Film for cards or passports, inlet sheets, cards and passports

Abstract

To enhance concealability of an inlet such as an IC chip, and printability to a laser marking sheet.SOLUTION: A film for a card or a passport contains a resin and a filler, wherein a content of the filler is 29 mass% or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a film for cards or passports, an inlet sheet having the film, a card and a passport. [Background technology]

[0002] In a passport, the data page on which personal information, a photograph, etc. are written is generally made up of multiple overlapping films. For example, writing is done on the data page by laser printing, and security features such as lenticular or hologram printing may be added. Similarly, cards are made up of multiple overlapping films, and writing is done by laser printing, and security features such as special printing may be added.

[0003] Passport data pages and cards are broadly divided into a transparent layer and a colored layer made of white or other materials, and security features and laser marking are generally applied to the transparent layer. The colored layer, also known as the core sheet, contains inlets such as IC chips. Therefore, the core sheet must be able to properly hold inlets such as IC chips and conceal them.

[0004] It is known that the core sheet is formed from a thermoplastic resin composition containing a thermoplastic resin such as a polyester resin, a polycarbonate resin, or a mixture thereof. It is also known that the thermoplastic resin composition is blended with additives such as titanium oxide, inorganic fillers such as talc, mica, and calcium carbonate, and rubber-like elastomers (see, for example, Patent Document 1). The blending of titanium oxide and inorganic fillers imparts the core sheet with concealing properties that enable it to conceal inlets such as IC chips. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-262557 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, high security has been required for passports and cards, and the amount of information written on them has been increasing year by year. While there is a demand for thicker transparent layers, there is also a need to maintain the thickness of the data pages and cards themselves. Therefore, it has been considered to thicken the transparent layers and to thin the colored layers, such as core sheets, by the same amount. However, thinning the colored layers, such as core sheets, may result in insufficient concealment of the inlet.

[0007] Furthermore, printing of personal information and the like is often performed on laser marking sheets formed from a transparent layer and containing a laser coloring agent, but laser printability is sometimes insufficient, and there is a demand for improved laser printability.

[0008] Therefore, an object of the present invention is to provide a film for cards or passports that can improve the concealment of inlets such as IC chips and the printability on laser marking sheets. [Means for solving the problem]

[0009] As a result of extensive research, the present inventors have discovered that by incorporating a certain amount or more of a filler such as titanium oxide into a film for forming a core sheet or the like, the concealment of the inlet is improved and, surprisingly, the laser marking performance of the laser marking sheet when laminated thereon is improved, and have completed the present invention as described below. That is, the present invention provides the following [1] to

[12] .

[0010] [1] A card or passport film containing a resin and a filler, wherein the content of the filler is 29% by mass or more. [2] The card or passport film according to [1] above, further comprising an impact modifier, the content of which is 1% by mass or more and 30% by mass or less. [3] The card or passport film according to [1] or [2] above, further comprising at least one additive (X) selected from the group consisting of antioxidants and heat stabilizers, wherein the content of the additive (X) is 0.01% by mass or more and 3% by mass or less. [4] The film for cards or passports according to any one of the above [1] to [3], wherein the refractive index of the filler is 2 or more. [5] The card or passport film according to any one of the above [1] to [4], wherein the filler contains titanium oxide. [6] The film for cards or passports according to any one of the above [1] to [5], wherein the resin is at least one selected from the group consisting of polycarbonate resins and polyester resins. [7] A middle layer containing the resin and the filler, and two surface layers provided on both sides of the middle layer, The film for cards or passports according to any one of the above [1] to [6], wherein each of the surface layers contains the resin, the filler, and an impact resistance improver. [8] The card or passport film according to any one of [1] to [7] above, which is used as a core sheet. [9] An inlet sheet comprising the card or passport film described in any one of [1] to [8] above.

[10] The inlet sheet according to [9] above, having a thickness of 100 μm or more and 500 μm or less.

[11] A card comprising any one of the above items [1] to [8] and a card or passport film, or the inlet sheet described in the above item [9] or

[10] .

[12] A passport comprising any one of the above items [1] to [8] and a card or passport film, or an inlet sheet according to the above item [9] or

[10] . [Effects of the Invention]

[0011] According to the present invention, a film for cards or passports is provided that can improve the concealment of inlets such as IC chips and the printability on laser marking sheets. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an example of an IC sheet. DETAILED DESCRIPTION OF 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. In addition, the terms "film" and "sheet" used in the following description are not clearly distinguished from each other, and the term "film" includes the term "sheet," and the term "sheet" includes the term "film."

[0014] <Card or passport film> The card or passport film of the present invention (hereinafter sometimes simply referred to as "the film") contains a resin and a filler.

[0015] [resin] The resin usable in the present invention is preferably a thermoplastic resin, which makes it possible to easily obtain a core sheet for forming a card or passport by hot pressing multiple resin films including the present film together. Specific examples of resins that can be used include polycarbonate resins, polyester resins, polyolefin resins, acrylic resins, polystyrene resins, polyamide resins, polyvinyl chloride resins, polyvinylidene chloride resins, polyvinyl alcohol resins, ethylene-vinyl alcohol resins, polycycloolefin resins, ethylene-vinyl acetate copolymer resins, ethylene (meth)acrylate copolymer resins, polyphenylene ether resins, polyacetal resins, acrylonitrile-butadiene-styrene copolymer resins, polyaryletherketone resins, polyimide resins, polyphenylene sulfide resins, polyarylate resins, polysulfone resins, polyethersulfone resins, and fluororesins. These resins may be used alone or in combination of two or more. Among these, from the viewpoints of durability and processability, it is preferable to use either a polycarbonate resin or a polyester resin, and among these, it is more preferable to use a polycarbonate resin from the viewpoints of excellent impact resistance, heat resistance, etc., and good bending resistance.

[0016] (Polycarbonate resin) The polycarbonate resin used in the present film is not particularly limited, but examples thereof include bisphenol-based polycarbonate and polycarbonate resins containing a structural unit derived from a dihydroxy compound having a moiety represented by the formula (1) described below as part of the structure. The polycarbonate resins may be used alone or in combination of two or more. Among the above-mentioned polycarbonate resins, bisphenol-based polycarbonate is preferred. Use of bisphenol-based polycarbonate makes it easier to achieve excellent impact resistance, heat resistance, and bending resistance.

[0017] The bisphenol-based polycarbonate refers to a polycarbonate in which 50 mol% or more, preferably 70 mol% or more, and more preferably 90 mol% or more of the structural units derived from dihydroxy compounds are structural units derived from bisphenol. The bisphenol-based polycarbonate may be either a homopolymer or a copolymer. The bisphenol-based polycarbonate may have a branched structure or a linear structure, or may be a mixture of a resin having a branched structure and a resin having only a linear structure.

[0018] Specific examples of bisphenols include 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), 1,1-bis(4-hydroxyphenyl)-1-phenylethane (bisphenol AP), 2,2-bis(4-hydroxyphenyl)hexafluoropropane (bisphenol AF), 2,2-bis(4-hydroxyphenyl)butane (bisphenol B), bis(4-hydroxyphenyl)diphenylmethane (bisphenol BP), 2,2-bis(3-methyl-4-hydroxyphenyl)propane (bisphenol C), 1,1-bis(4-hydroxyphenyl)ethane (bisphenol E), bis(4-hydroxyphenyl)methane (bisphenol F), 2,2-bis( Examples of bisphenols include 4-hydroxy-3-isopropylphenyl)propane (bisphenol G), 1,3-bis(2-(4-hydroxyphenyl)-2-propyl)benzene (bisphenol M), bis(4-hydroxyphenyl)sulfone (bisphenol S), 1,4-bis(2-(4-hydroxyphenyl)-2-propyl)benzene (bisphenol P), 5,5'-(1-methylethylidene)-bis[1,1'-(bisphenyl)-2-ol]propane (bisphenol PH), 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (bisphenol TMC), and 1,1-bis(4-hydroxyphenyl)cyclohexane (bisphenol Z). Bisphenols may be used alone or in combination of two or more.

[0019] As the bisphenol, 2,2-bis(4-hydroxyphenyl)propane, ie, bisphenol A, is preferably used, but part of the bisphenol A may be replaced with another bisphenol. Of the structural units derived from dihydroxy compounds, the structural units derived from bisphenol A are preferably 50 mol % or more, more preferably 70 mol % or more, even more preferably 90 mol % or more, and most preferably 100 mol %. Therefore, bisphenol A homopolycarbonate is the most preferred polycarbonate resin.

[0020] The bisphenol polycarbonate may be produced by any known method such as the phosgene method (also called the interfacial polymerization method), the ester exchange method, or the pyridine method. For example, the transesterification method is a production method in which bisphenol and a carbonic acid diester are subjected to melt transesterification polycondensation in the presence of a basic catalyst and an acidic substance that neutralizes the basic catalyst. Specific examples of the carbonate diester include diphenyl carbonate, ditolyl carbonate, bis(chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis(biphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl carbonate, and dicyclohexyl carbonate, with diphenyl carbonate being particularly preferred.

[0021] As described above, the polycarbonate resin may contain a structural unit (hereinafter sometimes referred to as structural unit (A1)) derived from a dihydroxy compound having a moiety represented by the following formula (1) as part of its structure. Polycarbonate resins containing the structural unit (A1) can be produced from plant-derived raw materials, thereby reducing the environmental impact.

[0022] [ka] However, this does not include the case where the moiety represented by formula (1) is a part of —CH—OH. In other words, the dihydroxy compound refers to a compound that contains at least two hydroxyl groups and a moiety represented by formula (1).

[0023] The dihydroxy compound having a moiety represented by formula (1) as a part of its structure is not particularly limited as long as it has a structure represented by formula (1) in the molecule, but specific examples thereof 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-cyclohexylphenyl)fluorene,

[0039] Examples of the fluorene include compounds having an aromatic group on a side chain and an ether group bonded to the aromatic group on the main chain, such as 9,9-bis(4-(2-hydroxyethoxy)-3-phenylphenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)fluorene, 9,9-bis(4-(2-hydroxyethoxy)-3-tert-butyl-6-methylphenyl)fluorene, and 9,9-bis(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).

[0024] Among the above, dihydroxy compounds having a cyclic ether structure are preferred, and anhydrous sugar alcohols such as those represented by formula (2) are particularly preferred. More specifically, dihydroxy compounds represented by formula (2) include isosorbide, isomannide, and isoidet, which are stereoisomers. Furthermore, 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 may be used alone or in combination of two or more.

[0025] [ka] [ka] In formula (3), R1 to R4 are each independently an alkyl group having 1 to 3 carbon atoms.

[0026] The dihydroxy compound represented by the formula (2) is an ether diol that can be produced from carbohydrates using plant-derived substances as raw materials. In particular, isosorbide can be produced inexpensively by hydrogenating and then dehydrating D-glucose obtained from starch, and is abundantly available as a resource. For these reasons, isosorbide is most preferably used.

[0027] The polycarbonate resin containing the structural unit (A1) may further contain a structural unit other than the structural unit (A1) as a structural unit derived from a dihydroxy compound, and preferably contains, for example, a structural unit derived from at least one dihydroxy compound selected from an aliphatic dihydroxy compound and an alicyclic dihydroxy compound (hereinafter, sometimes referred to as the structural unit (A2)).

[0028] The aliphatic dihydroxy compound used in the polycarbonate resin containing the structural unit (A1) is not particularly limited in terms of the number of carbon atoms, but preferably includes an aliphatic dihydroxy compound having about 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms. Specific 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, etc. 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. Furthermore, as the structural unit derived from an aliphatic dihydroxy compound, for example, those described in International Publication No. 2004 / 111106 can also be used.

[0029] The structural unit derived from an alicyclic dihydroxy compound used in the polycarbonate resin containing the structural unit (A1) preferably contains at least one of a five-membered ring structure and a six-membered ring structure, and in particular, the six-membered ring structure may be fixed in a chair or boat shape by a covalent bond. By containing structural units derived from an alicyclic dihydroxy compound of these structures, the heat resistance of the resulting polycarbonate resin can be improved. The alicyclic dihydroxy compound contains, for example, 5 to 70 carbon atoms, preferably 6 to 50 carbon atoms, and more preferably 8 to 30 carbon atoms. The alicyclic dihydroxy compound is preferably at least one selected from cyclohexanedimethanol, tricyclodecane dimethanol, adamantanediol, and pentacyclopentadecanedimethanol, and from the viewpoints of economy and heat resistance, cyclohexanedimethanol or tricyclodecane dimethanol is more preferred, and cyclohexanedimethanol is even more preferred. As for cyclohexanedimethanol, 1,4-cyclohexanedimethanol is particularly preferred from the viewpoint of industrial availability. Furthermore, as the structural unit derived from an alicyclic dihydroxy compound, those described in WO 2007 / 148604 can also be used.

[0030] The content of the structural unit (A1) in the polycarbonate resin containing the 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, based on the structural units derived from the dihydroxy compound. By adjusting the content within this range, coloration due to the carbonate structure and coloration due to trace amounts of impurities contained in plant-derived materials can be effectively suppressed. Furthermore, this tends to achieve a balance of physical properties such as moldability, mechanical strength, and heat resistance, which is difficult to achieve with polycarbonate resins composed only of the structural unit (A1). On the other hand, the content of the structural unit (A2) in the polycarbonate resin containing the structural unit (A1) is preferably 25 mol% or more, more preferably 30 mol% or more, and even more preferably 35 mol% or more, of the structural units derived from the dihydroxy compound, and is preferably 70 mol% or less, more preferably 60 mol% or less, and even more preferably 55 mol% or less.

[0031] In the polycarbonate resin containing the structural unit (A1), the structural unit derived from a dihydroxy compound preferably consists of the structural unit (A1) and the structural unit (A2), but structural units derived from other dihydroxy compounds may also be included. Specifically, a small amount of an aromatic ring-containing dihydroxy compound, such as bisphenols such as 2,2-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A), may be copolymerized. The use of an aromatic ring-containing dihydroxy compound is expected to efficiently improve heat resistance and moldability, but adding too much tends to cause problems with weather resistance. Therefore, it is best to use 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.

[0032] Polycarbonate resins containing the structural unit (A1) described above can be produced by commonly used polymerization methods, including either the phosgene method or the transesterification method of reacting with a carbonate diester. Among these, the transesterification method, in which a dihydroxy compound having a moiety represented by formula (1) as part of its structure and another dihydroxy compound are reacted with a carbonate diester in the presence of a polymerization catalyst, is preferred. The transesterification method is a polymerization method in which a dihydroxy compound, a carbonate diester, a basic catalyst, and an acidic substance that neutralizes the catalyst are mixed together to carry out a transesterification reaction. Specific examples of the carbonate diester are as described above, and diphenyl carbonate is particularly preferred.

[0033] The mass average molecular weight of the polycarbonate resin is usually 10,000 or more, preferably 30,000 or more, more preferably 38,000 or more, and even more preferably 40,000 or more, in view of the balance between mechanical properties and moldability, and is usually 100,000 or less, preferably 80,000 or less. The mass average molecular weight can be measured by gel permeation chromatography (GPC) using polystyrene as a standard substance. Furthermore, as will be described later, the polycarbonate resin preferably has a low molecular weight from the viewpoint of being able to suppress foaming without blending the 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, from the viewpoint of heat resistance such as impact resistance, dynamic bending durability, and deflection temperature under load, it is also preferable that the polycarbonate resin has a high molecular weight, and from such a viewpoint, the mass average molecular weight of the polycarbonate resin is preferably 37,000 or more, more preferably 40,000 or more, even more preferably 45,000 or more, still more preferably 50,000 or more, even more preferably 55,000 or more, still more preferably 58,000 or more, even more preferably 60,000 or more, and particularly preferably 63,000 or more.

[0034] Furthermore, in view of the balance between mechanical properties and moldability, the viscosity average molecular weight of the polycarbonate resin is usually 12,000 or more, preferably 15,000 or more, more preferably 20,000 or more, even more preferably 22,000 or more, still more preferably 26,000 or more, and particularly preferably 29,000 or more, and is usually 50,000 or less, preferably 45,000 or less, more preferably 40,000 or less, and even more preferably 35,000 or less. Also from the viewpoint of being able to suppress foaming without blending additive (X), the viscosity average molecular weight is preferably 33,000 or less. The viscosity average molecular weight was measured using dichloromethane as a solvent, and the intrinsic viscosity ([η]) (unit: dl / g) at a temperature of 20°C was determined using an Ubbelohde viscometer, and the viscosity average molecular weight was calculated using the Schnell viscosity formula: η = 1.23 × 10 -4 M 0.83 It can be calculated from the formula:

[0035] From the viewpoints of mechanical properties and moldability, the melt flow rate (300°C, 1.2 kgf) of the polycarbonate resin 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, still more preferably 6 g / 10 min or more, and preferably 50 g / 10 min or less, more preferably 40 g / 10 min or less, even more preferably 30 g / 10 min or less, still more preferably 25 g / 10 min or less, and even more preferably 20 g / 10 min or less. The melt flow rate of the polycarbonate resin can be measured in accordance with ISO 1133.

[0036] The glass transition temperature of the polycarbonate resin is preferably 110°C or higher, more preferably 125°C or higher, even more preferably 135°C or higher, and even more preferably 140°C or higher, and is preferably 200°C or lower, more preferably 175°C or lower, more preferably 170°C or lower, and even more preferably 165°C or lower. By setting the glass transition temperature to the above lower limit or higher, it becomes easier to impart appropriate heat resistance and to reduce dimensional changes during the production of cards or passports. On the other hand, by setting the glass transition temperature to the above upper limit or lower, good moldability and the like are also achieved. The glass transition temperature can be obtained by measuring the temperature dispersion of dynamic viscoelasticity using a viscoelasticity spectrometer in accordance with JIS K7244-4:1999 at a strain of 0.07%, a frequency of 1 Hz, a heating rate of 3°C / min, and in a tensile mode, and determining the temperature at the peak top of the loss modulus.

[0037] (polyester resin) Examples of polyester resins include polyesters obtained by polycondensation of dicarboxylic acids and dihydroxy compounds. Dicarboxylic acid derivatives such as dicarboxylic acid esters and acid halides may also be used to synthesize polyester resins. The use of polyester resins as resins improves low-temperature fusion properties, making it easier to bond the film to other films by heat fusion at relatively low temperatures. Furthermore, processability and the like are also likely to be improved.

[0038] From the viewpoint of heat resistance, it is preferable to use an aromatic dicarboxylic acid as the dicarboxylic acid used to obtain the polyester resin, and therefore it is preferable that the polyester resin contains structural units derived from an aromatic dicarboxylic acid. The aromatic dicarboxylic acid is not particularly limited, and examples thereof 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, anthracene dicarboxylic acid, 4,4'-diphenyl dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 5-sulfoisophthalic acid, sodium 3-sulfoisophthalate, 2-chloroterephthalic acid, 2,5-dichloroterephthalic acid, and 2-methylterephthalic acid. Of these, terephthalic acid and isophthalic acid are preferred, and terephthalic acid is more preferred. The aromatic dicarboxylic acids may be used alone or in combination of two or more.

[0039] The aromatic dicarboxylic acid-derived structural units are preferably contained in the polyester resin in an amount 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 of the dicarboxylic acid-derived structural units. The upper limit is not particularly limited as long as it is 100 mol % or less, and is most preferably 100 mol %.

[0040] In addition to structural units derived from aromatic dicarboxylic acids, the polyester resin may also contain a small amount (usually 40 mol% or less, for example 30 mol% or less, preferably 20 mol% or less) of structural units derived from aliphatic dicarboxylic acids. The aliphatic dicarboxylic acids are not particularly limited, and examples thereof include oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sebacic acid, azelaic acid, dodecanedioic acid, dimer acid, 1,3- or 1,4-cyclohexanedicarboxylic acid, cyclopentanedicarboxylic acid, and 4,4'-dicyclohexyldicarboxylic acid. The aliphatic dicarboxylic acids may be used alone or in combination of two or more.

[0041] The polyester resin preferably contains a structural unit derived from a chain dihydroxy compound, which tends to improve the low-temperature fusion properties of the present film. The chain dihydroxy compound used in the polyester resin may be linear or branched. Specific examples of the chain dihydroxy compound include chain dihydroxy compounds having about 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, and polyglycols, such as polytetramethylene ether glycol, polypropylene glycol, and polyethylene glycol. Among these, a chain dihydroxy compound having 2 to 12 carbon atoms is preferred, and one or more selected from ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol is more preferred, with ethylene glycol (EG) being particularly preferred. The chain dihydroxy compound may be used alone or in combination of two or more kinds.

[0042] The polyester resin is preferably a copolymer polyester resin using two or more dihydroxy compounds as copolymerization components. Specifically, it is preferable to use an alicyclic dihydroxy compound in addition to a chain dihydroxy compound as the dihydroxy compound used to obtain the polyester resin. Therefore, it is preferable that the polyester resin has a structural unit derived from the alicyclic dihydroxy compound in addition to a structural unit derived from the chain dihydroxy compound. The use of an alicyclic dihydroxy compound tends to improve heat resistance, solvent resistance, etc. Specific examples of alicyclic dihydroxy compounds include tetramethylcyclobutanediol, cyclohexanedimethanol (CHDM), tricyclodecane dimethanol, adamantanediol, and pentacyclopentadecanedimethanol. Among these, tetramethylcyclobutanediol and cyclohexanedimethanol are preferred. Examples of cyclohexanedimethanol include 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, and 1,4-cyclohexanedimethanol, with 1,4-cyclohexanedimethanol being preferred due to its industrial availability. Furthermore, 2,2,4,4-tetramethyl-1,3-cyclobutanediol is generally used as tetramethylcyclobutanediol. The alicyclic dihydroxy compound may be used alone or in combination of two or more. As the alicyclic dihydroxy compound, it is preferable to use at least cyclohexanedimethanol, and from the viewpoint of bending resistance, it is preferable to use tetramethylcyclobutanediol and cyclohexanedimethanol in combination.

[0043] In the polyester resin, the proportion of structural units derived from alicyclic dihydroxy compounds, out of the total 100 mol% of structural units derived from chain dihydroxy compounds and 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 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. When the polyester resin contains a certain amount or more of structural units derived from alicyclic dihydroxy compounds, it tends to have good heat resistance. Furthermore, when the structural units derived from alicyclic dihydroxy compounds are kept to a certain amount or less and when the polyester resin contains a certain amount or more of structural units derived from chain dihydroxy compounds, it tends to have good low-temperature fusion properties. In terms of heat resistance and solvent resistance, particularly in high-temperature environments, such as storage modulus and thermal expansion / contraction, the polyester resin preferably contains structural units derived from alicyclic dihydroxy compounds in a total of 100 mol% of structural units derived from chain dihydroxy compounds and structural units derived from alicyclic dihydroxy compounds, of which the proportion is preferably more than 65 mol%, more preferably 70 mol% or more, even more preferably 80 mol% or more, and still more preferably 90 mol% or more. Furthermore, in terms of low-temperature fusion, the proportion of structural units derived from alicyclic dihydroxy compounds in a total of 100 mol% of structural units derived from chain dihydroxy compounds and 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 still more preferably 40 mol% or less.

[0044] As the dihydroxy compound used in the polyester resin, dihydroxy compounds other than chain dihydroxy compounds and alicyclic dihydroxy compounds (also referred to as "other dihydroxy compounds") may be used within the scope that does 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 mol 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.

[0045] Among the above, from the viewpoints of low-temperature fusion property, heat resistance, solvent resistance, etc., the polyester resin preferably contains a structural unit derived from ethylene glycol and a structural unit derived from cyclohexanedimethanol, and also preferably contains a structural unit derived from ethylene glycol, a structural unit derived from cyclohexanedimethanol, and a structural unit derived from tetramethylcyclobutanediol.

[0046] The polyester resin is preferably an amorphous polyester. The use of an amorphous polyester tends to improve the adhesion of the present film to other components, such as resin films. The amorphous polyester may be any polyester that is substantially amorphous. Substantially amorphous (including low-crystalline) polyesters include polyesters that do not exhibit a clear crystalline melting peak upon heating using a differential scanning calorimeter (DSC), polyesters that are crystalline but have a slow crystallization rate and do not become highly crystalline upon molding using a film extrusion method, and crystalline polyesters that exhibit a low crystalline melting heat (ΔHm) of 10 J / g or less upon heating using a differential scanning calorimeter (DSC). In other words, the terms "amorphous" and "polyester" in the present invention also encompass "crystalline polyesters in an amorphous state."

[0047] As described above, the present film preferably uses a polycarbonate resin as the resin. When using a polycarbonate resin, the polycarbonate resin may be used alone or in combination with a resin other than the polycarbonate resin. As such a resin, a known resin that is generally used may be used, but it is preferable to use, for example, a polyester resin. Details of the polyester resin that is used in combination with the polycarbonate resin are as described above. The resin constituting the present film preferably contains polycarbonate resin as a main component, and the polycarbonate resin accounts for, 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 of the total amount of resin constituting the present film.

[0048] [Film layer structure] The present film may have a single layer structure or a multilayer structure. In the following description, a film with a multilayer structure may be referred to as a laminate film. In the case of a multilayer structure, each layer constituting the laminate film contains a resin, and the details of the resin constituting each layer are as described above. Therefore, the resins constituting each layer are preferably thermoplastic resins, and it is preferable to use either a polycarbonate resin or a polyester resin, and it is more preferable to use a polycarbonate resin. The resins constituting each layer may be used alone or as a mixture of two or more types.

[0049] When a polycarbonate resin is used in each layer, the polycarbonate resin may be used alone or may be mixed with a resin other than the polycarbonate resin. The resin other than the polycarbonate resin may be a known resin that is commonly used, but it is also preferable to use a resin that is easily compatible with the polycarbonate resin, such as 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 the present film preferably contains polycarbonate resin as the main component, and the polycarbonate resin accounts for, 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 of the total amount of resin constituting each layer.

[0050] The layer structure of the laminated film is not particularly limited and may have two or more layers, but it is preferable that the laminated film has a surface layer / middle layer / surface layer structure in which surface layers are provided on both sides of the middle layer. When the laminated film has a surface layer / middle layer / surface layer structure, it may consist of these three layers, but it may also have a three-layer or more structure in which an adhesive layer or the like is provided between the surface layer and the middle layer, or two or more middle layers are provided.

[0051] [Filling material] As described above, the present film contains a filler. By containing the filler, the present film has low light transmittance and can exhibit hiding properties. The filler content of the entire film is 29% by mass or more, based on the total amount of the film. If the filler content is less than 29% by mass, the hiding power may not be sufficiently improved. Therefore, for example, when the film is used as an inlet sheet for an IC sheet or the like, an inlet sheet of appropriate thickness may not be able to sufficiently hide the inlet, such as an IC chip.

[0052] By incorporating a large amount of filler as described above, this film can improve the laser markability of a laser marking sheet when it is laminated onto the film. While the principle behind improving the laser marking ability of a laser marking sheet is unclear, it is believed that this film, which contains a large amount of filler, reflects a large amount of laser light, and that this reflected light can improve the laser marking ability of a laser marking sheet laminated onto the film. Furthermore, when a laser marking sheet is directly laminated onto the film, carbonization by the laser light and color development by the laser color-developing agent are more likely to occur at the interface, further improving laser marking ability.

[0053] From the viewpoint of laser marking ability and hiding power, particularly from the viewpoint of laser marking ability, the content of the filler in the entire film is preferably 31% by mass or more, more preferably 33% by mass or more, even more preferably more than 35% by mass, even more preferably 36% by mass or more, even more preferably 37% by mass or more, even more preferably 39% by mass or more, and particularly preferably 40% by mass or more. From the viewpoint of maintaining good mechanical properties such as bending resistance, the content of the filler in the entire film is preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 48% by mass or less, even more preferably 46% by mass or less, even more preferably 44% by mass or less, and particularly preferably 42% by mass or less.

[0054] The filler may be either inorganic or organic, and examples thereof include inorganic fillers such as titanium oxide, talc, mica, calcium carbonate, barium oxide, zinc oxide, carbon black, silica, lead titanate, potassium titanate, zirconium oxide, zinc sulfide, antimony oxide, and zinc oxide. Among these, at least one filler selected from fillers having a refractive index of 2 or higher is preferred, with a refractive index of 2.2 or higher being more preferred, and a refractive index of 2.4 or higher being even more preferred. Examples of fillers having a refractive index of 2 or higher include titanium oxide, lead titanate, potassium titanate, barium titanate, zirconium 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 having a refractive index of 2 or higher further improves hiding power and laser marking properties. Furthermore, the film can be colored white. From these perspectives, titanium oxide is more preferred as the filler. The titanium oxide is not particularly limited, but examples thereof include rutile type titanium oxide, anatase type titanium oxide, etc. The refractive index of the filler can be measured by the Becke line method.

[0055] The average particle size of the filler is not particularly limited, but is, for example, 0.01 μm to 1 μm, preferably 0.05 μm to 0.8 μm, more preferably 0.08 μm to 0.6 μm, even more preferably 0.1 μm to 0.5 μm, and still more preferably 0.12 μm to 0.4 μm. The average particle size refers to the average primary particle size observed with a scanning electron microscope.

[0056] In the case of a laminate film, the present film may contain a filler in at least one layer, but it is preferable that all layers contain a filler. By containing a filler in all layers, the present film can be easily incorporated with a large amount of filler, which facilitates improving both laser coloring and hiding power. For example, in a laminate film having a surface layer / middle layer / surface layer structure, it is preferable that both surface layers and the middle layer contain a filler. In the laminated film, the types of fillers contained in each layer may be different from each other, but are preferably 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 having a refractive index of 2 or more, and more preferably titanium oxide. The filler content in each layer may be adjusted so that the filler content in the entire film is within the above range, but it is preferable to incorporate the filler evenly in each layer. By incorporating the filler evenly in each layer, it is possible to prevent localized decreases in mechanical strength, such as bendability, and to improve the mechanical strength, such as bending resistance, of the entire film. Therefore, the filler content in each layer (e.g., both surface layers and the middle layer) may be 29% by mass or more based on the mass of each layer. The preferred upper and lower limits of the filler content in each layer are the same as the preferred values ​​for the filler content in the entire film described above.

[0057] [Impact modifier] The present film preferably further contains an impact modifier. Even if the present film contains a large amount of filler such as titanium oxide as described above, the addition of an impact modifier mitigates the effects of external impacts, such as bending and impacts, during actual use, making it easier to maintain good bending resistance. Furthermore, the addition of an impact modifier prevents the softening and fluidity reduction that occurs when heated, which can occur due to the use of a specific resin, such as polycarbonate resin, or the inclusion of a large amount of filler such as titanium oxide, making it easier to maintain good processability. This reduces the likelihood of problems such as difficulty embedding IC chips.

[0058] Examples of impact modifiers include soft styrene resins and elastomers. The elastomers may be core-shell elastomers. The impact modifiers may be used alone or in combination of two or more. Among the above, the core-shell type elastomer is preferred as the impact resistance improver. By using the core-shell type elastomer, impact resistance is further improved and bending resistance is further improved.

[0059] Examples of the flexible styrene resin include a block copolymer containing a styrene polymer block and a conjugated diene polymer block, and a block copolymer containing a styrene polymer block and an acrylonitrile block. The styrene content in the flexible styrene-based 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. When the styrene content is in the above range, the effect of imparting impact resistance is further improved.

[0060] The conjugated diene polymer block used in the flexible styrene resin may be a homopolymer of butadiene, isoprene, 1,3-pentadiene, or the like, a copolymer thereof, or a copolymer containing a monomer copolymerizable with the conjugated diene monomer in the block. Specific examples of flexible styrene 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 commercial products include the Kraton D series manufactured by Kraton Polymers, the AR-100 series manufactured by Aron Kasei, the Dialac series manufactured by UMG ABS, and the Delpet series manufactured by Asahi Kasei Chemicals. In addition, as the soft styrene-based resin, the "Dynaron" series manufactured by JSR Corporation, the "Tuftec" series manufactured by Asahi Kasei Chemicals Corporation, the "Hybler" series manufactured by Kuraray Co., Ltd., and the like can be used as the styrene-based elastomer described below.

[0061] Block copolymers include pure block, random block, tapered block, etc., and there are no particular restrictions on the copolymerization form. Furthermore, the block units may have multiple repeating units. Specifically, in the case of styrene-butadiene block copolymers, multiple block units may be repeated, such as styrene-butadiene copolymer, styrene-butadiene-styrene block copolymer, and styrene-butadiene-styrene-butadiene block copolymer.

[0062] Hydrogenated styrene-butadiene-styrene block copolymers (SEBS) and hydrogenated styrene-isoprene-styrene block copolymers (SEPS) can also be used, in which some or all of the double bonds in the conjugated diene polymer blocks of SBS and SIS are hydrogenated. Specific examples of such products include the "Tuftec H" series manufactured by Asahi Kasei Chemicals Corporation and the "Kraton G" series manufactured by Kraton Polymers.

[0063] A polar functional group can also be added to the flexible styrene-based resin. Specific examples of the polar functional group include an acid anhydride group, a carboxylic acid group, a carboxylic acid ester group, a carboxylic acid chloride group, a carboxylic acid amide group, a carboxylic acid salt group, a sulfonic acid group, a sulfonic acid ester group, a sulfonic acid chloride group, a sulfonic acid amide group, a sulfonic acid salt group, an epoxy group, an amino group, an imide group, and an oxazoline group. Among these, it is preferable to add an acid anhydride group or an epoxy group. As flexible styrene-based resins to which polar functional groups have been added, modified SEBS and SEPS are preferably used. Specific examples include maleic anhydride-modified SEBS, maleic anhydride-modified SEPS, epoxy-modified SEBS, and epoxy-modified SEPS. Specific commercial products include the "Tuftec M" series manufactured by Asahi Kasei Chemicals Corporation, the "Dynalon" series manufactured by JSR Corporation, and the "Epofriend" series manufactured by Daicel Chemical Industries, Ltd.

[0064] The soft styrene-based resin may also be a styrene-based elastomer containing an elastomer component. Specific examples of the above include block copolymers of a styrene component with butadiene, isoprene, 1,3-pentadiene, etc., and modified or hydrogenated products thereof. More specific examples include SBS, SIS, SEBS, and SEPS.

[0065] The elastomer may be other than a styrene-based elastomer, and examples thereof include known elastomers such as 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. The elastomer is preferably a polyester-based elastomer or the above-mentioned styrene-based elastomer.

[0066] The polyester elastomer is a thermoplastic polyester that has rubber properties at room temperature, preferably a thermoplastic elastomer primarily composed of a polyester block copolymer, and is preferably a block copolymer having a high-melting-point, highly crystalline aromatic polyester as the hard segment and an 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 soft segment content is preferably 50 to 90 mol%, particularly 60 to 85 mol%. Of these, polyester ether block copolymers, particularly PTMG-PBT copolymers, are preferred.

[0067] A core-shell elastomer is composed of an innermost layer (i.e., a core) and one or more outer layers (i.e., shells) surrounding it. The core-shell elastomer is preferably a core-shell graft copolymer in which a graft-copolymerizable monomer component is graft-copolymerized onto the core as the shell.

[0068] Core-shell graft copolymers usually have a polymer component called a rubber component as the core. In core-shell graft copolymers, the polymer component constituting the core is preferably graft-copolymerized with a monomer component copolymerizable with this polymer component as the shell. The core-shell graft copolymer may be produced by any of the following methods: bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc. The copolymerization method may be either single-stage grafting or multi-stage grafting. However, commercially available core-shell elastomers can usually be used as they are. Examples of commercially available core-shell elastomers are given below.

[0069] Specific examples of polymer components that form the core include butadiene-based rubbers such as polybutadiene and styrene-butadiene copolymers, isoprene-based rubbers, acrylic rubbers such as polybutyl acrylate, poly(2-ethylhexyl acrylate), and butyl acrylate-2-ethylhexyl acrylate copolymers, silicone-based rubbers such as polyorganosiloxane rubbers, butadiene-acrylic composite rubbers, and silicone-acrylic composite rubbers such as IPN (Interpenetrating Polymer Network) composite rubbers made 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 fluororubbers. These may be used alone or in combination of two or more. Among these, in terms of mechanical properties and surface appearance, at least one selected from butadiene rubber, acrylic rubber, silicone rubber, and silicone-acrylic composite rubber is preferred, and among these, at least one selected from butadiene rubber and silicone-acrylic composite rubber is more preferred.

[0070] Specific examples of the monomer component constituting the shell and capable of graft copolymerization with the core polymer component include aromatic vinyl compounds; vinyl cyanide compounds; (meth)acrylic compounds such as (meth)acrylic ester compounds, (meth)acrylic acid compounds, and epoxy group-containing (meth)acrylic ester compounds such as glycidyl (meth)acrylate; maleimide compounds such as maleimide, N-methylmaleimide, and N-phenylmaleimide; α,β-unsaturated carboxylic acid compounds such as maleic acid, phthalic acid, and itaconic acid, and anhydrides thereof (e.g., maleic anhydride). These monomer components may be used alone or in combination of two or more. Among these, aromatic vinyl compounds, vinyl cyanide compounds, and (meth)acrylic compounds are preferred from the viewpoint of mechanical properties and surface appearance, and aromatic vinyl compounds and (meth)acrylic compounds, especially (meth)acrylic ester compounds, are more preferred. 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, and halogenated styrenes, and among these, styrene and α-methylstyrene are more preferred. Specific examples of the (meth)acrylic acid ester compound 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, which are relatively easily available, are preferred, and methyl (meth)acrylate is more preferred. Note that "(meth)acrylic" collectively refers to "acrylic" and "methacrylic."

[0071] Particularly preferred core-shell elastomers are core-shell graft copolymers, which have a core made of at least one polymer component selected from butadiene rubber, acrylic rubber, silicone rubber, and silicone-acrylic hybrid 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 graft copolymer is preferably 40% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more. The total content of the (meth)acrylic compound (especially, the (meth)acrylic acid ester) component and the aromatic vinyl compound component in the shell of the core-shell 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.

[0072] Preferred examples of core-shell 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.

[0073] Commercially available core-shell type graft copolymers include, for example, "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" manufactured by Dow Chemical Japan Co., Ltd. Examples include Mitsubishi Chemical Corporation's "Metablen C-223A," "Metablen E-901," "Metablen S-2001," "Metablen W-450A," "Metablen SRK-200," and "Metablen E-870A," and Kaneka Corporation's "Kane Ace M-210," "Kane Ace M-511," "Kane Ace M-600," "Kane Ace M-400," "Kane Ace M-580," "Kane Ace M-590," "Kane Ace M-711," "Kane Ace MR-01," and "Kane Ace M-300." These impact modifiers such as core-shell type graft copolymers may be used alone or in combination of two or more.

[0074] The content of the impact modifier in the entire film is preferably 1% by mass or more and 30% by mass or less, based on the total amount of the film. When the content of the impact modifier is 1% by mass or more, the effects of external impact are moderately mitigated, and bending resistance and other properties tend to be improved. In addition, softening and a decrease in fluidity when the film is heated, which are caused by the type of resin used or the incorporation of a large amount of filler, are prevented, making it easier to maintain good processability. On the other hand, by setting the content to 30% by mass or less, effects commensurate with the content can be achieved, and the film can be prevented from deteriorating in various physical properties such as heat resistance, or from becoming too fluid during processing. From these viewpoints, the content of the impact modifier 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, and 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.

[0075] When the present film is a laminate film and contains an impact modifier, it is sufficient that at least one layer contains the impact modifier. All layers of the laminate film may contain the impact modifier, but it is preferred that at least the surface layer constituting the outermost layer of the film contains the impact modifier. Therefore, in a laminate film having a surface layer / middle layer / surface layer structure, it is preferable that both surface layers contain an impact modifier, and therefore both surface layers preferably contain an impact modifier in addition to a resin and a filler. On the other hand, it is preferable that the middle layer contains a resin and a filler, but does not contain an impact modifier, or if it does contain an impact modifier, it contains a lower amount of impact modifier than both surface layers. In this way, by containing a relatively large amount of filler in both surface layers, the bending resistance and impact resistance can be improved, and processability can be improved, making it easier to embed IC chips and the like, without the need to increase the content of impact modifier in the entire film.

[0076] The content of the impact modifier 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, based on the mass of each layer, and is 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 content of impact modifier in the middle layer should be less than the content of impact modifier in each of the surface layers, based on the mass of each layer, and is preferably less than 4 mass%, more preferably less than 2 mass%, even more preferably 1 mass% or less, even more preferably 0.5 mass% or less, and most preferably 0 mass%.

[0077] [Heat stabilizer / antioxidant (additive (X))] The present film preferably contains at least one additive (X) selected from a heat stabilizer and an antioxidant. As described above, the present film contains a large amount of filler, which may cause foaming and lead to poor appearance, but the addition of additive (X) can suppress foaming and improve the appearance of the film. The present film may contain, as additive (X), either a heat stabilizer or an antioxidant, or both of these, but it is preferable to contain at least a heat stabilizer, and it is more preferable to use a heat stabilizer and an antioxidant in combination.

[0078] (heat stabilizer) Examples of heat stabilizers include phosphorus-based compounds. Known phosphorus-based compounds can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; metal acid pyrophosphates such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid 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. Metal salts of the organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds may also be used.

[0079] 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, monooctyldiphenylphosphite, dioctylmonophenylphosphite, monodecyldiphenylphosphite, didecylmonophenylphosphite, Examples of suitable phosphite include various phosphites such as bis(2,6-di-tert-butylphenyl)octyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, 4,4'-butylidene-bis(3-methyl-6-tert-butylphenyl-di-tridecyl phosphite), cyclic neopentanetetraylbis(2,6-di-tert-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.

[0080] The organic phosphite compound may also be a phosphite ester having at least one oxetane group. Such an oxetane group-containing phosphite ester may have one, two, or three oxetane groups. Examples of oxetane group-containing phosphites 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, 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-dioxaphosphorinane-5,3'-oxetane), 3,3-bis[spiro(oxetane-3',5"-(1",3",2"-dioxa-2"-phosphorinane))

[0033] P,P'-[(1-methylethylidene)-di-4,1-phenylene]-P,P,P',P'-tetrakis[(3-ethyl-3-oxetanyl)methyl]phosphite and P,P'-[(1-methylethylidene)-di-4,1-phenylene]-P,P,P',P'-tetrakis[(3-ethyl-3-oxetanyl)methyl]phosphite. Also, the oxetane group-containing phosphites described in U.S. Patent No. 3,209,013 can be used as appropriate. The use of the oxetane group-containing phosphites makes it easier to increase the color intensity after the dye has developed a color.

[0081] 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 Groups Ia, IIa, IIb, IIIa, and IIIb of the periodic table, and among these, magnesium, barium, calcium, zinc, and aluminum are even more preferred, with magnesium, calcium, or zinc being particularly preferred. Furthermore, the organic phosphate compound is preferably an acidic organic phosphate ester or a metal salt thereof. Examples of the acidic organic phosphate ester include dialkyl acid phosphate, monoalkyl acid phosphate, diaryl acid phosphate, and monoalkyl monoaryl acid phosphate. The alkyl group in the acidic organic phosphate ester is, for example, an alkyl group having 1 to 30 carbon atoms, preferably 2 to 25 carbon atoms, and more preferably 6 to 23 carbon atoms. The aryl group may have about 6 to 30 carbon atoms.

[0082] Preferred specific examples of the organic phosphate ester compound include acidic organic phosphates such as distearyl acid phosphate and monostearyl acid phosphate. Metal salts of acidic organic phosphates 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 more preferred.

[0083] The organic phosphonite compounds include tetrakis(2,4-di-iso-propylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,4-di-n-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,3'-biphenylene diphosphonite, and tetrakis(2,4-di-tert-butylphenyl)-3,3'-biphenylene diphosphonite. tetrakis(2,6-di-iso-propylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,6-di-n-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,3'-biphenylene diphosphonite, and tetrakis(2,6-di-tert-butylphenyl)-3,3'-biphenylene diphosphonite.

[0084] Among the above phosphorus-based compounds, at least one selected from organic phosphite compounds and organic phosphoric acid ester compounds is preferred from the viewpoints of improving thermal stability, inhibiting oxidation, and inhibiting foaming. Furthermore, organic phosphite compounds are preferably used in combination with the antioxidants described below, and more preferably in combination with phenolic antioxidants. By using them in combination with phenolic antioxidants, foaming in the film can be effectively inhibited. Furthermore, during extrusion film formation, molecular weight reduction and yellowing of the resin can be effectively inhibited, and the extrusion film formation and long-term stability of the molded product can be achieved at the same time.

[0085] The phosphorus-based compound can also be used as an ester exchange inhibitor that can inhibit the ester exchange reaction between a polyester resin and a polycarbonate resin. Therefore, when the present film contains both a polyester resin and a polycarbonate resin as resins, ester exchange in the present film can also be prevented. Furthermore, when the present film contains a polyester resin or a polycarbonate resin, ester exchange with the polycarbonate resin or polyester resin contained in a layer adjacent to the present film in a laminate including the present film can also be prevented. In the present film, the above-mentioned heat stabilizers may be used alone or in combination of two or more.

[0086] (antioxidant) As the antioxidant, for example, a phenol-based antioxidant, a sulfur-based antioxidant, etc. can be used, and among these, a phenol-based antioxidant is preferred.

[0087] 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), stearyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, etc. Among these, 2,6-di-tert-butyl-4-methylphenol (dibutylhydroxytoluene, BHT) is preferred.

[0088] Examples of sulfur-based antioxidants include thiodipropionic acid, dilauryl thiodipropionate, distearyl thiodipropionate, laurylstearyl 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.

[0089] In the case of a laminate film, the additive (X) may be contained in at least one layer of the laminate film, but from the viewpoint of suppressing foaming, it is preferable to contain it in the layer containing the filler. In the case of the present film, it is preferable to contain the filler in all layers, and it is also preferable to contain the additive (X) in all layers. For example, when the present film has a laminated structure of surface layer / middle layer / surface layer, it is preferable that the additive (X) is contained in both the middle layer and both surface layers.

[0090] In the present film, foaming is likely to occur when a polycarbonate resin with a high molecular weight is used as the resin. Therefore, when a high-molecular-weight polycarbonate resin with a high molecular weight is used as the resin in the present film, it is preferable to contain an additive (X). Specifically, the 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 or more and 120,000 or less. Therefore, in the case of a laminate film, it is preferable to contain the additive (X) in the layer in which the high-molecular-weight polycarbonate resin is used as the resin. Furthermore, when the filler is contained in a large amount, specifically when the filler is contained in an amount greater than 30% by mass, even 31% by mass or more, even 33% by mass or more, even 35% by mass or more, even 36% by mass or more, even 37% by mass or more, even 39% by mass or more, and particularly when the filler is contained in an amount greater than 40% by mass or more, mechanical properties such as impact resistance, dynamic bending durability, and toughness tend to be reduced, so it is preferable to use a high molecular weight polycarbonate resin as described above.

[0091] On the other hand, when a low-molecular-weight polycarbonate resin is used as the polycarbonate resin in the present film, foaming is unlikely to occur, so additive (X) does not need to be contained. Similarly, in the case of a laminate film, additive (X) does not need to be contained in the layer in which a low-molecular-weight polycarbonate resin is used as the polycarbonate resin. Specifically, the low molecular weight polycarbonate resin is a polycarbonate resin having a mass average molecular weight of less than 58,000, preferably a polycarbonate resin having a mass average molecular weight of 56,000 or less, and more preferably a polycarbonate resin having a mass average molecular weight of 20,000 or more and 54,000 or less.

[0092] 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 making the content of additive (X) 0.01% by mass or more, the effect of adding additive (X) can be properly exhibited, for example, foaming can be effectively suppressed. Furthermore, by making the content 3% by mass or less, an effect commensurate with the content can be exhibited. 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, and 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.

[0093] As described above, in the present film, 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.

[0094] When the present film is a laminate film, the types of additive (X) contained in each layer of the laminate film may be different or the same. Furthermore, in the case of a laminate film, the content of the filler in each layer may be adjusted so that the content of the filler in the entire present film is within the above-mentioned range. However, the preferred upper and lower limits of the content of additive (X) in each layer containing additive (X) and the preferred range of the mass ratio (antioxidant / thermal stabilizer) are the same as the preferred upper and lower limits of the content of additive (X) in the entire present film, as well as the preferred range of the mass ratio (antioxidant / thermal stabilizer) described above.

[0095] [Antistatic agent] The present film may contain an antistatic agent. The inclusion of an antistatic agent in the present film tends to improve handleability, such as by suppressing static buildup during transport or when stacked on other films, and by reducing adhesion to press plates during heat pressing and other processes. Furthermore, the film's low surface resistivity reduces static electricity generation when unwinding the film from a film roll, effectively preventing sparks from being generated during unwinding, which could scratch the surface of the film, and effectively preventing the film from meandering or skewing during unwinding, resulting in misalignment, twisting, wrinkles, and other problems. This improves handleability and processability. Additionally, the low surface resistivity reduces the likelihood of floating dust particles being attracted by static electricity and adhering to the surface of the film, which could lead to the inclusion of foreign matter in the resulting laminate film, card, passport, or other products, thereby improving dust resistance. Examples of the antistatic agent include low molecular weight antistatic agents, polymeric antistatic agents, etc. These may be either ion-conductive or electron-conductive.

[0096] 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 alkoxysilane, alkoxytitanium, and alkoxyzirconium, and derivatives thereof; and coated silica. The amphoteric antistatic agent may be a betaine type, but may also be a type other than a betaine type, and may be any antistatic agent composed of a cation and an anion, or may be an ionic liquid. The polymeric antistatic agent may be, for example, a polymer such as a vinyl copolymer having a metal sulfonate, such as a metal alkylsulfonate or a metal alkylbenzenesulfonate, in the molecule, or may be a betaine type. Furthermore, polyamide elastomers, polyester elastomers, etc. may also be used. The antistatic agents can be used alone or in combination of two or more.

[0097] Of the above antistatic agents, those composed of a cation and an anion are preferred, and specific examples include 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. The antistatic agent composed of cations and anions is preferably an ionic liquid. Ionic liquids have high electrical conductivity and are liquid at around room temperature, so they have excellent dispersibility and exhibit higher antistatic performance. They also have excellent heat resistance, making it possible to impart excellent antistatic performance while suppressing deterioration of physical properties due to thermal decomposition of the antistatic agent. Note that an ionic liquid refers to a compound composed only of ions and having a melting point of 100°C or less.

[0098] The anion selected from the above-mentioned sulfonimide anion containing a fluorine atom and sulfonate anion containing a fluorine atom preferably includes an anion selected from a perfluoroalkylsulfonimide anion and a perfluoroalkylsulfonate anion. By including a fluorine atom, particularly a perfluoroalkyl group, in the anion, the migration of the ionic liquid to the surface of the film tends to be improved. Therefore, it is possible to impart high antistatic performance with a lower addition amount.

[0099] As the antistatic agent composed of the above-mentioned anion and cation, 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; R 12 each independently represents a hydrocarbon group containing a fluorine atom.

[0100] In equation (4), R 11 are each independently preferably selected from a linear, branched, or cyclic alkyl group, a linear, branched, or cyclic alkenyl group, and an aryl group, more preferably a linear or branched alkyl group, and even more preferably a linear alkyl group. 11 may each have a substituent, but it is preferable that they do not have a substituent. R 11 The number of carbon atoms constituting the hydrocarbon group is, for example, 1 to 20, preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 6, and even 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. 11 may be the same as or different from each other. Multiple R in one molecule 11 If different, three R11 The number of carbon atoms constituting the hydrocarbon group of R is the same as that of the other R 11 The number of carbon atoms constituting the hydrocarbon group of each of the three R 11 The number of carbon atoms constituting the hydrocarbon group is, for example, 9 or less, preferably 4 to 9, more preferably 5 to 8, and even more preferably 6 to 7. 11 The 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. As described above, the hydrocarbon group is preferably an alkyl group.

[0101] R 12 are preferably each 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 the formula, the hydrocarbon group preferably has 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, even more preferably 1 to 4 carbon atoms, and even more preferably 1 to 3 carbon atoms. More specifically, R 12 are each independently preferably a perfluorohydrocarbon group, more preferably a perfluoroalkyl group, further preferably a perfluoromethyl group or a perfluoroethyl group, and even more preferably a perfluoromethyl group. Multiple R in one molecule 12 may be the same as or different from each other.

[0102] The antistatic agent represented by formula (4) is preferably a compound represented by the following formula (5). JPEG0007739837000004.jpg31141

[0103] In a film having a single layer structure, it is preferable that the single layer contains an antistatic agent. In a laminate film, the antistatic agent needs to be contained in at least one layer of the laminate film, and may be contained in all layers. However, the antistatic agent is preferably contained in the surface layer. Therefore, in a laminate film having a surface layer / middle layer / surface layer structure, it is preferable that both surface layers contain an antistatic agent. By containing an antistatic agent in both surface layers, it becomes easier to achieve the above-mentioned effects, such as effectively suppressing static buildup in the film and improving handleability.

[0104] The content of the antistatic agent in each layer containing the antistatic agent is preferably 0.1% by mass to 3% by mass, more preferably 0.2% by mass to 2.5% by mass, even more preferably 0.3% by mass to 2% by mass, and even more preferably 0.4% by mass to 1.5% by mass, when the antistatic agent is composed of a cation and an anion. When the antistatic agent is other than the above, the content of the antistatic agent in each layer is preferably 0.1% by mass to 5% by mass, more preferably 0.2% by mass to 4% by mass, even more preferably 0.4% by mass to 3% by mass, and even more preferably 0.5% by mass to 2% by mass.

[0105] (Other ingredients) The present film may contain additives other than those mentioned above (other additives) that are commonly used in card or passport films. Examples of other additives include lubricants, process stabilizers, UV absorbers, light stabilizers, matting agents, processing aids, metal deactivators, residual polymerization catalyst deactivators, antibacterial and antifungal agents, antiviral agents, and flame retardants. When the present film is a laminate film, at least one of the multiple layers constituting the laminate film may contain at least one of the other additives mentioned above, or all of the layers may contain at least one of the other additives.

[0106] The thickness of the present film is not particularly limited and may be adjusted appropriately depending on the purpose of use, but is, for example, 5 μm or more, preferably 10 μm or more, more preferably 15 μm or more, even more preferably 20 μm or more, and even more preferably 40 μm or more, and is, for example, 300 μm or less, preferably 250 μm or less, more preferably 200 μm or less, and even more preferably 170 μm or less. By making the thickness of the present film at a certain level or more, it becomes easier to ensure concealment properties. On the other hand, by making the thickness below a certain level, it becomes easier to make cards or passports thinner and to impart layers such as security functions to the transparent layer.

[0107] Furthermore, when the present 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 setting the thickness ratio within the above range, the surface layer and the middle layer each tend to exhibit their appropriate functions. For example, as described above, by incorporating an impact modifier in the surface layer and increasing its content compared to the middle layer, the effect of using the impact modifier can be effectively exhibited while suppressing the content of the impact modifier in the entire film.

[0108] (Light transmission density of this film) The light transmission density of the present film is preferably 0.8 or higher. By setting the light transmission density to 0.8 or higher, the concealing properties of the present film are improved, and the present film can adequately conceal inlets such as IC chips. From the viewpoint of improving the concealing properties of the present film, the light transmission density of the present film is more preferably 0.85 or higher, even more preferably 0.9 or higher, even more preferably 0.95 or higher, even more preferably 0.97 or higher, particularly preferably 1 or higher, and most preferably 1.05 or higher. The upper limit of the light transmission density is not particularly limited, but from the viewpoint of preventing the thickness of the present film from becoming unnecessarily thick, it may be, for example, 3 or lower, or 2.5 or lower. The light transmission density can be measured by the method described in the examples.

[0109] (Method of manufacturing card or passport film) The card or passport film (the present film) can be produced by a known method, but it is preferable to obtain a resin composition for forming the present film and then form the resin composition into a film. The resin composition may be obtained, for example, by mixing raw materials constituting the resin composition, such as a resin, a filler, and optionally blended impact modifiers, additive (X), antistatic agents, and other components. The raw materials may be mixed by melt-kneading while heating in an extruder, plastomill, or the like, but the raw materials constituting the resin composition may also be dry-blended in a tumbler or the like and used as is. The method for forming the resin composition into a film is not particularly limited, and may be press molding or extrusion molding, with extrusion molding being preferred from the standpoints of productivity and cost.

[0110] When the present film is a laminated film, a resin composition 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 onto a resin film formed from one of the resin compositions. Alternatively, a multilayer structure may be formed by co-extrusion. From the viewpoints of productivity, cost, etc., it is preferable to adopt a co-extrusion method. In the laminated film, the resin composition for forming each layer may be obtained by mixing components for forming each layer according to the composition of each layer. For example, in the case of a laminated film having a surface layer / middle layer / surface layer structure, a surface layer resin composition containing at least a resin and a filler for forming the surface layer, and a middle layer resin composition containing at least a resin and a filler for forming the middle layer, can be prepared, and the laminated film can be formed using these resin compositions.

[0111] <Card or passport> This film is used for cards or passports, including IC cards, magnetic cards, driver's licenses, residence cards, qualification certificates, employee ID cards, student ID cards, My Number cards, seal registration certificates, vehicle inspection certificates, tag cards, prepaid cards, cash cards, credit cards, ETC cards, SIM cards, and B-CAS cards. The card or passport (more specifically, the data page of the passport) preferably comprises a core sheet. The data page of the card or passport may also comprise, in addition to the core sheet, at least one of a laser marking sheet, a printing sheet, and a protective sheet. The data page of the passport or card may be produced by stacking the core sheet and one or more sheets selected from the above-mentioned sheets other than the core sheet, pressing them together to heat-seal them, and then performing a punching process or the like. Instead of heat-sealing, the sheets may be bonded together using an appropriate adhesive or the like.

[0112] In the present invention, a card or passport comprises the above-described present film. A card or passport usually comprises multiple resin films, at least one of which may be composed of the present film. However, the present film is preferably used as a core sheet in a card or passport. In particular, the present film is preferably used to form an inlet sheet in which an inlet such as an IC chip or antenna is built in, and more preferably used to form an IC sheet in which an IC chip is built in.

[0113] This film has high concealing properties, so when used as a core sheet, especially an inlet sheet such as an IC sheet, it can adequately conceal inlets such as IC chips and antennas even if the inlet sheet is thin. Furthermore, when the present film contains the impact modifier as described above, it can maintain good processability by preventing the softening and loss of fluidity when heated that can be caused by the incorporation of a large amount of filler, etc. Therefore, when the present film contains the impact modifier, it is less likely to cause problems such as difficulty in embedding IC chips, even when used as an inlet sheet. When using the present film for an inlet sheet such as an IC sheet, it is preferable to use two or more sheets laminated together, more preferably three or more sheets laminated together, and even more preferably four or more sheets laminated together. When laminating, the present sheet may be directly laminated to another present sheet, or other layers such as an adhesive layer may be present as needed. Laminating the present film to form an inlet sheet in this manner has the advantage of making it easier to embed inlets such as IC chips and antennas compared to inlet sheets consisting of a single layer of the present film. Furthermore, since IC chips and the like are available in various thicknesses, constructing an inlet sheet such as that shown in Figure 1 (described below) has the advantage of allowing the thickness of the present film on the inner side to be adjusted depending on the thickness of the IC chip. Additionally, the present film on both surfaces of the inlet sheet is positioned above and below the IC chip, thereby providing the advantage of properly concealing the inlet of the IC chip, etc.

[0114] Furthermore, when two or more sheets of this film are laminated in this way to form an inlet sheet, there is the advantage that when the film is laminated with other resin films, such as laser marking sheets or printing sheets, to form actual products such as cards or passports, the overall thickness of the product can be easily adjusted.

[0115] Figure 1 shows an example of an IC sheet as an inlet sheet to which the present film is applied. As shown in Figure 1, the IC sheet (inlet sheet) 11 is made by laminating multiple resin films 10 so that an inlet such as an IC chip 12 is built in. For example, it is preferable to form the IC sheet by laminating two or more resin films 10 with the inlet sandwiched between them and integrating them by heat sealing or the like. 1, the IC sheet (inlet sheet) 11 is formed from four resin films 10, but the number of resin films 10 may be any number greater than or equal to two. Also, although only the IC chip 12 is shown as the inlet, an inlet other than the IC chip 12, such as an antenna, may also be included. Furthermore, at least one of the multiple resin films 10 may be provided with a hollow portion or a notch by being appropriately cut according to the shape of the inlet (e.g., IC chip 12) so that the inlet can be properly embedded therein, and the multiple resin films may be laminated and integrated after the inlet is placed in the hollow portion or the notch. For example, in the example of Fig. 1, of the four resin films 10, the two innermost resin films 10 may be provided with a hollow portion for placing the IC chip 12 therein.

[0116] In an inlet sheet such as IC sheet 11, at least one of the multiple resin films 10 may be the present film described above. Therefore, for example, some of the multiple resin films 10 (for example, in the configuration of FIG. 1, the resin films provided on both surfaces) may be the present film, or all of them may be the present film described above. As described above, the present film has high concealing properties, and by using it as part or all of an inlet sheet such as IC sheet 11, it is possible to adequately conceal inlets such as IC chips 12.

[0117] 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 thickness of the inlet sheet 100 μm or more, inlets such as IC chips can be appropriately concealed by the inlet sheet. Furthermore, by making the thickness 500 μm or less, it is possible to thicken portions other than the inlet sheet without making the passport data page or card unnecessarily thick, making it easier to impart various functions to the data page or card.

[0118] In a passport or card, the inlet sheet may be used as a core sheet, and a laser marking sheet may be laminated on one or both sides of the core sheet. The laser marking sheet is a sheet on which personal information, etc., is printed by laser printing. The personal information is information that identifies the passport or card owner, such as the person's name, personal ID, card number, etc.

[0119] As described above, the present film allows for good printability on laser marking sheets, so laminating a laser marking sheet on the present film can improve the printability of the laser marking sheet. To further improve the printability of the laser marking sheet, the laser marking sheet is preferably positioned so that it is directly laminated to the present film, but it does not have to be directly laminated to the present film. In other words, the present film and the laser marking sheet may be laminated via another layer. For example, in the IC sheet 11 having the configuration shown in FIG. 1, the resin film 10 on the surface is made of this film, so that the laser marking sheet can be directly laminated on this film.

[0120] The laser marking sheet may consist of a single resin layer, but is preferably a multilayer laminate consisting of multiple resin layers. The laser marking sheet preferably includes a resin layer containing a laser coloring agent, and if it consists of a single resin layer, one of the resin layers may contain the laser coloring agent. In the case of a multilayer structure, the laser marking sheet may have, for example, a structure in which surface layers are provided on both sides of a middle layer, and the middle layer may contain the laser coloring agent. The laser marking sheet typically comprises a transparent layer. The thickness of the laser marking sheet is not particularly limited, but is preferably 15 μm to 400 μm, more preferably 30 μm to 300 μm, even more preferably 40 μm to 250 μm, and even more preferably 60 μm to 200 μm. When the thickness of the laser marking sheet is 15 μm or more, various information can be printed appropriately by laser printing. Furthermore, when the thickness is 400 μm or less, the passport or card can be prevented from becoming thicker than necessary.

[0121] The resin used in each resin layer constituting the laser marking sheet is not particularly limited, and may be a polyester resin, a polycarbonate resin, or a combination of these, but from the viewpoint of laser marking properties, it is preferable to use a polycarbonate resin. Details of the polyester resin and polycarbonate resin are as described above.

[0122] The laser color former used in the laser marking sheet is not particularly limited as long as it has the function of generating heat upon irradiation with a laser beam. It may be a so-called self-coloring color former that generates color upon irradiation with a laser beam, or it may be a colorless color former that does not generate color by itself. The laser color former generates heat, promoting carbonization of the surrounding forming material and improving laser marking properties. Furthermore, when a self-coloring laser color former is used, the color generated by the laser color former and the color generated by the carbonized material due to carbonization of the forming material work synergistically, resulting in a print that is deep in color and has excellent visibility. When the laser color former generates color, the color is not particularly limited, but from the perspective of visibility, it is preferable to use a laser color former that can generate dark colors, including black, navy blue, and brown.

[0123] The laser coloring agent 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 thereof 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. Laser coloring agents other than metal oxides may also be used, including metals such as iron, copper, zinc, tin, gold, silver, cobalt, nickel, bismuth, antimony, and aluminum; their 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 capabilities, and lanthanum hexaboride is preferred because of its excellent laser light absorption efficiency. Dye-based dyes, such as fluoran-based, phenothiazine-based, spiropyran-based, triphenylmethaphthalide-based, and rhodamine lactam-based leuco dyes, and carbon black may also be used. As the laser coloring agent, it is preferable to use a bismuth-based metal oxide such as bismuth oxide or a metal oxide containing bismuth and at least one metal selected from Zn, Ti, Al, Zr, Sr, Nd, and Nb. The laser coloring agent may be used alone or in combination of two or more kinds.

[0124] The printing sheet is a sheet on which fixed information is printed before multiple sheets are stacked and integrated. The fixed information is information other than the personal information described above, and is information that does not change regardless of the card or passport. The fixed information is preferably printed on the printing sheet using known ink such as photo- or thermosetting ink. The printing sheet is a colored sheet and may be made of a single-layer resin film or a laminated film made of multiple resin layers. The printing sheet is a sheet disposed on the outside of the inlet sheet. When a laser marking sheet is provided, the printing sheet may be provided between the inlet sheet and the laser marking sheet.

[0125] The printing sheet used in passports or cards may be made of the above-mentioned present film. Since the printing sheet is made of the present film and has high concealing properties, by placing it on the outside of the inlet sheet, it can conceal the inlet even when the inlet sheet cannot sufficiently conceal it. Furthermore, when a laser marking sheet is provided, the laser marking sheet may be laminated on top of the printing sheet, and in such cases, the laser marking ability of the laser marking sheet can be improved as described above.

[0126] The protective sheet used in a passport or card, also known as an oversheet, generally constitutes the outermost layer of the data page of the card or passport. Therefore, when a laser marking sheet or a printing sheet is laminated, the protective sheet is preferably laminated on the outside of these sheets. When laminated on the outside of a laser marking sheet, the protective sheet suppresses the so-called "blistering" that occurs when the laser-printed portion is irradiated with laser light. The protective sheet may consist of a single resin layer or a multilayer laminate consisting of multiple resin layers. The resin used in each resin layer constituting the protective sheet is not particularly limited, and may be a polyester resin, a polycarbonate resin, or a combination of these. However, from the viewpoints of transparency and heat resistance, it is preferable to use a polycarbonate resin. Details of the polyester resin and the polycarbonate resin are as described above. The protective sheet typically constitutes a transparent layer.

[0127] The layered structure of the data page of a passport or a card is not particularly limited, but may be, for example, any one of the following layered structures (1) to (6). (1) Protective sheet / Laser marking sheet / IC sheet (inlet sheet) / Printing sheet / Protective sheet (2) Protective sheet / Laser marking sheet / IC sheet (inlet sheet) / Laser marking sheet / Protective sheet (3) Protective sheet / laser marking sheet / printing sheet / IC sheet (inlet sheet) / printing sheet / laser marking sheet / protective sheet (4) Protective sheet / laser marking sheet / printing sheet / IC sheet (inlet sheet) / laser marking sheet / protective sheet (5) Protective sheet / Laser marking sheet / IC sheet (inlet sheet) / protective sheet (6) Protective sheet / Laser marking sheet / Printing sheet / IC sheet (inlet sheet) / Protective sheet Of the above, the passport or card preferably has the laminated structure (1). In the laminated structures (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.

[0128] In addition, security features such as lenticular printing, hologram printing, and security threads may be provided on passport data pages and cards using special printing, and these may be provided as appropriate, 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.

[0129] A hinge sheet may also be provided in the passport. The hinge sheet serves to firmly bind the data page together with the passport cover, 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. The hinge sheet may also be positioned, for example, between the inlet sheet and the printing sheet, laser marking sheet, or protective sheet, and may be stacked within the data page so that a portion of the hinge sheet protrudes beyond the inlet sheet. [Example]

[0130] Examples and comparative examples will be shown below, but the present invention is not limited by these examples.

[0131] The evaluation method is as follows. (1) Hiding ability (light transmittance density) The light transmission density of the films obtained in each of the Examples and Comparative Examples was measured using a transmission densitometer "341" from X-Rite Corporation. Note that a higher light transmission density indicates a higher hiding power.

[0132] (2) Laser printability A card made using this film was laser-printed at a reflection density of 64 μm / Step x 50% using a Nidec Copal CLM-20, and the reflection density of the laser-printed area was measured using an X-Rite eXact. Note that a higher reflection density indicates better laser printability. The cards used in the laser marking evaluation were prepared as follows using the films obtained in the Examples and Comparative Examples and the following laser marking sheet. The laser marking sheet is a three-layer sheet with surface layers on both sides of a middle layer. The surface layer is made of 100% polycarbonate resin (PC2) by mass, and the middle layer is made of 99.8% polycarbonate resin (PC2) by mass and 0.2% laser color former. The laser marking sheet has a total thickness of 50 μm, and the thickness ratio of surface layer / middle layer / surface layer is 1 / 4 / 1. The cards were made by stacking a laser marking sheet, the present film (15 sheets used in all examples except Example 3, and 7 sheets used in Example 3), and a laser marking sheet in that order, and then heat pressing the laminate at 175°C using a heat press machine, and punching the resulting laminate into a card shape (54 mm x 85 mm).

[0133] The raw materials used in this example are as follows: PC1: Bisphenol A 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 PC2: Bisphenol A homopolycarbonate (interfacial polymerization method), mass average molecular weight: approximately 53,000, melt flow rate (300°C, 1.2 kgf): 15 g / 10 min, glass transition temperature: 150°C Filler: Titanium oxide (rutile type, refractive index 2.7) Antioxidant / heat stabilizer: A phenolic antioxidant (dibutylhydroxytoluene (BHT)) and a phosphorus-based heat stabilizer (tristearyl phosphite) were used in combination at a mass ratio of 1:1. Heat stabilizer: a mixture of distearyl acid phosphate and monostearyl acid phosphate Impact modifier: Core-shell type elastomer, "Metablen E-870A" manufactured by Mitsubishi Chemical Corporation Laser coloring agent: bismuth-neodymium metal oxide, average particle size 0.8 μm, specific gravity: 8.9 g / cm 3

[0134] [Example 1] The components constituting Layer A were run-blended to the composition shown in Table 1, kneaded using an extruder, and extruded from a two-kind, three-layer multi-manifold die at 255°C as Layer A (surface layer). The components constituting Layer B were run-blended to the composition shown in Table 1, kneaded using an extruder, and extruded from the same die at 255°C as Layer B (middle layer). The extruded laminate, consisting of the layers stacked together, was quenched with a casting roll at approximately 120°C to obtain a film consisting of surface layer / middle layer / surface layer with a thickness ratio of 1 / 4 / 1 and a total thickness of 50 μm.

[0135] [Example 2] The same procedure as in Example 1 was carried out except that the formulations of layers A and B were changed as shown in Table 1 and the extrusion temperature of layers A and B was changed to 235°C.

[0136] [Example 3] The components constituting Layer A were run-blended in the proportions shown in Table 1, kneaded using an extruder, and extruded from the extruder at 290°C to obtain a 100 μm-thick film consisting of a single layer of Layer A.

[0137] [Example 4] The same procedure as in Example 3 was carried out except that the composition of each component constituting Layer A was changed as shown in Table 1, the extrusion temperature was changed to 255°C, and the thickness of the obtained film was changed to 50 μm.

[0138] [Comparative Example 1] The same procedure as in Example 4 was carried out except that the composition of each component constituting Layer A was changed as shown in Table 1.

[0139] Comparative Example 2 The same procedure as in Example 1 was carried out except that the formulations of layers A and B were changed as shown in Table 1 and the extrusion temperature of layers A and B was changed to 275°C.

[0140] [Table 1]

[0141] As described above, in Examples 1 to 4, by incorporating a large amount of filler into the film, the light transmission density of the film was increased, and it was possible to improve the concealment of inlets such as IC chips. In contrast, in the films of Comparative Examples 1 and 2, although the filler was incorporated, the content was not large, so the light transmission density was low and it was not possible to sufficiently improve the concealment of inlets such as IC chips. Furthermore, in Examples 1 to 4, when laser printing was performed on a laser marking sheet laminated to this film, the reflection density value was higher than when printing was performed on a laser marking sheet laminated to the films of Comparative Examples 1 and 2, which did not contain a large amount of filler, due to the large amount of filler contained in this film, and laser printability was improved. In particular, the films of Examples 1 and 4 contained additive (X), and the polycarbonate resin used in the film of Example 2 had a low molecular weight and could be extruded at low temperatures, so foaming was less likely to occur in the sheet and the appearance was better. [Explanation of symbols]

[0142] 10 Resin film 11 IC sheet (inlet sheet) 12 IC chip

Claims

1. A card or passport film containing a resin and a filler, wherein the content of the filler is 29% by mass or more, the refractive index of the filler is 2 or more, and the card or passport film is provided with at least a laser marking sheet.

2. 2. The card or passport film according to claim 1, further comprising at least one additive (X) selected from the group consisting of antioxidants and heat stabilizers, wherein the content of the additive (X) is 0.01% by mass or more and 3% by mass or less.

3. 3. A card or passport film according to claim 1 or 2, wherein the filler comprises titanium oxide.

4. 4. The card or passport film according to claim 1, wherein the resin is at least one selected from the group consisting of polycarbonate resins and polyester resins.

5. a middle layer including the resin and the filler, and two surface layers provided on both sides of the middle layer; 5. The card or passport film according to claim 1, wherein each of the surface layers contains the resin and the filler.

6. The card or passport film according to any one of claims 1 to 5, which is used as a core sheet.

7. An inlet sheet comprising the card or passport film according to any one of claims 1 to 6.

8. The inlet sheet according to claim 7, having a thickness of 100 μm or more and 500 μm or less.

9. A card comprising the card or passport film according to any one of claims 1 to 6, or the inlet sheet according to claim 7 or 8.

10. A passport comprising the card or passport film according to any one of claims 1 to 6, or the inlet sheet according to claim 7 or 8.

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