Method for producing spectacle lens

Abstract

The present disclosure addresses the problem of providing a method for producing a spectacle lens, wherein the method makes it possible to produce a spectacle lens having a topcoat layer that can suppress the occurrence of cracks and the like and that has excellent water repellent properties or hydrophilic properties. A method for producing a spectacle lens according to the present disclosure comprises: a step for bringing into contact a laminate including a spectacle lens base material and an antireflective film having an SiO2 layer on the outermost surface thereof with an alkaline solution having a pH of more than 7.0 but less than 9.8; and a step for obtaining a spectacle lens by forming a topcoat layer on the antireflective film.

Description

Eyeglass lens manufacturing method

[0001] The present disclosure relates to a method for manufacturing eyeglass lenses.

[0002] In Patent Document 1, SiO ２ The method for manufacturing an eyeglass lens having an anti-fogging layer formed on a lens substrate on which an inorganic anti-reflection film having a layer of the above-mentioned formula is formed is as follows: ２ A method is disclosed in which the layer is treated with a strongly basic processing solution containing an inorganic alkali.

[0003] JP 2012-194359 A

[0004] The present disclosure relates to a spectacle lens substrate and a glass substrate having SiO ２ The present invention relates to a method for manufacturing a spectacle lens, the method comprising the step of contacting a laminate including an anti-reflection film having a layer of the formula (I) with an alkaline solution having a pH greater than 7.0 and less than 9.8.

[0005] The present disclosure will be described in detail below. According to the method for manufacturing an eyeglass lens of the present disclosure, it is possible to manufacture an eyeglass lens having a top coat layer that exhibits high water repellency or hydrophilicity while suppressing the occurrence of cracks, etc. The following description of the constituent elements may be based on representative embodiments of the present disclosure, but the present disclosure is not limited to such embodiments.

[0006] In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​written before and after "to" as the lower and upper limits. Furthermore, in this specification, when two or more types of a component are present, the "content" of that component means the total content of those two or more components. In this specification, in a numerical range described in stages, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in a numerical range described in this specification, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the Examples. In this specification, a combination of two or more preferred embodiments is a more preferred embodiment. In this specification, the term "solid content" refers to a component that forms a film and does not include a solvent. Furthermore, a component that forms a film is considered to be a solid content even if it is in a liquid state.

[0007] [Method for manufacturing eyeglass lenses] The method for manufacturing eyeglass lenses according to the present disclosure is a method for manufacturing eyeglass lenses by forming an eyeglass lens substrate and a SiO ２ and a step of forming a top coat layer on the antireflection film to obtain a spectacle lens.

[0008] <<Contacting Step>> [Laminate] The laminate is a spectacle lens substrate and a SiO ２ The anti-reflective coating includes a layer of:

[0009] <Eyeglass Lens Substrate> Materials constituting the eyeglass lens substrate include organic and inorganic materials, with organic materials being preferred. Examples of organic materials include acrylate resins, methacrylate resins, thiourethane resins, allyl resins, episulfide resins, polycarbonates, urethane resins, polyesters, polystyrene, polyethersulfone, poly-4-methylpentene-1, and diethylene glycol bisallyl carbonate resins (CR-39), with thiourethane resins, episulfide resins, and diethylene glycol bisallyl carbonate resins being preferred.

[0010] The thiourethane resin is a resin obtained by polymerizing a polyisocyanate compound and a polythiol compound. Preferred polyisocyanate compounds include m-xylylene 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 tolylene diisocyanate. Preferred polythiol compounds include pentaerythritol tetrakis(3-mercaptopropionate), 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, or 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. The episulfide resin is a resin obtained by ring-opening polymerization of a monomer having an episulfide group (epithio group) or a mixed monomer containing such a monomer. Preferred episulfide group-containing monomers are bis(2,3-epithiopropyl)sulfide or bis(2,3-epithiopropyl)disulfide.

[0011] Examples of spectacle lens substrates include finished lenses in which the convex and concave surfaces are optically finished and molded to match the desired diopter, semi-finished lenses in which only the convex surface is finished as an optical surface (for example, a spherical surface, a rotationally symmetric aspherical surface, and a progressive surface), and semi-finished lenses in which the concave surface is processed and polished to match the wearer's prescription.

[0012] From the viewpoint of ease of handling, the thickness of the spectacle lens substrate is preferably 0.8 to 30.0 mm, more preferably 1.0 to 10.0 mm. The refractive index of the spectacle lens substrate is preferably 1.50 or more, more preferably 1.60 to 1.80, and even more preferably 1.60 to 1.74.

[0013] <Anti-reflection film> The laminate has an SiO ２ The anti-reflection coating has a layer of SiO ２The laminate having the layer is treated with an alkaline solution having a predetermined pH, which will be described later, to form a layer of SiO ２ It is presumed that the surface of the layer is etched to form a fine uneven structure, thereby increasing the surface area. ２ That is, the outermost surface of one of the main surfaces of the laminate is made of SiO ２ The outermost surface of the other main surface may be a layer of SiO ２ and a layer of SiO ２ The anti-reflection film may be a layer other than SiO. ２ The antireflection film may have either a single layer structure or a multilayer structure, and from the viewpoint of antireflection properties, a multilayer structure is preferred. The antireflection film is also preferably an inorganic antireflection film made of an inorganic compound. A multilayer antireflection film preferably has a structure in which low refractive index layers and high refractive index layers are alternately laminated. The low refractive index layers of the multilayer structure are preferably made of SiO ２ Examples of materials constituting the high refractive index layer include oxides of metals selected from titanium, zirconium, aluminum, niobium, tantalum, and lanthanum (e.g., zirconium oxide, titanium oxide, tantalum oxide, and indium tin oxide).

[0014] Examples of methods for forming the anti-reflection film include dry methods such as vacuum deposition, sputtering, ion plating, ion beam assisted deposition, and CVD.

[0015] The thickness of the antireflection film is preferably from 100 to 10,000 nm, more preferably from 300 to 700 nm.

[0016] <Other Layers> The laminate may have layers other than the above-mentioned spectacle lens substrate and anti-reflection film. Examples of the other layers include a primer layer and a hard coat layer.

[0017] (Primer layer) The laminate may have a primer layer. The primer layer is preferably disposed between the eyeglass lens substrate and the hard coat layer described below. In this case, adhesion between the eyeglass lens substrate and the hard coat layer is likely to be improved, and the impact resistance of the eyeglass lens can be improved.

[0018] The primer layer preferably contains a resin. The resin may be in particulate form. Examples of the resin include urethane resin, epoxy resin, phenol resin, polyimide, polyester, bismaleimide resin, and polyolefin, with urethane resin being preferred. The primer layer may contain an additive such as a surfactant.

[0019] Examples of methods for forming a primer layer include a method in which a primer layer-forming composition containing a resin is applied to a desired member to form a coating film, and the coating film is subjected to a curing treatment (e.g., drying treatment) as necessary to form a primer layer. In other words, the primer layer is preferably a layer obtained by applying a primer layer-forming composition to a desired member to form a coating film, and then curing the coating film. Examples of methods for applying the primer layer-forming composition include a dipping coating method, a spin coating method, a spray coating method, an inkjet coating method, and a flow coating method.

[0020] The thickness of the primer layer is preferably 0.3 to 2.0 μm.

[0021] (Hard Coat Layer) The laminate may have a hard coat layer. The hard coat layer is preferably disposed on the primer layer, and more preferably disposed between the primer layer and the anti-reflection film. When the laminate has a hard coat layer, the scratch resistance of the eyeglass lens can be improved. The hard coat layer preferably exhibits a hardness of H or higher in pencil hardness according to JIS K5600. As the hard coat layer, a known hard coat layer can be used, and examples thereof include an organic hard coat layer, an inorganic hard coat layer, and an organic-inorganic hybrid hard coat layer. For example, in the field of eyeglass lenses, an organic-inorganic hybrid hard coat layer is commonly used.

[0022] As a method for forming a hard coat layer, for example, a method can be mentioned in which a composition for forming a hard coat layer is applied to a desired member to form a coating film, and the coating film is subjected to a curing treatment (for example, a light irradiation treatment and a drying treatment) as necessary to form a hard coat layer.In other words, the hard coat layer is preferably a layer obtained by applying a composition for forming a hard coat layer to a desired member to form a coating film, and then curing the coating film.As a method for applying a composition for forming a hard coat layer to a substrate, for example, a method can be mentioned in which the above-mentioned composition for forming a primer layer is applied.

[0023] The thickness of the hard coat layer is preferably from 1 to 20 μm, more preferably from 2 to 18 μm.

[0024] [Alkaline Solution] The alkaline solution used in the contact step has a pH of more than 7.0 and less than 9.8. The pH of the alkaline solution is preferably more than 7.0 and not more than 8.6, and more preferably more than 7.0 and not more than 8.2, in terms of better effects of the present invention. The pH can be measured by the glass electrode method specified in JIS Z8802. Note that the pH is intended to be the value at the temperature when the alkaline solution is brought into contact with the laminate.

[0025] <Alkali Source> The alkaline solution contains an alkali source. The alkali source may be either an inorganic alkali source or an organic alkali source, with inorganic alkali sources being preferred. Examples of inorganic alkali sources include hydrogen carbonates, carbonates, hydrogen phosphates, dihydrogen phosphates, borates, and ammonia. Examples of the salts include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts and magnesium salts, and ammonium salts. Alkali metal salts are preferred, and sodium salts are more preferred. The inorganic alkali source preferably contains at least one selected from the group consisting of hydrogen carbonates, hydrogen phosphates, and dihydrogen phosphates. Examples of the organic alkali source include amine compounds and salts thereof, such as trishydroxymethylaminomethane, 2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid, and 2-amino-2-methyl-1,3-propanediol. Examples of the salts include hydroxide salts, halide salts, and acetate salts.

[0026] The alkali source may be used alone or in combination of two or more. The concentration of the alkali source can be appropriately adjusted so that the pH of the alkaline solution falls within the above-mentioned range, and is preferably 0.01 to 3.0 mol / L, more preferably 0.05 to 1.0 mol / L.

[0027] <Solvent> Examples of the solvent contained in the alkaline solution include water and organic solvents. The solvent preferably contains water, and more preferably water. The organic solvent is preferably a water-miscible organic solvent that is miscible with water in any ratio at 25°C, and more preferably an alcohol. Examples of the alcohol include alkyl alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, hexanol, and octanol; aromatic alcohols such as phenol, cresol, benzyl alcohol, and phenethyl alcohol; alicyclic alcohols such as cyclohexanol; glycols such as ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, diethylene glycol, dipropylene glycol, and triethylene glycol; alkylene glycol monoalkyl ethers; polyalkylene glycols; and polyalkylene glycol monoalkyl ethers. One type of solvent may be used alone, or two or more types may be used in combination.

[0028] The alkaline solution may contain components other than the alkali source and the solvent, such as acidic compounds such as organic acids and their salts, surfactants, preservatives, rust inhibitors, antifoaming agents, and antioxidants.

[0029] The alkaline solution may be a buffer solution exhibiting the above-mentioned pH. Known buffer solutions can be used as the buffer solution. In terms of ease of preparation, preferred are phosphate buffer solutions (containing at least one of sodium dihydrogen phosphate and disodium hydrogen phosphate as an alkaline source), carbonate-bicarbonate buffer solutions (containing at least one of sodium bicarbonate and sodium carbonate as an alkaline source), borate buffer solutions (containing sodium borate as an alkaline source), Tris buffer solutions (containing trishydroxymethylaminomethane as an alkaline source), HEPES buffer solutions (containing 2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid as an alkaline source), and GTA buffer solutions (containing trishydroxymethylaminomethane and 2-amino-2-methyl-1,3-propanediol as alkaline sources, and further containing 3,3-dimethylglutaric acid), and more preferred are phosphate buffer solutions.

[0030] [Procedure] In the contacting step, the laminate is brought into contact with the alkaline solution by a known method, such as an immersion method, an immersion and shaking method, or a spraying method. ２ The contacting step is carried out so that the layer is brought into contact with the alkaline solution. The contacting step may be carried out only once or may be carried out two or more times. When the contacting step is carried out two or more times, the same method may be repeated or different methods may be combined.

[0031] The temperature of the alkaline solution during the contact step is preferably 10° C. or higher and lower than 60° C., more preferably 10° C. or higher and 40° C. or lower, and even more preferably 20° C. or higher and 30° C. or lower. When the temperature is equal to or higher than the lower limit temperature, the treatment time can be shortened, and when the temperature is equal to or lower than the upper limit temperature, cracks in the antireflective film can be further suppressed, which is preferable.

[0032] The contact time in the contact step can be adjusted as appropriate depending on the pH, temperature, etc., but is preferably 48 to 144 hours, more preferably 72 to 96 hours. When the contact time is equal to or greater than the lower limit, the resulting spectacle lens has better water repellency or hydrophilicity, and when the contact time is equal to or less than the upper limit, cracks in the anti-reflection film can be more effectively suppressed, which is more preferable.

[0033] <<Top Coat Layer Formation Step>> In the top coat layer formation step, after the contact step, a SiO 2 layer is formed on the anti-reflection film (more specifically, the SiO 2 layer on the outermost surface after contact with the alkaline solution). ２ A top coat layer is formed on the anti-reflection film (on the layer of the anti-reflection film). It is presumed that the top coat layer formed on the anti-reflection film whose surface has been roughened by the contacting step (i.e., whose surface area has been increased) will have an increased surface area similar to that of the anti-reflection film, and will exhibit excellent water repellency or hydrophilicity. The top coat layer may be either a water-repellent layer or a hydrophilic layer, with a water-repellent layer being preferred. The spectacle lens obtained by the spectacle lens manufacturing method of the present disclosure exhibits excellent water repellency when a water-repellent layer is formed as the top coat layer, and exhibits excellent hydrophilicity when a hydrophilic layer is formed as the top coat layer. The water-repellent layer may also be a water- and oil-repellent layer having oil repellency.

[0034] The top coat layer can be formed, for example, using a composition for forming a top coat layer. Methods for forming the top coat layer include a method of curing a coating film of the composition for forming a top coat layer and a method of vapor-depositing the composition for forming a top coat layer. In other words, examples of the top coat layer include a cured product or vapor-deposited film of the composition for forming a top coat layer, which will be described later.

[0035] More specifically, a method for curing a coating film of the composition for forming a top coat layer includes applying the composition for forming a top coat layer to a desired member to form a coating film, and optionally subjecting the coating film to a curing treatment (e.g., drying treatment) to form a top coat layer. Examples of methods for applying the composition for forming a top coat layer include a dipping coating method, a spin coating method, a spray coating method, an inkjet coating method, and a flow coating method.

[0036] The composition for forming the top coat layer can be deposited by a known method, such as a vacuum deposition method. The vacuum deposition method is a method in which a deposition source is evaporated in a vacuum chamber and attached to the surface of a substrate. The degree of vacuum in the vacuum deposition method is 1.0 × 10 pressure during deposition. －１ Pa or less, and 5.0 × 10 －２ Pa or less is more preferable, and 2.0 × 10 －２ The lower limit is not particularly limited, and is preferably 1.0 × 10 －４ In many cases, the temperature is above 100 Pa.

[0037] Examples of methods for evaporating the evaporation source in the vacuum evaporation method include an electron beam method, a resistance heating method, a heater heating method, and an induction heating method, and the electron beam method is preferred from the viewpoint of energy conversion efficiency.

[0038] The average deposition rate during deposition is preferably 0.1 to 1.5 nm / s, more preferably 0.2 to 1.4 nm. The average deposition rate is the value obtained by dividing the thickness of the deposited film by the deposition time required to form a deposited film of the above thickness (average deposition rate (nm / s) = film thickness (nm) / deposition time (s)).

[0039] The thickness of the top coat layer to be formed is preferably 1 to 1000 nm.

[0040] [Top Coat Layer Forming Composition] The top coat layer forming composition is not particularly limited, and either a water-repellent layer forming composition or a hydrophilic layer forming composition can be used depending on the layer to be formed. The top coat layer forming composition is used to form a SiO 2 layer on the outermost surface of the anti-reflection film. ２ From the viewpoint of adhesion with the layer of SiO ２ Preferably, the reactive group contains a compound having a reactive group capable of reacting with the silicon atom (e.g., a hydroxyl group that may be present on the surface). The reactive group is preferably a hydrolyzable silyl group in which the silicon atom and the hydrolyzable group are directly bonded. Examples of the hydrolyzable group include an alkoxy group, a halogen atom, an amino group, an acyloxy group, an alkenyloxy group, and an isocyanate group. When multiple hydrolyzable groups are directly bonded to one silicon atom, they may be the same or different. Among these, the reactive group is preferably an alkoxysilyl group or a halogenated silyl group, and more preferably an alkoxysilyl group.

[0041] The composition for forming a water-repellent layer preferably contains at least one material selected from the group consisting of a fluorine-containing compound and a silicon-containing compound. From the viewpoint of water repellency, the composition for forming a water-repellent layer preferably contains a fluorine-containing compound, and more preferably contains at least one material selected from the group consisting of fluorine-substituted alkyl group-containing organosilicon compounds, their hydrolysates, and their hydrolysis condensates. The fluorine-substituted alkyl group-containing organosilicon compound is an organosilicon compound containing an alkyl group in which some or all of the hydrogen atoms are substituted with fluorine atoms, and has a hydrolyzable group. The term "hydrolyzate" refers to a compound obtained by hydrolysis of the hydrolyzable group in a compound. The hydrolyzate may be one in which all of the hydrolyzable groups have been hydrolyzed (a complete hydrolyzate) or one in which only a portion of the hydrolyzable group has been hydrolyzed (a partial hydrolyzate). In other words, the hydrolyzate may be a complete hydrolyzate, a partial hydrolyzate, or a mixture thereof. The term "hydrolyzed condensate" refers to a compound obtained by hydrolyzing the hydrolyzable group in a compound and condensing the resulting hydrolyzate. The hydrolysis condensate may be one in which all hydrolyzable groups are hydrolyzed and all of the hydrolyzed products are condensed (complete hydrolysis condensate), or one in which some of the hydrolyzable groups are hydrolyzed and some of the hydrolyzed products are condensed (partial hydrolysis condensate). That is, the hydrolysis condensate may be a complete hydrolysis condensate, a partial hydrolysis condensate, or a mixture thereof.

[0042] Examples of the organosilicon compound include those described in International Publication No. 2020 / 039795, U.S. Patent No. 4,410,563, European Patent No. 0,203,730, European Patent No. 0,749,021, European Patent No. 0,844,265, and European Patent No. 0,933,377, the contents of which are incorporated herein by reference. The material constituting the water-repellent layer may be used alone or in combination of two or more.

[0043] The water-repellent layer-forming composition may contain a solvent. A fluorine-based organic solvent is preferred as the solvent in the water-repellent layer-forming composition. Examples of fluorine-based organic solvents include fluorinated ether-based organic solvents, fluorinated amine-based organic solvents, and fluorinated hydrocarbon-based organic solvents. Examples of fluorinated ether-based organic solvents include hydrofluoroethers such as fluoroalkyl (preferably, perfluoroalkyl groups having 2 to 6 carbon atoms)-alkyl ethers, with ethyl nonafluorobutyl ether or ethyl nonafluoroisobutyl ether being preferred. Examples of fluorinated amine-based organic solvents include amines in which at least one hydrogen atom of ammonia has been substituted with a fluoroalkyl group, with a tertiary amine in which all hydrogen atoms of ammonia have been substituted with a fluoroalkyl group (preferably, perfluoroalkyl groups) being preferred (e.g., tris(heptafluoropropyl)amine, Fluorinert (registered trademark) FC-3283, manufactured by 3M). Examples of the fluorinated hydrocarbon organic solvent include fluorinated aliphatic hydrocarbon solvents such as 1,1,1,3,3-pentafluorobutane (e.g., Solv 55, manufactured by Solvex), and fluorinated aromatic hydrocarbon solvents such as 1,3-bis(trifluoromethylbenzene).

[0044] Examples of the fluorine-based organic solvent include hydrochlorofluorocarbons such as Asahiklin (registered trademark) AK225 (manufactured by AGC), and hydrofluorocarbons such as Asahiklin (registered trademark) AC2000 (manufactured by AGC).

[0045] The composition for forming the hydrophilic layer preferably contains a silicon compound as a material for forming the hydrophilic layer, and more preferably contains a silicon compound containing no fluorine atoms. The composition for forming the hydrophilic layer more preferably contains at least one selected from the group consisting of organosilicon compounds containing no fluorine atoms, their hydrolysates, and their hydrolyzed condensates. The hydrolyzable groups, hydrolysates, and hydrolyzed condensates are as described above. The material for forming the hydrophilic layer may be used alone or in combination of two or more.

[0046] The composition for forming a hydrophilic layer may contain a solvent. Examples of the solvent in the composition for forming a hydrophilic layer include alcohol solvents such as methanol, ethanol, propanol, and butanol, glycol solvents such as ethylene glycol and propylene glycol, glycol ether solvents such as propylene glycol monomethyl ether, ketone solvents such as acetone and methyl isobutyl ketone, ether solvents such as tetrahydrofuran and dioxane, and water. The solvent may be used alone or in combination of two or more.

[0047] <Other Steps> The method for manufacturing a spectacle lens according to the present disclosure may include steps other than the contact step and the top coat layer forming step described above.

[0048] The method may include a step of cleaning the outermost surface of the laminate prior to the contacting step, such as plasma dry cleaning, ozone treatment, or ultrasonic cleaning.

[0049] A rinsing step may be included after the contacting step. The rinsing treatment carried out in the rinsing step can remove excess alkaline solution from the surface of the laminate. A known rinsing method can be used, for example, a method of contacting the laminate with a rinse liquid. The contacting method can be the above-mentioned method of contacting the laminate with an alkaline solution. Examples of the rinsing liquid include water, organic solvents, and mixed solvents thereof. Examples of the organic solvent that can be used include the above-mentioned alcohols and acetone.

[0050] After the contacting step and / or the rinsing step, a drying treatment may be carried out as necessary. Examples of the drying method include spin drying, flowing a dry gas over the workpiece, heating, Marangoni drying, Rotagoni drying, isopropanol drying, and any combination thereof.

[0051] After the contact step and before the top coat layer forming step, a step of forming an intermediate layer may be included. In other words, the top coat layer may be formed directly on the anti-reflective coating, or may be formed via an intermediate layer. By providing an intermediate layer between the anti-reflective coating and the top coat layer, adhesion and scratch resistance are improved.

[0052] The method for forming the intermediate layer includes, for example, a method for forming the intermediate layer using a composition for forming an intermediate layer. As a method for forming the intermediate layer using a composition for forming an intermediate layer, the above-mentioned method for forming a top coat layer can be used. The composition for forming the intermediate layer preferably contains a silicon-containing compound. The silicon-containing compound is a compound capable of forming a silicon-containing compound on the outermost surface of the anti-reflection film. ２ From the viewpoint of adhesion with the layer of SiO ２ It is preferable that the composition for forming the intermediate layer contains a compound having a reactive group capable of reacting with the layer (for example, Si—OH groups that may be present on the surface). Details of the reactive group are as described above. Among other materials constituting the intermediate layer, an aminosilane coupling agent is preferable. The composition for forming the intermediate layer may contain a solvent. Examples of the solvent include the solvents that may be contained in the composition for forming the top coat layer described above.

[0053] [Eyeglass Lens] The eyeglass lens obtained by the method of the present disclosure comprises an eyeglass lens substrate, an SiO 2 film on the outermost surface (the outermost surface on the top coat layer side) treated with the alkaline solution as described above, and a SiO 2 film on the outermost surface (the outermost surface on the top coat layer side). ２ and a top coat layer, in this order. The surface of the top coat layer has excellent water repellency or hydrophilicity, and excellent antifouling or antifogging properties, making it suitable for use as an eyeglass lens.

[0054] The present disclosure will be explained in more detail below using examples, but the present disclosure is not limited to these examples in any way.

[0055] [Preparation of Lens Substrate 1] [Preparation of Alkaline Solution] 21 g of sodium bicarbonate as an alkali source was dissolved in 500 ml of deionized water to prepare a 0.5 mol / L alkaline solution.

[0056] [Treatment of Laminate] As a laminate, a lens with an anti-reflection film (a lens with a configuration in which the top coat layer was removed (originally not attached) from Nikon-Essilor Co., Ltd., trade name ECC) was prepared, which had been cleaned with a plasma dry cleaner (PDC210 manufactured by Yamato Scientific Co., Ltd., 400 W, treatment time 30 seconds). The outermost surface of the anti-reflection film of the anti-reflection film-coated lens was coated with SiO ２ 500 ml of the prepared alkaline solution was placed in a lidded polypropylene container, and the laminate was placed therein and completely immersed. The container was then closed and left to stand at 25° C. for 91 hours. The immersed lens was then washed with tap water, rinsed with deionized water, and dried with an air gun to obtain lens substrate 1.

[0057] [Preparation of Lens Substrates 2-3 and 5-6] Lens substrates 2-3 and 5-6 were prepared in the same manner as lens substrate 1, except that the alkali source, concentration, liquid temperature, and immersion time were changed to those shown in Table 1. When preparing lens substrates 2 and 3, a phosphate buffer solution with a pH of 7.6 or pH 8.0 purchased from Fujifilm Wako Pure Chemical Industries was used as is as the alkaline solution. The alkaline solution used in preparing lens substrate 5 was prepared using commercially available sodium sesquicarbonate. When preparing lens substrate 6, deionized water was used as is without adding an alkali source.

[0058] [Lens Substrate 4] A laminate prepared in the same manner as Lens Substrate 1 was used as is to form a topcoat layer without being brought into contact with an alkaline solution.

[0059] The composition of the alkaline solution and the treatment conditions are shown in Table 1. The pH values ​​in the table are those at the liquid temperatures shown in the table below.

[0060]

[0061] [Preparation of Spectacle Lenses] [Preparation of Top Coat Layer-Forming Composition] 0.1 g of a fluorine-substituted alkyl group-containing organosilicon compound (KY-164 manufactured by Shin-Etsu Chemical Co., Ltd.) was dissolved in 100.0 g of a fluorine-based organic solvent (AC-2000 manufactured by AGC Inc.) to obtain a top coat layer-forming composition having a solids concentration of 0.1 mass %.

[0062] Example 1 Lens substrate 1 was cleaned using a plasma dry cleaner (Yamato Scientific PDC210, 400 W, treatment time: 30 seconds). A top coat layer-forming composition was coated onto the cleaned anti-reflection film by spin coating (1000 rpm for 30 seconds, followed by 2000 rpm for 1 second). The lens was then heated in a 50°C thermostatic chamber for 30 minutes to form a top coat layer (water- and oil-repellent layer), and the eyeglass lens of Example 1 was obtained.

[0063] Examples 2 to 3, Comparative Examples 1 and 3 Spectacle lenses of Examples 2 to 3 and Comparative Examples 1 and 3 were obtained in the same manner as in Example 1, except that the lens substrate was changed to one shown in Table 2.

[0064] Comparative Example 2 Lens substrate 5 of Comparative Example 2 had unacceptable cracks or defects in the anti-reflection film, so no topcoat layer was formed.

[0065] [Evaluation] (Appearance) The appearance of the anti-reflective coating on the lens substrate after contact with the prepared alkaline solution was compared with that before contact and visually evaluated as follows: No change in appearance: No alteration of the anti-reflective coating was observed. Slight change in appearance: The alteration of the anti-reflective coating was slight enough to pose no practical problem. Crack: Linear cracks were observed in the anti-reflective coating. Point-like defects: Circular corrosion was observed in the anti-reflective coating.

[0066] (Water Contact Angle of Top Coat Layer) The water contact angle of the top coat layer surface at room temperature (25°C) was measured by the following method: The top coat layer surface was wiped with a Kimwipe soaked in acetone and then dried with an air gun, and the water contact angle of the central part at room temperature (25°C) was measured using a contact angle meter (DM500, manufactured by Kyowa Interface Science Co., Ltd.).

[0067] [Results] The evaluation results are shown in Table 2. The spectacle lens of Comparative Example 2 had defects in the antireflection film, and a topcoat layer could not be formed, so that the water contact angle could not be measured (evaluation "-").

[0068]

[0069] As shown in Table 2, it was confirmed that the spectacle lenses manufactured by the spectacle lens manufacturing method of the present disclosure suppressed the occurrence of cracks and had excellent water repellency. In contrast, the spectacle lens of Comparative Example 1, which was not contacted with an alkaline solution, and the spectacle lens of Comparative Example 3, which was contacted with a solution of pH 7.0 or less, had poor water repellency. Furthermore, the spectacle lens of Comparative Example 2, which was contacted with an alkaline solution of pH 9.8 or more, developed defects such as cracks. A comparison of Examples 1 to 3 confirmed that the appearance of the anti-reflection film was better when an alkaline solution of pH greater than 7.0 and equal to or less than 8.2 was used.

Claims

1. Glasses lens substrate and SiO on the outermost surface ２ and forming a top coat layer on the antireflection film to obtain a spectacle lens.

2. The method for manufacturing eyeglass lenses according to claim 1, wherein the temperature of the alkaline solution is 10°C or higher and lower than 60°C.

3. The method for manufacturing eyeglass lenses according to claim 1 or 2, wherein the alkaline solution contains an inorganic alkaline source.

4. The method for manufacturing a spectacle lens according to claim 3, wherein the inorganic alkali source comprises at least one selected from the group consisting of hydrogen carbonate, dihydrogen phosphate, and hydrogen phosphate.

5. The method for manufacturing eyeglass lenses according to any one of claims 1 to 4, wherein the pH of the alkaline solution is greater than 7.0 and not greater than 8.

2.

6. The method for manufacturing a spectacle lens according to any one of claims 1 to 5, wherein the top coat layer is a water-repellent layer.

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