JP2023029088A - Film for card or passport, inlet sheet, card and passport - Google Patents

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

The present invention relates to a card or passport film, an inlet sheet comprising said film, a card and a passport.

In a passport, a data page on which personal information, a photograph of the face, etc. are written is generally composed of a plurality of laminated films. Data pages are sometimes written by laser printing, or provided with security functions such as special printing such as lenticular or hologram printing. Similarly, a card is also constructed by stacking a plurality of films, and may be provided with a security function such as writing by laser printing or special printing.

Passport data pages and cards are roughly divided into a transparent layer and a colored layer such as a white layer. Security functions and laser printing are generally performed on the transparent layer. On the other hand, the colored layer is a part called a core sheet or the like, and contains an inlet such as an IC chip, for example. Therefore, the core sheet is required to have a function of properly holding the inlet of the IC chip and concealing the inlet of the IC chip.

Core sheets are known to be formed from thermoplastic resin compositions including thermoplastic resins such as polyester resins, polycarbonate resins, or mixtures thereof. Further, it is known that the thermoplastic resin composition is blended with additives such as inorganic fillers such as titanium oxide, talc, mica, and calcium carbonate, and rubber-like elastic bodies (for example, Patent Document 1 reference). By blending titanium oxide and an inorganic filler, the core sheet is imparted with a concealing property capable of concealing an inlet such as an IC chip.

JP 2009-262557 A

In recent years, high security is required for passports and cards, and the amount of written information is increasing year by year. It has been demanded. Therefore, it has been studied to increase the thickness of the transparent layer and decrease the thickness of the colored layer such as the core sheet by the increased thickness. However, when the colored layer such as the core sheet is thinned, the inlet hiding property may be insufficient.

Furthermore, personal information is often printed on a laser marking sheet that is formed of a transparent layer and contains a laser coloring agent. is required.

Accordingly, it is an object of the present invention to provide a film for cards or passports, which can improve the concealability of an inlet such as an IC chip and the printability on a laser marking sheet.

As a result of intensive studies, the present inventors have surprisingly found that by including a certain amount or more of a filler such as titanium oxide in a film for forming a core sheet or the like, it is possible to improve the concealability of the inlet while at the same time , found that the laser marking performance of the laser marking sheet is improved when laminated on the laser marking sheet, and completed the following invention. That is, the present invention provides the following [1] to [12].

[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, which further contains an impact modifier and the content of the impact modifier is 1% by mass or more and 30% by mass or less.
[3] Further contains at least one additive (X) selected from the group consisting of antioxidants and heat stabilizers, and the content of the additive (X) is 0.01% by mass or more and 3% by mass or less The card or passport film according to the above [1] or [2].
[4] The card or passport film according to any one of [1] to [3] above, wherein the filler has a refractive index of 2 or more.
[5] The card or passport film according to any one of [1] to [4] above, wherein the filler contains titanium oxide.
[6] The card or passport film according to any one of [1] to [5] above, 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 both surface layers provided on both sides of the middle layer,
The card or passport film according to any one of [1] to [6] above, wherein each of the surface layers contains the resin, the filler, and the impact modifier.
[8] The card or passport film according to any one of [1] to [7] above, which is used for a core sheet.
[9] An inlet sheet comprising the card or passport film according to any one of [1] to [8] above.
[10] The inlet sheet according to the above [9], which has a thickness of 100 μm or more and 500 μm or less.
[11] A card comprising the card or passport film according to any one of [1] to [8] above, or the inlet sheet according to [9] or [10] above.
[12] A passport comprising the card or passport film according to any one of [1] to [8] above, or the inlet sheet according to [9] or [10] above.

According to the present invention, there is provided a film for cards or passports that can improve the concealability of an inlet such as an IC chip and the printability on a laser marking sheet.

It is a typical sectional view showing an example of an IC sheet.

Hereinafter, the present invention will be described in detail with reference to embodiments. However, the present invention is not limited to the embodiments described below. In addition, the term "film" and the term "sheet" used in the following description are not clearly distinguished. film”.

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

[resin]
Resins that can be used in the present invention are preferably thermoplastic resins. By using a thermoplastic resin, it is possible to obtain a core sheet or the like for easily forming a card or a passport by laminating a plurality of resin films including the present film and heat-pressing them.
Specific examples of resins 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, poly Cycloolefin resin, ethylene vinyl acetate copolymer resin, ethylene (meth)acrylate copolymer resin, polyphenylene ether resin, polyacetal resin, acrylonitrile-butadiene-styrene copolymer resin, polyaryl ether ketone resin, polyimide resin, polyphenylene sulfide resin, poly Examples include arylate resins, polysulfone resins, polyethersulfone resins, and fluorine resins.
These resins may be used individually by 1 type, and may use 2 or more types together. Among these, it is preferable to use either polycarbonate resin or polyester resin from the viewpoint of durability and workability. From this point of view, it is more preferable to use a polycarbonate resin.

(polycarbonate resin)
The polycarbonate resin used in the present film is not particularly limited, but is a bisphenol-based polycarbonate, or a polycarbonate containing a structural unit derived from a dihydroxy compound having a site represented by formula (1) described later in part of the structure. A resin etc. are mentioned. Polycarbonate resin may be used individually by 1 type, and may use 2 or more types together.
Of the above polycarbonate resins, bisphenol-based polycarbonate is preferred. By using a bisphenol-based polycarbonate, it is easy to achieve excellent impact resistance, heat resistance, and the like, as well as good bending resistance.

A bisphenol-based polycarbonate is one in which 50 mol % or more, preferably 70 mol % or more, more preferably 90 mol % or more of the structural units derived from a dihydroxy compound are bisphenol-derived structural units. Bisphenol-based polycarbonates may be either homopolymers or copolymers. Moreover, the bisphenol-based polycarbonate may have a branched structure, may have a linear structure, or may be a mixture of a resin having a branched structure and a resin having only a linear structure.

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 (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′-(bis phenyl)-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) and the like can be mentioned. Bisphenol may be used individually by 1 type, and may use 2 or more types together.

As bisphenol, 2,2-bis(4-hydroxyphenyl)propane, that is, bisphenol A is preferably used, but a part of bisphenol A may be replaced with other bisphenol.
Of the structural units derived from the dihydroxy compound, the structural units derived from bisphenol A preferably account for 50 mol% or more, more preferably 70 mol% or more, still more preferably 90 mol% or more, and most preferably 100 mol%. Therefore, bisphenol A homopolycarbonate is most preferable as the polycarbonate resin.

Any known method such as a phosgene method (also referred to as an interfacial polymerization method), a transesterification method, or a pyridine method may be used as the method for producing the bisphenol-based polycarbonate.
For example, the transesterification method is a production method in which a basic catalyst and an acidic substance that neutralizes the basic catalyst are added to bisphenol and a carbonic acid diester to carry out melt transesterification polycondensation.
Specific examples of the carbonic acid diester include diphenyl carbonate, ditolyl carbonate, bis(chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis(biphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, and the like. For example, diphenyl carbonate is preferably used.

Further, as the polycarbonate resin, as described above, a structural unit derived from a dihydroxy compound having a site represented by the following formula (1) in a part of the structure (hereinafter sometimes referred to as a structural unit (A1)) Polycarbonate resins containing A polycarbonate resin containing the structural unit (A1) can be produced from a plant-derived raw material, and can reduce environmental load.

但し、前記式（１）で表される部位が－ＣＨ_２－Ｏ－Ｈの一部である場合を除く。すなわち、前記ジヒドロキシ化合物は、二つのヒドロキシル基と、さらに前記式（１）の部位を少なくとも含むものをいう。

However, this excludes the case where the moiety represented by formula (1) is a part of —CH ₂ —OH. That is, the dihydroxy compound includes at least two hydroxyl groups and the site of formula (1).

The dihydroxy compound having the site represented by formula (1) in a part of the structure is not particularly limited as long as it has the structure represented by formula (1) in the molecule, but specific 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, 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, 9,9-bis(4-(3-hydroxy-2,2-dimethylpropoxy)phenyl)fluorene, etc., having an aromatic group in the side chain and attached to the aromatic group in the main chain Compounds having an ether group, dihydroxy compounds having a cyclic ether structure represented by dihydroxy compounds represented by the following formula (2) and spiroglycol represented by the following formula (3), and the like can be mentioned.

Among the above, a dihydroxy compound having a cyclic ether structure is preferred, and anhydrosugar alcohol represented by formula (2) is particularly preferred. More specifically, the dihydroxy compound represented by formula (2) includes isosorbide, isomannide, and isoidet, which are in a stereoisomeric relationship. Further, as the dihydroxy compound represented by the following formula (3), 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, 3,9-bis (1,1-dipropyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane and the like.
These may be used alone or in combination of two or more.

式（３）において、Ｒ_１～Ｒ_４はそれぞれ独立に、炭素原子数１～３のアルキル基である。

In formula (3), R ₁ to R ₄ are each independently an alkyl group having 1 to 3 carbon atoms.

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 at low cost by hydrogenating D-glucose obtained from starch and then dehydrating it, and is abundantly available as a resource. Under these circumstances, isosorbide is most preferably used.

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 the dihydroxy compound, for example, selected from aliphatic dihydroxy compounds and alicyclic dihydroxy compounds. It is preferable to contain a structural unit derived from at least one dihydroxy compound (hereinafter sometimes referred to as a structural unit (A2)).

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 is preferably about 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms. family dihydroxy compounds. 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-dodecane diols, hydrogenated dilinoleyl glycol, hydrogenated dioleyl glycol, and the like; Preferably ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 1,12 - at least one selected from dodecanediol, more preferably selected from ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol at least one of the Moreover, as a structural unit derived from an aliphatic dihydroxy compound, for example, those described in International Publication No. 2004/111106 can also be used.

The structural unit derived from the alicyclic dihydroxy compound used in the polycarbonate resin containing the structural unit (A1) preferably contains at least one of a 5-membered ring structure and a 6-membered ring structure, and in particular the 6-membered ring structure is shared. It may be fixed in a chair or boat shape by bonding. By including structural units derived from alicyclic dihydroxy compounds having these structures, the heat resistance of the resulting polycarbonate resin can be enhanced.
The number of carbon atoms contained in the alicyclic dihydroxy compound is, for example, 5-70, preferably 6-50, more preferably 8-30.
The alicyclic dihydroxy compound is preferably at least one selected from cyclohexanedimethanol, tricyclodecanedimethanol, adamantanediol and pentacyclopentadecanedimethanol. Cyclohexanedimethanol or tricyclodecanedimethanol are more preferred, and cyclohexanedimethanol is even more preferred. Cyclohexanedimethanol is particularly preferably 1,4-cyclohexanedimethanol because it is easily available industrially.
Moreover, as a structural unit derived from an alicyclic dihydroxy compound, those described in International Publication No. 2007/148604 can also be used.

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, and even more preferably 45 mol of the structural units derived from the dihydroxy compound. % or more, preferably 75 mol % or less, more preferably 70 mol % or less, still more preferably 65 mol % or less. By setting the content in such a range, it is possible to effectively suppress coloring caused by the carbonate structure, coloring caused by impurities contained in trace amounts due to the use of plant resource substances, and the like. In addition, it tends to be possible to balance physical properties such as suitable molding processability, mechanical strength, and heat resistance, which are difficult to achieve with a polycarbonate resin 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, more preferably 30 mol% or more, among the structural units derived from the dihydroxy compound. It is 35 mol % or more, preferably 70 mol % or less, more preferably 60 mol % or less, and still more preferably 55 mol % or less.

In the polycarbonate resin containing the structural unit (A1), the structural unit derived from the dihydroxy compound preferably consists of the structural unit (A1) and the structural unit (A2), but other structural units derived from the dihydroxy compound are may be included. Specifically, copolymerization of a small amount of an aromatic ring-containing dihydroxy compound represented by bisphenol such as 2,2-bis(4-hydroxyphenyl)propane (common name: bisphenol A) can be mentioned. The use of an aromatic ring-containing dihydroxy compound is expected to efficiently improve heat resistance and moldability, but if it is used in a large amount, it tends to cause problems with weather resistance. Good to use.
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′-dimethyl Diphenyl sulfide, 2,2-bis(4-hydroxy-3-methylphenyl)propane (bisphenol C), 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoro Examples include propane (bisphenol AF) and 1,1-bis(4-hydroxyphenyl)decane.

The polycarbonate resin containing the structural unit (A1) described above can be produced by a commonly used polymerization method, and can be produced by either the phosgene method or the transesterification method of reacting with diester carbonate. Among them, a transesterification method is preferred in which a dihydroxy compound having a site represented by the above formula (1) in a part of its structure and another dihydroxy compound are reacted with diester carbonate in the presence of a polymerization catalyst. The transesterification method is a polymerization method in which a dihydroxy compound, a diester carbonate, a basic catalyst, and an acidic substance that neutralizes the catalyst are mixed to conduct an ester exchange reaction. Specific examples of the carbonic acid diester are as described above, among which diphenyl carbonate is preferably used.

The weight average molecular weight of the polycarbonate resin is usually 10,000 or more, preferably 30,000 or more, more preferably 38,000 or more, still more preferably 40,000 or more, and usually 100,000 or less, preferably 80,000, from the balance of mechanical properties and moldability. The range is as follows. The weight average molecular weight can be measured by gel permeation chromatography (GPC) using polystyrene as a standard substance.
Further, as will be described later, the polycarbonate resin preferably has a low molecular weight from the viewpoint of suppressing foaming without adding the additive (X), and from such a viewpoint, the weight average molecular weight of the polycarbonate resin is 70000 or less. It is preferably 65000 or less, more preferably 60000 or less, even more preferably 56000 or less.
On the other hand, the polycarbonate resin preferably has a high molecular weight from the viewpoint of heat resistance such as impact resistance, dynamic bending durability, and deflection temperature under load. It is preferable to be 40000 or more, more preferably 45000 or more, even more preferably 50000 or more, even more preferably 55000 or more, 58000 or more It is more preferably 60,000 or more, and particularly preferably 63,000 or more.

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, still more preferably 22,000 or more, and even more preferably 26,000 or more, from the balance of mechanical properties and moldability. It is particularly preferably 29,000 or more, and is usually in the range of 50,000 or less, preferably 45,000 or less, more preferably 40,000 or less, and still more preferably 35,000 or less. In addition, the viscosity-average molecular weight is preferably 33,000 or less from the viewpoint of suppressing foaming without adding the additive (X).
The viscosity-average molecular weight was measured using dichloromethane as a solvent, using an Ubbelohde viscometer to determine the intrinsic viscosity ([η]) (unit: dl/g) at a temperature of 20°C. Schnell's viscosity formula: η = It can be calculated from the formula of 1.23×10 ⁻⁴ M ^0.83 .

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, still more preferably 3 g/10 min or more, from the viewpoint of mechanical properties and moldability. is 5 g/10 min or more, still more preferably 6 g/10 min or more, preferably 50 g/10 min or less, more preferably 40 g/10 min or less, still more preferably 30 g/10 min. minutes or less, more preferably 25 g/10 minutes or less, and even more preferably 20 g/10 minutes or less. The melt flow rate of polycarbonate resin can be measured according to ISO 1133.

The glass transition temperature of the polycarbonate resin is preferably 110° C. or higher, more preferably 125° C. or higher, still more preferably 135° C. or higher, still more preferably 140° C. or higher, and preferably 200° C. or lower, more preferably 200° C. or higher. is 175° C. or lower, more preferably 170° C. or lower, and still more preferably 165° C. or lower.
By making the glass transition temperature equal to or higher than the above lower limit, it becomes easier to impart appropriate heat resistance, and it becomes easier to reduce dimensional change when producing a card or passport. In addition, the moldability and the like are also improved by setting the content to be equal to or less than the above upper limit.
The glass transition temperature was measured using a viscoelasticity spectrometer in accordance with JIS K7244-4: 1999, with a strain of 0.07%, a frequency of 1 Hz, a heating rate of 3 ° C./min, and dynamic viscoelasticity in a tensile mode. can be obtained by measuring the temperature dispersion of the loss modulus and obtaining the temperature at the peak top of the loss modulus.

(polyester resin)
Examples of polyester resins include polyesters obtained by polycondensation of dicarboxylic acids and dihydroxy compounds. As the dicarboxylic acid, dicarboxylic acid derivatives such as dicarboxylic acid esters and acid halides may be used for the synthesis of the polyester resin. When a polyester resin is used as the resin, low-temperature fusibility is improved, and the present film can be easily adhered to other films by heat fusing at a relatively low temperature. Moreover, it becomes easy to improve workability.

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. Therefore, the polyester resin preferably contains structural units derived from the aromatic dicarboxylic acid. .
The aromatic dicarboxylic acid is not particularly limited, and includes terephthalic acid, isophthalic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, naphthalene-1,5 -dicarboxylic acid, anthracenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 5-sulfoisophthalic acid, 3-sodium sulfoisophthalate, 2-chloroterephthalic acid, 2,5-dichloro Examples include terephthalic acid and 2-methylterephthalic acid. Among these, terephthalic acid and isophthalic acid are preferred, and terephthalic acid is more preferred.
Aromatic dicarboxylic acids may be used singly or in combination of two or more.

The aromatic dicarboxylic acid-derived structural unit accounts for, for example, 60 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, and still more preferably 90 mol% of the dicarboxylic acid-derived structural unit in the polyester resin. It is more preferable to include the above. Moreover, the upper limit is not particularly limited, and may be 100 mol % or less, but is most preferably 100 mol %.

In addition to the structural unit derived from the aromatic dicarboxylic acid, the polyester resin contains a small amount of the structural unit derived from the aliphatic dicarboxylic acid (usually 40 mol% or less, for example 30 mol% or less, preferably 20 mol% or less. ). Aliphatic dicarboxylic acids are not particularly limited and 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. acid, cyclopentanedicarboxylic acid, 4,4'-dicyclohexyldicarboxylic acid and the like. Aliphatic dicarboxylic acids may be used alone or in combination of two or more.

The polyester resin preferably contains a structural unit derived from a chain dihydroxy compound. Since the polyester resin contains a structural unit derived from a chain dihydroxy compound, the low-temperature fusion bondability of the present film tends to be good.
The chain dihydroxy compound used in the polyester resin may be linear or have a branched structure. Specific examples of chain dihydroxy compounds include ethylene glycol (EG), diethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, and 1,4-butane. Diol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, triethylene Examples include chain dihydroxy compounds having about 2 to 18 carbon atoms such as glycol, 1,2-hexadecanediol and 1,18-octadecanediol, and polyglycols such as polytetramethylene ether glycol, polypropylene glycol and polyethylene glycol. Among these, chain dihydroxy compounds having 2 to 12 carbon atoms are preferred, such as ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol and 1,6-hexane. It is more preferably one or more selected from diols, with ethylene glycol (EG) being particularly preferred.
A chain dihydroxy compound may be used individually by 1 type, and may use 2 or more types together.

The polyester resin is preferably a copolymer polyester resin using two or more dihydroxy compounds as copolymer components. Specifically, as the dihydroxy compound used to obtain the polyester resin, it is preferable to use an alicyclic dihydroxy compound in addition to the chain dihydroxy compound. Therefore, the polyester resin preferably has structural units derived from an alicyclic dihydroxy compound in addition to structural units derived from a chain dihydroxy compound. The use of an alicyclic dihydroxy compound tends to improve heat resistance, solvent resistance, and the like.
Specific examples of alicyclic dihydroxy compounds include tetramethylcyclobutanediol, cyclohexanedimethanol (CHDM), tricyclodecanedimethanol, adamantanediol, and pentacyclopentadecanedimethanol. Among these, tetramethylcyclobutanediol and cyclohexanedimethanol are preferred. Cyclohexanedimethanol includes 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol and 1,4-cyclohexanedimethanol. Cyclohexanedimethanol is preferred. As tetramethylcyclobutanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol is generally used.
An alicyclic dihydroxy compound may be used individually by 1 type, and may use 2 or more types together. 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 together.

In the polyester resin, the ratio of the structural unit derived from the alicyclic dihydroxy compound in the total 100 mol% of the structural unit derived from the chain dihydroxy compound and the structural unit derived from the alicyclic dihydroxy compound 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, further preferably 80 mol% or less . By containing a certain amount or more of a structural unit derived from an alicyclic dihydroxy compound, the polyester resin tends to have good heat resistance. In addition, when the structural unit derived from the alicyclic dihydroxy compound is contained in a certain amount or less and the structural unit derived from the chain dihydroxy compound is contained in a certain amount or more, the low-temperature fusion bondability tends to be improved.
In terms of heat resistance and solvent resistance, such as storage elastic modulus and heat expansion ratio in a high-temperature environment, polyester resins have a structural unit derived from a chain dihydroxy compound and a structure derived from an alicyclic dihydroxy compound. The ratio of the structural unit derived from the alicyclic dihydroxy compound in the total 100 mol% of the units is preferably more than 65 mol%, more preferably 70 mol% or more, still more preferably 80 mol% or more, and even more preferably 90 mol%. mol% or more. In addition, in the total 100 mol% of the structural units derived from the chain dihydroxy compound and the structural units derived from the alicyclic dihydroxy compound, the ratio of the structural units derived from the alicyclic dihydroxy compound is is preferably 65 mol % or less, more preferably 55 mol % or less, still more preferably 45 mol % or less, and even more preferably 40 mol % or less.

As the dihydroxy compound used in the polyester resin, a dihydroxy compound other than the chain dihydroxy compound and the alicyclic dihydroxy compound (also referred to as "another dihydroxy compound") may be used as long as the effects of the present invention are not impaired. good. 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% in 100 mol of structural units derived from the dihydroxy compound in the polyester resin. Below, it is most preferably 0 mol %.
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-methyl phenyl)propane (bisphenol C), 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane (bisphenol AF) and 1,1-bis(4-hydroxyphenyl ) and decane.

Among the above polyester resins, from the viewpoint of low-temperature fusion, heat resistance, solvent resistance, etc., it is preferable to include structural units derived from ethylene glycol and structural units derived from cyclohexanedimethanol. It is also preferable to include a structural unit derived from cyclohexanedimethanol, and a structural unit derived from tetramethylcyclobutanediol.

The polyester resin is preferably amorphous polyester. The use of amorphous polyester tends to improve the adhesiveness of the present film to other members such as resin films. The amorphous polyester may be polyester that is substantially amorphous. Polyesters that are substantially non-crystalline (including those with low crystallinity) include polyesters that do not show a clear crystalline melting peak when heated by a differential scanning calorimeter (DSC), and polyesters that have crystallinity. The crystallization rate of polyester is slow and does not reach a state of high crystallinity when formed by extrusion film forming method, etc., and the crystal melting heat value (ΔHm ) can be used as low as 10 J/g or less. That is, the amorphous and polyester in the present invention include "crystalline polyester in an amorphous state".

As described above, it is preferable to use a polycarbonate resin as the resin for the present film. When a polycarbonate resin is used, the polycarbonate resin may be used alone, or a resin other than the polycarbonate resin may be used in combination. As such a resin, it is preferable to use a commonly used known resin, and for example, it is preferable to use a polyester resin. The details of the polyester resin used in combination with the polycarbonate resin are as described above.
The resin constituting the present film preferably contains a polycarbonate resin as a main component, and the polycarbonate resin is, for example, 50% by mass or more, preferably 70% by mass or more, more preferably 70% by mass or more, relative to the total amount of the resin constituting the present film. is 90% by mass or more, most preferably 100% by mass.

[Layer structure of film]
The film may have a single-layer structure or a multi-layer structure. In the following description, a multilayer film may be referred to as a laminated film. In the case of a multilayer structure, each layer constituting the laminated 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, preferably polycarbonate resins or polyester resins, and more preferably polycarbonate resins. The resin constituting each layer may be used singly or as a mixture of two or more.

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. As the resin other than the polycarbonate resin, it is preferable to use a commonly used known resin, and it is preferable to use a resin that is easily compatible with the polycarbonate resin. For example, it is preferable to use a polyester resin. The 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 a polycarbonate resin as a main component. It is preferably 90% by mass or more, most preferably 100% by mass.

The layer structure of the laminated film is not particularly limited as long as it has two or more layers, but it preferably has a surface layer/middle layer/surface layer structure in which surface layers are provided on both sides of the middle layer. When it has a structure of surface layer/middle layer/surface layer, it may consist of these three layers. It may have a structure of layers or more.

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

By containing a large amount of the filler in the present film as described above, when a laser marking sheet is laminated on the present film, the laser marking property of the laser marking sheet can be enhanced. Although the principle of enhancing the laser marking properties of the laser marking sheet is not clear, the film, which contains a large amount of filler, reflects a large amount of laser light, and the reflected light causes the laser marking sheet laminated on the film to detect laser light. It is considered that printability can be improved. Further, when the laser marking sheet is directly laminated on the present film, carbonization by the laser light and color development by the laser coloring agent are likely to occur at the interface, and it is believed that the laser printability can be further improved.

From the viewpoint of laser printability and concealability, particularly from the viewpoint of laser printability, the content of the filler in the entire film is preferably 31% by mass or more, more preferably 33% by mass or more, and still more preferably more than 35% by mass. , more preferably 36% by mass or more, still more preferably 37% by mass or more, even more preferably 39% by mass or more, and particularly preferably 40% by mass or more.
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, from the viewpoint of maintaining good mechanical properties such as bending resistance. % by mass or less is more preferable, 44% by mass or less is even more preferable, and 42% by mass or less is particularly preferable.

The filler may be either an inorganic filler or an organic filler. Examples include titanium oxide, talc, mica, calcium carbonate, barium oxide, zinc oxide, carbon black, silica, lead titanate, potassium titanate, oxide Inorganic fillers such as zircon, zinc sulfide, antimony oxide and zinc oxide are included. Among these, at least one filler selected from fillers having a refractive index of 2 or more is preferable, the refractive index is more preferably 2.2 or more, and further preferably 2.4 or more. Fillers having a refractive index of 2 or more include, for example, 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, barium sulfate and the like. By using a filler having a refractive index of 2 or more, the concealability and laser printability are further improved. The film can also be colored white. From these points of view, titanium oxide is more preferable as the filler. Examples of titanium oxide include, but are not limited to, rutile-type titanium oxide and anatase-type titanium oxide. The refractive index of the filler can be measured by the Becke line method.

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

When the present film is a laminated film, at least one layer may contain a filler, but all layers preferably contain a filler. When all the layers contain a filler, it becomes easier for the present film to contain a large amount of the filler, and it becomes easier to improve both the laser coloring property and the hiding property. For example, in a laminated film having a surface layer/middle layer/surface layer structure, both the surface layers and the middle layer preferably contain a filler.
In the laminated film, the types of filler contained in each layer may be different from each other, but are preferably the same. Therefore, all layers (for example, both surface layers and middle layer) of the laminated film preferably contain at least one filler selected from fillers having a refractive index of 2 or more, including titanium oxide. is more preferable.
The content of the filler in each layer may be adjusted so that the content of the filler in the entire film is within the above range, but the filler is preferably contained equally in each layer. By uniformly including the filler in each layer, it is possible to prevent the mechanical strength such as bendability from being locally lowered, thereby making it easier to improve the mechanical strength such as bend resistance of the entire film.
Therefore, the content of the filler in each layer (for example, both surface layers and middle layer) should be 29% by mass or more based on the mass of each layer. The preferred upper limit and lower limit of the filler content in each layer are the same as the preferred filler content in the entire film.

[Impact modifier]
The film preferably further contains an impact modifier. Even if the film contains a large amount of filler such as titanium oxide as described above, it further contains an impact modifier to mitigate the effects of external impact such as bending and impact during actual use. Therefore, it becomes easier to maintain good bending resistance. In addition, the use of a specific resin such as a polycarbonate resin as a resin and the addition of a large amount of a filler such as titanium oxide can prevent deterioration of softening and fluidity during heating, and can be processed. It becomes easier to maintain good properties. Therefore, problems such as difficulty in embedding an IC chip are less likely to occur.

Examples of impact modifiers include soft styrene resins and elastomers. The elastomer may be a core-shell elastomer. One type of impact modifier may be used alone, or two or more types may be used in combination.
As the impact modifier, core-shell type elastomers are preferable among the above. By using the core-shell type elastomer, the impact resistance is further improved, and the bending resistance is further improved.

Soft styrene resins include block copolymers containing a styrene polymer block and a conjugated diene polymer block, block copolymers containing a styrene polymer block and an acrylonitrile block, and the like.
The styrene content in the soft styrene resin is, for example, 5% by mass or more and 80% by mass or less, preferably 10% by mass or more and 50% by mass or less, more preferably 15% by mass or more and 30% by mass or less. When the styrene content is within the above range, the effect of imparting impact resistance is further improved.

Conjugated diene polymer blocks used for soft styrene resins include homopolymers such as butadiene, isoprene, and 1,3-pentadiene, their copolymers, or monomers copolymerizable with conjugated diene monomers. A copolymer or the like contained therein can be used.
Specific soft styrene resins include styrene/butadiene/styrene block copolymer (SBS), styrene/isoprene/styrene block copolymer (SIS), and 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), acrylonitrile-ethylene propylene rubber-styrene copolymer (AES), and the like. Specific products include the "Clayton D" series manufactured by Clayton Polymer, the "AR-100" series manufactured by Aron Kasei, the "Dialac" series manufactured by UMG ABS, and the "Delpet" series manufactured by Asahi Kasei Chemicals. be done. As the soft styrene-based resin, a styrene-based elastomer to be described later can also be used, such as the "DYNARON" series manufactured by JSR, the "TUFTEC" series manufactured by Asahi Kasei Chemicals, and the "Hibller" series manufactured by Kuraray.

The block copolymer includes pure block, random block, tapered block, etc., and the form of copolymerization is not particularly limited. In addition, the block unit may also include a number of repeating units. Specifically, in the case of styrene-butadiene block copolymers, there are many block units such as styrene-butadiene copolymers, styrene-butadiene-styrene block copolymers, and styrene-butadiene-styrene-butadiene block copolymers. It doesn't matter if it's repeated.

In addition, hydrogenated styrene-butadiene-styrene block copolymer (SEBS) obtained by hydrogenating part or all of the double bonds of the conjugated diene polymer block of SBS or SIS, hydrogenated styrene-isoprene-styrene block Copolymers (SEPS) can also be used. Specific products include the "Tuftech H" series manufactured by Asahi Kasei Chemicals, Inc. and the "Krayton G" series manufactured by Kraton Polymer.

It is also possible to impart a polar functional group to the soft styrene resin. Specific examples of polar functional groups include acid anhydride groups, carboxylic acid groups, carboxylic acid ester groups, carboxylic acid chloride groups, carboxylic acid amide groups, carboxylic acid groups, sulfonic acid groups, sulfonic acid ester groups, sulfone acid chloride group, sulfonic acid amide group, sulfonic acid group, epoxy group, amino group, imide group, oxazoline group and the like. Among these, it is preferable to impart an acid anhydride group or an epoxy group.
Modified products of SEBS and SEPS are preferably used as the soft styrene resin to which a polar functional group is added. Specific examples include maleic anhydride-modified SEBS, maleic anhydride-modified SEPS, epoxy-modified SEBS, and epoxy-modified SEPS. Specific products include the "Tuftec M" series manufactured by Asahi Kasei Chemicals, the "Dynalon" series manufactured by JSR, and the "Epofriend" series manufactured by Daicel Chemical Industries.

Also, the soft styrene resin may be a styrene elastomer containing an elastomer component. Specifically, among the above, block copolymers such as styrene components and butadiene, isoprene and 1,3-pentadiene can be mentioned, and modified products and hydrogenated products thereof may also be used. More specifically, SBS, SIS, SEBS, SEPS and the like are included.

Elastomers other than styrene-based elastomers may be used, and known ones 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. mentioned. Elastomers are generally thermoplastic elastomers. The elastomer is preferably a polyester-based elastomer or the above-described styrene-based elastomer.

The polyester-based elastomer is a thermoplastic polyester having rubber properties at room temperature, preferably a thermoplastic elastomer containing a polyester-based block copolymer as a main component, and a hard segment comprising an aromatic polyester having a high melting point and high crystallinity. A block copolymer having an amorphous polyester or an amorphous polyether as a soft segment is preferred. The soft segment content of the polyester elastomer is at least 20 to 95 mol% of all segments, and in the case of a block copolymer of polybutylene terephthalate and polytetramethylene glycol (PTMG-PBT copolymer), it is 50 to 95 mol%. 95 mol %. The preferred soft segment content is 50 to 90 mol %, especially 60 to 85 mol %. Among them, polyester ether block copolymers, particularly PTMG-PBT copolymers, are preferred.

A core-shell type elastomer is composed of an innermost layer (ie, core) and one or more outer layers (ie, shell) covering it. The core-shell type elastomer is preferably a core-shell type graft copolymer in which a graft-copolymerizable monomer component is graft-copolymerized as a shell to a core.

A core-shell type graft copolymer generally has a polymer component called a rubber component as a core. In the core-shell type graft copolymer, it is preferable that a core-constituting polymer component and a monomer component copolymerizable with this polymer component are graft-copolymerized as a shell.
The method for producing the core-shell type graft copolymer may be bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, or the like. may However, a commercially available core-shell type elastomer can usually be used as it is. Commercially available core-shell type elastomers are exemplified later.

Specific examples of the polymer component forming the core include butadiene rubber such as polybutadiene and styrene-butadiene copolymer, isoprene rubber, polybutyl acrylate, poly(2-ethylhexyl acrylate), butyl acrylate/2-ethylhexyl acrylate. Silicone rubbers such as acrylic rubbers such as copolymers, silicone rubbers such as polyorganosiloxane rubbers, butadiene-acrylic composite rubbers, and IPN (Interpenetrating Polymer Network) type composite rubbers composed of polyorganosiloxane rubber and polyalkyl acrylate rubber. Acrylic composite rubbers, ethylene-α olefin rubbers such as ethylene-propylene copolymers, ethylene-butene copolymers, ethylene-octene copolymers, ethylene-acrylic rubbers, fluororubbers, and the like can be mentioned. These may be used alone or in combination of two or more. Among these, at least one selected from butadiene rubbers, acrylic rubbers, silicone rubbers, and silicone-acrylic composite rubbers is preferable in terms of mechanical properties and surface appearance. At least one selected from rubber is more preferable.

Specific examples of the monomer component that constitutes the shell and can be graft-copolymerized with the polymer component of the core include aromatic vinyl compounds; vinyl cyanide compounds; (meth)acrylic acid ester compounds; and (meth)acrylic acid compounds. , (Meth)acrylic compounds such as epoxy group-containing (meth)acrylic acid ester compounds such as glycidyl (meth)acrylate; maleimide, N-methylmaleimide, N-phenylmaleimide and other maleimide compounds; maleic acid, phthalic acid, itacon Examples include α,β-unsaturated carboxylic acid compounds such as acids and their anhydrides (eg, maleic anhydride, etc.). These monomer components may be used singly or in combination of two or more. Among these, aromatic vinyl compounds, vinyl cyanide compounds, and (meth)acrylic compounds are preferable from the viewpoint of mechanical properties and surface appearance, and aromatic vinyl compounds and (meth)acrylic compounds are more preferable. It is a (meth)acrylic acid ester compound.
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, halogenated styrene, etc. Among them, styrene or α-methylstyrene is more preferable.
Specific examples of the (meth)acrylate 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. "(Meth)acryl" is a generic term for "acryl" and "methacryl".

The core-shell type elastomer has at least one polymer component selected from butadiene-based rubber, acrylic rubber, silicone-based rubber, and silicone-acrylic composite rubber as a core, and has (meth)acrylic acid ester or the like around it. A core-shell type graft copolymer comprising a shell formed by graft copolymerizing a (meth)acrylic compound or an aromatic vinyl compound is particularly preferred. The content of the core polymer component in the core-shell graft copolymer is preferably 40% by mass or more, more preferably 60% by mass or more, and more preferably 70% by mass or more. , more preferably 80% by mass or more.
In addition, the total content of the (meth)acrylic compound (among them, the (meth)acrylic acid ester) component and the aromatic vinyl compound component in the shell of the core-shell type graft copolymer is 30% by mass or more. is preferably 50% by mass or more, 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.

Preferred specific examples of the core-shell type elastomer include methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), and 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 , methyl methacrylate-(acrylic/silicone composite rubber) copolymer, and the like.

Commercially available core-shell graft copolymers include, for example, Dow Chemical Japan's "Paraloid EXL2602", "Paraloid EXL2603", "Paraloid EXL2690", "Paraloid EXL2691J", and "Paraloid EXL2650J". Paraloid EXL2655", "Paraloid EXL2311", "Paraloid EXL2313", "Paraloid EXL2315", "Paraloid KM330", "Paraloid KM336P", "Paraloid KCZ201", Mitsubishi Chemical "Metabrene C-223A", "Metablen E- 901", "Metabrene S-2001", "Metabrene W-450A", "Metabrene SRK-200", "Metabrene E-870A", Kaneka's "Kaneace M-210", "Kaneace 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", "Kane Ace M-300", etc. be done.
These impact modifiers such as core-shell type graft copolymers may be used singly or in combination of two or more.

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 influence caused by external impact is moderately reduced, and bending resistance and the like are likely to be improved. In addition, it is possible to prevent deterioration in softening property and fluidity during film heating due to the type of resin used and the blending of a large amount of filler, thereby making it easy to maintain good workability.
On the other hand, by making it 30% by mass or less, it is possible to exhibit an effect commensurate with the content. In addition, it is possible to prevent deterioration of various physical properties such as heat resistance of the present film and excessive increase in fluidity during processing of the present film.
From these viewpoints, the content of the impact modifier in the entire film is more preferably 1.5% by mass or more, more preferably 2% by mass or more, even more preferably 2.5% by mass or more, and 3% by mass or more. is particularly preferred. Further, it is more preferably 20% by mass or less, further preferably 15% by mass or less, even more preferably 10% by mass or less, particularly preferably 8% by mass or less, and 6% by mass. Most preferably:

When the present film is a laminated film and contains an impact modifier, at least one layer may contain the impact modifier. Although all layers of the laminated film may contain the impact modifier, it is preferable that at least the surface layer constituting the outermost layer of the film contains the impact modifier.
Therefore, in a laminated film having a surface layer/intermediate layer/surface layer structure, both surface layers preferably contain an impact modifier, and therefore both surface layers contain an impact modifier in addition to the resin and filler. is preferred. On the other hand, the middle layer preferably contains a resin and a filler, but preferably does not contain an impact modifier, or, even if it does contain an impact modifier, it preferably contains a smaller amount of the impact modifier than both surface layers. .
In this way, by including a relatively large amount of filler in both surface layers, bending resistance and impact resistance can be improved and workability can be improved without increasing the content of the impact modifier in the entire film. By improving the properties, it becomes easy to improve the embedding properties of IC chips and the like.

The content of the impact modifier in each of both surface layers is preferably 2% by mass or more, more preferably 4% by mass or more, still more preferably 6% by mass or more, and even more preferably 8% by mass or more, based on the mass of each layer. Also, it 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 the impact modifier in the middle layer should be less than the content of the impact modifier in each of the two surface layers based on the mass of each layer, preferably less than 4% by mass, more preferably less than 4% by mass. Less than 2% by mass, more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and most preferably 0% by mass.

[Heat stabilizer/antioxidant (additive (X))]
The film preferably contains at least one additive (X) selected from heat stabilizers and antioxidants. This film contains a large amount of filler as described above, so that foaming may occur and the appearance may be poor. Appearance can be improved.
The present film may contain one or both of a heat stabilizer and an antioxidant as the additive (X), but preferably contains at least a heat stabilizer. Combined use is more preferable.

(Heat stabilizer)
Thermal stabilizers include, for example, phosphorus compounds. A known compound can be used as the phosphorus compound. Specific examples include phosphorus oxo acids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid, acidic pyrophosphate metal salts such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate, and phosphoric acid. Phosphates of group 1 or group 2B metals such as potassium, sodium phosphate, cesium phosphate and zinc phosphate, organic phosphite compounds, organic phosphate compounds, organic phosphonite compounds and the like. In addition, metal salts may be used for organic phosphate compounds, organic phosphite compounds, organic phosphonite compounds, and the like.

Examples of organic phosphite compounds include triphenylphosphite, tris(monononylphenyl)phosphite, tris(monononyl/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, monooctyl Diphenylphosphite, dioctylmonophenylphosphite, monodecyldiphenylphosphite, didecylmonophenylphosphite, tridecylphosphite, trilaurylphosphite, tristearylphosphite, 2,2-methylenebis(4,6-di- tert-butylphenyl)octylphosphite, 4,4′-butylidene-bis(3-methyl-6-t-butylphenyl-di-tridecylphosphite), cyclic neopentanetetraylbis(2,6-di -t-butyl-4-methylphenylphosphite), 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro Examples include various phosphites such as [5,5]undecane. Among these, trialkyl phosphites such as tristearyl phosphite are preferred.

Phosphites having at least one oxetane group can also be used as organic phosphite compounds. Such oxetane group-containing phosphites may have one, two or three oxetane groups.
Examples of oxetane group-containing phosphites are 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 -hexadecyloxetan-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))-oxymethyl]oxetane and P,P′-[(1-methylethylidene)-di-4,1-phenylene]-P,P,P′,P '-tetrakis[(3-ethyl-3-oxetanyl)methyl]phosphite, and the oxetane group-containing phosphites described in US Pat. By using the containing phosphite ester, it becomes easy to increase the color intensity after the dye develops color.

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 at least one selected from Periodic Table Ia, IIa, IIb, IIIa and IIIb. Metals are more preferred, among which magnesium, barium, calcium, zinc and aluminum are more preferred, and magnesium, calcium and zinc are particularly preferred.
Moreover, as an organic phosphoric acid ester compound, an acidic organic phosphoric acid ester and a metal salt thereof are preferable. Examples of acidic organic phosphoric acid esters include dialkyl acid phosphates, monoalkyl acid phosphates, diaryl acid phosphates, monoalkyl monoaryl acid phosphates, and the like. The alkyl group in the acidic organic phosphoric acid ester is, for example, an alkyl group having 1 to 30 carbon atoms, preferably 2 to 25 carbon atoms, more preferably 6 to 23 carbon atoms. Also, the number of carbon atoms in the aryl group may be about 6 to 30.

Preferred specific examples of organic phosphoric acid ester compounds include distearyl acid phosphate and monostearyl acid phosphate as acidic organic phosphoric acid esters. In addition, as metal salts of acidic organic phosphates, bis(distearyl acid phosphate) zinc salt, monostearyl acid phosphate zinc salt, tris(distearyl acid phosphate) aluminum salt, monostearyl acid phosphate and two Salts with monostearyl acid phosphate aluminum salt, monostearyl acid phosphate, distearyl acid phosphate and the like. Among these, distearyl acid phosphate and monostearyl acid phosphate are more preferable.

Examples of organic phosphonite compounds include tetrakis(2,4-di-iso-propylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,4-di-n-butylphenyl)-4,4'-biphenyl diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,3'-biphenylenediphosphonite night, tetrakis(2,4-di-tert-butylphenyl)-3,3'-biphenylenediphosphonite, tetrakis(2,6-di-iso-propylphenyl)-4,4'-biphenylenediphosphonite, 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'-biphenylenediphosphonite and tetrakis(2,6-di-tert-butylphenyl)-3,3'-biphenylenediphosphonite.

Among the above phosphorus-based compounds, at least one selected from organic phosphite compounds and organic phosphoric acid ester compounds is preferable from the viewpoint of improving thermal stability, suppressing oxidation, and suppressing foaming. Further, the organic phosphite compound is preferably used in combination with an antioxidant described later, and more specifically, it is more preferably used in combination with a phenolic antioxidant. By using together with a phenolic antioxidant, foaming generated in the present film can be effectively suppressed. In addition, it is possible to effectively suppress the reduction in molecular weight and yellowing of the resin during extrusion film formation, and it is also possible to achieve both stability during extrusion film formation and long-term stability as a molded product.

In addition, the phosphorus-based compound can also be used as an ester exchange inhibitor capable of inhibiting the ester exchange reaction between the polyester resin and the polycarbonate resin. Therefore, when the film contains both a polyester resin and a polycarbonate resin as resins, transesterification in the film can also be prevented. Further, when the film contains a polyester resin or a polycarbonate resin, transesterification with the polycarbonate resin or polyester resin contained in the layer adjacent to the film can also be prevented in the laminate containing the film. can.
The present film may use one of the heat stabilizers described above, or may use two or more of them in combination.

(Antioxidant)
As the antioxidant, for example, a phenol-based antioxidant, a sulfur-based antioxidant, and the like can be used. Among them, phenolic antioxidants are preferred.

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), propionic acid stearyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) and the like. Among them, 2,6-di-tert-butyl-4-methylphenol (dibutylhydroxytoluene, BHT) is preferred.

Sulfur antioxidants include thiodipropionic acid, dilaurylthiodipropionate, distearylthiodipropionate, laurylstearylthiodipropionate, dimyristylthiodipropionate, distearyl-β,β'-thio dibutyrate, thiobis(β-naphthol), thiobis(N-phenyl-β-naphthylamine, 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, nickel dibutyldithiocarbamate, etc. mentioned.

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

In this film, foaming tends to occur when a polycarbonate resin having a high molecular weight is used as the resin. Therefore, when using a high-molecular-weight polycarbonate resin having a high molecular weight as the resin used in the present film, it is preferable to incorporate the additive (X). Specifically, the high molecular weight polycarbonate resin is a polycarbonate resin having a mass average molecular weight of 58,000 or more, preferably a polycarbonate resin having a mass average molecular weight of 60,000 or more, and more preferably having a mass average molecular weight of 63,000 or more and 120,000 or less. Polycarbonate resin. Therefore, in the case of a laminated film, it is preferable to incorporate the additive (X) into a layer in which a high-molecular-weight polycarbonate resin is used as the resin.
In addition, when a large amount of filler is contained, specifically, the filler in the entire film is more than 30% by mass, further 31% by mass or more, further 33% by mass or more, further more than 35% by mass, further more than 36% by mass. If it contains 37% by mass or more, further 39% by mass or more, and especially 40% by mass or more, mechanical properties such as impact resistance, dynamic bending durability, and toughness tend to decrease. Therefore, it is preferable to use a polycarbonate resin having a high molecular weight as described above.

On the other hand, in the present film, when a low-molecular-weight polycarbonate resin having a low molecular weight is used as the polycarbonate resin, the additive (X) does not have to be contained because foaming is less likely to occur. Similarly, in the case of a laminated film, the layer in which a low-molecular-weight polycarbonate resin is used as the polycarbonate resin may not contain the additive (X).
The low molecular weight polycarbonate resin is specifically a polycarbonate resin having a weight average molecular weight of less than 58000, preferably a polycarbonate resin having a weight average molecular weight of 56000 or less, more preferably a weight average molecular weight of 20000 or more and 54000. It is the following polycarbonate resin.

The content of the additive (X) in the entire film is preferably 0.01% by mass or more and 3% by mass or less based on the total amount of the film. By setting the content of the additive (X) to 0.01% by mass or more, the effect of containing the additive (X) can be exhibited appropriately, and for example, foaming can be effectively suppressed. Moreover, by making it 3 mass % or less, the effect corresponding to content can be exhibited.
From these viewpoints, the content of the additive (X) is more preferably 0.05% by mass or more, more preferably 0.1% by mass or more, more preferably 2% by mass or less, and further preferably 1% by mass or less. Preferably, 0.6% by mass or less is even more preferable.

In this film, as described above, a heat stabilizer and an antioxidant may be used in combination as the additive (X). In that 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, still more preferably 3/7 or more and 7/3 or less.

When the present film is a laminated film, the type of additive (X) contained in each layer of the laminated film may be different from each other, or may be the same. In the case of a laminated film, the content of the filler in each layer may be adjusted so that the content of the filler in the entire film is within the above range. However, the preferred upper and lower limits of the content of the additive (X) and the preferred range of the mass ratio (antioxidant/thermal stabilizer) in each layer containing the additive (X) are as described above. It is the same as the preferred upper limit and lower limit of the content of the additive (X) in the entire film and the preferred range of the mass ratio (antioxidant/thermal stabilizer).

[Antistatic agent]
The film may contain an antistatic agent. By containing an antistatic agent, this film suppresses charging during transport or when stacked on other films, and it is difficult to adhere to the press plate during hot press, etc., and is easy to handle. tend to improve. In addition, since the surface resistivity of the film is low, static electricity is less likely to occur when the film is unwound from the film roll, sparks are generated during unwinding, and the surface of the film, etc. is scratched, and the film meanders when the film is unwound. Alternatively, it is possible to effectively prevent the occurrence of displacement, twisting, wrinkles, etc. due to skewing. Therefore, the handleability and workability are improved. In addition, when the surface resistivity is low, floating dust is attracted by static electricity and adheres to the surface of the film, etc., resulting in the problem that foreign matter is mixed in the laminated film, cards, passports, and other products obtained. It becomes difficult and dust resistance is improved.
Examples of antistatic agents include low-molecular-weight antistatic agents and high-molecular-weight antistatic agents. These may be of the ion-conducting type or the electronic-conducting type.

Low-molecular-weight antistatic agents include, for example, anionic antistatic agents; cationic antistatic agents; nonionic antistatic agents; amphoteric antistatic agents; complex compounds; Alkoxides, derivatives thereof; coated silica and the like can be mentioned.
The amphoteric antistatic agent may be of the betaine type, or may be of a non-betaine type, as long as it is an antistatic agent composed of a cation and an anion, and may be an ionic liquid.
The polymeric antistatic agent may be, for example, various polymers such as a vinyl copolymer having a metal sulfonate such as a metal alkylsulfonate or a metal alkylbenzenesulfonate in the molecule, or a betaine type antistatic agent. There may be. Polyamide elastomers, polyester elastomers, and the like can also be used.
An antistatic agent can be used individually by 1 type or in combination of 2 or more types.

Among the above, the antistatic agent is preferably an antistatic agent composed of a cation and an anion. Specifically, an anion selected from a sulfonimide anion containing a fluorine atom and a sulfonate anion containing a fluorine atom, and a phosphonium cations, ammonium cations, imidazolium cations and cations selected from pyridinium cations.
The antistatic agent composed of cations and anions is preferably an ionic liquid. The ionic liquid itself has high conductivity and is a liquid at around room temperature, so it has excellent dispersibility and exhibits higher antistatic performance. In addition, it is possible to impart excellent antistatic performance while having excellent heat resistance and suppressing deterioration in physical properties due to thermal decomposition of the antistatic agent. Note that the ionic liquid is a compound that consists only of ions and has a melting point of 100° C. or lower.

The anions selected from the fluorine atom-containing sulfonimide anions and the fluorine atom-containing sulfonate anions preferably include anions selected from perfluoroalkylsulfonimide anions and perfluoroalkylsulfonate anions. When the anion contains a fluorine atom, particularly a perfluoroalkyl group, the migration of the ionic liquid to the surface of the film tends to be improved. Therefore, it becomes possible to impart high antistatic performance with a lower addition amount.

As the antistatic agent composed of an anion and a cation, an antistatic agent represented by the following formula (4) is preferable.
[(R ₁₁ ) ₄ P ⁺ ]·(R ₁₂ SO ₂ )(R ₁₂ SO ₂ )N ⁻ (4)
(In formula (4) above, R ₁₁ each independently represents a hydrocarbon group, and R ₁₂ each independently represents a hydrocarbon group containing a fluorine atom.)

In formula (4), each R ₁₁ is preferably independently selected from a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkenyl group, and an aryl group. An alkyl group is more preferred, and a straight-chain alkyl group is even more preferred. Each R ₁₁ may have a substituent, but it is preferable not to have one.
The number of carbon atoms constituting the hydrocarbon group of R ₁₁ 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. The hydrocarbon group is preferably an alkyl group as described above, and therefore R ₁₁ is most preferably an alkyl group having 1 to 4 carbon atoms. A plurality of R ₁₁ in one molecule may be the same or different.
When a plurality of R ₁₁ in one molecule are different, the number of carbon atoms constituting the hydrocarbon group of three R ₁₁ is the same, and the number of carbon atoms constituting the hydrocarbon group of the other one R ₁₁ is different. is preferred. The number of carbon atoms constituting the three R ₁₁ hydrocarbon groups is, for example, 9 or less, preferably 4 to 9, more preferably 5 to 8, and even more preferably 6 to 7. The number of carbon atoms constituting the other one R ₁₁ hydrocarbon group is, for example, 10 or more, preferably 10 to 18, more preferably 11 to 16, even more preferably 12 to 14. The hydrocarbon group is preferably an alkyl group as described above.

R ₁₂ is 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 , a straight-chain or branched alkyl group containing a fluorine atom is more preferable, and a straight-chain alkyl group containing a fluorine atom is more preferable.
In each R ₁₂ , the number of carbon atoms constituting the hydrocarbon group is preferably 1-10, more preferably 1-6, still more preferably 1-4, and even more preferably 1-3.
More specifically, each R ₁₂ is preferably a perfluorohydrocarbon group, more preferably a perfluoroalkyl group, even more preferably a perfluoromethyl group or a perfluoroethyl group, and a perfluoroethyl group. A fluoromethyl group is more preferred.
A plurality of R ₁₂ in one molecule may be the same or different.

The antistatic agent represented by Formula (4) is preferably a compound represented by Formula (5) below.

In a film having a single layer structure, the single layer preferably contains an antistatic agent. In the laminated film, the antistatic agent may be contained in at least one layer of the laminated film, and may be contained in all layers. However, the antistatic agent is preferably contained in the surface layer. Therefore, in a laminated film having a surface layer/intermediate layer/surface layer structure, both surface layers preferably contain an antistatic agent. By containing an antistatic agent in both surface layers, it becomes easier to obtain the above-described effects such as the effective suppression of electrification in the present film and the improvement of handleability.

The content of the antistatic agent in each layer containing the antistatic agent is preferably 0.1% by mass or more and 3% by mass or less when the antistatic agent is composed of a cation and an anion, and 0.2% by mass. 0.3 mass % or more and 2 mass % or less is more preferable, and 0.4 mass % or more and 1.5 mass % or less is still more preferable. In the case of other antistatic agents, the content of the antistatic agent in each layer is preferably 0.1% by mass or more and 5% by mass or less, more preferably 0.2% by mass or more and 4% by mass or less, and 0.4 It is more preferably from 0.5% by mass to 3% by mass, and even more preferably from 0.5% by mass to 2% by mass.

(other ingredients)
The film may contain additives other than those mentioned above (other additives) commonly used in card or passport films. Other additives include lubricants, process stabilizers, UV absorbers, light stabilizers, matting agents, processing aids, metal deactivators, residual polymerization catalyst deactivators, antibacterial/antifungal agents, and antiviral agents. , flame retardants and the like. In addition, when the present film is a laminated film, at least one of the layers constituting the laminated film may contain at least one of the above-described other additives, and all layers may contain other additives. It may contain at least one of the agents.

The thickness of the present film is not particularly limited, and may be appropriately adjusted depending on the purpose of use. For example, it is 300 μm or less, preferably 250 μm or less, more preferably 200 μm or less, and still more preferably 170 μm or less. By setting the thickness of the present film to a certain value or more, it becomes easier to ensure the concealability. On the other hand, by setting the thickness to a certain value or less, it becomes easier to make cards and passports thinner, and it becomes easier to add a layer such as a security function to the transparent layer.

In addition, when the present film has a structure of surface layer/middle layer/surface layer, the thickness ratio of each surface layer to the middle layer (each surface layer/middle layer) is preferably 0.03 or more and 0.85 or less, more preferably 0.05 or more. It is 0.7 or less, more preferably 0.1 or more and 0.5 or less, and still more preferably 0.15 or more and 0.35 or less. By setting the thickness ratio within the above range, it becomes easy for the surface layer and the intermediate layer to exhibit appropriate functions. For example, as described above, by including the impact modifier in the surface layer and increasing the content thereof from the middle layer, the impact modifier is used while suppressing the content of the impact modifier in the entire film. effect can be effectively exhibited.

(Light transmission density of this film)
The light transmission density of this film is preferably 0.8 or more. By setting the light transmission density to 0.8 or more, the film has a high concealing property, and the inlet such as an IC chip can be appropriately concealed by the film. From the viewpoint of increasing the hiding power of the present film, the light transmission density of the present film is more preferably 0.85 or higher, still more preferably 0.9 or higher, still more preferably 0.95 or higher, and even more preferably 0.95 or higher. 97 or more, particularly preferably 1 or more, most preferably 1.05 or more. Although the upper limit of the light transmission density is not particularly limited, it is, for example, 3 or less, and may be 2.5 or less from the viewpoint of preventing the film from becoming thicker than necessary. The light transmission density can be measured by the method described in Examples.

(Manufacturing method for card or passport film)
The card or passport film (present film) can be produced by a known method, but it is preferable to obtain a resin composition for forming the present film and to form the resin composition into a film. The resin composition is prepared by mixing raw materials constituting the resin composition, such as resin, filler, and optionally blended impact modifier, additive (X), antistatic agent, and other components. get it.
The raw materials may be mixed by melting and kneading them while heating in an extruder, plastomill, or the like, but the raw materials constituting the resin composition may be dry-blended in a tumbler or the like and used as they are.
The method of forming the resin composition into a film is not particularly limited, and may be press molding or extrusion molding, but extrusion molding is preferred from the standpoints of productivity and cost.

Further, when the present film is a laminated film, a resin composition for forming each layer is prepared, and a plurality of resin layers are laminated by a known lamination method while forming each resin layer from each resin composition. may be formed by Alternatively, a resin composition for forming another resin layer may be melt-extruded and laminated on a resin film formed from any resin composition. Moreover, it is good also as a multilayer structure by co-extrusion. It is preferable to employ a co-extrusion method from the viewpoint of productivity, cost, and the like.
In the laminated film, the resin composition for forming each layer is preferably obtained by mixing the components for forming each layer according to the composition of each layer.
For example, in a laminated film having a surface layer/middle layer/surface layer structure, a surface layer resin composition containing at least a resin for forming a surface layer and a filler, at least a resin for forming a middle layer, and a filler It is preferable to prepare a resin composition for an intermediate layer containing the material and to form a laminated film using the resin composition.

<Card or Passport>
This film is a film used for cards or passports. Cards include IC cards, magnetic cards, driver's licenses, residence cards, qualification certificates, employee ID cards, student ID cards, my number cards, seal registration certificates, car inspection certificates, tag cards, prepaid cards, cash cards, credit cards, ETC card, SIM card, B-CAS card and the like are listed.
A card or passport (more particularly a data page of a passport) may comprise a core sheet. Also, the card or passport data page may comprise a laser marking sheet, a printing sheet and/or a protective sheet in addition to the core sheet. Passport data pages or cards are manufactured by superimposing a core sheet and one or more sheets selected from sheets other than the above-mentioned core sheets, pressing and heat-sealing them, and then punching them. good. Alternatively, the sheets may be adhered to each other by appropriately using an adhesive or the like instead of heat fusion.

In the present invention, a card or passport is provided with the film as described above. A card or passport usually comprises a plurality of resin films, at least one of which is preferably composed of the present film, and the present film is preferably used as a core sheet in the card or passport. Among others, the present film preferably constitutes an inlet sheet in which inlets such as an IC chip and an antenna are built, and more preferably constitutes an IC sheet in which an IC chip is built.

Since the present film has a high concealing property, when it is used for a core sheet, especially an inlet sheet such as an IC sheet, it can adequately conceal an inlet such as an IC chip and an antenna even if the inlet sheet is thin.
In addition, when the present film contains an impact modifier as described above, it is possible to prevent deterioration in softening and fluidity during heating due to the blending of a large amount of filler, and to maintain good workability. Therefore, by containing an impact modifier, the present film is less prone to problems such as difficulty in embedding IC chips even when used as an inlet sheet.
When this film is used as an inlet sheet such as an IC sheet, it is preferable to laminate two or more sheets, more preferably three or more sheets, and even more preferably four or more sheets. In the case of lamination, the main sheet and the main sheet may be directly laminated, or other layers such as an adhesive layer may be present as necessary. By laminating the present film to form an inlet sheet in this way, there is an advantage that it is easier to embed an inlet such as an IC chip or an antenna, as compared with an inlet sheet with a single layer of the present film. IC chips and the like are available in various thicknesses. For example, by configuring an inlet sheet as shown in FIG. Another advantage is that the thickness of the film can be adjusted. In addition, since the films on both surfaces of the inlet sheet are arranged above and below the IC chip and the like, there is an advantage that the inlet of the IC chip and the like can be appropriately hidden.

In addition, when two or more sheets of the present film are laminated to form an inlet sheet in this way, other resin films, such as laser marking sheets and printing sheets, can be laminated to make actual products such as cards and passports. There is also an advantage that it is easy to adjust the total thickness of the product when making it.

FIG. 1 shows an example of an IC sheet as an inlet sheet to which this film is applied. As shown in FIG. 1, an IC sheet (inlet sheet) 11 is formed by laminating a plurality of resin films 10 so that an inlet such as an IC chip 12 is incorporated. It is preferable that the inlet is sandwiched between the resin films 10, laminated, and integrated by heat sealing or the like.
In FIG. 1, the IC sheet (inlet sheet) 11 is formed of four resin films 10, but the number of resin films 10 may be any number as long as it is two or more. Also, although only the IC chip 12 is shown as an inlet, an inlet other than the IC chip 12 such as an antenna may be provided.
Furthermore, at least one of the plurality of resin films 10 is appropriately cut according to the shape of the inlet (for example, the IC chip 12) so that the inlet can be properly embedded in the hollow portion or the inside. A notch may be provided, and the inlet may be arranged in the hollow portion or the notch, and then a plurality of resin films may be laminated and integrated. For example, in the example of FIG. 1, of the four resin films 10, two resin films 10 on the inner side may be provided with a hollow portion for arranging the IC chip 12 therein.

In the inlet sheet such as the IC sheet 11, at least one of the plurality of resin films 10 may be the above film. Therefore, for example, some of the plurality of resin films 10 (for example, the resin films provided on both surfaces in the configuration of FIG. 1) may be the present film, but all of them may be the above-described present film. may As described above, since the present film has a high concealing property, it can appropriately conceal the inlet such as the IC chip 12 by using it as part or all of the inlet sheet such as the IC sheet 11 .

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, still more preferably 280 μm to 420 μm. By setting the thickness of the inlet sheet to 100 μm or more, the inlet such as an IC chip can be appropriately hidden by the inlet sheet. Further, by setting the thickness to 500 μm or less, it becomes easy to impart various functions to the data page or card by increasing the thickness of portions other than the inlet sheet without making the data page or card of the passport unnecessarily thick.

In passports or cards, the inlet sheet is preferably used as a core sheet, and a laser marking sheet is further laminated on one or both sides thereof. A laser marking sheet is a sheet on which personal information or the like is printed by laser printing. The personal information is information for identifying the individual of the passport or card owner, such as personal name, personal ID, and card number.

As described above, the present film can improve the printability of the laser marking sheet. Therefore, by laminating the laser marking sheet on the present film, the printability of the laser marking sheet can be improved. In order to further improve the printability of the laser marking sheet, the laser marking sheet is preferably arranged at a position where it is directly laminated on the film, but it does not have to be laminated directly on the film. That is, the present film and the laser marking sheet may be laminated via another layer.
For example, in the IC sheet 11 having the structure 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.

Although the laser marking sheet may be composed of a single resin layer, it is preferably a laminate having a multilayer structure composed of a plurality of resin layers. The laser marking sheet preferably contains a resin layer containing a laser color former. When it consists of a single resin layer, one resin layer preferably contains the laser color former. In the case of a multi-layer structure, the laser marking sheet preferably has a structure in which surface layers are provided on both sides of an intermediate layer, and the intermediate layer contains a laser coloring agent. A laser marking sheet typically constitutes 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 appropriately printed by laser printing. Further, when the thickness is 400 μm or less, it is possible to prevent the passport or card from having an excessive thickness.

The resin used for each resin layer constituting the laser marking sheet is not particularly limited, and may be a polyester resin, a polycarbonate resin, or a combination thereof. It is preferable to use a polycarbonate resin from the viewpoint of. The details of the polyester resin and the polycarbonate resin are as described above.

The laser coloring agent used in the laser marking sheet is not particularly limited as long as it has a function of generating heat when irradiated with a laser beam. It may be one that itself does not develop color. When the laser color former generates heat, it can promote carbonization of the surrounding forming material and improve laser printability. Furthermore, when a self-coloring laser coloring agent is used, the coloration of the laser coloring agent and the coloration of the carbide produced by the carbonization of the forming material synergize to produce a print with a deep color and excellent visibility. . When the laser coloring agent develops a color, the color is not particularly limited, but from the viewpoint of visibility, it is preferable to use a laser coloring agent capable of developing dark colors including black, navy blue, and brown.

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 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, smectite, and the like.
In addition, laser coloring agents other than metal oxides may be used, and metals such as iron, copper, zinc, tin, gold, silver, cobalt, nickel, bismuth, antimony, and aluminum, and their salts such as iron chloride, iron nitrate, and phosphorus. Metal salts such as iron acid, copper chloride, copper nitrate, copper phosphate, zinc chloride, zinc nitrate, zinc phosphate, nickel chloride, nickel nitrate, bismuth subcarbonate, bismuth nitrate, magnesium hydroxide, lanthanum hydroxide, hydroxide Metal hydroxides such as nickel and bismuth hydroxide, and metal borides such as zirconium boride, titanium boride, and lanthanum boride may also be used. Among metal borides, hexaboride has near-infrared absorptivity, and lanthanum hexaboride is preferable because it is excellent in laser light absorption efficiency. In addition, for example, dyes represented by leuco dyes such as fluoran-based, phenothiazine-based, spiropyran-based, triphenylmethphthalide-based and rhodaminelactam-based dyes, and carbon black can also be used.
As the laser coloring agent, 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 is used. is preferred.
A laser coloring agent may be used individually by 1 type, and may use 2 or more types together.

The print sheet is a sheet on which fixed information is printed before stacking and integrating a plurality of sheets. The fixed information is information other than the personal information described above, and is information that does not change even if the card or passport is different. The fixed information may be printed on the printing sheet with known ink such as light or heat curable ink. The printing sheet is a colored sheet, and may be a single-layer resin film or a laminated film consisting of a plurality of resin layers.
A print sheet is a sheet that is placed outside the inlet sheet. Also, when a laser marking sheet is provided, the printing sheet may be provided between the inlet sheet and the laser marking sheet.

Printed sheets for use in passports or cards may be constructed from the present film as described above. Since the printed sheet is made of this film, it has high concealability. Therefore, even if the inlet cannot be sufficiently covered by the inlet sheet, it can be covered by the printed sheet by arranging it outside the inlet sheet. can be done. In addition, when a laser marking sheet is provided, the laser marking sheet may be laminated on the printing sheet. In such a case, the laser marking property of the laser marking sheet can be improved as described above. .

Protective sheets used in passports or cards, also called oversheets, generally constitute the outermost layer in the data pages of cards or passports. Therefore, when a laser marking sheet or a printing sheet is laminated, the protective sheet is preferably laminated on the outside thereof. When the protective sheet is laminated on the outer side of the laser marking sheet, it suppresses so-called "blistering" in which the laser-printed portion foams due to laser light irradiation. The protective sheet may be composed of a single resin layer, or may be a laminate having a multilayer structure composed of a plurality of resin layers. The resin used for each resin layer constituting the protective sheet is not particularly limited, and may be a polyester resin, a polycarbonate resin, or a combination thereof. Polycarbonate resin is preferably used from the viewpoint of properties. The details of the polyester resin and the polycarbonate resin are as described above. In addition, the protective sheet typically constitutes a transparent layer.

The data page of a passport or the layered structure of a card is not particularly limited, but preferably has any one of the following layered structures (1) to (6).
(1) Protection sheet/laser marking sheet/IC sheet (inlet sheet)/printing sheet/protection sheet (2) Protection sheet/laser marking sheet/IC sheet (inlet sheet)/laser marking sheet/protection sheet (3) Protection 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) Protection sheet/laser marking sheet/IC sheet (inlet sheet)/protection sheet (6) Protection sheet/laser marking sheet/printing sheet/IC sheet (inlet sheet)/protection sheet , (1). In addition, in the laminated structures (1) to (6) above, a structure in which protective sheets are provided on both outermost surfaces is shown, but one or both of the protective sheets may be omitted as appropriate.

In addition, passport data pages and cards may be provided with security parts such as lenticular printing, hologram printing, and security threads by special printing. It may be appropriately provided between the marking sheet and the printing sheet, between the laser marking sheet and the inlet sheet, or the like.

A passport may also be provided with a hinge sheet. A hinge sheet is a sheet that plays a role in firmly binding a data page integrally with a passport cover, other visa sheets, or the like. The hinge sheet may be arranged at a position protruding from the inlet sheet so as to be connected to the inlet sheet forming the core sheet, for example. In addition, the hinge sheet may be arranged, for example, between the inlet sheet and the printing sheet, the laser marking sheet, or the protective sheet, and may be laminated in the data page such that a portion of the hinge sheet protrudes from the inlet sheet. good.

Examples and comparative examples are shown below, but the present invention is not limited by these.

The evaluation method is as follows.
(1) Hiding property (light transmission density)
The light transmission densities of the films obtained in Examples and Comparative Examples were measured using a transmission densitometer "341" manufactured by X-Rite. It should be noted that the higher the light transmission density, the higher the hiding power.

(2) Laser-printability A card produced using this film was laser-printed using "CLM-20" manufactured by Nidec Copal Corporation at a reflection density value of 64 μm/Step×50%. , X-Rite Co., Ltd. "eXact" was used to measure the reflection density value of the laser printed portion. The higher the reflection density value, the better the laser printability.
The cards used in the evaluation of laser printability were prepared as follows using the present films obtained in Examples and Comparative Examples and the following laser marking sheets. The laser marking sheet is a sheet with a three-layer structure having surface layers on both sides of a middle layer. It is a layer composed of 0.2% by mass. The laser marking sheet has a total thickness of 50 μm and a thickness ratio of surface layer/intermediate layer/surface layer of 1/4/1.
After laminating the laser marking sheet/this film (15 sheets except for Example 3, and 7 sheets in Example 3)/laser marking sheet in this order, the card was heat-pressed at 175°C using a heat press. The resulting laminate was punched into a card shape (54 mm×85 mm).

Each raw material used in this example is as follows.
PC1: Bisphenol A homopolycarbonate (interfacial polymerization method), mass average molecular weight: about 72000, melt flow rate (300°C, 1.2 kgf): 4 g/10 minutes, glass transition temperature: 150°C
PC2: Bisphenol A homopolycarbonate (interfacial polymerization method), mass average molecular weight: about 53000, melt flow rate (300°C, 1.2 kgf): 15 g/10 minutes, 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 heat stabilizer (tristearyl phosphite) were used in a mass ratio of 1:1.
Heat stabilizer: a mixture of distearyl acid phosphate and monostearyl acid phosphate Impact modifier: core-shell type elastomer, "Metabrene 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

[Example 1]
Each component constituting the A layer was dry-blended according to the formulation shown in Table 1, kneaded using an extruder, and extruded as the A layer (surface layer) from a two-kind, three-layer multi-manifold die at 255°C. bottom. Further, each component constituting the layer B was dry-blended according to the formulation shown in Table 1, kneaded using an extruder, and extruded at 255°C as a layer B (middle layer) from the die. The laminated body in which the extruded layers are laminated is quenched with a casting roll at about 120° C. to obtain the present film consisting of surface layer/intermediate layer/surface layer with a thickness ratio of 1/4/1 and a total thickness of 50 μm. Obtained.

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

[Example 3]
Each component constituting the A layer was dry-blended according to the formulation 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 the A layer. .

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

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

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

As described above, in Examples 1 to 4, by including a large amount of filler in the film, the light transmission density of the film was increased, and the concealability of inlets such as IC chips could be enhanced. On the other hand, although the films of Comparative Examples 1 and 2 contain fillers, their content is not large, so the light transmission density is low, and the concealability of inlets such as IC chips can be sufficiently improved. could not.
Further, in Examples 1 to 4, when laser marking was performed on the laser marking sheet laminated on the film, a large amount of filler was contained in the film, so a comparative example in which a large amount of filler was not contained Compared with the laser marking sheet laminated on the films 1 and 2, the reflection density value was higher and the laser printability could be improved.
In particular, since the present films of Examples 1 and 4 contain the additive (X), and the present film of Example 2 can be extruded at a low temperature because the polycarbonate resin used has a low molecular weight, the sheet Foaming was less likely to occur, and the appearance was better.

10 resin film 11 IC sheet (inlet sheet)
12 IC chip

Claims (12)

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 claim 1, further comprising an impact modifier, wherein the content of said impact modifier is 1% by mass or more and 30% by mass or less. It further contains at least one additive (X) selected from the group consisting of antioxidants and heat stabilizers, and the content of the additive (X) is 0.01% by mass or more and 3% by mass or less. A card or passport film according to claim 1 or 2. The card or passport film according to any one of claims 1 to 3, wherein said filler has a refractive index of 2 or more. A card or passport film according to any one of the preceding claims, wherein said filler comprises titanium oxide. The card or passport film according to any one of claims 1 to 5, wherein said resin is at least one selected from the group consisting of polycarbonate resin and polyester resin. An intermediate layer containing the resin and the filler, and both surface layers provided on both sides of the intermediate layer,
A card or passport film according to any one of the preceding claims, wherein each of said surface layers contains said resin, said filler and an impact modifier. The card or passport film according to any one of claims 1 to 7, which is used for a core sheet. An inlet sheet comprising the card or passport film according to any one of claims 1-8. 10. The inlet sheet according to claim 9, having a thickness of 100 [mu]m or more and 500 [mu]m or less. A card comprising the card or passport film according to any one of claims 1 to 8 or the inlet sheet according to claim 9 or 10. A passport comprising a card or passport film according to any one of claims 1 to 8 or an inlet sheet according to claim 9 or 10.

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