阅读说明：本技术 涂布组合物、眼镜镜片及眼镜镜片的制造方法 (Coating composition, spectacle lens, and method for producing spectacle lens ) 是由 石崎贵子 滨窪胜史 田崎奈津美 于 2019-03-29 设计创作，主要内容包括：本发明提供：〔1〕一种涂布组合物,其含有无机氧化物粒子(A)、具有有机硅烷部位的环氧化合物(b1)、具有3个以上环氧基的丙三醇均聚物脱水甘油醚(b2)、以及光阳离子聚合引发剂(C)；〔2〕一种眼镜镜片,其具备将上述〔1〕所述的涂布组合物固化而成的硬涂层、和基材；以及〔3〕一种眼镜镜片的制造方法,该方法具备将上述〔1〕所述的涂布组合物涂敷在基材上的工序,以及通过照射光将涂敷后的涂布组合物固化的工序。(The present invention provides: [ 1] A coating composition comprising inorganic oxide particles (A), an epoxy compound having an organosilane moiety (b1), glycerol homopolymer dehydrated glycerol ether having 3 or more epoxy groups (b2), and a photo-cationic polymerization initiator (C); [ 2] an eyeglass lens comprising a hard coat layer obtained by curing the coating composition according to [ 1] and a base material; and [3 ] a method for producing an eyeglass lens, comprising a step of applying the coating composition according to [ 1] above to a base material, and a step of curing the applied coating composition by irradiating light.)

1. A coating composition comprising inorganic oxide particles (A), a silane coupling agent (b1) having an organosilane site and an epoxy group, a glycerol homopolymer dehydrated glycerol ether (b2) having 3 or more epoxy groups, and a photo-cationic polymerization initiator (C).

2. The coating composition of claim 1,

the glycerol homopolymer dehydrated glycerol ether (b2) has an epoxy equivalent of 150 g/equivalent or more.

3. The coating composition of claim 1 or2, wherein,

the glycerol homopolymer dehydrated glycerol ether (b2) has a viscosity of 1000 mPas to 8000 mPas.

4. The coating composition according to any one of claims 1 to 3, wherein,

the inorganic oxide particles (A) are at least 1 selected from silica particles and zirconia particles.

5. The coating composition according to any one of claims 1 to 4,

the inorganic oxide particles (A) have a light transmittance of 50% or less at a wavelength of 660nm in an affinity test with a dipentaerythritol acrylate compound.

6. The coating composition according to any one of claims 1 to 5, wherein,

the glycerol homopolymer dehydrated glycerol ether (b2) has 4 or more epoxy groups.

7. An eyeglass lens comprising a hard coat layer obtained by curing the coating composition according to any one of claims 1 to 6, and a base material.

8. A method for manufacturing an eyeglass lens, comprising:

a step of applying the coating composition according to any one of claims 1 to 6 to a substrate; and

and curing the coated coating composition by irradiating the coating composition with light.

Technical Field

The present application relates to a coating composition, a spectacle lens having a coating layer obtained by curing the coating composition, and a method for producing the spectacle lens.

Background

Plastic spectacle lenses are lightweight and have excellent impact resistance as compared with glass, but have insufficient surface hardness, and therefore, the scratch resistance is improved by coating the surface with various hard coatings.

The curing method of the coating composition to be formed into a hard coat layer can be roughly classified into thermal curing and photo curing.

In the case of heat curing, although a high scratch resistance improving effect can be obtained, the curing treatment time is long and the pot life is short.

On the other hand, in the case of photocuring, the curing treatment time is short and the productivity is high, but on the other hand, the scratch resistance tends to be inferior to that of thermal curing. In particular, various photocurable coating compositions have been proposed for the advantage of productivity, but it can be said that it is difficult to achieve both abrasion resistance and adhesion to various substrates.

Patent document 1 relates to a method for producing a plastic lens for spectacles coated with a photocurable hard coating film having excellent abrasion resistance and adhesion, and describes a method in which a photocurable coating liquid containing (a) a compound having at least 2 (meth) acryloyl groups in the molecule, (B) an ionic photopolymerization initiator, and (C) metal oxide particles is applied to the surface of a plastic substrate, and is photocured by irradiation with radiation.

Patent document 2 describes a coating composition for an optical member, which can form a coating layer having abrasion resistance and weather resistance and can be cured in a short time, and which contains an epoxy group-containing compound, a photocationic polymerization initiator, an organic solvent, and inorganic fine particles dispersed in the organic solvent.

Disclosure of Invention

Problems to be solved by the invention

However, from the viewpoint of scratch resistance, further improvement is required for the hard coat layers obtained by the techniques of patent documents 1 and 2.

Embodiments of the present invention relate to a coating composition capable of forming a hard coating layer having excellent scratch resistance, an eyeglass lens having the hard coating layer, and a method for manufacturing the eyeglass lens.

Means for solving the problems

Embodiments of the present application relate to [ 1] to [3 ] below.

A coating composition comprising inorganic oxide particles (A), an epoxy compound (b1) having an organosilane site, glycerol homopolymer dehydrated glycerol ether (b2) having 3 or more epoxy groups, and a photo-cationic polymerization initiator (C).

[ 2] an eyeglass lens comprising a hard coat layer obtained by curing the coating composition according to [ 1] and a base material.

[3 ] A method for manufacturing an eyeglass lens, comprising:

a step of applying the coating composition according to [ 1] above to a substrate; and

and curing the coated coating composition by irradiating the coating composition with light.

ADVANTAGEOUS EFFECTS OF INVENTION

The embodiments of the present application described above can provide a coating composition capable of forming a hard coating layer having excellent scratch resistance, an eyeglass lens having the hard coating layer, and a method for producing the eyeglass lens.

Detailed Description

[ coating composition ]

The coating composition according to the embodiment of the present application contains inorganic oxide particles (a), an epoxy compound (b1) having an organic silane site (hereinafter also referred to as "silane coupling agent (b 1)"), glycerol homopolymer dehydrated glycerol ether (b2) having 3 or more epoxy groups, and a photo-cationic polymerization initiator (C).

According to the coating composition of the above embodiment, by containing the glycerol homopolymer dehydrated glycerin ether (b2) in combination with other components, a hard coat layer excellent in scratch resistance can be formed.

The meaning of the terms used in the present specification will be described below.

The "amount of solid component" in the coating composition means the amount of the component other than the solvent.

The "number of carbon atoms" of a group having a substituent means the number of carbon atoms of a portion other than the substituent.

< inorganic oxide particle (A) >)

Examples of the inorganic oxide particles (a) include: silica particles, titania particles, alumina particles, zirconia particles, iron oxide particles, antimony oxide particles, tin oxide particles, tungsten oxide particles. Among these, at least 1 kind selected from silica particles and zirconia particles is preferable, and silica particles are more preferable, from the viewpoint of obtaining more excellent scratch resistance. These particles may be used alone in 1 kind, or may be used in combination in 2 or more kinds.

The inorganic oxide particles may be surface-treated with an organic treating agent.

The average particle diameter of the inorganic oxide particles (a) is preferably 1nm or more, more preferably 5nm or more, further preferably 8nm or more, and is preferably 100nm or less, more preferably 50nm or less, further preferably 30nm or less, from the viewpoint of increasing the film hardness and suppressing the haze (haze) of the film itself.

Here, the average particle diameter of the inorganic oxide particles (a) is a value calculated from an adsorption isotherm using nitrogen gas and from specific surface area data obtained by a BET (Brunauer-Emmett-Teller equalisation) multipoint method.

In the affinity test with a dipentaerythritol acrylate compound, the light transmittance of the inorganic oxide particles (a) at a wavelength of 660nm may be 50% or less.

According to this affinity test, an index of affinity or compatibility with the multifunctional acrylate can be obtained. The light transmittance of 50% or less means that the affinity of the inorganic oxide particles with the polyfunctional acrylate is low, but according to the coating composition of the present embodiment, even when such inorganic oxide particles are used, excellent scratch resistance and an effect of suppressing tackiness can be obtained.

From the viewpoint of obtaining more excellent scratch resistance, the light transmittance of the inorganic oxide particles (a) at a wavelength of 660nm in an affinity test with a dipentaerythritol acrylate compound is preferably 45% or less, more preferably 40% or less, further preferably 30% or less, and further preferably 25% or less.

The affinity test of the dipentaerythritol acrylate compound was carried out using the dipentaerythritol acrylate compound R-1 shown below, and more specifically, the method described in the examples.

The content of the inorganic oxide particles (a) is preferably 10% by mass or more, more preferably 20% by mass or more, further preferably 30% by mass or more, and preferably 80% by mass or less, more preferably 70% by mass or less, further preferably 60% by mass or less, further preferably 50% by mass or less, relative to the amount of solid components in the entire coating composition.

The inorganic oxide particles may be used by mixing an inorganic oxide sol obtained by dispersing the inorganic oxide particles (a) in an organic solvent in the coating composition.

Examples of the organic solvent used in the inorganic oxide sol include: ether solvents, ester solvents, acetal solvents, nonpolar solvents. Specific examples of the organic solvent include propylene glycol monomethyl ether (hereinafter, also referred to as "PGM"), methyl ethyl ketone, and ethylene glycol mono-n-propyl ether.

Examples of commercially available products of the inorganic oxide particles (a) include: the trade name "V-8804" manufactured by Nissan chemical industries, Ltd., the trade name "PGM-ST", "PGM-AC-2140Y", and "MEK-EC-2130Y".

By using the inorganic oxide sol, the inorganic oxide particles are dispersed in a colloidal state in the coating composition, and the effect of suppressing the occurrence of the inorganic oxide particles unevenly distributed in the coating film is exhibited.

< silane coupling agent (b1) >

The silane coupling agent (b1) is added for curing the coating composition.

In order to obtain excellent scratch resistance, the silane coupling agent (b1) used in the coating composition has an organosilane moiety and an epoxy group. The organosilane site means a site having a silicon-carbon bond. An epoxy group refers to a three-membered ring moiety formed by carbon-oxygen.

The silane coupling agent (b1) is preferably a compound represented by formula (1),

[ chemical formula 1]

[ in the formula, R¹Is a C1-20 valent hydrocarbon group having an epoxy group or a substituent containing the group, R²Is alkyl, aryl, aralkyl, or acyl, R³Is an alkyl group, an aryl group, an aralkyl group or an acyl group, m is an integer of 1 to 4, and n is an integer of 0 to 3. Wherein (m + n) is an integer of 3 or less. And (c) a temperature sensor.

As R¹Examples of the functional group of (3) include: epoxy group, glycidyloxy group.

R¹The hydrocarbon group (b) has preferably 2 or more, more preferably 3 or more, and preferably 15 or less, more preferably 12 or less, and further preferably 10 or less carbon atoms. The number of carbon atoms refers to the total number of carbon atoms of the substituent-containing hydrocarbon group.

AsR¹Examples thereof include: gamma-glycidoxymethyl, gamma-glycidoxyethyl, gamma-glycidoxypropyl, beta-epoxycyclohexylmethyl, beta-epoxycyclohexylethyl, beta-epoxycyclohexylpropyl.

R²And R³The alkyl group (C) is preferably a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms.

As R²And R³Examples of the alkyl group of (b) include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, cyclopentyl, cyclohexyl.

R²And R³The aryl group of (2) is preferably an aryl group having 6 to 10 carbon atoms. Examples of the aryl group include: phenyl, tolyl.

R²And R³The aralkyl group (2) is preferably an aralkyl group having 7 to 10 carbon atoms. Examples of the aralkyl group include: benzyl, phenethyl.

R²And R³The acyl group is preferably an acyl group having 2 to 10 carbon atoms. Examples of the acyl group include: acetyl group.

Of these, R²And R³Preferably methyl, or ethyl.

m is preferably an integer of 1 to 3, more preferably an integer of 1 or2, and further preferably 1.

n is preferably an integer of 0 to 3, more preferably an integer of 0 or 1, and further preferably 0.

The presence of a plurality of R in the compound of formula (1)¹When a plurality of R is present¹Optionally the same or different from each other. With respect to R²And R³The same applies.

Examples of the silane coupling agent (b1) include: 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-ethyl-3- { [3- (triethoxysilyl) propoxy ] methyl } oxetane. Of these, 3-glycidoxypropyltrimethoxysilane is preferred.

From the viewpoint of improving the scratch resistance, the content of the silane coupling agent (b1) is preferably 5% by mass or more, more preferably 10% by mass or more, further preferably 15% by mass or more, further preferably 20% by mass or more, and is preferably 60% by mass or less, more preferably 50% by mass or less, further preferably 40% by mass or less, further preferably 30% by mass or less, relative to the amount of solid components in the entire coating composition.

The silane coupling agent (b1) and the silane coupling agent (b 1') containing at least 1 selected from a vinyl group, a methacryloyl group and an acryloyl group may be used in combination.

Examples of the silane coupling agent (b 1') include: vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane.

The content of the silane coupling agent (b 1') is preferably 1% by mass or more, more preferably 3% by mass or more, and still more preferably 5% by mass or more, and is preferably 50% by mass or less, more preferably 30% by mass or less, and still more preferably 20% by mass or less, relative to the amount of solid components in the entire coating composition.

< Glycerol homopolymer dehydrated Glycerol Ether (b2) >)

The coating composition contains glycerol homopolymer dehydrated glyceryl ether (b2) having 3 or more epoxy groups from the viewpoint of obtaining excellent scratch resistance and from the viewpoint of suppressing stickiness. By selecting the glycerol homopolymer dehydrated glycerin ether (b2) from the polyfunctional epoxy compounds, an excellent scratch resistance effect and a tack inhibiting effect can be obtained.

From the viewpoint of further improving scratch resistance and from the viewpoint of further suppressing tackiness, the glycerol homopolymer dehydrated glycerin ether (b2) preferably has 4 or more epoxy groups.

From the viewpoint of further improving the scratch resistance and from the viewpoint of further suppressing the tackiness, the epoxy equivalent of the glycerin homopolymer dehydrated glycerin ether (b2) is preferably 150 g/equivalent or more, more preferably 160 g/equivalent or more, further preferably 170 g/equivalent or more, further preferably 180 g/equivalent or more, and preferably 250 g/equivalent or less, more preferably 220 g/equivalent or less, further preferably 200 g/equivalent or less.

The method for measuring the epoxy equivalent was in accordance with the method defined in JIS K7236: 2001.

From the viewpoint of further improving the scratch resistance and from the viewpoint of further suppressing the viscosity, the viscosity of the glycerol homopolymer dehydrated glycerol ether (b2) is preferably 1000mPa · s or more, more preferably 2000mPa · s or more, further preferably 3000mPa · s or more, further preferably 4000mPa · s or more, and preferably 8000mPa · s or less, more preferably 7000mPa · s or less, further preferably 6000mPa · s or less, further preferably 5000mPa · s or less.

The viscosity is a value measured at 25 ℃ using an E-type viscometer.

The content of the glycerol homopolymer dehydrated glycerol ether (b2) is preferably 10% by mass or more, more preferably 15% by mass or more, further preferably 20% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, further preferably 30% by mass or less, relative to the amount of the solid components in the entire coating composition.

< other polyfunctional epoxy Compound (b3) >)

The coating composition may contain another polyfunctional epoxy compound (b3) different from the glycerol homopolymer dehydrated glycerol ether (b 2).

Examples of the polyfunctional epoxy compound (b3) include: sorbitol polyglycidyl ether, pentaerythritol polyglycidyl ether, trimethylolpropane polyglycidyl ether, resorcinol diglycidyl ether, neopentyl glycol diglycidyl ether, 1, 6-hexanediol diglycidyl ether, hydrogenated bisphenol a diglycidyl ether, ethylene-polyethylene glycol diglycidyl ether, propylene-polypropylene glycol diglycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, glycidyl ether of phenol polyethylene oxide adduct, p-tert-butylphenyl glycidyl ether, glycidyl ether of lauryl alcohol polyethylene oxide adduct, polybutadiene diglycidyl ether.

The content of the other polyfunctional epoxy compound (b3) is preferably 1% by mass or more, more preferably 3% by mass or more, and further preferably 5% by mass or more, and is preferably 30% by mass or less, more preferably 20% by mass or less, and further preferably 10% by mass or less, relative to the amount of the solid components in the entire coating composition.

< cationic photopolymerization initiator (C) >)

The photo cation polymerization initiator (C) is a compound that generates cations or lewis acids by irradiation of active energy rays such as ultraviolet rays or electron beams to initiate polymerization of monomers such as epoxy compounds and oxetane compounds.

The photo cation polymerization initiator (C) is preferably a compound that generates cations or Lewis acids by irradiation with ultraviolet light having a wavelength of 400 to 315nm in order to minimize the influence of light irradiation on the lens base material.

Examples of the photo cation polymerization initiator (C) include sulfonium salt and iodineSalts, diazonium salts, and the like.

Examples of sulfonium salts include: triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrakis (pentafluorophenyl) borate, diphenyl-4- (phenylthio) phenylsulfonium hexafluorophosphate, diphenyl-4- (phenylthio) phenylsulfonium hexafluoroantimonate, 4 ' -bis (diphenylsulfonium) -diphenyl sulfide bis-hexafluorophosphate, 4 ' -bis (di (. beta. -hydroxyethoxy) phenylsulfonium ] -diphenyl sulfide bis-hexafluoroantimonate, 4 ' -bis (di (. beta. -hydroxyethoxy) phenylsulfonium ] -diphenyl sulfide bis-hexafluorophosphate, 7- [ di (p-benzoyl) sulfonium ] -2-isopropylthioxanthone hexafluoroantimonate, 7- [ di (p-benzoyl) sulfonium ] -2-isopropylthioxanthone tetrakis (pentafluorophenyl) borate, and mixtures thereof, Triaryl sulfonium salts such as 4-phenylcarbonyl-4 ' -diphenylsulfonium diphenyl sulfide hexafluorophosphate, 4- (p-tert-butylphenylcarbonyl) -4 ' -diphenylsulfonium diphenyl sulfide hexafluoroantimonate, and 4- (p-tert-butylphenylcarbonyl) -4 ' -di (p-benzoyl) sulfonium diphenyl sulfide tetrakis (pentafluorophenyl) borate.

As iodine

Salts, for example: diphenyl iodideTetrakis (pentafluorophenyl) borate, diphenyl iodide

Hexafluorophosphate and diphenyl iodide

Hexafluoroantimonate, bis (4-tert-butylphenyl) iodide

Hexafluorophosphate, bis (4-tert-butylphenyl) iodide

Hexafluoroantimonate, tolyl-cumene-based iodide

Tetrakis (pentafluorophenyl) borate, 4-methylphenyl) [4- (2-methylpropyl) phenyl]Hexafluorophosphate, bis (4-nonylphenyl) iodideHexafluorophosphate, bis (4-alkylphenyl) iodide

Diaryl iodides such as hexafluorophosphateAnd (3) salt.

Examples of diazonium salts include, for example: diazobenzene hexafluoroantimonate, diazobenzene hexafluorophosphate, and the like.

Examples of commercially available products of the photo cation polymerization initiator (C) include those manufactured by ADEKA, ADEKA OPTOMER SP-100, SP-150, SP-152, SP-170, SP-172; photo initiator2074 manufactured by Rhodia corporation; kayarad PCI-220, PCI-620, manufactured by Nippon Chemicals, Inc.; irgacure 250, manufactured by Ciba Japan; manufactured by San Apro corporation, CPI-100P, CPI-110P, CPI-101A, CPI-200K, CPI-210S; and WPI-113 and WPI-116, manufactured by Wako pure chemical industries, Ltd; BBI-102, BBI-103, TPS-102, TPS-103, DTS-102, DTS-103, and the like, manufactured by Green Chemistry Co., Ltd.

Of these, the photo-cationic polymerization initiator is preferably a sulfonium salt, more preferably diphenyl-4- (phenylthio) phenylsulfonium hexafluorophosphate, or diphenyl-4- (phenylthio) phenylsulfonium hexafluoroantimonate.

The content of the photo cation polymerization initiator (C) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, further preferably 1% by mass or more, and preferably 10% by mass or less, more preferably 8% by mass or less, further preferably 7% by mass or less, relative to the total amount of the silane coupling agent (b1), glycerol homopolymer dehydrated glycerol ether (b2), and other polyfunctional epoxy compound (b 3).

< leveling agent >

In order to improve wettability during coating and form a uniform film, it is preferable to add a leveling agent to the coating composition. As the leveling agent, various leveling agents can be used, and among them, a polyoxyalkylene-dimethylpolysiloxane copolymer (for example, trade name "Y-7006", manufactured by Dow Corning Toray Co., Ltd.) is preferably used. The amount of the leveling agent to be added to the coating composition may be adjusted depending on the viscosity, wettability and the like of the composition, and may be set to 0.01 to 1 mass%, for example. The amount of the leveling agent in the coating composition may be set to 0.02 to 2 mass%, for example, relative to the total solid content of the coating composition.

In order to form a uniform film, an organic solvent may be contained in the coating composition.

The organic solvent is preferably at least 1 selected from the group consisting of ether solvents, ester solvents, acetal solvents, and nonpolar solvents, and specific examples thereof include propylene glycol monomethyl ether (hereinafter also referred to as "PGM"), methyl ethyl ketone, and ethylene glycol mono-n-propyl ether.

In addition to the above components, known additives such as an ultraviolet absorber, an infrared absorber, a light stabilizer, an antioxidant, a dye, a pigment, a photochromic agent, and an antistatic agent may be blended in the coating composition.

The amount of the solid component in the coating composition is preferably 10% by mass or more, more preferably 20% by mass or more, and still more preferably 30% by mass or more, and also preferably 70% by mass or less, more preferably 60% by mass or less, and still more preferably 55% by mass or less, relative to the entire composition.

The mass ratio of the filler to the matrix (hereinafter also referred to simply as "F/M") in the coating composition is preferably 0.4 to 1.8, more preferably 0.6 to 1.4, and still more preferably 0.6 to 1.2.

The filler/matrix mass ratio is a mass ratio of the total amount of the inorganic oxide particles (a) to the total amount of the silane coupling agent (b1), glycerol homopolymer dehydrated glycerin ether (b2), and other polyfunctional epoxy compounds (b 3).

The coating composition is obtained by mixing the above components. The method for producing the coating composition includes, for example, a step of adding and stirring and mixing the inorganic oxide particles (a), the silane coupling agent (b1), the glycerol homopolymer dehydrated glyceryl ether (b2), the other polyfunctional epoxy compound (b3) used as needed, the organic solvent, and the photo cation polymerization initiator (C).

The coating composition can be used for the formation of a hard coating for an ophthalmic lens.

[ method for producing spectacle lens ]

From the viewpoint of obtaining excellent scratch resistance, the method for producing a spectacle lens according to the embodiment includes: a step of applying the coating composition to a substrate; and curing the coated coating composition by irradiating light. Since the cured film is cured by irradiation with light, the cured film can be formed in a short time.

Glass may be used as the base material, and plastic such as a synthetic resin substrate is particularly preferably used.

Examples of the plastic for the substrate include: methyl methacrylate, a copolymer of methyl methacrylate and 1 or more other monomers, diethylene glycol bisallylcarbonate, a copolymer of diethylene glycol bisallylcarbonate and 1 or more other monomers, polycarbonate, polystyrene, polyvinyl chloride, unsaturated polyester, polyethylene terephthalate, polyurethane, polythiourethane, a sulfide resin by an ene-thiol reaction, and a sulfur-containing vinyl polymer.

As a method for applying the coating composition to the substrate, a dipping method, a spin method, a spray method, and the like can be used as a commonly performed method, and the dipping method and the spin method are preferable in terms of surface accuracy.

Before the coating material is applied to the substrate, chemical treatment using an acid, an alkali, various organic solvents, physical treatment using plasma, ultraviolet rays, or the like, or cleaning treatment using various detergents may be performed.

The hard coat layer can be formed by irradiating the coating composition with light and curing the light.

As the light source of light, a known light source can be used without any limitation, and specific examples thereof include an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a xenon lamp, a carbon arc lamp, a germicidal lamp, an electrodeless lamp, and the like.

The light is preferably ultraviolet light. The wavelength of the ultraviolet ray is preferably 315 to 400 nm.

The method for manufacturing a spectacle lens may further comprise a step of heating at 50 to 200 ℃ after the step of curing.

The heating temperature is preferably 60 to 180 ℃, more preferably 70 to 150 ℃, and further preferably 80 to 130 ℃.

The heating time is preferably 30 minutes to 3 hours, more preferably 40 minutes to 2 hours, and further preferably 45 minutes to 1.5 hours.

The thickness of the hard coat layer is preferably 0.5 to 50 μm, more preferably 0.5 to 20 μm, and further preferably 1 to 5 μm.

In the above-described manufacturing method, the interference fringe-reducing layer may be further formed. The interference fringe reducing layer is provided for suppressing the occurrence of interference fringes on the surface of the spectacle lens.

From the viewpoint of more significantly preventing the occurrence of interference fringes, the interference fringe-reducing layer preferably satisfies the following conditions 1 and 2.

< Condition 1 > refractive index n of interference fringe-reducing layer_pSatisfies the following formula (I).

(n_s·n_H)^1/2+|n_s-n_H|/4≥n_p≥(n_s·n_H)^1/2-|n_s-n_H|/4(I)

(n_sIs the refractive index of the plastic substrate, n_HRefractive index of hard coating layer)

< Condition 2 > the film thickness d of the interference fringe-reducing layer satisfies the following formula (II).

d＝λ/(4n_p)(II)

(λ is the wavelength of visible light, i.e., 450 to 650nm)

The interference fringe-reducing layer can be obtained by the same method as the formation of the coating layer described above.

In order to suppress interference fringes, the physical film thickness of the interference fringe-reducing layer is preferably 50 to 100nm, and more preferably 60 to 95 nm.

In the above-described manufacturing method, an antireflection film may be further formed on the hard coat layer.

The structure of the antireflection film is not particularly limited, and a single layer or a multilayer film made of a conventionally known inorganic oxide can be used.

As the multilayer film, it is conceivable to use SiO so that the wavelength λ of incident light is λ/4- λ/2- λ/4₂Film and ZrO₂The films are alternately laminated.

The hard coat layer formed by coating and curing the coating composition has excellent abrasion resistance and adhesion to a substrate.

[ spectacle lenses ]

In order to obtain excellent scratch resistance, the spectacle lens of the embodiment preferably includes a hard coat layer obtained by curing the coating composition of the embodiment described above and a substrate, and more preferably includes a hard coat layer obtained by curing the coating composition of the present application, an antireflection film on the hard coat layer, and a substrate.