Polarizing laminates, polarizing curved laminates, eyeglass lenses and eyeglasses

Abstract

To provide polarizable laminates in which those where a curvature radius along one direction differs from a curvature radius along an orthogonal direction that is orthogonal to the one direction in a curved convex face can be prepared by thermal bending machining stably with excellent precision, to provide a polarizable curved laminate obtained by using such a polarizable laminate, and to provide a lens for glasses and glasses that have such a polarizable curved laminate and excellent reliability.SOLUTION: A polarizable laminate 15 has a polarization film 13, a first resin layer 11, and a second resin layer 12, and the second resin layer 12 has a larger thermal shrinkage ratio in one direction measured when being heated at temperature higher by 15°C than a glass transition point of a main material of the second resin layer 12 for 60 minutes in conformity with a method prescribed in JIS K 7133 than a thermal shrinkage ratio in an orthogonal direction orthogonal to the one direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to polarizing laminates, polarizing curved laminates, lenses for eyeglasses, and eyeglasses. [Background technology]

[0002] Eyeglass lenses have been proposed that feature a polarizing curved laminate (resin substrate) in which both sides of a polarizing film are covered with a coating layer mainly composed of polycarbonate resin or polyamide resin.

[0003] For example, this eyeglass lens is manufactured by attaching protective films to both sides of a polarizing laminate that is flat in plan view, and then punching out the polarizing laminate into a predetermined shape such as a circle in plan view. Subsequently, the polarizing laminate is subjected to a heat bending process under heating to create a curved polarizing laminate having a curved convex surface and a curved concave surface. After peeling the protective film off the polarizing curved laminate, the polarizing curved laminate is adsorbed onto a mold having a curved concave surface, with the concave surface of the polarizing curved laminate in contact with the concave surface of the mold, and then forming a resin layer mainly composed of a resin material such as a polycarbonate resin or a polyamide resin on the concave surface of the polarizing curved laminate using an insert injection molding method (see, for example, Patent Document 1).

[0004] In this method of manufacturing eyeglass lenses, as described above, a polarizing curved laminate is obtained by thermal bending of the polarizing laminate under heating, resulting in a curved shape with a curved convex surface and a curved concave surface. However, it is sometimes required to prepare a polarizing curved laminate in which the radius of curvature along one direction of the curved convex surface is different from the radius of curvature along the orthogonal direction perpendicular to this direction.

[0005] However, in reality, it was technically difficult to prepare polarizing curved laminates with such a configuration with excellent precision and in a stable manner. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2009-294445 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The object of the present invention is to provide a polarizing curved laminate having a curved shape comprising a curved convex surface and a curved concave surface, wherein the radius of curvature along one direction of the curved convex surface is different from the radius of curvature along a direction perpendicular to this one direction, and which can be prepared with excellent precision and stability by thermal bending; a polarizing curved laminate obtained using such a polarizing curved laminate; and reliable eyeglass lenses and eyeglasses equipped with such a polarizing curved laminate. [Means for solving the problem]

[0008] The purpose of this is as follows (1) ~ ( 10 This is achieved by the present invention as described in ). (1) A polarizing laminate having a flat plate shape, comprising a polarizing film, a first resin layer provided on one side of the polarizing film, and a second resin layer provided on the other side of the polarizing film, The second resin layer is heated in a way that conforms to the method specified in JIS K 7133, and when heated at a temperature 15°C higher than the glass transition point of the main material of the second resin layer for 60 minutes, the heat shrinkage rate in one direction is greater than the heat shrinkage rate in the orthogonal direction perpendicular to the aforementioned one direction. Ku, The heat shrinkage rate in the aforementioned one direction is S 3 Let [mm] be the size, and let S be the heat shrinkage rate in the orthogonal direction. 4 When set to [mm], the relationship 14.0% < 51.0% is satisfied. 3 -S 4 or (2) A polarizing laminate characterized by the following features.

[0010] ( 2 ) The heat shrinkage rate S3 is 15.0% or more and 50.0% or less ( 1The polarizing laminate according to

[0011] ( 3 ) The polarizing laminate according to the above (1), wherein a heat shrinkage rate of the first resin layer in the one direction is larger than the heat shrinkage rate in the orthogonal direction [Figure 1] .

[0012] ( 4 ) The polarizing laminate according to any one of the above (1) to ( 3 ), wherein the one direction is MD of the polarizing laminate, and the orthogonal direction is TD of the polarizing laminate

[0013] ( 5 ) The polarizing laminate according to any one of the above (1) to ( 4 ), wherein the first resin layer and the second resin layer have different retardations, the retardation of the first resin layer is 0 nm or more and 500 nm or less, and the retardation of the second resin layer is 2600 nm or more and 8000 nm or less

[0014] ( 6 ) The polarizing laminate according to any one of the above (1) to ( 5 ), wherein the first resin layer and the second resin layer are each independently composed mainly of a polycarbonate resin or a polyamide resin

[0015] ( 7 ) The polarizing laminate according to the above ( 6 ), wherein a glass transition point of the main material is 100°C or higher and 190°C or lower

[0016] ( 8 ) A polarizing curved laminate obtained by forming the polarizing laminate according to any one of the above (1) to ( 7 ) into a curved state in which one surface side is a curved concave surface and the other surface side is a curved convex surface, the polarizing curved laminate, wherein on the curved convex surface of the polarizing curved laminate, a radius of curvature in the one direction is smaller than a radius of curvature in the orthogonal direction

[0017] ( 9 ) the above( 8 Eyeglass lenses characterized by comprising a polarizing curved laminate as described in ). ( 10 ) the above( 9 Eyeglasses characterized by being equipped with the eyeglass lenses described in ). [Effects of the Invention]

[0018] According to the present invention, in a polarizing laminate comprising a polarizing film, a first resin layer provided on one side of the polarizing film, and a second resin layer provided on the other side of the polarizing film, the second resin layer is configured such that the heat shrinkage rate in one direction, measured when heated for 60 minutes at a temperature 15°C higher than the glass transition point of the main material of the second resin layer, in accordance with the method specified in JIS K 7133, is set to be greater than the heat shrinkage rate in the orthogonal direction perpendicular to the aforementioned one direction. Therefore, when obtaining a polarizing curved laminate having a curved shape with a curved convex surface and a curved concave surface by heat bending of the polarizing laminate of the present invention under heating, this polarizing curved laminate can be obtained with excellent precision and stability, having a configuration in which the radius of curvature along one direction and the radius of curvature along the orthogonal direction perpendicular to this one direction are different in the curved convex surface. [Brief explanation of the drawing]

[0019] [Figure 2] This is a perspective view showing an embodiment of sunglasses equipped with lenses having a polarizing curved laminate of the present invention. [Figure 3] This is a schematic diagram illustrating a method for manufacturing eyeglass lenses having a polarized curved laminate of the present invention using the polarized laminate of the present invention. [Figure 4] This is a longitudinal cross-sectional view showing an embodiment of the polarizing laminate of the present invention. ​ This is a longitudinal cross-sectional view showing an embodiment of the polarizing curved laminate of the present invention. [Modes for carrying out the invention]

[0020] Hereinafter, the polarizing laminate, polarizing curved laminate, eyeglass lens, and eyeglasses of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

[0021] The polarizing laminate 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, and is in the shape of a flat plate. The second resin layer 12 satisfies the condition that the heat shrinkage rate in one direction, measured when heated for 60 minutes at a temperature 15°C higher than the glass transition point of the main material of the second resin layer 12 in accordance with the method specified in JIS K 7133, is greater than the heat shrinkage rate in the orthogonal direction perpendicular to the aforementioned one direction.

[0022] As a result, when obtaining a polarizing curved laminate 10 having a curved shape with a curved convex surface and a curved concave surface by thermal bending of the polarizing laminate 15 under heating, this polarizing curved laminate 10 can be obtained with excellent precision and stability, having a configuration in which the radius of curvature along one direction of the curved convex surface is different from the radius of curvature along the orthogonal direction perpendicular to this one direction.

[0023] The polarizing curved laminate 10 (the polarizing curved laminate of the present invention), which has a curved shape with a curved convex surface and a curved concave surface, is obtained by subjecting the polarizing laminate 15 of the present invention to heat bending under heating. For example, it is used as a polarizing resin substrate for the lenses 30 of sunglasses 100, a type of eyeglasses. Therefore, before describing the polarizing laminate 15 and the polarizing curved laminate 10 of the present invention, the sunglasses 100 (the eyeglasses of the present invention) will be described first.

[0024] <Sunglasses> Figure 1 is a perspective view showing an embodiment of sunglasses equipped with lenses having a polarizing curved laminate according to the present invention. In Figure 1, when the sunglasses are worn on the wearer's head, the side of the lens facing the wearer's eyes is referred to as the back side, and the opposite side is referred to as the front side.

[0025] As shown in Figure 1, the sunglasses 100 comprises a frame 20 and eyeglass lenses 30.

[0026] In this specification, the term "eyeglass lenses" includes both lenses with a light-gathering function and lenses without a light-gathering function.

[0027] The frame 20 is attached to the user's head and is designed to position the eyeglass lenses 30 near the front of the user's eyes.

[0028] This frame 20 has a rim portion 21, a bridge portion 22, a temple portion 23, and a nose pad portion 24.

[0029] The rim portion 21 is ring-shaped, with one provided for each eye, the right and the left, and eyeglass lenses 30 are fitted inside. This allows the user to see external information through the eyeglass lenses 30.

[0030] Furthermore, the bridge portion 22 is rod-shaped and, when worn on the user's head, is positioned in front of the upper part of the user's nose, connecting the pair of rim portions 21.

[0031] The temple portion 23 is shaped like an arm and is connected to the edge opposite the position where the bridge portion 22 of each rim portion 21 is connected. When the glasses are worn on the wearer's head, the temple portion 23 is placed over the wearer's ears.

[0032] The nose pad portion 24 is provided on the edge of each rim portion 21 that corresponds to the user's nose when the sunglasses 100 are worn on the user's head, and it comes into contact with the user's nose, and at this time it has a shape that corresponds to the contact area of ​​the user's nose. This allows the sunglasses to be worn stably.

[0033] The materials used for each part of the frame 20 are not particularly limited, and various metal materials, various resin materials, etc., can be used. The shape of the frame 20 is not limited to that shown in the illustration, as long as it can be attached to the user's head.

[0034] The eyeglass lens 30 (the eyeglass lens of the present invention) is attached to each rim portion 21. This eyeglass lens 30 is a light-transmitting, plate-shaped member that is curved outward, and comprises a resin layer 35 and a polarizing curved laminate 10.

[0035] The resin layer 35 has light-transmitting properties and is located on the back side of the lens. When the spectacle lens 30 is given a light-gathering function, this resin layer 35 has the light-gathering function.

[0036] The constituent material of the eyeglass lens 30 is not particularly limited as long as it is a resin material that has light transmission properties. 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.

[0037] Examples of resin materials include polyethylene, polypropylene, polyolefins such as ethylene-propylene copolymer, polyvinyl chloride, polystyrene, polyamide, polyimide, polycarbonate, poly-(4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene copolymer (AS resin), butadiene-styrene copolymer, polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyethers, polyether ketones (PEK), and polyether ether ketones. Examples of suitable resins include PEEK, polyetherimide, polyacetal (POM), polyphenylene oxide, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, aromatic polyester (liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride, other fluororesins, epoxy resins, phenolic resins, urea resins, melamine resins, silicone resins, polyurethanes, etc., or copolymers, blends, polymer alloys, etc., mainly composed of these. In particular, it is preferable that the resin material is of the same type or identical to the resin material that constitutes the first resin layer 11 of the polarizing curved laminate 10 described later. This improves the adhesion between the resin layer 35 and the polarizing curved laminate 10. Furthermore, since the refractive index difference between the resin layer 35 and the polarizing curved laminate 10 can be set low, the reflection of light between the resin layer 35 and the polarizing curved laminate 10 can be effectively suppressed or prevented, thereby enabling light to be transmitted between the resin layer 35 and the polarizing curved laminate 10 with excellent light transmittance. The refractive index difference between the resin layer 35 and the polarizing curved laminate 10 is preferably 0.2 or less, and more preferably 0.1 or less. This makes the effect obtained by setting the refractive index difference low more pronounced.

[0038] The thickness of the resin layer 35 is not particularly limited, but is preferably 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 makes it possible to achieve both relatively high strength and lightweight properties in the eyeglass lens 30.

[0039] The polarizing curved laminate 10 is a curved resin substrate bonded to the outer surface of the resin layer 35, i.e., the curved convex surface, in a curved shape corresponding to that shape. By equipping the eyeglass lens 30 with this polarizing curved laminate 10, polarization is imparted to the sunglasses 100. As a result, the sunglasses 100 functions as polarized sunglasses. This polarizing curved laminate 10 is composed of the polarizing curved laminate of the present invention, but a detailed explanation will be given later.

[0040] As mentioned above, the eyeglass lenses 30 provided by the sunglasses 100 may or may not have a light-gathering function.

[0041] Furthermore, in addition to having a frame 20 as described above, the sunglasses 100 may also have a frameless configuration from the standpoint of fashion, lightness, etc.

[0042] Furthermore, although the eyeglasses of the present invention are applied to sunglasses 100 in this embodiment, the invention is not limited to this, and the eyeglasses of the present invention may be, for example, prescription eyeglasses, fashion eyeglasses, goggles that protect the eyes from wind, rain, dust, chemicals, etc.

[0043] In the sunglasses 100 having the above configuration, the eyeglass lenses 30 provided in the sunglasses 100 are manufactured in the present invention by following the method for manufacturing eyeglass lenses 30 as shown below.

[0044] <Method of manufacturing eyeglass lenses> Figure 2 is a schematic diagram illustrating a method for manufacturing eyeglass lenses having a polarizing curved laminate according to the present invention using the polarizing laminate of the present invention. For the sake of explanation, in the following, the upper part of Figure 1 will be referred to as "upper" and the lower part as "lower".

[0045] The following describes in detail each step of the manufacturing method for eyeglass lenses 30 equipped with the polarizing curved laminate 10 of the present invention. [1] First, a polarizing laminate 15 (the polarizing laminate of the present invention) is prepared, which has a flat overall shape, comprising a first resin layer 11, a polarizing film 13, and a second resin layer 12, and these are laminated in this order. Then, protective films 50 (masking tape) are attached to both sides of this polarizing laminate 15 to obtain a multilayer laminate 150 in which protective films 50 are attached to both sides of the polarizing laminate 15 (see Figure 2(a)).

[0046] [2] Next, as shown in Figure 2(b), the prepared multilayer laminate 150, that is, the polarizing laminate 15 with protective films 50 attached to both sides, is punched out in the thickness direction so that the multilayer laminate 150 has a circular shape when viewed from above.

[0047] [3] Next, as shown in Figure 2(c), the circular multilayer laminate 150 is subjected to a heat bending process under heating, thereby transforming the multilayer laminate 150 into a curved multilayer laminate 200 in which the first resin layer 11 side is a curved concave surface and the second resin layer 12 side is a curved convex surface. This makes it possible to transform a flat polarizing laminate 15 into a curved polarizing curved laminate 10 (the polarizing curved laminate of the present invention) with protective films 50 attached to both sides.

[0048] This thermal bending process is typically carried out by press forming or vacuum forming. In this case, the heating temperature (molding temperature) of the multilayer laminate 150 (polarized laminate 15) is, as described above, set to approximately 110°C to 170°C, more preferably 130°C to 160°C, taking into consideration the melting or softening temperatures of the resin layers 11 and 12, since the polarized laminate 15 comprises resin layers 11 and 12. By setting the heating temperature within this range, it is possible to prevent alteration and deterioration of the polarized laminate 15, soften or melt the polarized laminate 15, and reliably heat-bend the polarized laminate 15 to form a curved polarized curved laminate 10.

[0049] [4] Next, the protective film 50 is peeled off the heat-bent polarizing curved laminate 10. Then, as shown in Figure 2(d), the polarizing curved laminate 10 is adsorbed onto a mold 40 having a curved concave surface, such that the curved concave surface of the mold 40 and the curved convex surface of the polarizing curved laminate 10 are in contact. With the polarizing curved laminate 10 in this state, a resin layer 35, mainly composed of resin material, is injection molded onto the curved concave surface of the polarizing curved laminate 10 using, for example, an insert injection molding method. That is, the constituent material of the resin layer 35, which is in a molten state, is cooled and solidified while in contact with the curved concave surface of the polarizing curved laminate 10, thereby molding the resin layer 35 in direct contact with the curved concave surface of the polarizing curved laminate 10 without the use of an adhesive layer or the like. This produces an eyeglass lens 30 (eyeglass lens of the present invention) comprising the heat-bent polarizing curved laminate 10 and the resin layer 35.

[0050] Furthermore, among insert injection molding methods, injection compression molding is preferably used. In injection compression molding, a resin material for forming a resin layer 35 is injected into a mold 40 at low pressure, and then the mold 40 is closed at high pressure to apply compressive force to the resin material. Therefore, molding distortion and optical anisotropy caused by local orientation of resin molecules during molding are less likely to occur in the molded resin layer 35 and, consequently, in the eyeglass lens 30, making it a preferred method. In addition, by controlling the mold compression force applied uniformly to the resin material, the resin material can be cooled at a constant specific volume, thus enabling the production of a resin layer 35 with high dimensional accuracy.

[0051] In the manufacturing method for eyeglass lenses 30 as described above, in step [3], a polarizing curved laminate 10 having a curved shape with a curved convex surface and a curved concave surface can be obtained by heat bending the polarizing laminate 15 under heating. At this time, it is sometimes required to prepare a polarizing curved laminate 10 in which the radius of curvature along one direction of the curved convex surface is different from the radius of curvature along the orthogonal direction perpendicular to this one direction. In response to such requirements, by using the polarizing laminate of the present invention as the polarizing laminate 15 to be subjected to heat bending under heating, a polarizing curved laminate 10 having the above-described configuration can be obtained with excellent precision and stability. As a result, highly reliable eyeglass lenses 30 and, consequently, sunglasses 100 can be manufactured with a high yield. The polarizing laminate 15 of the present invention will be described in detail below.

[0052] <Polarizing laminate 15> The polarizing laminate 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 is in the shape of a flat plate. The second resin layer 12 satisfies the condition that the heat shrinkage rate in one direction, measured when heated for 60 minutes at a temperature 15°C higher than the glass transition point of the main material of the second resin layer 12 in accordance with the method specified in JIS K 7133, is greater than the heat shrinkage rate in the orthogonal direction perpendicular to the aforementioned one direction.

[0053] Below, we will first describe the various parts (layers) that make up the polarizing laminate 15 (the polarizing curved laminate of the present invention). As described above, the polarizing laminate 15 only needs to include a first resin layer 11, a polarizing film 13, and a second resin layer 12. However, in this embodiment, we will describe the case in which the laminate further includes an adhesive layer 16 that joins (bonds) the polarizing film 13 and the first resin layer 11, and an adhesive layer 17 that joins (bonds) the polarizing film 13 and the second resin layer 12.

[0054] Figure 3 is a longitudinal cross-sectional view showing an embodiment of the polarizing laminate of the present invention. For the sake of explanation, in the following, the upper part of Figure 1 will be referred to as "upper" and the lower part as "lower".

[0055] (Polarizing film 13) The polarizing film 13 has the function of extracting linearly polarized light with a polarization plane in a predetermined direction from incident light (unpolarized natural light). As a result, the light passing through the polarizing laminate 15 becomes polarized.

[0056] The degree of polarization of the polarizing film 13 is not particularly limited, but is preferably 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 10% to 80%, and more preferably 20% to 50%.

[0057] The constituent materials of such a polarizing film 13 are not particularly limited as long as they have the above-mentioned functions, but examples include polymer films composed of polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl butyral, polycarbonate, partially saponified ethylene-vinyl acetate copolymer, etc., on which dichroic substances such as iodine or dichroic dyes are adsorbed and dyed, and then uniaxially stretched; and polyene-based oriented films such as dehydrated polyvinyl alcohol or dehydrochlorinated polyvinyl chloride.

[0058] Among these, the polarizing film 13 is preferably made by adsorbing iodine or a dichroic dye onto a polymer film mainly composed of polyvinyl alcohol (PVA), dyeing it, and then uniaxially stretching it. Polyvinyl alcohol (PVA) is a material that is excellent in terms of transparency, heat resistance, affinity with iodine or a dichroic dye used as a dyeing agent, and orientation during stretching. Therefore, the polarizing film 13 made mainly of PVA has excellent heat resistance and excellent polarizing ability.

[0059] In this specification, "main material" refers to the constituent material that makes up the layer (film) containing this material, and which is present in an amount of 50% by weight or more.

[0060] Examples of the dichroic dyes mentioned above include Chloratin Fast Red, Congo Red, Brilliant Blue 6B, Benzopurprine, Chlorazole Black BH, Direct Blue 2B, Diamine Green, Chrysophenone, Sirius Yellow, Direct Fast Red, and Acid Black.

[0061] The thickness of the polarizing film 13 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.

[0062] Furthermore, the refractive index of the polarizing film 13 is not particularly limited, but is preferably 1.45 or more and 1.55 or less, and more preferably 1.47 or more and 1.53 or less.

[0063] (First resin layer 11 and second resin layer 12) As shown in Figures 2(d), 3, and 4, the first resin layer 11 and the second resin layer 12 are provided on the lower side (one side) and upper side (the other side) of the polarizing film 13, respectively, and thus function as protective layers to protect the polarizing film 13.

[0064] These first resin layer 11 and second resin layer 12 are not particularly limited, but are mainly composed of resin materials such as polyamide resins, polycarbonate resins, and cellulose resins such as triacetylcellulose, and one or more of these can be used in combination. In particular, it is preferable that they are mainly composed of polyamide resins or polycarbonate resins.

[0065] Polycarbonate resins are rich in transparency (light transmission) and mechanical strength such as rigidity, which can improve the transparency and impact resistance of the polarizing laminate 15. Furthermore, polycarbonate resins have a specific gravity of approximately 1.2, classifying them as lightweight among resin materials, thus contributing to the weight reduction of the polarizing laminate 15. Polyamide resins, in addition to transparency and impact resistance, can improve chemical resistance and stress resistance.

[0066] The polyamide resin is not particularly limited, and various types can be used, such as alicyclic polyamides and semi-aromatic polyamides. Alicyclic polyamides are materials with excellent impact resistance. Therefore, the polarizing laminate 15 can exhibit excellent impact resistance. Semi-aromatic polyamides are materials with a high elastic modulus. Therefore, the polarizing laminate 15 can have excellent resistance to stress such as bending.

[0067] In this specification, a semi-aromatic polyamide refers to a polyamide in which one of the constituent monomers, a dicarboxylic acid or a diamine, is an aromatic compound and the other is an aliphatic compound, and can be specifically represented by the following formula (1B).

[0068] [ka] (However, R in equation (1B) 1 and R 2 (where one substituent is a divalent aromatic substituent and the other is a divalent aliphatic substituent, and n is an integer greater than or equal to 2.)

[0069] Furthermore, the polyamide may be a copolymer (random copolymer, block copolymer, etc.) containing two or more monomers of at least one of dicarboxylic acid and diamine.

[0070] Also, R in the above formula (1B) 1 , R 2 The aromatic substituent among them is preferably represented by the following formula (2B).

[0071] [ka] (However, in equation (2B), l and m are independent integers between 0 and 2, inclusive.)

[0072] This allows for more favorable protection of the polarizing film 13 and improves the processability of the polarizing laminate 15. Furthermore, when retardation is applied to the resin layers 11 and 12, it becomes easier to control the retardation by stretching the resin layers 11 and 12.

[0073] In the above equation (1B), R 1 , R 2 The aliphatic substituents among them are preferably those having 4 to 18 carbon atoms, more preferably hydrocarbon groups having 4 to 18 carbon atoms, and even more preferably saturated hydrocarbon groups having 4 to 18 carbon atoms. This makes it possible to improve the processability of the polarizing laminate 15.

[0074] Furthermore, it is preferable that the semi-aromatic polyamide contains an aromatic dicarboxylic acid and an aliphatic diamine as constituent monomers. This allows for more suitable protection of the polarizing film 13 and improves the processability of the polarizing laminate 15. It also makes it easier to control retardation due to stretching.

[0075] Alicyclic polyamides have an alicyclic chemical structure within their molecule; this may be in the main chain structure or in the side chain structure.

[0076] Examples of alicyclic polyamides include compounds in which at least one of the dicarboxylic acid or diamine monomers constituting the polyamide has an alicyclic chemical structure, and specifically, for example, can be represented by the following formula (3B).

[0077] [ka] (However, in equation (3B), R 3 , R 4 Each of these is independently either a hydrogen atom or a hydrocarbon group with 4 or fewer carbon atoms, o is an integer between 2 and 14, p is an integer between 0 and 6, and n is an integer greater than or equal to 2.

[0078] The polycarbonate resin is not particularly limited, and various types can be used, but aromatic polycarbonate resins are preferred. Aromatic polycarbonate resins have aromatic rings in their main chain, which makes the strength of the polarizing laminate 15 even better.

[0079] This aromatic polycarbonate resin can be synthesized, for example, by an interfacial polycondensation reaction between bisphenol and phosgene, or a transesterification reaction between bisphenol and diphenyl carbonate.

[0080] Examples of bisphenols include bisphenol A and bisphenol (modified bisphenol) which is the origin of the repeating units of polycarbonate shown in formula (1A) below.

[0081] [ka] (In formula (1A), X is an alkyl group, aromatic group, or 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 integers from 0 to 4; and p is the number of repeating units.)

[0082] Specifically, examples of bisphenols that originate from the repeating units of the polycarbonate shown in 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, 2,2'-bis(4-hydroxy-3-methylphenyl)propane, and one or more of these can be used in combination.

[0083] In particular, it is preferable that the polycarbonate resin mainly consists of a bisphenol-type polycarbonate resin having a bisphenol-derived skeleton. By using such a bisphenol-type polycarbonate resin, the polarizing laminate 15 exhibits even greater strength.

[0084] The glass transition temperature (Tg) of the resin material contained as the main material in the first resin layer 11 and the second resin layer 12 is preferably 100°C to 190°C, and more preferably 120°C to 165°C. This makes it relatively easy to form the polarizing laminate 15 by thermal bending in step [3]. Furthermore, when retardation is to occur in the first resin layer 11 and the second resin layer 12, the stretching required for this retardation can be carried out appropriately. In addition, the durability and reliability of the polarizing laminate 15 can be improved.

[0085] Furthermore, the first resin layer 11 and the second resin layer 12 may contain other components in addition to the resin material included as the main material. Such components are not particularly limited, but examples include resin materials other than the main material, colorants such as dyes, fillers, orientation aids, stabilizers (heat stabilizers, UV absorbers and antioxidants, etc.), plasticizers, colorants, flame retardants, antistatic agents and viscosity modifiers.

[0086] In this case, the content of the resin material in the first resin layer 11 or the second resin layer 12 is not particularly limited, but it is preferably 75 parts by mass or more, and more preferably 85 parts by mass or more, per 100 parts by mass of the first resin layer 11 or the second resin layer 12. By keeping the content of the resin material within the above range, the polarizing laminate 15 can be made to exhibit excellent strength.

[0087] The constituent materials of the first resin layer 11 and the second resin layer 12 may be the same or different.

[0088] Of these first resin layer 11 and second resin layer 12, the second resin layer 12 is configured such that, in accordance with the method specified in JIS K 7133, the heat shrinkage rate in one direction, measured when heated for 60 minutes at a temperature 15°C higher than the glass transition point of the main material of the second resin layer 12, is set to be greater than the heat shrinkage rate in the orthogonal direction perpendicular to the aforementioned one direction.

[0089] In step [3], a polarizing curved laminate 10 having a curved shape with a curved convex surface and a curved concave surface can be obtained by heat bending the polarizing laminate 15 under heating. It is sometimes required to prepare a polarizing curved laminate 10 in which the radius of curvature along one direction and the radius of curvature along the orthogonal direction perpendicular to this one direction are different in the curved convex surface on the second resin layer 12 side.

[0090] Correspondingly, in the present invention, as described above, in the polarizing laminate 15, the heat shrinkage rate in one direction is set to be larger than the heat shrinkage rate in the orthogonal direction. Therefore, when the polarizing laminate 15 is subjected to hot bending under heating, on the surface of the polarizing laminate 15 where the second resin layer 12, which is to form a curved convex surface, is positioned, the radius of curvature in the one direction becomes smaller than the radius of curvature in the orthogonal direction. That is, in the polarizing curved laminate 10 obtained by performing hot bending, the radius of curvature along one direction and the radius of curvature along the orthogonal direction on the curved convex surface on the second resin layer 12 side can be set to different sizes. Then, the magnitudes of the radii of curvature in the one direction and the orthogonal direction are set based on the magnitudes of the heat shrinkage rates in the one direction and the orthogonal direction, respectively. Therefore, a plurality of polarizing curved laminates 10 in which the radius of curvature along the one direction and the radius of curvature along the orthogonal direction have different sizes can be stably obtained with excellent accuracy while maintaining the magnitudes of these radii of curvature substantially constant.

[0091] As described above, the heat shrinkage rate in one direction in the second resin layer 12 of the polarizing laminate 15 only needs to be larger than the heat shrinkage rate in the orthogonal direction. Specifically, when the heat shrinkage rate in the one direction is defined as S3 [%] and the heat shrinkage rate in the orthogonal direction is defined as S4 [%], it is preferable that the relationship 10.0% < S3 - S4 < 65.0% is satisfied, and it is more preferable that the relationship 14.0% < S3 - S4 < 51.0% is satisfied. Accordingly, it can be said that the heat shrinkage rate S3 in the one direction is set to be sufficiently larger than the heat shrinkage rate S4 in the orthogonal direction. Therefore, the radius of curvature along the one direction and the radius of curvature along the orthogonal direction on the curved convex surface on the second resin layer 12 side of the polarizing curved laminate 10 obtained by performing hot bending can be reliably set to different sizes. Specifically, when the radius of curvature along the one direction is defined as R1 [mm] and the radius of curvature along the orthogonal direction is defined as R2 [mm], the relationship 0.59 < R1 / R2 < 0.95, which will be described later, can be satisfied.

[0092] In this case, the heat shrinkage rate S3 in one direction is preferably 15.0% or more and 50.0% or less, more preferably 20.0% or more and 45.0% or less. Further, the heat shrinkage rate S4 in the orthogonal direction is preferably -30.0% or more and 5.0% or less, more preferably -20.0% or more and -5.0% or less. This makes it possible to reliably set the magnitude of (S3-S4) within the above range.

[0093] In contrast, in the first resin layer 11 of the polarizing laminate 15, the heat shrinkage rate in one direction is preferably larger than the heat shrinkage rate in the orthogonal direction perpendicular to the one direction, similarly to the second resin layer 12. This makes it possible to more reliably obtain the polarizing curved laminate 10 obtained by hot bending under heating as a laminate in which the radius of curvature along one direction on the curved convex surface differs from the radius of curvature along the orthogonal direction perpendicular to the one direction.

[0094] In this case, when the heat shrinkage rate in the one direction in the first resin layer 11 is defined as S1 [%] and the heat shrinkage rate in the orthogonal direction is defined as S2 [%], it is preferable to satisfy the relationship of 0.0% < S1 - S2 < 10.0%, and more preferable to satisfy the relationship of 0.0% < S1 - S2 < 5.0%. Although the magnitude of (S1-S2) is smaller than the magnitude of (S3-S2), by setting the magnitude of (S1-S2) within the above range, the polarizing curved laminate 10 obtained by performing hot bending can be obtained with higher accuracy, in which the radius of curvature R1 along one direction on the curved convex surface and the radius of curvature R2 along the orthogonal direction perpendicular to the one direction reliably have different magnitudes.

[0095] Specifically, the heat shrinkage rate S1 in one direction is preferably -5.0% to 15.0%, and more preferably -3.0% to 10.0%. Furthermore, the heat shrinkage rate S2 in the orthogonal direction is preferably -10.0% to 10.0%, and more preferably -7.0% to -5.0%. This ensures that the magnitude of (S1-S2) can be reliably set within the above range.

[0096] Furthermore, by setting the heat shrinkage rates S1 to S4 within the aforementioned range, the second resin layer 12 is more susceptible to deformation in the direction of decreasing radius of curvature due to thermal shrinkage, while the first resin layer 11 is less susceptible to deformation due to thermal shrinkage compared to the second resin layer 12. Here, the polarized curved laminate 10 obtained by applying a heat bending process to the polarized laminate 15 is applied to the eyeglass lens 30 as shown in Figure 2, as described above. In this case, the second resin layer 12 is located on the curved convex side, and the first resin layer 11 is located on the curved concave side. In this case, the second resin layer 12 is relatively susceptible to thermal deformation due to its high heat shrinkage rate, but in the polarized curved laminate 10, the first resin layer 11 exhibits a function of suppressing the thermal deformation of the second resin layer 12. Therefore, excessive deformation due to heat can be prevented for the polarized curved laminate 10 as a whole. As a result, it is possible to effectively suppress or prevent deformation of the shape of the eyeglass lens 30 itself due to thermal deformation of the polarizing curved laminate 10.

[0097] As described above, the second resin layer 12 having heat shrinkage rates S3 and S4, and the first resin layer 11 having heat shrinkage rates S1 and S2, can be obtained, for example, by appropriately setting the stretching ratio for stretching the second resin layer 12 and the first resin layer 11 along the MD, when the aforementioned one direction is defined as the MD (flow direction) of the second resin layer 12 and the first resin layer 11, and the aforementioned orthogonal direction is defined as the TD (direction perpendicular to the flow direction) of the second resin layer 12 and the first resin layer 11.

[0098] The stretch ratio along the MD of the second resin layer 12 is not particularly limited, but is preferably 1.5 to 3.5 so as to be set to the size of the heat shrinkage rates S3 and S4. Similarly, the stretch ratio along the MD of the first resin layer 11 is not particularly limited, but is preferably 0.95 to 1.1 so as to be set to the size of the heat shrinkage rates S1 and S2.

[0099] Furthermore, by stretching the first resin layer 11 and the second resin layer 12 along the MD, retardation can be induced in the first resin layer 11 and the second resin layer 12. In this case, by setting the heat shrinkage rates S1 to S4 within the aforementioned range, it becomes possible to set the retardation of the first resin layer 11 lower than that of the second resin layer 12.

[0100] In this case, the retardation of the first resin layer 11 is preferably 0 nm to 500 nm, and more preferably 50 nm to 350 nm. The retardation of the second resin layer 12 is preferably 2600 nm to 8000 nm, and more preferably 3500 nm to 6500 nm. This makes it possible to sufficiently lower the retardation of the first resin layer 11 and sufficiently raise the retardation of the second resin layer 12, thereby sufficiently improving the polarization performance of the polarizing laminate 15.

[0101] The average thickness of the second resin layer 12 is preferably, for example, 0.2 mm or more and 1.0 mm or less, and more preferably 0.25 mm or more and 0.7 mm or less. This makes it relatively easy to obtain a second resin layer 12 in which the heat shrinkage rates S3 and S4 are set within the above range.

[0102] Furthermore, the average thickness of the first resin layer 11 is preferably, for example, 0.1 mm or more and 0.8 mm or less, and more preferably 0.1 mm or more and 0.4 mm or less. This makes it relatively easy to obtain a second resin layer 12 in which the heat shrinkage rates S1 and S2 are set within the above range.

[0103] Furthermore, the refractive indices of the first resin layer 11 and the second resin layer 12 are not particularly limited, but are preferably 1.45 or more and 1.66 or less, and more preferably 1.48 or more and 1.60 or less.

[0104] (Adhesive layer 16 and adhesive layer 17) The adhesive layer 16 (first adhesive layer) and the adhesive layer 17 (second adhesive layer) 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, respectively. This improves the durability of the polarizing laminate 15.

[0105] The adhesive (or tackifier) ​​constituting the adhesive layers 16 and 17 is not particularly limited, and examples include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, etc. Among these, urethane adhesives are preferred. This makes it possible to improve the transparency, adhesive strength, and durability of the adhesive layers 16 and 17, while also providing particularly excellent conformability to changes in shape.

[0106] The thickness of the adhesive layers 16 and 17 is not particularly limited, but is preferably 5 μm to 60 μm, and more preferably 10 μm to 40 μm. This ensures that the adhesive layers 16 and 17 reliably provide their intended function.

[0107] Furthermore, the refractive index of the adhesive layers 16 and 17 is not particularly limited, but is preferably 1.45 or more and 1.55 or less, and more preferably 1.47 or more and 1.53 or less.

[0108] Furthermore, it is preferable that the polarizing laminate 15 having such a configuration has a total thickness of 0.1 mm or more and 2 mm or less.

[0109] The polarizing laminate 15, which has the above-described configuration of each part (each layer), can be obtained, for example, by preparing a second resin layer 12 in which the magnitudes of heat shrinkage rates S3 and S4 are set within the above range, and a first resin layer 11 in which the magnitudes of heat shrinkage rates S1 and S2 are set within the above range, and bonding these to the polarizing film 13 via a first adhesive layer 16 and a second adhesive layer 17, respectively.

[0110] In addition, in the polarizing curved laminate 10, the adhesive layers 16 and 17 may be omitted depending on the composition of the first resin layer 11, the second resin layer 12, and the polarizing film 13.

[0111] By subjecting such a polarizing laminate 15 (the polarizing laminate of the present invention) to a heat bending process in step [3], a polarizing curved laminate 10 is obtained in which the surface on the first resin layer 11 side (one side) forms a curved concave surface and the surface on the second resin layer 12 side (the other side) forms a curved convex surface, wherein the radius of curvature R1 in one direction on the curved convex surface is smaller than the radius of curvature R2 in the orthogonal direction. In other words, a polarizing curved laminate 10 can be prepared in which the radius of curvature R1 along one direction and the radius of curvature R2 along the orthogonal direction are different on the curved convex surface on the second resin layer 12 side (the other side). The polarizing curved laminate 10 (the polarizing curved laminate of the present invention) will be described below.

[0112] <Polarizing curved laminate 10> Figure 4 is a longitudinal cross-sectional view showing an embodiment of the polarizing curved laminate of the present invention. For the sake of explanation, in the following, the upper side of Figure 1 will be referred to as "upper" and the lower side as "lower".

[0113] Here, in the aforementioned step [4] of the method for manufacturing eyeglass lenses, in the formation of the resin layer 35 on the polarizing curved laminate 10 using the insert injection molding method, the process involves adhering the curved polarizing curved laminate 10 to the curved concave surface of the mold 40 so that the curved convex surface of the polarizing curved laminate 10 corresponds to the curved concave surface of the mold 40.

[0114] At this time, the adsorption of the polarizing curved laminate 10 onto the mold 40 is generally performed manually by an operator, and it is necessary to smoothly grasp the polarizing curved laminate 10 from the work table in this process.

[0115] In response to such a requirement, in the formation of the polarizing curved laminate 10 having a curved shape by subjecting a flat polarizing laminate 15 to hot bending under heating in the step [3], the polarizing curved laminate 10 is generally produced by setting the curvature of the curved convex surface of the polarizing curved laminate 10 to be substantially the same as the curvature of the curved concave surface of the mold 40 used in the step [4].

[0116] In the mold 40 used in the method for manufacturing eyeglass lenses, generally, when the radius of curvature in one direction of the curved concave surface is R B1 [mm], and the radius of curvature in the orthogonal direction perpendicular to the one direction is R B2 [mm], molds satisfying R B1 =R B2 are frequently used.

[0117] Accordingly, for the polarizing curved laminate 10 to be in close contact with the curved concave surface of the mold 40, a laminate satisfying the relationship among the radius of curvature R1 [mm] in the one direction and the radius of curvature R2 [mm] in the orthogonal direction that R B1 =R B2 =R1=R2 is generally prepared.

[0118] However, when a polarizing curved laminate 10 satisfying R1=R2 is used, leaving the polarizing curved laminate 10 stationary on a horizontal work table results in a large number of contact points between the polarizing curved laminate 10 and the work table, which makes it difficult to grasp the polarizing curved laminate 10.

[0119] In contrast, in the present invention, as the polarizing curved laminate 10, one satisfying the relationship R1 < R2 can be prepared, which has a configuration where the radius of curvature R1 along the one direction is different from the radius of curvature R2 along the orthogonal direction. When the polarizing curved laminate 10 satisfying the relationship R1 < R2 is used, that is, when the radius of curvature R1 [mm] is made smaller than the radius of curvature R2 [mm], when the polarizing curved laminate 10 is left standing on a horizontal workbench, the bottom part of the polarizing curved laminate 10 in the one direction with a smaller radius of curvature contacts the workbench only at a point. Therefore, the work of grasping the polarizing curved laminate 10 can be simplified, and thus the working efficiency of operators can be improved.

[0120] The curved concave surface of the mold 40 has a curvature set corresponding to the spectacle lens 30 to be molded, and is normally set to 1 curve or more and 9 curves or less in both the one direction and the orthogonal direction, and the radius of curvature R B1 , radius of curvature R B2 when converted, is set to 58 mm or more and 523 mm or less.

[0121] When such a spectacle lens 30 is formed, it is only necessary for the polarizing curved laminate 10 to satisfy the relationship R1 < R2, and it is further preferable that R1 / R2 satisfies the relationship 0.59 < R1 / R2 < 0.95. When stacking the polarizing curved laminates 10 on a workbench with their curved convex surfaces facing upward, satisfying the above relationship allows the stacked polarizing curved laminates 10 not to fall over easily, while maintaining the ease of grasping the polarizing curved laminates 10.

[0122] In addition, as described above, in the formation of the resin layer 35 on the polarizing curved laminate 10 using insert injection molding in the step [4] of the method for manufacturing a spectacle lens, it is necessary to adsorb the curved polarizing curved laminate 10 onto the curved concave surface of the mold 40 such that the curved convex surface of the polarizing curved laminate 10 corresponds to the curved concave surface, without falling off.

[0123] In particular, when using injection compression molding as an insert injection molding method, the resin material for forming the resin layer 35 in the mold 40 is injected at low pressure. Therefore, it is necessary to accurately position the polarizing curved laminate 10 to adhere to the curved concave surface of the mold 40.

[0124] Given this requirement, in the process [3] described above, in forming a curved polarizing curved laminate 10 by heat bending a flat polarizing laminate 15 under heating, the polarizing curved laminate 10 is usually manufactured by setting the curvature of the curved convex surface of the polarizing curved laminate 10 to be approximately the same as the curvature of the curved concave surface of the mold 40 used in the process [4] described above. However, in this case, there was a problem in that the polarizing curved laminate 10 frequently fell off the mold 40 because it could not be adsorbed to the mold 40 with good adsorption.

[0125] As a result of diligent research into these problems, the inventors have found that by intentionally creating a discrepancy between the curvature of the curved convex surface of the polarizing curved laminate 10 and the curvature of the curved concave surface of the mold 40, the frequency of the polarizing curved laminate 10 falling out of the mold 40 can be reduced.

[0126] Furthermore, the inventors conducted further investigations into the magnitude of this deviation and found that R1 ≠ R B1 R²≠R B2 When at least one of the following is satisfied, 0.75 <R B1 / R1<1.3, 0.75 <R B2 By setting the displacement to a value that satisfies the relationship / R2 < 1.3, the polarizing curved laminate 10 can be adsorbed to the mold 40 with excellent adsorption properties, thereby accurately suppressing or preventing the frequency of the polarizing curved laminate 10 falling off the mold 40. As a result, it has been found that highly reliable eyeglass lenses 30 can be manufactured with a high yield.

[0127] Accordingly, in the present invention, as the polarizing curved laminate 10, a polarizing curved laminate 10 having a configuration in which the radius of curvature R1 along the one direction and the radius of curvature R2 along the orthogonal direction are different from each other, and satisfying the relationship of radius of curvature R1 < radius of curvature R2 can be prepared. Therefore, by appropriately setting the magnitudes of the radius of curvature R1 and the radius of curvature R2 while satisfying the relationship of R1 < R2, 0.75 < R B1 / R1<1.3, 0.75<R B2 / R2 < 1.3 can be satisfied, so the frequency of the polarizing curved laminate 10 falling off from the mold 40 can be accurately suppressed or prevented.

[0128] Further, by appropriately setting the magnitudes of the radius of curvature R1 and the radius of curvature R2 while satisfying the relationship of radius of curvature R1 < radius of curvature R2, when R1 < R B1 and R2 > R B2 , it is further preferable to satisfy the relationship of 1.05 < R B1 / R1 < 1.3 and 0.75 < R B2 / R2 < 0.95. This makes it possible to more significantly reduce the frequency of the polarizing curved laminate 10 falling off from the mold 40.

[0129] Further, it is preferable that the radius of curvature R1 and the radius of curvature R2 satisfy the following two relational expressions.

[0130] Specifically, on one hand, when R1 < R B1 and R2 > R B2 , it is more preferable to further satisfy 0.59 < R1 / R2 < 0.95.

[0131] On the other hand, it is preferable to satisfy the following relational expression (1), and more preferable to satisfy the following relational expression (1').

[0132] [Mathematical]

[0133] By setting the aforementioned relational expressions (1) and (1') within the specified range, the frequency of detachment of the polarizing curved laminate 10 from the mold 40 can be reduced more significantly. As a result, highly reliable eyeglass lenses 30 can be manufactured with even higher yield.

[0134] The polarizing laminate, polarizing curved laminate, eyeglass lens, and eyeglasses of the present invention have been described above, but the present invention is not limited to these.

[0135] For example, each component constituting the polarizing laminate and the polarizing curved laminate of the present invention can be replaced with any component capable of performing similar functions.

[0136] Furthermore, the polarizing laminate and the polarizing curved laminate of the present invention may have any additional components in addition to the configuration described above.

[0137] More specifically, for example, the polarizing curved laminate of the present invention may include an intermediate layer, a power adjustment layer for adjusting the power of the lens, and so on. [Examples]

[0138] The present invention will be described in detail below based on examples, but the present invention is not limited thereto. 1. Manufacturing of polarizing curved laminates (Example 1) First, a polyvinyl alcohol-based film was stretched in a water tank, dyed with an aqueous solution of a dye, and then treated with boric acid. After that, the treated polyvinyl alcohol-based film was washed with water and dried. This yielded a polarizing film 13 with a thickness of 35 μm.

[0139] On the other hand, a polyamide resin (alicyclic polyamide, "Grilamid TR90" manufactured by EMS Corporation) was used as the first resin material, and a sheet-like first resin layer 11 with a thickness of 0.2 mm and retardation of 100 nm was obtained by extrusion molding using a vented single-screw extruder.

[0140] For the obtained first resin layer 11, the heat shrinkage rate in both the MD (flow direction) and TD (orthogonal direction perpendicular to the flow direction) was measured by heating the first resin layer 11 at a temperature 15°C higher than the glass transition point of the main material of the first resin layer for 60 minutes, in accordance with the method specified in JIS K 7133. Specifically, for the obtained first resin layer 11, a circle with a diameter of 100 mm was drawn on the sample (width 150 mm, length 150 mm, thickness 4 mm) with a compass, and it was heated and dried in a hot air circulation oven set to 90°C for 24 hours. After cooling to 23°C in a desiccator, the diameter L0 in both the MD and TD directions was measured after drying. Subsequently, it was heated in a hot air circulation oven set to 170°C for 60 minutes, cooled to 23°C in a desiccator, and the diameter L1 after heating at the previously measured circle diameter point was measured. The heat shrinkage rate S (%) was calculated using the following formula (A). When the average of two calculations was taken, the heat shrinkage rate S1 (%) for MD was 1.0%, and the heat shrinkage rate S2 (%) for TD was also 1.0%. S(%) = (L0 - L1) / L0 × 100 … (A)

[0141] Furthermore, a polyamide resin (Grilamid TR90, manufactured by EMS Corporation) was used as the second resin material, and a first sheet with a thickness of 0.5 mm was obtained by extrusion molding using 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 with a thickness of 0.4 mm and a retardation of 2600 nm.

[0142] Furthermore, the second resin layer 12 after stretching was annealed by heating it at 135°C for 10 minutes.

[0143] The obtained second resin layer 12 was measured for heat shrinkage in both the MD (flow direction) and TD (orthogonal direction perpendicular to the flow direction) according to the method specified in JIS K 7133 described above. The heat shrinkage S3 (%) in the MD direction was 31.0%, and the heat shrinkage S4 (%) in the TD direction was -13.3%.

[0144] Next, a two-component moisture-curing polyurethane adhesive (main component: Mitsui Chemicals, "Takelac A-520", hardener: Mitsui Chemicals, "Takenate A-50") was applied to one surface of the first resin layer 11 using a bar coater to a thickness of 20 μm after drying. Furthermore, a two-component moisture-curing polyurethane adhesive (main component: Mitsui Chemicals, "Takelac A-520", hardener: Mitsui Chemicals, "Takenate A-50") was applied to one surface of the second resin layer 12 using a bar coater to a thickness of 20 μm after drying.

[0145] Next, the first resin layer 11 and the second resin layer 12, to which the first adhesive and the second adhesive were applied, were placed in an oven and heated until the solvent in the first and second adhesives dried. This resulted in a first laminate in which an adhesive layer 16 (first adhesive layer) was laminated on one surface of the first resin layer 11, and a second laminate in which an adhesive layer 17 (second adhesive layer) was laminated on one surface of the second resin layer 12.

[0146] Subsequently, the first laminate was laminated onto the polarizing film 13 such that the first adhesive layer 16 was in contact with one surface of the polarizing film 13, and the second laminate was laminated onto the polarizing film 13 such that the second adhesive layer 17 was in contact with the other surface of the polarizing film 13, thereby obtaining the polarizing laminate 15 of Example 1. At this time, the first laminate, the polarizing film 13, and the second laminate were pressed together using the rubber rolls of a laminator machine, and the total thickness of the polarizing laminate 15 was set to 0.75 mm.

[0147] Then, protective films 50 made of polyolefin were laminated by lamination on both sides of the polarizing laminate 15, that is, on the surface of the first resin layer 11 opposite to the polarizing film 13, and on the surface of the second resin layer 12 opposite to the polarizing film 13.

[0148] Next, the polarizing laminate 15 was punched out to a diameter of 8 cm, and then heat-bent using a Rema forming machine (vacuum forming machine) (CR-32 type) at 140°C for 10 minutes while under suction, thereby obtaining the polarizing curved laminate 10 of Example 1, in which the radius of curvature R1 in the MD (one direction) was 80.5 mm and the radius of curvature R2 in the TD (orthogonal direction perpendicular to the one direction) was 87.2 mm.

[0149] (Examples 2-12, 14-16, Comparative Example 1) Except for appropriately changing the conditions for obtaining the first resin layer 11 and the second resin layer 12 to obtain the retardation size shown in Table 1, and performing thermal bending processing on the polarizing laminate 15 while using a LEMA molding machine (vacuum forming machine) (CR-32 type) to obtain polarizing curved laminate 10 with curvature radii R1 and R2 sizes shown in Table 1, the polarizing curved laminate 10 of Examples 2 to 12, Examples 14 to 16, and Comparative Example 1 were obtained in the same manner as in Example 1.

[0150] The conditions for annealing the second resin layer 12 after stretching were as follows: Condition A: 135℃, 10min Condition B: 100℃, 10min Condition C: 60℃, 10min

[0151] (Example 13) Except that the first resin material used to form the first resin layer 11 and the second resin material used to form the second resin layer 12 were replaced with polycarbonate resins (Mitsubishi Engineering Plastics, "Yupilon E-2000") instead of polyamide resins (EMS, "Grilamid TR90"), resulting in the retardation size shown in Table 1, and the polarizing curved laminate 10 was obtained in the same manner as in Example 1 by performing a heat bending process on the polarizing laminate 15 using a Rema molding machine (vacuum forming machine) (CR-32 type) at 150°C for 10 minutes while under suction, resulting in the curvature radius R1 and curvature radius R2 shown in Table 1, the polarizing curved laminate 10 of Example 14 was obtained in the same manner as in Example 1.

[0152] 2. Evaluation The polarized curved laminate 10 of each example and comparative example was evaluated as follows. (Detachability of the polarized curved laminate 10 from the mold 40) The polarized curved laminate 10 of each example and comparative example was evaluated as follows.

[0153] In other words, for each example and comparative example of the polarized curved laminate 10, the radius of curvature R is as shown in Table 1. B1 [mm] and radius of curvature R B2 The sample was attached to a mold 40 having a curved concave surface [mm], and after 5 seconds, it was checked whether or not it detached from the mold 40.

[0154] Then, to check for detachment of the polarizing curved laminate 10 in each example and comparative example, 100 units were collected for each example and comparative example.

[0155] (Ease of gripping polarized curved laminate (without protective gloves)) The polarizing curved laminate 10 of each example and comparative example was placed on a horizontal workbench with the curved convex surface facing upwards, and 10 people were asked to confirm whether it was easy to grasp without protective gloves. ◎: Effective for 8-10 out of 10 people. ○: Effective for 3 to 7 out of 10 people. ×: Effective for 0-2 out of 10 people.

[0156] (Ease of gripping polarized curved laminate (with protective gloves)) The polarized curved laminate 10 of each example and comparative example was placed on a horizontal workbench with the curved convex surface facing upwards, and the effectiveness of the improved grip was confirmed for 10 people wearing commercially available protective gloves. ◎: Effective for 8-10 out of 10 people. ○: Effective for 3 to 7 out of 10 people. ×: Effective for 0-2 out of 10 people.

[0157] (Number of stacked polarizing curved laminates) The polarized curved laminates 10 of each example and comparative example were stacked on a horizontal workbench with the curved convex surface facing upwards, and the maximum number that could be stacked was confirmed. Table 1 shows the evaluation results obtained in the evaluation of the polarizing curved laminate 10 as described above.

[0158] [Table 1]

[0159] As shown in Table 1, in each embodiment, the heat shrinkage rate S3 in the MD (one direction) is set to be greater than the heat shrinkage rate S4 in the TD (orthogonal direction perpendicular to the one direction). As a result, when a polarizing curved laminate 10 is obtained by heat bending of the polarizing laminate 15 under heat, the radius of curvature R1 along the MD on the curved convex surface on the second resin layer 12 side is smaller than the radius of curvature R2 along the TD, meaning that the radii of curvature R1 and R2 are different, and this was obtained with excellent accuracy.

[0160] In contrast, in the comparative example, the heat shrinkage rate S3 and the heat shrinkage rate S4 were set to the same size. As a result, it was not possible to obtain a polarized curved laminate 10 obtained by heat bending of the polarized laminate 15 under heat, in which the radius of curvature R1 and the radius of curvature R2 on the curved convex surface on the second resin layer 12 side were different. [Explanation of Symbols]

[0161] 10 Polarizing curved laminate 11 First resin layer 12 Second resin layer 13 Polarizing film 15 Polarizing laminate 16. First adhesive layer 17. Second adhesive layer 20 frames 21 Rim section 22 Bridge section 23 Temple section 24 Nose pad section 30 eyeglass lenses 35 Resin layer 40 molds 50 protective films 100 Sunglasses 150 Multilayer laminate 200 curved multilayer laminate

Claims

1. A polarizing laminate having a plate shape, comprising a polarizing film, a first resin layer provided on one side of the polarizing film, and a second resin layer provided on the other side of the polarizing film, The second resin layer, when heated for 60 minutes at a temperature 15°C higher than the glass transition point of the main material of the second resin layer in accordance with the method specified in JIS K 7133, has a heating shrinkage rate in one direction that is greater than the heating shrinkage rate in the orthogonal direction perpendicular to the aforementioned one direction. A polarizing laminate characterized in that, when the heat shrinkage rate in one direction is S3 [mm] and the heat shrinkage rate in the orthogonal direction is S4 [mm], the relationship 14.0% < S3 - S4 < 51.0% is satisfied.

2. The aforementioned heat shrinkage rate S ３ The polarizing laminate according to claim 1, wherein the content is 15.0% or more and 50.0% or less.

3. The polarizing laminate according to claim 1 or 2, wherein the first resin layer has a heat shrinkage rate in one direction greater than the heat shrinkage rate in the orthogonal direction.

4. The polarizing laminate according to any one of claims 1 to 3, wherein the aforementioned one direction is the MD of the polarizing laminate, and the aforementioned orthogonal direction is the TD of the polarizing laminate.

5. The polarizing laminate according to any one of claims 1 to 4, wherein the first resin layer and the second resin layer have different retardations, the retardation of the first resin layer being 0 nm or more and 500 nm or less, and the retardation of the second resin layer being 2600 nm or more and 8000 nm or less.

6. The polarizing laminate according to any one of claims 1 to 5, wherein the first resin layer and the second resin layer are each independently composed of a polycarbonate resin or a polyamide resin as the main material.

7. The polarizing laminate according to claim 6, wherein the glass transition temperature of the main material is 100°C or higher and 190°C or lower.

8. A polarizing curved laminate according to any one of claims 1 to 7, wherein one side of the polarizing laminate is a curved concave surface and the other side of the laminate is a curved convex surface, A polarizing curved laminate characterized in that, in the curved convex surface of the polarizing curved laminate, the radius of curvature in one direction is smaller than the radius of curvature in the orthogonal direction.

9. An eyeglass lens characterized by comprising the polarizing curved laminate described in claim 8.

10. Eyeglasses characterized by being equipped with the eyeglass lenses described in claim 9.

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