Card or passport laminate and card and passport

Abstract

This invention provides a laminate for cards or passports that has good UV resistance, composed of a resin film that does not use UV absorbers. [Solution] A laminate comprising an oversheet on both sides of a core sheet, wherein both the core sheet and the resin film constituting the oversheet contain a polycarbonate resin (A) having a structural unit (A1) derived from a dihydroxy compound having a part of the structure represented by the following formula (1), and does not contain an ultraviolet absorber, and in a weathering exposure test using a xenon weather meter, at 63°C, 50% RH, and an ultraviolet irradiation intensity of 180 W / cm² 2 A laminate for cards or passports in which the color change (ΔE) before and after 100 hours of ultraviolet irradiation is 10.0 or less under the specified conditions. [Formula 1] JPEG2026144665000009.jpg1547 However, this excludes cases where the portion represented by formula (1) is part of -CH2-OH.

Description

[Technical Field]

[0001] The present invention relates to laminates for cards or passports, and to cards and passports. [Background technology]

[0002] In passports, the data pages where personal information and photographs are written are generally constructed by layering multiple films. These data pages may have security features added, such as laser printing for information, or special printing techniques like lenticular or holograms. Similarly, credit cards are also constructed from layered films, with laser printing for information and special printing techniques to enhance security.

[0003] Passport data pages and cards are broadly divided into a transparent layer and a colored layer consisting of a white layer, etc. Security features and laser printing are generally applied to the transparent layer. On the other hand, the colored layer, also known as the core sheet, contains inlets such as IC chips. Therefore, the core sheet is required to properly hold inlets such as IC chips and to conceal them.

[0004] Core sheets are known to be formed from thermoplastic resin compositions containing thermoplastic resins such as polyester resin, polycarbonate resin, or mixtures thereof. Furthermore, these thermoplastic resin compositions are known to contain additives such as titanium dioxide, inorganic fillers such as talc, mica, and calcium carbonate, and rubber-like elastomers. The inclusion of titanium dioxide and inorganic fillers in the core sheet provides concealment, allowing it to hide inlets such as IC chips. Polycarbonate resin, in particular, is susceptible to degradation from ultraviolet light, which may make long-term use difficult depending on the storage and usage conditions of the passport.

[0005] On the other hand, in recent years, passports and cards have been required to have high UV resistance. Conventionally, methods have been used that include an ultraviolet absorber in the resin film, which is a component of the material (for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] WO2020 / 116209 issue [Overview of the project] [Problems that the invention aims to solve]

[0007] However, UV absorbers contained in resin films for passports or cards are susceptible to bleed-out, or require specially structured UV absorbers to impart performance, resulting in limited versatility and not always sufficient performance. Furthermore, there is a demand for passports and cards with sufficient durability to withstand exposure to sunlight outdoors for approximately one year without deterioration.

[0008] Therefore, the object of the present invention is to provide a laminate for cards or passports that has good UV resistance, composed of a resin film having specific structural units and without using an ultraviolet absorber. [Means for solving the problem]

[0009] As a result of diligent research, the inventors have discovered that by using a resin with a specific structure in a resin film for forming an oversheet or core sheet, UV resistance can be improved compared to conventionally used general-purpose resins, even without containing an ultraviolet absorber, and have completed the present invention as follows. That is, the present invention provides the following [1] to

[16] .

[0010] [1] A laminate comprising an oversheet on both sides of a core sheet, Each of the resin films constituting the core sheet and the oversheet contains a polycarbonate resin (A) having a structural unit (A1) derived from a dihydroxy compound having a site represented by the following formula (1) in a part of the structure, and does not contain an ultraviolet absorber, In a weather resistance exposure test using a xenon weather meter, 63°C, 50%RH, ultraviolet irradiation intensity is 180 W / cm 2 A laminate for a card or a passport, wherein a color change (ΔE) represented by the following formula (D) before and after irradiation with ultraviolet light for 100 hours under the conditions is 10.0 or less.

Chemical Formula

[10] The laminate for a card or passport according to any one of [1] to [9] above, wherein at least one of the resin films further contains an impact-resistant agent, and the content of the impact-resistant agent in the resin film is 1 to 30% by mass.

[11] The laminate for a card or passport according to any of [1] to

[10] above, wherein the resin film constituting the oversheet contains an impact-resistant improving agent.

[12] A laminate for a card or passport according to any of [1] to

[11] above, wherein the thickness of the resin film is 10 to 300 μm.

[13] A laminate for a card or passport according to any of [1] to

[12] above, having an opening.

[14] A laminate for a card or passport as described in any of [1] to

[13] above, comprising an inlet sheet.

[15] A card comprising a card or passport laminate as described in any of [1] to

[14] above.

[16] A passport comprising a card or passport laminate as described in any of [1] to

[14] above. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a laminate for cards or passports with good UV resistance, which is composed of a resin film having specific structural units and does not use an ultraviolet absorber. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic cross-sectional view showing an example of a laminate for a card or passport. [Figure 2] This is a schematic cross-sectional view showing an example of a laminate for a card or passport. [Figure 3]This is a schematic cross-sectional view showing an example of an IC sheet. [Figure 4] This is a schematic cross-sectional view showing an example of a laminated structure using a card or passport film with a clear window. [Modes for carrying out the invention]

[0013] The present invention will be described in detail below with reference to embodiments. However, the present invention is not limited to the embodiments described below. Furthermore, the terms "film" and "sheet" used in the following description are not clearly distinguished, and the term "film" includes "sheet," and the term "sheet" includes "film."

[0014] The laminate for cards or passports of the present invention (hereinafter also referred to as "the laminate") is a laminate comprising a core sheet and oversheets provided on each of the two sides of the core sheet. Both the core sheet and the oversheets are resin films (hereinafter also referred to as "the film") that contain the polycarbonate resin (A) described below and do not contain an ultraviolet absorber. In the following description, the oversheets provided on each side of the core sheet may be referred to as the first oversheet and the second oversheet, respectively. When simply referring to an oversheet, both the first oversheet and the second oversheet will be described.

[0015] <This film> (Polycarbonate resin (A)) The polycarbonate resin (A) contained in this film is a polycarbonate resin that includes a structural unit (hereinafter sometimes referred to as structural unit (A1)) derived from a dihydroxy compound having a part of its structure represented by the following formula (1). In this laminate, both the core sheet and the oversheets (first and second oversheets) are made of resin films containing polycarbonate resin (A) with structural unit (A1). As a result, even without each film containing an ultraviolet absorber, UV resistance is improved, and the color tone is less likely to change even when exposed to ultraviolet light during outdoor use. Furthermore, the polycarbonate resin containing structural unit (A1) can be manufactured from plant-derived raw materials, thus reducing the environmental impact.

[0016] [ka] However, this excludes cases where the part represented by formula (1) is part of -CH2-OH. That is, the dihydroxy compound refers to one that contains two hydroxyl groups and at least the part represented by formula (1).

[0017] Dihydroxy compounds having a moiety represented by formula (1) as part of their structure are not particularly limited as long as they have the structure represented by formula (1) in their molecule, but specifically include 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3-methylphenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3-isopropylphenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3-isobutylphenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3-tert-butylphenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3-isobutylphenyl)fluorene Examples include compounds having aromatic groups in the side chain and ether groups bonded to the aromatic groups in the main chain, such as 9,9-(4-(2-hydroxyethoxy)-3-phenylphenyl)fluorene, 9,9-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)fluorene, 9,9-(4-(2-hydroxyethoxy)-3-tert-butyl-6-methylphenyl)fluorene, and 9,9-(4-(3-hydroxy-2,2-dimethylpropoxy)phenyl)fluorene, as well as dihydroxy compounds having a cyclic ether structure, such as dihydroxy compounds represented by the following formula (2) and spiroglycols represented by the following formula (3).

[0018] Among the above, dihydroxy compounds having a cyclic ether structure are preferred, and anhydrous sugar alcohols represented by formula (2) are particularly preferred. More specifically, dihydroxy compounds represented by formula (2) include isosorbide, isomannide, and isoidette, which are stereoisomers of each other. In addition, dihydroxy compounds represented by the following formula (3) include 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane (common name: spiroglycol), 3,9-bis(1,1-diethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane, and 3,9-bis(1,1-dipropyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane. These can be used individually, or two or more can be used in combination.

[0019] [ka] [ka] In formula (3), R1 to R4 are each independently alkyl groups having 1 to 3 carbon atoms.

[0020] The dihydroxy compound represented by formula (2) is an ether diol that can be produced from carbohydrates using plant-derived materials as raw materials. In particular, isosorbide can be produced inexpensively by hydrogenating and then dehydrating D-glucose obtained from starch, and it is readily available as a resource. For these reasons, isosorbide is the most preferred choice.

[0021] A polycarbonate resin containing structural unit (A1) may further contain structural units other than structural unit (A1) as structural units derived from dihydroxy compounds. For example, it is preferable to contain structural units derived from at least one dihydroxy compound selected from aliphatic dihydroxy compounds and alicyclic dihydroxy compounds (hereinafter sometimes referred to as structural unit (A2)). Alicyclic dihydroxy compounds are more preferable as structural unit (A2).

[0022] The aliphatic dihydroxy compounds used in polycarbonate resins containing structural unit (A1) are not particularly limited in terms of the number of carbon atoms, but preferably aliphatic dihydroxy compounds having about 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms. Specifically, examples include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 2-ethyl-1,6-hexanediol, 2,2,4-trimethyl-1,6-hexanediol, 1,10-decanediol, 1,12-dodecanediol, hydrogenated dilinoleyl glycol, hydrogenated dioleyl glycol, and the like. Preferably, at least one selected from ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, and 1,12-dodecanediol is used, and more preferably, at least one selected from ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol is used. In addition, structural units derived from aliphatic dihydroxy compounds can be used, for example, those described in International Publication No. 2004 / 111106.

[0023] The structural unit (A1) derived from the alicyclic dihydroxy compound used in the polycarbonate resin preferably includes at least one of a five-membered ring structure or a six-membered ring structure, and the six-membered ring structure may be fixed in a chair-like or boat-like shape by covalent bonds. By including structural units derived from alicyclic dihydroxy compounds of these structures, the heat resistance of the resulting polycarbonate resin can be improved. The number of carbon atoms in the alicyclic dihydroxy compound is, for example, 5 to 70, preferably 6 to 50, and more preferably 8 to 30. The above alicyclic dihydroxy compounds are preferably at least one selected from cyclohexanedimethanol, tricyclodecanedimethanol, adamantanediol, and pentacyclopentadecanedimethanol. From the viewpoint of economy and heat resistance, cyclohexanedimethanol or tricyclodecanedimethanol is more preferred, and cyclohexanedimethanol is even more preferred. Of the cyclohexanedimethanol, 1,4-cyclohexanedimethanol is particularly preferred because it is readily available industrially. Furthermore, structural units derived from alicyclic dihydroxy compounds, as described in International Publication No. 2007 / 148604, can also be used.

[0024] In polycarbonate resins containing structural unit (A1), the content of structural unit (A1) is preferably 30 mol% or more, more preferably 40 mol% or more, even more preferably 45 mol% or more, and preferably 75 mol% or less, more preferably 70 mol% or less, and even more preferably 65 mol% or less, of the structural units derived from dihydroxy compounds. By keeping it within this range, discoloration caused by the carbonate structure and discoloration caused by trace amounts of impurities due to the use of plant resource materials can be effectively suppressed. Furthermore, it tends to be possible to achieve a suitable balance of physical properties such as moldability, mechanical strength, and heat resistance, which is difficult to achieve with polycarbonate resins composed only of structural unit (A1). On the other hand, the content of structural unit (A2) in the polycarbonate resin containing structural unit (A1) is preferably 25 mol% or more, more preferably 30 mol% or more, even more preferably 35 mol% or more, and also preferably 70 mol% or less, more preferably 60 mol% or less, and even more preferably 55 mol% or less, among the structural units derived from the dihydroxy compound.

[0025] A polycarbonate resin containing structural unit (A1) preferably consists of structural unit (A1) and structural unit (A2) derived from a dihydroxy compound, but may also contain structural units derived from other dihydroxy compounds. Specifically, this may involve copolymerizing a small amount of aromatic ring-containing dihydroxy compound, such as bisphenol, represented by 2,2-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A). Using aromatic ring-containing dihydroxy compounds is expected to efficiently improve heat resistance and moldability, but if added in large quantities, it tends to cause problems with weather resistance, so it is best to use it in an amount that does not cause problems with weather resistance. Examples of aromatic ring-containing dihydroxy compounds other than bisphenol A include α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene (bisphenol M), 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide, 2,2-bis(4-hydroxy-3-methylphenyl)propane (bisphenol C), 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane (bisphenol AF), and 1,1-bis(4-hydroxyphenyl)decane.

[0026] Polycarbonate resins containing the above-described structural unit (A1) can be produced by commonly used polymerization methods, including the phosgene method and the transesterification method involving reaction with diester carbonate. Among these, the transesterification method is preferred, in which a dihydroxy compound having a part of its structure represented by formula (1) and other dihydroxy compounds are reacted with diester carbonate in the presence of a polymerization catalyst. The transesterification method is a polymerization method in which a dihydroxy compound, diester carbonate, a basic catalyst, and an acidic substance to neutralize the catalyst are mixed and a transesterification reaction is carried out. Specific examples of diester carbonates are as described above, with diphenyl carbonate being particularly preferred.

[0027] The mass-average molecular weight of polycarbonate resin (A) is typically 10,000 or more, preferably 30,000 or more, more preferably 38,000 or more, and even more preferably 40,000 or more, while also typically in the range of 100,000 or less, preferably 80,000 or less, considering the balance between mechanical properties and moldability. The mass-average molecular weight can be measured using gel permeation chromatography (GPC) with polystyrene as the standard substance. Furthermore, as will be described later, the polycarbonate resin (A) is preferably low molecular weight in order to suppress foaming even without the addition of additive (X). From this viewpoint, the mass average molecular weight of the polycarbonate resin is preferably 70,000 or less, more preferably 65,000 or less, even more preferably 60,000 or less, and even more preferably 56,000 or less. On the other hand, the polycarbonate resin (A) is also preferably high molecular weight from the viewpoint of impact resistance, dynamic bending durability, and heat resistance such as load deflection temperature. From this viewpoint, it is preferable that the mass average molecular weight of the polycarbonate resin be 37,000 or more, more preferably 40,000 or more, even more preferably 45,000 or more, even more preferably 50,000 or more, even more preferably 55,000 or more, even more preferably 58,000 or more, even more preferably 60,000 or more, and particularly preferably 63,000 or more.

[0028] Furthermore, the viscosity-average molecular weight of the polycarbonate resin (A) is typically 12,000 or more, preferably 15,000 or more, more preferably 20,000 or more, even more preferably 22,000 or more, even more preferably 26,000 or more, particularly preferably 29,000 or more, and also typically in the range of 50,000 or less, preferably 45,000 or less, more preferably 40,000 or less, and even more preferably 35,000 or less. In addition, from the viewpoint of suppressing foaming even without the addition of additive (X), it is preferable that the viscosity-average molecular weight be 33,000 or less. The viscosity-average molecular weight was measured using dichloromethane as the solvent, and the intrinsic viscosity ([η]) (unit dl / g) at 20°C was determined using an Ubbelohde viscometer, based on Schnell's viscosity formula: η = 1.23 × 10⁻⁶ -4 M 0.83 It can be calculated from the formula.

[0029] The melt flow rate (300°C, 1.2 kgf) of polycarbonate resin (A) is preferably 1 g / 10 min or more, more preferably 3 g / 10 min or more, even more preferably 5 g / 10 min or more, even more preferably 6 g / 10 min or more, and also preferably 50 g / 10 min or less, more preferably 40 g / 10 min or less, even more preferably 30 g / 10 min or less, even more preferably 25 g / 10 min or less, and even more preferably 20 g / 10 min or less. The melt flow rate of polycarbonate resin can be measured in accordance with ISO 1133.

[0030] The molecular weight of the polycarbonate resin (A) can be expressed in terms of reduced viscosity. From the viewpoint of imparting mechanical strength, the reduced viscosity is preferably 0.3 dL / g or more, and more preferably 0.35 dL / g or more. From the viewpoint of improving productivity and moldability by increasing fluidity during molding, the reduced viscosity is preferably 1.2 dL / g or less, more preferably 1 dL / g or less, and more preferably 0.8 dL / g or less. The reduced viscosity is measured using a Ubbelohde viscometer at a temperature of 20.0°C ± 0.1°C, after precisely preparing the polycarbonate resin concentration to 0.6 g / dL using dichloromethane as the solvent.

[0031] The glass transition temperature of the polycarbonate resin (A) is, for example, 70°C or higher, preferably 80°C or higher, more preferably 85°C or higher, even more preferably 90°C or higher, and also, for example, 140°C or lower, preferably 130°C or lower, more preferably 125°C or lower, and even more preferably 120°C or lower. Furthermore, it is generally preferable that the polycarbonate resin (A) has a single glass transition temperature. By setting the glass transition temperature above the lower limit mentioned above, it becomes easier to impart appropriate heat resistance and reduce dimensional changes when manufacturing cards or passports. Furthermore, setting it below the upper limit also improves moldability and other properties. The glass transition temperature can be obtained by using a viscoelastic spectrometer and performing dynamic viscoelastic temperature dispersion measurements in tensile mode with a strain of 0.07%, a frequency of 1 Hz, and a heating rate of 3°C / min, in accordance with JIS K7244-4:1999, to determine the temperature of the peak of the loss modulus.

[0032] As described above, this film may use polycarbonate resin (A) as the resin, but the resin constituting this film may be polycarbonate resin (A) alone or in combination with other resins. As such resins, it is good to use commonly used known resins, for example, thermoplastic resins are good, and polyester resins are also preferred.

[0033] (Polyester resin) Examples of polyester resins include polyesters obtained by polycondensation of dicarboxylic acid and dihydroxy compounds. Dicarboxylic acid derivatives such as esters and acid halides may also be used as the dicarboxylic acid in the synthesis of the polyester resin. Using a polyester resin results in good low-temperature fusion properties, making it easier to adhere this film to other films by heat fusion at relatively low temperatures. It also facilitates improvements in processability.

[0034] From the viewpoint of heat resistance, aromatic dicarboxylic acids are preferred as the dicarboxylic acids used to obtain polyester resins, and therefore, it is preferable that the polyester resin contains structural units derived from aromatic dicarboxylic acids. There are no particular restrictions on the aromatic dicarboxylic acid, and examples include terephthalic acid, isophthalic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, anthracenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 5-sulfoisophthalic acid, sodium 3-sulfoisophthalate, 2-chloroterephthalic acid, 2,5-dichloroterephthalic acid, 2-methylterephthalic acid, etc. Among these, terephthalic acid and isophthalic acid are preferred, and terephthalic acid is more preferred. Aromatic dicarboxylic acids may be used individually or in combination of two or more.

[0035] It is even more preferable that the structural units derived from aromatic dicarboxylic acids are present in the polyester resin at a concentration of, for example, 60 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, and even more preferably 90 mol% or more. Furthermore, there is no particular upper limit, and it is acceptable as long as it is 100 mol% or less, but most preferably 100 mol%.

[0036] Furthermore, the polyester resin may contain a small amount of structural units derived from aliphatic dicarboxylic acids (usually 40 mol% or less, for example 30 mol% or less, preferably 20 mol% or less) in addition to structural units derived from aromatic dicarboxylic acids. There are no particular restrictions on the aliphatic dicarboxylic acids, and examples include oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sebacic acid, azelaic acid, dodecanedionic acid, dimer acid, 1,3 or 1,4-cyclohexanedicarboxylic acid, cyclopentanedicarboxylic acid, and 4,4'-dicyclohexyldicarboxylic acid. The aliphatic dicarboxylic acid may be used alone or in combination of two or more.

[0037] The polyester resin preferably contains structural units derived from chain-like dihydroxy compounds. The inclusion of these structural units in the polyester resin tends to result in good low-temperature fusion properties for the film. The chain-like dihydroxy compounds used in polyester resins may be linear or have a branched structure. Specific examples of chain-like dihydroxy compounds include chain-like dihydroxy compounds with approximately 2 to 18 carbon atoms, such as ethylene glycol (EG), diethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, triethylene glycol, 1,2-hexadecanediol, and 1,18-octadecanediol, as well as polyglycols such as polytetramethylene ether glycol, polypropylene glycol, and polyethylene glycol. Among these, chain-type dihydroxy compounds having 2 to 12 carbon atoms are preferred, and more preferably one or more selected from ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol, with ethylene glycol (EG) being particularly preferred. The chain-type dihydroxy compounds may be used individually or in combination of two or more.

[0038] The polyester resin is preferably a copolymer polyester resin obtained by using two or more dihydroxy compounds as copolymer components. Specifically, it is preferable to use alicyclic dihydroxy compounds in addition to chain-type dihydroxy compounds as the dihydroxy compounds used to obtain the polyester resin. Therefore, it is preferable that the polyester resin has structural units derived from alicyclic dihydroxy compounds in addition to structural units derived from chain-type dihydroxy compounds. Using alicyclic dihydroxy compounds tends to result in good heat resistance, solvent resistance, etc. Specific examples of alicyclic dihydroxy compounds include tetramethylcyclobutanediol, cyclohexanedimethanol (CHDM), tricyclodecanedimethanol, adamantanediol, and pentacyclopentadecanedimethanol. Among these, tetramethylcyclobutanediol and cyclohexanedimethanol are preferred. Of the cyclohexanedimethanol compounds available, there are 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, and 1,4-cyclohexanedimethanol, but 1,4-cyclohexanedimethanol is preferred due to its easy industrial availability. Generally, 2,2,4,4-tetramethyl-1,3-cyclobutanediol is used as the tetramethylcyclobutanediol. The alicyclic dihydroxy compound may be used alone or in combination of two or more. At least cyclohexanedimethanol is preferred as the alicyclic dihydroxy compound, and from the viewpoint of flexibility, tetramethylcyclobutanediol and cyclohexanedimethanol are preferred in combination.

[0039] In polyester resins, the proportion of structural units derived from alicyclic dihydroxy compounds is, for example, 5 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more, and also, for example, 99 mol% or less, preferably 95 mol% or less, more preferably 90 mol% or less, and even more preferably 80 mol% or less, out of a total of 100 mol% of structural units derived from chain-type dihydroxy compounds. In polyester resins, particularly in terms of heat resistance such as storage modulus and thermal expansion coefficient under high-temperature environments, and solvent resistance, the proportion of structural units derived from alicyclic dihydroxy compounds is preferably more than 65 mol%, more preferably 70 mol% or more, even more preferably 80 mol% or more, and even more preferably 90 mol% or more, out of a total of 100 mol% of structural units derived from chain-type dihydroxy compounds and structural units derived from alicyclic dihydroxy compounds. Furthermore, in terms of low-temperature fusion properties, the proportion of structural units derived from alicyclic dihydroxy compounds is preferably 65 mol% or less, more preferably 55 mol% or less, even more preferably 45 mol% or less, and even more preferably 40 mol% or less, out of a total of 100 mol% of structural units derived from chain-type dihydroxy compounds and structural units derived from alicyclic dihydroxy compounds.

[0040] As the dihydroxy compound used in the polyester resin, dihydroxy compounds other than chain-type dihydroxy compounds and alicyclic dihydroxy compounds (also referred to as "other dihydroxy compounds") may be used, as long as they do not impair the effects of the present invention. In the polyester resin, the content of structural units derived from other dihydroxy compounds is, for example, 20 mol% or less, preferably 10 mol% or less, more preferably 5 mol% or less, and most preferably 0 mol% per 100 moles of structural units derived from dihydroxy compounds in the polyester resin. Other dihydroxy compounds include p-xylenediol, 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), tetrabromobisphenol A, tetrabromobisphenol A-bis(2-hydroxyethyl ether), α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene (bisphenol M), 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide, 2,2-bis(4-hydroxy-3-methylphenyl)propane (bisphenol C), 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane (bisphenol AF), and 1,1-bis(4-hydroxyphenyl)decane.

[0041] Among the above, the polyester resin preferably contains structural units derived from ethylene glycol and structural units derived from cyclohexanedimethanol, from the viewpoint of low-temperature fusion properties, heat resistance, and solvent resistance, and also preferably contains structural units derived from ethylene glycol, structural units derived from cyclohexanedimethanol, and structural units derived from tetramethylcyclobutanediol.

[0042] The polyester resin is preferably amorphous polyester. Using amorphous polyester tends to improve the adhesion of this film to other components such as resin films. The amorphous polyester can be any polyester that is substantially non-crystalline. Examples of substantially non-crystalline polyesters (including those with low crystallinity) include polyesters that do not show a clear crystallization peak when heated by differential scanning calorimeter (DSC), polyesters that have crystalline properties but have a slow crystallization rate and do not become highly crystalline when molded by extrusion film formation, and polyesters that have crystalline properties but have a low heat of crystallization (ΔHm) of 10 J / g or less when heated by differential scanning calorimeter (DSC). In other words, amorphous polyester in this invention also includes "crystalline polyester that is in a non-crystalline state."

[0043] The resin constituting this film preferably contains polycarbonate resin (A) as the main component, and the amount of polycarbonate resin (A) is, for example, 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass, based on the total amount of resin constituting this film.

[0044] [Layer structure of the film] This film may have a single-layer structure or a multi-layer structure. In the following description, a multi-layer film may be referred to as a laminated film. In the case of a multi-layer structure, the details of the resin in each layer constituting the laminated film are as described above. Therefore, it is preferable that the resin constituting each layer contains polycarbonate resin (A). The resin constituting each layer may be polycarbonate resin (A) alone, or it may be mixed with resins other than polycarbonate resin (A). For the resin other than polycarbonate resin (A), it is preferable to use a commonly used known resin, for example, a thermoplastic resin, and it is also preferable to use a polyester resin. Details of the polyester resin used in combination with the polycarbonate resin are as described above. The resin constituting each layer of this film preferably contains polycarbonate resin (A) as the main component, and the amount of polycarbonate resin (A) is, for example, 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass, based on the total amount of resin constituting each layer. Note that the total amount of resin referred to here does not include the impact resistance improving agent described later.

[0045] The layer structure of the laminated film is not particularly limited and may consist of two or more layers, but it is preferable to have a surface layer / middle layer / surface layer structure in which surface layers are provided on both sides of the middle layer. When it has a surface layer / middle layer / surface layer structure, it may consist of three layers, but an adhesive layer or the like may be provided between the surface layer and the middle layer as appropriate, or two or more middle layers may be provided, resulting in a structure of three or more layers.

[0046] (Thickness of this film) The thickness of this film is preferably 10 to 300 μm from the viewpoint of suitability for use in cards or passports. Preferably, the film thickness is 200 μm or less, more preferably 160 μm or less, and even more preferably 120 μm or less. By making the film relatively thin, a predetermined resin can be used for the film's constituent resin, and a predetermined amount of filler can be included, resulting in improved opacity compared to conventional films containing filler. Furthermore, by keeping the thickness below a certain level, it becomes easier to make cards and passports thinner, allowing for the use of other functional layers. Additionally, it becomes easier to add layers such as security functions to the transparent layer. Furthermore, the thickness of this film is preferably 15 μm or more, more preferably 20 μm or more, and even more preferably 40 μm or more, as a lower limit. By setting the thickness of this film to a certain level or higher, it becomes easier to ensure opacity. In addition, oversheets and core sheets can be constructed with a small number of film layers.

[0047] When this film has a surface layer / middle layer / surface layer structure, the thickness ratio of each surface layer to the middle layer (each surface layer / middle layer) is preferably 0.03 to 0.85, more preferably 0.05 to 0.7, even more preferably 0.1 to 0.5, and even more preferably 0.15 to 0.35. By keeping the thickness ratio within the above range, the surface layer and middle layer can each perform their appropriate functions more easily. For example, as described later, by including an impact-resistant improving agent in the surface layer and making its content greater than that of the middle layer, the effect of using the impact-resistant improving agent can be effectively exerted while suppressing the total amount of impact-resistant improving agent in the film as a whole.

[0048] (UV absorber) As described above, this film does not contain UV absorbers. If this film is a single-layer film, the resin layer of that single layer does not contain UV absorbers. Furthermore, if this film is a laminated film, the resin layers constituting each layer of the laminated film do not contain UV absorbers. Because this film does not contain UV absorbers, there is no risk of UV absorber bleed-out. In addition, since there is no need to use UV absorbers with special structures, its versatility can be increased.

[0049] UV absorbers are compounds that have an absorption peak in the ultraviolet region, and typically include benzotriazole UV absorbers, triazine UV absorbers such as hydroxyphenyltriazine UV absorbers, cyclic iminoester UV absorbers, benzophenone UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, oxanilide UV absorbers, malonic acid ester UV absorbers, and benzoxazinon UV absorbers.

[0050] (filling material) This film may contain a filler. By containing a filler, this film has lower light transmittance and can exhibit opacity. It is preferable that this form contains a filler in the film that constitutes the core sheet. The filler content in each film is preferably 10 to 50% by mass based on the total amount of each film. In this specification, this film having a filler content of 10% by mass or more is also called a filler-containing film. When the filler content is 10% by mass or more, the opacity can be sufficiently improved. On the other hand, when the content is 50% by mass or less, the filler can be properly filled even when the film is made into a thin film. Therefore, when the content is within the above range, for example, when this film is used as an inlet sheet such as an IC sheet, the inlet such as an IC chip can be sufficiently concealed by an inlet sheet of appropriate thickness. From the viewpoint of opacity, the content of the filler in this film is more preferably 15% by mass or more. Furthermore, from the viewpoint of appropriately improving opacity and maintaining good mechanical properties such as bendability, the content of the filler in this film is preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 28% by mass or less, and even more preferably 25% by mass or less.

[0051] Furthermore, this film may not contain fillers, or it may contain only a small amount of fillers. In this specification, this film which does not contain fillers, or contains only a small amount of fillers, is also called a low-filler film. The filler content in a low-filler film is preferably less than 10% by mass based on the total amount of the film, but from the viewpoint of ensuring transparency, it is preferably less than 5% by mass, and more preferably less than 1% by mass. A low-filler film is preferably a transparent film (transparent layer) that is substantially free of fillers and has transparency. A transparent film may contain fillers as long as transparency is ensured, for example, the filler content may be less than 5% by mass or less than 1% by mass relative to the total amount of the transparent film (transparent layer), but it is most preferably 0% by mass. In other words, it is most preferable that the transparent film does not contain fillers. When this film constitutes an oversheet, it is preferable that it be a low-filler film.

[0052] In this laminate, when the film constitutes the core sheet, it is preferable that it is a filler-containing film as described above. In this laminate, it is preferable that the film constituting the core sheet is a filler-containing film, and the film constituting the oversheet is a film with a small amount of filler, and more preferably that the film constituting the oversheet does not contain any filler. Furthermore, when the core sheet is composed of multiple resin films, it is preferable that all resin films in the core sheet are filler-containing films, but it is also possible that some are filler-containing films and the rest are low-filler films. For example, it is also preferable that the core sheet consists of three or more layers, with one or more low-filler films arranged between one or more filler-containing films.

[0053] The filler can be either an inorganic or organic filler, but examples of inorganic fillers include titanium dioxide, talc, mica, calcium carbonate, barium oxide, zinc oxide, carbon black, silica, lead titanate, potassium titanate, barium titanate, zircon oxide, magnesium oxide, calcium oxide, zinc sulfide, antimony oxide, zinc oxide, aluminum oxide, boron nitride, aluminum nitride, magnesium carbonate, and barium sulfate. Among these, at least one filler with a refractive index of 2 or higher is preferred, more preferably 2.2 or higher, and even more preferably 2.4 or higher. Examples of fillers with a refractive index of 2 or higher include titanium dioxide, lead titanate, potassium titanate, barium titanate, zircon oxide, magnesium oxide, calcium oxide, zinc sulfide, antimony oxide, zinc oxide, aluminum oxide, boron nitride, aluminum nitride, calcium carbonate, magnesium carbonate, and barium sulfate. Using a filler with a refractive index of 2 or higher improves opacity. Furthermore, the film can be colored white. From these viewpoints, titanium dioxide is more preferable as a filler. While titanium dioxide is not particularly limited, examples include rutile-type titanium dioxide and anatase-type titanium dioxide. The refractive index of the filler can be measured by the Becke line method.

[0054] The average particle size of the filler is not particularly limited, but is, for example, 0.01 μm or more and 1 μm or less, preferably 0.05 μm or more and 0.8 μm or less, more preferably 0.08 μm or more and 0.6 μm or less, even more preferably 0.1 μm or more and 0.5 μm or less, and even more preferably 0.12 μm or more and 0.4 μm or less. Note that the average particle size refers to the average primary particle size observed with a scanning electron microscope.

[0055] In the case of a laminated film, it is sufficient for at least one layer of the laminated film to contain a filler, but all layers may contain a filler. In a laminated film, the types of fillers contained in each layer may be different from each other, but it is preferable that they be the same. Therefore, it is preferable that all layers of the laminated film (for example, both surface layers and the middle layer) contain at least one filler selected from fillers with a refractive index of 2 or higher, and it is more preferable that titanium dioxide is included. The amount of filler in each layer should be adjusted so that the total amount of filler in the film as a whole falls within the above range, but it is preferable to distribute the filler evenly throughout each layer. By distributing the filler evenly throughout each layer, it is possible to prevent localized decreases in mechanical strength, such as bendability, and to improve the overall mechanical strength, such as bendability, of the film. It is also easier to appropriately improve the opacity. Therefore, the filler content in each layer (for example, both surface layers and the middle layer) should be in the range of 10 to 50% by mass, based on the mass of each layer. The preferred upper and lower limits for the filler content in each layer are the same as the preferred values ​​for the filler content in the entire film as described above.

[0056] (Impact-resistant additive) This film may contain an impact-resistant agent. By containing an impact-resistant agent, this film can mitigate the effects of external impacts such as bending and impact during actual use, making it easier to maintain good bending resistance. As mentioned above, even when a large amount of filler such as titanium dioxide is included, it is easier to maintain good bending resistance. Furthermore, it prevents the decrease in softening and fluidity during heating that can occur due to the use of specific resins such as polycarbonate resin (A) or the inclusion of large amounts of filler such as titanium dioxide, making it easier to maintain good processability. As a result, problems such as difficulty in embedding IC chips are less likely to occur.

[0057] Examples of impact-resistant modifiers include soft styrene resins and elastomers. The elastomer may be a core-shell type elastomer. The impact-resistant modifier may be used alone or in combination of two or more types. Among the above, core-shell type elastomers are preferred as impact resistance modifiers. By using core-shell type elastomers, impact resistance is further improved and bending resistance is further enhanced.

[0058] Examples of flexible styrene-based resins include block copolymers containing styrene polymer blocks and conjugated diene polymer blocks, and block copolymers containing styrene polymer blocks and acrylonitrile blocks. The styrene content in the flexible styrene resin is, for example, 5% by mass or more and 80% by mass or less, preferably 10% by mass or more and 50% by mass or less, and more preferably 15% by mass or more and 30% by mass or less. Having a styrene content within this range further improves the impact resistance effect.

[0059] As conjugated diene polymer blocks used in flexible styrene resins, homopolymers such as butadiene, isoprene, and 1,3-pentadiene, copolymers thereof, or copolymers containing monomers copolymerizable with conjugated diene monomers within the block can be used. Specific examples of flexible styrene-based resins include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), silicone-acrylic composite rubber-acrylonitrile-styrene copolymer (SAS), methyl methacrylate-maleic anhydride-styrene copolymer (SMM), acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene-acrylic rubber copolymer (ASA), and acrylonitrile-ethylene propylene rubber-styrene copolymer (AES). Specific products include the "Krayton D" series from Kraton Polymers, the "AR-100" series from Aron Kasei Co., Ltd., the "Dialac" series from UMG ABS, and the "Delpet" series from Asahi Kasei Chemicals. Furthermore, flexible styrene-based resins can also be used, such as the styrene-based elastomers described later, including the "Dynalon" series from JSR Corporation, the "Toughtech" series from Asahi Kasei Chemicals Corporation, and the "Hybral" series from Kuraray Corporation.

[0060] The block copolymer includes pure blocks, random blocks, tapered blocks, etc., and the form of copolymerization is not particularly limited. Furthermore, the block units themselves may consist of multiple repeating units. Specifically, in the case of styrene-butadiene block copolymers, the block units may be repeated multiple times, such as styrene-butadiene copolymer, styrene-butadiene-styrene block copolymer, and styrene-butadiene-styrene-butadiene block copolymer.

[0061] Furthermore, hydrogenated styrene-butadiene-styrene block copolymers (SEBS) and hydrogenated styrene-isoprene-styrene block copolymers (SEPS), in which some or all of the double bonds of the conjugated diene polymer blocks of SBS or SIS are hydrogenated, can also be used. Specific examples of such products include Asahi Kasei Chemicals' "ToughTec H" series and Kraton Polymers' "Kraton G" series.

[0062] It is also possible to impart polar functional groups to flexible styrene resins. Specific examples of polar functional groups include acid anhydride groups, carboxylic acid groups, carboxylic acid ester groups, carboxylic acid chloride groups, carboxylic acid amide groups, carboxylic acid bases, sulfonic acid groups, sulfonic acid ester groups, sulfonate chloride groups, sulfonic acid amide groups, sulfonic acid bases, epoxy groups, amino groups, imide groups, and oxazoline groups. Among these, it is preferable to impart acid anhydride groups or epoxy groups. Modified forms of SEBS and SEPS are preferred as soft styrene resins to which polar functional groups are added. Specifically, examples include maleic anhydride-modified SEBS, maleic anhydride-modified SEPS, epoxy-modified SEBS, and epoxy-modified SEPS. Specific products include the "ToughTec M" series from Asahi Kasei Chemicals, the "Dynalon" series from JSR Corporation, and the "Epofriend" series from Daicel Chemical Industries, Ltd.

[0063] Furthermore, the flexible styrene resin may also be a styrene elastomer containing an elastomer component. Specifically, among those mentioned above, examples include a styrene component and block copolymers of butadiene, isoprene, 1,3-pentadiene, etc., and modified versions of these or hydrogenated versions may also be used. More specifically, examples include SBS, SIS, SEBS, and SEPS.

[0064] The elastomer may be anything other than a styrene-based elastomer, and known examples include polyester-based elastomers, polyolefin-based elastomers, diene-based elastomers, acrylic-based elastomers, polyamide-based elastomers, polyurethane-based elastomers, fluorine-based elastomers, and silicone-based elastomers. The elastomer is generally a thermoplastic elastomer. Preferably, the elastomer is a polyester-based elastomer or one of the styrene-based elastomers described above.

[0065] Polyester elastomers are thermoplastic polyesters that have rubber properties at room temperature, and are preferably thermoplastic elastomers mainly composed of polyester block copolymers, and are preferably block copolymers having a high melting point, high crystallinity aromatic polyester as the hard segment and amorphous polyester or amorphous polyether as the soft segment. The soft segment content of the polyester elastomer is at least 20 to 95 mol% of the total segments, and in the case of a block copolymer of polybutylene terephthalate and polytetramethylene glycol (PTMG-PBT copolymer), it is 50 to 95 mol%. The preferred soft segment content is 50 to 90 mol%, particularly 60 to 85 mol%. Among these, polyester ether block copolymers, and especially PTMG-PBT copolymers, are preferred.

[0066] A core-shell type elastomer consists of an innermost layer (i.e., a core) and one or more outer layers (i.e., a shell) covering it. Preferably, the core-shell type elastomer is a core-shell type graft copolymer in which monomer components capable of graft copolymerization with respect to the core are graft copolymerized as the shell.

[0067] Core-shell type graft copolymers typically have a polymer component called a rubber component as the core. In core-shell type graft copolymers, it is preferable that the polymer component constituting the core and monomer components copolymerizable with this polymer component are graft copolymerized as the shell. The method for producing the core-shell type graft copolymer may be any of the following methods: bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization. The copolymerization method may be single-stage grafting or multi-stage grafting. However, commercially available core-shell type elastomers can usually be used as is. Examples of commercially available core-shell type elastomers will be given later.

[0068] Specific examples of polymer components forming the core include butadiene-based rubbers such as polybutadiene and styrene-butadiene copolymers, isoprene-based rubbers, acrylic-based rubbers such as polybutyl acrylate, poly(2-ethylhexyl acrylate), and butyl acrylate-2-ethylhexyl acrylate copolymers, silicone-based rubbers such as polyorganosiloxane rubber, silicone-acrylic composite rubbers such as butadiene-acrylic composite rubbers and IPN (Interpenetrating Polymer Network) type composite rubbers consisting of polyorganosiloxane rubber and polyalkyl acrylate rubber, ethylene-α-olefin-based rubbers such as ethylene-propylene copolymers, ethylene-butene copolymers, and ethylene-octene copolymers, ethylene-acrylic rubbers, and fluororubber. These may be used individually or in combination of two or more. Among these, at least one selected from butadiene-based rubbers, acrylic-based rubbers, silicone-based rubbers, and silicone-acrylic composite rubbers is preferred in terms of mechanical properties and surface appearance, and at least one selected from butadiene-based rubbers and silicone-acrylic composite rubbers is more preferred.

[0069] Specific examples of monomer components that can be graft copolymerized with the polymer component of the core and constitute the shell include aromatic vinyl compounds; vinyl cyanide compounds; (meth)acrylic compounds such as (meth)acrylic acid ester compounds, (meth)acrylic acid compounds, and epoxy group-containing (meth)acrylic acid ester compounds such as glycidyl (meth)acrylate; maleimide compounds such as maleimide, N-methylmaleimide, and N-phenylmaleimide; and α,β-unsaturated carboxylic acid compounds such as maleic acid, phthalic acid, and itaconic acid, and their anhydrides (e.g., maleic anhydride). These monomer components may be used individually or in combination of two or more. Among these, aromatic vinyl compounds, vinyl cyanide compounds, and (meth)acrylic compounds are preferred in terms of mechanical properties and surface appearance, and more preferably aromatic vinyl compounds, (meth)acrylic compounds, and especially (meth)acrylic acid ester compounds. Specific examples of aromatic vinyl compounds include styrene, α-methylstyrene, 1-vinylnaphthalene, 4-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-(phenylbutyl)styrene, or halogenated styrene, with styrene or α-methylstyrene being more preferred. Specific examples of (meth)acrylic acid ester compounds include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and octyl (meth)acrylate. Among these, methyl (meth)acrylate and ethyl (meth)acrylate are preferred because they are relatively easy to obtain, with methyl (meth)acrylate being more preferred. Note that "(meth)acrylic" is a general term for "acrylic" and "methacrylic".

[0070] As the core-shell type elastomer, a core-shell type graft copolymer is particularly preferred, which consists of a core made of at least one polymer component selected from butadiene rubber, acrylic rubber, silicone rubber, and silicone-acrylic composite rubber, and a shell formed by graft copolymerizing a (meth)acrylic compound such as a (meth)acrylic acid ester or an aromatic vinyl compound around the core. The content of the polymer component in the core of the core-shell type graft copolymer is preferably 40% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more. Furthermore, the total content of (meth)acrylic compounds (especially (meth)acrylic acid esters) and aromatic vinyl compounds in the shell of the core-shell type graft copolymer is preferably 30% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 70% by mass or more. In the shell, either the (meth)acrylic compound or the aromatic vinyl compound may be used alone, or they may be used in combination.

[0071] Preferred specific examples of core-shell type elastomers include methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), methyl methacrylate-butadiene copolymer (MB), methyl methacrylate-acrylic rubber copolymer (MA), methyl methacrylate-acrylic rubber-styrene copolymer (MAS), methyl methacrylate-acrylic / butadiene rubber copolymer, methyl methacrylate-acrylic / butadiene rubber-styrene copolymer, and methyl methacrylate-(acrylic / silicone composite rubber) copolymer.

[0072] Examples of commercially available core-shell type graft copolymers include "Paraloid EXL2602", "Paraloid EXL2603", "Paraloid EXL2690", "Paraloid EXL2691J", "Paraloid EXL2650J", "Paraloid EXL2655", "Paraloid EXL2311", "Paraloid EXL2313", "Paraloid EXL2315", "Paraloid KM330", "Paraloid KM336P", and "Paraloid KCZ201", all manufactured by Dow Chemical Japan. Examples include Mitsubishi Chemical's "Metablen C-223A," "Metablen E-901," "Metablen S-2001," "Metablen W-450A," "Metablen SRK-200," and "Metablen E-870A," and Kaneka's "Kaneace M-210," "Kaneace M-511," "Kaneace M-600," "Kaneace M-400," "Kaneace M-580," "Kaneace M-590," "Kaneace M-711," "Kaneace MR-01," and "Kaneace M-300." These impact-resistant modifiers, such as core-shell type graft copolymers, may be used individually or in combination of two or more types.

[0073] The impact-resistant modifier content in the entire film is preferably 1 to 30% by mass, based on the total film weight. A content of 1% by mass or more of the impact-resistant modifier moderately mitigates the effects of external impacts, improving properties such as bending resistance. It also prevents a decrease in softening and fluidity during film heating, which can occur due to the type of resin used or the amount of filler added, thus maintaining good processability. On the other hand, a content of 30% by mass or less allows the film to exhibit effects commensurate with its content. Furthermore, it prevents a decrease in various physical properties such as heat resistance of the film, and also prevents excessive fluidity during processing. From these viewpoints, the content of the impact-resistant improving agent in the entire film is more preferably 1.5% by mass or more, even more preferably 2% by mass or more, even more preferably 2.5% by mass or more, and particularly preferably 3% by mass or more. Furthermore, it is more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 10% by mass or less, particularly preferably 8% by mass or less, and most preferably 6% by mass or less.

[0074] In this laminate, it is sufficient for at least one of the main films to contain the impact-resistant modifier, but it is preferable that the main film constituting the oversheet contains the impact-resistant modifier. By including the impact-resistant modifier in the main film constituting the oversheet, the bending resistance and impact resistance of the entire laminate can be efficiently improved. The impact-resistant modifier may be included in the main film constituting one of the first and second oversheets, but it is preferable that it be included in the main film constituting both the first and second oversheets. The content of the impact-resistant modifier in the main film constituting the oversheet is as described above.

[0075] The resin film constituting the core sheet may or may not contain an impact-resistant modifier. As described above, if the film constituting the oversheet contains an impact-resistant modifier, the film constituting the core sheet should either not contain an impact-resistant modifier, or, if it does, the amount of impact-resistant modifier in the core sheet (mass%) should be less than the amount of impact-resistant modifier in the overcore sheet. In this way, by including a relatively large amount of impact-resistant modifier in the oversheet, it becomes easier to improve the bending resistance and impact resistance of the entire laminate without having to include a large amount of impact-resistant modifier in the entire laminate.

[0076] If the film is a laminated film and contains an impact-resistant agent, it is sufficient that at least one layer of the laminated film contains the impact-resistant agent. While all layers of the laminated film may contain the impact-resistant agent, it is preferable that at least the surface layer constituting the outermost layer of the film contains the impact-resistant agent. Therefore, in a laminated film having a surface layer / middle layer / surface layer structure, it is preferable that both surface layers contain the impact-resistant agent. Of course, the impact-resistant agent may also be contained in either the middle layer or both surface layers.

[0077] If the film further contains a filler, it is preferable that both surface layers contain a polycarbonate resin (A) and a filler, in addition to an impact-resistant modifier. On the other hand, if the film further contains a filler, the middle layer may contain polycarbonate resin (A) and a filler, but it is preferable that it does not contain an impact-resistant modifier, or if it does, it contains an impact-resistant modifier in a smaller amount than the two surface layers. In this way, by incorporating a relatively large amount of impact-resistant agent into both surface layers, it is possible to improve bending resistance and impact resistance, as well as processability, without having to increase the overall impact-resistant agent content of the film, and to make it easier to embed IC chips and other components. The impact-resistant additive content in each of the two surface layers is preferably 2% by mass or more, more preferably 4% by mass or more, even more preferably 6% by mass or more, even more preferably 8% by mass or more, and also preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, even more preferably 20% by mass or less, and particularly preferably 15% by mass or less. On the other hand, as described above, the amount of impact-resistant modifier in the middle layer is preferably less than the amount of impact-resistant modifier in each of the surface layers, based on the mass of each layer, preferably less than 4% by mass, more preferably less than 2% by mass, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and most preferably 0% by mass.

[0078] (Heat stabilizer / antioxidant (additive (X))) This film may contain at least one additive (X) selected from heat stabilizers and antioxidants. While this film may develop foaming and an appearance defect due to the large amount of filler it contains, for example, as described above, the inclusion of additive (X) can suppress foaming and improve the film's appearance. This film may contain either a heat stabilizer or an antioxidant, or both, as additive (X), but it is preferable to contain at least a heat stabilizer, and more preferably to use both a heat stabilizer and an antioxidant in combination.

[0079] (Heat stabilizer) Examples of heat stabilizers include phosphorus compounds. Known phosphorus compounds can be used. Specific examples include phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, polyphosphate and other phosphorus oxoacids, acidic pyrophosphate metal salts such as sodium acidic pyrophosphate, potassium acidic pyrophosphate, and calcium acidic pyrophosphate, phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate, organic phosphite compounds, organic phosphate compounds, and organic phosphonite compounds. In addition, metal salts of organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds may also be used.

[0080] Examples of organic phosphite compounds include triphenyl phosphite, tris(mononylphenyl) phosphite, tris(mononyl / dinonylphenyl) phosphite, tris(2,5-di-tert-butylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, tris[2,4-bis(1,1-dimethylpropyl)phenyl] phosphite, tris(mono / di-tert-butylphenyl) phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, and didecylmonophenyl phosphate. Examples of various phosphite esters include tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, 4,4'-butylidene-bis(3-methyl-6-t-butylphenyl-di-tridecyl phosphite), cyclic neopentanetetraylbis(2,6-di-t-butyl-4-methylphenyl phosphite), and 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane. Among these, trialkyl phosphites such as tristearyl phosphite are preferred.

[0081] Furthermore, as an organic phosphite compound, a phosphite ester having at least one oxetane group can also be used. Such an oxetane-containing phosphite ester may have one, two, or three oxetane groups. Examples of oxetane group-containing phosphite esters include tris[(3-ethyloxetan-3-yl)methyl]phosphite, bis[(3-ethyloxetan-3-yl)methyl]phosphite, mono[(3-ethyloxetan-3-yl)methyl]phosphite, tris[(3-pentyloxetan-3-yl)methyl]phosphite, bis[(3-pentyloxetan-3-yl)methyl]phosphite, and tris[(3-hexa Decyloxetan-3-yl)methyl]phosphite, bis[(3-hexadecyloxetan-3-yl)methyl]phosphite, tris[(3-phenyloxetan-3-yl)methyl]phosphite, bis[(3-phenyloxetan-3-yl)methyl]phosphite, tris[(3-p-tolyloxetan-3-yl)methyl]phosphite, bis[(3-p-tolyloxetan-3-yl)methyl]phosphite Tris[(3-benzyloxetan-3-yl)methyl]phosphite, bis[(3-benzyloxetan-3-yl)methyl]phosphite, phenylbis[(3-ethyloxetan-3-yl)methyl]phosphite, 2-phenoxyspiro(1,3,2-dioxaphospholinane-5,3'-oxetane), 3,3-bis[spiro(oxetane-3',5”-(1,3,2”-dioxa-2”-phospholinane)) These are [-oxymethyl]oxetane and P,P'-[(1-methylethylidene)-di-4,1-phenylene]-P,P,P',P'-tetrakis[(3-ethyl-3-oxetanyl)methyl]phosphite. Additionally, oxetane group-containing phosphite esters described in U.S. Patent No. 3,209,013 can be used as appropriate. Using oxetane group-containing phosphite esters makes it easier to increase the color intensity after the dye has developed.

[0082] The organic phosphate compound is preferably an organic phosphate ester compound or a metal salt of an organic phosphate ester compound, and the metal is more preferably at least one metal selected from Ia, IIa, IIb, IIIa and IIIb of the periodic table, with magnesium, barium, calcium, zinc and aluminum being even more preferred, and magnesium, calcium or zinc being particularly preferred. Furthermore, as organic phosphate ester compounds, acidic organic phosphate esters and their metal salts are preferred. Examples of acidic organic phosphate esters include dialkyl acid phosphates, monoalkyl acid phosphates, diaryl acid phosphates, and monoalkylmonoaryl acid phosphates. The alkyl group in the acidic organic phosphate ester is, for example, an alkyl group having 1 to 30 carbon atoms, but the number of carbon atoms is preferably 2 to 25, more preferably 6 to 23. The number of carbon atoms in the aryl group may be around 6 to 30.

[0083] Preferred specific examples of organophosphate ester compounds include, as acidic organophosphate esters, distearyl acid phosphate and monostearyl acid phosphate. Furthermore, examples of metal salts of acidic organophosphate esters include bis(distearyl acid phosphate) zinc salt, monostearyl acid phosphate zinc salt, tris(distearyl acid phosphate) aluminum salt, a salt of monostearyl acid phosphate and two monostearyl acid phosphate aluminum salts, monostearyl acid phosphate, and distearyl acid phosphate. Among these, distearyl acid phosphate and monostearyl acid phosphate are even more preferred.

[0084] Examples of organic phosphonite compounds include tetrakis(2,4-di-iso-propylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,4-di-n-butylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,3'-biphenylenediphosphonite, and tetrakis(2,4-di-tert-butylphenyl)-3,3'-biphenylenediphosphonite. Examples include tetrakis(2,6-di-iso-propylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,6-di-n-butylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,3'-biphenylenediphosphonite, and tetrakis(2,6-di-tert-butylphenyl)-3,3'-biphenylenediphosphonite.

[0085] Among the phosphorus compounds mentioned above, at least one selected from organic phosphite compounds and organic phosphate ester compounds is preferred from the viewpoint of improving thermal stability, inhibiting oxidation, and inhibiting foaming. Furthermore, it is preferable to use the organic phosphite compound in combination with an antioxidant described later, and more specifically, in combination with a phenolic antioxidant. By using it in combination with a phenolic antioxidant, foaming that occurs in this film can be effectively suppressed. In addition, it is possible to effectively suppress the decrease in molecular weight and yellowing of the resin during extrusion film formation, and to achieve both stability during extrusion film formation and long-term stability as a molded product.

[0086] Furthermore, the above-mentioned phosphorus-based compound can also be used as a transesterification inhibitor that can suppress the transesterification reaction between polyester resin and polycarbonate resin. Therefore, when this film contains both polyester resin and polycarbonate resin as resins, transesterification in this film can also be prevented. In addition, when this film contains either polyester resin or polycarbonate resin, transesterification with polycarbonate resin or polyester resin contained in layers adjacent to this film can also be prevented in a laminate containing this film. This film may use one of the above-mentioned heat stabilizers alone, or two or more types in combination.

[0087] (Antioxidant) Examples of antioxidants that can be used include phenolic antioxidants and sulfur-based antioxidants. Among these, phenolic antioxidants are preferred.

[0088] Examples of phenolic antioxidants include α-tocopherol, 4-methoxyphenol, 4-hydroxyphenyl (meth)acrylate, β-tocopherol, 2,6-di-tert-butylphenol, 2,6-di-tert-4-methoxyphenol, 2-tert-butyl-4-methoxyphenol, 2,4-dimethyl-6-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol (dibutylhydroxytoluene, BHT), and stearyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate. Among these, 2,6-di-tert-butyl-4-methylphenol (dibutylhydroxytoluene, BHT) is preferred.

[0089] Examples of sulfur-based antioxidants include thiodipropionic acid, dilauryl thiodipropionate, distearyl thiodipropionate, lauryl stearyl thiodipropionate, dimyristyl thiodipropionate, distearyl-β,β'-thiodibutyrate, thiobis(β-naphthol), thiobis(N-phenyl-β-naphthylamine), 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, and nickel dibutyldithiocarbamate.

[0090] In the case of a laminated film, the additive (X) may be included in at least one of the layers of the laminated film, but from the viewpoint of suppressing foaming, it is preferable to include it in the layer containing the filler. In the case of a laminated film, the filler may be included in all layers, but in that case, it is preferable to include the additive (X) in all layers as well. For example, if the film has a laminated structure of surface layer / middle layer / surface layer, it is preferable to include the additive (X) in both the middle layer and both surface layers.

[0091] Foaming is likely to occur in this film when a high molecular weight polycarbonate resin (A) is used as the resin. Therefore, when a high molecular weight polycarbonate resin is used as the resin in this film, it is preferable to include additive (X). Specifically, a high molecular weight polycarbonate resin is a polycarbonate resin with a mass average molecular weight of 58,000 or more, preferably a polycarbonate resin with a mass average molecular weight of 60,000 or more, and more preferably a polycarbonate resin with a mass average molecular weight of 63,000 to 120,000. Therefore, in the case of a laminated film, it is preferable to include additive (X) in the layer in which a high molecular weight polycarbonate resin is used as the resin.

[0092] On the other hand, in this film, if a low molecular weight polycarbonate resin (A) is used as the polycarbonate resin, foaming is less likely to occur, so it is not necessary to include additive (X). Similarly, in the case of a laminated film, the layer in which a low molecular weight polycarbonate resin (A) is used as the polycarbonate resin does not need to contain additive (X). Specifically, low molecular weight polycarbonate resin refers to polycarbonate resin with a mass-average molecular weight of less than 58,000, preferably polycarbonate resin with a mass-average molecular weight of 56,000 or less, and more preferably polycarbonate resin with a mass-average molecular weight of 20,000 or more and 54,000 or less.

[0093] The content of additive (X) in the entire film is preferably 0.01% by mass or more and 3% by mass or less based on the total amount of the film. By setting the content of additive (X) to 0.01% by mass or more, the effects of including additive (X) can be appropriately exerted, for example, foaming can be effectively suppressed. Alternatively, by setting it to 3% by mass or less, the effects commensurate with the content can be exerted. From these viewpoints, the content of additive (X) is more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.6% by mass or less.

[0094] In this film, as described above, a heat stabilizer and an antioxidant may be used in combination as additive (X). In this case, the mass ratio of the antioxidant to the heat stabilizer (antioxidant / heat stabilizer) is preferably 1 / 9 or more and 9 / 1 or less, more preferably 2 / 8 or more and 8 / 2 or less, and even more preferably 3 / 7 or more and 7 / 3 or less.

[0095] If the film is a laminated film, the types of additives (X) contained in each layer of the laminated film may be different from each other, or they may be the same. Also, in the case of a laminated film, the amount of additive (X) in each layer should be adjusted so that the total amount of additive (X) in the film as a whole falls within the above range. However, the preferred upper and lower limits for the amount of additive (X) in each layer containing additive (X), and the preferred range for the mass ratio (antioxidant / heat stabilizer), are the same as the preferred upper and lower limits for the amount of additive (X) in the film as a whole, and the preferred range for the mass ratio (antioxidant / heat stabilizer), as described above.

[0096] (Antistatic agent) This film may contain an antistatic agent. The inclusion of an antistatic agent tends to improve handling by suppressing static charge buildup during transport and when layered with other films, and by reducing adhesion to press plates during heat pressing. Furthermore, the lower surface resistivity of the film reduces static electricity generation when unwinding the film from the film roll, effectively preventing sparks that could scratch the film surface, and preventing the film from meandering or skewing during feeding, resulting in misalignment, twisting, wrinkles, etc. Therefore, handling and processability are improved. In addition, lower surface resistivity reduces the likelihood of airborne dust being attracted by static electricity and adhering to the film surface, thus reducing the risk of foreign matter contamination in the resulting laminated films, cards, passports, and other products, thus improving dust resistance. Examples of antistatic agents include low-molecular-weight antistatic agents and high-molecular-weight antistatic agents. These may be ion-conducting or electron-conducting types.

[0097] Examples of low-molecular-weight antistatic agents include anionic antistatic agents, cationic antistatic agents, nonionic antistatic agents, amphoteric antistatic agents, complex compounds, metal alkoxides such as alkoxysilanes, alkoxytitanium, and alkoxyzirconium, and their derivatives, and coated silica. The amphoteric antistatic agent may be of the betaine type, but may also be of a different type, and may be any antistatic agent composed of a cation and anion, and may also be an ionic liquid. The polymeric antistatic agent may be various polymers, such as vinyl copolymers containing metal sulfonic acid salts, such as alkyl sulfonic acid metal salts or alkylbenzene sulfonic acid metal salts, within the molecule, or it may be a betaine type. Polyamide elastomers, polyester elastomers, etc., can also be used. Antistatic agents can be used individually or in combination of two or more types.

[0098] Among the above, antistatic agents composed of a cation and anion are preferred. Specifically, antistatic agents composed of an anion selected from a sulfonimide anion containing a fluorine atom and a sulfonate anion containing a fluorine atom, and a cation selected from a phosphonium cation, an ammonium cation, an imidazolium cation, and a pyridinium cation are preferred. Antistatic agents composed of cations and anions are preferably ionic liquids. Ionic liquids inherently possess high conductivity and are liquids at around room temperature, resulting in excellent dispersibility and superior antistatic performance. Furthermore, they exhibit excellent heat resistance, allowing for the suppression of property degradation due to thermal decomposition of the antistatic agent while providing excellent antistatic performance. An ionic liquid is defined as a compound consisting solely of ions with a melting point of 100°C or lower.

[0099] The anion selected from the above-mentioned sulfonimide anions and sulfonate anions containing a fluorine atom preferably includes an anion selected from perfluoroalkyl sulfonimide anions and perfluoroalkyl sulfonate anions. The anion tends to have improved transferability to the surface of the ionic liquid in the film by containing a fluorine atom, particularly a perfluoroalkyl group. Therefore, it becomes possible to impart high antistatic performance with a lower amount of additive.

[0100] As the antistatic agent composed of the anion and cation described above, an antistatic agent represented by the following formula (4) is preferred. [(R 11 )4P + ·(R 12 SO2)(R 12 SO2)N - (4) (In the above formula (4), R 11 each independently represents a hydrocarbon group, and R 12 each independently represents a fluorine atom-containing hydrocarbon group.)

[0101] In the formula (4), R 11 each is independently preferably selected from a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkenyl group, and an aryl group; a linear or branched alkyl group is more preferred, and a linear alkyl group is further preferred. Each R 11 may optionally have a substituent, but it is preferred that R<1> does not have a substituent. R 11 The number of carbon atoms constituting the hydrocarbon group of R<1> is, for example, 1 to 20, preferably 1 to 12, more preferably 1 to 8, further preferably 1 to 6, and still more preferably 1 to 4. As described above, the hydrocarbon group is preferably an alkyl group, and therefore, R 11 is most preferably an alkyl group having 1 to 4 carbon atoms. A plurality of R 11 in one molecule may be the same as or different from each other. When a plurality of R 11 in one molecule are different, it is preferred that the three R 11 have the same number of carbon atoms constituting their hydrocarbon groups, and the other one R 11 has a different number of carbon atoms constituting its hydrocarbon group. The number of carbon atoms constituting the hydrocarbon groups of the three R 11 is, for example, 9 or less, preferably 4 to 9, more preferably 5 to 8, and further preferably 6 to 7. The other one R 11The number of carbon atoms constituting the hydrocarbon group is, for example, 10 or more, preferably 10 to 18, more preferably 11 to 16, and even more preferably 12 to 14. The hydrocarbon group is preferably an alkyl group as described above.

[0102] R 12 Preferably, each is independently selected from a linear, branched, or cyclic alkyl group containing a fluorine atom, a linear, branched, or cyclic alkenyl group containing a fluorine atom, and an aryl group containing a fluorine atom, with a linear or branched alkyl group containing a fluorine atom being more preferred, and a linear alkyl group containing a fluorine atom being even more preferred. Each R 12 In this, the number of carbon atoms constituting the hydrocarbon group is preferably 1 to 10, more preferably 1 to 6, even more preferably 1 to 4, and still more preferably 1 to 3. More specifically, R 12 Each of these groups is preferably a perfluorohydrocarbon group, more preferably a perfluoroalkyl group, even more preferably a perfluoromethyl group or a perfluoroethyl group, and even more preferably a perfluoromethyl group. Multiple Rs within a single molecule 12 They may be the same as each other, or they may be different.

[0103] The antistatic agent represented by formula (4) is preferably a compound represented by the following formula (5). [ka]

[0104] In a single-layer film, it is preferable that the antistatic agent be contained in the single layer. In a laminated film, the antistatic agent only needs to be contained in at least one layer of the laminated film, or it may be contained in all layers. However, the antistatic agent is preferably contained in the surface layer. Therefore, in a laminated film having a surface layer / middle layer / surface layer structure, it is preferable that both surface layers contain the antistatic agent. By containing the antistatic agent in both surface layers, it becomes easier to obtain the above-mentioned effects, such as improved handling performance, by effectively suppressing static charge in the film.

[0105] The content of the antistatic agent in each layer containing the antistatic agent is preferably 0.1% to 3% by mass, more preferably 0.2% to 2.5% by mass, even more preferably 0.3% to 2% by mass, and even more preferably 0.4% to 1.5% by mass, if the antistatic agent is composed of cations and anions. If it is another type of antistatic agent, the content of the antistatic agent in each layer is preferably 0.1% to 5% by mass, more preferably 0.2% to 4% by mass, even more preferably 0.4% to 3% by mass, and even more preferably 0.5% to 2% by mass.

[0106] (Laser colorant) When this film is used to form a laser marking sheet, it is preferable to include a laser coloring agent. A laser marking sheet is a sheet on which personal information is printed by laser printing. Personal information is information used to identify the passport or cardholder, such as name, personal ID, and card number. It is preferable that this film containing a laser coloring agent forms an oversheet. The laser colorant is not particularly limited as long as it has the function of generating heat when irradiated with a laser beam. It may be a so-called self-coloring colorant that emits color itself when irradiated with laser light, or it may not emit color itself. By generating heat, the laser colorant can promote the carbonization of the surrounding forming material, thereby improving laser printability. Furthermore, if a self-coloring laser colorant is used, the coloring of the laser colorant and the coloring of the carbides produced by the carbonization of the forming material synergistically result in printing with a deep color and excellent visibility. When the laser colorant emits color, the color is not particularly limited, but from the viewpoint of visibility, it is preferable to use a laser colorant that can emit dark colors including black, navy blue, and brown.

[0107] The laser colorant may be a metal oxide or a compound other than a metal oxide. The metal oxide is not limited as long as it has a laser coloring effect, and examples include iron oxide, copper oxide, zinc oxide, tin oxide, cobalt oxide, nickel oxide, bismuth oxide, indium oxide, antimony oxide, tungsten oxide, neodymium oxide, mica, hydrotalcite, montmorillonite, and smectite. Furthermore, laser colorants other than metal oxides may also be used, including metals such as iron, copper, zinc, tin, gold, silver, cobalt, nickel, bismuth, antimony, and aluminum; metal salts such as iron chloride, iron nitrate, iron phosphate, copper chloride, copper nitrate, copper phosphate, zinc chloride, zinc nitrate, zinc phosphate, nickel chloride, nickel nitrate, bismuth subcarbonate, and bismuth nitrate; metal hydroxides such as magnesium hydroxide, lanthanum hydroxide, nickel hydroxide, and bismuth hydroxide; and metal borides such as zirconium boride, titanium boride, and lanthanum boride. Among metal borides, hexaborides have near-infrared absorption ability, and lanthanum hexaboride is preferred because it has excellent laser light absorption efficiency. In addition, dyes such as leuco dyes such as fluorane, phenothiazine, spiropyran, triphenyl metaphthalide, and rhodamine lactam, as well as carbon black, can also be used. As the laser colorant, it is preferable to use bismuth oxide or a bismuth-based metal oxide such as a metal oxide containing bismuth and at least one metal selected from Zn, Ti, Al, Zr, Sr, Nd, and Nb. Laser colorants may be used individually or in combination of two or more types.

[0108] The film contains a laser colorant, and if it consists of a single resin layer, it is preferable that one of the resin layers contains the laser colorant. In the case of a laminated film, the laser marking sheet may have a structure in which, for example, surface layers are provided on both sides of the middle layer, and the laser colorant may be contained in the middle layer. The laser marking sheet typically consists of a transparent layer. The content ratio of the laser colorant in this film should be set appropriately to ensure good laser printability, but based on the total amount of the film, for example, it is 0.005 to 3% by mass, preferably 0.01 to 2% by mass, more preferably 0.02 to 1% by mass, and even more preferably 0.02 to 0.5% by mass.

[0109] (Other ingredients) This film may contain additives other than those listed above (other additives) that are commonly used in card or passport films. Examples of other additives include lubricants, process stabilizers, light stabilizers, matting agents, processing aids, metal deactivators, residual polymerization catalyst deactivators, antibacterial and antifungal agents, antiviral agents, and flame retardants. If this film is a laminated film, at least one of the multiple layers constituting the laminated film may contain at least one of the other additives listed above, or all layers may contain at least one of the other additives.

[0110] (Method of manufacturing this film) This film can be manufactured by known methods, but it is preferable to obtain a resin composition for forming this film and then make the resin composition into a film. The resin composition may be obtained, for example, by mixing a resin containing polycarbonate resin (A) and the raw materials constituting the resin composition, such as optionally added fillers, impact modifiers, additives (X), antistatic agents, laser colorants, and other components. The raw materials are best mixed by melt-kneading while heating in an extruder, plast mill, etc., but the raw materials constituting the resin composition may also be used as is after being dry-blended in a tumbler or the like. The method for forming the resin composition into a film is not particularly limited, and may include press molding or extrusion molding, but extrusion molding is preferred in terms of productivity and cost.

[0111] Furthermore, if the film is a laminated film, resin compositions for forming each layer may be prepared, and multiple resin layers may be laminated by a known lamination method while forming each resin layer from each resin composition. Alternatively, a resin composition for forming another resin layer may be melt-extruded and laminated onto a resin film formed from any of the resin compositions. A multilayer structure may also be formed by co-extrusion. From the viewpoint of productivity and cost, it is preferable to adopt the co-extrusion method. In a laminated film, the resin composition for forming each layer is preferably obtained by mixing components for forming each layer according to the composition of each layer. For example, in a laminated film having a surface layer / middle layer / surface layer structure, a resin composition for the surface layer containing at least a resin and a filler for forming the surface layer, and a resin composition for the middle layer containing at least a resin and a filler for forming the middle layer are prepared, and the laminated film is formed using these resin compositions.

[0112] <Details of the card or passport laminate> (Color change (ΔE)) The laminate for cards or passports of the present invention (this laminate) has passed weathering exposure tests at 63°C, 50% RH, and an ultraviolet irradiation intensity of 180 W / cm². 2Under these conditions, the color change (ΔE) of the laminate, expressed by the following formula (D), before and after 100 hours of irradiation, is 10.0 or less. If ΔE is greater than 10, the UV resistance will be low, and the laminate will be more prone to color changes over time, for example, when used outdoors. ΔE*={(L*AL*B) 2 +(a*Aa*B) 2 +(b*Ab*B) 2} 1 / 2 ...(D) (In formula (D), L*A, a*A, and b*A represent the color tones of the laminate after UV irradiation, while L*B, a*B, and b*B represent the color tones of the laminate before UV irradiation.)

[0113] Regarding ΔE, it is preferably 6.0 or less, more preferably 4.0 or less, and especially preferably 2.0 or less. The lower limit of ΔE is not particularly limited and is acceptable as long as it is 0 or greater. Furthermore, the b* value (i.e., b*A) after 100 hours of irradiation serves as an indicator of yellowness, and is preferably 4.0 or less, more preferably 2.0 or less, particularly 0.0 or less, and especially -1.0 or less. Note that the b* value after 100 hours of irradiation is not particularly limited, but for example, it may be -25 or more, or -10 or more.

[0114] In this laminate, the core sheet is preferably composed of two or more layers of resin film (the main film), and more preferably composed of three or more layers of resin film (the main film). Although this laminate consists of multiple resin films, the core sheet is preferably composed of one layer of resin film (the main film) or multiple layers of resin film (the main film) that are continuous in the lamination direction, from among the resin films that make up the laminate other than the outermost layer. Furthermore, the number of layers of resin film that make up the core sheet is not particularly limited; for example, it may be 20 layers or less, but from a practical standpoint, 10 layers or less is preferred.

[0115] The first and second oversheets may each be composed of one resin film (main film) that constitutes the outermost layer of the main laminate, or a plurality of resin films (main film) that are continuous in the lamination direction and include the resin film (main film). The first and second oversheets are preferably composed of one or more resin films (main film), and more preferably composed of two or more resin films (main film).

[0116] Referring to the drawings, as an example, the laminate 10 may comprise, as shown in Figure 1, a plurality of resin films (main films) 11A, 11B, and 11C constituting a core sheet, and a plurality of resin films (main films) 12A, 12B and a plurality of resin films (main films) 13B, 13A provided on both sides of the core sheet (i.e., resin films 11A, 11B, and 11C), each constituting a first and second oversheet. In this case, the number of layers of resin films (main films) constituting the core sheet was 3, the number of layers of resin films (main films) constituting the first oversheet was 2, and the number of layers of resin films (main films) constituting the second oversheet was 2. However, the number of layers of resin films (main films) constituting the core sheet, the first oversheet, and the second oversheet are not particularly limited, and the resin film constituting the core sheet may be 1 layer, 2 layers, or 4 or more layers. Furthermore, the number of layers of resin film constituting the oversheet on each side of the core sheet may be one layer or three or more layers. Therefore, as an example of having the fewest number of resin film layers, the laminate 10A may also be a laminate 10A, as shown in Figure 2, comprising a core sheet composed of one layer of resin film (main film) 11, and first and second oversheets composed of one layer of resin film (main film) 12 and 13 on both sides thereof.

[0117] In this laminate, it is preferable that the core sheet and each oversheet are heat-sealed to each other. In this laminate, as described above, the heat sealing of each sheet makes the color tone more susceptible to change due to subsequent UV irradiation caused by the thermal history during heat sealing. However, in the present invention, as described above, each film contains polycarbonate resin (A), so the color tone is less likely to change even without containing a UV absorber.

[0118] Furthermore, the core sheet may be composed of two or more layers of resin film (main film), in which case it is preferable that adjacent resin films (main film) constituting the core sheet are heat-sealed together. Similarly, the first and second oversheets may each be composed of two or more layers of resin film (main film), in which case it is preferable that adjacent resin films (main film) in the first and second oversheets are heat-sealed together. In this laminate, when adjacent resin films (main film) constituting each sheet are heat-sealed together, the color tone becomes more susceptible to change due to subsequent ultraviolet irradiation caused by the thermal history during heat sealing. However, as described above, since each main film contains polycarbonate resin (A), the color tone becomes less susceptible to change even without the inclusion of an ultraviolet absorber.

[0119] The first and second oversheets are preferably laminated directly onto the core sheet, as shown in Figures 1 and 2, and more preferably directly laminated and heat-sealed. However, the first and second oversheets do not need to be laminated directly onto the core sheet; they may be laminated onto the core sheet via other layers. Here, the other layers may be resin layers or adhesive layers made of materials other than this film. The resin layers or adhesive layers making up the other layers may be made of resin films other than this film, or of known adhesives. Examples of resin layers include resin films that make up laser sheets or printed sheets, and hologram layers. Furthermore, the first and second oversheets are preferably laminated to the core sheet by heat fusion, even if other layers are interposed. In this case, the other layers can be heat-fused to the resin film constituting the oversheet and the main film constituting the core sheet. Thus, the resin used in the resin film other than the main film, which is used as another layer for heat fusion, is preferably a thermoplastic resin.

[0120] Furthermore, other resin films may be the same as the above-described film, except that they satisfy at least one of the following conditions: they use a resin other than polycarbonate resin (A) as the resin, and they contain an ultraviolet absorber. The resin used in other resin films is not particularly limited and may be polyester resin, polycarbonate resin, or a combination of both. However, for example, when constructing a laser marking sheet, it is preferable to use polycarbonate resin from the viewpoint of laser printability. Details of the polyester resin are as described above. In addition, as the polycarbonate resin, the above-described polycarbonate resin (A) may be used, or a polycarbonate resin other than polycarbonate resin (A) may be used. As a polycarbonate resin other than polycarbonate resin (A), for example, a bisphenol-based polycarbonate using bisphenol such as bisphenol A as the dihydroxy compound may be used. Bisphenol-based polycarbonates generally contain 50 mol% or more, preferably 70 mol% or more, of structural units derived from bisphenols among structural units derived from dihydroxy compounds, and are more preferably bisphenol A-based homopolycarbonates.

[0121] (Method of manufacturing this laminate) In the present invention, the manufacturing method is not limited as long as the laminate is obtained by laminating multiple resin films, but it is preferable to manufacture the laminate by overlapping the resin film constituting the core sheet and the resin film constituting the oversheet, heat-pressing them together by press molding, and heat-fusing the resin films together. When manufacturing by press molding, all the resin films constituting the laminate may be stacked and all the resin films may be heat-pressed together in a single press. Alternatively, some of the resin films constituting the laminate may be heat-pressed together by press to obtain a laminate that constitutes part of the laminate, and this laminate may be heat-pressed together with other resin films or another laminate to manufacture the product. Furthermore, it is not necessary to manufacture this laminate by heat fusion for all layers; some resin films may be fused by heat compression, and some resin films may be bonded by means other than heat fusion. An example of a means other than heat fusion is the use of an adhesive. Press forming is preferably carried out by hot pressing at a temperature of 160°C or lower, more preferably 120 to 160°C, and even more preferably 130 to 150°C. This laminate may have layers other than the resin film (this film) that constitutes the core sheet and the resin film (this film) that constitutes the oversheet (other layers), and these other layers or other layers and this film may be bonded together by fusion or other means.

[0122] <Card or passport> This laminate is a laminate used for cards or passports. That is, a card or passport according to the present invention comprises the above-described laminate. Examples of cards include IC cards, magnetic cards, driver's licenses, residence cards, qualification certificates, employee IDs, student IDs, My Number cards, seal registration certificates, vehicle registration certificates, tag cards, prepaid cards, cash cards, credit cards, ETC cards, SIM cards, B-CAS cards, and the like.

[0123] A card or passport (more specifically, a passport data page) will comprise a core sheet contained within this laminate. In addition to the core sheet, the card or passport data page may also comprise at least one of a laser marking sheet and a protective sheet. For example, at least one of the laser marking sheet and the protective sheet may be composed of the oversheet described above. The passport data pages or cards may be manufactured by die-cutting or similar processes on the laminate, or on a laminate obtained by pressing and heat-fusing one or more additional sheets onto the laminate as needed. Alternatively, instead of heat-fusing, adhesives may be used to bond the sheets to each other or to the laminate.

[0124] Preferably, at least a portion of this laminate constitutes an inlet sheet, which incorporates an inlet such as an IC chip or an antenna, and more preferably constitutes an IC sheet, which incorporates an IC chip. Preferably, the inlet sheet is made of the core sheet described above.

[0125] Because this resin film (this film) contains a filler, it can achieve high opacity. When used as an inlet sheet for IC sheets, it can properly conceal IC chips, antennas, and other inlets even when the inlet sheet is thin. Furthermore, as mentioned above, by containing an impact-resistant modifier, this film can prevent softening and a decrease in fluidity during heating, which can occur due to excessive filling, and maintain good processability. Therefore, by containing an impact-resistant modifier in addition to the filling, this film is less likely to cause problems such as difficulty in embedding IC chips, even when used in inlet sheets. When using this film as an inlet sheet for IC sheets, it is preferable to laminate two or more layers, more preferably three or more layers, and even more preferably four or more layers. By laminating two or more layers of this film to form an inlet sheet, there is an advantage in that it becomes easier to embed inlets such as IC chips and antennas compared to an inlet sheet made of a single layer of this film. In addition, although IC chips and the like are available in various thicknesses, by using an inlet sheet configuration such as that shown in Figure 3, which will be explained later, it is possible to adjust the thickness of the inner film according to the thickness of the IC chip, etc. Furthermore, since the film on both surfaces of the inlet sheet is positioned above and below the IC chip, etc., there is an advantage in that the inlets of IC chips, etc. can be properly concealed.

[0126] Furthermore, if this film is laminated in two or more layers to form an inlet sheet and also used as the core sheet as described above, there is an advantage in that it is easier to adjust the overall thickness of the product when laminating it with the resin film that constitutes the oversheet, more specifically, the resin film that constitutes the laser marking sheet or protective sheet, etc., to create actual products such as cards and passports.

[0127] Figure 3 shows an example of an IC sheet as an inlet sheet that constitutes at least a part of the laminate. As shown in Figure 3, the IC sheet (inlet sheet) 16 is made by laminating multiple resin films 15 so that an inlet such as an IC chip 17 is embedded inside. For example, it is preferable to laminate the inlet between two or more layers of resin films 15 and integrate them by heat fusion or the like. In Figure 3, the IC sheet (inlet sheet) 16 is formed from four layers of resin film 15, but the resin film 15 can consist of two or more layers. Also, although only the IC chip 17 is shown as the inlet, it may have other inlets such as an antenna. Furthermore, at least one of the multiple resin films 15 may be appropriately cut to form a hollow or notch according to the shape of the inlet (e.g., IC chip 17) so that the inlet can be properly embedded inside. The multiple resin films may then be laminated and integrated after the inlet is placed in the hollow or notch. For example, in the example shown in Figure 3, the two innermost resin films 15 of the four layers of resin film 15 may have hollow sections for arranging the IC chip 17.

[0128] Each resin film 15 is preferably the film described above. Furthermore, by incorporating a filler into the film, as described above, the opacity is enhanced, and by using the filler-containing film as part or all of the inlet sheet, the inlet such as the IC chip 17 can be properly concealed. In particular, it is preferable that at least the resin films on both surfaces of the inlet sheet be filler-containing films. On the other hand, the inner resin film (for example, the two resin films forming the hollow portion in Figure 3) is preferably a film with a small amount of filler, and more preferably a transparent film (transparent layer) that is substantially free of filler. Details of the transparent film that is substantially free of filler are as described above.

[0129] The thickness of the inlet sheet (IC sheet) is not particularly limited, but is preferably 100 μm to 500 μm, more preferably 200 μm to 460 μm, even more preferably 250 μm to 440 μm, and even more preferably 280 μm to 420 μm. By making the inlet sheet thickness 100 μm or more, the inlet such as the IC chip can be properly concealed by the inlet sheet. Furthermore, by making it 500 μm or less, it becomes easier to add various functions to the data pages and cards by making the parts other than the inlet sheet thicker without making the passport data pages and cards unnecessarily thick.

[0130] In a passport or card, the inlet sheet described above is often used as the core sheet, and an oversheet is laminated on one or both sides thereof. For example, a laser marking sheet may be further laminated. The laser marking sheet is preferably laminated as an oversheet. The laser marking sheet is preferably composed of one layer of resin film, but may be composed of two or more layers of resin film. A protective sheet may also be laminated as an oversheet. Both the laser marking sheet and the oversheet may constitute the oversheet. While it is preferable that the resin film constituting the laser marking sheet or protective sheet is this film as described above, other films may also be used. Other resin films are as described above.

[0131] A card or passport may have a printed sheet. The printed sheet may be composed of a part of the laminate, for example, a part or all of the core sheet. The printed sheet is a sheet on which fixed information is printed before being laminated and integrated with other sheets. The fixed information is information other than the personal information described above, and is information that does not change even if the card or passport is different. The fixed information may be printed on the printed sheet with a known ink such as a photocuring or thermocuring ink. The printed sheet is a colored sheet and may consist of a single layer of resin film or a laminated film consisting of multiple resin layers. The printed sheet is, for example, a sheet placed on the outside of the inlet sheet. The printed sheet may then form the core sheet of the laminate together with the inlet sheet. If a laser marking sheet is provided, the printed sheet may be placed between the inlet sheet and the laser marking sheet.

[0132] The printing sheet used for passports or cards is preferably made of the filler-containing film described above. Since the printing sheet is made of a filler-containing film, it has high opacity, and by being placed outside the inlet sheet, it can conceal the inlet even when the inlet sheet cannot sufficiently conceal it. In addition, when a laser marking sheet is provided, the laser marking sheet may be laminated on top of the printing sheet, in which case the laser printability of the laser marking sheet can be improved.

[0133] The protective sheet used in passports or cards generally constitutes the outermost layer on the data pages of the card or passport. Therefore, when laser marking sheets or printed sheets are laminated, the protective sheet is preferably laminated on the outside of these. When the protective sheet is laminated on the outside of the laser marking sheet, it suppresses the so-called "blistering" that occurs when the laser-printed area is irradiated with laser light. The protective sheet may consist of a single layer of resin film or a multilayer laminate consisting of multiple films. The protective sheet is made of this film and preferably consists of at least a part of the oversheet. Furthermore, it is preferable that the protective sheet is made of the above-mentioned small amount of filler film and typically constitutes a transparent layer. Furthermore, the protective sheet may be made of a resin film other than this film. The resin films other than this film are as described above.

[0134] The stacked structure of the data pages or card in a passport is not particularly limited, but may have one of the following stacked structures, for example (1) to (6). (1) Protective sheet / Laser marking sheet / IC sheet (inlet sheet) / Printed sheet / Protective sheet (2) Protective sheet / Laser marking sheet / IC sheet (inlet sheet) / Laser marking sheet / Protective sheet (3) Protective sheet / Laser marking sheet / Printed sheet / IC sheet (inlet sheet) / Printed sheet / Laser marking sheet / Protective sheet (4) Protective sheet / Laser marking sheet / Printed sheet / IC sheet (Inlet sheet) / Laser marking sheet / Protective sheet (5) Protective sheet / Laser marking sheet / IC sheet (inlet sheet) / Protective sheet (6) Protective sheets / Laser marking sheets / Printed sheets / IC sheets (inlet sheets) / Protective sheets The passport or card preferably has the laminated structure of (1) above. In the laminated structures of (1) to (6) above, protective sheets are provided on both outermost surfaces, but one or both of the protective sheets may be omitted as appropriate. Furthermore, although not particularly limited, the above configuration may include either or both the printed sheet and the IC sheet (inlet sheet) forming the core sheet, and either or both the protective sheet and the laser marking sheet forming the oversheet.

[0135] Furthermore, the data pages and cards of the passport may be equipped with security features such as lenticular printing, hologram printing, and security threads, which may be appropriately placed, for example, between the protective sheet and the laser marking sheet, between the laser marking sheet and the printing sheet, or between the laser marking sheet and the inlet sheet.

[0136] Furthermore, a hinge sheet may be provided in the passport. The hinge sheet is a sheet that plays a role in securely binding the data pages together with the passport cover and other visa sheets, etc. The hinge sheet may be positioned to protrude from the inlet sheet, for example, so as to be connected to the inlet sheet that constitutes the core sheet. Alternatively, the hinge sheet may be placed, for example, between the inlet sheet and the printing sheet, laser marking sheet, or protective sheet, and laminated within the data pages so that a portion of it protrudes from the inlet sheet.

[0137] Furthermore, the laminate may have a clear window. The clear window is provided in cards and the like for anti-counterfeiting purposes and aesthetic purposes, and constitutes a transparent window portion introduced into a part of the card or the like. The clear window may be provided as an opening in at least one of the films constituting the laminate. Films with clear windows typically require high opacity to conceal inlets, such as IC chips, located in the internal layers of the film. Furthermore, films with clear windows are desirable to be thin to allow resin from other resin layers (resin films) to flow into the openings and properly fill them. Therefore, thin films containing fillers with good opacity are suitable for use as films with clear windows.

[0138] Figure 4 shows an example of a laminated structure of a card with a clear window. As shown in Figure 4, in the laminated structure 30 that constitutes a card, the resin film 20 having a clear window (opening) 21 is provided in two layers, and a transparent film is provided so as to sandwich each resin film 20. In the laminated structure 30 shown in Figure 4, the transparent film 22, resin film 20, transparent film 23, resin film 20, and transparent film 24 are laminated in this order. Each resin film 20, 20 and transparent films 22, 23, and 24 are preferably made of this film. Furthermore, each resin film 20, 20 is preferably made of a filler-containing film, and the transparent films 22, 23, and 24 are preferably made of a small amount of filler film. In addition, in the laminated structure 30, the resin films 20, 20 and transparent film 23 constitute the core sheet, and the transparent films 22 and 24 constitute the oversheet. The laminated structure 30 may be manufactured, as described in the manufacturing method of this laminate, by, for example, pressing together the transparent film 22, resin film 20, transparent film 23, resin film 20, and transparent film 24 using a heat press or the like, and then integrating them by heat fusion. When these transparent films 22, 23, 24 and resin films 20, 20 are pressed together and integrated, the resin constituting the transparent films 22, 23, 24 flows into the openings 21 of the resin films 20, 20, and the openings 21 are filled with resin.

[0139] In the laminated structure 30, the transparent film 23 placed between the resin films 20, 20 is also called a transparent core sheet and may be composed of multiple transparent films. Furthermore, the laminate between one main film 20 and the other main film 20 may partially or entirely constitute an inlet sheet. The transparent films 22 and 24 placed on the outside of the resin film 20 may constitute a protective sheet, and additional resin films that constitute a protective sheet, laser marking sheet, etc., may be placed on the outside of the transparent films 22 and 24 as appropriate. Details of the protective sheet and laser marking sheet are as described above. The sheets placed on the outside of the protective sheet, laser marking sheet, etc., may also constitute an oversheet together with the transparent films 22 and 24. Furthermore, in the laminated structure 30 shown in Figure 4, the resin film 20 having a clear window (opening) is shown to be provided in two layers, but the resin film having a clear window (opening) may be one layer or three or more layers. However, in order to allow transparent resin to flow into the opening, the resin film having a clear window (opening) is preferably sandwiched between transparent films (transparent layers) in the laminated structure.

[0140] In the above explanation, this film has been specifically described by referring to examples of its use in inlet sheets and films with clear windows, but it may be used in other ways as well. [Examples]

[0141] Examples and comparative examples are shown below, but these do not limit the present invention in any way.

[0142] The evaluation method is as follows: Color change (ΔE) In a weathering exposure test using a xenon weather meter, the temperature was 63°C, 50% RH, and the UV irradiation intensity was 180 W / cm². 2 Under these conditions, the color change (ΔE) before and after 100 hours of irradiation was measured. The color was determined by measuring the L*, a*, and b* values ​​using a spectrophotometer "CM2500d" (manufactured by Konica Minolta), and then calculating it using the following formula (D). ΔE*={(L*AL*B) 2 +(a*Aa*B) 2 +(b*Ab*B) 2} 1 / 2 ...(D) (In formula (D), L*A, a*A, and b*A represent the color tones of the laminate after UV irradiation, while L*B, a*B, and b*B represent the color tones of the laminate before UV irradiation.)

[0143] The raw materials used in this embodiment are as follows: Biomass PC: A plant-derived polycarbonate resin obtained by melt polymerization using isosorbide and 1,4-cyclohexanedimethanol as hydroxy compounds, with a molar ratio of 50:50 between structural units derived from isosorbide and structural units derived from 1,4-cyclohexanedimethanol. Glass transition temperature: 98°C, mass-average molecular weight (Mw): 70000 General-purpose PC: Bisphenol A-based homopolycarbonate (interfacial polymerization method), mass-average molecular weight: approximately 72,000, melt flow rate (300°C, 1.2 kgf): 4 g / 10 min, glass transition temperature: 150°C Filler: Titanium dioxide (rutile type, refractive index 2.7)

[0144] (Manufacturing of resin film 1) The mixture was blended according to the specified proportions, kneaded using an extruder, and extruded from a die at 230°C. The mixture was then rapidly cooled at approximately 95°C using a casting roll to obtain a resin film. The following resin films, PC1 and PC2, were produced. PC1: A polycarbonate resin film made from biomass PC. PC2: A filler-containing film comprising 12 parts by mass of filler per 100 parts by mass of biomass PC. (Manufacturing of resin film 2) The mixture was blended according to the specified proportions, kneaded using an extruder, and then extruded from a die at 270°C. Afterward, it was rapidly cooled on a casting roll at approximately 120°C to obtain a resin film. The following resin films, PC3 and PC4, were produced. PC3: A polycarbonate resin film made from general-purpose PC. PC4: A polycarbonate resin film containing a filler, comprising 12 parts by mass of a filler to 100 parts by mass of general-purpose PC.

[0145] [Example 1] The laminate was obtained by laminating each film in the configuration shown in Table 1 (total thickness 800 μm). The lamination method involved stacking all the resin films shown in Table 1, heat-treating them at 140°C for 5 minutes, pressing them under a pressure of 0.6 MPa for 1 minute, and then cooling them under a pressure of 0.6 MPa.

[0146] [Examples 2-3] The procedure was carried out in the same manner as in Example 1, except that the film thickness, number of sheets, and type were changed as shown in Table 1.

[0147] [Comparative Examples 1-3] A laminate was obtained by laminating each film in the configuration shown in Table 2 (total thickness of 800 μm). The lamination method involved stacking all the resin films shown in Table 2, heat-treating them at 170°C for 5 minutes, pressing them under a pressure of 0.6 MPa for 1 minute, and then cooling them under a pressure of 0.6 MPa.

[0148] [Reference examples 1~2] A single film frame was used.

[0149] [Table 1]

[0150] [Table 2] *In Tables 1 and 2, the values ​​in the oversheet and coresheet columns represent the thickness of each resin film, and this laminate is constructed by laminating the resin films in the order shown in Tables 1 and 2.

[0151] As described above, in Examples 1 to 3, it was found that by combining the present film with a resin film containing a specific structural unit (A1), the color change (ΔE) was small and the film had sufficient durability for outdoor use. In contrast, although the films of Comparative Examples 1 to 3 were made of polycarbonate resin, they did not use a resin containing the specific structural unit (A1), resulting in a noticeable color change (ΔE) and making them unsuitable for outdoor use. [Explanation of symbols]

[0152] 10, 10A Stackable card or passport 11, 11A~11C, 12, 12A, 12B, 13, 13A, 13B, 15, 20 Resin film 16 IC Sheets (Inlet Sheets) 17 IC chips 21 Clear window (opening) 22, 23, 24 Transparent film (transparent layer) 30 Laminated structure

Claims

1. A laminate comprising a core sheet and oversheets on both sides, Both the core sheet and the resin film constituting the oversheet contain a polycarbonate resin (A) having a structural unit (A1) derived from a dihydroxy compound having a portion represented by the following formula (1) in part of its structure, and do not contain an ultraviolet absorber. In a weathering exposure test using a xenon weather meter, the temperature was 63°C, 50% RH, and the UV irradiation intensity was 180 W / cm². ２ A laminate for cards or passports in which the color change (ΔE) represented by the following formula (D) before and after 100 hours of irradiation with ultraviolet light under the specified conditions is 10.0 or less. 【Chemistry 1】 However, the part represented by formula (1) above is -CH ２ Except when it is part of -O-H. ΔE*={(L*A-L*B) ２ +(a*A-a*B) ２ +(b*A-b*B) ２ } １／２ ・・・(D) (In formula (D), L*A, a*A, and b*A represent the color tones of the laminate after UV irradiation, and L*B, a*B, and b*B represent the color tones of the laminate before UV irradiation.)

2. A laminate for a card or passport according to claim 1, wherein the core sheet and each of the oversheets are heat-fused together.

3. The laminate for a card or passport according to claim 1, wherein the core sheet is composed of two or more layers of resin film.

4. The laminate for a card or passport according to claim 1, wherein the core sheet is composed of three or more layers of resin film.

5. The laminate for a card or passport according to claim 1, wherein each of the oversheets is composed of two or more layers of resin film.

6. The laminate for a card or passport according to claim 1, wherein the resin film constituting the core sheet contains a filler.

7. The laminate for a card or passport according to claim 6, wherein the refractive index of the filler is 2 or more.

8. The laminate for a card or passport according to claim 6, wherein the filler contains titanium oxide.

9. The laminate for a card or passport according to claim 6, wherein the content of the filler in the resin film is 10 to 50% by mass.

10. The laminate for a card or passport according to claim 1, wherein at least one of the resin films further contains an impact-resistant agent, and the content of the impact-resistant agent in the resin film is 1 to 30% by mass.

11. The laminate for a card or passport according to claim 1, wherein the resin film constituting the oversheet contains an impact-resistant improving agent.

12. The laminate for a card or passport according to claim 1, wherein the thickness of the resin film is 10 to 300 μm.

13. A laminate for a card or passport according to claim 1, having an opening.

14. A laminate for a card or passport according to claim 1, comprising an inlet sheet.

15. A card comprising a card or passport laminate as described in any one of claims 1 to 14.

16. A passport comprising a card or passport laminate as described in any one of claims 1 to 14.

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