Polyester film for window coverings, and laminate of polyester film for window coverings

Abstract

To provide a polyester film for application to windows that does not damage the environment during its disposal and has excellent light resistance.SOLUTION: A polyester film for application to windows comprises a halogen-free blue dye, a pigment and a copolyester having a benzotriazol group.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a polyester film for window application, used by laminating it onto window glass such as automobile windows or building windows, and a laminate of the polyester film for window application. [Background technology]

[0002] Generally, films are applied to car windows, building windows, etc., for purposes such as privacy protection, aesthetics, sunlight control, and glass shatter prevention. Polyester is a common material for such films, as it has excellent transparency, light resistance, water resistance, heat resistance, chemical resistance, and mechanical strength, and is usually used as a colored film with transparency, containing colorants.

[0003] As an example of such a film, Patent Document 1 proposes a window film having a transparent first outer layer containing polyethylene terephthalate (PET), a dyed core layer containing PET and one or more dyes selected from pigment yellow 147, pigment red 177, pigment blue 60, pigment black 31, pigment red 149, and pigment red 122, and a transparent second outer layer containing PET, which has excellent resistance to fading (lightfastness) of the colorants due to light irradiation. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Special Publication No. 2017-509517 [Overview of the project] [Problems that the invention aims to solve]

[0005] Incidentally, blue pigments are sometimes used as colorants for the above-mentioned applications. To improve lightfastness and other properties, blue pigments with halogen groups incorporated into their structure are sometimes used. However, films using colorants with halogen groups are undesirable from the standpoint of environmental pollution (environmental burden) during disposal; therefore, in recent years, there has been a growing demand for the use of halogen-free blue pigments. However, according to the inventors' research, halogen-free blue pigments have poor lightfastness, and colored films using such blue pigments have the problem of fading when exposed to light. Therefore, a method has been devised to improve lightfastness by using ultraviolet absorbers in combination. However, adding large amounts of UV absorbers to a film can lead to problems such as a decrease in the film's mechanical strength, or the volatilization of the UV absorbers and bleed-out onto the film surface when exposed to the outdoors for extended periods. Furthermore, depending on the application, it may be necessary to use thin resin films (e.g., 30 μm or less), which naturally limits the amount of UV absorber that can be added to the film, making it difficult to obtain the desired light resistance. This invention has been made in view of the above-mentioned conventional problems, and aims to provide a polyester window film that does not have adverse effects on the environment when disposed of and has excellent light resistance. [Means for solving the problem]

[0006] As a result of diligent research, the inventors have discovered that by using a combination of halogen-free blue dyes and pigments, and by including a copolymer polyester having a benzotriazole group, a polyester film with excellent lightfastness that does not adversely affect the environment when disposed of can be obtained, and have completed the present invention as described below. In other words, the present invention relates to the following [1] to

[16] . [1] A polyester film for window coverings comprising a halogen-free blue dye, a pigment, and a copolymer polyester having a benzotriazole group.

[0007] [2] The polyester film for window covering according to [1], comprising a polyester layer (A) and a polyester layer (B) on at least one surface of the polyester layer (A).

[0008] [3] The polyester film for window covering according to [2] above, wherein the ratio of the thickness of the polyester layer (B) to the polyester layer (A) [(B) / (A)] is 0.05 to 0.5.

[0009] [4] The polyester film for window covering according to [2] or [3] above, wherein the polyester layer (A) contains the halogen-free blue dye and pigment, and the content of the halogen-free blue dye in the polyester layer (A) is 0.01 to 2% by mass.

[0010] [5] The polyester film for window covering according to [4] above, wherein the pigment content in the polyester layer (A) is 0.001 to 1.2% by mass.

[0011] [6] The polyester window film according to any one of [1] to [5] above, wherein the halogen-free blue dye is a halogen-free anthraquinone-based blue dye.

[0012] [7] The polyester window film according to [6] above, wherein the halogen-free anthraquinone blue dye is a compound represented by the following general formula (I). [ka] (In the formula, R 1 and R 4 Each of these independently represents a substituted or unsubstituted amino group, R 2 , R 3 , R 5 ~R 8 Each of these independently represents a hydrogen atom or a substituent, R 2 and R 3 They may be bonded to each other, forming a ring.

[0013] [8] The polyester film for window pasting according to [7] above, wherein the halogen-free anthraquinone-based blue dye is a compound represented by the following general formula (III-a) or a compound represented by the following general formula (IV). [Chemical formula] (In the formula, X 11 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.) [Chemical formula] (In the formula, X 21 to X 24 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.)

[0014] [9] The polyester film for window pasting according to any one of [1] to [8] above, wherein the pigment is carbon black.

[0015]

[10] The polyester film for window pasting according to any one of [1] to [8] above, wherein the pigment is silica and / or alumina.

[0016]

[11] The polyester film for window pasting according to any one of [1] to

[10] above, which contains at least one selected from the group consisting of cesium tungstate, indium tin oxide, antimony tin oxide, and lanthanum hexaboride as an infrared absorber.

[0017]

[12] The polyester film for window pasting according to

[11] above, wherein the average transmittance at 900 nm to 2500 nm is 70% or less.

[0018]

[13] A laminate of a polyester film for window application, comprising a polyester film for window application described in any one of [1] to

[12] above, and a hard coat layer provided on the surface of the polyester film for window application.

[0019]

[14] A laminate of a polyester film for window application, comprising a polyester film for window application described in any one of [1] to

[12] above, and an adhesive layer provided on the surface of the polyester film for window application.

[0020]

[15] The window-applied polyester film laminate according to

[13] , wherein an adhesive layer is provided on the side opposite to the side of the window-applied polyester film on which the hard coat layer is provided.

[0021]

[16] The polyester film laminate for window application according to

[14] or

[15] , further comprising a release film on the surface of the adhesive layer. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a polyester window film that does not have an adverse impact on the environment when disposed of and has excellent light resistance. [Modes for carrying out the invention]

[0023] [Polyester film for window coverings] The polyester film for window coverings of the present invention comprises a halogen-free blue dye, pigment, and a copolymer polyester having a benzotriazole group. According to the present invention, since a halogen-free blue dye is used as the colorant, the adverse environmental impact when disposing of the polyester film for window coverings (hereinafter also simply referred to as "polyester film") can be reduced. Furthermore, because a combination of a halogen-free blue dye and a pigment is used, haze can be kept low, and because a copolymer polyester having a benzotriazole group is included, the light resistance of the polyester film can be improved. The configuration of the present invention will be described in detail below.

[0024] <Polyester> The polyester film of the present invention must contain a copolymer polyester having a benzotriazole group. Preferably, the polyester film of the present invention is formed by laminating polyester layers. There are no particular restrictions on the polyester used as the raw material for the polyester layer of the polyester film of the present invention, but it is preferably a polycondensation polymer of a dicarboxylic acid and a diol. Aromatic dicarboxylic acids are preferred as the dicarboxylic acid, and aliphatic diols are preferred as the diol. Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, orthophthalic acid, biphenyldicarboxylic acid, diphenyl ether-dicarboxylic acid, diphenyl sulfone-dicarboxylic acid, diphenyl ketone-dicarboxylic acid, naphthalenedicarboxylic acid such as 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, and 2,7-naphthalenedicarboxylic acid. Among these, terephthalic acid, isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, and 4,4'-biphenyldicarboxylic acid are preferred, with terephthalic acid being more preferred.

[0025] Examples of aliphatic diols include linear or branched aliphatic diols such as ethylene glycol, 2-butene-1,4-diol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, methylpentanediol, and diethylene glycol; and alicyclic diols such as cyclohexanedimethanol, isosorbide, spiroglycol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, norbornenedimethanol, and tricyclodecanedimethanol. Among these, ethylene glycol, neopentyl glycol, and cyclohexanedimethanol are preferred, with ethylene glycol being more preferred.

[0026] As the above-mentioned polyester, it is preferable to use a polyester in which 50 mol% or more of the dicarboxylic acid units are derived from terephthalic acid and 50 mol% or more of the diol units are derived from ethylene glycol, i.e., polyethylene terephthalate. If polyethylene terephthalate is used, the polyester is less likely to become amorphous, and transparency and light resistance will be good.

[0027] When polyethylene terephthalate is used as the polyester, the polyester may consist solely of polyethylene terephthalate, or it may contain other polyesters in addition to polyethylene terephthalate. In the present invention, the amount of polyethylene terephthalate in the total amount of polyester is preferably 80 to 100% by mass, and more preferably 90 to 100% by mass.

[0028] The polyethylene terephthalate described above is preferably composed solely of structural units derived from terephthalic acid and ethylene glycol, but may also contain structural units derived from bifunctional compounds other than terephthalic acid and ethylene glycol. Examples of the aforementioned bifunctional compounds include aromatic dicarboxylic acids and aliphatic diols other than terephthalic acid and ethylene glycol, as well as bifunctional compounds other than aromatic dicarboxylic acids and aliphatic diols.

[0029] Examples of the aforementioned difunctional compounds include linear or branched aliphatic difunctional compounds, specifically aliphatic dicarboxylic acids such as malonic acid, succinic acid, adipic acid, azelaic acid, and sebacic acid; and aliphatic hydroxycarboxylic acids such as 10-hydroxyoctadecanoyl acid, lactic acid, α-hydroxyacrylic acid, 2-hydroxy-2-methylpropionic acid, and hydroxybutyl acid. Other examples include alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, norbornenedicarboxylic acid, and tricyclodecanedicarboxylic acid; and alicyclic hydroxycarboxylic acids such as hydroxymethylcyclohexanecarboxylic acid, hydroxymethylnorbornenecarboxylic acid, and hydroxymethyltricyclodecanecarboxylic acid. Furthermore, examples include aromatic hydroxycarboxylic acids such as hydroxybenzoic acid, hydroxytoluic acid, hydroxynaphthic acid, 3-(hydroxyphenyl)propionic acid, hydroxyphenylacetic acid, and 3-hydroxy-3-phenylpropionic acid; as well as aromatic diols such as bisphenol compounds and hydroquinone compounds. The constituent units derived from the bifunctional compound are preferably 20 mol% or less, and more preferably 10 mol% or less, relative to the total moles of all constituent units that make up the polyester.

[0030] When the polyethylene terephthalate described above contains constituent units derived from aromatic dicarboxylic acids other than terephthalic acid, the aromatic dicarboxylic acid is preferably one or more selected from isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, and 4,4'-biphenyldicarboxylic acid. These are low-cost, and copolymer polyesters containing one of these are easy to manufacture. When polyethylene terephthalate contains constituent units derived from these aromatic dicarboxylic acids, the proportion of the aromatic dicarboxylic acid-derived components is preferably 1 to 20 mol%, and more preferably 1 to 10 mol%, of the dicarboxylic acid units. The intrinsic viscosity of the polyester used in the present invention is not particularly limited, but from the viewpoint of film-forming properties and productivity, it is preferably 0.45 to 1.0 dl / g, and more preferably 0.5 to 0.9 dl / g.

[0031] The amount of polyester in the polyester film of the present invention is preferably 90% by mass or more, and more preferably 95% by mass or more. When the amount of polyester is above the lower limit, the transparency of the polyester film can be ensured.

[0032] As described above, the polyester film of the present invention is preferably made by laminating polyester layers, and more preferably has a polyester layer (A) and a polyester layer (B) on at least one surface of the polyester layer (A), as shown below.

[0033] <<Polyester layer (A)>> <Halogen-free blue dye> The polyester film of the present invention preferably contains a halogen-free blue dye in the polyester layer (A). In the present invention, since a halogen-free blue dye is used, the adverse environmental impact when disposing of the polyester film can be reduced. Furthermore, in this invention, since a halogen-free blue dye and a pigment described later are used in combination in the polyester layer (A), excellent lightfastness of the polyester layer (A) can be obtained while suppressing haze in the polyester film. The halogen-free blue dye does not adversely affect the transparency of the polyester film. The reason why using halogen-free blue dyes and pigments in combination improves lightfastness is not entirely clear, but it is speculated that the halogen-free blue dyes and pigments have excellent compatibility, and because they are located in close proximity within the polyester layer (A), even at low concentrations of pigment, the amount of light irradiated to the halogen-free blue dye can be suppressed while suppressing haze in the polyester film, thereby effectively resulting in improved lightfastness.

[0034] Examples of halogen-free blue dyes include anthraquinone-based, azo-based, and phthalocyanine-based blue dyes. However, from the viewpoint of dyeability and fastness, halogen-free anthraquinone-based blue dyes are preferred.

[0035] There are no particular limitations on the halogen-free anthraquinone-based blue dye used in the present invention, but examples include compounds represented by the following general formula (I).

[0036] [ka] (In the formula, R 1 and R 4 Each of these independently represents a substituted or unsubstituted amino group, R 2 , R 3 , R 5 ~R 8 Each is independently a hydrogen atom or a substituent, R 2 and R 3 They may be bonded to each other, forming a ring.

[0037] R 1 and R 4Each of these independently represents a substituted or unsubstituted amino group. Substituents for substituted amino groups include substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, such as methyl, ethyl, propyl, butyl, octyl, 2-ethylhexyl, dodecyl, 2-hydroxyethyl, 2-methoxyethyl, 2-(2-methoxyethoxy)ethyl, benzyl, 2-phenethyl, and tetrahydrofurfuryl; alkenyl groups having 2 to 20 carbon atoms, such as vinyl, allyl, propenyl, butenyl, and pentenyl; and cyclopentyl and cyclo Cycloalkyl groups such as hexyl groups; substituted or unsubstituted aryl groups having linear or branched alkyl groups with 1 to 10 carbon atoms as substituents, linear or branched alkoxy groups with 1 to 10 carbon atoms, substituted alkyl groups such as hydroxyethyl groups and methoxyethyl groups, specifically phenyl groups, m-methylphenyl groups, p-methoxyphenyl groups, 2,4,6-trimethylphenyl groups, 2,6-diethyl-4-methylphenyl groups, p-cyanophenyl groups, p-carboxyphenyl groups, p-hydroxyphenyl groups, Substituted or unsubstituted aryl groups such as p-mercaptophenyl, p-(N,N-dimethylamino)phenyl, p-nitrophenyl, p-acetylphenyl, and 1-naphthyl; substituted or unsubstituted heterocyclic groups such as pyridyl, quinolyl, furyl, pyranyl, pyrrolyl, imidazolyl, oxazolyl, pyrazolyl, thienyl, thiazolyl, isothiazolyl, isoxazolyl, pyrimidyl, triazinyl, benzothiazolyl, and benzoxazolyl; formyl, acetyl, propionyl Substituted or unsubstituted acyl groups having 1 to 20 carbon atoms, such as yl group, butyryl group, octanoyl group, benzoyl group, p-methylbenzoyl group, 1-naphthoyl group, and thienoyl group; Substituted or unsubstituted alkylsulfonyl groups having 1 to 20 carbon atoms, such as methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, butylsulfonyl group, and 2-methoxyethylsulfonyl group; Substituted or unsubstituted arylsulfonyl groups having 1 to 20 carbon atoms, such as phenylsulfonyl group, p-methylphenylsulfonyl group, p-methoxyphenylsulfonyl group, and 1-naphthylsulfonyl group;Examples include substituted or unsubstituted alkoxycarbonyl groups such as methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, butoxycarbonyl, and benzyloxycarbonyl groups; substituted or unsubstituted aryloxycarbonyl groups such as phenyloxycarbonyl, p-methylphenyloxycarbonyl, and 1-naphthyloxycarbonyl groups; and cycloalkyloxycarbonyl groups such as cyclohexyloxycarbonyl and cyclopentyloxycarbonyl groups. A substituted amino group may have one or two of these substituents. Furthermore, the nitrogen atom of the amino group and the two substituents may form a five-membered or six-membered ring. Examples of such rings include morpholine rings, thiomorpholine rings, piperidine rings, piperazine rings, and rings represented by structures (II-a) to (II-d) below. These rings may also have substituents.

[0038] [ka] (In the above structures (II-a) to (II-d), * indicates the bonding portion with the anthraquinone skeleton.)

[0039] R 2 , R 3 , R 5 ~R 8Each of these independently represents a hydrogen atom or a substituent, and the substituents are specifically: a nitro group, a hydroxyl group, a mercapto group, a carboxyl group, a cyano group, a thiocyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted cycloalkyloxy group, a substituted or unsubstituted alkenyloxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heterocyclic oxy group, a substituted or unsubstituted acyloxy group, a substituted or unsubstituted alkylsulfonyloxy group, a substituted or unsubstituted arylsulfonyloxy group, a substituted or unsubstituted alkoxycarbonyloxy group, a substituted or unsubstituted aryloxycarbonyloxy group, and a substituted or unsubstituted alco This represents a xycarbonyl group, a substituted or unsubstituted cycloalkyloxycarbonyl group, a substituted or unsubstituted alkenyloxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group, a substituted or unsubstituted heterocyclic oxycarbonyl group, a substituted or unsubstituted carbamoyl group, a substituted or unsubstituted sulfamoyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted alkylsulfonyl group, a substituted or unsubstituted arylsulfonyl group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted cycloalkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted heterocyclic thio group, a substituted or unsubstituted alkoxysulfonyl group, a substituted or unsubstituted cycloalkyloxysulfonyl group, a substituted or unsubstituted alkenyloxysulfonyl group, a substituted or unsubstituted aryloxysulfonyl group, or a substituted or unsubstituted heterocyclic oxysulfonyl group. 2 and R 3 They may be bonded to each other, forming a ring.

[0040] Examples of unsubstituted alkyl groups include linear or branched alkyl groups having 1 to 20 carbon atoms, specifically methyl, ethyl, i-propyl, n-propyl, i-butyl, n-butyl, pentyl, hexyl, 2-ethylhexyl, n-octyl, n-decyl, and n-dodecyl groups.

[0041] Substituting alkyl groups include hydroxyl group-substituted alkyl groups such as 2-hydroxyethyl group and 3-hydroxyethyl group; carboxyl group-substituted alkyl groups such as carboxymethyl group and 2-carboxyethyl group; cyano group-substituted alkyl groups such as 2-cyanoethyl group; substituted or unsubstituted amino group-substituted alkyl groups such as 2-aminoethyl group, 2-(N-methylamino)ethyl group, and 2-(N,N-dimethylamino)ethyl group; substituted or unsubstituted carbamoyl group-substituted alkyl groups such as carbamoylmethyl group and N,N-dimethylcarbamoylethyl group; substituted or unsubstituted aryl group-substituted alkyl groups such as 2-phenylethyl group and 2-(p-methylphenyl)ethyl group; substituted or unsubstituted alkoxy group-substituted alkyl groups such as 2-methoxyethyl group and 3-methoxypropyl group; substituted or unsubstituted aryloxy group-substituted alkyl groups such as 2-phenoxyethyl group and 2-(p-methylphenoxy)ethyl group; substituted or unsubstituted acyloxy group-substituted alkyl groups such as 2-acetoxyethyl group; and cycloalkyl groups such as cyclohexyloxymethyl group. Examples include xyloid-substituted alkyl groups; alkylthio-substituted alkyl groups such as 2-methylthioethyl group and 3-ethylthiopropyl group; substituted or unsubstituted arylthio-substituted alkyl groups such as phenylthiomethyl group and 2-(p-methylphenylthio)ethyl group; cycloalkylthio-substituted alkyl groups such as cyclohexylthiomethyl group; heterocyclic thio-substituted alkyl groups such as 2-(2-mercaptobenzothiazolyl)ethyl group; substituted or unsubstituted alkoxycarbonyl-substituted alkyl groups such as methoxycarbonylmethyl group, 2-ethoxycarbonylethyl group, and 2-(2-methoxyethoxy)carbonylethyl group; substituted or unsubstituted aryloxycarbonyl-substituted alkyl groups such as 2-phenoxycarbonylethyl group and 2-(p-methoxyphenoxy)carbonylethyl group; cycloalkyloxycarbonyl-substituted alkyl groups such as 2-cyclohexyloxycarbonylethyl group; carboxyl-substituted alkyl groups such as 2-carboxyethyl group; and mercapto-substituted alkyl groups such as 2-mercaptoethyl group.

[0042] Examples of substituted or unsubstituted cycloalkyl groups include those with 4 to 7 carbon atoms, such as cyclopentyl, cyclohexyl, and cycloheptyl groups. Examples of substituted or unsubstituted alkenyl groups include linear or branched groups having 2 to 10 carbon atoms, such as vinyl groups, allyl groups, propenyl groups, butenyl groups, and pentenyl groups.

[0043] Examples of substituted or unsubstituted aryl groups include phenyl groups and naphthyl groups, and their substituents include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl groups and methoxyethyl groups.

[0044] Examples of substituted or unsubstituted heterocyclic groups include pyridyl, quinolyl, furyl, pyranyl, pyrrolyl, imidazolyl, oxazolyl, pyrazolyl, thienyl, thiazolyl, isothiazolyl, isoxazolyl, pyrimidyl, triazinyl, benzothiazolyl, and benzoxazolyl groups. Substituents for these groups include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl and methoxyethyl groups.

[0045] Substituents for substituted amino groups include substituted or unsubstituted C1-C20 alkyl groups such as methyl, ethyl, propyl, butyl, octyl, 2-ethylhexyl, dodecyl, 2-hydroxyethyl, 2-methoxyethyl, 2-(2-methoxyethoxy)ethyl, benzyl, 2-phenethyl, and tetrahydrofurfuryl; C2-C20 alkenyl groups such as vinyl, allyl, propenyl, butenyl, and pentenyl; cycloalkyl groups such as cyclopentyl and cyclohexyl; and substituted or unsubstituted aryl groups with carbon as a substituent. Groups having 1 to 10 linear or branched alkyl groups, 1 to 10 linear or branched alkoxy groups, hydroxyethyl groups, methoxyethyl groups, and other substituted alkyl groups, specifically phenyl groups, m-methylphenyl groups, p-methoxyphenyl groups, 2,4,6-trimethylphenyl groups, 2,6-diethyl-4-methylphenyl groups, p-cyanophenyl groups, p-carboxyphenyl groups, p-hydroxyphenyl groups, p-mercaptophenyl groups, p-(N,N-dimethylamino)phenyl groups, p-nitrophenyl groups, p-acetylphenyl groups, etc. Substituted or unsubstituted aryl groups such as phenyl group, 1-naphthyl group; substituted or unsubstituted heterocyclic groups such as pyridyl group, quinolyl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, oxazolyl group, pyrazolyl group, thienyl group, thiazolyl group, isothiazolyl group, isoxazolyl group, pyrimidyl group, triazinyl group, benzothiazolyl group, benzoxazolyl group; substituted or unsubstituted C1-C20 groups such as formyl group, acetyl group, propionyl group, butyryl group, octanoyl group, benzoyl group, p-methylbenzoyl group, 1-naphthoyl group, thienol group, etc. Substituted acyl groups; substituted or unsubstituted alkylsulfonyl groups having 1 to 20 carbon atoms, such as methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, butylsulfonyl group, and 2-methoxyethylsulfonyl group; substituted or unsubstituted arylsulfonyl groups, such as phenylsulfonyl group, p-methylphenylsulfonyl group, p-methoxyphenylsulfonyl group, and 1-naphthylsulfonyl group; substituted or unsubstituted alkoxycarbonyl groups, such as methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group, butoxycarbonyl group, and benzyloxycarbonyl group;Examples include substituted or unsubstituted aryloxycarbonyl groups such as phenyloxycarbonyl groups, p-methylphenyloxycarbonyl groups, and 1-naphthyloxycarbonyl groups; and cycloalkyloxycarbonyl groups such as cyclohexyloxycarbonyl groups and cyclopentyloxycarbonyl groups. A substituted amino group may have one or two of these substituents. Furthermore, the nitrogen atom of the amino group and the two substituents may form a five-membered or six-membered ring. Examples of such rings include morpholine rings, thiomorpholine rings, piperidine rings, piperazine rings, and rings represented by structures (II-a) to (II-d) below. These rings may also have substituents.

[0046] [ka] (In the above structures (II-a) to (II-d), * indicates the bonding portion with the anthraquinone skeleton.)

[0047] Examples of substituted or unsubstituted alkoxy groups include, for unsubstituted alkoxy groups, linear or branched alkoxy groups having 1 to 20 carbon atoms, specifically methoxy, ethoxy, i-propoxy, n-propoxy, i-butoxy, n-butoxy, pentyloxy, hexyloxy, 2-ethylhexyloxy, n-octyloxy, n-decyloxy, and n-dodecyloxy groups, while for substituted alkoxy groups, the total number of carbon atoms in the substituted alkoxy group is 1 to 20. Preferably, hydroxy-substituted alkoxy groups such as 2-hydroxyethoxy group, 2-hydroxypropoxy group, 3-hydroxypropoxy group, 4-hydroxybutoxy group; phenyl-substituted alkoxy groups such as benzyloxy group, 2-phenylethoxy group; 2-methoxyethoxy group, 2-ethoxyethoxy group, 2-(n)propoxyethoxy group, 2-(iso)propoxyethoxy group, 3-methoxypropoxy group, 4-methoxybutoxy group, 3-methoxybutoxy group, 2,3-dimethoxyp Alkoxy-substituted alkoxy groups such as ropoxy group and 2,2-dimethoxyethoxy group; alkoxy-substituted alkoxy groups such as 2-(2-methoxyethoxy)ethoxy group, 2-(2-ethoxyethoxy)ethoxy group, 2-(2-(n)propoxyethoxy)ethoxy group, 2-(2-(n)butoxyethoxy)ethoxy group, and 2-{2-(2-ethylhexyloxy)ethoxy}ethoxy group; aralkyloxy-substituted alkoxy groups such as 2-phenethyloxyethoxy group and 2-benzyloxyethoxy group. Examples include lucoxy groups; acyloxy-substituted alkoxy groups such as 2-acetyloxyethoxy group and 2-propionyloxyethoxy group; alkoxycarbonyl-substituted alkoxy groups such as 2-methoxycarbonylethoxy group and 2-ethoxycarbonylethoxy group; heterocyclic-substituted alkoxy groups such as furfuryloxy group and tetrahydrofurfuryloxy group; alkenyloxy-substituted alkoxy groups such as 2-allyloxyethoxy group; and aryloxy-substituted alkoxy groups such as 2-phenoxyethoxy group.

[0048] Examples of substituted or unsubstituted cycloalkyloxy groups include those with 4 to 7 carbon atoms, such as cyclopentyloxy, cyclohexyloxy, and cycloheptyloxy groups. Examples of substituted or unsubstituted alkenyloxy groups include linear or branched groups having 2 to 10 carbon atoms, such as vinyloxy groups, allyloxy groups, propenyloxy groups, butenyloxy groups, and pentenyloxy groups.

[0049] Examples of substituted or unsubstituted aryloxy groups include phenoxy and naphthoxy groups, and their substituents include nitro, hydroxyl, mercapto, carboxyl, cyano, thiocyano, linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl and methoxyethyl groups.

[0050] Examples of substituted or unsubstituted heterocyclic oxy groups include pyridyloxy, quinolyloxy, furyloxy, pyranyloxy, pyrrolyloxy, imidazolyloxy, oxazolyloxy, pyrazolyloxy, thienyloxy, thiazolyloxy, isothiazolyloxy, isoxazolyloxy, pyrimidyloxy, triazinyloxy, benzothiazolyloxy, and benzoxazolyloxy. Substituents for these include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl and methoxyethyl groups.

[0051] Examples of substituted or unsubstituted acyloxy groups include those with 1 to 20 carbon atoms, such as acetyloxy group, propionyloxy group, butyryloxy group, octanoyloxy group, benzoyloxy group, p-methylbenzoyloxy group, 1-naphthoyloxy group, and thienoyloxy group. Examples of substituted or unsubstituted alkylsulfonyloxy groups include methylsulfonyloxy, ethylsulfonyloxy, propylsulfonyloxy, butylsulfonyloxy, pentylsulfonyloxy, hexylsulfonyloxy, 2-ethylhexylsulfonyloxy, n-octylsulfonyloxy, n-decylsulfonyloxy, n-dodecylsulfonyloxy, and 2-methoxyethoxysulfonyloxy, which have 1 to 20 carbon atoms.

[0052] Examples of substituted or unsubstituted arylsulfonyloxy groups include phenylsulfonyloxy group, p-methylphenylsulfonyloxy group, p-methoxyphenylsulfonyloxy group, and 1-naphthylsulfonyloxy group. Examples of substituted or unsubstituted alkoxycarbonyloxy groups include those with 1 to 20 carbon atoms, such as methoxycarbonyloxy group, ethoxycarbonyloxy group, propoxycarbonyloxy group, butoxycarbonyloxy group, pentyloxycarbonyloxy group, hexyloxycarbonyloxy group, 2-ethylhexyloxycarbonyloxy group, n-octyloxycarbonyloxy group, n-decyloxycarbonyloxy group, n-dodecyloxycarbonyloxy group, and 2-methoxyethoxycarbonyloxy group.

[0053] Examples of substituted or unsubstituted aryloxycarbonyloxy groups include phenoxycarbonyloxy group, p-methylphenoxycarbonyloxy group, p-methoxyphenoxycarbonyloxy group, and 1-naphthoxycarbonyloxy group. As substituted or unsubstituted alkoxycarbonyl groups, unsubstituted alkoxycarbonyl groups include linear or branched alkoxycarbonyl groups having 1 to 20 carbon atoms, specifically methoxycarbonyl group, ethoxycarbonyl group, i-propoxycarbonyl group, n-propoxycarbonyl group, i-butoxycarbonyl group, n-butoxycarbonyl group, pentyloxycarbonyl group, hexyloxycarbonyl group, 2-ethylhexyloxycarbonyl group, n-octyloxycarbonyl group, n-decyloxycarbonyl group Examples include nyl groups and n-dodecyloxycarbonyl groups. The substituted alkoxycarbonyl groups are preferably those with 1 to 20 carbon atoms in total, such as hydroxysubstituted alkoxycarbonyl groups like 2-hydroxyethoxycarbonyl, 2-hydroxypropoxycarbonyl, 3-hydroxypropoxycarbonyl, and 4-hydroxybutoxycarbonyl; phenylsubstituted alkoxycarbonyl groups like benzyloxycarbonyl and 2-phenylethoxycarbonyl; and 2-methoxyethoxycarbonyl groups. Alkoxy-substituted alkoxycarbonyl groups such as 2-ethoxyethoxycarbonyl group, 2-(n)propoxyethoxycarbonyl group, 2-(iso)propoxyethoxycarbonyl group, 3-methoxypropoxycarbonyl group, 4-methoxybutoxycarbonyl group, 3-methoxybutoxycarbonyl group, 2,3-dimethoxypropoxycarbonyl group, 2,2-dimethoxyethoxycarbonyl group, etc.; 2-(2-methoxyethoxy)ethoxycarbonyl group, 2-(2-ethoxyethoxy)ethoxycarbonyl group, 2-(2-(n) Alkoxy-alkoxy substituted alkoxycarbonyl groups such as ropoxyethoxy)ethoxycarbonyl group, 2-(2-(n)butoxyethoxy)ethoxycarbonyl group, and 2-{2-(2-ethylhexyloxy)ethoxy}ethoxycarbonyl group; aralkyloxy substituted alkoxycarbonyl groups such as 2-phenethyloxyethoxycarbonyl group and 2-benzyloxyethoxycarbonyl group; acyloxy substituted alkoxycarbonyl groups such as 2-acetyloxyethoxycarbonyl group and 2-propionyloxyethoxycarbonyl group;Examples include alkoxycarbonyl-substituted alkoxycarbonyl groups such as 2-methoxycarbonylethoxycarbonyl group and 2-ethoxycarbonylethoxycarbonyl group; heterocyclic-substituted alkoxycarbonyl groups such as furfuryloxycarbonyl group and tetrahydrofurfuryloxycarbonyl group; alkenyloxy-substituted alkoxycarbonyl groups such as 2-allyloxyethoxycarbonyl group; and aryloxy-substituted alkoxycarbonyl groups such as 2-phenoxyethoxycarbonyl group.

[0054] Examples of substituted or unsubstituted cycloalkyloxycarbonyl groups include those with 4 to 7 carbon atoms, such as cyclopentyloxycarbonyl group, cyclohexyloxycarbonyl group, and cycloheptyloxycarbonyl group. Examples of substituted or unsubstituted alkenyloxycarbonyl groups include linear or branched groups having 2 to 10 carbon atoms, such as vinyloxycarbonyl group, allyloxycarbonyl group, propenyloxycarbonyl group, butenyloxycarbonyl group, and pentenyloxycarbonyl group.

[0055] Examples of substituted or unsubstituted aryloxycarbonyl groups include phenoxycarbonyl groups and naphthoxycarbonyl groups, and their substituents include nitro groups, hydroxyl groups, mercapto groups, carboxyl groups, cyano groups, thiocyano groups, linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl groups and methoxyethyl groups.

[0056] Examples of substituted or unsubstituted heterocyclic oxycarbonyl groups include pyridyloxycarbonyl group, quinolyloxycarbonyl group, furyloxycarbonyl group, pyranyloxycarbonyl group, pyrrolyloxycarbonyl group, imidazolyloxycarbonyl group, oxazolyloxycarbonyl group, pyrazolyloxycarbonyl group, thienyloxycarbonyl group, thiazolyloxycarbonyl group, isothiazolyloxycarbonyl group, isoxazolyloxycarbonyl group, pyrimidyloxycarbonyl group, triazinyloxycarbonyl group, benzothiazolyloxycarbonyl group, and benzoxazolyloxycarbonyl group. Substituents for these groups include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl and methoxyethyl groups.

[0057] Substituents for substituted carbamoyl groups include substituted or unsubstituted alkyl groups with 1 to 20 carbon atoms such as methyl, ethyl, propyl, butyl, octyl, 2-ethylhexyl, dodecyl, 2-hydroxyethyl, 2-methoxyethyl, 2-(2-methoxyethoxy)ethyl, benzyl, 2-phenethyl, and tetrahydrofurfuryl; alkenyl groups with 2 to 20 carbon atoms such as vinyl, allyl, propenyl, butenyl, and pentenyl; cycloalkyl groups such as cyclopentyl and cyclohexyl; and substituted or unsubstituted ali groups. A group having a substituent such as a linear or branched alkyl group having 1 to 10 carbon atoms, a linear or branched alkoxy group having 1 to 10 carbon atoms, a substituted alkyl group such as a hydroxyethyl group or a methoxyethyl group, specifically a phenyl group, m-methylphenyl group, p-methoxyphenyl group, p-cyanophenyl group, p-carboxyphenyl group, p-hydroxyphenyl group, p-mercaptophenyl group, p-(N,N-dimethylamino)phenyl group, p-nitrophenyl group, p-acetylphenyl group, 1-naphthyl group, etc. Unsubstituted aryl groups; substituted or unsubstituted heterocyclic groups such as pyridyl, quinolyl, furyl, pyranyl, pyrrolyl, imidazolyl, oxazolyl, pyrazolyl, thienyl, thiazolyl, isothiazolyl, isoxazolyl, pyrimidyl, triazinyl, benzothiazolyl, and benzoxazolyl groups; substituted or unsubstituted acyl groups with 1 to 20 carbon atoms such as formyl, acetyl, propionyl, butyryl, octanoyl, benzoyl, p-methylbenzoyl, 1-naphthoyl, and thienol groups; Substituted or unsubstituted alkylsulfonyl groups having 1 to 20 carbon atoms, such as ethylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, butylsulfonyl group, and 2-methoxyethylsulfonyl group; Substituted or unsubstituted arylsulfonyl groups, such as phenylsulfonyl group, p-methylphenylsulfonyl group, p-methoxyphenylsulfonyl group, and 1-naphthylsulfonyl group; Substituted or unsubstituted alkoxycarbonyl groups, such as methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group, butoxycarbonyl group, and benzyloxycarbonyl group;Substituted or unsubstituted aryloxycarbonyl groups such as phenyloxycarbonyl groups, p-methylphenyloxycarbonyl groups, and 1-naphthyloxycarbonyl groups; and cycloalkyloxycarbonyl groups such as cyclohexyloxycarbonyl groups and cyclopentyloxycarbonyl groups. A substituted carbamoyl group may have one or two of these substituents. Furthermore, the nitrogen atom of the carbamoyl group and the two substituents may form a five-membered or six-membered ring. Examples of such rings include morpholine rings, thiomorpholine rings, piperidine rings, piperazine rings, and rings represented by structures (II-a) to (II-d) below; these rings may also have substituents.

[0058] [ka]

[0059] Substituents for substituted sulfamoyl groups include substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms such as methyl, ethyl, propyl, butyl, octyl, 2-ethylhexyl, dodecyl, 2-hydroxyethyl, 2-methoxyethyl, 2-(2-methoxyethoxy)ethyl, benzyl, 2-phenethyl, and tetrahydrofurfuryl; alkenyl groups having 2 to 20 carbon atoms such as vinyl, allyl, propenyl, butenyl, and pentenyl; cycloalkyl groups such as cyclopentyl and cyclohexyl; and substituted or unsubstituted A The reel group has substituents such as linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, hydroxyethyl groups, methoxyethyl groups, and other substituted alkyl groups, specifically phenyl groups, m-methylphenyl groups, p-methoxyphenyl groups, p-cyanophenyl groups, p-carboxyphenyl groups, p-hydroxyphenyl groups, p-mercaptophenyl groups, p-(N,N-dimethylamino)phenyl groups, p-nitrophenyl groups, p-acetylphenyl groups, 1-naphthyl groups, and other substituted groups. or unsubstituted aryl groups; substituted or unsubstituted heterocyclic groups such as pyridyl, quinolyl, furyl, pyranyl, pyrrolyl, imidazolyl, oxazolyl, pyrazolyl, thienyl, thiazolyl, isothiazolyl, isoxazolyl, pyrimidyl, triazinyl, benzothiazolyl, and benzoxazolyl groups; substituted or unsubstituted acyl groups with 1 to 20 carbon atoms such as formyl, acetyl, propionyl, butyryl, octanoyl, benzoyl, p-methylbenzoyl, 1-naphthoyl, and thienol groups; Substituted or unsubstituted alkylsulfonyl groups having 1 to 20 carbon atoms, such as ethylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, butylsulfonyl group, and 2-methoxyethylsulfonyl group; Substituted or unsubstituted arylsulfonyl groups, such as phenylsulfonyl group, p-methylphenylsulfonyl group, p-methoxyphenylsulfonyl group, and 1-naphthylsulfonyl group; Substituted or unsubstituted alkoxycarbonyl groups, such as methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group, butoxycarbonyl group, and benzyloxycarbonyl group;Examples of substituted or unsubstituted aryloxycarbonyl groups include phenyloxycarbonyl groups, p-methylphenyloxycarbonyl groups, and 1-naphthyloxycarbonyl groups; and cycloalkyloxycarbonyl groups such as cyclohexyloxycarbonyl groups and cyclopentyloxycarbonyl groups. A substituted sulfamoyl group may have one or two of these substituents. Furthermore, the nitrogen atom of the sulfamoyl group and the two substituents may form a five-membered or six-membered ring. Examples of such rings include morpholine rings, thiomorpholine rings, piperidine rings, piperazine rings, and rings represented by structures (II-a) to (II-d) below; these rings may also have substituents.

[0060] [ka]

[0061] Examples of substituted or unsubstituted acyl groups include substituted or unsubstituted acyl groups having 1 to 20 carbon atoms, such as formyl group, acetyl group, propionyl group, butyryl group, octanoyl group, benzoyl group, p-methylbenzoyl group, 1-naphthoyl group, and thienoyl group.

[0062] Examples of substituted or unsubstituted alkylsulfonyl groups include linear or branched alkylsulfonyl groups having 1 to 20 carbon atoms, specifically methylsulfonyl group, ethylsulfonyl group, i-propylsulfonyl group, n-propylsulfonyl group, i-butylsulfonyl group, n-butylsulfonyl group, pentylsulfonyl group, hexylsulfonyl group, 2-ethylhexylsulfonyl group, n-octylsulfonyl group, n-decylsulfonyl group, n-dodecylsulfonyl group, etc., which may have substituents such as hydroxyl groups or alkoxy groups.

[0063] Examples of substituted or unsubstituted arylsulfonyl groups include phenylsulfonyl groups and naphthylsulfonyl groups, and their substituents include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl groups and methoxyethyl groups.

[0064] Examples of substituted or unsubstituted alkylthio groups include linear or branched alkylthio groups having 1 to 20 carbon atoms, specifically methylthio group, ethylthio group, i-propylthio group, n-propylthio group, i-butylthio group, n-butylthio group, pentylthio group, hexylthio group, 2-ethylhexylthio group, n-octylthio group, n-decylthio group, n-dodecylthio group, etc., which may have substituents such as hydroxyl groups and alkoxy groups.

[0065] Examples of substituted or unsubstituted cycloalkylthio groups include those with 4 to 7 carbon atoms, such as cyclopentylthio, cyclohexylthio, and cycloheptylthio groups. Examples of substituted or unsubstituted arylthio groups include phenylthio groups and naphthylthio groups, and their substituents include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl groups and methoxyethyl groups.

[0066] Examples of substituted or unsubstituted heterocyclic thio groups include pyridylthio, quinolylthio, furylthio, pyranylthio, pyrlorylthio, imidazolylthio, oxazolylthio, pyrazolylthio, thienylthio, thiazolylthio, isothiazolylthio, isoxazolylthio, pyrimidylthio, triazinylthio, benzothiazolylthio, and benzoxazolylthio. Substituents for these include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl and methoxyethyl groups.

[0067] As substituted or unsubstituted alkoxysulfonyl groups, unsubstituted alkoxysulfonyl groups include linear or branched alkoxysulfonyl groups having 1 to 20 carbon atoms, specifically methoxysulfonyl group, ethoxysulfonyl group, i-propoxysulfonyl group, n-propoxysulfonyl group, i-butoxysulfonyl group, n-butoxysulfonyl group, pentyloxysulfonyl group, hexyloxysulfonyl group, 2-ethylhexyloxysulfonyl group, n-octyloxysulfonyl group, and n-decyloxysulfonyl group. Examples include nyl groups and n-dodecyloxysulfonyl groups. The substituted alkoxysulfonyl groups preferably have 1 to 20 carbon atoms in total, including hydroxysubstituted alkoxysulfonyl groups such as 2-hydroxyethoxysulfonyl, 2-hydroxypropoxysulfonyl, 3-hydroxypropoxysulfonyl, and 4-hydroxybutoxysulfonyl groups; phenylsubstituted alkoxysulfonyl groups such as benzyloxysulfonyl and 2-phenylethoxysulfonyl groups; and 2-methoxyethoxysulfonyl groups. Alkoxy-substituted alkoxysulfonyl groups such as 2-ethoxyethoxysulfonyl group, 2-(n)propoxyethoxysulfonyl group, 2-(iso)propoxyethoxysulfonyl group, 3-methoxypropoxysulfonyl group, 4-methoxybutoxysulfonyl group, 3-methoxybutoxysulfonyl group, 2,3-dimethoxypropoxysulfonyl group, 2,2-dimethoxyethoxysulfonyl group, etc.; 2-(2-methoxyethoxy)ethoxysulfonyl group, 2-(2-ethoxyethoxy)ethoxysulfonyl group, 2-(2-(n)propoxysulfonyl group, etc. Alkoxyalkoxy-substituted alkoxysulfonyl groups such as ropoxyethoxy)ethoxysulfonyl group, 2-(2-(n)butoxyethoxy)ethoxysulfonyl group, and 2-{2-(2-ethylhexyloxy)ethoxy}ethoxysulfonyl group; aralkyloxy-substituted alkoxysulfonyl groups such as 2-phenethyloxyethoxysulfonyl group and 2-benzyloxyethoxysulfonyl group; acyloxy-substituted alkoxysulfonyl groups such as 2-acetyloxyethoxysulfonyl group and 2-propionyloxyethoxysulfonyl group;Examples include alkoxycarbonyl-substituted alkoxysulfonyl groups such as 2-methoxycarbonylethoxysulfonyl group and 2-ethoxycarbonylethoxysulfonyl group; heterocyclic-substituted alkoxysulfonyl groups such as furfuryloxysulfonyl group and tetrahydrofurfuryloxysulfonyl group; alkenyloxy-substituted alkoxysulfonyl groups such as 2-allyloxyethoxysulfonyl group; and aryloxy-substituted alkoxysulfonyl groups such as 2-phenoxyethoxysulfonyl group.

[0068] Examples of substituted or unsubstituted cycloalkyloxysulfonyl groups include those with 4 to 7 carbon atoms, such as cyclopentyloxysulfonyl group, cyclohexyloxysulfonyl group, and cycloheptyloxysulfonyl group. Examples of substituted or unsubstituted alkenyloxysulfonyl groups include linear or branched groups having 2 to 10 carbon atoms, such as vinyloxysulfonyl group, allyloxysulfonyl group, propenyloxysulfonyl group, butenyloxysulfonyl group, and pentenyloxysulfonyl group.

[0069] Examples of substituted or unsubstituted aryloxysulfonyl groups include phenoxysulfonyl groups and naphthoxysulfonyl groups, and their substituents include nitro groups, hydroxyl groups, mercapto groups, carboxyl groups, cyano groups, thiocyano groups, linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl groups and methoxyethyl groups.

[0070] Examples of substituted or unsubstituted heterocyclic oxysulfonyl groups include pyridyloxysulfonyl group, quinolyloxysulfonyl group, furyloxysulfonyl group, pyranyloxysulfonyl group, pyrloryloxysulfonyl group, imidazolyloxysulfonyl group, oxazolyloxysulfonyl group, pyrazolyloxysulfonyl group, thienyloxysulfonyl group, thiazolyloxysulfonyl group, isothiazolyloxysulfonyl group, isoxazolyloxysulfonyl group, pyrimidyloxysulfonyl group, triazinyloxysulfonyl group, benzothiazolyloxysulfonyl group, and benzoxazolyloxysulfonyl group. Substituents for these groups include linear or branched alkyl groups having 1 to 10 carbon atoms, linear or branched alkoxy groups having 1 to 10 carbon atoms, and substituted alkyl groups such as hydroxyethyl and methoxyethyl groups.

[0071] R 2 , R 3 , R 5 ~R 8 Each represents a hydrogen atom, or R 5 ~R 8 Each represents a hydrogen atom, and R 2 and R 3 These are substituents, and it is preferable that they are bonded to each other to form a ring. Specific examples of substituents are as described above. Also, R 2 and R 3 Examples of compounds in which elements bond to each other to form a ring include those with a structure represented by the following general formula (III).

[0072] [ka] (In the formula, X 1 and X 4 ~X 8 These are R in equation (I), respectively. 1 and R 4 ~R 8 It is synonymous with X 9 and X 10 X represents an oxygen atom, a sulfur atom, or NH, 11(This represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.)

[0073] X in equation (III) 11 For substituted or unsubstituted alkyl groups, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted alkyl groups, and substituted or unsubstituted aryl groups in R 1 ~R 8 As explained in [reference], examples of substituted or unsubstituted aralkyl groups include aralkyl groups having 7 to 20 carbon atoms. Groups that may be substituted for aralkyl groups include alkyl groups having 1 to 15 carbon atoms, alkoxy groups having 1 to 15 carbon atoms, hydroxyl groups, amino groups, dimethylamino groups, diethylamino groups, halogen atoms, sulfo groups, and carboxyl groups. Specific examples of aralkyl groups include benzyl groups, phenethyl groups, α-methylbenzyl groups, α-methylphenylethyl groups, β-methylphenylethyl groups, and fluorenyl groups.

[0074] Furthermore, among the compounds represented by the above general formula (III), the compound represented by the following general formula (III-a) is preferred. [ka] (In the formula, X 11 (As stated above.)

[0075] X 11 The carbon atoms preferably have 1 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and even more preferably 2 to 6 carbon atoms. In particular, X 11 It is preferably a C2-C6 alkyl group, and is either substituted or unsubstituted, and from the viewpoint of robustness, X 11 It is more preferable that the group is an alkoxy-substituted alkyl group such as a 2-methoxyethyl group or a 3-methoxypropyl group.

[0076] The halogen-free anthraquinone-based blue dye used in the present invention may also be a compound represented by the following general formula (IV).

[0077] [ka] (In the formula, X 21 ~X 24 Each of these independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.

[0078] X in general formula (IV) 21 ~X 24 For substituted or unsubstituted alkyl groups, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted alkyl groups, and substituted or unsubstituted aryl groups in R 1 ~R 8 As explained above, the substituted or unsubstituted aralkyl group is X 11 As explained in [the previous section]. In the above general formula (IV), X 21 ~X 24 In the case of atoms other than hydrogen atoms, each atom preferably has 1 to 20 carbon atoms, more preferably 6 to 15, and even more preferably 8 to 14 carbon atoms. Among the compounds represented by the general formula (IV) above, X 21 and X 23 Compounds represented by the following general formula (IV-a), in which is a hydrogen atom, are preferred, and among them, X 22 and X 24 Compounds selected from a phenyl group and a substituted or unsubstituted aryl group are more preferably X 22 and X 24 It is even more preferable that each is selected from a 2,4,6-trimethylphenyl group and a 2,6-diethyl-4-methylphenyl group.

[0079] [ka] (In the formula, X 22 and X 24 These are as described above.

[0080] Furthermore, the halogen-free anthraquinone-based blue dye used in the present invention is also preferably a compound represented by the following general formula (V).

[0081] [ka] (In the formula, X 27 , X 28 Each of these independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group. 1 and Y 2 (Either one is a hydroxyl group and the other is a nitro group (-NO2) or an amino group (-NH2), or both are hydrogen atoms.)

[0082] X in general formula (V) 27 , X 28 For substituted or unsubstituted alkyl groups, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted alkyl groups, and substituted or unsubstituted aryl groups in R 1 ~R 8 As explained above, the substituted or unsubstituted aralkyl group is X 11 As explained in [the previous section]. X 27 and X 28 In the case of atoms other than hydrogen atoms, each atom preferably has 1 to 20 carbon atoms, more preferably 4 to 15, and even more preferably 6 to 14 carbon atoms.

[0083] Among the compounds represented by the above general formula (V), compounds represented by the following general formulas (Va) to (Vc) are more preferred. [ka] (In the formula, X31 ~X 34 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.)

[0084] X in General Formulas (V-a) to (V-c) 31 ~X 34 For the substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted alkoxy group, and substituted or unsubstituted aryl group in ~X in 34 , it is as described for R 2 、R 3 、R 5 ~R 8 and the substituted or unsubstituted aralkyl group is as described for X 11 in 11 . In the above General Formulas (V-a) to (V-c), when X 31 ~X 34 is other than a hydrogen atom, the number of carbon atoms is preferably 1 to 20, more preferably 4 to 15, and even more preferably 6 to 14. Among the compounds represented by the above General Formulas (V-a) to (V-c), from the viewpoint of improving light resistance, in the compound represented by General Formula (V-a), compounds where X 31 is a 4-(2-ethoxyethoxy)phenyl group and X 32 is a hydrogen atom, compounds where X 31 is a 4-hydroxyphenoxy group and X 32 is a hydrogen atom, or compounds where X 31 is a 4-methoxyphenoxy group and X 32 is a hydrogen atom are preferred. Also, in the compound represented by General Formula (V-b), compounds where X 33 is a 2-hydroxyethylphenyl group and compounds where X 33 is a phenyl group are also preferred. Further, in the compound represented by General Formula (V-c), compounds where X 34 is a phenyl group are also preferred. However, in the present invention, as halogen-free anthraquinone-based blue dyes, compounds other than those represented by General Formulas (I) and (V) can also be used.

[0085] Specific examples of halogen-free anthraquinone-based blue dyes include Disperse Blue 3, Disperse Blue 5, Disperse Blue 14, Disperse Blue 26, Disperse Blue 28, Disperse Blue 35, Disperse Blue 334, Disperse Blue 359, Disperse Blue 60, Disperse Blue 72, Disperse Blue 73, Disperse Blue 77, Disperse Blue 214, Disperse Blue 167, Disperse Blue 54, Solvent Blue 101, Solvent Blue 102, Solvent Blue 104, Solvent Blue 122, Solvent Blue 35, Solvent Blue 36, Solvent Blue 59, Solvent Blue 63, Solvent Blue 68, Solvent Blue 78, and Solvent Blue 97. Among these, preferred compounds include Disperse Blue 60, a dye containing the compound represented by the general formula (III-a) described above. Also, Solvent Blue 104 and Solvent Blue 97 are dyes containing the compound represented by the general formula (IV) described above. Furthermore, Disperse Blue 214, Disperse Blue 167, and Disperse Blue 54 are dyes containing the compound represented by the general formula (V) described above. The dyes mentioned above may be used individually or in combination of two or more.

[0086] The content of halogen-free blue dye in the polyester layer (A) is preferably 0.01 to 2% by mass, more preferably 0.02 to 1.5% by mass, and even more preferably 0.05 to 1% by mass. If the content of halogen-free blue dye is above the lower limit, the polyester film can be sufficiently given aesthetic appeal. On the other hand, if the content of halogen-free blue dye is below the upper limit, the haze of the polyester film can be kept low.

[0087] The content of halogen-free blue dye in the polyester film is preferably 0.01 to 2% by mass, more preferably 0.02 to 1.5% by mass, and even more preferably 0.05 to 1% by mass.

[0088] <Other colorants> In the present invention, colorants other than the halogen-free blue dye mentioned above may be used, as are other halogen-free colorants. Preferred other colorants are those that dissolve in polyester and decompose little at the polyester molding temperature. Chemically, such colorants are preferably perinone-based, perylene-based, azomethine-based, or heterocyclic dyes. These dyes can be appropriately selected and mixed in several types to achieve, for example, smoky or brown tones. The content of other colorants in the polyester film is usually preferably 0.01 to 5% by mass, and more preferably 0.05 to 2% by mass.

[0089] <Pigments> In the present invention, if the polyester layer (A) contains the above-mentioned halogen-free blue dye, it is preferable to also contain a pigment along with the dye. In the present invention, the use of a pigment makes it possible to impart light-shielding properties to the polyester film. Furthermore, by using a pigment in combination with the above-mentioned halogen-free blue dye, the haze of the polyester film can be kept low, and the light resistance of the polyester film is also improved. As for the pigments used in the polyester layer (A), black pigments and white pigments with high opacity are preferred from the viewpoint of light-shielding properties of the polyester film. In particular, by using black pigments with high opacity, the light-shielding properties of the polyester film can be improved even with a small amount, and if a small amount is used, the haze of the polyester film can be kept low.

[0090] Examples of pigments include organic pigments and inorganic pigments, but from the viewpoint of light-shielding properties and stability, carbon-based black pigments such as carbon black and carbon nanotubes are preferred, with carbon black being more preferred.

[0091] Carbon blacks that can be used in the present invention include furnace black, channel black, acetylene black, and the like. The average primary particle size of the carbon black used in the present invention is preferably 5 to 100 nm, more preferably 10 to 50 nm, and even more preferably 15 to 40 nm. If the average primary particle size of carbon black is below the upper limit, the haze of the film can be kept low, improving the transparency of the film. On the other hand, carbon black particles can exist as aggregates formed by the aggregation of fine primary particles. When these aggregates are present in polyester and subjected to biaxial stretching, the stretching stress applied to the film also acts on these aggregates, causing them to disperse. If the average primary particle size is above the lower limit, the cohesive force between these primary particles does not become too strong, and the stretching stress applied when stretching the film makes it easier for the aggregates to disperse. In this invention, the average primary particle diameter is the particle diameter measured by observing carbon black particles, either individually or in polyester, using an electron microscope. If the particles exist as aggregates, it refers to the particle diameter of the primary particles constituting these aggregates. For example, it can be measured by directly measuring the size of primary particles from electron microscope images using a transmission electron microscope (TEM) or a scanning electron microscope (SEM). After determining the particle diameter for multiple carbon black particles by converting the particle diameter of each individual carbon black particle to the diameter of a circle with the same area, the average particle diameter is calculated by calculating the average value using the formula below. Particle size of individual carbon black particles: X1, X2, X3, X4, ..., X i ,···X m Average particle size=ΣX i / m

[0092] Examples of white pigments include inorganic oxides, barium sulfate, calcium carbonate, and other inorganic white pigments. Examples of inorganic oxides include titanium dioxide, zinc oxide, magnesium oxide, silica, and alumina. Among these, inorganic oxides are preferred from the viewpoint of achieving high whiteness and improving light shielding properties, and silica and / or alumina are preferred.

[0093] When silica and / or alumina are used, the average particle size of silica and alumina in the polyester layer (A) is preferably 0.01 to 3 μm, more preferably 0.05 to 2.5 μm, and even more preferably 0.1 to 1 μm. If the average particle size of silica and / or alumina in the polyester layer (A) is below the above upper limit, the dispersibility of the silica and / or alumina in the polyester layer (A) is improved, and the haze of the polyester film is good. If it is above the lower limit, it becomes easier to ensure light shielding properties. The particle size can be measured using the same method as that used for measuring the particle size of carbon black.

[0094] The carbon black content in the polyester layer (A) is preferably 0.001 to 1.2% by mass, more preferably 0.005 to 0.5% by mass, even more preferably 0.01 to 0.3% by mass, and even more preferably 0.02 to 0.1% by mass. The silica and / or alumina content in the polyester layer (A) is preferably 0.001 to 1.2% by mass, more preferably 0.005 to 0.5% by mass, even more preferably 0.01 to 0.3% by mass, and still more preferably 0.02 to 0.1% by mass. If both silica and alumina are present, the total content should satisfy the above ranges. The total pigment content in the polyester layer (A) is preferably 0.001 to 1.2% by mass, more preferably 0.005 to 0.5% by mass, even more preferably 0.01 to 0.3% by mass, and especially preferably 0.02 to 0.15% by mass. In this invention, since a combination of pigment and the blue dye is used, as described above, even with a small amount of pigment, it is possible to impart light-shielding properties to the polyester film while reducing haze. Furthermore, the lightfastness of the polyester layer (A) is also improved.

[0095] The pigment content in the polyester film is preferably 0.001 to 1.2% by mass, more preferably 0.0015 to 0.5% by mass, even more preferably 0.01 to 0.3% by mass, and even more preferably 0.02 to 0.1% by mass.

[0096] The polyester film of the present invention can be compounded with an infrared absorbent. Generally known inorganic oxides can be used as the infrared absorbent, for example, at least one selected from the group consisting of tungsten cesium oxide, indium tin oxide, antimony tin oxide, and lanthanum hexaboride. Among these, tungsten cesium oxide is preferred due to its small impact on haze rise based on its applications and characteristics. The infrared absorbent is preferably included in the polyester layer (A). The amount of infrared absorbent can be adjusted according to the desired transmittance. From the viewpoint of productivity of the polyester film and balancing heat shielding performance and economic efficiency, it is preferable that the amount be 0.3 to 2.0% by mass in the polyester film, and more preferably 0.4 to 1.0% by mass, but this does not limit the scope of the present invention.

[0097] <Layer configuration> If the polyester film of the present invention is a polyester film formed by laminating polyester layers, it is not particularly limited as long as it has the polyester layer (A). For example, the polyester film of the present invention preferably has a polyester layer (A) and a polyester layer (B) on at least one side of the polyester layer (A), and it is more preferable to have polyester layers (B) on both sides of the polyester layer (A). By further having a polyester layer (B) in the polyester film, the bleed-out of the ultraviolet absorber can be suppressed, and furthermore, the polyester layer (A) is protected and durability is improved. A detailed description of the polyester used in polyester layer (B) is as stated above, and will be omitted here. The polyester used in polyester layer (B) may be the same as or different from the polyester used in polyester layer (A).

[0098] It is preferable to incorporate fine particles into the polyester layer (B). By incorporating fine particles, the slipperiness of the surface of the polyester film can be improved. Examples of fine particles to be incorporated into the polyester layer (B) include silica, silicon dioxide, calcium carbonate, kaolin, and organic polymer particles, but silica is preferred from the viewpoint of effectively improving surface slipperiness and from the viewpoint of manufacturing cost. The average particle size of the fine particles in the polyester layer (B) is preferably 0.01 to 5 μm, and more preferably 0.1 to 3 μm. For fine particles, if the fine particles are in powder form, the average particle diameter can be determined by using a centrifugal sedimentation particle size distribution analyzer (SA-CP3 model, manufactured by Shimadzu Corporation) to measure the particle size at which the cumulative volume fraction of 50% of the equivalent spherical distribution occurs (d50). For fine particles in a film or resin chip, the average particle diameter can be determined by observing the film or resin chip using a scanning electron microscope (Hitachi High-Technologies Corporation, "SU8220"), measuring the size of a single particle from the resulting image data, and taking the average of 10 points (10 particles) as the average particle diameter. In the case of non-spherical particles, the average of the longest and shortest diameters was used as the diameter of each particle.

[0099] When fine particles are incorporated into the polyester layer (B), the amount of fine particles incorporated is preferably 0.001 to 0.5% by mass, and more preferably 0.01 to 0.4% by mass, of the total amount of material constituting the polyester layer (B). When the amount of fine particles in the polyester layer (B) is within the above range, the slipperiness can be improved and the haze of the polyester film can be kept low. In addition to the dyes, pigments, and fine particles mentioned above, conventionally known antioxidants, thermal stabilizers, lubricants, etc., may be added to polyester layer (A) and polyester layer (B) as needed.

[0100] <Copolymer polyester containing a benzotriazole group> The polyester film of the present invention must contain a copolymer polyester having a benzotriazole group. If the polyester film has a laminated structure, one of the polyester layers constituting the laminated structure must contain a copolymer polyester having a benzotriazole group. The copolymer polyester having the benzotriazole group is an ultraviolet absorber and imparts an even higher level of light resistance to polyester films. Furthermore, compared to using low-molecular-weight UV absorbers, using copolymer polyester containing benzotriazole groups allows for superior lightfastness with smaller amounts. Therefore, even when halogen-free blue dyes and pigments are used in combination, these components are not affected, and the copolymer polyester containing benzotriazole groups itself does not decompose easily within the polyester film, resulting in stable lightfastness over a long period. In a polyester film using halogen-free blue dyes and pigments, instead of simply mixing in an ultraviolet absorber having a benzotriazole skeleton, using a copolymer polyester having a benzotriazole group allows the copolymer polyester to exhibit high affinity to the film's constituent resin and disperse uniformly. Therefore, even with a larger surface area of ​​the polyester film of the present invention, stable light resistance can be achieved regardless of its location on the film. The polyester film of the present invention not only significantly reduces the risk of UV absorber components bleeding out onto the film surface, but also allows for a smaller amount of UV absorber components to be added. As a result, it becomes easier to adjust the amount of halogen-free blue dye added as a colorant, which has the advantage of making it easier to adjust the film's color tone toward a darker shade. There are no particular restrictions on the polyester constituting the above copolymerized polyester, but it is preferably a polycondensation polymer of a dicarboxylic acid and a diol. Aromatic dicarboxylic acids are preferred as the dicarboxylic acid, and a diol compound having a benzotriazole group is an essential component as the diol, although other aliphatic diols may also be used in combination.

[0101] Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, orthophthalic acid, biphenyl dicarboxylic acid, diphenyl ether-dicarboxylic acid, diphenyl sulfone-dicarboxylic acid, diphenyl ketone-dicarboxylic acid, naphthalenedicarboxylic acid such as 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, and 2,7-naphthalenedicarboxylic acid. Among these, at least one selected from the group consisting of terephthalic acid, isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, and 4,4'-biphenyldicarboxylic acid is preferred, with terephthalic acid being more preferred.

[0102] The diol component must include a diol compound having a benzotriazole group. The diol compound having a benzotriazole group is not particularly limited as long as it has a benzotriazole group, but an example is 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-(2-hydroxyethyl)phenol]. Other aliphatic diols include linear or branched aliphatic diols such as ethylene glycol, 2-butene-1,4-diol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, methylpentanediol, and diethylene glycol; and alicyclic diols such as cyclohexanedimethanol, isosorbide, spiroglycol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, norbornenedimethanol, and tricyclodecanedimethanol. These may be used individually or in combination of two or more as needed.

[0103] The method for producing copolymer polyesters having a benzotriazole group is not particularly limited and can be produced by conventionally known methods. Furthermore, the timing of adding the benzotriazole compound is not particularly limited and can be added at any stage during the polycondensation of the dicarboxylic acid and the diol. In this invention, it is preferable to use a copolymer polyester in which a benzotriazole group is added to a polybutylene terephthalate (PBT) skeleton, as it has good compatibility with polyethylene terephthalate, a close glass transition temperature, and good suitability for film molding. When a copolymer polyester having a benzotriazole group is incorporated into the polyester layer, the amount of the copolymer polyester incorporated is preferably 0.1 to 10% by mass, more preferably 0.5 to 9% by mass, and even more preferably 1 to 9% by mass, based on the total amount of the polyester layer constituting the layer containing the copolymer polyester. Furthermore, the amount of copolymer polyester having a benzotriazole group in the polyester film is preferably 0.1 to 3% by mass, more preferably 0.2 to 2% by mass, even more preferably 0.2 to 0.7% by mass, and even more preferably 0.2 to 0.5% by mass of the total film. When the amount of copolymer polyester having a benzotriazole group in the polyester film is within the above range, the light resistance of the film can be further improved.

[0104] <Thickness> As described above, when the polyester film of the present invention is a polyester film formed by laminating polyester layers, it is not particularly limited as long as it has a polyester layer (A), and it is preferable that polyester layer (B) is present on at least one side of polyester layer (A). When the polyester film of the present invention comprises three or more polyester layers, it is preferable that polyester layer (B) is the outermost layer and polyester layer (A) is the intermediate layer. There are no particular restrictions on the thickness of the polyester layer (A) described above, but it is preferably 5 to 50 μm, more preferably 10 to 40 μm, and even more preferably 15 to 35 μm. Furthermore, in order to ensure high transparency and suppress turbidity of the entire polyester film, it is preferable that the outermost polyester layer (B) be as thin as possible, but it is also preferable that it have a certain thickness from the viewpoint of preventing the ultraviolet absorber component in the intermediate polyester layer (A) from bleeding out. Taking these factors into consideration, the thickness of the polyester layer (B) is usually preferably 0.5 to 8 μm on one side, and more preferably 1.0 to 5 μm.

[0105] The ratio of the thickness of polyester layer (B) to the thickness of polyester layer (A) [(B) / (A)] is preferably 0.05 to 0.5. When the thickness ratio is within this range, the transparency of the polyester film can be maintained while effectively suppressing the bleed-out of ultraviolet absorber components from polyester layer (A). From this viewpoint, the thickness ratio [(B) / (A)] is more preferably 0.07 to 0.4, and even more preferably 0.08 to 0.3. Furthermore, if the polyester film of the present invention has a three-layer structure, for example, with polyester layer (B) as the outermost layer and polyester layer (A) as the intermediate layer, the thickness of each of the outermost polyester layers (B) shall satisfy the above ratio.

[0106] <Easy adhesion layer> The polyester film of the present invention may have an easy-adhesion layer on its outermost surface. Providing an easy-adhesion layer makes it easier to adhere functional layers and the like to the polyester film. The easy-adhesion layer is preferably provided on the side opposite to the side on which polyester layer (B) is provided, for example, when polyester layer (B) is provided on at least one side of polyester layer (A). The easy-adhesion layer is formed from an easy-adhesion layer composition containing a binder resin and a crosslinking agent. When polyester layer (B) is provided on both sides of polyester layer (A), the easy-adhesion layer may be provided on both surfaces of polyester layer (B), but it is sufficient to provide it on at least one surface of polyester layer (B).

[0107] Examples of binder resins include polyester resins, acrylic resins, urethane resins, polyvinyl-based resins such as polyvinyl alcohol, polyalkylene glycols, polyalkyleneimines, methylcellulose, hydroxycellulose, and starches. Among these, polyester resins, acrylic resins, and urethane resins are preferred from the viewpoint of improving adhesion to functional layers. Various known crosslinking agents can be used, such as oxazoline compounds, melamine compounds, epoxy compounds, isocyanate compounds, carbodiimide compounds, and silane coupling compounds. Among these, oxazoline compounds are preferably used from the viewpoint of improving durable adhesion. Melamine compounds are also preferably used from the viewpoint of improving the durability and applicability of the easily bonded layer.

[0108] The easy-adhesion layer composition may contain particles to improve blocking resistance and slipperiness. Specific examples of particles include silica, alumina, kaolin, calcium carbonate, and organic polymer particles. Among these, silica is preferred from the viewpoint of transparency. The average particle diameter is preferably in the range of 0.005 to 1 μm, more preferably 0.01 to 0.5 μm, and even more preferably 0.01 to 0.2 μm, from the viewpoint of improving the transparency and slipperiness of the polyester film. The average particle diameter is the cumulative (weight basis) 50% (D50) value of the equivalent spherical distribution measured using a centrifugal sedimentation particle size distribution analyzer. Furthermore, the easy-adhesion layer composition may contain components that promote crosslinking, such as a crosslinking catalyst. The easy-adhesion layer composition is generally preferably diluted with water, an organic solvent, or a mixture thereof. The easy-adhesion layer is formed by coating the diluted easy-adhesion layer composition onto the outermost surface of a polyester film as a coating solution and then drying it. The coating can be carried out by conventionally known methods. The thickness of the easy-adhesion layer is typically in the range of 0.003 to 1 μm, preferably 0.005 to 0.6 μm, and more preferably 0.01 to 0.4 μm. A thickness of 0.003 μm or more ensures sufficient adhesion. A thickness of 1 μm or less reduces the likelihood of deterioration of appearance or blocking.

[0109] <Visible light transmittance> The visible light transmittance of the polyester film of the present invention is preferably 2 to 80%, more preferably 20 to 75%, even more preferably 30 to 70%, even more preferably 40 to 65%, and particularly preferably 43 to 60%. If the visible light transmittance of the polyester film is above the lower limit, it will have appropriate light-shielding properties and will not become too dark as a window film. On the other hand, if the visible light transmittance is below the upper limit, it is preferable because it will not be too bright. The visible light transmittance can be adjusted to the aforementioned range by adjusting the amount of halogen-free blue dye and pigment.

[0110] <Hayes> The polyester film of the present invention preferably has a haze of 5% or less, more preferably 5.0% or less, even more preferably 4% or less, even more preferably 4.0% or less, particularly preferably 3.5% or less, and among these, 3.2% or less is especially preferable. When the haze is below the above upper limit, turbidity is less likely to occur in the view seen through the polyester film, and sufficient transparency can be ensured. Furthermore, the haze can be adjusted to the aforementioned range by adjusting the amount of halogen-free blue dye and pigment.

[0111] <Bleed-out properties of UV absorbers> The polyester film of the present invention can effectively suppress the bleed-out of ultraviolet absorbers contained in the polyester film. The bleed-out of ultraviolet absorbers in the polyester film can be measured by the method described in the examples.

[0112] <Infrared transmittance> In embodiments of the present invention in which the polyester film contains an infrared absorbent, the average light transmittance of the polyester film of the present invention at 900 to 2500 nm is preferably 70% or less, more preferably 65% ​​or less, even more preferably 60% or less, and even more preferably 58% or less. If the average light transmittance of the polyester film at 900 to 2500 nm is below the above upper limit, the transmittance of near-infrared rays can be significantly reduced. As described above, the polyester film of the present invention has excellent visible light transmittance and, by containing a copolymer polyester having a benzotriazole group, can reduce ultraviolet light transmittance while suppressing the bleed-out of the ultraviolet absorber. In this embodiment, the polyester film of the present invention further contains an infrared absorber, making it possible to reduce the transmittance of ultraviolet and infrared rays without reducing the transmittance of visible light, and thus it can be suitably used in situations where heat shielding is required.

[0113] <Method for manufacturing polyester film for window coverings> Next, the method for manufacturing the polyester film for window coverings of the present invention will be described in detail, but the invention is not limited to the following manufacturing examples.

[0114] First, the halogen-free blue dye and the pigment are added to the polyester. There are no particular restrictions on the method of addition, but it is preferable to prepare a masterbatch of the halogen-free blue dye and the pigment and add these masterbatches during the melt molding of the film. Furthermore, it is particularly preferable to use a twin-screw extruder during the melt molding process in order to ensure good dispersion and mixing with the polyester.

[0115] When the polyester film for window coverings of the present invention has a polyester layer (A) and a polyester layer (B), the raw materials are fed into multiple extruders, and the polyesters are laminated using a multi-manifold die or feed block with multiple layers. The multiple layers of molten sheets are then extruded from the die and cooled and solidified with a cooling roll to obtain an unstretched sheet. In this case, in order to improve the flatness of the sheet, it is preferable to increase the adhesion between the sheet and the rotating cooling drum, and it is preferable to employ an electrostatic application adhesion method and / or a liquid coating adhesion method.

[0116] Next, the obtained unstretched film is stretched in two directions to give it a biaxial orientation. That is, the unstretched sheet is stretched in the longitudinal direction using a roll stretcher. The stretching temperature is usually 70 to 120°C, preferably 80 to 110°C, and the stretching ratio is usually 2.5 to 7 times, preferably 3 to 6 times. Subsequently, the film is stretched in the width direction. The stretching temperature is usually 70-120°C, preferably 80-115°C, and the stretching ratio is usually 3-7 times, preferably 3.5-6 times. Then, the film is heat-treated at a temperature of 170-250°C under tension or under relaxation of 30% or less to obtain a biaxially oriented film. The longitudinal direction of the film refers to the direction in which the film progresses during the film manufacturing process, i.e., the winding direction of the film roll. The width direction refers to the direction parallel to the film surface and perpendicular to the longitudinal direction, that is, the direction parallel to the central axis of the roll when the film is in a roll form.

[0117] In the stretching described above, a method of performing unidirectional stretching in two or more stages can also be used. In that case, it is preferable to perform the stretching so that the final stretching ratios in both directions fall within the above ranges. It is also possible to perform simultaneous biaxial stretching of the unstretched sheet so that the area ratio is 10 to 40 times. Furthermore, if necessary, the sheet may be stretched again in the longitudinal and / or width directions before or after heat treatment.

[0118] The surface of the polyester film obtained by the method described above can be coated as needed, and the coating is preferably used to form the easy-adhesion layer described above. The coating can be done in-line, off-line, or a combination of both, but it is preferable to do it in-line. In in-line coating, a series of processes can be used in which a coating solution mainly diluted with water is applied after longitudinal stretching is completed, followed by drying, preheating, transverse stretching in a tenter, and then heat fixing.

[0119] [Laminated polyester film for window coverings] The polyester film laminate for window application of the present invention has a functional layer provided on at least one surface of the polyester film in order to impart various functions to the polyester film, preferably an adhesive layer as the functional layer. That is, the polyester film laminate for window application of the present invention preferably comprises the polyester film and an adhesive layer provided on the surface of the polyester film. By having an adhesive layer, the polyester film laminate for window application can be easily adhered to window glass. The adhesive layer may be composed of various adhesives such as acrylic adhesives, polyester adhesives, rubber adhesives, and silicone adhesives. Among these, acrylic adhesives are preferred from the viewpoint of adhesive strength, stain resistance to the adherend, and cost. The thickness of the adhesive layer is preferably 1 to 100 μm, more preferably 5 to 75 μm, and even more preferably 15 to 50 μm. When the thickness of the adhesive layer is within the above range, transparency can be ensured while maintaining sufficient strength of the adhesive layer. On the other hand, in the polyester film laminate for window coverings of the present invention, the polyester film used may be a single sheet, or it may be a configuration having multiple polyester films bonded together with an adhesive layer in between. In the bonded configuration, polyester films of the same color tone may be bonded together, or polyester films of different color tones may be bonded together. In that case, there is the advantage of increasing the variety (color lineup) of the resulting polyester film laminate for window coverings.

[0120] Furthermore, in the polyester film laminate for window application of the present invention, a hard coat layer may be provided on the surface of the polyester film as a functional layer. By providing a hard coat layer, it is possible to prevent the surface of the polyester film from being damaged. The hard coat layer is preferably a cured layer formed by curing a known hard coat agent. The hard coat agent is not particularly limited, but an active energy ray curable composition may be used. Active energy rays refer to active rays such as ultraviolet rays and electron beams. The hard coat agent may contain polymerizable monomers or polymerizable oligomers that form a cured product upon irradiation with active energy rays, for example, at least one of (meth)acrylate monomers or (meth)acrylate oligomers. More specifically, it may contain urethane (meth)acrylate, polyester (meth)acrylate, epoxy (meth)acrylate, melamine (meth)acrylate, polyfluoroalkyl (meth)acrylate, silicone (meth)acrylate, etc. The hard coat agent may contain additives such as crosslinking agents, polymerization initiators, lubricants, plasticizers, organic particles, inorganic particles, antifouling agents, antioxidants, and catalysts, as needed. The thickness of the hard coat layer is not particularly limited, but is, for example, in the range of 0.5 to 15 μm, preferably 1 to 10 μm.

[0121] In the polyester film laminate for window application of the present invention, when a hard coat layer is provided, it is preferable that an adhesive layer is provided on one surface of the polyester film and a hard coat layer is provided on the other surface. That is, it is preferable that the polyester film laminate for window application of the present invention has the adhesive layer on the surface opposite to the surface of the polyester film for window application on which the hard coat layer is provided. With such a configuration, the hard coat layer can prevent scratches from occurring on the surface of the polyester film that is adhered to the window glass via the adhesive layer. When functional layers such as an adhesive layer or a hard coat layer are provided, the surface of the polyester film on which the functional layer is provided may be subjected to corona discharge treatment or the above-mentioned easy-adhesion layer may be provided in order to improve adhesion. Furthermore, when a hard coat layer is provided, it is preferable that the above-mentioned easy-adhesion layer be provided on the surface of the polyester film on which the hard coat layer is provided, from the viewpoint of improving adhesion.

[0122] If the polyester film laminate for window application has an adhesive layer, it may further have a release film laminated on the surface of the adhesive layer. By having a release film, the adhesive layer of the polyester film laminate for window application can be protected before being bonded to the window glass. Furthermore, the release film can be peeled off when bonding the polyester film laminate for window application to the window glass, and the exposed adhesive layer can then bond the polyester film laminate to the window glass. Examples of release films include films surface-treated with a release agent such as a silicone-based release agent, or a non-silicone-based release agent such as a long-chain alkyl resin or an olefin resin.

[0123] The polyester film and laminate for window application of the present invention are intended for use by laminating them onto window glass of various vehicles such as automobiles, buildings, and the like. The polyester film and laminate for window application of the present invention have good light resistance and can minimize fading even after long-term use. Furthermore, since halogen-free blue dyes are used, there is no adverse impact on the environment when disposed of. In addition, infrared absorbers can be included, making them suitable for use in situations where heat shielding is required.

[0124] <Explanation of terms, etc.> Generally, a "sheet," according to the JIS definition, refers to a thin, flat product whose thickness is small relative to its length and width, while a "film," generally, refers to a thin, flat product whose thickness is extremely small relative to its length and width, with a maximum thickness arbitrarily limited, and which is usually supplied in roll form (Japanese Industrial Standard; JIS K 6900). However, the boundary between sheets and films is not clear, and there is no need to distinguish between the two in the wording of this invention, so in this invention, the term "film" includes "sheets," and the term "sheet" includes "film."

[0125] Furthermore, in this specification, when "X~Y" (where X and Y are any numbers) is written, unless otherwise specified, it includes the meaning of "greater than or equal to X and less than or equal to Y," as well as "preferably greater than X" or "preferably less than Y." Furthermore, when "X or greater" (where X is any number) is written, unless otherwise specified, it includes the meaning of "preferably greater than X," and when "Y or less" (where Y is any number) is written, unless otherwise specified, it also includes the meaning of "preferably less than Y." [Examples]

[0126] The present invention will be described in more detail by reference to examples, but the present invention is not limited in any way by these examples.

[0127] [Evaluation Method] The polyester films obtained in the examples and comparative examples were evaluated according to the following methods. (1)Visible light transmittance The light transmittance at each wavelength was measured using a spectrophotometer SE-2000 (manufactured by Nippon Denshoku Co., Ltd.), and the visible light transmittance was calculated according to JIS-A 5759:2016.

[0128] (2) Film turbidity (haze) In accordance with JIS K 7136:2000, the turbidity (haze) of the polyester film was measured using a turbidimeter NDH300A (manufactured by Nippon Denshoku Co., Ltd.).

[0129] (3) Thickness of the polyester film and the thickness of each layer Small pieces of polyester film were embedded in epoxy resin, and sections were cut using a microtome to observe the cross-section in the thickness direction. These sections were then observed using a transmission electron microscope. Within the cross-section, the lamination interface was observed as varying in brightness, approximately parallel to the film surface. The distance from this interface to the film surface was measured using a transmission electron microscope image, and the average value calculated from all measured values ​​was defined as the thickness.

[0130] (4) Color difference (lightfastness) The polyester film before testing was measured using a colorimeter (SE6000 model, manufactured by Nippon Denshoku Industries Ltd., using a C light source), and L was determined in accordance with JIS Z 8781-4:2013. * ,a * ,b * The result was calculated. Subsequently, the polyester film was irradiated with UV light under the following conditions using a metal weather tester (KW-R5TP-A model, manufactured by Daipla Wintes Co., Ltd.). The polyester film after testing was also subjected to the same method as before the test. * ,a * ,b * The following formula is used to calculate the color difference ΔE before and after the test. * ab The result was calculated. ΔE * abThe smaller the value, the less color change (fading) caused by UV light irradiation, indicating superior lightfastness. <Measurement conditions> Illuminance 140mW / cm 2 Irradiation time: 32 hours (LIGHT (50℃, 50%RH)) Formula:ΔE * ab =[(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2 ] 1 / 2 The above measurement conditions are equivalent to approximately 9 months of normal outdoor exposure.

[0131] (5) Infrared (900~2500nm) average transmittance Spectrophotometer (V-670) manufactured by JASCO Corporation was used to measure spectral light transmittance, and the transmittance in the wavelength range of 900 to 2500 nm was averaged to calculate the average transmittance.

[0132] (6) Bleed-out properties of UV absorbers The film used was the one that had undergone the lightfastness test described in item (4) above. Using an X-ray photoelectron spectroscopy system (Thermo Fisher Scientific K-Alpha), the amount of N element was measured under the following conditions, and the bleed-out properties of the ultraviolet absorber were evaluated according to the following criteria. Excitation X-ray: monochromated Al Kα X-linear: Ellipse (major axis length: 400 μm) Photoelectron escape angle: 90 degrees (angle between the sample surface and the detector) Energy correction: The binding energy value of the C1S main peak was adjusted to 284.8 eV. (Judgment criteria) ○: Detected amount of N element is less than 0.1 ppm ×: Detected amount of N element is 0.1 ppm or higher

[0133] (7) Intrinsic viscosity of polyester One g of polyester, from which incompatible components had been removed, was accurately weighed, dissolved in 100 ml of a mixed solvent of phenol and tetrachloroethane [phenol / tetrachloroethane = 50 / 50 (mass ratio)], and measured at 30°C.

[0134] (8) Average particle size of fine particles The average particle diameter was defined as the particle diameter at which the cumulative volume fraction reached 50% in the equivalent spherical distribution of fine particles measured using a centrifugal sedimentation particle size distribution analyzer (SA-CP3 type) manufactured by Shimadzu Corporation.

[0135] [Raw materials] <Polyester A> A polyethylene terephthalate monopolymer with an intrinsic viscosity of 0.63 dl / g.

[0136] <Polyester B> A polyethylene terephthalate monopolymer containing 0.6% by mass of amorphous silica particles with an average particle diameter of 2.3 μm, and having an intrinsic viscosity of 0.61 dl / g.

[0137] <Polyester C> Polyester C is a polyester produced by melt-mixing polyethylene terephthalate and a colorant and then forming it into chips. More specifically, Polyester C is a mixture of polyethylene terephthalate and a colorant in a ratio of 90:10 (by mass). Polyester C contains 4.5% by mass of Disperse Blue 60, 1.5% by mass of Solvent Brown 53, 0.8% by mass of carbon black (average primary particle size 30 nm), and also contains Solvent Red 52. The Disperse Blue 60 used in polyester C is a halogen-free anthraquinone-based blue dye, and its structural formula is as follows.

[0138] [ka]

[0139] <Polyester D> Polyester D is produced by melting and mixing polyethylene terephthalate and a colorant and then forming it into chips. More specifically, Polyester D is a mixture of polyethylene terephthalate and a colorant in a ratio of 85:15 (by mass). The colorant content in polyester D is 7% by mass of Disperse Blue 60, 6% by mass of Solvent Brown 53, and Solvent Red 52.

[0140] <Polyester E> Polyester E is a polyester produced by melt-mixing polyethylene terephthalate and a colorant and then forming it into chips. More specifically, Polyester E is a mixture of polyethylene terephthalate and a colorant in a ratio of 90:10 (by mass). Polyester E contains 4.5% by mass of Disperse Blue 60, 1.5% by mass of Solvent Brown 53, 0.6% by mass of silica (average particle size 2.3 μm), and also contains Solvent Red 52.

[0141] <Polyester F> Polyester F is a polyester produced by melt-mixing polyethylene terephthalate and a colorant and then forming it into chips. More specifically, Polyester F is a mixture of polyethylene terephthalate and a colorant in a ratio of 90:10 (by mass). Polyester F contains 4.5% by mass of Disperse Blue 60, 1.5% by mass of Solvent Brown 53, 0.8% by mass of alumina (average particle size 0.05 μm), and also contains Solvent Red 52.

[0142] <Polyester G> Polyester G is a polyester produced by melt-mixing polyethylene terephthalate and a colorant and then forming it into chips. More specifically, Polyester G is a mixture of polyethylene terephthalate and a colorant in a ratio of 90:10 (by mass). The colorants in polyester G are Solvent Blue 97 at 4.0% by mass, Solvent Blue 104 at 2.0% by mass, and carbon black (average primary particle size 30 nm) at 0.8% by mass. Solvent Red 179 and Solvent Green 3 are also included. Furthermore, Solvent Blue 97 and Solvent Blue 104, used in polyester G, are halogen-free anthraquinone-based blue dyes, and their structural formulas are as follows.

[0143] [ka] Solvent Blue 97

[0144] [ka] Solvent Silver 104

[0145] <Polyester H> Polybutylene terephthalate (UVAPBT, manufactured by Yamato Kasei Co., Ltd.) containing 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(2-hydroxyethyl)phenol] (manufactured by Yamato Kasei Co., Ltd.: DAINSORB T-33) was used.

[0146] <Polyester I> Polyester I was obtained by adding 5.0% by mass of an ultraviolet absorber (Chinubin 1577, manufactured by Tokyo Ink Co., Ltd.) to polyester A.

[0147] <Polyester J> A copolymerized polybutylene terephthalate (UVAPBT, manufactured by Daiwa Chemical Industries, Ltd.) containing 30% by mass of units derived from 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-(2-hydroxyethyl)phenol] (manufactured by Daiwa Chemical Industries, Ltd.: DAINSORB T-33) with a benzotriazole group was used.

[0148] <Polyester K> Polyester K was obtained by melt-kneading polyethylene terephthalate with 10% by mass of tungsten cesium oxide to form chipped polyester K.

[0149] [Example 1] A blend of polyester A, C, and J chips in a mass ratio of 94:4:2 was fed into the intermediate layer extruder as the resin for the polyester layer (A). Separately, a blend of polyester A and B chips in a mass ratio of 78:22 was fed into the surface extruder as the resin for the polyester layer (B). Each extruder was a twin-screw extruder with vents and different orientations. The resin was extruded at a melting temperature of 290°C without drying, and the molten polymer was then combined and laminated in a feed block. Next, the sheets were cooled and solidified on a cooling roll with a surface temperature set to 25°C using an electrostatic application adhesion method to obtain a laminated, unstretched sheet with a 2-type, 3-layer structure. The obtained sheets were stretched longitudinally at 85°C and 3.3 times their original length. Subsequently, the film was guided into a tenter and stretched transversely at 110°C to 4.2 times its original length. After heat setting at 235°C, it was further relaxed by 5% in the width direction at 200°C to create a polyester film. The thickness of each layer in the obtained polyester film was 2 μm for the surface polyester layer (B) and 21 μm for the intermediate polyester layer (A), for a total thickness of 25 μm. The properties of the obtained polyester film are shown in Table 1.

[0150] [Example 2] A blend of polyester A and C chips in a mass ratio of 96:4 was fed into an extruder for the intermediate layer as the resin for the polyester layer (A). Separately, a blend of polyester A, B, and J chips in a mass ratio of 70:22:8 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0151] [Example 3] A blend of polyester A, C, J, and K chips in a mass ratio of 91:2:2:5 was fed into an extruder for the intermediate layer as the resin for the polyester layer (A). Separately, a blend of polyester A and B chips in a mass ratio of 78:22 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0152] [Comparative Example 1] A blend of polyester A and D chips in a mass ratio of 96:4 was fed into the intermediate layer extruder as the resin for the polyester layer (A). Separately, a blend of polyester A and B chips in a mass ratio of 78:22 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0153] [Comparative Example 2] A blend of polyester A and E chips in a mass ratio of 96:4 was fed into the intermediate layer extruder as the resin for the polyester layer (A). Separately, a blend of polyester A and B chips in a mass ratio of 78:22 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0154] [Comparative Example 3] A blend of polyester A, F, and I chips in a mass ratio of 75:5:20 was fed into the intermediate layer extruder as the resin for the polyester layer (A). Separately, a blend of polyester A and B chips in a mass ratio of 78:22 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0155] [Comparative Example 4] A blend of polyester A and F chips in a mass ratio of 95:5 was fed into the intermediate layer extruder as the resin for the polyester layer (A). Separately, a blend of polyester B and I chips in a mass ratio of 22:78 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0156] [Comparative Example 5] A blend of polyester A, G, and H chips in a mass ratio of 94.2:5.5:0.3 was fed into an extruder for the intermediate layer as the resin for the polyester layer (A). Separately, a blend of polyester A and B chips in a mass ratio of 78:22 was fed into the surface extruder as the resin for the polyester layer (B). Except for the above, the manufacturing process was carried out in the same manner as in Example 1 to obtain a polyester film. The properties of this film are shown in Table 1.

[0157] [Table 1]

[0158] [Table 2]

[0159] As is clear from the results in Table 2, the polyester window film of the present invention exhibits excellent light resistance despite its low content of UV absorbers. Furthermore, because the polyester window film of the present invention uses a halogen-free blue dye, it has minimal adverse environmental impact when disposed of.

[0160] Furthermore, compared to Comparative Examples 1 and 2, Examples 1 to 3 do not inhibit the color development of the blue dye even when UV absorber components are used in combination, and the color difference (lightfastness) is improved. This demonstrates that even when halogen-free blue colorants and pigments are used in combination, the results are suitable for practical use. Furthermore, Examples 1-3 showed minimal bleed-out of the UV absorber component and exhibited good light resistance even under harsh usage conditions. In particular, they can be suitably used in situations where a high level of light resistance is required, such as when sunlight is strong in the summer. In addition, Example 3 contains an infrared absorber and can be suitably used in situations where heat shielding is required, thus enabling the provision of a polyester window film with even greater industrial value.

Claims

1. A polyester film for window coverings, comprising a halogen-free blue dye, pigment, copolymer polyester having a benzotriazole group, and tungsten cesium oxide as an infrared absorber in the polyester layer.

2. A polyester film for window covering according to claim 1, comprising a polyester layer (A) and a polyester layer (B) on at least one surface of the polyester layer (A).

3. The polyester film for window covering according to claim 2, wherein the ratio of the thickness of polyester layer (B) to the thickness of polyester layer (A) [(B) / (A)] is 0.05 to 0.

5.

4. The polyester film for window covering according to claim 2 or 3, wherein the polyester layer (A) contains the halogen-free blue dye and pigment, and the content of the halogen-free blue dye in the polyester layer (A) is 0.01 to 2% by mass.

5. The polyester film for window covering according to claim 4, wherein the pigment content in the polyester layer (A) is 0.001 to 1.2% by mass.

6. The polyester film for window covering according to any one of claims 1 to 5, wherein the halogen-free blue dye is a halogen-free anthraquinone-based blue dye.

7. The polyester film for window covering according to claim 6, wherein the halogen-free anthraquinone-based blue dye is a compound represented by the following general formula (I). 【Chemistry 1】 (In the formula, R １ and R ４ Each of these independently represents a substituted or unsubstituted amino group, R ２ , R ３ , R ５ ~R ８ Each of these independently represents a hydrogen atom or a substituent, R ２ and R ３ (They may be bonded to each other, forming a ring.)

8. The polyester film for window coverings according to claim 7, wherein the halogen-free anthraquinone-based blue dye is a compound represented by the following general formula (III-a) or a compound represented by the following general formula (IV). 【Chemistry 2】 (wherein X １１ represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.) 【Transformation 3】 (In the formula, X ２１ ~X ２４ Each of these independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a phenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.

9. The polyester film for window covering according to any one of claims 1 to 8, wherein the pigment is carbon black.

10. The polyester film for window covering according to any one of claims 1 to 8, wherein the pigment is silica and / or alumina.

11. A polyester film for window covering according to claim 1, wherein the average transmittance in the range of 900 nm to 2500 nm is 70% or less.

12. A laminate of a polyester film for window application, comprising a polyester film for window application according to any one of claims 1 to 11, and a hard coat layer provided on the surface of the polyester film for window application.

13. A laminate of a polyester film for window application, comprising a polyester film for window application according to any one of claims 1 to 11, and an adhesive layer provided on the surface of the polyester film for window application.

14. The window-attached polyester film laminate according to claim 12, wherein an adhesive layer is provided on the side of the window-attached polyester film opposite to the side on which the hard coat layer is provided.

15. The window-applying polyester film laminate according to claim 13 or 14, further comprising a release film on the surface of the adhesive layer.

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