Film, polarizing sheet, heat-bend molded body, and sunglasses

Abstract

Provided are a film having low light transmittance at a wavelength of 420 nm or less and excellent heat resistance, and a polarizing sheet, a heat-bend molded body, and sunglasses. A film according to the present disclosure includes an aromatic polycarbonate resin, an ultraviolet absorber having a triazine structure, and a specific wavelength absorption dye having a maximum absorption wavelength between wavelengths of 400-440 nm.

Description

Film, polarizing sheet, heat-bent molded product, and sunglasses

[0001] The present invention relates to a film, a polarizing sheet, a heat-bent molded product, and sunglasses, and more particularly to a film containing a polycarbonate resin as a main component.

[0002] Polycarbonate resin is produced by condensation polymerization of an aromatic diol such as bisphenol A and a carbonate precursor such as phosgene. It has excellent impact strength, numerical stability, heat resistance, and transparency, and is used in a wide range of fields, including exterior materials for electrical and electronic products, automotive parts, building materials, and optical components.

[0003] On the other hand, optical lenses used in sunglasses and the like are required to have a transmittance sufficient to prevent glare from external light sources while not affecting the field of view. Also, it is necessary to protect the eyes from harmful light rays of specific wavelengths, such as ultraviolet rays. Therefore, various technologies have been developed for using polycarbonate resins, which have excellent optical properties in addition to mechanical properties, in optical lenses for sunglasses and other outdoor activities (e.g., Patent Documents 1 and 2).

[0004] JP 2019-202542 A International Publication No. 2019 / 066493

[0005] As mentioned above, the incorporation of UV absorbers into polycarbonate resins used in sunglasses lenses has been investigated. However, when attempting to provide sunglasses with vision correction capabilities, the lens thickness varies depending on the eyeglass prescription. Therefore, it is necessary to incorporate UV absorbers into layers other than the lens. Sunglasses or eyeglasses have a layer structure, such as that shown in FIG. 1 , specifically, a lens 1 and a polarizing film 2, with polarizing film substrates 3 and 4 typically provided on both sides of the polarizing film 2. If a UV absorber is not incorporated into lens 1, it is possible to incorporate a UV absorber into polarizing film substrate 3 or polarizing film substrate 4. Meanwhile, for the prevention of cataracts, etc., it is necessary to block light in the wavelength range up to about 420 nm. Furthermore, depending on the application of the sunglasses, heat resistance may be required. The present invention aims to solve these problems by providing a film, a polarizing sheet, a heat-bent molded product, and sunglasses that have low light transmittance at wavelengths of 420 nm or less and excellent heat resistance.

[0006] In light of the above-mentioned problems, the inventors have conducted studies and have found that the above-mentioned problems can be solved by the following means. [1] A film comprising an aromatic polycarbonate resin, an ultraviolet absorber having a triazine structure, and a specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm. [2] The film according to [1], wherein the film has a thickness of 200 to 500 μm. [3] The film according to [1] or [2], wherein the concentration of the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm is 2 to 50 ppm by mass per 100 parts by mass of the aromatic polycarbonate resin. [4] The film according to any one of [1] to [3], wherein the ultraviolet absorber having a triazine structure includes a compound represented by formula (UV-1). (In formula (UV-1), R １ is a hydrocarbon group having 1 to 10 carbon atoms or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and —O— and / or —C(═O)—, and R ２ ~R ４are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-, n2 is an integer of 0 to 3, and n3 and n4 are each independently an integer of 0 to 4. [5] The film according to [4], wherein n3 and n4 are each independently an integer of 1 to 4. [6] The film according to any one of [1] to [3], wherein the ultraviolet absorber having a triazine structure includes a compound represented by formula (UV-2). (In formula (UV-2), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms, and R ２ , R ３２ , and R ４２ are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-, and n2, n3-1, and n4-1 are each independently an integer of 0 to 3.) [7] The film according to any one of [1] to [3], wherein the ultraviolet absorber having a triazine structure includes a compound represented by formula (UV-3): (In formula (UV-3), R １１ and R ３１ , R ４１are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms.) [8] The film according to any one of [1] to [7], wherein the film has a light transmittance of less than 15% at a wavelength of 420 nm. [9] The film according to any one of [1] to [8], wherein the film has a light transmittance of less than 15% at a wavelength of 380 nm.

[10] The film according to any one of [1] to [9], wherein the content of aromatic polycarbonate resin in the film is 85% by mass or more, relative to 100% by mass of the film.

[11] The film according to any one of [1] to

[10] , wherein the content of ultraviolet absorber having a triazine structure in the film is 0.3% by mass or more and 3.0% by mass or less, relative to 100% by mass of the film.

[12] The film according to any one of [1] to

[11] , wherein the mass ratio of the ultraviolet absorber having a triazine structure to the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm (ultraviolet absorber having a triazine structure / specific wavelength absorbing dye (C) having an absorption maximum in the wavelength range of 400 to 440 nm) is 0.10 or more and 0.30 or less.

[13] The film according to any one of [1] to

[12] , wherein the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm includes a porphyrin dye having an absorption maximum in the wavelength range of 400 to 440 nm.

[14] The film according to any one of [1] to

[13] , wherein the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm includes a dye whose absorption spectrum has a half-width of 50 nm or less in the wavelength range of 400 to 440 nm.

[15] A film having a thickness of 200 to 500 μm, a concentration of a specific wavelength absorbing dye having a maximum absorption wavelength in a wavelength range of 400 to 440 nm is 2 to 50 mass ppm relative to 100 parts by mass of the aromatic polycarbonate resin, the ultraviolet absorber having a triazine structure contains a compound represented by formula (UV-3), the light transmittance of the film at a wavelength of 420 nm is less than 15%, and the light transmittance of the film at a wavelength of 380 nm is 3% or less, the content of the aromatic polycarbonate resin in the film is 85% or more by mass relative to 100% by mass of the film, and the content of the ultraviolet absorber having a triazine structure in the film is 0.3% or more by mass and 3.0% or less by mass relative to 100% by mass of the film, The film according to any one of [1] to

[14] , wherein the mass ratio of the ultraviolet absorber having a triazine structure to the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm (ultraviolet absorber having a triazine structure / specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm) in the film is 0.10 or more and 0.30 or less, the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm includes a porphyrin dye having an absorption maximum in the wavelength range of 400 to 440 nm, and the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm includes a dye whose absorption spectrum has a half-width of 50 nm or less in the wavelength range of 400 to 440 nm. (In formula (UV-3), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms.)

[16] A polarizing sheet having the film according to any one of [1] to

[15] and a polarizing film.

[17] A heat-bent product of the polarizing sheet according to

[16] .

[18] Sunglasses having the polarizing sheet according to

[16] .

[0007] The present invention makes it possible to provide a film having low transmittance for light having a wavelength of 420 nm or less and excellent heat resistance, as well as a polarizing sheet, a heat-bent product, and sunglasses.

[0008] FIG. 2 is a schematic diagram illustrating an example of a layer structure of the heat-bent molded body of the present embodiment.

[0009] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the following present embodiment is an example for explaining the present invention, and the present invention is not limited to this embodiment. Note that in this specification, "to" is used to mean that the numerical values ​​written before and after it are included as the lower limit and upper limit. "A to B" means A or more and B or less. Furthermore, with regard to the upper and lower limit values ​​of numerical values ​​in this specification, any combination of the upper and lower limit values ​​can be cited as an example of this embodiment.

[0010] In this specification, various physical properties and characteristic values ​​are those at 23° C. unless otherwise specified.

[0011] In this specification, unless otherwise specified, weight-average molecular weight is measured by gel permeation chromatography. Specifically, an LC-20AD system (manufactured by Shimadzu Corporation) was used as the gel permeation chromatography apparatus, and an LF-804 (manufactured by Shodex Corporation) was connected as the column. The column temperature was set to 40°C. An RID-10A (manufactured by Shimadzu Corporation) RI detector was used. Chloroform was used as the eluent, and a calibration curve was prepared using standard polystyrene (manufactured by Tosoh Corporation).

[0012] In this specification, unless otherwise specified, the glass transition temperature (Tg) is a value measured by differential scanning calorimetry (DSC) in accordance with ISO 11357. Two cycles of temperature increase and decrease are performed according to the differential scanning calorimetry (DSC measurement) conditions, and the glass transition temperature during the second temperature increase cycle is measured. The intersection of a line extending the low-temperature baseline to the high-temperature side and a tangent to the inflection point is taken as the glass transition temperature and Tg. Measurement starting temperature: 30°C, heating rate: 10°C / min, final temperature: 250°C, and heating rate: 20°C / min. The unit is °C. A differential scanning calorimeter (DSC, manufactured by Hitachi High-Tech Science Corporation, "DSC7020") can be used as the measuring device.

[0013] As used herein, "film" refers to a generally flat molded body that is thin relative to its length and width. The term "film" as used herein also includes "sheet." A film may be single-layered or multi-layered. In this specification, ppm means mass ppm. If the measurement methods described in the standards shown in this specification vary from year to year, they shall be based on the standards in effect as of January 1, 2024, unless otherwise specified. If the measurement methods described in the standards shown in this specification are discontinued as of January 1, 2024, they shall be based on the standards in effect at the time of discontinuation. The scale of Figure 1 may not be consistent with reality.

[0014] The film of the present embodiment is characterized by containing an aromatic polycarbonate resin, an ultraviolet absorber having a triazine structure (sometimes referred to herein as a "triazine-based ultraviolet absorber"), and a specific wavelength absorbing dye having a maximum absorption wavelength between 400 and 440 nm (sometimes referred to herein simply as "specific wavelength absorbing dye (C)"). This configuration allows for a film to be obtained that has low light transmittance at wavelengths of 420 nm or less and excellent heat resistance. The use of a yellow dye to block light with a wavelength of 420 nm has been considered. However, yellow dyes tend to make the resulting film too yellow and also tend to absorb light in wavelength regions where light blocking properties are not required. In particular, when polycarbonate resin films containing a yellow dye are laminated to both sides of a polarizing film, color change tends to occur more easily than with polycarbonate resin films that do not contain a yellow dye. This color change is particularly significant when the film is heated. In this embodiment, by using a UV absorber having a triazine structure in combination with a specific wavelength absorbing dye having an absorption maximum wavelength between 400 and 440 nm, it is possible to effectively block light up to wavelengths of approximately 420 nm while minimizing color change even when heated. This is presumably because the specific wavelength absorbing dye (C) exhibits a sharp absorption spectrum, and therefore is able to fully absorb light in the wavelength range of approximately 400 to 420 nm even in small amounts. Furthermore, it is presumed that the use of a triazine-based UV absorber is able to fully absorb light in the wavelength range of approximately 380 nm while minimizing color change due to heat resistance. Furthermore, by using a triazine-based UV absorber and a specific wavelength absorbing dye (C), the film of this embodiment tends to effectively suppress roll contamination caused by additives.

[0015] Hereinafter, the embodiments of the present invention will be described in detail. However, the explanation of the constituent elements described below is an example of an embodiment of the present invention, and the present invention is not limited to these contents.

[0016] <Aromatic Polycarbonate Resin> The film of this embodiment contains an aromatic polycarbonate resin. The aromatic polycarbonate resin of this embodiment is, for example, a polycarbonate resin in which 80% by mass or more of the structural units constituting the polycarbonate resin are structural units derived from aromatic monomers. The proportion of structural units derived from aromatic monomers in the polycarbonate resin used in this embodiment is preferably 85% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 99% by mass or more. Examples of the aromatic monomer include bisphenol A, bisphenol C, and bisphenol AP. bisphenol A and / or bisphenol AP are preferred, and bisphenol A is more preferred. An example of the aromatic polycarbonate resin used in this embodiment is a resin containing structural units represented by formula (A) in a proportion of 80% by mass or more of all structural units. The proportion of structural units represented by formula (A) in the aromatic polycarbonate resin used in this embodiment may be 100% by mass excluding the terminal groups. Formula (A) In the above formula (A), n is an arbitrary number.

[0017] In the present embodiment, examples of the diol component constituting the aromatic polycarbonate resin include 4,4'-isopropylidenediphenol, as well as bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, bisphenol A, 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol A, 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol B, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol C, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol D, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol E, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol B, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol C, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol E, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol B, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol B, 2,2-bis(4-hydroxyphenyl)ethane, bisphenol C ... B, 2,2 Examples include 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3-chlorophenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxyphenyl)diphenylmethane, and a,ω-bis[3-(o-hydroxyphenyl)propyl]polydimethylsiloxane.

[0018] The molecular weight of the aromatic polycarbonate resin in this embodiment is not particularly limited, but is preferably 20,000 or more, more preferably 30,000 or more, in weight-average molecular weight. The weight-average molecular weight is preferably 100,000 or less, more preferably 70,000 or less. By setting the weight-average molecular weight to the above-mentioned lower limit or more, the strength of the resulting multilayer body for hot bending can be increased. By setting the weight-average molecular weight to the above-mentioned upper limit or less, moldability tends to be improved. In this embodiment, two or more aromatic polycarbonate resins in this embodiment having different weight-average molecular weights may be mixed and used, in which case the weight-average molecular weight refers to the weight-average molecular weight of the mixture.

[0019] The glass transition temperature (Tg) of the aromatic polycarbonate resin in this embodiment is preferably 160° C. or lower, more preferably 155° C. or lower, even more preferably 154° C. or lower, still more preferably 153° C. or lower, even more preferably 152° C. or lower, and still more preferably 151° C. or lower. The glass transition temperature (Tg) of the aromatic polycarbonate resin in this embodiment is, for example, 140° C. or higher, and may further be 143° C. or higher, 145° C. or higher, 147° C. or higher, or 148° C. or higher. When the resin composition in this embodiment contains two or more aromatic polycarbonate resins, the glass transition temperature of the aromatic polycarbonate resin is the sum of the values ​​obtained by multiplying the glass transition temperatures of the respective aromatic polycarbonate resins by their mass fractions.

[0020] For details of the aromatic polycarbonate resin, the descriptions in paragraphs 0011 to 0020 of JP-A-2012-144604 and the descriptions in paragraphs 0014 to 0035 of JP-A-2019-002023 can be referred to as long as they do not deviate from the spirit of this embodiment, and the contents of these can be incorporated into this specification.

[0021] The content of the aromatic polycarbonate resin in the film of this embodiment is preferably 85% by mass or more, more preferably 90% by mass or more, even more preferably 94% by mass or more, even more preferably 96% by mass or more, and even more preferably 97% by mass or more, based on 100% by mass of the film. Furthermore, the content of the aromatic polycarbonate resin in the film of this embodiment is preferably such that, based on 100% by mass of the film, all components other than the triazine-based ultraviolet absorber and the specific wavelength absorbing dye (C) are aromatic polycarbonate resin. When the film of this embodiment contains two or more aromatic polycarbonate resins, the total content is preferably within the above range.

[0022] <UV Absorber Having a Triazine Structure> The film of this embodiment contains a triazine-based UV absorber. Use of a triazine-based UV absorber can reduce light transmittance in the wavelength region of 380 to 420 nm and further improve heat resistance. In particular, color change after heating the film can be effectively suppressed. Furthermore, use of a triazine-based UV absorber tends to effectively suppress roll contamination during film production. The triazine-based UV absorber used in this embodiment is preferably a triazine-based UV absorber having a maximum absorption wavelength of preferably 300 nm or more, more preferably 310 nm or more, even more preferably 330 nm or more, and even more preferably 350 nm or more, and preferably 420 nm or less, more preferably 400 nm or less, even more preferably 390 nm or less, and even more preferably 380 nm or less.

[0023] The triazine-based ultraviolet absorber used in the present embodiment is not particularly limited in terms of type, etc., but preferably contains a compound represented by formula (UV-1), more preferably contains a compound represented by formula (UV-2), and further preferably contains a compound represented by formula (UV-3). (In formula (UV-1), R １ is a hydrocarbon group having 1 to 10 carbon atoms or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and —O— and / or —C(═O)—, and R ２ ~R ４ are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-, n2 is an integer of 0 to 3, and n3 and n4 are each independently an integer of 0 to 4.

[0024] R １is a hydrocarbon group having 1 to 10 carbon atoms or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms with -O- and / or -C(=O)-, more preferably an aliphatic hydrocarbon group having 1 to 10 carbon atoms or a group consisting of a combination of an aliphatic hydrocarbon group having 1 to 10 carbon atoms with -O- and / or -C(=O)-, even more preferably an aliphatic hydrocarbon group having 1 to 10 carbon atoms, still more preferably a straight-chain aliphatic hydrocarbon group having 3 to 10 carbon atoms, and even more preferably a straight-chain alkyl group having 3 to 10 carbon atoms. R １ The number of carbon atoms in the hydrocarbon group (preferably an aliphatic hydrocarbon group, more preferably an alkyl group) as the alkyl group is preferably 2 or more, more preferably 3 or more, even more preferably 4 or more, and still more preferably 5 or more, and is preferably 9 or less, more preferably 8 or less, and even more preferably 7 or less.

[0025] R ２ ~R ４ are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and —O— and / or —C(═O)—, and R ２ ~R ４ At least one of R is a hydroxyl group, ２ ~R ４ At least one of the other R is preferably a hydrocarbon group having 1 to 10 carbon atoms, or a group formed by combining a hydrocarbon group having 1 to 10 carbon atoms with —O— and / or —C(═O)—. ２ ~R ４ The hydrocarbon group having 1 to 10 carbon atoms as R may be an aliphatic hydrocarbon group or an aromatic hydrocarbon group, and is preferably a straight-chain aliphatic hydrocarbon group (preferably a straight-chain alkyl group) or a phenyl group. ２ ~R ４ The number of carbon atoms in the hydrocarbon group having 1 to 10 carbon atoms as the alkyl group is preferably 2 or more, more preferably 3 or more, even more preferably 4 or more, and still more preferably 5 or more, and is preferably 9 or less, more preferably 8 or less, and even more preferably 7 or less.

[0026] n2 is an integer from 0 to 3, preferably an integer of 0 or greater, more preferably an integer of 1 or greater, and preferably an integer of 2 or less, more preferably an integer of 1 or less. n3 and n4 are each independently an integer from 0 to 4, preferably an integer of 1 or greater, more preferably an integer of 2 or greater, even more preferably an integer of 3 or greater, and preferably an integer of 4 or less.

[0027] (In formula (UV-2), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms, and R ２ , R ３２ , and R ４２ are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-, and n2, n3-1, and n4-1 are each independently an integer of 0 to 3.

[0028] R １１ , R ３１ and R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms, and the number of carbon atoms in the aliphatic hydrocarbon group is preferably 4 or more, more preferably 5 or more, and is preferably 9 or less, more preferably 8 or less, and even more preferably 7 or less. The aliphatic hydrocarbon group is preferably a straight-chain aliphatic hydrocarbon group, and more preferably a straight-chain alkyl group. The aliphatic hydrocarbon group is preferably a straight-chain aliphatic hydrocarbon group, and more preferably a straight-chain alkyl group, and is preferably a propyl group, a butyl group, a pentyl group, or a hexyl group, and more preferably a butyl group, a pentyl group, or a hexyl group.

[0029] R ２ , R ３２ , and R ４２are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-. ２ The preferred range of R in formula (UV-1) is ２ It is the same as R ３２ , and R ４２ The preferred ranges for n are each independently a hydroxyl group and an alkyl group having 1 to 3 carbon atoms, and more preferably a hydroxyl group and a methyl group. n2 is an integer of 0 to 3, preferably 1 or 2, and more preferably 1. n3-1 and n4-1 are each independently an integer of 0 to 3, preferably 1 or 2, and more preferably 2.

[0030] (In formula (UV-3), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms.

[0031] R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms, and the number of carbon atoms in the aliphatic hydrocarbon group is preferably 4 or more, more preferably 5 or more, and is preferably 9 or less, more preferably 8 or less, and even more preferably 7 or less. The aliphatic hydrocarbon group is preferably a straight-chain aliphatic hydrocarbon group, and more preferably a straight-chain alkyl group. The aliphatic hydrocarbon group is preferably a straight-chain aliphatic hydrocarbon group, and more preferably a straight-chain alkyl group, and is preferably a propyl group, a butyl group, a pentyl group, or a hexyl group, and more preferably a butyl group, a pentyl group, or a hexyl group.

[0032] Examples of triazine-based ultraviolet absorbers that can be used in this embodiment are listed below. It goes without saying that the ultraviolet absorbers that can be used in this embodiment are not limited to these.

[0033] In this embodiment, it is particularly preferable to use the following triazine-based ultraviolet absorbers.

[0034] The molecular weight of the triazine-based UV absorber used in this embodiment is preferably 400 or more, more preferably 500 or more, even more preferably 513 or more, even more preferably 550 or more, even more preferably 610 or more, even more preferably 650 or more, even more preferably 660 or more, and particularly preferably 680 or more. By setting the molecular weight of the triazine-based UV absorber to the above-mentioned lower limit or more, the triazine-based UV absorber becomes less likely to volatilize, and roll contamination can be more effectively suppressed. Furthermore, the molecular weight of the triazine-based UV absorber used in this embodiment is preferably 1,000 or less, more preferably 900 or less, and even more preferably 800 or less. By setting the molecular weight of the triazine-based UV absorber to the above-mentioned upper limit or less, compatibility with polycarbonate resins tends to be further improved. As a result, roll contamination during film formation tends to be effectively suppressed. When the film of the present embodiment contains two or more triazine-based ultraviolet absorbers, the molecular weight of the triazine-based ultraviolet absorber is the molecular weight of the triazine-based ultraviolet absorber with the smallest molecular weight.

[0035] The melting point of the triazine-based UV absorber used in this embodiment is preferably 180° C. or lower, more preferably 160° C. or lower, even more preferably 140° C. or lower, still more preferably 130° C. or lower, still more preferably 120° C. or lower, still more preferably 115° C. or lower, and may be 110° C. or lower. The lower limit of the melting point of the triazine-based UV absorber is preferably 90° C. or higher, more preferably 95° C. or higher, and even more preferably 100° C. or higher. When the film of this embodiment contains two or more triazine-based UV absorbers, the melting points of the triazine-based UV absorbers are the sum (weighted average) of the values ​​obtained by multiplying the melting points of the respective triazine-based UV absorbers by the mass fractions of the respective triazine-based UV absorbers.

[0036] The content of the triazine-based UV absorber in the film of this embodiment is preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, even more preferably 1.0 parts by mass or more, even more preferably 1.5 parts by mass or more, and even more preferably 1.8 parts by mass or more, relative to 100 parts by mass of the aromatic polycarbonate resin. By setting the content of the triazine-based UV absorber at or above the above-mentioned lower limit, the light transmittance of the film at a wavelength of 380 nm tends to be reduced. Furthermore, the upper limit of the content of the triazine-based UV absorber is preferably 3.0 parts by mass or less, more preferably 2.5 parts by mass or less, even more preferably 2.4 parts by mass or less, even more preferably 2.3 parts by mass or less, and even more preferably 2.2 parts by mass or less, relative to 100 parts by mass of the aromatic polycarbonate resin. By setting the content of the triazine-based UV absorber at or below the above-mentioned upper limit, color change of the film when heated tends to be more effectively suppressed.

[0037] The content of the triazine-based UV absorber in the film of this embodiment is preferably 0.3% by mass or more, more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, even more preferably 1.2% by mass or more, and even more preferably 1.5% by mass or more, relative to 100% by mass of the film. By setting the content of the triazine-based UV absorber to the above-mentioned lower limit or more, the film tends to have a lower light transmittance at a wavelength of 380 nm. Furthermore, the upper limit of the content of the triazine-based UV absorber is preferably 3.0% by mass or less, more preferably 2.5% by mass or less, even more preferably 2.4% by mass or less, even more preferably 2.3% by mass or less, and even more preferably 2.2% by mass or less, relative to 100% by mass of the film. By setting the content of the triazine-based UV absorber to the above-mentioned upper limit or less, the color change of the film when heated tends to be more effectively suppressed. The film of this embodiment may contain only one type of triazine-based UV absorber, or may contain two or more types of triazine-based UV absorbers. When two or more types are contained, the total amount is preferably within the above range.

[0038] <Specific wavelength absorbing dye having a maximum absorption wavelength in the wavelength range of 400 to 440 nm> In this embodiment, a specific wavelength absorbing dye (specific wavelength absorbing dye (C)) having a maximum absorption wavelength in the wavelength range of 400 to 440 nm is used. By using the specific wavelength absorbing dye (C), it is possible to fully exert the light absorbing function in the wavelength range of 400 to 440 nm even with a small amount added. Furthermore, since the blending amount can be reduced, color change when the film is heated can be effectively suppressed. In particular, the inventors have conducted studies and found that the above-mentioned effect is significantly exhibited with the specific wavelength absorbing dye (C).

[0039] The specific wavelength absorbing dye is a dye that selectively absorbs light in a specific wavelength region, and specific wavelength region dyes for various wavelength regions are commercially available from Nagase Vita Co., Ltd., Yamada Chemical Co., Ltd., Yamamoto Kasei Co., Ltd., Orient Chemical Co., Ltd., etc. The specific wavelength absorbing dye (C) used in this embodiment has a maximum absorption wavelength in the wavelength range of 400 to 440 nm, and the peak of the maximum absorption wavelength is preferably in a wavelength region of 410 nm or more, more preferably in a wavelength region of 415 nm or more, and preferably in a wavelength region of 430 nm or less, and more preferably in a wavelength region of 425 nm or less.

[0040] Examples of the specific wavelength absorbing dye (C) used in this embodiment are shown below. (1) A dye having a maximum absorption wavelength between 400 and 440 nm in its absorption spectrum. (2) A dye having a half-width of 50 nm or less in its absorption spectrum between 400 and 440 nm. The half-width is preferably 30 nm or less, and practically 10 nm or more. (3) A porphyrin dye having a maximum absorption wavelength between 400 and 440 nm. It is empirically known that any of these dyes can be used as the specific wavelength absorbing dye (C). (4) A dye that satisfies two or three of the above (1) to (3).

[0041] The absorption spectrum of the specific wavelength absorbing dye (C) is a value measured by dissolving the dye in chloroform solvent and using a spectrophotometer. The half-value width is a value calculated from the light transmittance curve measured according to the above method. A dye satisfying the above (1) to (3) tends to be less likely to discolor at the molding temperature of an aromatic polycarbonate resin, and tends to be able to effectively suppress color change.

[0042] The specific wavelength absorbing dye (C) may be either a dye or a pigment, but is usually a pigment.

[0043] The content (concentration) of the specific wavelength absorbing dye (C) in the film of this embodiment is preferably 2 ppm by mass or more, more preferably 4 ppm by mass or more, even more preferably 6 ppm by mass or more, even more preferably 8 ppm by mass or more, and even more preferably 10 ppm by mass or more, relative to 100 parts by mass of the aromatic polycarbonate resin. It is also preferably 50 ppm by mass or less, more preferably 40 ppm by mass or less, even more preferably 30 ppm by mass or less, even more preferably 20 ppm by mass or less, and even more preferably 15 ppm by mass or less. By setting the content of the specific wavelength absorbing dye (C) to the above-mentioned lower limit or more, light with a wavelength of 400 to 440 nm tends to be effectively blocked. Furthermore, by setting the content to the above-mentioned upper limit or less, light with wavelengths other than the target wavelength tends to be effectively blocked. The film of this embodiment may contain only one type of specific wavelength absorbing dye (C), or may contain two or more types. When two or more types are contained, the total amount preferably falls within the above-mentioned range.

[0044] In the film of this embodiment, the mass ratio of the triazine-based ultraviolet absorber to the specific wavelength absorbing dye (C) (triazine-based ultraviolet absorber / specific wavelength absorbing dye (C)) is preferably 0.10 or more, more preferably 0.12 or more, and even more preferably 0.14 or more, and is preferably 0.30 or less, more preferably 0.27 or less, more preferably 0.25 or less, even more preferably 0.24 or less, even more preferably 0.20 or less, and even more preferably 0.18 or less. By setting this mass ratio to the above lower limit or more, light in the ultraviolet region tends to be effectively blocked. Furthermore, by setting this mass ratio to the above upper limit or less, roll contamination during molding tends to be effectively suppressed and improved.

[0045] <Other Components> The film of this embodiment may or may not contain other components besides the aromatic polycarbonate resin, triazine-based ultraviolet absorber, and specific wavelength absorbing dye (C). Examples of other components include antioxidants, release agents, heat stabilizers, flame retardants, flame retardant aids, colorants other than those mentioned above, antistatic agents, fluorescent brighteners, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, sliding improvers, hue improvers, acid trapping agents, etc. In addition, the film of this embodiment may contain additives described in paragraphs 0047 to 0103 of WO 2021 / 241471 within the scope of the present invention, the contents of which are incorporated herein by reference. When other components are contained, the total content thereof is preferably 0.001 to 3% by mass of the film, more preferably 2% by mass or less, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.1% by mass or less, and may be less than 0.01% by mass. Only one type of other component may be contained, or two or more types may be contained. When two or more types of other components are contained, it is preferable that the total amount is in the above range.

[0046] The film of the present embodiment may be configured to be substantially free of triazine-based ultraviolet absorbers other than the compound represented by formula (UV-3). "Substantially free" means that the content of triazine-based ultraviolet absorbers other than the compound represented by formula (UV-3) contained in the film is less than 1% by mass, and preferably less than 0.1% by mass, of the content of the compound represented by formula (UV-3) contained in the film.

[0047] The film of this embodiment may or may not contain an ultraviolet absorber other than a triazine-based ultraviolet absorber. In a first embodiment of this embodiment, the film is substantially free of ultraviolet absorbers other than triazine-based ultraviolet absorbers. "Substantially free" means that the content of ultraviolet absorbers other than triazine-based ultraviolet absorbers is less than 1% by mass, preferably less than 0.1% by mass, of the content of triazine-based ultraviolet absorbers contained in the film. In a second embodiment of this embodiment, the film is substantially free of benzotriazole-based ultraviolet absorbers. "Substantially free" means that the content of benzotriazole-based ultraviolet absorbers contained in the film is less than 1% by mass, preferably less than 0.1% by mass, of the content of triazine-based ultraviolet absorbers contained in the film. In a third embodiment of this embodiment, the film contains both a triazine-based ultraviolet absorber and a benzotriazole-based ultraviolet absorber. In the third embodiment, the benzotriazole-based UV absorber is preferably contained in an amount of 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more, per 1 part by mass of the triazine-based UV absorber, and is preferably contained in an amount of 6.5 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 8 parts by mass or less. In the third embodiment, only one type of benzotriazole-based UV absorber may be used, or two or more types may be used. When two or more types are used, it is preferable that the total amount is within the above range. For benzotriazole-based UV absorbers, the description in paragraphs 0023 to 0025 of JP-A-2023-025384 can be referred to, and the contents thereof are incorporated herein by reference.

[0048] The film of this embodiment may or may not contain a visible light absorber other than the triazine-based UV absorber and the specific wavelength absorbing dye (C). The film of this embodiment may also be configured to be substantially free of visible light absorbers other than the triazine-based UV absorber and the specific wavelength absorbing dye (C). Specifically, the content of the visible light absorber other than the triazine-based UV absorber and the specific wavelength absorbing dye (C) is preferably less than 0.01% by mass, more preferably less than 0.001% by mass, of the total content of the triazine-based UV absorber and the specific wavelength absorbing dye (C) contained in this embodiment. The film of this embodiment may also be configured to be substantially free of a benzotriazole-based UV absorber. Specifically, the content of the benzotriazole-based UV absorber is preferably less than 0.01% by mass, more preferably less than 0.001% by mass, of the total content of the triazine-based UV absorber and the specific wavelength absorbing dye (C) contained in this embodiment. The film of this embodiment may also be configured to be substantially free of a black pigment (and further, a black colorant). Specifically, the content of the black pigment is preferably less than 0.01 mass %, more preferably less than 0.001 mass %, of the total content of the triazine-based ultraviolet absorber and the specific wavelength absorbing dye (C) contained in this embodiment. The film of this embodiment can also be configured to be substantially free of a yellow dye (and further, a yellow colorant). Specifically, the content of the yellow dye is preferably less than 0.01 mass %, more preferably less than 0.001 mass %, of the total content of the triazine-based ultraviolet absorber and the specific wavelength absorbing dye (C) contained in this embodiment.

[0049] <Film Thickness> The film of this embodiment preferably has a thickness of 200 to 500 μm. By making the thickness of the film equal to or greater than the above-mentioned lower limit, the film's light transmittance at wavelengths of 420 nm or less tends to be reduced. By making the thickness of the film equal to or less than the above-mentioned upper limit, the heat bending processability tends to be improved. The thickness of the film is preferably equal to or greater than 250 μm, more preferably equal to or greater than 280 μm, and is preferably equal to or less than 550 μm, more preferably equal to or less than 510 μm, even more preferably equal to or less than 500 μm, even more preferably equal to or less than 450 μm, even more preferably equal to or less than 400 μm, and even more preferably equal to or less than 350 μm.

[0050] <Film Light Transmittance> The film of this embodiment preferably has low light transmittance in the 380 nm to 420 nm wavelength range. The film of this embodiment preferably has a light transmittance of less than 15% at a wavelength of 420 nm. While the lower limit of the light transmittance of the film of this embodiment at a wavelength of 420 nm is not particularly specified, a value of 0.1% or more is practical, and even 1% or more sufficiently satisfies the required performance. The film of this embodiment has a light transmittance of less than 15%, preferably 3% or less, more preferably 2% or less, even more preferably 1% or less, even more preferably 0.6% or less, and even more preferably less than 0.1%. Although the lower limit of the light transmittance of the film of this embodiment at a wavelength of 380 nm is not particularly specified, a value greater than 0% is practical. A film satisfying the above-described light transmittance can be achieved by blending a triazine-based ultraviolet absorber and a specific wavelength absorbing dye (C) with an aromatic polycarbonate resin as the ultraviolet absorber and dye.

[0051] <Rolled Body> The film of the present embodiment can be wound around a core material to form a rolled body.

[0052] <Polarizing Sheet> The film of this embodiment is preferably used in a polarizing sheet. In this embodiment, the polarizing sheet includes the film of this embodiment and a polarizing film. More specifically, the polarizing sheet is a sheet in which the film of this embodiment, a polarizing film, and a polarizing film substrate are laminated in this order. That is, the film of this embodiment is preferably used as at least one of the polarizing film substrates of a polarizing sheet. In this embodiment, one polarizing film substrate of the polarizing sheet is the film of this embodiment, and the other polarizing film substrate of the polarizing sheet can be a polarizing film substrate of a known polarizing sheet, which may be the same as the film of this embodiment. Known polarizing films can be used, and examples thereof include polyvinyl alcohol (PVA) films in which iodine or a dichroic organic dye is adsorbed or impregnated. The polarizing film substrate is usually bonded to the polarizing film via an adhesive. Known adhesives can be used to bond the film / polarizing film substrate of this embodiment to the polarizing film, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, and polyvinyl alcohol adhesives. Among these, urethane adhesives are preferred. The thickness of the adhesive is usually 1 μm or more and usually 30 μm or less. The polarizing sheet of this embodiment may further include a masking film or the like on the outer side of the polarizing film substrate.

[0053] In this embodiment, the polarizing sheet of this embodiment is preferably used for a heat-bent molded article that has been subjected to heat bending processing.

[0054] When the film of this embodiment is used in a polarizing sheet, the film of this embodiment may be provided on either side of the polarizing film, or on both sides. In a first embodiment, the film of this embodiment is arranged so that it is located on the concave side of the polarizing film after heat bending, for example, on the side of the polarizing film substrate 3 in FIG. 1 . In a second embodiment, the film of this embodiment is arranged so that it is located on the convex side of the polarizing film after heat bending, for example, on the side of the polarizing film substrate 4 in FIG. 1 . In a third embodiment, the film of this embodiment is arranged so that it is located on both sides of the polarizing film, for example, both the polarizing film substrates 3 and 4 in FIG. 1 are films of this embodiment. While the lens 1, polarizing film 2, and polarizing film substrates 3 and 4 of the polarizing sheet are bent in FIG. 1 , it goes without saying that a case in which no bending is performed is also included in this embodiment.

[0055] In this embodiment, the polarizing sheet is preferably used as a polarizing sheet for use in liquid crystal display devices, polarizing lenses (sunglasses lenses, ski goggles, prescription eyeglass lenses, camera viewfinder lenses), various instrument covers, automobile glass, train glass, polarizing sheets for in-vehicle display panels and electronic device housings, etc., in-vehicle inner mirrors, silver mirrors for helmets, etc. In particular, the polarizing sheet of this embodiment is preferably used for sunglasses.

[0056] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or the like, measurements can be made using other instruments with equivalent performance.

[0057] 1. Raw materials A1: Bisphenol A polycarbonate resin, manufactured by Mitsubishi Gas Chemical Company, Inc., S-3000 B1: Triazine-based ultraviolet absorber, manufactured by ADEKA Corporation, LA-F70 B2: Non-triazine ultraviolet absorber, LA-31, manufactured by ADEKA Corporation

[0058] C1: specific wavelength absorption dye (C), maximum absorption wavelength is 420 nm, FDB-001, porphyrin dye, half width is 25 nm, manufactured by Yamada Chemical Industry Co., Ltd. D1: yellow dye, 8000, manufactured by Arimoto Chemical Industry Co., Ltd., maximum absorption wavelength is 404 nm, D2: yellow dye, 8005, manufactured by Arimoto Chemical Industry Co., Ltd., maximum absorption wavelengths are 422 nm and 447 nm

[0059] Example 1 and Comparative Examples 1 to 7 <Film Production> Polycarbonate resin films were produced by the following method. Each component listed in Table 1 was weighed out to the amount listed in Table 1 (Table 1 shows the amounts in parts by mass, except that the amount of the specific wavelength absorbing dye (C) is ppm by mass). After mixing for 15 minutes in a tumbler, the mixture was extruded into a molten state using a T-die melt extruder consisting of a vented twin-screw segment extruder (manufactured by Toyo Seiki Seisaku-sho, Ltd., "2D30W2") with a barrel diameter of 25 mm and a screw L / D of 30 at a discharge rate of 8 kg / h and a screw rotation speed of 100 rpm. The mixture was then cooled and solidified only by the first roll of a film / sheet take-up device (manufactured by Toyo Seiki Seisaku-sho, Ltd., "FT3W20") to produce a polycarbonate resin film. The cylinder / die head temperature was 280°C, and the roll temperature was 130°C. The final film thickness was adjusted by changing the roll speed of the first roll to obtain the thickness listed in Table 1.

[0060] <Light transmittance> The light transmittance of the obtained film at wavelengths of 420 nm and 380 nm was measured. Specifically, the light transmittance (unit: %) was measured using a spectrophotometer at a scan speed of 300 nm / min and a sampling interval of 1 nm. The spectrophotometer U-4100 (manufactured by Hitachi High-Technologies Corporation) was used for the measurement. The light transmittance at 420 nm was evaluated according to the following classification: <<Transmittance at 420 nm>> A: Less than 15% B: 15% or more but less than 50% C: 50% or more

[0061] <<Light Transmittance of Polarizing Sheet>> The light transmittance at a wavelength of 420 nm of the resulting multilayer body formed by stacking two films was measured. The results are shown in Table 1.

[0062] <Roll Contamination> The rolls used in the production of the film were visually inspected for contamination. The inspection for the presence or absence of contamination was carried out by five experts, who judged by majority vote according to the following criteria: A: No roll contamination was observed B: Roll contamination was observed

[0063] <Color Change> The hue of the multilayer body obtained by stacking two films was measured. It was evaluated as the color change (ΔE) relative to the multilayer body using the film of Comparative Example 1. The hue was measured using a spectrophotometer in accordance with JIS Z 8722 under illumination and light receiving conditions of di: 0° post-spectroscopic method. The spectrophotometer used was a "V-760" manufactured by JASCO Corporation.

[0064] <Heat Resistance> The heat resistance of the obtained film was evaluated. Specifically, the multilayer body was heated at 120°C for 100 hours, and the color change before and after heating was measured. The color change was evaluated as ΔE before and after heating. ΔE was measured using a spectrophotometer in accordance with JIS Z 8722 under illumination and light receiving conditions of di: 0° post-spectrophotometric method. The spectrophotometer used was "SD-7000" manufactured by Nippon Denshoku Industries Co., Ltd.

[0065]

[0066] In Table 1 above, the transmittance at 420 nm, the transmittance at 380 nm, the heat resistance and the roll staining are evaluations of the film alone, and the color change and the transmittance at 420 nm are evaluations of a multilayer body consisting of two films stacked together.

[0067] Among the values ​​shown in the "Transmittance at 380 nm" column, "<0.1" indicates that the light transmittance at a wavelength of 380 nm was less than 0.1%. It was found that the film of this embodiment can adequately block light rays with wavelengths of 380 nm to 420 nm. It was also found that the film of this embodiment can block light rays with a wavelength of 420 nm even when formed into a multilayer body. The film of this embodiment was able to effectively suppress roll contamination during production. Despite the incorporation of an ultraviolet absorber and a dye, the film of this embodiment showed little color change when formed into a multilayer body. Despite the incorporation of an ultraviolet absorber and a dye, the film of this embodiment showed little heat resistance (color change) when formed into a multilayer body. Comparative Example 6 is an example in which an ultraviolet absorber other than a triazine-based ultraviolet absorber was used, and the ultraviolet absorber was incorporated to a level that satisfied the light transmittance at a wavelength of 420 nm, satisfying the evaluation "A." As a result, heat resistance was poor and roll contamination occurred. On the other hand, in Comparative Example 7, the amount of the ultraviolet absorber in Comparative Example 6 was changed to the same amount as in Example 1, and the light transmittance at a wavelength of 420 nm was high.

[0068] Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.

[0069] 1 Lens 2 Polarizing film 3 Polarizing film substrate 4 Polarizing film substrate

Claims

1. A film comprising an aromatic polycarbonate resin, an ultraviolet absorber having a triazine structure, and a specific wavelength absorbing dye having a maximum absorption wavelength between 400 and 440 nm.

2. The film according to claim 1, wherein the thickness of the film is 200 to 500 μm.

3. The film according to claim 1 or 2, wherein the concentration of the specific wavelength absorbing dye having a maximum absorption wavelength in the wavelength range of 400 to 440 nm is 2 to 50 ppm by mass per 100 parts by mass of the aromatic polycarbonate resin.

4. The film according to claim 1 or 2, wherein the ultraviolet absorber having a triazine structure includes a compound represented by formula (UV-1). (In formula (UV-1), R １ is a hydrocarbon group having 1 to 10 carbon atoms or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and —O— and / or —C(═O)—, and R ２ ~R ４ are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-, n2 is an integer of 0 to 3, and n3 and n4 are each independently an integer of 0 to 4.

5. The film according to claim 4, wherein n3 and n4 each independently represent an integer of 1 to 4.

6. The film according to claim 1 or 2, wherein the ultraviolet absorber having a triazine structure includes a compound represented by formula (UV-2). (In formula (UV-2), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms, and R ２ , R ３２ , and R ４２ are each independently a hydroxyl group, a hydrocarbon group having 1 to 10 carbon atoms, or a group consisting of a combination of a hydrocarbon group having 1 to 10 carbon atoms and -O- and / or -C(=O)-, and n2, n3-1, and n4-1 are each independently an integer of 0 to 3.

7. The film according to claim 1 or 2, wherein the ultraviolet absorber having a triazine structure includes a compound represented by formula (UV-3). (In formula (UV-3), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms.

8. The film according to claim 1 or 2, wherein the film has a light transmittance of less than 15% at a wavelength of 420 nm.

9. The film according to claim 1 or 2, wherein the film has a light transmittance of less than 15% at a wavelength of 380 nm.

10. The film according to claim 1 or 2, wherein the content of aromatic polycarbonate resin in the film is 85% by mass or more based on 100% by mass of the film.

11. The film according to claim 1 or 2, wherein the content of the ultraviolet absorber having a triazine structure in the film is 0.3% by mass or more and 3.0% by mass or less, based on 100% by mass of the film.

12. The film according to claim 1 or 2, wherein the mass ratio of the ultraviolet absorber having a triazine structure to the specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm (ultraviolet absorber having a triazine structure / specific wavelength absorbing dye having an absorption maximum in the wavelength range of 400 to 440 nm) in the film is 0.10 or more and 0.30 or less.

13. The film according to claim 1 or 2, wherein the specific wavelength absorbing dye having a maximum absorption wavelength in the wavelength range of 400 to 440 nm includes a porphyrin dye having a maximum absorption wavelength in the wavelength range of 400 to 440 nm.

14. The film according to claim 1 or 2, wherein the specific wavelength absorption dye having a maximum absorption wavelength in the wavelength range of 400 to 440 nm includes a dye whose half-width of the absorption spectrum in the wavelength range of 400 to 440 nm is 50 nm or less.

15. The thickness of the film is 200 to 500 μm, the concentration of the specific wavelength absorbing dye having a maximum absorption wavelength between 400 and 440 nm is 2 to 50 mass ppm relative to 100 mass parts of the aromatic polycarbonate resin, the ultraviolet absorber having a triazine structure contains a compound represented by formula (UV-3), the light transmittance of the film at a wavelength of 420 nm is less than 15%, and the light transmittance of the film at a wavelength of 380 nm is 3% or less, the content of the aromatic polycarbonate resin in the film is 85 mass% or more relative to 100 mass% of the film, and the content of the ultraviolet absorber having a triazine structure in the film is 0.3 mass% or more and 3.0 mass% or less relative to 100 mass% of the film, 2. The film according to claim 1, wherein a mass ratio of the ultraviolet absorber having a triazine structure to the specific wavelength absorbing dye having an absorption maximum in a wavelength range of 400 to 440 nm (ultraviolet absorber having a triazine structure / specific wavelength absorbing dye having an absorption maximum in a wavelength range of 400 to 440 nm) in the film is 0.10 or more and 0.30 or less, the specific wavelength absorbing dye having an absorption maximum in a wavelength range of 400 to 440 nm includes a porphyrin dye having an absorption maximum in a wavelength range of 400 to 440 nm, and the specific wavelength absorbing dye having an absorption maximum in a wavelength range of 400 to 440 nm includes a dye whose absorption spectrum has a half-width of 50 nm or less in a wavelength range of 400 to 440 nm. (In formula (UV-3), R １１ and R ３１ , R ４１ are each independently an aliphatic hydrocarbon group having 3 to 10 carbon atoms.

16. A polarizing sheet comprising the film according to any one of claims 1, 2 and 15 and a polarizing membrane.

17. A heat-bent product of the polarizing sheet according to claim 16.

18. Sunglasses having the polarizing sheet according to claim 16.

Images