), and the evaluation was performed as follows based on the numerical value of the number of bending times until cracks occurred. A: 50,000 times or more B: 20,000 times or more and less than 50,000 times C: Less than 20,000 times

[0066] <Measurement of OD value (Laser marking property)> The maximum OD value of the resulting multilayer structure was measured using a spectrodensitometer 504 manufactured by X-rite. Specifically, a Nd:YVO4 laser (PL-E Air10 manufactured by Rofin-Basel Japan) was irradiated from the transparent surface layer (polycarbonate resin film) side of the multilayer structure, and a 3.6 mm square black rectangle was printed (laser marked) at a scan speed of 1,000 mm / s, an input current of 21.0 to 30.0 A in 1 A increments, and a frequency of 10 to 100 kHz in 10 kHz increments. The OD value of the printed area was measured using the spectrodensitometer 504. The highest OD value in the printed area of ​​the multilayer structure was evaluated as follows. A: The OD value was 1.80 or higher. B:OD value was greater than 1.70 and less than 1.80. C:OD values ​​were less than 1.70.

[0067] <Adhesion temperature> The adhesion temperature was evaluated by the following method. The monolayer sheets obtained above from the Examples and Comparative Examples were stacked to form one set, with the layer configuration shown in Figure 2 and Table 4: overlay layer, laser marking layer, white core layer, white core layer, laser marking layer, overlay layer. Ten sets of these stacks were heat-pressed. A 2 mm thick cushion paper and a 1 mm thick SUS plate were sandwiched between the heat press and the film, and a 1 mm thick SUS plate was sandwiched between each set. The temperature at which each layer (overlay layer, laser marking layer, white core layer, white core layer, laser marking layer, overlay layer) in the fifth set adhered was evaluated. "Adhesion" here refers to a state in which no delamination occurs between the sheets when a 1.5 cm x 1.5 cm area is cut into the surface of the multilayer body in a grid pattern at 3 mm intervals with a cutter knife and cellophane tape is pressed against the cut areas and peeled off. The evaluation was carried out by five experts and the decision was made by majority vote.

[0068] <Lamination performance> The presence or absence of lamination defects when laminating the sheets was evaluated using the same method as for the adhesion temperature. Here, lamination defects refer to a state in which the sheets are in close contact but have air trapped between them, resulting in a wrinkled appearance. A: No lamination defects occurred. B: Lamination failure has occurred.

[0069] Comparative Examples 5 to 8 Sheets A to H having the compositions shown in Table 5 below were produced in the same manner as in Example 1, etc. Multilayer bodies were produced using the obtained sheets and the single-layer sheets obtained in Examples 1 to 3, 9 to 11, and Comparative Examples 5 to 8. Specifically, in Example 12, the above single-layer sheets were used, and the layer structure was changed as shown in Table 5 below, and other procedures were carried out in the same manner to obtain multilayer bodies. The resulting multilayer body was subjected to a dynamic bending test, and measurements of the OD value, adhesion temperature, and lamination property were carried out in the same manner as in Example 12.

[0070] [Table 4] [Table 5] [Explanation of symbols]

[0071] 10 Security Card 11 Overlay Layer 12 White core layer 13 Laser marking layer 14 Overlay Layer

Claims

1. A multilayer body having at least two layers of sheets, each of which is independently formed from a resin composition, The resin composition is a resin composition for security cards, comprising a polycarbonate resin having a terminal structure represented by the following formula (1): A multilayer body in which sheets formed from the resin composition are adjacent to each other. Formula (1) 【Chemical 1】 (In formula (1), R １ represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, R ２ each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents an integer of 0 to 4. * represents a bonding site with the polycarbonate resin.

2. 2. The multilayer body according to claim 1, wherein the resin composition has a glass transition temperature of 115°C to 135°C as measured by a differential scanning calorimeter.

3. 3. The multilayer body according to claim 1, wherein the resin composition has a melt fluidity Q value of 1×0.01 cm 3 / sec to 20×0.01 cm 3 / sec.

4. The multilayer body according to any one of claims 1 to 3, wherein the polycarbonate resin has a viscosity average molecular weight of 18,000 to 40,000.

5. A multilayer body described in any one of claims 1 to 4, wherein the resin composition further contains a black pigment.

6. A multilayer body described in any one of claims 1 to 4, wherein the resin composition further contains a white pigment.

7. A multilayer body as described in Claim 6, wherein the resin composition further contains a blue dye in an amount of 10 to 100 ppm by mass relative to the resin composition.

8. A multilayer body described in any one of claims 1 to 7, wherein the resin composition further contains an antistatic agent.

9. A multilayer body described in any one of claims 1 to 8, wherein the sheet formed from the resin composition is a sheet for a security card.

10. A multilayer body as described in Claim 9, wherein the thickness of the security card sheet is 20 μm to 400 μm.

11. A multilayer body as described in claim 9 or 10, wherein the surface roughness Ra of the security card sheet is 0.8 μm to 3.0 μm.

12. A security card comprising at least one multilayer body according to any one of claims 1 to 11.

13. 13. The security card according to claim 12, wherein at least one of the outermost sheets constituting the security card has a thickness of 20 μm to 400 μm.

14. 14. The security card according to claim 12 or 13, wherein at least one of the sheets constituting the security card other than the outermost sheet is formed from the resin composition used in the multilayer body according to claim 5.

15. The security card according to any one of claims 12 to 14, wherein at least one of the sheets constituting the security card other than the outermost sheet is formed from the resin composition used in the multilayer body according to claim 6.

16. The security card according to any one of claims 12 to 15, wherein at least one of the sheets constituting the security card is a sheet formed from the resin composition used in the multilayer body according to claim 5, at least one other is a sheet formed from the resin composition used in the multilayer body according to claim 6, and at least one other is a sheet formed from the resin composition used in the multilayer body according to any one of claims 1 to 4, and is a sheet that does not contain a black pigment or a white pigment.

17. The security card according to any one of claims 12 to 16, wherein the security card is used for any one of a My Number card, a driver's license, a health insurance card, and a passport.

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