Ophthalmic lens

Abstract

The purpose of the present invention is to provide an ophthalmic lens capable of reducing photophobia among more users when worn by a visually allergic user. This ophthalmic lens contains a dye, in which the dye contains a specific dye having a maximum absorption wavelength in the wavelength range of 400-510 nm, the maximum absorption coefficient of the specific dye in the wavelength range of 550-780 nm is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength of the specific dye, and Ta represents the average transmittance of the ophthalmic lens in the wavelength range of 430-480 nm, and Ta represents the average transmittance of the ophthalmic lens in the wavelength range of 430-480 nm. In a wavelength of 430-480 nm, the transmittance of the ophthalmic lens every 5 nm is in the range of Ta + / -y, and when the average transmittance of the ophthalmic lens at a wavelength of 550-780 nm is represented by Tb, Tb is greater than Ta. Wherein y is a value represented by formula (1). In the formula (1), y = (100%-Ta) * 0.1, wherein the unit of Ta, Tb and y is%.

Description

Technical Field

[0001] The present invention relates to spectacle lenses. Background Art

[0002] In hyperesthesia, visual hyperesthesia related to vision is also called visual allergy.

[0003] Visual allergy is roughly divided into allergy to brightness and allergy to specific colors. People with visual allergy also have states such as being unable to open their eyes due to the glare of sunlight or LED lighting, the light of fluorescent lamps looking dazzling, and being unable to directly look at specific colors, and often feel inconvenient in daily life.

[0004] The above-mentioned visual allergy is considered to be caused by the different sensitivities of cone cells (S cone cells, M cone cells, and L cone cells) present in the retina from those of most people. Among them, sometimes the energy of the light (the maximum absorption wavelength of S cones: about 420 nm) that stimulates S cone cells is higher than the energy of the light that stimulates other cone cells, and it is considered that a large amount of visual allergy is caused by the stimulation of S cone cells. Therefore, it is expected to improve a part of the state of visual allergy by controlling the amount of light that stimulates S cone cells.

[0005] On the other hand, various studies have been conducted on spectacle lenses that block the light (blue light) that stimulates S cone cells. For example, Patent Document 1 discloses a spectacle lens that reflects blue light through a multilayer film.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: WO 2020 / 067407 Summary of the Invention

[0009] The present invention relates to a spectacle lens containing a pigment, wherein the pigment contains a specific pigment having a maximum absorption wavelength in the wavelength range of 400 to 510 nm, the maximum absorption coefficient of the specific pigment in the wavelength range of 550 to 780 nm is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength of the specific pigment, when the average transmittance of the spectacle lens in the wavelength range of 430 to 480 nm is set as Ta, in the wavelength range of 430 to 480 nm, the transmittance at every 5 nm is within the range of Ta±y, and when the average transmittance of the spectacle lens in the wavelength range of 550 to 780 nm is set as Tb, the Tb is greater than the Ta. Here, y is a value represented by the following formula (1).

[0010] Formula (1) y = (100% - Ta)×0.1 Brief Description of the Drawings

[0011] Figure 1 It is a cross-sectional view of an embodiment of an ophthalmic lens.

[0012] Figure 2 It is the transmission spectrum of the ophthalmic lenses of Example 1 and Comparative Example 1.

[0013] Figure 3 It is the transmission spectrum of the ophthalmic lenses of Example 2 and Comparative Example 2.

[0014] Figure 4 It is the transmission spectrum of the ophthalmic lenses of Example 3 and Comparative Example 3.

[0015] Figure 5 It is the transmission spectrum of the ophthalmic lenses of Example 4 and Comparative Example 4. Detailed Description of the Invention

[0016] Hereinafter, the ophthalmic lens of the present invention will be described in detail.

[0017] It is considered that there are individual differences in the degree of visual hypersensitivity. Regarding ophthalmic lenses, it is desired to reduce photophobia in more users when worn by users with visual hypersensitivity. The ophthalmic lens of the present invention can reduce photophobia in more users when worn by users with visual hypersensitivity.

[0018] It should be noted that in this specification, "~" is used to mean including the numerical values described before and after it as the lower limit value and the upper limit value.

[0019] In addition, in this specification, the refractive index is the refractive index under the e-line.

[0020] Figure 1 It is a cross-sectional view of an embodiment of an ophthalmic lens.

[0021] Figure 1 The ophthalmic lens 10 shown includes an ophthalmic lens substrate 12, a hard coat 14 disposed on one surface of the ophthalmic lens substrate 12, and an antireflection film 16 disposed on the side of the hard coat 14 opposite to the ophthalmic lens substrate 12 side.

[0022] In Figure 1 In the ophthalmic lens 10 shown, the ophthalmic lens substrate 12 contains a pigment. The above pigment contains a specific pigment having a maximum absorption wavelength in the wavelength range of 400 to 510 nm, and the maximum absorption coefficient of the specific pigment within the wavelength range of 550 to 780 nm is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength of the specific pigment.

[0023] In addition, regarding Figure 1Regarding the spectacle lens 10 shown, when the average transmittance within the wavelength range of 430 to 480 nm is set as Ta (unit: %), within the wavelength range of 430 to 480 nm, the transmittance of the spectacle lens at every 5 nm is within the range of Ta ± y. Herein, y (unit: %) is a value represented by the following formula (1).

[0024] Formula (1) y = (100% - Ta) × 0.1

[0025] The method for measuring the transmittance of the spectacle lens 10 will be described in detail hereinafter.

[0026] In addition, regarding Figure 1 the spectacle lens 10 shown, when the average transmittance within the wavelength range of 550 to 780 nm is set as Tb (unit: %), Tb is greater than Ta.

[0027] Satisfying the above requirements regarding transmittance means that the light within the wavelength range of 430 to 480 nm is uniformly blocked, and the transmittance in other wavelength regions (wavelength range of 550 to 780 nm) is higher than that in the wavelength range of 430 to 480 nm. By satisfying the requirements regarding transmittance of the above spectacle lens 10, blue light can be effectively blocked, and thus it is considered that photophobia can be alleviated in more users.

[0028] The spectacle lens of the present invention is not limited to Figure 1 the manner shown. For example, in Figure 1 , the spectacle lens substrate 12 and the hard coat 14 are arranged in a directly contacting manner, but it is not limited to this manner. As will be described hereinafter, other layers (such as a primer coat) can be arranged between the spectacle lens substrate 12 and the hard coat 14. That is to say, the hard coat 14 can be directly arranged on the spectacle lens substrate 12, or can be indirectly arranged on the spectacle lens substrate 12 with other layers in between. In addition, the hard coat 14 may not be arranged.

[0029] In addition, on the side of the anti-reflection film 16 opposite to the spectacle lens substrate 12 side, a water and oil repellent layer can be arranged. In addition, the anti-reflection film 16 may not be arranged.

[0030] Regarding the above other layers (such as a primer coat), the anti-reflection film, and the water and oil repellent layer, they will be described in detail hereinafter.

[0031] In addition, in Figure 1 , the hard coat 14 and the anti-reflection film 16 are arranged on one side of the spectacle lens substrate 12, but the hard coat 14 and the anti-reflection film 16 can also be arranged on both sides of the spectacle lens substrate 12. It should be noted that the above other layers and the water and oil repellent layer can also be arranged on both sides of the spectacle lens substrate 12.

[0032] In addition, in Figure 1In the manner shown, the way in which a specific pigment is contained in the spectacle lens substrate 12 is described, but the spectacle lens of the present invention is not limited to this way. In the spectacle lens of the present invention, the specific pigment can be contained in any layer. For example, it can be contained in the hard coat 14. In addition, the specific pigment can also be contained in layers not shown in the above-mentioned other layers, etc. Figure 1 The specific pigment can be contained in layers not shown in the above. It should be noted that the specific pigment can be contained in two or more components.

[0033] However, even in the case where the specific pigment is contained outside the spectacle lens substrate 12, the requirements regarding the transmittance of the above-mentioned spectacle lens 10 are satisfied.

[0034] Hereinafter, the spectacle lens of the present invention will be described in detail.

[0035] <Specific pigment>

[0036] The spectacle lens of the present invention contains a pigment, and the pigment contains a specific pigment.

[0037] The specific pigment means that it has a maximum absorption wavelength in the wavelength range of 400 to 510 nm, and the maximum extinction coefficient in the wavelength range of 550 to 780 nm is 1 / 5 or less of the extinction coefficient at the maximum absorption wavelength. By containing the specific pigment as the pigment, the spectacle lens of the present invention can easily meet the requirements regarding the transmittance of the above-mentioned spectacle lens. The requirements regarding the transmittance will be described in detail later.

[0038] The maximum absorption wavelength of the specific pigment, the extinction coefficient at the maximum absorption wavelength, and the maximum extinction coefficient in the wavelength range of 550 to 780 nm can be measured with a known spectrophotometer. For example, a spectrophotometer can be used to obtain the transmission spectrum of the pigment solution in which the specific pigment is dissolved or dispersed, and the absorbance can be obtained from the transmission spectrum.

[0039] Preferably, the maximum extinction coefficient of the specific pigment in the wavelength range of 550 to 780 nm is smaller than the extinction coefficient at the maximum absorption wavelength, for example, 1 / 5 or less, preferably 1 / 10 or less, more preferably 1 / 20 or less. Regarding the lower limit, 0 or more can be cited.

[0040] The extinction coefficient at the maximum absorption wavelength of the specific pigment is not particularly limited as long as it satisfies the above requirements regarding the extinction coefficient. For example, it is preferably 5.0×10 3 mL / (g·cm) or more, more preferably 5.0×10 4 mL / (g·cm) or more. There is no particular limitation on the upper limit of the extinction coefficient, and 1.0×10 6 mL / (g·cm) or less can be cited.

[0041] The maximum absorption coefficient of the specific pigment within the wavelength range of 550 to 780 nm is not particularly limited as long as it meets the above requirements regarding the absorption coefficient. For example, it is preferably 1.0×10 3 mL / (g·cm) or less, more preferably 5.0×10 2 mL / (g·cm) or less. The lower limit of the absorption coefficient is not particularly limited and may also be 0.

[0042] The specific pigment is not particularly limited as long as it meets the above requirements, and known pigments can be used. The specific pigment can be an inorganic substance or an organic substance. That is, the specific pigment can be an inorganic pigment (hereinafter also referred to as "specific inorganic pigment") having a maximum absorption wavelength in the wavelength range of 400 to 510 nm and a maximum absorption coefficient within the wavelength range of 550 to 780 nm that is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength, or an organic pigment (hereinafter also referred to as "specific organic pigment") having a maximum absorption wavelength in the wavelength range of 400 to 510 nm and a maximum absorption coefficient within the wavelength range of 550 to 780 nm that is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength.

[0043] In addition, the specific pigment can be soluble in water or an organic solvent, or insoluble in water or an organic solvent. That is, the specific pigment can be a dye (hereinafter also referred to as "specific dye") having a maximum absorption wavelength in the wavelength range of 400 to 510 nm and a maximum absorption coefficient within the wavelength range of 550 to 780 nm that is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength, or a pigment (hereinafter also referred to as "specific pigment") having a maximum absorption wavelength in the wavelength range of 400 to 500 nm and a maximum absorption coefficient within the wavelength range of 550 to 780 nm that is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength.

[0044] That is to say, the specific pigment can be any one of specific inorganic dyes, specific inorganic pigments, specific organic dyes, and specific organic pigments. It should be noted that specific inorganic dyes refer to substances corresponding to specific inorganic pigments and specific dyes, and specific inorganic pigments refer to substances corresponding to specific inorganic pigments and specific pigments. In addition, specific organic dyes refer to substances corresponding to specific organic pigments and specific dyes, and specific organic pigments refer to substances corresponding to specific organic pigments and specific pigments.

[0045] Among them, considering the aspect of easy manufacture of the spectacle lens containing the specific pigment, the specific pigment is preferably a specific inorganic dye or a specific organic dye, and more preferably a specific organic dye.

[0046] Specific inorganic dyes or specific organic dyes are not particularly limited as long as they meet the above requirements, and can be any dye classified as disperse dyes, reactive dyes, direct dyes, compound dyes, acid dyes, metal complex salts dyes, vat dyes, sulfur dyes, fluorescent dyes, phosphorescent dyes, dyes for resin coloring, etc.

[0047] As the specific organic dye, for example, a specific organic dye containing heteroatoms (e.g., nitrogen atoms, oxygen atoms) other than carbon atoms is preferred. As the specific organic dye, azo dyes, pyrazolone dyes, quinoline dyes, and cyanine dyes can be cited, for example.

[0048] In addition, commercially available products can be used as the specific organic dye. As commercially available products of the specific organic dye, FDB-001, FDB-002, FDB-003, FDB-004, FDB-005, FDB-006, FDB-007, and FDB-009 manufactured by Yamada Chemical Industry Co., Ltd., FSP YELLOW LY dye manufactured by Futaba Sangyo Co., Ltd., ABS407, ABS420, and ABS490 manufactured by Exciton, RDW Y03 manufactured by Fujifilm Wako Pure Chemical Corporation, and Kayalon Polyester Yellow AL manufactured by Nippon Kayaku Co., Ltd. can be cited.

[0049] In the spectacle lens of the present invention, as long as the requirements regarding the transmittance of the spectacle lens are met, the number of types of specific pigments contained in the pigment is not particularly limited, and can be one type or two or more types. Among them, from the aspect of easily meeting the requirements regarding the transmittance of the spectacle lens, the pigment preferably contains two or more specific pigments. The upper limit of the number of types of specific pigments is not particularly limited, and can be, for example, five or less.

[0050] <Properties of spectacle lens>

[0051] The spectacle lens of the present invention meets the following requirements in terms of transmittance.

[0052] That is, when the average transmittance within the wavelength range of 430 to 480 nm is Ta (unit: %), within the wavelength range of 430 to 480 nm, the transmittance of the spectacle lens every 5 nm is within the range of Ta ± y. Here, y (unit: %) is a value represented by the following formula (1).

[0053] Formula (1) y = (100% - Ta) × 0.1

[0054] It should be noted that, for example, when the average transmittance within the wavelength range of 430 to 480 nm is 80%, Ta is 80% and y is 2%. Therefore, in the spectacle lenses of the present invention, when Ta is 80%, within the wavelength range of 430 to 480 nm, the transmittance of the spectacle lenses every 5 nm is within the range of 78 to 82%.

[0055] In addition, when the average transmittance within the wavelength range of 550 to 780 nm is set as Tb (unit: %), Tb is greater than the above Ta.

[0056] The above Ta (average transmittance within the wavelength range of 430 to 480 nm) and Tb (average transmittance within the wavelength range of 550 to 780 nm) are obtained as follows.

[0057] First, in the direction same as the optical axis of the spectacle lens, the transmittance spectrum of the spectacle lens is obtained. The transmittance spectrum is obtained using a spectrophotometer.

[0058] From the obtained transmittance spectrum, the average transmittance (Ta) within the wavelength range of 430 to 480 nm and the average transmittance (Tb) within the wavelength range of 550 to 780 nm are obtained. When obtaining the above Ta and Tb, within each of the above wavelength ranges of the obtained transmittance spectrum, the transmittance every 5 nm is arithmetically averaged. For example, when calculating Ta, in the obtained transmittance spectrum, the transmittances of the spectacle lenses at each wavelength (430 nm, 435 nm, 440 nm,..., 480 nm) every 5 nm within the wavelength range of 430 to 480 nm are arithmetically averaged.

[0059] In addition, according to the above formula (1), the value of y is obtained.

[0060] It should be noted that "within the range of Ta±y of the transmittance of the spectacle lens every 5 nm within the wavelength range of 430 to 480 nm" specifically means that in the obtained transmittance spectrum, the transmittances at each wavelength (430 nm, 435 nm, 440 nm,..., 480 nm) are within the range of Ta±y.

[0061] Regarding the above Ta and Tb, considering from the aspect of more effectively blocking blue light, it is preferably to also satisfy the relationship of the following formula (2).

[0062] Formula (2) 0.1≤(100%-Tb) / (100%-Ta)≤0.9

[0063] In addition, from the perspective of improving the effect of suppressing visual allergy, the value of (100% - Tb) / (100% - Ta) is preferably 0.5 to 0.9, more preferably 0.7 to 0.8. Conversely, from the perspective of maintaining a high visual transmittance of the spectacle lens, the value of (100% - Tb) / (100% - Ta) is preferably 0.1 to 0.5, more preferably 0.1 to 0.3.

[0064] The value of Ta is not particularly limited as long as it satisfies the above formula (1), but it is preferably 2 to 90%, more preferably 10 to 80%, and further preferably 15 to 75%.

[0065] In addition, the value of Tb is not particularly limited as long as it is greater than Ta, but it is preferably 50 to 95%, more preferably 60 to 95%, and further preferably 70 to 95%.

[0066] The average transmittance Tc (unit: %) of the spectacle lens substrate within the wavelength range of 380 to 430 nm is not particularly limited, but it is preferably below Ta. Specifically, Tc is preferably 0 to 70%, more preferably 0 to 50%.

[0067] It should be noted that Tc is obtained from the transmittance spectrum obtained by the above method. And Tc is obtained by arithmetically averaging the transmittance at every 5 nm within the above wavelength range of the obtained transmittance spectrum.

[0068] The average transmittance Td (unit: %) of the spectacle lens substrate within the wavelength range of 480 to 550 nm is not particularly limited, but it is preferably above Ta and below Tb. Specifically, Td is preferably 10 to 95%, more preferably 15 to 95%.

[0069] In addition, the ratio of Td to Tb (Td / Tb) is preferably 0.4 to 0.95, more preferably 0.6 to 0.9.

[0070] It should be noted that Td is obtained from the transmittance spectrum obtained by the above method. And Td is obtained by arithmetically averaging the transmittance at every 5 nm within the above wavelength range of the obtained transmittance spectrum.

[0071] In the spectacle lens of the present invention, the transmittance spectrum is adjusted to meet the above requirements regarding the transmittance. For example, the transmittance spectrum can be adjusted by the type and content of specific pigments.

[0072] Hereinafter, the components that may be included in the spectacle lens will be described.

[0073] <Spectacle lens substrate>

[0074] The spectacle lens substrate is a member that supports the layers included in the spectacle lens.

[0075] There are no particular restrictions on the type of spectacle lens substrate, and common spectacle lens substrates made of plastics, inorganic glass, etc. can be listed. Considering excellent operability, a plastic spectacle lens substrate is preferred.

[0076] There are no particular restrictions on the type of plastic spectacle lens substrate. For example, finished lenses with both convex and concave surfaces optically finished and formed into the desired diopter, semi-finished lenses with only the convex surface optically finished (spherical surface, rotationally symmetric aspherical surface, progressive surface, etc.), and lenses in which the concave surface of the semi-finished lens is processed and ground according to the prescription of the wearer can be listed.

[0077] There are no particular restrictions on the type of plastic (so-called resin) contained in the plastic spectacle lens substrate. For example, (meth)acrylate resin, thiocarbamate resin, allyl resin, episulfide resin, polycarbonate, urethane resin, polyester, polystyrene, polyethersulfone, poly-4-methyl-1-pentene, and diethylene glycol bisallyl carbonate resin (CR-39) can be listed. Among them, thiocarbamate resin, episulfide resin, and diethylene glycol bisallyl carbonate resin can be preferably used.

[0078] It should be noted that the thiocarbamate resin can be obtained from a polyisocyanate compound and a polythiol compound.

[0079] As the polyisocyanate compound, at least one selected from isophthalic acid diisocyanate, a mixture of 2,5-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane and 2,6-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, isophorone diisocyanate, hexamethylene diisocyanate, and toluene diisocyanate is preferably used.

[0080] As the polythiol compound, at least one selected from pentaerythritol tetra(3-mercaptopropionate), 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, and a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane is preferably used.

[0081] The episulfide resin can be obtained by ring-opening polymerization of a monomer having an episulfide group (also called an episulfide group) or a mixed monomer containing the monomer. As the monomer having an episulfide group, at least one selected from bis(2,3-epithiopropyl) sulfide and bis(2,3-epithiopropyl) disulfide is preferably used.

[0082] There are no particular restrictions on the thickness of the plastic spectacle lens substrate, but from the aspect of operability, it is mostly about 1 mm to about 30 mm.

[0083] The refractive index of the plastic spectacle lens substrate is not particularly limited, but is mostly 1.50 or more, preferably 1.60 to 1.80, and more preferably 1.60 to 1.74.

[0084] In the spectacle lens of the present invention, the spectacle lens substrate preferably contains the above-mentioned specific pigment. However, when the spectacle lens substrate contains a specific pigment, the type and content of the specific pigment are adjusted to satisfy the characteristics of the above-mentioned spectacle lens.

[0085] In addition, the spectacle lens of the present invention may contain a pigment other than the above-mentioned specific pigment (hereinafter also referred to as "other pigment").

[0086] As the other pigment, a known pigment can be used. The other pigment may be an inorganic pigment or an organic pigment. In addition, the other pigment may be a dye (other dye) dissolved in water or an organic solvent, or a pigment insoluble in water or an organic solvent. Among them, from the viewpoint of easily manufacturing a spectacle lens containing the other pigment, the other pigment is preferably an inorganic dye or an organic dye, and more preferably an organic dye.

[0087] The other dye may be any dye classified as a disperse dye, a reactive dye, a direct dye, a composite dye, an acid dye, a metal complex salt dye, a vat dye, a sulfur dye, a fluorescent dye, a phosphorescent dye, a dye for resin coloring, and other functional dyes.

[0088] In addition, as the other dye, for example, a red (R) dye, a blue (B) dye, a brown dye, a purple dye, an orange dye, and a black dye can be mentioned.

[0089] As the red dye, for example, Kayalon Polyester Red (Kayalon MicroesterRed) AUL-S, Kayalon Microester Red 5L-E, Kayalon Microester Red C-LS conc, Kayalon Microester Red DX-LS, Kayalon polyester Red AN-SE, Kayalon PolyesterRed B-LE, Kayaron Polyester Rubine GL-SE 200 (manufactured by Nippon Kayaku Co., Ltd.), Kiwalonpolyester Red ESP, Kiwalon polyester Red KN-SE (manufactured by Kowa Chemical Industry Co., Ltd.), FSP-RedBL (manufactured by Futaba Sangyo Co., Ltd.), and Dianix Red (manufactured by Dystar Japan Co., Ltd.) can be mentioned.

[0090] As blue dyes, for example, Kayalon Polyester Blue AUL-S dye (manufactured by Nippon Kayaku Co., Ltd.), Dianix Blue AC-E (manufactured by Dystar Japan Co., Ltd.), Kiwalon Polyester Blue ESP, Kiwalon Polyester Blue KN-SE (manufactured by Kowa Chemical Co., Ltd.), Kayalon Microester Blue AQ-LE, Kayaron Microester Blue 5L-E, Kayalon Microester Blue C-LS conc, Kayalon Microester Blue DX-LS conc, Kayalon Polyester Blue AN-SE, Kayaron Polyester Blue AUL-S(N) (manufactured by Nippon Kayaku Co., Ltd.), and FSP-Blue AUL-S (manufactured by Futaba Sangyo Co., Ltd.) can be cited.

[0091] As for other pigments, one kind can be used alone, or two or more kinds can be used in combination. From the aspect of easily adjusting the transmission spectrum of the spectacle lens, two or more kinds of other pigments can be used in combination.

[0092] In addition, the spectacle lens substrate can contain additives such as blueing agents, light stabilizers, ultraviolet absorbers, and antioxidants.

[0093] As a method for making the spectacle lens substrate contain pigments (any one or more of specific pigments and other pigments), methods such as using a raw material obtained by mixing the material constituting the spectacle lens substrate with the pigment during the formation of the spectacle lens substrate, and a method of allowing the pigment to penetrate into the spectacle lens substrate can be cited. Among them, the method of allowing the pigment to penetrate into the spectacle lens substrate is preferred.

[0094] When allowing the pigment to penetrate into the spectacle lens substrate, it is preferable to use a pigment solution (preferably a dye solution) containing the pigment (preferably a dye). The pigment solution preferably contains a pigment (preferably a dye), a surfactant, and a solvent (such as water). The pigment solution can contain two or more pigments. Regarding the pigment (preferably a dye), the above-mentioned pigments can be used. In addition, the pigment solution can contain the above-mentioned specific pigments and other pigments.

[0095] As the surfactant, there is no particular limitation as long as it can uniformly disperse the above-mentioned pigment in a solvent such as water.

[0096] As the surfactant, for example, ionic surfactants (such as anionic surfactants, cationic surfactants, etc.) and nonionic surfactants can be cited.

[0097] As the solvent, water and organic solvents can be cited as examples.

[0098] As the organic solvent, alcohol solvents, ketone solvents, ether solvents, ester solvents, hydrocarbon solvents, halogenated hydrocarbon solvents, amide solvents, sulfone solvents and sulfoxide solvents can be cited as examples.

[0099] As needed, the coloring liquid may contain various additives such as pH regulators, viscosity regulators, leveling agents, matting agents, stabilizers, ultraviolet absorbers and antioxidants.

[0100] Regarding the content of the pigment contained in the coloring liquid, it is preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass, based on the total mass of the coloring liquid.

[0101] In addition, regarding the content of the surfactant contained in the coloring liquid, it is preferably 0.001 to 10% by mass, more preferably 0.005 to 5% by mass, based on the total mass of the coloring liquid.

[0102] More specifically, as a method for dyeing at least one surface of a plastic spectacle lens substrate, for example, the following three methods can be cited.

[0103] (1) A method of dyeing the surface of a plastic spectacle lens substrate by applying a coloring liquid to the surface of the plastic spectacle lens substrate and heating it (coating method)

[0104] (2) A method of dyeing the surface of a plastic spectacle lens substrate by immersing the plastic spectacle lens substrate in a heated coloring liquid (immersion method)

[0105] (3) A method of dyeing the surface of a plastic spectacle lens substrate by applying a sublimable pigment to a transfer medium, arranging the plastic spectacle lens substrate near the transfer medium and heating it (sublimation dyeing method)

[0106] Among these three methods, from the viewpoint of less use amount of the coloring liquid and cost reduction, the above-mentioned (1) coating method is preferred. On the other hand, from the viewpoint of easy uniform coating, the above-mentioned (2) immersion method is preferred, and from the viewpoint of easy patterning, the above-mentioned (3) sublimation dyeing method is preferred. Therefore, it can be selected according to the use. These methods can be used alone or in combination.

[0107] As a method for applying the coloring liquid to the plastic spectacle lens substrate in the above-mentioned coating method, ordinary coating methods such as brushing, dipping, spin coating, roll coating, spraying, flow coating and inkjet-type coating can be cited.

[0108] Regarding the coating, it can be coated on one side of the plastic spectacle lens substrate, or it can be coated on both sides in order to further increase the dyeing concentration.

[0109] The coating thickness of the coloring solution on the plastic spectacle lens substrate can be adjusted appropriately. For example, it can be set in the range of 0.01 to 10 μm.

[0110] In the coloring by the coating method, when coloring (coloring process) the plastic spectacle lens substrate, it is preferable to heat-treat after coating the coloring solution on the surface of the plastic spectacle lens substrate so that the dye in the coloring solution penetrates and diffuses into the surface of the plastic spectacle lens substrate.

[0111] As the heating conditions of the plastic spectacle lens substrate coated with the coloring solution, the heating temperature is preferably 70 to 180 °C, and the heating time is preferably 10 to 180 minutes. As the heating method, air oven heating, far-infrared irradiation heating, and UV irradiation heating can be cited.

[0112] In the coloring by the coating method, when coloring (coloring process) the plastic spectacle lens substrate with a gentle concentration gradient, an amount of dye corresponding to the concentration gradient can penetrate into the interior of the plastic spectacle lens substrate by heating while gradually changing the heating region of the coating liquid surface (coloring liquid surface) after coating the coloring solution on the lens.

[0113] The plastic spectacle lens substrate can be cleaned after coating the coloring solution on the plastic spectacle lens substrate and heat-treating the plastic spectacle lens substrate coated with the coloring solution.

[0114] As the cleaning method of the plastic spectacle lens substrate, there is no particular limitation as long as the coating layer (the coated coloring solution) on the surface of the plastic spectacle lens substrate can be removed, but it is preferably wiped with an organic solvent or cleaned with an alkaline cleaning agent.

[0115] When coloring the plastic spectacle lens substrate by the above dipping method, the plastic spectacle lens substrate can be dipped in the coloring solution so that the dye in the coloring solution penetrates and diffuses from the surface of the plastic spectacle lens substrate.

[0116] In the coloring by the dipping method, it is preferable to dip the plastic spectacle lens substrate in the coloring solution heated to 80 to 95 °C.

[0117] After the dipping is completed, the plastic spectacle lens substrate can be cleaned. As the cleaning method of the plastic spectacle lens substrate, wiping with a solvent can be cited.

[0118] <Base coat>

[0119] The spectacle lens of the present invention can have a base coat between the spectacle lens substrate and the hard coat. The base coat can improve the adhesion of the hard coat to the spectacle lens substrate and can impart impact resistance to the spectacle lens.

[0120] The material constituting the undercoat is not particularly limited, and known materials can be used, such as mainly resins. The type of resin used is not particularly limited, and examples include urethane resin, epoxy resin, phenolic resin, polyimide, polyester, bismaleimide resin, and polyolefin, with urethane resin being preferred.

[0121] The undercoat may contain other components in addition to the above resins.

[0122] As other components, for example, fine particles of oxides of at least one metal selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti or their composite oxide fine particles, hydrolyzable silicon compounds and / or their hydrolysis condensates, and surfactants can be cited.

[0123] In addition, as other components, at least one of the above-mentioned specific pigments and other pigments may also be included.

[0124] The method for forming the undercoat is not particularly limited, and known methods can be employed. For example, a method of forming the undercoat by applying an undercoat-forming composition containing a predetermined resin onto the spectacle lens substrate and, if necessary, performing a curing treatment can be cited.

[0125] The method for applying the undercoat-forming composition is not particularly limited, and examples include the methods exemplified in the method for applying the hard coat-forming composition onto the spectacle lens substrate described below.

[0126] The thickness of the undercoat is not particularly limited, but is preferably 0.3 to 2 μm.

[0127] <Hard coat>

[0128] The spectacle lens of the present invention may have a hard coat. When the spectacle lens has a hard coat, scratch resistance can be imparted to the spectacle lens.

[0129] As the hard coat, a hard coat having a hardness of "H" or higher as shown by a pencil hardness tester using the test method specified in JIS K5600 is preferred.

[0130] As the hard coat, known hard coats can be used, such as organic hard coats, inorganic hard coats, and organic-inorganic hybrid hard coats. In the field of spectacle lenses, organic-inorganic hybrid hard coats are usually used.

[0131] The hard coat preferably contains a polymer of a polymerizable monomer (a polymer obtained by polymerizing a polymerizable monomer).

[0132] The polymerizable monomer is not particularly limited, and examples thereof include the specific (meth)acrylate described below, silsesquioxane having a radically polymerizable group, polyfunctional acrylate, a compound having two or more epoxy groups, and a silsesquioxane compound having an oxetanyl group.

[0133] In addition, the hard coat may also contain inorganic components such as metal oxide particles described below.

[0134] In addition, the hard coat may also contain at least one of the above-mentioned specific pigment and other pigments.

[0135] The hard coat is preferably a layer formed using a hard coat-forming composition containing a polymerizable monomer.

[0136] ((Meth)acrylate having at least one group selected from the group consisting of a phosphate group and a sulfonic acid group)

[0137] As the polymerizable monomer that can be contained in the hard coat-forming composition, a (meth)acrylate having at least one group selected from the group consisting of a phosphate group and a sulfonic acid group (hereinafter also simply referred to as "specific group") (hereinafter also simply referred to as "specific (meth)acrylate") can be cited.

[0138] It should be noted that (meth)acrylate means acrylate or methacrylate.

[0139] As the specific group, a phosphate group is preferred.

[0140] The number of specific groups in the specific (meth)acrylate may be one or more, and may also be two or more. As an upper limit, for example, it can be set to five or less.

[0141] The specific (meth)acrylate may be monofunctional or polyfunctional. It should be noted that polyfunctional means that the specific (meth)acrylate has two or more specific groups.

[0142] The phosphate group is a group represented by the following formula. Represents the bonding position.

[0143]

[0144] The sulfonic acid group is a group represented by the following formula.

[0145]

[0146] As the specific (meth)acrylate, a compound represented by formula (C) is preferred.

[0147] Formula (C) CH2=CR c1 -COO-L c -Rc2

[0148] R c1 represents a hydrogen atom or a methyl group.

[0149] L c represents a divalent hydrocarbon group which may contain heteroatoms (e.g., an oxygen atom, a nitrogen atom, and a sulfur atom). The number of carbon atoms of the divalent hydrocarbon group is not particularly limited, and is preferably 1 to 10. Examples of the divalent hydrocarbon group include an alkylene group, an alkenylene group, an alkynylene group, an arylene group, and combinations of these groups. Preferably, an alkylene group which may contain heteroatoms (e.g., -O-alkylene-) is used.

[0150] R c2 represents a group selected from the group consisting of a phosphate group and a sulfonic acid group.

[0151] (Silsesquioxane having a radically polymerizable group)

[0152] As the polymerizable monomer which may be contained in the hard coat-forming composition, silsesquioxane having a radically polymerizable group can be cited.

[0153] As the radically polymerizable group, a group having an ethylenically unsaturated bond is preferred. Examples of the group having an ethylenically unsaturated bond include a (meth)acryloyl group, a styryl group, and a vinyl group.

[0154] It should be noted that, generally, a silsesquioxane compound refers to a silane compound having a basic skeleton represented by the formula (D) obtained by hydrolyzing trifunctional silane compounds such as alkoxysilane, chlorosilane, and silanol. As the structure of the silsesquioxane compound, in addition to the irregular form called the random structure, a ladder structure, a cage type (fully condensed cage type) structure, and an incomplete cage type structure (a partial cracking structure of the cage type structure, that is, a structure in which a part of the silicon atoms is missing from the cage type structure or a structure in which a part of the silicon-oxygen bonds of the cage type structure are broken) are known.

[0155] In the following formula (D), R d represents an organic group.

[0156] Formula (D) R d -SiO 3 / 2

[0157] The structure of the silsesquioxane compound having a radically polymerizable group is not particularly limited, and may be any one of the above-mentioned random structure, ladder structure, cage type structure, and incomplete cage type structure, or a mixture of a plurality of structures.

[0158] The equivalent weight of the radically polymerizable group contained in the silsesquioxane compound is not particularly limited, but from the viewpoint of better hardness of the hard coat, it is preferably 30 to 500 g / eq., more preferably 30 to 150 g / eq.

[0159] The silsesquioxane compound having a radically polymerizable group can be synthesized by a known method or a commercially available product can be used.

[0160] (Polyfunctional acrylate)

[0161] As the polymerizable monomer that can be contained in the hard coat-forming composition, a polyfunctional (meth)acrylate different from the specific (meth)acrylate and the silsesquioxane having a radically polymerizable group can be cited.

[0162] The polyfunctional (meth)acrylate means a compound having two or more (meth)acryloyl groups. The number of (meth)acryloyl groups is not particularly limited, but is preferably 2 to 6, more preferably 2 to 3.

[0163] As the polyfunctional (meth)acrylate, a compound represented by the formula (E) is preferred.

[0164] Formula (E) CH2=CR e1 -CO-L e1 -CO-CR e2 =CH2

[0165] R e1 and R e2 each independently represents a hydrogen atom or a methyl group.

[0166] L e1 represents a divalent hydrocarbon group that may contain a heteroatom (for example, an oxygen atom, a nitrogen atom, a sulfur atom). The number of carbon atoms of the divalent hydrocarbon group is not particularly limited, and is preferably 1 to 10. As the divalent hydrocarbon group, for example, an alkylene group, an alkenylene group, an alkynylene group, an arylene group, and a combination of these groups that may contain a heteroatom can be cited, and an alkylene group that may contain a heteroatom is preferred.

[0167] Among them, an alkylene group containing an oxygen atom is preferred, and a group represented by -O-(L e2 -O) r - is more preferred. It should be noted that L e2 represents an alkylene group (preferably having 1 to 3 carbon atoms). r represents an integer of 1 or more, preferably an integer of 1 to 10, more preferably an integer of 2 to 5.

[0168] (Compound having two or more epoxy groups)

[0169] As the polymerizable monomer that can be contained in the composition for forming a hard coat, compounds having two or more epoxy groups (hereinafter also simply referred to as "polyfunctional epoxy compounds") can be cited.

[0170] The epoxy group refers to the group represented by the following formula (F). R f represents a hydrogen atom or an alkyl group (for example, methyl, ethyl, and propyl). represents the bonding position.

[0171]

[0172] The polyfunctional epoxy compound contains a plurality (two or more) of epoxy groups. The number of epoxy groups is not particularly limited, but it can usually be set to 2 to 6, or can also be set to 2 to 3.

[0173] The type of the polyfunctional epoxy compound is not particularly limited, and known polyfunctional epoxy compounds can be cited. As the polyfunctional epoxy compound, for example, bisphenol A type epoxy compound, bisphenol F type epoxy compound, phenol novolac type epoxy compound, cresol novolac type epoxy compound, and aliphatic glycidyl ether type epoxy compound can be cited.

[0174] (Silsesquioxane compound having an oxetanyl group)

[0175] As the polymerizable monomer that can be contained in the composition for forming a hard coat, silsesquioxane compounds having an oxetanyl group can be cited.

[0176] The oxetanyl group refers to the group represented by the following formula (G). R g represents a hydrogen atom or an alkyl group (for example, methyl, ethyl, propyl). represents the bonding position.

[0177]

[0178] The structure of the silsesquioxane compound having an oxetanyl group is not particularly limited, and it can be any one of the above-mentioned random structure, ladder structure, cage structure, and incomplete cage structure, or can also be a mixture of multiple structures.

[0179] The equivalent amount of the oxetanyl group contained in the silsesquioxane compound is not particularly limited, but from the aspect of more excellent hardness of the hard coat, it is preferably 50 to 500 g / eq., more preferably 150 to 300 g / eq.

[0180] The silsesquioxane compound having an oxetanyl group can be synthesized according to a known method, or a commercially available product can be used. As the commercially available product, for example, those manufactured by Toagosei Co., Ltd.: OX-SQ TX-100, OX-SQ SI-20, OX-SQ HDX can be cited.

[0181] (Metal oxide particles)

[0182] The composition for forming a hard coat may contain metal oxide particles.

[0183] There is no particular limitation on the type of the metal oxide particles, and known metal oxide particles can be cited. As the metal oxide particles, for example, particles of oxides of at least one metal selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti can be cited. Among them, from the viewpoint of workability, it is preferable that the metal oxide particles are particles of a Si-containing oxide (silicon oxide particles), a Sn-containing oxide (tin oxide particles), a Zr-containing oxide (zirconium oxide particles), or a Ti-containing oxide (titanium oxide particles).

[0184] It should be noted that the metal oxide particles may contain only one kind of metal (metal atom) exemplified above, or may contain two or more kinds of metals (metal atoms).

[0185] In addition, Si (silicon) is sometimes classified as a metalloid, but in this specification, Si is included in metals.

[0186] There is no particular limitation on the average particle diameter of the metal oxide particles, but for example, it is preferably 1 to 200 nm, more preferably 5 to 30 nm. When within the above range, the dispersion stability of the metal oxide particles in the composition for forming a hard coat is more excellent.

[0187] It should be noted that the above average particle diameter is obtained by measuring the diameters of 20 or more metal oxide particles using a transmission electron microscope and calculating their arithmetic average. When the metal oxide particles are not circular, the major axis is used as the diameter.

[0188] Various functional groups can be introduced onto the surface of the metal oxide particles as needed.

[0189] (At least one selected from the group consisting of a hydrolyzable silicon compound represented by formula (H), a hydrolyzate thereof, and a hydrolytic condensate thereof)

[0190] From the viewpoint of more excellent predetermined effects, the composition for forming a hard coat may contain at least one selected from the group consisting of a hydrolyzable silicon compound represented by formula (H), a hydrolyzate thereof, and a hydrolytic condensate thereof (hereinafter also simply referred to as "hydrolyzable silicon compounds"). It should be noted that the hydrolyzable silicon compound refers to a compound in which a hydrolyzable group is bonded to a silicon atom.

[0191] Formula (H) R h1 -L h -Si(Rh2 ) s (R h3 ) 3-s

[0192] R h1 represents an epoxy group.

[0193] The definition of the epoxy group is as described above.

[0194] L h represents a divalent hydrocarbon group which may contain a heteroatom. The number of carbon atoms of the hydrocarbon group is not particularly limited, and is preferably 1 to 10. Examples of the divalent hydrocarbon group include an alkylene group, an alkenylene group, an alkynylene group, an arylene group, and combinations of these groups, and an alkylene group which may contain a heteroatom is preferred.

[0195] R h2 represents a hydrolyzable group. The hydrolyzable group is a group directly bonded to Si (silicon atom) and capable of undergoing a hydrolysis reaction and / or a condensation reaction. Examples of the hydrolyzable group include an alkoxy group, a hydroxyl group, a halogen atom, an acyloxy group, an alkenoxy group, and an isocyanate group.

[0196] R h3 represents an alkyl group. The number of carbon atoms of the alkyl group represented by R h3 is preferably 1 to 10.

[0197] s represents an integer of 1 to 3. s is preferably 3.

[0198] The hydrolyzate of the hydrolyzable silicon compound refers to a compound obtained by hydrolyzing the hydrolyzable group in the hydrolyzable silicon compound. It should be noted that the above hydrolyzate may be a compound in which all the hydrolyzable groups have undergone hydrolysis (complete hydrolyzate), or a compound in which a part of the hydrolyzable groups have undergone hydrolysis (partial hydrolyzate). That is, the above hydrolyzate may be a complete hydrolyzate, a partial hydrolyzate, or a mixture thereof.

[0199] In addition, the hydrolysis condensate of the hydrolyzable silicon compound refers to a compound obtained by condensing the hydrolyzate obtained after hydrolyzing the hydrolyzable group in the hydrolyzable silicon compound. It should be noted that as the above hydrolysis condensate, it may be a compound in which all the hydrolyzable groups have undergone hydrolysis and all the hydrolyzates have undergone condensation (complete hydrolysis condensate), or a compound in which a part of the hydrolyzable groups have undergone hydrolysis and a part of the hydrolyzates have undergone condensation (partial hydrolysis condensate). That is, the above hydrolysis condensate may be a complete hydrolysis condensate, a partial hydrolysis condensate, or a mixture thereof.

[0200] (Other components)

[0201] The composition for forming a hard coat may contain components other than the above components.

[0202] The composition for forming a hard coat may contain a radical polymerization initiator. Examples of the radical polymerization initiator include a photo radical polymerization initiator and a thermal radical polymerization initiator.

[0203] The composition for forming a hard coat may contain a cationic polymerization initiator. Examples of the cationic polymerization initiator include a photo cationic polymerization initiator and a thermal cationic polymerization initiator.

[0204] The composition for forming a hard coat may contain a solvent.

[0205] The solvent may be water or an organic solvent.

[0206] There is no particular limitation on the type of the organic solvent, and examples thereof include an alcohol-based solvent, a ketone-based solvent, an ether-based solvent, an ester-based solvent, a hydrocarbon-based solvent, a halogenated hydrocarbon-based solvent, an amide-based solvent, a sulfone-based solvent, and a sulfoxide-based solvent.

[0207] The composition for forming a hard coat may contain at least one of the above-mentioned specific pigment and other pigments.

[0208] The specific pigment and other pigments are as described above.

[0209] The composition for forming a hard coat may contain various additives such as an ultraviolet absorber, an anti-aging agent, a coating film conditioner, a light stabilizer, an antioxidant, an anti-coloring agent, a dye, a filler, and an internal mold release agent as needed.

[0210] The composition for forming a hard coat contains the above-mentioned various components.

[0211] There is no particular limitation on the method for manufacturing the composition for forming a hard coat. For example, the above-mentioned components may be mixed at once, or the components may be mixed step by step.

[0212] Regarding the content of the polymerizable monomer in the composition for forming a hard coat, there is no particular limitation, but from the viewpoint of more excellent predetermined effects, it is preferably 1 to 100% by mass, more preferably 5 to 60% by mass, based on the total solid components (hard coat constituent components) in the composition for forming a hard coat.

[0213] It should be noted that the total solid components (hard coat constituent components) refer to the components that constitute the hard coat through a curing process, and the solvent is not included in the solid components. In addition, even if the component is in a liquid state, as long as it is a component that constitutes the hard coat, it is calculated as a solid component.

[0214] Regarding the content of the metal oxide particles in the composition for forming a hard coat, there is no particular limitation, but from the viewpoint of more excellent predetermined effects, it is preferably 10 to 90% by mass, more preferably 25 to 75% by mass, based on the total solid components in the composition for forming a hard coat.

[0215] When a hydrolyzable silicon compound is included in the composition for forming a hard coat, the content of the hydrolyzable silicon compound is not particularly limited. However, from the viewpoint of more excellent predetermined effects, it is preferably 0.5 to 30% by mass, more preferably 1 to 10% by mass, based on the total solid content in the composition for forming a hard coat.

[0216] As a preferred embodiment of the composition for forming a hard coat, a composition for forming a hard coat (hereinafter also simply referred to as "specific composition") containing a compound having two or more epoxy groups, an oxetanyl silsesquioxane compound, and a polymerization initiator can be exemplified.

[0217] As the polymerization initiator, a cationic polymerization initiator is preferably used, and a photo cationic polymerization initiator and a thermal cationic polymerization initiator can be used in combination.

[0218] Regarding the content of the polyfunctional epoxy compound in the specific composition, there is no particular limitation. However, from the viewpoints of more excellent scratch resistance and appearance characteristics of the hard coat and a fast curing reaction rate, it is preferably 1 to 15% by mass, more preferably 1 to 10% by mass, based on the total solid content (hard coat constituent components) in the specific composition.

[0219] Regarding the content of the oxetanyl silsesquioxane compound in the specific composition, there is no particular limitation. However, from the viewpoints of more excellent scratch resistance of the hard coat and small stress of the hard coat, it is preferably 35 to 70% by mass, more preferably 35 to 60% by mass, based on the total solid content in the specific composition.

[0220] Regarding the content of the polymerization initiator in the specific composition, there is no particular limitation. However, from the viewpoint of more excellent scratch resistance of the hard coat, it is preferably 0.1 to 3.0% by mass, more preferably 0.2 to 1.5% by mass, based on the total solid content in the specific composition.

[0221] When metal oxide particles are included in the specific composition, the content of the metal oxide particles is not particularly limited. However, from the viewpoint of more excellent scratch resistance of the hard coat, it is preferably 25 to 60% by mass, more preferably 30 to 50% by mass, based on the total solid content in the specific composition.

[0222] When a hydrolyzable silicon compound is included in the composition for forming a hard coat, the content of the hydrolyzable silicon compound is not particularly limited. However, from the viewpoint of more excellent adhesion between the hard coat and the substrate, it is preferably less than 10% by mass, more preferably less than 9% by mass, based on the total solid content in the specific composition. The lower limit is not particularly limited, but 1% by mass or more can be exemplified.

[0223] Regarding the content of the polyhedral oligomeric silsesquioxane compound having an oxetanyl group relative to the total mass of the polyfunctional epoxy compound and the polyhedral oligomeric silsesquioxane compound having an oxetanyl group, from the viewpoint of more excellent abrasion resistance and appearance characteristics of the hard coat, it is preferably more than 70% by mass, more preferably 80% by mass or more, and still more preferably 85% by mass or more. The upper limit is not particularly limited, but can be set to 98% by mass or less.

[0224] Regarding the total mass of the polyfunctional epoxy compound and the polyhedral oligomeric silsesquioxane compound having an oxetanyl group relative to the total solid content in a specific composition, there is no particular limitation, but from the viewpoint of excellent abrasion resistance of the hard coat, it is preferably 35 to 70% by mass.

[0225] As a method for forming a hard coat using a hard coat-forming composition, a method can be exemplified in which the hard coat-forming composition is applied to a spectacle lens substrate to form a coating film, and a curing treatment such as light irradiation treatment and heat treatment is performed on the coating film.

[0226] As the curing treatment, either only the light irradiation treatment or the heat treatment can be performed, or both can be performed. In the case of performing both, the light irradiation treatment and the heat treatment can be performed simultaneously, or one can be performed first and then the other.

[0227] It should be noted that after the coating film is formed, a drying treatment such as heat treatment can be performed as needed to remove the solvent in the coating film.

[0228] The method for applying the hard coat-forming composition is not particularly limited, and known methods (for example, dip coating method, spin coating method, spraying method, inkjet coating method, and flow coating method) can be exemplified.

[0229] The film thickness of the coating film formed on the spectacle lens substrate is not particularly limited, and a film thickness that can achieve a predetermined film thickness of the hard coat can be appropriately selected.

[0230] The conditions for the light irradiation treatment are not particularly limited, and appropriate conditions can be selected according to the type of polymerization initiator used.

[0231] The type of light during light irradiation is not particularly limited, and for example, ultraviolet rays and visible light can be exemplified. As the light source, for example, a high-pressure mercury lamp can be exemplified.

[0232] The cumulative light amount during light irradiation is not particularly limited, but from the viewpoints of productivity and curability of the coating film, it is preferably 100 to 3000 mJ / cm 2 and more preferably 100 to 2000 mJ / cm 2 .

[0233] The conditions for the heat treatment are not particularly limited, and the optimal conditions can be selected according to the type of polymerization initiator used.

[0234] The heating temperature is preferably 30 to 100 °C, and the heating time is preferably 5 to 360 minutes.

[0235] The film thickness of the hard coat is not particularly limited, but it is preferably 1 μm or more, more preferably 5 μm or more, and further preferably 10 μm or more. It should be noted that the upper limit of the film thickness can be set, for example, to 30 μm or less.

[0236] The above film thickness is the average film thickness. As a method for measuring it, the film thicknesses at any 5 points of the hard coat are measured and arithmetically averaged to obtain it.

[0237] It should be noted that the hard coat can contain additives such as blueing agents, light stabilizers, and antioxidants.

[0238] <Anti-reflection film>

[0239] The spectacle lens of the present invention can have an anti-reflection film. The anti-reflection film is preferably disposed on the side of the hard coat opposite to the spectacle lens substrate.

[0240] The anti-reflection film is a layer having a function of preventing reflection of incident light. Specifically, it can have low reflection characteristics (broadband low reflection characteristics) throughout the visible light region of 380 to 780 nm.

[0241] The structure of the anti-reflection film is not particularly limited, and it can be a single-layer structure or a multilayer structure.

[0242] As the anti-reflection film, an inorganic anti-reflection film is preferred. The inorganic anti-reflection film refers to an anti-reflection film composed of an inorganic compound.

[0243] In the case of a multilayer structure, a structure in which a low refractive index layer and a high refractive index layer are alternately laminated is preferred. It should be noted that, as the material constituting the high refractive index layer, for example, oxides of titanium, zirconium, aluminum, niobium, tantalum, or lanthanum can be cited. As the material constituting the low refractive index layer, for example, silicon dioxide can be cited.

[0244] The manufacturing method of the anti-reflection film is not particularly limited, and for example, dry methods such as vacuum evaporation, sputtering, ion plating, ion beam assistance, and CVD can be cited.

[0245] <Water and oil repellent layer>

[0246] The spectacle lens of the present invention can contain a water and oil repellent layer. The water and oil repellent layer is preferably disposed on the outermost layer of the spectacle lens.

[0247] The water and oil repellent layer reduces the surface energy of the spectacle lens, improves the anti-fouling function of the spectacle lens, and at the same time improves the smoothness of the surface of the spectacle lens. As a result, the abrasion resistance of the spectacle lens is improved.

[0248] The material constituting the water and oil repellent layer is not particularly limited. For example, fluorine-containing compounds (compounds containing fluorine atoms) and silicon-containing compounds (compounds containing silicon atoms) can be cited. Among them, from the aspect of more excellent water and oil repellency, the water and oil repellent layer preferably contains a fluorine-containing compound, and more preferably contains at least one selected from the group consisting of organosilicon compounds containing fluorine-substituted alkyl groups, their hydrolyzates, and their hydrolytic condensates.

[0249] It should be noted that the materials constituting the water and oil repellent layer can be used alone or in combination of two or more.

[0250] The organosilicon compound containing a fluorine-substituted alkyl group refers to an organosilicon compound containing an alkyl group in which part or all of the hydrogen atoms are substituted by fluorine atoms and having a hydrolyzable group.

[0251] Here, the hydrolyzable group refers to a group directly bonded to a silicon atom and capable of undergoing hydrolysis reaction and condensation reaction. For example, alkoxy groups, halogen atoms, acyloxy groups, alkenyloxy groups, and isocyanate groups can be cited. It should be noted that when two or more hydrolyzable groups are directly bonded to one silicon atom, they can be the same or different.

[0252] The hydrolyzate of the organosilicon compound containing a fluorine-substituted alkyl group refers to a compound obtained by hydrolyzing the hydrolyzable group in the organosilicon compound containing a fluorine-substituted alkyl group. It should be noted that the above hydrolyzate can be a compound in which all the hydrolyzable groups have undergone hydrolysis (complete hydrolyzate), or a compound in which a part of the hydrolyzable groups have undergone hydrolysis (partial hydrolyzate). That is to say, the above hydrolyzate can be a complete hydrolyzate, a partial hydrolyzate, or a mixture thereof.

[0253] The hydrolytic condensate of the organosilicon compound containing a fluorine-substituted alkyl group refers to a compound obtained by hydrolyzing the hydrolyzable group in the organosilicon compound containing a fluorine-substituted alkyl group and then condensing the obtained hydrolyzate. It should be noted that as the above hydrolytic condensate, it can be a compound in which all the hydrolyzable groups have undergone hydrolysis and all the hydrolyzates have undergone condensation (complete hydrolytic condensate), or a compound in which a part of the hydrolyzable groups have undergone hydrolysis and a part of the hydrolyzates have undergone condensation (partial hydrolytic condensate). That is to say, the above hydrolytic condensate can be a complete hydrolytic condensate, a partial hydrolytic condensate, or a mixture thereof.

[0254] The thickness of the water and oil repellent layer of the spectacle lens is not particularly limited, but is preferably 5 to 35 nm.

[0255] The method for forming the water- and oil-repellent layer is not particularly limited and can be arbitrarily selected according to the materials used, desired properties, thickness, etc. For example, a method of coating a composition for forming a water- and oil-repellent layer containing a silicone compound having a fluorine-substituted alkyl group on a lens substrate and performing a curing treatment as needed, and a dry method can be cited.

[0256] As the coating method, for example, dip coating, roll coating, bar coating, spin coating, spray coating, die coating, gravure coating, etc. can be cited.

[0257] As the curing treatment, for example, light irradiation treatment, heat treatment, and water vapor contact treatment can be cited. The water vapor contact treatment can be, for example, a treatment of contacting with air having a humidity controlled to 50 to 90% RH. The above curing treatments can be carried out in combination.

[0258] As the dry method, for example, the same method as the above antireflection film can be cited.

[0259] <Use>

[0260] The spectacle lens of the present invention is suitable for use as a lens for spectacles. The spectacle lens of the present invention can reduce photophobia in more visually allergic users, and thus is particularly suitable as a spectacle lens for visually allergic users.

[0261] It should be noted that according to the left-right difference in visual allergy, spectacle lenses having different transmission spectra can be used for the left and right lenses of the spectacles.

[0262] Examples

[0263] Hereinafter, the above-described manner will be described in more detail by way of examples and comparative examples, but the present invention is not limited by any of these examples.

[0264] <Preparation of Dyeing Solution>

[0265] A dyeing solution was prepared by mixing a dye, a surfactant, and pure water.

[0266] Put pure water (1000 parts by mass) into a container, add FSP YELLOW LY dye (manufactured by Futaba Sangyo Co., Ltd.) (2.0 parts by mass) as a yellow dye and Nicca Sunsolt #7000 (trade name, manufactured by Nihon Kayaku Co., Ltd.) (1.0 part by mass), and use the resulting substance as Dyeing Solution 1. Additionally, put pure water (1000 parts by mass) into a container, add FSP BLUE AUL-S dye (manufactured by Futaba Sangyo Co., Ltd.) (2.0 parts by mass) as a blue dye and Nicca Sunsolt #7000 (1.0 part by mass), and use the resulting substance as Dyeing Solution 2. Moreover, put pure water (1000 parts by mass) into a container, add FSP RED BL dye (manufactured by Futaba Sangyo Co., Ltd.) (2.0 parts by mass) as a red dye and Nicca Sunsolt #7000 (1.0 part by mass), and use the resulting substance as Dyeing Solution 3.

[0267] In addition, mix and stir FDB-006 (manufactured by Yamada Chemical Industry Co., Ltd.) (0.05 g) as a dye, cellulose acetate butyrate as an adhesive resin (3 g), tetrahydrofuran as a solvent (96.7 g), and L70001 (manufactured by Toray Dow Corning Co., Ltd.) (0.03 g) as a surfactant, and use the resulting substance as Dyeing Solution 4.

[0268] When preparing Dyeing Solution 4, change the amount of FDB-006 from 0.05 g to 0.2 g, and use the resulting substance as Dyeing Solution 5. When preparing Dyeing Solution 4, change the amount of FDB-006 from 0.05 g to 0.3 g, and use the resulting substance as Dyeing Solution 6. When preparing Dyeing Solution 4, change the amount of FDB-006 from 0.05 g to 0.5 g, and use the resulting substance as Dyeing Solution 7.

[0269] It should be noted that the above-mentioned FSP YELLOW FL dye and the above-mentioned FDB-006 are equivalent to specific dyes. That is, the above-mentioned FSP YELLOW LY dye and the above-mentioned FDB-006 have a maximum absorption wavelength in the wavelength range of 400 - 510 nm, and the maximum absorption coefficient in the wavelength range of 550 - 780 nm is 1 / 5 or less of the absorption coefficient at the maximum absorption wavelength.

[0270] More specifically, the absorption coefficient at the maximum absorption wavelength of the FSP YELLOW LY dye is 1.3×10 5 mL / (g·cm), and the absorption coefficient at the maximum absorption wavelength of FDB-006 is 1.2×10 5 mL / (g·cm). In addition, the maximum absorption coefficient of the FSP YELLOW LY dye in the wavelength range of 550 - 780 nm is 4.8×102 mL / (g·cm), and the maximum absorption coefficient of FDB-006 within the wavelength range of 550 to 780 nm is 0 mL / (g·cm).

[0271] <Example 1>

[0272] Using a spin coater, the dye solution 4 was coated on the concave surface of a plastic spectacle lens substrate made of a thiocarbamate resin with a refractive index of 1.67 (manufactured by Nikon Essilor Co., Ltd., Nikon Lite 4AS, size 80φ, center thickness 2 mm). After coating, it was heated at 160 °C for 1 hour to allow the dye to penetrate into the plastic spectacle lens substrate. Then, the plastic spectacle lens substrate was cooled, and further the surface resin layer was removed to obtain a spectacle lens substrate penetrated with the dye (dyed lens substrate).

[0273] Next, the three prepared dye solutions 1, 2, and 3 were heated to 90 °C respectively, and the dyed lens substrates were immersed in the dye solutions 1, 2, and 3 respectively for dyeing to obtain lens substrates dyed brown (brown lens substrates).

[0274] On the surface of the obtained brown lens substrate, a urethane-based impact resistance improving coating film (primer coat) with a thickness of about 1 μm was formed. An organosilicon-based hard coat with a thickness of about 2 μm was formed on the primer coat. On the hard coat, a multilayer film antireflection film made of inorganic oxides with a thickness of about 0.3 μm was formed by vacuum evaporation to obtain the spectacle lens of Example 1 (spectacle lens 1).

[0275] <Example 2>

[0276] In Example 1, the dye solution 5 was used instead of the dye solution 4, and the same operations as in Example 1 were performed except for this to obtain the spectacle lens of Example 2 (spectacle lens 2).

[0277] <Example 3>

[0278] In Example 1, the dye solution 6 was used instead of the dye solution 4, and the same operations as in Example 1 were performed except for this to obtain the spectacle lens of Example 3 (spectacle lens 3).

[0279] <Example 4>

[0280] In Example 1, the dye solution 7 was used instead of the dye solution 4, and the same operations as in Example 1 were performed except for this to obtain the spectacle lens of Example 4 (spectacle lens 4).

[0281] <Comparative Example 1>

[0282] The three prepared staining solutions 1, 2, and 3 were each heated to 90°C, and plastic spectacle lens substrates identical to those in Example 1 were immersed in each staining solution for dyeing to obtain brown lens substrates. It should be noted that during dyeing, the hue of the dyed lens substrates was visually confirmed under daylight-colored LED illumination, and the immersion time in each staining solution was adjusted so as to achieve the same color density and hue as those of spectacle lens 1.

[0283] Next, in the same manner as in Example 1, a bottom coat, a hard coat, and an antireflection film were formed on the brown lens substrates to obtain the spectacle lenses (spectacle lens 5) of Comparative Example 1.

[0284] <Comparative Example 2>

[0285] In Comparative Example 1, the immersion time in each staining solution was adjusted so as to achieve the same color density and hue as those of spectacle lens 2, and otherwise, the same operations as in Comparative Example 1 were performed to obtain the spectacle lenses (spectacle lens 6) of Comparative Example 2.

[0286] <Comparative Example 3>

[0287] In Comparative Example 1, the immersion time in each staining solution was adjusted so as to achieve the same color density and hue as those of spectacle lens 3, and otherwise, the same operations as in Comparative Example 1 were performed to obtain the spectacle lenses (spectacle lens 6) of Comparative Example 2.

[0288] <Comparative Example 4>

[0289] In Comparative Example 1, the immersion time in each staining solution was adjusted so as to achieve the same color density and hue as those of spectacle lens 4, and otherwise, the same operations as in Comparative Example 1 were performed to obtain the spectacle lenses (spectacle lens 6) of Comparative Example 2.

[0290] The spectacle lenses of Examples 1 to 4 and Comparative Examples 1 to 4 were obtained through the above steps. The transmission spectra of the obtained spectacle lenses are shown in Figures 2 to 5 . The transmission spectra of the respective spectacle lenses were obtained by the above method.

[0291] The above Ta (average transmittance within the wavelength range of 430 - 480 nm), Tb (average transmittance within the wavelength range of 550 - 780 nm), Tc (average transmittance within the wavelength range of 380 - 430 nm), Td (average transmittance within the wavelength range of 480 - 550 nm), y, and the values obtained by subtracting the transmittance of the spectacle lens at every 5 nm within the wavelength range of 430 - 480 nm from Ta for each spectacle lens are shown in Table 1. It should be noted that in Table 1, for example, the column of "Ta - T480nm" records the value obtained by subtracting the transmittance at 480 nm from Ta.

[0292] It should be noted that the unit of the values in Table 1 is %.

[0293]

[0294] As shown in Table 1, in the transmission spectra of the spectacle lenses of Examples 1 to 4, in the wavelength range of 430 to 480 nm, the transmittance of the spectacle lenses every 5 nm is within the range of Ta ± y, and Tb is greater than the above Ta. On the other hand, in the transmission spectra of the spectacle lenses of Comparative Examples 1 to 4, in the wavelength range of 430 to 480 nm, the transmittance of the spectacle lenses every 5 nm is not within the range of Ta ± y.

[0295] <Evaluation>

[0296] For 4 subjects, they were asked to observe the scenery including buildings, parks, and roads through the spectacle lenses of Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, Example 3 and Comparative Example 3, and Example 4 and Comparative Example 4, and to subjectively evaluate which spectacle lenses had a higher effect of reducing photophobia.

[0297] More specifically, for 4 subjects, the above evaluation was carried out on them in the afternoon on a sunny day as Condition 1 and in the morning on a sunny day as Condition 2, and the spectacle lenses of the examples and the comparative examples were compared. When it was felt that one of the spectacle lenses had a higher effect of reducing photophobia, the spectacle lens that reduced photophobia more was recorded as 1 point, and the other spectacle lens was recorded as 0 point. When it was felt that the two had the same effect of reducing photophobia, both spectacle lenses were recorded as 0.5 points.

[0298] The total scores given by each subject when using the spectacle lenses of Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, Example 3 and Comparative Example 3, and Example 4 and Comparative Example 4 are shown in Table 2 below.

[0299]

[0300] It was confirmed from the results of Table 2 that compared with the spectacle lenses of each comparative example, the spectacle lenses of each example could reduce photophobia in more users.

[0301] Symbol Explanation

[0302] 10 Spectacle lens

[0303] 12 Spectacle lens substrate

[0304] 14 Hard coating

[0305] 16 Anti-reflection film

Claims

1. A spectacle lens, which is a spectacle lens containing a pigment, wherein, the pigment contains a specific pigment having a maximum absorption wavelength in the range of 400 to 510 nm, the maximum extinction coefficient of the specific pigment within the wavelength range of 550 to 780 nm is 1 / 5 or less of the extinction coefficient of the specific pigment at the maximum absorption wavelength, when the average transmittance of the spectacle lens within the wavelength range of 430 to 480 nm is set as Ta, within the wavelength range of 430 to 480 nm, the transmittance of the spectacle lens at every 5 nm is within the range of Ta ± y, when the average transmittance of the spectacle lens within the wavelength range of 550 to 780 nm is set as Tb, the Tb is greater than the Ta, wherein, y is a value represented by the following formula (1), Formula (1) y = (100% - Ta) × 0.1 wherein, the units of Ta, Tb and y are %.

2. The spectacle lens according to claim 1, wherein, Ta and Tb satisfy the relationship of the following formula (2), Formula (2) 0.1 ≤ (100% - Tb) / (100% - Ta) ≤ 0.

9.

3. The spectacle lens according to claim 1 or 2, wherein, Ta is 2 to 90%.

4. The spectacle lens according to any one of claims 1 to 3, wherein, The pigment contains two or more kinds of the specific pigments.

Images