Eyeglass lens and eyeglasses

Abstract

Provided is an eyeglass lens comprising a lens base material and a multilayer film located on an object-side surface of the lens base material. The lens base material contains an ultraviolet absorber, and an average reflectance of the object-side surface of the eyeglass lens in a wavelength range of not less than 290 nm and not more than 340 nm is 70.0% or more.

Description

Eyeglass lenses and eyeglasses Cross-reference of related applications

[0001] This application claims priority to Japanese Patent Application No. 2025-054963, filed on 28 March 2025, the entirety of which is incorporated herein by reference as a particular disclosure.

[0002] This invention relates to eyeglass lenses and eyeglasses.

[0003] Eyeglass lenses are generally manufactured by forming a functional film on the surface of a lens substrate to provide the desired function to the eyeglass lens. Such functional films are often formed by creating a multilayer film on the surface of the lens substrate (see, for example, Japanese Patent No. 5976363, the full description of which is incorporated herein by reference).

[0004] In recent years, the eyeglass lens market has seen the introduction and sale of a variety of products featuring various functions. A desirable characteristic for providing eyeglass lenses with higher added value in the market is minimal change in appearance over time.

[0005] One aspect of the present invention aims to provide eyeglass lenses that exhibit minimal changes in appearance over time.

[0006] Eyeglass lenses sometimes use a lens substrate containing an ultraviolet (UV) absorber. For eyeglass lenses with a UV absorber-containing lens substrate, the amount of UV radiation reaching the wearer's eyes can be reduced by the lens substrate. Therefore, it has not been conventional to provide a functional film that highly reflects UV radiation as a functional film on the object-side surface of the lens substrate. On the other hand, UV radiation contained in sunlight (hereinafter referred to as "sunlight UV") is in the wavelength range of 290 nm or higher. While lens substrates containing UV absorbers typically absorb almost no UV in the wavelength range of 410 nm or higher, they absorb almost 100% of the light in the wavelength range of 340 nm or lower. The inventors, after diligent research to suppress the aging appearance change of eyeglass lenses, have arrived at a solution that differs from conventional methods: providing a functional film that highly reflects UV radiation in the wavelength range of 290 nm to 340 nm on the object-side surface of the lens substrate in eyeglass lenses with a UV absorber-containing lens substrate. This reduces the amount of sunlight UV radiation reaching the lens substrate, and as a result, it is possible to suppress discoloration (i.e., changes in appearance) of the lens substrate over time due to irradiation by sunlight UV radiation. Even more surprisingly, it has been newly discovered that by providing a functional film that highly reflects ultraviolet light in the wavelength range of 290 nm to 340 nm on the object-side surface of a lens substrate containing an ultraviolet absorber, it is possible to improve the wear resistance of eyeglass lenses over time. The inventors surmise that this is because the functional film that highly reflects ultraviolet light in the wavelength range of 290 nm to 340 nm on the object-side surface can suppress the deterioration of eyeglass lenses over time. However, the present invention is not limited to the surmise described herein.

[0007] In other words, one aspect of the present invention is as follows: [1] An eyeglass lens comprising a lens substrate and a multilayer film located on the object-side surface of the lens substrate, wherein the lens substrate contains an ultraviolet absorber and the average reflectance of the object-side surface of the eyeglass lens in the wavelength range of 290 nm to 340 nm is 70.0% or more. [2] The eyeglass lens according to [1], wherein the ultraviolet absorber is a benzotriazole compound. [3] The eyeglass lens according to [1] or [2], wherein the luminous reflectance of the object-side surface of the eyeglass lens is 1.50% or less. [4] The eyeglass lens according to any one of [1] to [3], wherein the dominant wavelength of the object-side surface of the eyeglass lens is 380 nm to 660 nm. [5] The eyeglass lens according to any one of [1] to [4], wherein the x-coordinate in the xy chromaticity diagram of the reflected color of the object-side surface of the eyeglass lens is in the range of 0.28 to 0.38 and the y-coordinate is in the range of 0.28 to 0.38. [6] An eyeglass lens according to any one of [1] to [5], wherein the ultraviolet absorber is a benzotriazole compound, the luminous reflectance of the object-side surface of the eyeglass lens is 1.50% or less, the dominant wavelength of the object-side surface of the eyeglass lens is 380 nm or more and 660 nm or less, and the x-coordinate of the reflected color of the object-side surface of the eyeglass lens in the xy chromaticity diagram is in the range of 0.28 to 0.38 and the y-coordinate is in the range of 0.28 to 0.38. [7] Eyeglasses equipped with an eyeglass lens according to any one of [1] to [6].

[0008] According to one aspect of the present invention, it is possible to provide eyeglass lenses that undergo little change in appearance over time. Furthermore, according to one aspect of the present invention, it is possible to provide eyeglasses equipped with the above-mentioned eyeglass lenses.

[0009] The definitions of terms and / or measurement methods used in this invention and specification are described below.

[0010] The "object-side surface" is the surface that faces the object when eyeglasses with lenses are worn by the wearer. The "eyeball-side surface" is the opposite surface, that is, the surface that faces the eyeball when eyeglasses with lenses are worn by the wearer.

[0011] The reflectance measured on the surface of an eyeglass lens is the reflectance to light directly incident on that surface. Reflectance measurements can be performed, for example, in increments of 1 to 5 nm. Furthermore, the average reflectance in a certain wavelength range is the arithmetic mean of the reflectances obtained in that wavelength range. Therefore, the average reflectance of the object-side surface of an eyeglass lens in the wavelength range of 290 nm to 340 nm is the arithmetic mean of the reflectances obtained in the wavelength range of 290 nm to 340 nm. Regarding the angle of incidence of light incident on the surface to be measured, the angle of incidence of directly incident light is strictly speaking 0°. However, from the viewpoint of the measuring optical system, some reflectance meters may use incident light with an incidence angle of about 0° to 5° as directly incident light. Such cases are also included in the definition of "direct incidence" in this invention and specification. Furthermore, some reflectance meters may be affected by multiple reflections between the surface to be measured and the opposing surface. In such cases, multiple reflections may be suppressed by applying a treatment to the opposing surface to absorb or scatter light rays (e.g., black coating).

[0012] "Luminous reflectance" is a value measured in accordance with JIS T 7334:2011. The luminous reflectance measured on the object-facing surface of an eyeglass lens is the luminous reflectance determined for light directly incident on that surface. Direct incident light is as described above.

[0013] "Dominant wavelength" is an index that quantifies the wavelength of light color perceived by the human eye. In the present invention and this specification, "dominant wavelength" is the value measured from the surface side of the spectacle lens in accordance with Annex JA of JIS Z 8781-3:2016.

[0014] The "xy chromaticity diagram" refers to the xy chromaticity diagram of the CIE (International Commission on Illumination) 1931 color space. The x and y coordinates in the xy chromaticity diagram of the reflected color of the object-side surface of the eyeglass lens are taken as values ​​at a viewing angle of 2° under the CIE standard light source D65. Hereafter, the x and y coordinates in the xy chromaticity diagram will also be referred to simply as the x and y coordinates.

[0015] The term "film thickness" as used herein refers to physical film thickness. Film thickness can be determined by known film thickness measurement methods. For example, film thickness can be determined by converting the optical film thickness measured by an optical film thickness measuring instrument to a physical film thickness.

[0016] [Eyeglass Lenses] Below, an eyeglass lens according to one aspect of the present invention will be described in more detail.

[0017] <Average reflectance of the object-side surface of the spectacle lens in the wavelength range of 290 nm to 340 nm> In the above spectacle lens, from the viewpoint of suppressing changes in the appearance of the spectacle lens over time, the average reflectance of the object-side surface of the spectacle lens in the wavelength range of 290 nm to 340 nm is preferably 70.0% or more, preferably 72.0% or more, and more preferably 74.0% or more, 76.0% or more, 78.0% or more, 80.0% or more, 82.0% or more, and 84.0% or more. Furthermore, from the viewpoint of improving the wear resistance of the spectacle lens over time, it is also preferable that the average reflectance of the object-side surface of the spectacle lens in the wavelength range of 290 nm to 340 nm is within the above range. The average reflectance of the object-facing surface of the spectacle lens in the wavelength range of 290 nm to 340 nm can be, for example, 100.0% or less, less than 100.0%, 99.0% or less, 97.0% or less, 95.0% or less, 93.0% or less, or 91.0% or less. From the viewpoint of suppressing changes in the appearance of the spectacle lens over time, a higher average reflectance of the object-facing surface of the spectacle lens in the wavelength range of 290 nm to 340 nm is preferable. Furthermore, from the viewpoint of improving the wear resistance of the spectacle lens over time, a higher average reflectance of the object-facing surface of the spectacle lens in the wavelength range of 290 nm to 340 nm is also preferable.

[0018] In the above-mentioned spectacle lens, the average reflectance of the surface facing the eyeball in the wavelength range of 290 nm to 340 nm may be within the above range or outside the above range.

[0019] <Visual Reflectance of the Object-Facing Surface of the Eyeglass Lens> In one embodiment, the visual reflectance of the object-facing surface of the eyeglass lens can be 1.50% or less. A visual reflectance of 1.50% or less of the object-facing surface of the eyeglass lens is preferable from the viewpoint of improving the appearance quality of the eyeglass lens. The visual reflectance of the object-facing surface of the eyeglass lens can be, for example, 1.40% or less, 1.30% or less, 1.20% or less, 1.10% or less, 1.00% or less, 0.99% or less, or 0.98% or less. The visual reflectance of the object-facing surface of the eyeglass lens can be, for example, 0.05% or more, 0.10% or more, 0.30% or more, or 0.50% or more. However, from the viewpoint of improving the appearance quality of the eyeglass lens, a low visual reflectance of the object-facing surface of the eyeglass lens is preferable. Therefore, the visual reflectance of the object-facing surface of the eyeglass lens may be below the above range.

[0020] In the above-mentioned spectacle lens, the luminous reflectance of the surface facing the eyeball may be within the above range or outside the above range.

[0021] <Dominant wavelength of the object-side surface of the spectacle lens> In one embodiment, the dominant wavelength of the object-side surface of the spectacle lens can be 380 nm or more, and can also be 400 nm or more, 420 nm or more, 440 nm or more, 460 nm or more, 480 nm or more, 482 nm or more, or 485 nm or more. Alternatively, the dominant wavelength of the object-side surface of the spectacle lens can be 660 nm or less, and can also be 640 nm or less, 620 nm or less, 600 nm or less, 580 nm or less, and can also be 579 nm or less or 578 nm or less. It is also preferable from the viewpoint of improving the appearance quality of the spectacle lens that the dominant wavelength of the object-side surface of the spectacle lens is within the above range.

[0022] In the above-described spectacle lens, the dominant wavelength on the surface facing the eyeball may be within the above range or outside the above range.

[0023] <x and y coordinates of the reflected color on the object-side surface> In one embodiment, the x coordinate of the reflected color on the object-side surface of the eyeglass lens can be in the range of 0.28 to 0.38. It is also preferable from the viewpoint of improving the appearance quality of the eyeglass lens that the x coordinate of the reflected color on the object-side surface of the eyeglass lens is within the above range.

[0024] In one embodiment, the y-coordinate of the reflected color on the object-side surface of the spectacle lens may be in the range of 0.28 to 0.38. It is also preferable from the viewpoint of improving the appearance quality of the spectacle lens that the y-coordinate of the reflected color on the object-side surface of the spectacle lens falls within the above range.

[0025] In one embodiment, the x-coordinate of the reflected color on the object-side surface of the spectacle lens may be in the range of 0.28 to 0.38, and the y-coordinate may be in the range of 0.28 to 0.38.

[0026] In the above spectacle lens, the x-coordinate and y-coordinate of the reflected color on the eyeball-side surface may be within or outside the above range.

[0027] The various physical properties described above, measured on each of the object-side surface and the eyeball-side surface of the spectacle lens, can be adjusted, for example, by the design of the multilayer film provided on each surface of the spectacle lens. The design of the multilayer film can be determined, for example, by optical simulation using a known method.

[0028] <Lens Substrate> The lens substrate included in the above-mentioned eyeglass lenses is not particularly limited as long as it contains an ultraviolet absorber. The lens substrate can be a plastic lens substrate or a glass lens substrate. A glass lens substrate can be, for example, a lens substrate made of inorganic glass. As a lens substrate, a plastic lens substrate is preferred from the viewpoint of being lightweight, less prone to breakage, and easy to introduce an ultraviolet absorber. Examples of plastic lens substrates include (meth)acrylic resin, styrene resin, polycarbonate resin, allyl resin, allyl carbonate resin such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resin, polyester resin, polyether resin, urethane resin obtained by the reaction of an isocyanate compound with a hydroxyl compound such as diethylene glycol, thiourethane resin obtained by the reaction of an isocyanate compound with a polythiol compound, and cured products obtained by curing polymerizable compositions containing a (thio)epoxy compound having one or more sulfide groups and / or disulfide bonds in the molecule (generally called episulfide resins). A polymerizable composition is a composition containing one or more polymerizable compounds and can also be called a curable composition. Polymerizable compounds are compounds that have one or more polymerizable groups (generally called "polymerizable groups") in a single molecule.

[0029] The lens substrate may be undyed (colorless lens) or dyed (dyed lens). The refractive index of the lens substrate can be, for example, about 1.50 to 1.76. However, the refractive index of the lens substrate is not limited to the above range, and may be within the above range or outside of it. In the present invention and this specification, refractive index refers to the refractive index for light with a wavelength of 500 nm. Furthermore, the lens substrate may be a lens with refractive power (so-called prescription lens) or a lens without refractive power (so-called non-prescription lens).

[0030] The above spectacle lens may be any of various lenses including single-focus lenses, multifocal lenses, and progressive power refraction lenses. The type of lens is generally determined by the surface shapes on both sides of the lens base material. In addition, the surface of the lens base material may be convex, concave, or planar. For conventional lens base materials and spectacle lenses, the object-side surface is convex and the eyeball-side surface is concave. However, the present invention is not limited thereto.

[0031] (Ultraviolet Absorber) In the present invention and the present specification, the term "ultraviolet absorber" refers to a compound that has absorption at at least one wavelength in the wavelength range from 290 nm to 340 nm inclusive, or in at least a part of said wavelength range. Examples of the ultraviolet absorber include various compounds such as benzotriazole compounds, benzophenone compounds, triazine compounds, and indole compounds. Preferred ultraviolet absorbers include benzotriazole compounds and indole compounds; more preferred ultraviolet absorbers include benzotriazole compounds and benzophenone compounds; and even more preferred ultraviolet absorbers include benzotriazole compounds.

[0032] Examples of benzophenone compounds include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, and the like.

[0033] In the present invention and this specification, "benzotriazole compound" means a compound having a benzotriazole ring. Examples of benzotriazole compounds include 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chloro-2H-benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chloro-2H-benzotriazole, 2-(2-hydroxy-3,5-di-tert-amylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-tert-butylphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole, and 2-(2-hydroxy-4-octyloxyphenyl)-2H-benzotriazole.

[0034] Furthermore, examples of benzotriazole compounds include the benzotriazole compound represented by the following formula (1) and the benzotriazole compound represented by the following formula (2).

[0035]

[0036] In formula (1), X represents a group that imparts a resonance effect. The substitution position of X is preferably the 5th position of the triazole ring. Examples of X include chlorine, bromine, fluorine, iodine, sulfo, carboxyl, nitrile, alkoxy, hydroxyl, and amino groups. Among these, chlorine, bromine, and fluorine atoms are preferred, with chlorine atoms being more preferred.

[0037] In equation (1), R ２ represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms, where the alkyl group and alkoxy group each preferably have 1 to 8 carbon atoms, more preferably 2 to 8 carbon atoms, and even more preferably 4 to 8 carbon atoms. The alkyl group and alkoxy group may be branched or linear. Among the alkyl and alkoxy groups, alkyl groups are preferred.

[0038] Examples of alkyl groups include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, n-octyl group, 1,1,3,3-tetramethylbutyl group, nonyl group, decyl group, undecyl group, dodecyl group, etc. Among these, at least one selected from n-propyl group, iso-propyl group, n-butyl group, sec-butyl group, tert-butyl group, and 1,1,3,3-tetramethylbutyl group is preferred, n-butyl group, sec-butyl group, tert-butyl group, and 1,1,3,3-tetramethylbutyl group are more preferred, and tert-butyl group is even more preferred.

[0039] Examples of alkoxy groups include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, nonyloxy, decyloxy, undecyloxy, and dodecyloxy groups, among which the butoxy or ethoxy group is preferred. In formula (1), R ２ The preferred substitution position is at the 3rd, 4th, or 5th position relative to the substitution position of the benzotriazolyl group.

[0040] In equation (1), R １ R represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, and specific examples of these include R ２ Among the examples listed above, those with a suitable number of carbon atoms are included. Of these, methyl or ethyl groups are preferred.

[0041] In equation (1), m represents either 0 or 1.

[0042] In equation (1), R １ The preferred substitution position is at position 5, relative to the substitution position of the benzotriazolyl group.

[0043] n is R ３ This represents the valence, which is either 1 or 2.

[0044] In equation (1), R ３represents a hydrogen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms. When n is 1, R ３ represents a hydrogen atom, and when n is 2, it represents a divalent hydrocarbon group having 1 to 8 carbon atoms.

[0045] R ３ Examples of the hydrocarbon group represented by include an aliphatic hydrocarbon group and an aromatic hydrocarbon group. The hydrocarbon group represented by R ３ has 1 to 8 carbon atoms, and preferably 1 to 3 carbon atoms. The divalent hydrocarbon group represented by R ３ includes methanediyl group, ethanediyl group, propanediyl group, benzenediyl group, toluenediyl group, etc. Among these, methanediyl group is preferable.

[0046] In formula (1), the substitution position of R ３ is preferably position 3 based on the substitution position of the benzotriazolyl group.

[0047] R ３ is preferably a hydrogen atom, and in this case n is 1.

[0048] As one embodiment of the benzotriazole compound represented by formula (1), mention may be made of the benzotriazole compound represented by the following formula (1-1).

[0049]

[0050] In formula (1-1), R １ , R ２ and m each have the same definitions as above, and the examples and preferred embodiments are also the same as those described above.

[0051] Specific examples of benzotriazole compounds represented by formula (1) include methylenebis[3-(5-chloro-2-benzotriazolyl)-5-(1,1,3,3-tetramethylbutyl)-2-hydroxyphenyl], methylenebis[3-(5-chloro-2-benzotriazolyl)-5-(tert-butyl)-2-hydroxyphenyl], methylenebis[3-(5-chloro-2-benzotriazolyl)-5-tert-butyl-2-hydroxyphenyl], and Methylenebis[3-(5-chloro-2-benzotriazolyl)-5-tert-butyl-2-hydroxyphenyl]. Lenbis[3-(5-chloro-2-benzotriazolyl)-5-tert-butyl-2-hydroxyphenyl], methylenebis[3-(5-chloro-2-benzotriazolyl)-5-ethoxy-2-hydroxyphenyl], phenylenbis[3-(5-chloro-2-benzotriazolyl)-5-(1,1,3,3-tetramethylbutyl)-2-hydroxyphenyl], and the following specific examples of benzotriazole compounds represented by formula (1-1) are listed below.

[0052] Specific examples of benzotriazole compounds represented by formula (1-1) include 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chloro-2H-benzotriazole, 2-(3-tert-butyl-2-hydroxy-5-ethylphenyl)-5-chloro-2H-benzotriazole, 5-chloro-2-(3,5-dimethyl-2-hydroxyphenyl)-2H-benzotriazole, 5-chloro-2-(3,5-diethyl-2-hydroxyphenyl)-2H-benzotriazole, 5-chloro-2-(2-hydroxy-4-methoxyphenyl)-2H-benzotriazole, 5-chloro-2-(4-ethoxy-2-hydroxyphenyl)-2H-benzotriazole, 2-(4-butoxy-2-hydroxyphenyl)-5-chloro-2H-benzotriazole, and 5-chloro-2-(2-hydroxy-4-octyloxyphenyl)-2H-benzotriazole.

[0053] Among the above, 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chloro-2H-benzotriazole, 2-(3-tert-butyl-2-hydroxy-5-ethylphenyl)-5-chloro-2H-benzotriazole, 5-chloro-2-(4-ethoxy-2-hydroxyphenyl)-2H-benzotriazole, and 2-(4-butoxy-2-hydroxyphenyl)-5-chloro-2H-benzotriazole are preferred.

[0054]

[0055] In Equation 2, R 1 R represents an alkoxy group having 1 to 20 carbon atoms. 2 R represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms. 3 n represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms, n is 1 or 2, and m is an integer in the range of 0 to 2.

[0056] Specific examples of benzotriazole compounds represented by formula (2) include 2-ethylhexyl 2-(2-hydroxy-4-methoxyphenyl)2H-benzotriazole-5-carboxylate, 2-ethylhexyl 2-(2-hydroxy-4-ethoxyphenyl)2H-benzotriazole-5-carboxylate, 2-ethylhexyl 2-(2-hydroxy-4-octyloxyphenyl)2H-benzotriazole-5-carboxylate, methyl 2-(2-hydroxy-4-methoxyphenyl)2H-benzotriazole-5-carboxylate, methyl 2-(2-hydroxy-4-ethoxyphenyl)2H-benzotriazole-5-carboxylate, ethyl 2-(2-hydroxy-4-methoxyphenyl)2H-benzotriazole-5-carboxylate, and ethyl Examples include 2-(2-hydroxy-4-ethoxyphenyl)2H-benzotriazole-5-carboxylate, ethyl 2-(2-hydroxy-4-octyloxyphenyl)2H-benzotriazole-5-carboxylate, n-octyl 2-(2-hydroxy-4-methoxyphenyl)2H-benzotriazole-5-carboxylate, n-octyl 2-(2-hydroxy-4-ethoxyphenyl)2H-benzotriazole-5-carboxylate, and n-octyl 2-(2-hydroxy-4-octyloxyphenyl)2H-benzotriazole-5-carboxylate.

[0057] The above lens substrate may contain, for example, 0.05 parts by mass or more, 0.10 parts by mass or more, or 0.30 parts by mass or more of ultraviolet absorber per 100 parts by mass of the resin (or polymerizable compound for obtaining the resin) constituting the lens substrate. The content of ultraviolet absorber in the above lens substrate may be, for example, 5.00 parts by mass or less, 4.00 parts by mass or less, or 3.00 parts by mass or less per 100 parts by mass of the resin (or polymerizable compound for obtaining the resin) constituting the lens substrate. The above lens substrate may contain only one type of ultraviolet absorber, or two or more types in any proportion. The same applies to the content of various components in the present invention and this specification.

[0058] Known methods can be used to manufacture lens substrates containing ultraviolet absorbers. For example, in a method of obtaining lens substrates as molded articles in the shape of lenses by curing a polymerizable composition, a lens substrate containing an ultraviolet absorber can be obtained by adding an ultraviolet absorber to the polymerizable composition. Alternatively, an ultraviolet absorber can be introduced into a lens substrate by various wet or dry methods commonly used as dyeing methods for lens substrates. For example, one example of a wet method is the dipping method, and one example of a dry method is the sublimation dyeing method.

[0059] In addition to the ultraviolet absorber, the lens substrate of the above-mentioned eyeglass lens may further contain one or more known additives commonly used in lens substrates for eyeglass lenses.

[0060] <Multilayer coating> The above spectacle lens has a multilayer coating on the object-facing surface of the lens substrate. The above spectacle lens may or may not have a multilayer coating on the eye-facing surface of the lens substrate. If the lens substrate also has a multilayer coating on the eye-facing surface, the multilayer coating located on the object-facing surface of the lens substrate and the multilayer coating located on the eye-facing surface may be the same multilayer coating or different multilayer coatings.

[0061] The multilayer film may be located directly on the surface of the lens substrate, or it may be located indirectly on the surface of the lens substrate via one or more other layers. Examples of layers that can be formed between the lens substrate and the multilayer film include a polarizing layer, a photochromic layer, and a hard coat layer. Providing a hard coat layer can increase the durability (strength) of the spectacle lens. The hard coat layer may be, for example, a cured layer obtained by curing a polymerizable composition. For details of the hard coat layer, see, for example, paragraphs 0025 to 0028 and 0030 of Japanese Patent Application Publication No. 2012-128135. In addition, a primer layer may be formed between the lens substrate and the multilayer film to improve adhesion. For details of the primer layer, see, for example, paragraphs 0029 to 0030 of Japanese Patent Application Publication No. 2012-128135.

[0062] As a method for forming a multilayer film, known film formation methods can be used. From the viewpoint of ease of film formation, it is preferable to perform film formation by vapor deposition. That is, it is preferable that each layer included in the multilayer film be a vapor-deposited film. A vapor-deposited film means a film formed by vapor deposition. In the present invention and this specification, "vapor deposition" includes dry methods, such as vacuum deposition, ion plating, and sputtering. In vacuum deposition, an ion beam-assisted method in which an ion beam is simultaneously irradiated during deposition may be used.

[0063] A multilayer film may have a laminated structure in which high-refractive-index layers and low-refractive-index layers are alternately stacked. In this invention and specification, "high" and "low" in relation to "high-refractive-index" and "low-refractive-index" are relative terms. That is, a high-refractive-index layer is a layer with a higher refractive index than a low-refractive-index layer included in the same multilayer film. In other words, a low-refractive-index layer is a layer with a lower refractive index than a high-refractive-index layer included in the same multilayer film. The refractive index of a high-refractive-index layer can be, for example, 1.60 or higher (for example, in the range of 1.60 to 2.60), and the refractive index of a low-refractive-index layer can be, for example, 1.59 or lower (for example, in the range of 1.37 to 1.59). However, as stated above, since the terms "high" and "low" in relation to high-refractive-index and low-refractive-index are relative, the refractive indices of high-refractive-index materials and low-refractive-index materials are not limited to the above ranges. Furthermore, a multilayer film may contain three or more layers with different refractive indices.

[0064] As the high refractive index material constituting the high refractive index layer and the low refractive index material constituting the low refractive index layer, inorganic materials, organic materials, or organic-inorganic composite materials can be used, and inorganic materials are preferred from the viewpoint of film formation properties, etc. That is, the multilayer film is preferably an inorganic multilayer film. Specifically, as the high refractive index material for forming the high refractive index layer, zirconium oxide (e.g., ZrO) ２ ), tantalum oxide (Ta ２ O ５ ), titanium oxide (e.g., TiO ２ ), aluminum oxide (Al ２ O ３ ), yttrium oxide (e.g., Y ２ O ３ ), hafnium oxide (e.g., HfO ２ ), and niobium oxide (e.g., Nb ２ O ５ Examples of low refractive index materials for forming a low refractive index layer include silicon oxide (e.g., SiO ２ ), magnesium fluoride (e.g., MgF ２ ) and barium fluoride (e.g., BaF ２Examples include one or more oxides or fluorides selected from the group consisting of ). In the above examples, for convenience, oxides and fluorides are shown in terms of stoichiometric composition, but those with oxygen or fluorine deficiencies or excesses in their stoichiometric composition can also be used as high-refractive-index materials or low-refractive-index materials.

[0065] Preferably, the high refractive index layer is a film mainly composed of a high refractive index material, and the low refractive index layer is a film mainly composed of a low refractive index material. Here, the main component is the component that makes up the largest amount in the film, and is usually a component that accounts for about 50% to 100% by mass, and more specifically, about 90% to 100% by mass, of the mass of the film. Such a film (e.g., a vapor deposition film) can be formed by performing film formation using a film-forming material (e.g., a vapor deposition source) mainly composed of the above high refractive index material or low refractive index material. The same applies to the main component of the film-forming material. The film and film-forming material may contain impurities that are inevitably mixed in, and may also contain other components, such as other inorganic substances or known additives that play a role in assisting film formation, to the extent that they do not impair the function performed by the main component. Film formation can be performed by known film-forming methods, and from the viewpoint of ease of film formation, it is preferable to perform it by vapor deposition.

[0066] The total number of high-refractive-index and low-refractive-index layers in a multilayer film can be, for example, three or more, four or more, or five or more. Alternatively, the total number of high-refractive-index and low-refractive-index layers in a multilayer film can be, for example, 15 or fewer, 14 or fewer, 13 or fewer, 12 or fewer, 11 or fewer, or 10 or fewer. The film thickness of the high-refractive-index layer and the low-refractive-index layer can be determined according to the layer configuration. Specifically, the combination of layers included in the multilayer film, and the film thickness of each layer, can be determined by optical simulation using known methods, based on the refractive index of the film-forming material for creating the high-refractive-index and low-refractive-index layers, and the various physical properties that the multilayer film is intended to provide to the spectacle lens.Regarding the arrangement of high-refractive-index and low-refractive-index layers in a multilayer film, for example, from the lens substrate side toward the outermost surface of the lens, arrangement example 1: an arrangement in which the layers are stacked in the order of 1st layer (high-refractive-index layer) / 2nd layer (low-refractive-index layer) / 3rd layer (high-refractive-index layer) / 4th layer (low-refractive-index layer); arrangement example 2: an arrangement in which the layers are stacked in the order of 1st layer (low-refractive-index layer) / 2nd layer (high-refractive-index layer) / 3rd layer (low-refractive-index layer) / 4th layer (high-refractive-index layer) / 5th layer (low-refractive-index layer); arrangement example 3: an arrangement in which the layers are stacked in the order of 1st layer (high-refractive-index layer) / 2nd layer (low-refractive-index layer) / 3rd layer (high-refractive-index layer) / 4th layer (low-refractive-index layer) / 5th layer (high-refractive-index layer) / 6th layer (low-refractive-index layer); Arrangement Example 4: Arrangement in the order of Layer 1 (low refractive index layer) / Layer 2 (high refractive index layer) / Layer 3 (low refractive index layer) / Layer 4 (high refractive index layer) / Layer 5 (low refractive index layer) / Layer 6 (high refractive index layer); Arrangement Example 5: Arrangement in the order of Layer 1 (high refractive index layer) / Layer 2 (low refractive index layer) / Layer 3 (high refractive index layer) / Layer 4 (low refractive index layer) / Layer 5 (high refractive index layer) / Layer 6 (low refractive index layer) / Layer 7 (high refractive index layer); Arrangement Example 6: Arrangement in the order of Layer 1 (high refractive index layer) / Layer 2 (low refractive index layer) / Layer 3 (high refractive index layer) / Layer 4 (low refractive index layer) / Layer 5 (high refractive index layer) / Layer 6 (low refractive index layer) / Layer 7 (high refractive index layer) / Layer 8 (low refractive index layer); Arrangement Example 7: Arrangement stacked in the following order: 1st layer (low refractive index layer) / 2nd layer (high refractive index layer) / 3rd layer (low refractive index layer) / 4th layer (high refractive index layer) / 5th layer (low refractive index layer) / 6th layer (high refractive index layer) / 7th layer (low refractive index layer) / 8th layer (high refractive index layer) / 9th layer (low refractive index layer); Arrangement Example 8: Arrangement stacked in the following order: 1st layer (high refractive index layer) / 2nd layer (low refractive index layer) / 3rd layer (high refractive index layer) / 4th layer (low refractive index layer) / 5th layer (high refractive index layer) / 6th layer (low refractive index layer) / 7th layer (high refractive index layer) / 8th layer (low refractive index layer) / 9th layer (high refractive index layer); An example of a configuration 9 is one in which layers are stacked in the following order: 1st layer (low refractive index layer) / 2nd layer (high refractive index layer) / 3rd layer (low refractive index layer) / 4th layer (high refractive index layer) / 5th layer (low refractive index layer) / 6th layer (high refractive index layer) / 7th layer (low refractive index layer) / 8th layer (high refractive index layer) / 9th layer (low refractive index layer) / 10th layer (low refractive index layer); and so on.Furthermore, examples include configurations that include three layers with different refractive indices (a high refractive index layer, a low refractive index layer, and a layer with a refractive index lower than the high refractive index layer but higher than the low refractive index layer (a medium refractive index layer)). In the above examples of layer configurations, the notation " / " is used to encompass both the case where the layer to the left of " / " and the layer to the right of " / " are in direct contact, and the case where a conductive oxide layer, described later, exists between the layer to the left of " / " and the layer to the right of " / ". For example, a conductive oxide layer, described later, may exist between the 8th layer (high refractive index layer) and the 9th layer (low refractive index layer) in arrangement example 7, and / or between the 9th layer (low refractive index layer) and the 10th layer (low refractive index layer) in arrangement example 9. However, the layer configuration of the multilayer film located on the object-side surface of the lens substrate in the above eyeglass lens is not limited to the above arrangement examples.

[0067] Preferred specific examples of combinations of low-refractive-index layers and high-refractive-index layers included in a multilayer film include: a combination of a layer mainly composed of silicon oxide (silicon oxide layer; low-refractive-index layer) and a layer mainly composed of zirconium oxide (zirconium oxide layer; high-refractive-index layer); a combination of a layer mainly composed of silicon oxide (silicon oxide layer; low-refractive-index layer) and a layer mainly composed of niobium oxide (niobium oxide layer; high-refractive-index layer); a combination of a layer mainly composed of silicon oxide (silicon oxide layer; low-refractive-index layer) and a layer mainly composed of tantalum oxide (tantalum oxide layer; high-refractive-index layer); a combination of a layer mainly composed of silicon oxide (silicon oxide layer; low-refractive-index layer) and a layer mainly composed of titanium oxide (titanium oxide layer; high-refractive-index layer), and so on. A multilayer film including at least one laminated structure in which two of the above combinations are in direct contact, or in which a conductive oxide layer described later exists between the two of the above combinations, can be exemplified as an example of a multilayer film. Furthermore, a multilayer film having the above-mentioned combination of a low refractive index layer and a high refractive index layer, and including an aluminum oxide layer as a medium refractive index layer, can also be exemplified as a preferred example.

[0068] The film thickness of each layer, such as the high-refractive-index layer and the low-refractive-index layer, included in the multilayer film can be, for example, 0.5 nm to 500 nm, or 10 nm to 300 nm. The total thickness of the multilayer film located on the object-side surface of the lens substrate can be, for example, 100 nm to 900 nm, or 100 nm to 600 nm.

[0069] In addition to the high-refractive-index and low-refractive-index layers described above, the multilayer film may also include one or more layers of conductive oxide (conductive oxide layer), preferably one or more deposited conductive oxide films formed by deposition using a deposition source primarily composed of conductive oxide, at any position in the multilayer film. The same applies to the main components described for the conductive oxide layer. From the viewpoint of transparency of the spectacle lens, preferred conductive oxide layers include indium tin oxide (tin-dope indium oxide; ITO) layers with a thickness of 10 nm or less, tin oxide layers with a thickness of 10 nm or less, and titanium oxide layers with a thickness of 10 nm or less. The indium tin oxide (ITO) layer is a layer containing ITO as its main component. The same applies to the tin oxide layer and titanium oxide layer. By including a conductive oxide layer in the multilayer film, it is possible to prevent the spectacle lens from becoming charged and attracting dust and dirt. In the present invention and this specification, the "high refractive index layer" and "low refractive index layer" included in the multilayer film do not include indium tin oxide (ITO) layers with a thickness of 10 nm or less, tin oxide layers with a thickness of 10 nm or less, and titanium oxide layers with a thickness of 10 nm or less. That is, even if one or more of these layers are included in the multilayer film, these layers shall not be considered as "high refractive index layers" or "low refractive index layers." The thickness of the above conductive oxide layer with a thickness of 10 nm or less may be, for example, 0.1 nm or more.

[0070] Furthermore, additional functional films can be formed on the multilayer film. Examples of such functional films include various functional films such as water-repellent or hydrophilic antifouling films and anti-fogging films. Known technologies can be applied to all of these functional films.

[0071] [Eyeglasses] A further aspect of the present invention relates to eyeglasses equipped with eyeglass lenses according to one aspect of the present invention described above. Details of the eyeglass lenses included in these eyeglasses are as previously described. By being equipped with such eyeglass lenses, the above eyeglasses can maintain a good appearance even after a long period of time, and can also exhibit excellent wear resistance even after a long period of time. There are no particular restrictions on the structure of the eyeglasses, such as the frame, and known technologies can be applied.

[0072] The present invention will be further described below with reference to examples. However, the present invention is not limited to the embodiments shown in the examples.

[0073] [Lens Substrate] Details of the plastic lens substrates used as the substrates for each spectacle lens in the examples and comparative examples are as follows. Each lens substrate contains 2.80 parts by mass of 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole as an ultraviolet absorber, per 100 parts by mass of the resin constituting the plastic lens substrate. The plastic lens substrate with a refractive index of 1.50 is an allyl carbonate resin substrate into which the ultraviolet absorber has been introduced by the dip method. The plastic lens substrate with a refractive index of 1.60 is a thiourethane resin substrate containing an ultraviolet absorber. The plastic lens substrate with a refractive index of 1.74 is an episulfide resin substrate containing an ultraviolet absorber.

[0074] [Examples 1-20, Comparative Examples 1 and 2] A multilayer vapor-deposited film with the layer structure shown in the table below was formed on the hard-coated convex (object side) and concave (eyeball side) surfaces of a plastic lens substrate, which had both sides optically finished and pre-hard-coated, with the object-side surface being convex and the eyeball-side surface being concave, by ion-assisted vapor deposition using oxygen gas and argon gas as assist gases. In each example, the multilayer vapor-deposited film was formed by sequentially using the vapor deposition sources shown in the table below, from the lens substrate side (hard-coated side) toward the surface side of the spectacle lens, in the order of the first layer, second layer, etc., until the outermost layer on the surface side of the spectacle lens was formed by the vapor deposition source shown in the bottom column of the table below. In these examples and comparative examples, vapor deposition sources consisting of oxides shown in the table below were used, excluding impurities that may inevitably be mixed in, and each layer with the physical thickness shown in the table below was formed sequentially. The refractive index of each layer is within the range shown in the table below. As described above, spectacle lenses having multilayer vapor-deposited films on both the object-side and eye-side surfaces of the lens substrate were obtained. For each of Examples 1 to 8 and Comparative Examples 1 and 2, three spectacle lenses were prepared. One was used for the "Measurement of various physical properties of the object-side surface of the spectacle lens" described below, another was used to determine the "absolute value of ΔYI after 300 hours of Xe irradiation" described below, and the remaining one was used to evaluate the "wear resistance" described below. For each of Examples 9 to 20, two spectacle lenses were prepared. One was used for the "Measurement of various physical properties of the object-side surface of the spectacle lens" described below, and the other was used to determine the "absolute value of ΔYI after 300 hours of Xe irradiation" described below.

[0075] [Measurement of various physical properties of the object-side surface of eyeglass lenses] <Average reflectance of the object-side surface of eyeglass lenses in the wavelength range of 290 nm to 340 nm> The direct incident reflectance spectral characteristics at the optical center were measured on the object-side surface of each eyeglass lens in the examples and comparative examples. The measurements were performed using an Olympus USPM-RU lens reflectance meter (measurement pitch: 1 nm, measurement conditions set to direct incident). From the direct incident reflectance spectral characteristics measured above, the average reflectance of the object-side surface of the eyeglass lens in the wavelength range of 290 nm to 340 nm was determined. The obtained values ​​are shown in the table below in the column "Average reflectance of 290-340 nm".

[0076] <Luminous Reflectance and Dominant Wavelength of the Object-Facing Surface of Eyeglass Lenses> The direct incident reflectance spectral characteristics at the optical center were measured on the object-facing surface of each eyeglass lens in the examples and comparative examples. The measurements were performed using a HITACHI UH4150 spectrophotometer (measurement pitch: 1 nm, measurement conditions set to direct incident). The dominant wavelength was determined from the direct incident reflectance spectral characteristics measured above. Furthermore, the luminous reflectance of the object-facing surface of the eyeglass lens was determined from the direct incident reflectance spectral characteristics measured above, in accordance with JIS T 7334:2011. The obtained values ​​are shown in the "Luminous Reflectance" and "Dominant Wavelength" columns in the table below. In the table, the unit of luminous reflectance is "%" and the unit of dominant wavelength is "nm".

[0077] <x and y coordinates in the xy chromaticity diagram of the reflected color of the object-side surface of the eyeglass lens> The x and y coordinates in the xy chromaticity diagram of the reflected color of the object-side surface of each eyeglass lens in the examples and comparative examples were measured under the CIE standard light source D65.

[0078] [Evaluation of Eyeglass Lenses] <Absolute Value of ΔYI after 300 Hours of Xe Irradiation> For each eyeglass lens in the examples and comparative examples, the YI value specified in JIS K 7373:2006 was measured using a HITACHI UH4150 spectrophotometer. The YI value is an indicator of the degree of discoloration; a smaller value indicates less discoloration. Subsequently, a Xe weather meter was used to irradiate the object-side surface of the eyeglass lens at 320 W / m². ２ Under the specified irradiation conditions, a xenon (Xe) lamp was used as the light source for 300 hours of xenon light irradiation. The YI value of the spectacle lenses after the above xenon light irradiation was measured using the method described above. In the table below, the column for "Absolute value of ΔYI after 300 hours of Xe irradiation" shows the absolute value of the difference (ΔYI) between the YI value before and after xenon light irradiation. Since xenon light has wavelength characteristics similar to sunlight, spectacle lenses with a small change in YI value (i.e., an absolute value of ΔYI) after xenon light irradiation can be determined to be spectacle lenses that undergo little change in appearance due to exposure to sunlight over time.

[0079] <Abrasion Resistance> For each eyeglass lens in the examples and comparative examples, an accelerated weathering tester using an ultraviolet fluorescent tube (manufactured by Q-Lab) was used, applying 0.20 W / m towards the object-side surface of the eyeglass lens. ２ Under the specified irradiation conditions, a UVA-340 lamp was used as the light source for 168 hours of light irradiation. The abrasion resistance of the spectacle lenses after the above light irradiation was evaluated using the following method. Steel wool #0000 (manufactured by Nippon Steel Wool Co., Ltd.) with a load of 1 kg was passed back and forth 20 times on the object-side surface of the spectacle lens, and the resistance to scratching of the object-side surface of the spectacle lens was visually determined. The evaluation criteria were as follows: Since light has wavelength characteristics similar to sunlight, spectacle lenses that are resistant to scratching after light irradiation can be judged to be spectacle lenses with excellent abrasion resistance over time. ○: 0 scratches (no scratches) △: More than 1 but 4 or less scratches (slight scratches) ×: 5 or more scratches, or the entire surface is cloudy (scratches)

[0080]

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[0091] From the above results, it can be confirmed that eyeglass lenses with an average reflectivity of 70.0% or higher in the wavelength range of 290 nm to 340 nm on the surface facing the object are eyeglass lenses that show little change in appearance over time. Furthermore, from the evaluation results of abrasion resistance, it can also be confirmed that eyeglass lenses with an average reflectivity of 70.0% or higher in the wavelength range of 290 nm to 340 nm on the surface facing the object are eyeglass lenses that show little decrease in abrasion resistance over time.

[0092] The various embodiments described herein can be combined in any combination of two or more.

[0093] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the claims rather than the foregoing description, and all modifications within the meaning and scope of equivalents of the claims are intended.

[0094] This invention is useful in the field of manufacturing eyeglass lenses and eyeglasses.

Claims

1. An eyeglass lens comprising a lens substrate and a multilayer film located on the object-facing surface of the lens substrate, wherein the lens substrate contains an ultraviolet absorber and the average reflectance of the object-facing surface of the eyeglass lens in the wavelength range of 290 nm to 340 nm is 70.0% or more.

2. The spectacle lens according to claim 1, wherein the ultraviolet absorber is a benzotriazole compound.

3. The spectacle lens according to claim 1, wherein the luminous reflectance of the object-facing surface of the spectacle lens is 1.50% or less.

4. The spectacle lens according to claim 1, wherein the dominant wavelength of the object-side surface of the spectacle lens is 380 nm or more and 660 nm or less.

5. The spectacle lens according to claim 1, wherein the x-coordinate in the xy chromaticity diagram of the reflected color of the object-side surface of the spectacle lens is in the range of 0.28 to 0.38, and the y-coordinate is in the range of 0.28 to 0.

38.

6. The spectacle lens according to claim 1, wherein the ultraviolet absorber is a benzotriazole compound, the luminous reflectance of the object-side surface of the spectacle lens is 1.50% or less, the dominant wavelength of the object-side surface of the spectacle lens is 380 nm or more and 660 nm or less, and the x-coordinate of the xy chromaticity diagram of the reflected color of the object-side surface of the spectacle lens is in the range of 0.28 to 0.38 and the y-coordinate is in the range of 0.28 to 0.

38.

7. Eyeglasses equipped with eyeglass lenses according to any one of claims 1 to 6.

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