JP2024172686A - Polarizing sheets and optical components - Google Patents

Abstract

To provide a polarizing sheet which accurately suppress or prevent contamination of a mold used in manufacture of an optical component by attachment of an additive contained in the obtained optical component to the mold at the time of manufacture of the mold, especially, contamination of the mold based on attachment of an ultraviolet absorber which is contained as the additive and has an inflection point in a long wavelength region of 380 nm or more and 440 nm or less in an optical absorption spectrum, and enables manufacture of the optical component, and the optical component which has the polarizing sheet and is excellent in reliability.SOLUTION: A polarizing sheet 15 includes a polarizing film 13, a first resin layer 11 and a second resin layer 12, wherein the first resin layer 11 and the second resin layer 12 each independently contain a resin material and an additive, at least the first resin layer 11 out of the first resin layer 11 and the second resin layer 12 contains an ultraviolet absorber having an inflection point in a wavelength region of 380 nm or more and 440 nm or less in an optical absorption spectrum, as the additive.SELECTED DRAWING: Figure 3

Description

The present invention relates to a polarizing sheet and an optical component.

As an example of an optical component that includes a polarizing sheet (resin substrate) in which both sides of a polarizing film are covered with a coating layer mainly made of polycarbonate resin or polyamide resin, a lens for glasses has been proposed.

For example, this eyeglass lens is produced by punching out a polarizing sheet (polarizing laminate) that is flat in plan view into a predetermined shape, such as a circle in plan view, with protective films attached to both sides of the polarizing sheet. The polarizing sheet is then subjected to a thermal bending process under heating to form a curved polarizing sheet that is curved by thermal bending. After the protective film is peeled off from the curved polarizing sheet, the curved polarizing sheet is adsorbed onto a mold having a curved recess such that the recess of the mold and the protruding portion of the curved polarizing sheet are in contact with each other, and a resin layer made of a resin composition containing a resin material such as a polycarbonate resin or a polyamide resin as a main material is formed on the concave surface of the curved polarizing sheet by insert injection molding (see, for example, Patent Document 1).

In such a manufacturing method for eyeglass lenses, when molding the resin layer using the insert injection molding method, the resin composition that constitutes the resin layer needs to be injected into a mold. Therefore, if the resin composition contains additives such as ultraviolet absorbers in addition to the resin material, there is a problem that the inside of the mold is contaminated by these additives.

Furthermore, when the ultraviolet absorber used as an additive contains an ultraviolet absorber that has an inflection point in the long wavelength region of 380 nm or more and 440 nm or less in the light absorption spectrum of the ultraviolet absorber, such ultraviolet absorbers are very rare, so there is a demand to minimize mold contamination caused by exposure of the ultraviolet absorber from the resin composition.

JP 2009-294445 A

The object of the present invention is to provide a polarizing sheet capable of manufacturing optical parts by accurately suppressing or preventing contamination of the mold caused by the adhesion of additives contained in the resulting optical parts during the manufacturing process, particularly contamination of the mold caused by the adhesion of an ultraviolet absorber contained as an additive and having an inflection point in the long wavelength region of 380 nm or more and 440 nm or less in the light absorption spectrum, and to provide optical parts having excellent reliability that are equipped with such a polarizing sheet.

Such an object can be achieved by the present invention described in (1) to (9) below.
(1) A polarizing sheet comprising a polarizing film, a first resin layer provided on one surface of the polarizing film, and a second resin layer provided on the other surface of the polarizing film,
The first resin layer and the second resin layer each independently contain a resin material and an additive,
a polarizing sheet, wherein of the first resin layer and the second resin layer, at least the first resin layer contains, as the additive, an ultraviolet absorber having an inflection point in a wavelength range of 380 nm or more and 440 nm or less in a light absorption spectrum of the additive.

(2) The polarizing sheet according to (1) above, wherein the ultraviolet absorber includes at least one of an ultraviolet absorber having an inflection point in the wavelength range of 380 nm or more and 410 nm or less in the light absorption spectrum of the ultraviolet absorber, and an ultraviolet absorber having an inflection point in the wavelength range of more than 410 nm and 440 nm or less.

(3) The polarizing sheet according to (1) or (2) above, which has a region in its light absorption spectrum that satisfies that the light transmittance in the wavelength range of 390 nm or more and 420 nm or less is 7.0% or less.

(4) The polarizing sheet according to any one of (1) to (3) above, which is used in a curved state with the one surface being a curved concave surface and the other surface being a curved convex surface.

(5) The polarizing sheet according to any one of (1) to (4) above, wherein the first resin layer and the second resin layer each independently have an average thickness of 0.15 mm or more and 2.00 mm or less.

(6) The polarizing sheet according to any one of (1) to (5) above, wherein the first resin layer and the second resin layer each independently have an additive content of 0.10% by weight or more and 3.00% by weight or less.

(7) The polarizing sheet according to any one of (1) to (6) above, wherein the first resin layer and the second resin layer are each independently composed mainly of a polycarbonate-based resin or a polyamide-based resin as the resin material.

(8) A polarizing sheet according to any one of (1) to (7) above, wherein the glass transition point of the resin material is 100°C or higher and 190°C or lower.

(9) a substrate;
An optical component comprising: a polarizing sheet according to any one of (1) to (8) above, laminated on the base material.

According to the present invention, when an optical component, for example, a lens for glasses, is manufactured by insert injection molding, that is, when a resin layer is formed on a curved concave surface formed by curving a polarizing sheet, the additive contained in the resulting lens for glasses (optical component) can be appropriately suppressed from adhering to the mold used in the insert injection molding. In particular, it is possible to appropriately suppress or prevent contamination of the mold caused by the adhesion of an ultraviolet absorber contained as an additive and having an inflection point in the long wavelength region of 380 nm to 440 nm or less in the light absorption spectrum. Therefore, since contamination of the mold caused by the adhesion of the additive can be appropriately suppressed or prevented, a lens for glasses (optical component) with excellent reliability can be manufactured.

FIG. 1 is a perspective view showing an embodiment of sunglasses equipped with eyeglass lenses as an optical component having a polarizing sheet of the present invention. FIG. 2 is a schematic diagram illustrating a method for producing a spectacle lens as an optical component using the polarizing sheet of the present invention. 1 is a vertical cross-sectional view showing an embodiment of a polarizing sheet of the present invention. 4 is a longitudinal sectional view showing a curved polarizing sheet in which the polarizing sheet shown in FIG. 3 is curved. FIG.

The polarizing sheet and optical component of the present invention will be described in detail below based on the preferred embodiments shown in the attached drawings.

The polarizing sheet 15 of the present invention comprises a polarizing film 13, a first resin layer 11 provided on one side of the polarizing film 13, and a second resin layer 12 provided on the other side of the polarizing film 13. The first resin layer 11 and the second resin layer 12 each independently contain a resin material and an additive. Of the first resin layer 11 and the second resin layer 12, at least the first resin layer 11 contains, as an additive, an ultraviolet absorber whose light absorption spectrum has an inflection point in the wavelength range of 380 nm or more and 440 nm or less.

As a result, when manufacturing an optical component, for example, a spectacle lens 30 by the insert injection molding method, that is, when forming a resin layer 35 on the curved concave surface formed by making the polarizing sheet 15 into a curved shape, it is possible to accurately suppress contamination of the mold 40 used in the insert injection molding method due to the additive contained in the resulting spectacle lens 30 (optical component) adhering to the mold 40. In particular, it is possible to accurately suppress or prevent contamination of the mold 40 due to the adhesion of the ultraviolet absorber contained as an additive and having an inflection point in the wavelength range of 380 nm to 440 nm. Therefore, since contamination of the mold 40 due to the adhesion of the additive can be accurately suppressed or prevented, a highly reliable spectacle lens 30 (optical component) can be manufactured.

The polarizing sheet 15 of the present invention is used, for example, as a polarizing resin substrate of an eyeglass lens 30 included in sunglasses 100, a type of eyeglasses. Therefore, before describing the polarizing sheet 15 of the present invention, the sunglasses 100 including this eyeglass lens 30 (the optical component of the present invention) will be described below.

<Sunglasses>
Fig. 1 is a perspective view showing an embodiment of sunglasses equipped with eyeglass lenses as an optical component having a polarizing sheet of the present invention. In Fig. 1, when the sunglasses are worn on the head of a user, the surface of the lens facing the user's eyes is referred to as the back surface, and the opposite surface is referred to as the front surface.

As shown in FIG. 1, the sunglasses 100 include a frame 20 and eyeglass lenses 30.

In this specification, "spectacle lenses" refers to optical components that have polarizing properties, and includes both those that have a light-collecting function and those that do not.

The frame 20 is worn on the user's head and positions the eyeglass lenses 30 near the front of the user's eyes.

The frame 20 has a rim portion 21, a bridge portion 22, a temple portion 23, and a nose pad portion 24.

The rim portion 21 is ring-shaped, with one for each right eye and one for each left eye, and the eyeglass lens 30 is attached to the inside. This allows the user to view external information through the eyeglass lens 30.

The bridge portion 22 is rod-shaped and is positioned in front of the top of the user's nose when the headset is worn on the user's head, connecting the pair of rim portions 21.

The temples 23 are vine-shaped and are connected to the edge of each rim 21 on the opposite side to where the bridges 22 are connected. The temples 23 are placed over the user's ears when the glasses are worn on the user's head.

When the sunglasses 100 are worn on the head of the user, the nose pads 24 are provided on the edges of the rims 21 that correspond to the nose of the user, come into contact with the nose, and are shaped to correspond to the contact area of the nose. This allows the sunglasses 100 to be stably maintained when worn.

The materials that make up the frame 20 are not particularly limited, and may be, for example, various metal materials or various resin materials. The shape of the frame 20 is not limited to the one shown in the figure, as long as it can be worn on the user's head.

The eyeglass lens 30 is attached to each rim portion 21. The eyeglass lens 30 is a light-transmitting, plate-shaped member that is curved toward the outside, and has a resin layer 35 and a curved polarizing sheet 10.

The resin layer 35 is optically transparent and is located on the back side of the lens. When the spectacle lens 30 is given a light-collecting function, this resin layer 35 has the light-collecting function.

The resin layer 35 is composed of a resin composition having optical transparency, which contains a resin material as the main material. The constituent material is not particularly limited as long as it is an optically transparent resin material, but examples include various thermoplastic resins, thermosetting resins, and various curable resins such as photocurable resins, and one or more of these can be used in combination.

In this specification, the term "main material" refers to a material that is contained in an amount of 50% by weight or more among the multiple constituent materials contained in a layer (resin composition).

Examples of resin materials include polyolefins such as polyethylene, polypropylene, and ethylene-propylene copolymers, polyvinyl chloride, polystyrene, polyamide, polyimide, polycarbonate, poly-(4-methylpentene-1), ionomers, acrylic resins, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymers (ABS resins), acrylonitrile-styrene copolymers (AS resins), butadiene-styrene copolymers, polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyethers, polyether ketones (PEK), and polyether ethers. Examples of the resin include polyether ether ketone (PEEK), polyetherimide, polyacetal (POM), polyphenylene oxide, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, aromatic polyester (liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride, other fluorine-based resins, epoxy resins, phenolic resins, urea resins, melamine resins, silicone resins, polyurethanes, etc., or copolymers, blends, polymer alloys, etc. that are mainly made of these. Among these, it is preferable that the resin layer 35 is the same or identical to the resin material that constitutes the first resin layer 11 of the curved polarizing sheet 10 described later. This can improve the adhesion between the resin layer 35 and the curved polarizing sheet 10.

The thickness of the resin layer 35 is not particularly limited, but is preferably, for example, 0.5 mm or more and 5.0 mm or less, and more preferably 1.0 mm or more and 3.0 mm or less. This allows the eyeglass lens 30 to achieve both relatively high strength and light weight.

In the resin layer 35 having such a configuration, in the present invention, the resin composition constituting the resin layer 35 does not contain additives such as ultraviolet absorbers, or if it does contain them, the content of the additives can be set low. Therefore, when manufacturing the eyeglass lens 30 by the insert injection molding method, the additives contained in the resulting eyeglass lens 30 (optical component) can be appropriately suppressed from adhering to the mold 40 used in the insert injection molding method, but a detailed explanation of this will be given later.

In addition, when the resin layer 35 (resin composition) contains an additive such as an ultraviolet absorber, the additive can be the same as the additive contained in the first resin layer 11 described below.

The curved polarizing sheet 10 is a curved resin substrate that is bonded to the outer surface of the resin layer 35, i.e., the curved convex surface, in a curved shape corresponding to the shape, thereby imparting polarization to the sunglasses 100. As a result, the sunglasses 100 function as polarized sunglasses with polarization. The curved polarizing sheet 10 is composed of a polarizing sheet 15 (the polarizing sheet of the present invention) that has been curved, but a detailed explanation of this will be given later.

As mentioned above, the eyeglass lens 30 of the sunglasses 100 may or may not have a light-gathering function.

As described above, the sunglasses 100 may have a frame 20, or may be frameless from the standpoint of fashionability, lightweight, etc.

Furthermore, in this embodiment, glasses equipped with the glasses lens 30 are applied to sunglasses 100, but this is not limited to this, and the glasses may be, for example, prescription glasses, fashion glasses, goggles that protect the eyes from wind, rain, dust, chemicals, etc.

In the sunglasses 100 configured as described above, the eyeglass lenses 30 included in the sunglasses 100 are manufactured in the present invention by the eyeglass lens 30 manufacturing method described below, so that the polarizing sheet 15 is curved and includes a curved polarizing sheet 10.

<Method of manufacturing eyeglass lenses>
2 is a schematic diagram for explaining a method for producing a spectacle lens using the polarizing sheet of the present invention. For convenience of explanation, the upper side of FIG. 1 will be referred to as "upper" and the lower side as "lower".

Hereinafter, each step of the method for manufacturing the eyeglass lens 30 including the curved polarizing sheet 10 in which the polarizing sheet 15 (the polarizing sheet of the present invention) is curved will be described in detail.
[1] First, a polarizing sheet 15 (polarizing laminate) is prepared, which is a flat plate-like structure including a first resin layer 11, a polarizing film 13, and a second resin layer 12 laminated in this order. Protective films 50 (masking films) are attached to both sides of the polarizing sheet 15, to obtain a multilayer laminate 150 in which the protective films 50 are attached to both sides of the polarizing sheet 15 (see FIG. 2(a)).

[2] Next, as shown in FIG. 2(b), the prepared multilayer laminate 150, i.e., the polarizing sheet 15 with the protective films 50 attached to both sides of the polarizing sheet 15, is punched out in its thickness direction to give the multilayer laminate 150 a circular shape in plan view.

[3] Next, as shown in FIG. 2(c), the circular multilayer laminate 150 is subjected to a thermal bending process under heating to form the multilayer laminate 150 into a curved multilayer laminate 200 having a curved shape with the first resin layer 11 side being a curved concave surface and the second resin layer 12 side being a curved convex surface. This makes it possible to form the flat polarizing sheet 15 into a curved polarizing sheet 10 having a curved shape with the protective films 50 attached to both sides.

This heat bending is usually carried out by press forming or vacuum forming.
As described above, in this embodiment, the heating temperature (molding temperature) of the multilayer laminate 150 (polarizing sheet 15) at this time is set to about 110° C. or more and 170° C. or less, more preferably about 140° C. or more and 160° C. or less, taking into consideration the melting or softening temperatures of the resin layers 11 and 12, since the polarizing sheet 15 includes the resin layers 11 and 12. By setting the heating temperature within this range, it is possible to prevent the polarizing sheet 15 from being altered or deteriorated, bring the polarizing sheet 15 into a softened or molten state, and reliably heat-bend the polarizing sheet 15 to form the curved polarizing sheet 10 having a curved shape.

[4] Next, the protective film 50 is peeled off from the thermally bent curved polarizing sheet 10. Thereafter, as shown in FIG. 2(d), the curved polarizing sheet 10 is adsorbed to a mold 40 having a curved concave surface with a curved shape, with the curved concave surface of the mold 40 abutting against the curved convex surface of the curved polarizing sheet 10. Then, using an insert injection molding method, a resin layer 35 made of a resin composition mainly made of a resin material is injection molded on the curved concave surface of the curved polarizing sheet 10. This produces a spectacle lens 30 including the curved polarizing sheet 10 with the polarizing sheet 15 thermally bent and the resin layer 35.

Among the insert injection molding methods, the injection compression molding method is preferably used. The injection compression molding method involves injecting the resin composition for forming the resin layer 35 into the mold 40 at low pressure, then closing the mold 40 at high pressure to apply a compressive force to the resin composition. This is preferably used because the resin layer 35 as the molded body, and thus the eyeglass lens 30, is less likely to suffer from molding distortion or optical anisotropy due to the local orientation of the resin molecules during molding. In addition, by controlling the mold compression force that is uniformly applied to the resin composition, the resin composition can be cooled at a constant specific volume, so that a resin layer 35 with high dimensional accuracy can be obtained.

In the above-described manufacturing method of the eyeglass lens 30, the polarizing sheet of the present invention is used as the polarizing sheet 15 used to form the curved polarizing sheet 10 that the eyeglass lens 30 is equipped with. As a result, when the eyeglass lens 30 equipped with the curved polarizing sheet 10 and the resin layer 35 is obtained by the insert injection molding method using the mold 40 in the step [4], contamination of the mold 40 due to adhesion of additives such as ultraviolet absorbers to the mold 40 used in the insert injection molding method can be accurately suppressed. Therefore, a highly reliable eyeglass lens 30 can be manufactured, and the polarizing sheet of the present invention will be described in detail below.

<Polarizing sheet 15>
The polarizing sheet 15 of the present invention comprises a polarizing film 13, a first resin layer 11 provided on one side of the polarizing film 13, and a second resin layer 12 provided on the other side of the polarizing film 13, and the first resin layer 11 and the second resin layer 12 each independently contain a resin material and an additive, and of the first resin layer 11 and the second resin layer 12, at least the first resin layer 11 contains, as an additive, an ultraviolet absorber that has an inflection point in the wavelength range of 380 nm or more and 440 nm or less in the light absorption spectrum of the additive (ultraviolet absorber).

The polarizing sheet 15 (polarizing sheet of the present invention) will be described below, starting with each component (each layer) that constitutes the polarizing sheet 15. As described above, the polarizing sheet 15 only needs to include the first resin layer 11, the polarizing film 13, and the second resin layer 12. In this embodiment, however, the polarizing sheet 15 will be described as further including an adhesive layer 16 that bonds (adheres) the polarizing film 13 to the first resin layer 11, and an adhesive layer 17 that bonds (adheres) the polarizing film 13 to the second resin layer 12.

Figure 3 is a vertical cross-sectional view showing an embodiment of the polarizing sheet of the present invention, and Figure 4 is a vertical cross-sectional view showing a curved polarizing sheet in which the polarizing sheet shown in Figure 3 has a curved shape. For convenience of explanation, the upper side of Figures 3 and 4 will be referred to as "top" and the lower side will be referred to as "bottom" below.

(Polarizing film 13)
The polarizing film 13 has a function of extracting linearly polarized light having a polarization plane in a predetermined direction from the incident light (unpolarized natural light). As a result, the light passing through the polarizing sheet 15 (curved polarizing sheet 10) becomes polarized.

The degree of polarization of the polarizing film 13 is not particularly limited, but is preferably, for example, 50% to 100%, and more preferably, 80% to 100%. The visible light transmittance of the polarizing film 13 is not particularly limited, but is preferably, for example, 10% to 80%, and more preferably, 20% to 50%.

The material for the polarizing film 13 is not particularly limited as long as it has the above-mentioned functions, but examples include polymer films made of polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl butyral, polycarbonate, ethylene-vinyl acetate copolymer partially saponified product, etc., which are dyed and uniaxially stretched with dichroic substances such as iodine or dichroic dyes, and polyene-based oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride.

Among these, the polarizing film 13 is preferably a polymer film whose main material is polyvinyl alcohol (PVA), which is dyed with iodine or a dichroic dye and then uniaxially stretched. Polyvinyl alcohol (PVA) is a material that has excellent transparency, heat resistance, affinity with the dyeing agent iodine or a dichroic dye, and orientation when stretched. Therefore, the polarizing film 13 whose main material is PVA has excellent heat resistance and polarizing ability.

Examples of the dichroic dyes include Chloratin Fast Red, Congo Red, Brilliant Blue 6B, Benzopurpurine, Chlorazol Black BH, Direct Blue 2B, Diamine Green, Chrysophenone, Sirius Yellow, Direct Fast Red, and Acid Black.

The thickness of the polarizing film 13 is not particularly limited, but is preferably, for example, 5 μm or more and 60 μm or less, and more preferably 10 μm or more and 40 μm or less.

(First resin layer 11)
2(d) and 3, the first resin layer 11 is provided on the lower surface (one surface) of the polarizing film 13, and functions as a protective layer that protects the polarizing film 13. In addition, as shown in Fig. 4, in the curved polarizing sheet 10 in which the polarizing sheet 15 is curved, the lower surface (the surface opposite to the polarizing film 13) of the first resin layer 11 forms a curved concave surface.

This first resin layer 11 is not particularly limited, but is composed of a resin composition containing, as a main material, a resin material such as a polyamide-based resin, a polycarbonate-based resin, or a cellulose resin such as triacetyl cellulose, and one or more of these may be used in combination. Among these, it is preferable that the first resin layer 11 is composed mainly of a polyamide-based resin or a polycarbonate-based resin.

Polycarbonate-based resins are excellent in transparency (translucency) and mechanical strength such as rigidity, and therefore can improve the transparency and impact resistance of the curved polarizing sheet 10. In addition, polycarbonate-based resins have a specific gravity of about 1.2, which makes them one of the lightest resin materials, and therefore can reduce the weight of the polarizing sheet 15. In addition to transparency and impact resistance, polyamide-based resins can also improve chemical resistance, stress resistance, and other properties.

The polyamide resin is not particularly limited, and various types can be used, such as alicyclic polyamide and semi-aromatic polyamide. Alicyclic polyamide is a material with excellent impact resistance. Therefore, the polarizing sheet 15 can be made to exhibit excellent impact resistance. Furthermore, semi-aromatic polyamide is a material with a high elastic modulus. Therefore, the polarizing sheet 15 can be made to have excellent resistance to stress such as bending.

In this specification, semi-aromatic polyamide refers to a polyamide in which one of the dicarboxylic acid and diamine monomers constituting the polyamide is an aromatic compound and the other is an aliphatic compound, and can be specifically represented by the following formula (1B).

(In the formula (1B), one of ^R1 and ^R2 is a divalent aromatic substituent and the other is a divalent aliphatic substituent, and n is an integer of 2 or more.)

The polyamide may be a copolymer (random copolymer, block copolymer, etc.) containing two or more types of monomers of at least one of dicarboxylic acid and diamine.

The aromatic substituents of R ¹ and R ² in the above formula (1B) are preferably those represented by the following formula (2B).

(In formula (2B), l and m each independently represent an integer of 0 to 2.)

This allows the polarizing film 13 to be protected more effectively and allows the curved polarizing sheet 10 to be more easily processed. Furthermore, when retardation is imparted to the first resin layer 11, it is possible to more easily control the retardation by stretching the first resin layer 11.

The aliphatic substituents of R ¹ and R ² in the above formula (1B) preferably have 4 to 18 carbon atoms, more preferably are hydrocarbon groups having 4 to 18 carbon atoms, and even more preferably are saturated hydrocarbon groups having 4 to 18 carbon atoms.

This allows for better processability when forming the polarizing sheet 15 into a curved polarizing sheet 10 having a curved shape.

Furthermore, it is preferable that the semi-aromatic polyamide contains an aromatic dicarboxylic acid and an aliphatic diamine as constituent monomers. This makes it possible to more effectively protect the polarizing film 13 and to improve the processability when forming the polarizing sheet 15 into the curved polarizing sheet 10 having a curved shape. In addition, it is easier to control the retardation by stretching.

Alicyclic polyamides have an alicyclic chemical structure in their molecules, and may have an alicyclic chemical structure in their main chain structure or in their side chain structure.

Examples of such alicyclic polyamides include compounds in which at least one of the dicarboxylic acid and diamine monomers constituting the polyamide has an alicyclic chemical structure, and specifically, for example, can be represented by the following formula (3B).

(In formula (3B), R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group having 4 or less carbon atoms, o represents an integer of 2 or more and 14 or less, p represents an integer of 0 or more and 6 or less, and n represents an integer of 2 or more.)

There are no particular limitations on the polycarbonate resin, and various types can be used, but among them, aromatic polycarbonate resins or heteroalicyclic polycarbonate resins are preferable. Aromatic polycarbonate resins have aromatic rings in their main chains, which can improve the strength of the polarizing sheet 15. Heteroalicyclic polycarbonate resins have heteroaliphatic rings in their main chains, which can improve the heat resistance of the polarizing sheet 15.

This aromatic polycarbonate resin is synthesized, for example, by an interfacial polycondensation reaction between bisphenol and phosgene, or an ester exchange reaction between bisphenol and diphenyl carbonate.

Examples of bisphenols include bisphenol A and bisphenol (modified bisphenol) which is the source of the repeating units of polycarbonate shown in the following formula (1A).

(In formula (1A), X is an alkyl group, an aromatic group, or a cyclic aliphatic group having 1 to 18 carbon atoms, Ra and Rb are each independently an alkyl group having 1 to 12 carbon atoms, m and n are each an integer of 0 to 4, and p is the number of repeating units.)

Specific examples of bisphenols that are the source of the repeating units of the polycarbonate represented by formula (1A) include 4,4'-(pentane-2,2-diyl)diphenol, 4,4'-(pentane-3,3-diyl)diphenol, 4,4'-(butane-2,2-diyl)diphenol, 1,1'-(cyclohexanediyl)diphenol, 2-cyclohexyl-1,4-bis(4-hydroxyphenyl)benzene, 2,3-biscyclohexyl-1,4-bis(4-hydroxyphenyl)benzene, 1,1'-bis(4-hydroxy-3-methylphenyl)cyclohexane, and 2,2'-bis(4-hydroxy-3-methylphenyl)propane, and these can be used alone or in combination of two or more.

In particular, it is preferable that the aromatic polycarbonate resin is mainly composed of a bisphenol-type polycarbonate resin having a skeleton derived from bisphenol. By using such a bisphenol-type polycarbonate resin, the curved polarizing sheet 10 exhibits even greater strength.

The heteroalicyclic polycarbonate resin has a heteroaliphatic ring in its main chain, and this heteroaliphatic ring is preferably composed of two rings, each of which has one side connected to the other to form a condensed polycyclic structure. Each of the two rings is preferably a five-membered or six-membered ring.

For these reasons, the preferred structure of the carbonate structural unit in heteroalicyclic polycarbonate resins is, for example, that represented by the following formula (2X).

Heteroalicyclic polycarbonate resins having carbonate structural units represented by the above formula (2X) can be obtained by polycondensation reaction between an ether diol represented by the following formula (2Xa) and a carbonate diester such as diphenyl carbonate.

Examples of such carbonate structural units include 1,4:3,6-dianhydro-D-sorbitol (isosorbide) type units represented by the following formula (2XA) and 1,4:3,6-dianhydro-D-mannitol (isomannide) type units represented by the following formula (2XB).

The glass transition temperature (Tg) of the resin material contained as the main material in the resin composition constituting the first resin layer 11 is preferably 100°C or higher and 190°C or lower, and more preferably 105°C or higher and 155°C or lower. This makes it relatively easy to form the curved polarizing sheet 10 by heat bending the polarizing sheet 15 in the step [3]. Furthermore, when retardation is to be expressed in the first resin layer 11, stretching for the expression of this retardation can be suitably performed. Furthermore, the durability and reliability of the curved polarizing sheet 10 can be made excellent.

As described above, the first resin layer 11 having such a configuration is composed of a resin composition whose main material is a resin material, but in the present invention, the resin composition contains an additive, and as this additive, an ultraviolet absorber (UVA) having an inflection point in the wavelength range of 380 nm or more and 440 nm or less in the light absorption spectrum of the additive (ultraviolet absorber) is contained.

Thus, in the present invention, of the resin layer 35 and the polarizing sheet 15 (curved polarizing sheet 10) constituting the eyeglass lens 30, the polarizing sheet 15, more specifically, the first resin layer 11 provided in the polarizing sheet 15, contains an additive. Therefore, the resin composition constituting the resin layer 35 does not contain an additive such as an ultraviolet absorber, or even if it does contain an additive, the content of the additive can be set low. Therefore, in the step [4], when obtaining the eyeglass lens 30 by the insert injection molding method using the mold 40, the contamination of the mold 40 due to the additive such as an ultraviolet absorber adhering to the mold 40 used in the insert injection molding method can be appropriately suppressed. If the resin composition constituting the resin layer 35 contains a large amount of additive, not only the contact surface with the molded resin layer 35, but also the flow path in the mold 40 through which the resin composition constituting the resin layer 35, i.e., the resin composition used to form the resin layer 35, flows when it is supplied into the mold 40, will be contaminated. In response to this, as described above, the first resin layer 11 contains additives, and the resin composition constituting the resin layer 35 does not contain additives such as ultraviolet absorbents, or if it does contain them, the content is set low, thereby accurately suppressing or preventing the occurrence of contamination in the flow paths provided in the mold 40.

In addition, in the step [4], when the eyeglass lens 30 is obtained by the insert injection molding method using the mold 40, the second resin layer 12 of the first resin layer 11 and the second resin layer 12 of the polarizing sheet 15 (curved polarizing sheet 10) contacts the contact surface of the mold 40 with the curved polarizing sheet 10, and the first resin layer 11 does not contact it. Therefore, by containing an ultraviolet absorber having an inflection point in the wavelength range of 380 nm to 440 nm in the light absorption spectrum (hereinafter, sometimes referred to as a "long wavelength ultraviolet absorber") as an additive contained in the resin composition constituting the first resin layer 11, it is possible to accurately suppress or prevent leakage of a rare and expensive substance such as a long wavelength ultraviolet absorber from the resin composition constituting the first resin layer 11 due to contamination of the inside of the mold 40. In addition, since leakage of such a long wavelength ultraviolet absorber can be accurately suppressed or prevented, the eyeglass lens 30 including the polarizing sheet 15 (curved polarizing sheet 10) can be made to have excellent reliability.

The long wavelength UV absorbent is not particularly limited as long as it has an inflection point in the wavelength range of 380 nm to 440 nm in the light absorption spectrum of the long wavelength UV absorbent. For example, it may have an inflection point in the wavelength range of 380 nm to 410 nm, or in the wavelength range of more than 410 nm to 440 nm. One or more of these may be used in combination. This allows the long wavelength UV absorbent to reliably absorb light in the wavelength range of 380 nm to 440 nm, and therefore it is possible to accurately suppress or prevent light in this wavelength range from passing through the polarizing sheet 15 (curved polarizing sheet 10) and ultimately the eyeglass lens 30.

In addition, a long wavelength UV absorber having an inflection point in the wavelength range of 380 nm to 440 nm preferably has a light transmittance of 10% or less in the wavelength range of 400 nm to 417 nm in its light absorption spectrum, and more preferably has a light transmittance of 5% or less in the wavelength range of 400 nm to 417 nm. This makes it possible to more significantly exert the effects obtained by using a long wavelength UV absorber having an inflection point in the wavelength range of 380 nm to 440 nm.

Examples of long-wavelength UV absorbents having an inflection point in the wavelength range of 380 nm to 410 nm include those having an inflection point near 402 nm (manufactured by Daiwa Chemical Industry Co., Ltd., "DAINSORB T-206"), those having an inflection point near 409 nm (manufactured by BASF Japan, Ltd., "Tinopal OB"), and those having an inflection point near 400 nm (manufactured by Chemipro Chemical Industry Co., Ltd., "KEMISORB 73"). Examples of long-wavelength UV absorbents having an inflection point in the wavelength range of more than 410 nm to 440 nm include those having an inflection point near 417 nm (manufactured by Orient Chemical Industry Co., Ltd., "UA3912"), those having an inflection point near 416 nm (manufactured by Kiwa Chemical Industry Co., Ltd., "KP PLAST UVA"), and those having an inflection point near 427 nm (manufactured by Fujifilm Corporation, "OUV-012"), etc.

The degree to which light in the long wavelength range can be transmitted through the polarizing sheet 15 is preferably such that in the light absorption spectrum of the polarizing sheet 15, the light transmittance in the wavelength range of 390 nm to 420 nm is set to 7.0% or less, more preferably to 5.0% or less, and even more preferably to 3.0% or less. By setting the light transmittance to the upper limit or less, it can be said that the transmission of ultraviolet light in the long wavelength range (light in the wavelength range of 380 nm to 430 nm) through the polarizing sheet 15 is appropriately suppressed.

In this case, the content of the long wavelength ultraviolet absorber in the resin composition constituting the first resin layer 11 is preferably 0.04% by weight or more and 2.70% by weight or less, and more preferably 0.05% by weight or more and 2.00% by weight or less. By setting the content of the long wavelength ultraviolet absorber within the above range, it is possible to more accurately suppress or prevent light in the wavelength range of 380 nm to 430 nm from passing through the polarizing sheet 15 (curved polarizing sheet 10) and ultimately the eyeglass lens 30.

In addition, the additives contained in the resin composition constituting the first resin layer 11 may contain other additives in addition to the long wavelength ultraviolet absorber, and are not particularly limited. For example, ultraviolet absorbers (UVB, UVC) that have a light absorption peak in the shorter wavelength region than the long wavelength ultraviolet absorber, light absorbers (visible light absorbers), colorants such as dyes, lubricants, fillers, alignment aids, heat stabilizers, antioxidants, plasticizers, colorants, flame retardants, antistatic agents, and viscosity adjusters can be used alone or in combination of two or more of these.

In this way, when the first resin layer 11 contains an additive other than the long wavelength UV absorber in addition to the long wavelength UV absorber, the content of the additive in the resin composition constituting the first resin layer 11, i.e., the total content of the long wavelength UV absorber and the other additives, is preferably 0.10% by weight or more and 3.00% by weight or less, more preferably 0.15% by weight or more and 2.30% by weight or less, even more preferably 0.20% by weight or more and 2.00% by weight or less, and particularly preferably 0.30% by weight or more and 1.80% by weight or less.

Here, when the resin composition constituting the first resin layer 11 contains a polyamide-based resin or a polycarbonate-based resin as a resin material, the first resin layer 11 is provided with excellent mechanical strength or impact resistance, respectively. On the other hand, when the curved polarizing sheet 10 is formed by the thermal bending process of the polarizing sheet 15 in the step [3], depending on the temperature conditions during the thermal bending process, a problem may arise in that the thermal bending of the polarizing sheet 15 cannot be performed with excellent accuracy. On the other hand, by setting the content of the additive in the resin composition constituting the first resin layer 11 within the above range, flexibility during heating can be imparted to the first resin layer 11. Therefore, the curved polarizing sheet 10 can be formed by the thermal bending process of the polarizing sheet 15 in the step [3] with excellent accuracy.

The average thickness of the first resin layer 11 is not particularly limited, and is preferably, for example, 0.15 mm or more and 2.00 mm or less, and more preferably 0.25 mm or more and 1.00 mm or less. This ensures that the first resin layer 11 is provided with the above-mentioned function as the first resin layer 11. In addition, the effect obtained by adding a long wavelength ultraviolet absorber to the resin composition constituting the first resin layer 11 can be ensured.

(Second resin layer 12)
2(d) and 3, the second resin layer 12 is provided on the upper surface (the other surface) of the polarizing film 13, and functions as a protective layer that protects the polarizing film 13. Then, as shown in Fig. 4, in the curved polarizing sheet 10 in which the polarizing sheet 15 is curved, the upper surface (the surface opposite to the polarizing film 13) of the second resin layer 12 forms a curved convex surface.

The second resin layer 12 is not particularly limited, but like the first resin layer 11, is composed of a resin composition containing a resin material as the main material, and this resin material is preferably a polyamide-based resin or a polycarbonate-based resin.

The polyamide-based resin and polycarbonate-based resin may be the same as those described as being contained in the resin composition constituting the first resin layer 11.

The second resin layer 12 having such a configuration is composed of a resin composition mainly made of a resin material, as described above. This resin composition may contain additives, as in the first resin layer 11, but if it contains additives, it is preferable that the additive does not contain a long-wavelength ultraviolet absorber, or if it does, the content of the additive is set lower than the content of the long-wavelength ultraviolet absorber in the first resin layer 11. As a result, in the step [4], when obtaining the eyeglass lens 30 by the insert injection molding method using the mold 40, the second resin layer 12 comes into contact with the contact surface of the mold 40 with the curved polarizing sheet 10, but the contamination of the mold 40 due to this contact can be appropriately suppressed or prevented. In addition, it is possible to appropriately suppress or prevent a large amount of a rare and expensive substance such as a long-wavelength ultraviolet absorber from leaking out of the resin composition constituting the second resin layer 12 due to contamination of the inside of the mold 40.

In addition, when the resin composition constituting the second resin layer 12 contains an additive such as a long-wavelength ultraviolet absorber, the contact surface of the mold 40 with the curved polarizing sheet 10 may be contaminated by the additive contained in the resin composition constituting the second resin layer 12. In contrast, when the resin composition constituting the resin layer 35 contains an additive, not only the contact surface of the mold 40 with the resin layer 35 but also the flow path in the mold 40 through which the resin composition constituting the resin layer 35 flows will be contaminated. Therefore, by configuring the resin composition constituting the second resin layer 12 to contain an additive, it is possible to accurately prevent contamination from occurring in the flow path in the mold 40.

Additives containing long wavelength ultraviolet absorbents can be the same as those described as being contained in the resin composition constituting the first resin layer 11.

Furthermore, when the second resin layer 12 contains an additive, the content of the additive in the resin composition constituting the second resin layer 12 is preferably 0.10% by weight or more and 3.00% by weight or less, more preferably 0.20% by weight or more and 2.30% by weight or less, and even more preferably 0.23% by weight or more and 2.00% by weight or less. By setting the content of the additive in the resin composition constituting the second resin layer 12 within the above range, flexibility during heating can be imparted to the second resin layer 12, as in the case of adding an additive to the resin composition constituting the first resin layer 11. Therefore, the formation of the curved polarizing sheet 10 by the thermal bending process of the polarizing sheet 15 in the step [3] can be performed with excellent accuracy.

The average thickness of the second resin layer 12 is not particularly limited, and is preferably, for example, 0.15 mm or more and 2.00 mm or less, and more preferably 0.25 mm or more and 1.0 mm or less. This ensures that the second resin layer 12 can be provided with the functions of the second resin layer 12 described above.

Furthermore, the first resin layer 11 and the second resin layer 12 configured as described above may or may not exhibit retardation, but if retardation is to be exhibited, it is preferable that the retardation of the first resin layer 11 and the retardation of the second resin layer 12 are different, and it is preferable that the retardation of the first resin layer 11 is lower than the retardation of the second resin layer 12.

As a result, the second resin layer 12 is easily deformed in a direction in which the curvature of curvature becomes smaller due to thermal shrinkage, but the first resin layer 11 is less likely to deform due to thermal shrinkage. Therefore, as shown in Figures 2 and 4, by applying the curved polarizing sheet 10 provided in the eyeglass lens 30, it is used in a curved state, but in this case, it is preferable to make the curved shape so that the second resin layer 12 is located on the curved convex surface side and the first resin layer 11 is located on the curved concave surface side. In this case, since the second resin layer 12 has a relatively high thermal shrinkage rate, it is relatively easy to thermally deform, but in the curved polarizing sheet 10, the first resin layer 11 exerts a function of suppressing the thermal deformation of the second resin layer 12. Therefore, the curved polarizing sheet 10 as a whole can be prevented from excessive deformation due to heat. As a result, it is possible to accurately suppress or prevent the shape of the eyeglass lens 30 itself from being deformed due to the thermal deformation of the curved polarizing sheet 10.

The retardation of the first resin layer 11 is preferably 0 nm or more and 500 nm or less, and more preferably 50 nm or more and 350 nm or less. The retardation of the second resin layer 12 is preferably 2600 nm or more and 8000 nm or less, and more preferably 3500 nm or more and 6500 nm or less. This allows the retardation of the first resin layer 11 to be sufficiently low, and the retardation of the second resin layer 12 to be sufficiently high. Therefore, the polarization performance of the curved polarizing sheet 10 can be sufficiently improved.

The difference in retardation between the first resin layer 11 and the second resin layer 12 can be achieved by varying the constituent materials contained in the layers, the thickness, and even the stretching ratio, etc.

The stretching ratio of the first resin layer 11 is not particularly limited, but is preferably, for example, 0.95 to 1.1 so as to be set to the magnitude of the retardation. The stretching ratio of the second resin layer 12 is not particularly limited, but is preferably, for example, 1.5 to 3.5 so as to be set to the magnitude of the retardation.

It is also preferable that the stretching directions of the first resin layer 11, the second resin layer 12, and the polarizing film 13 are the same. This can further improve the polarization performance of the curved polarizing sheet 10.

(Adhesive Layer 16 and Adhesive Layer 17)
The adhesive layer 16 (first adhesive layer) and the adhesive layer 17 (second adhesive layer) respectively have the function of bonding the polarizing film 13 to the first resin layer 11 and the polarizing film 13 to the second resin layer 12. This can improve the durability of the curved polarizing sheet 10.

The adhesive (or pressure-sensitive adhesive) constituting the adhesive layers 16, 17 is not particularly limited, and examples include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, etc. Among these, urethane adhesives are preferred. This can provide the adhesive layers 16, 17 with excellent transparency, adhesive strength, and durability, while also providing excellent adaptability to changes in shape.

The thickness of the adhesive layers 16, 17 is not particularly limited, but is preferably 5 μm or more and 60 μm or less, and more preferably 10 μm or more and 40 μm or less. This ensures that the adhesive layers 16, 17 can function properly.

Depending on the configuration of the first resin layer 11, the second resin layer 12, and the polarizing film 13, the formation of the adhesive layers 16 and 17 may be omitted.

The curved polarizing sheet 10 preferably has a total thickness of 0.1 mm or more and 2 mm or less.

The polarizing sheet and optical components of the present invention have been described above, but the present invention is not limited to these.

For example, each part constituting the polarizing sheet of the present invention can be replaced with any other part having a similar function.

In addition to the above-mentioned configuration, the polarizing sheet of the present invention may also include any other components.

More specifically, for example, the polarizing sheet of the present invention may include an intermediate layer, a power adjustment layer that adjusts the power of the lens, etc.

In the above embodiment, the optical component of the present invention, i.e., an optical component including a curved polarizing sheet in which the polarizing sheet of the present invention has a curved shape, is described as being applied to a spectacle lens, but the present invention is not limited to this case and can also be applied to, for example, a camera lens, a light-transmitting cover, a liquid crystal display cover, and the like.

The present invention will be described in more detail below with reference to examples. Note that the present invention is not limited to these examples.

1. Preparation of Raw Materials First, the raw materials used in manufacturing the polarizing sheet 15 are shown below.

(Polycarbonate Resin 1)
As polycarbonate-based resin 1, bisphenol A polycarbonate (manufactured by Mitsubishi Engineering Plastics Corporation, "E2000FN") was prepared.

(Ultraviolet absorber 1)
As ultraviolet absorbent 1, a long wavelength ultraviolet absorbent having an inflection point at about 417 nm in its light absorption spectrum (manufactured by Orient Chemical Industry Co., Ltd., "BONASORB UA 3912") was prepared.

(Ultraviolet absorber 2)
As the ultraviolet absorbent 2, a long wavelength ultraviolet absorbent having an inflection point in the vicinity of a wavelength of 402 nm in the light absorption spectrum (manufactured by Daiwa Kasei Co., Ltd., "DAINSORB T-206") was prepared.

(Ultraviolet absorber 3)
As the ultraviolet absorbent 3, a long wavelength ultraviolet absorbent (manufactured by Adeka Corporation, "LA-31RG") having an inflection point at about 380 nm in the light absorption spectrum was prepared.

(Light absorber 1)
As the light absorber 1, a blue dye (Kiwa Chemical Industry Co., Ltd., "KP Plast Blue R") was prepared.

(Light absorber 2)
As the light absorber 2, a red dye (Kiwa Chemical Industry Co., Ltd., "KP Plast Red H2G") was prepared.

(Light absorber 3)
As the light absorber 3, a red dye (Kiwa Chemical Industry Co., Ltd., "KP Plast Green G") was prepared.

(Lubricant 1)
As lubricant 1, monoglyceride (manufactured by Riken Vitamin Co., Ltd., "S-100A") was prepared.

2. Production of polarizing sheet (Example 1)
<1> First, a polyvinyl alcohol-based film was dyed with an aqueous solution containing a dye while being stretched in a water tank, and then treated with boric acid. The treated polyvinyl alcohol-based film was then washed with water and dried. This resulted in a polarizing film 13 having a thickness of 35 μm.

<2> Next, a resin composition used to form the first resin layer 11 was prepared by kneading a mixture of 98.456% by weight of polycarbonate resin 1, 1.500% by weight of ultraviolet absorber 1, 0.005% by weight of lubricant 1, 0.012% by weight of light absorber 2, and 0.005% by weight of light absorber 3.

Then, this resin composition was extruded using a vented single-screw extruder to obtain a sheet-like first resin layer 11 having a thickness of 0.300 mm and a retardation of 100 nm.

<3> Next, a resin composition used to form the second resin layer 12 was prepared by kneading a mixture of 99.761% by weight of polycarbonate resin 1, 0.2148% by weight of ultraviolet absorber 3, 0.0243% by weight of lubricant 1, 0.0002% by weight of light absorber 1, and 0.0001% by weight of light absorber 2.

Then, a first sheet having a thickness of 0.5 mm was obtained by extrusion molding using this resin composition with a vented single screw extruder. The first sheet was uniaxially stretched to twice its original size while being heated to 120°C, thereby obtaining a sheet-like second resin layer 12 having a thickness of 0.300 mm and a retardation of 2600 nm.

<4> Next, a two-part moisture-curing polyurethane adhesive (base: Mitsui Chemicals' "Takelac A-520", hardener: Mitsui Chemicals' "Takenate A-50") was applied as a first adhesive to one surface of the first resin layer 11 using a bar coater so that the thickness after drying was 20 μm. Also, a two-part moisture-curing polyurethane adhesive (base: Mitsui Chemicals' "Takelac A-520", hardener: Mitsui Chemicals' "Takenate A-50") was applied as a second adhesive to one surface of the second resin layer 12 using a bar coater so that the thickness after drying was 20 μm.

<5> Next, the first resin layer 11 and the second resin layer 12, on which the first adhesive and the second adhesive were applied, were placed in an oven and heated until the solvent in the first adhesive and the second adhesive was dried. This resulted in a first laminate in which the adhesive layer 16 (first adhesive layer) was laminated on one side of the first resin layer 11, and a second laminate in which the adhesive layer 17 (second adhesive layer) was laminated on one side of the second resin layer 12.

Then, the first laminate was laminated on the polarizing film 13 so that the first adhesive layer 16 was in contact with one side of the polarizing film 13, and the second laminate was laminated on the polarizing film 13 so that the second adhesive layer 17 was in contact with the other side of the polarizing film 13.Then, the first laminate, the polarizing film 13, and the second laminate were each pressed together using the rubber roll of a laminator to obtain the polarizing sheet 15 of Example 1.

(Examples 2 to 4, Reference Examples 1 to 2)
The polarizing sheets 15 of Examples 2 to 4 and Reference Examples 1 and 2 were obtained in the same manner as in Example 1, except that the first resin layer 11 and the second resin layer 12 were formed using resin compositions containing the constituent materials shown in Table 1 in the amounts shown in Table 1 as the resin compositions for forming the first resin layer 11 and the second resin layer 12, respectively.

3. Evaluation The polarizing sheets 15 of the respective Examples and Reference Examples were evaluated by the following methods.

<1> Heat Bending Processability of Polarizing Sheet 15 The heat bending processability of the polarizing sheets 15 of the respective Examples and Reference Examples was evaluated as follows.

That is, first, a protective film 50 made of polyolefin was laminated by a lamination method on both sides of the polarizing sheet 15, i.e., on the side of the first resin layer 11 opposite the polarizing film 13, and on the side of the second resin layer 12 opposite the polarizing film 13.

Next, this polarizing sheet 15 was punched out to a diameter of 8 cm, and then subjected to a thermal bending process while suctioning at 145° C. for 15 minutes using a Rema molding machine (vacuum molding machine) (CR-32 type), to obtain a curved polarizing sheet 10 with a radius of curvature R ₁ of 65.4 mm.

The surface properties of the first resin layer 11 and the second resin layer 12 of the curved polarizing sheet 10 that had been thermally bent were then visually observed, and evaluated based on the observation results as follows:

[Evaluation Criteria]
In the first resin layer 11 and the second resin layer 12, .circle-solid.: _R1 is less than 70.
◯: _R1 is 70 or more and less than 73.
Δ: _R1 is 73 or more and less than 76.
×: _R1 is 76 or more.

<2> UV transmittance of polarizing sheet 15 For each of the polarizing sheets 15 in the examples and reference examples, the light absorption spectrum was measured using a spectrophotometer (manufactured by JASCO Corporation, "V670") to measure the light transmittance in the wavelength range of 390 nm or more and 420 nm or less, and the sheets were evaluated based on the light transmittance as follows.

[Evaluation Criteria]
The light transmittance at wavelengths of 400 nm and 417 nm is: ⊚: 3.0% or less.
Good: More than 3.0% and 5.0% or less.
Δ: More than 5.0% and 7.0% or less.
×: More than 7.0%.

The evaluation results for the polarizing sheets 15 of each Example and Reference Example obtained as described above are shown in Table 1 below.

As shown in Table 1, in the polarizing sheets in each embodiment, the additive content in the first resin layer 11 and the second resin layer 12 was set within the range of 0.20% by weight or more and 2.50% by weight or less, respectively, and this resulted in satisfactory results in terms of heat bending processability.

In contrast, in the polarizing sheets of the reference examples, the additive content in the first resin layer 11 was not set within the range of 0.20% by weight or more and 2.50% by weight or less, and as a result, it became clear that the thermal bending processability was not satisfactory.

REFERENCE SIGNS LIST 10 Curved polarizing sheet 11 First resin layer 12 Second resin layer 13 Polarizing film 15 Polarizing sheet 16 First adhesive layer 17 Second adhesive layer 20 Frame 21 Rim portion 22 Bridge portion 23 Temple portion 24 Nose pad portion 30 Spectacle lens 35 Resin layer 40 Mold 50 Protective film 100 Sunglasses 150 Multilayer laminate 200 Curved multilayer laminate

Claims (9)

A polarizing sheet comprising a polarizing film, a first resin layer provided on one surface of the polarizing film, and a second resin layer provided on the other surface of the polarizing film,
The first resin layer and the second resin layer each independently contain a resin material and an additive,
a polarizing sheet, wherein of the first resin layer and the second resin layer, at least the first resin layer contains, as the additive, an ultraviolet absorber having an inflection point in a wavelength range of 380 nm or more and 440 nm or less in a light absorption spectrum of the additive. The polarizing sheet according to claim 1, wherein the ultraviolet absorbent includes at least one of an ultraviolet absorbent having an inflection point in the wavelength range of 380 nm or more and 410 nm or less in the light absorption spectrum of the ultraviolet absorbent, and an ultraviolet absorbent having an inflection point in the wavelength range of more than 410 nm and 440 nm or less. The polarizing sheet according to claim 1 or 2, wherein the polarizing sheet has a region in its light absorption spectrum that satisfies a light transmittance of 7.0% or less in the wavelength range of 390 nm or more and 420 nm or less. The polarizing sheet according to claim 1, wherein the polarizing sheet is used in a curved state with one side being a curved concave surface and the other side being a curved convex surface. The polarizing sheet according to claim 1, wherein the first resin layer and the second resin layer each independently have an average thickness of 0.15 mm or more and 2.00 mm or less. The polarizing sheet according to claim 5, wherein the first resin layer and the second resin layer each independently contain the additive in an amount of 0.10% by weight or more and 3.00% by weight or less. The polarizing sheet according to claim 6, wherein the first resin layer and the second resin layer are each independently composed mainly of a polycarbonate-based resin or a polyamide-based resin as the resin material. The polarizing sheet according to claim 7, wherein the glass transition point of the resin material is 100°C or higher and 190°C or lower. A substrate;
An optical component comprising: the polarizing sheet according to claim 1 laminated on the base material.

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