JPH02160201A - Production of dyeable antirelective lens - Google Patents

Abstract

PURPOSE:To improve an antireflection function and dyeability by forming plural layers of antireflection films consisting of a high-refractive index layer contg. a metal compd. and a low-refractive index layer consisting of a compsn. contg. silica by coating of a liquid material. CONSTITUTION:The layer which consists of the component contg. the metal compd. and has a relatively high refractive index is first provided on a lens base material consisting of a dyeable material by using a coating method of a liquid material. The layer which has a relatively low refractive index and is in contact with the above-mentioned layer having the high refractive index is made of the component having colloidal silica. The layer which contains the colloidal silica and has a relatively low refractive index is then provided thereon by using the coating method of the liquid material. Namely, the multi- layered coating is executed by using the liquid coating materials which are different in the refractive index; further, the colloidal silica is incorporated into the layer having the high refractive index. Therefore, the layer displays the antireflection function and dyeability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing dyeable antireflection lenses.

[Prior Art] Lenses for spectacles have a problem in that when they are worn, reflection of light rays causes reflected images called ghosts, flares, etc., which give discomfort to the eyes. As a method for improving these, a method has conventionally been used in which an antireflection film is formed on the lens base layer. Various proposals have also been made regarding anti-reflection film forming methods (Optical Technology) Contact Vol.
, 9. no. 8°17-23 (1971)).

On the other hand, as eyeglass lenses have become more fashionable in recent years, there has been an increasing demand for colored lenses, especially for so-called half-colored lenses, in which the lenses are colored in shades of light and shade (usually the upper part is darker).

In order to satisfy both the anti-reflection function and the coloring of the lens as described above, the conventional method has been to dye the lens base material in advance or color the lens base material by dyeing the lens base material, and then color the lens base material. This means applying anti-reflection treatment.

However, the antireflection colored lenses formed by this method have the following problems.

(1) When forming an anti-reflection film by vapor deposition, a high degree of vacuum is required, so the color density of the colored lens that must be processed;
The hue changes before and after anti-reflection processing, resulting in poor reproducibility.

■ When forming an anti-reflection film using a coating method using a liquid substance, the color density and hue of the tinted lens may change due to shedding of the colored substance when the colored lens is immersed in the liquid substance, chemical changes in the colored substance due to the liquid substance, etc. However, there is a change before and after anti-reflection treatment.

(3) In either the vapor deposition method or the liquid substance coating method, the formation of the anti-reflection film is carried out afterward, and therefore it is difficult to meet various demands regarding coloring.

(4) If a mistake is made in the anti-reflection processing process, it will be difficult to reproduce it, and this will have a significant impact on costs.

Further, a technique of forming a surface coating on the lens surface and dyeing the coating is also being considered.

JP-A-49-14139 proposes a hard coating consisting of a single layer film of 0.3 microns or more made of a silicon compound on an acrylic substrate.

As another known example, a technique has been proposed in which at least two coating layers are formed on a base material and cross-linked and cured by irradiation with active energy rays (Japanese Unexamined Patent Application Publication No. 1983-1993).
-145246).

As another known example, a technique has been proposed in which a hard polysiloxane coating is provided on a base material and a patterned article is obtained by dyeing or the like (Japanese Patent Laid-Open Publication No. 30677/1983).

[Problems to be Solved by the Invention] However, the technique disclosed in JP-A No. 49-14139 is difficult to dye, and the total light transmittance is limited to about 94.5%, making it difficult to obtain desirable antireflection properties. The problem was that it could not be done.

Furthermore, the two or more layers of the technique disclosed in JP-A-50-145246 change the concentration of the photosensitizer, making it difficult to effectively prevent reflection.

Furthermore, since the technique described in JP-A-50-145246 is a single-layer coating, the antireflection effect is not satisfactory. That is, none of these three known examples can be expected to have an antireflection effect.

Furthermore, in JP-A No. 57-37301, a hard coat layer of synthetic resin is provided on the surface of the lens base material, and an antireflection layer consisting of a single layer or a multilayer synthetic resin layer is provided on this hard coat layer. Synthetic resin lenses are described. However, these known examples do not contain any description of colloidal silica, and therefore have the problem of poor dyeability.

The present invention aims to solve these problems, and aims to provide a method for manufacturing an antireflection lens that can be dyed with high density and has a high antireflection effect.

Furthermore, the key technology of the present invention, which was completely unimaginable in the prior art, is to perform multilayer coating using liquid coating materials with different refractive indexes, and to further contain colloidal silica in the layer having a higher refractive index. , to exhibit anti-reflection function and dyeability.

[Means to solve the problem] The present invention has the following configuration to achieve the above object.

[In a method for manufacturing a lens consisting of a lens base material and an anti-reflection film on its surface, a lens base material made of a dyeable material is first coated with a liquid substance coating method to coat a lens base material made of a component containing a metal compound. at least one layer having a high refractive index is provided on the layer, and the eyebrow in contact with at least a layer having a relatively low refractive index of the layer having a high refractive index is made of a component containing colloidal silica; 1. A method for producing a dyeable antireflection lens, characterized in that at least one layer containing colloidal silica and having a relatively low refractive index is provided using a material coating method. "The dyeable lens base material here refers to plastic materials such as diethylene glycol bisallyl carbonate polymer, polycarbonate, polyurethane, epoxy resin, polystyrene and its copolymers, polymethyl methacrylate and its copolymers, etc. It also includes glass that has been treated to be dyeable. Furthermore, in the case of substrates that cannot be dyed, such as inorganic glass, those coated with dyeable coating materials can also be included in the dyeable lens substrates of the present invention.

Examples of dyeable covering materials include USP 4°211.
．． A suitable example is the dyeable highly hardened coating described in 823. Furthermore, these dyeable highly hardened coatings are expected to improve various physical properties such as adhesion, hardness, chemical resistance, and durability when plastic is used as a lens base material.

Dyeing as used in the present invention includes dyeing the lens and/or the entire anti-reflection film using organic dyes such as disperse dyes, basic dyes, acid dyes, and metal complex dyes, as well as blurring dyeing with gradual shading. This also includes pattern dyeing using transfer paper. In addition, the dyes used for dyeing are prepared in advance by water, glue, dyeing aid, surfactant, leveling agent, and P.
The properties should be controlled according to the purpose using an H regulator or the like. On the other hand, it is also possible to easily improve the dyeing properties by adding various organic chemicals called carriers for the purpose of increasing the dyeing speed, dyeing density, etc. Alternatively, prepare a viscous paste-like dye mixture using the method described above, and use it to directly color the anti-reflection coating using a screen printing method, or use the dye paste to create a pattern on a flexible material such as paper, cloth, or film. The dye layer is printed on a reflective base material and pasted onto the anti-reflective film to create a close contact between the dye layer and the surface of the anti-reflective film, and then dried at a temperature of 60 to 200°C for 10 minutes to 2 hours. Patterns can be dyed by applying heat or moist heat treatment to transfer and fix the dye to the coating film. After dyeing, the excess dye paste and dye support layer may be removed by washing with hot water or water.

In addition, dyes include not only colored dyes that absorb in the visible region, but also photochromic dyes that develop color when exposed to ultraviolet light.
This also includes fluorescent dyes that emit fluorescence.

As a method for forming an antireflection film, a method using a liquid substance coating is used because it is simple and, in the case of plastic substrates, prevents cracks that occur during dyeing due to differences in linear expansion coefficients.

In addition, the liquid composition for forming a film that imparts antireflection properties by coating with a liquid substance may include not only a film-forming substance, but also various volatile solvents to impart the necessary coating workability. Those containing can also be used.

Here, the liquid composition is a composition having a viscosity within a range to which ordinary coating operations can be applied, and is 10 poise or less, preferably 1 poise or less at the application temperature. That is, with a liquid composition having a viscosity higher than this, it may be difficult to obtain a uniform coating film. As the coating method, methods used in ordinary coating operations can be used, but curtain flow coating, dip coating, spin coating, etc. are preferable from the viewpoint of controlling the thickness of the thin film.

The anti-reflection film referred to in the present invention is a film that provides an anti-reflection effect to a transparent substrate by forming a plurality of thin layers with relatively different refractive indexes, and has a relatively high refractive index. At least one layer made of a component containing a metal compound is disposed on a base material, and further, a layer in contact with a layer having a relatively low refractive index of the layer having a high refractive index contains silica. It is necessary that the layer consists of components. Furthermore, at least one layer containing silica and having a relatively low refractive index is disposed on the surface side as well. Preferred specific examples include a film having a high refractive index obtained from an alkoxide or chelate compound of titanium or zirconium, an epoxy resin, and colloidal silica, and a film having a high refractive index obtained from colloidal silica and the general formula R' R2b Si (OR) 4=-). Examples include a combination with a film having a low refractive index and containing as a main component a hydrolyzate of an organosilicon compound represented by: In this case, it goes without saying that the selection of the thickness and refractive index of each coating is important in order to maximize the antireflection effect.

Specific examples of titanium and zirconium alkoxides or chelate compounds for forming the coating having a high refractive index include titanium tetraethoxide, titanium tetra-1-propoxide, titanium tetra-n-propoxide, titanium tetraethoxide, and titanium tetraethoxide. n-butoxide, titanium tetra-5
ec-butoxide, titanium tetra-1 crt-butoxide, zirconium tetraethoxide, zirconium tetramypropoxide, zirconium tetra-n-propoxide, zirconium tetra-n-butoxide, zirconium tetra-5ee-butoxide, zirconium tetra-1erl-butoxide metal alcoholate compounds such as di-isopropoxytitanium bisacetylacetonate, di-butoxytitanium bisacetylacetonate, jetoxytitanium bisacetylacetonate, bisacetylacetone zirconium, tri-n-butoxide zirconium monoethylacetoacetate, etc. Examples include chelate compounds.

In addition, the general formula R' R25i (OR), which is used to form a film with a low refractive index, is expressed in Table a.
b 4-a-b In the organosilicon compound to be used, R1 and R2 each have an alkyl group, an alkenyl group, an allyl group, or a halogen group, an epoxy group, an amino group, a mercapto group, a methacryloxy group or a cyano group. It represents a hydrogen group, and R is an alkyl group, alkoxyalkyl group, or acyl group having 1 to 8 carbon atoms, and a and b are 0 or 1. Among these organosilicon compounds, a composition containing a compound containing an epoxy group is effective in producing the antireflection colored lens of the present invention.

Specific representative examples of these organosilicon compounds include:
Glycidoxymethyltrimethoxysilane, glycidoxymethyltriethoxysilane, α-glycidoxyethyltrimethoxysilane, α-glycidoxyethyltriethoxysilane, β-glycidoxyethyltrimethoxysilane, β-glycid xyethyltriethoxysilane, α-glycidoxypropyltrimethoxysilane, α-glycidoxypropyltriethoxysilane, β-glycidoxypropyltrimethoxysilane, β-glycidoxypropyltriethoxysilane, γ-glycid Xypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltripropoxysilane, γ-glycidoxypropyltributoxysilane, γ
- glycidoxypropyltrimethoxyethoxysilane,
γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltriphenoxysilane, α-glycidoxybutyltrimethoxysilane, α-glycidoxybutyltriethoxysilane, β-glycidoxybutyltrimethoxysilane , β-glycidoxybutyltriethoxysilane, γ-glycidoxybutyltrimethoxysilane,
γ-glycidoxybutyltriethoxysilane, δ-glycidoxybutyltrimethoxysilane, δ-glycidoxybutyltriethoxysilane, (3,4-epoxycyclohexyl)methyltrimethoxysilane, (3,4-epoxycyclohexyl) hexyl)methyltriethoxysilane, β-
(3,4-Epoxycyclohexyl)ethyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltripropoxysilane, β-(3,
4-Epoxycyclohexyl)ethyltributoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxyethoxysilane, β-(3,4-epoxycyclohexyl)ethyltriphenoxysilane, γ-(3
,4-epoxycyclohexyl)propyltrimethoxysilane, γ-(3,4-epoxycyclohexyl)propyltriethoxysilane, β-(3,4-epoxycyclohexyl)butyltrimethoxysilane, β-(3,4-epoxycyclohexyl)butyltrimethoxysilane,
-Epoxycyclohexyl)butyltriethoxysilane, glycidoxymethylmethyldimethoxysilane, glycidoxymethylmethyljethoxysilane, α-glycidoxyethylmethyldimethoxysilane, α-glycidoxyethylmethyljethoxysilane, β-glycidoxyethylmethyljethoxysilane, Sidoxyethylmethyldimethoxysilane, β-glycidoxyethylmethyljethoxysilane, α-glycidoxypropylmethyldimethoxysilane, α-glycidoxypropylmethyljethoxysilane, β-glycidoxypropylmethyljethoxysilane, β-glycidoxypropylmethyljethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyljethoxysilane, γ-glycidoxypropylmethyldipropoxysilane, γ-glycidoxypropylmethyl Dibutoxysilane, γ-glycidoxypropylmethyldimethoxyethoxysilane, γ-glycidoxypropylmethyldiphenoxysilane, γ-glycidoxypropylethyldimethoxysilane, γ-glycidoxypropylethyljethoxysilane, γ-glycidoxypropylmethyldimethoxysilane Epoxy group-containing organosilicon compounds such as sidoxypropylvinyldimethoxysilane, γ-glycidoxypropylvinyljethoxysilane, γ-glycidoxypropylphenyldimethoxysilane, γ-glycidoxypropylphenyldiethoxysilane, and their Hydrolyzate, methyl silicate, ethyl silicate, n-
Propyl silicate, i-propyl silicate, n-butyl silicate, 5ec-butyl silicate and t-
Tetraalkoxysilanes such as butyl silicate, and their hydrolysates, as well as methyltrimethoxysilane, methyltriethoxysilane, methyltrimethoxyethoxysilane, methyltriacetoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxy Silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, vinyltrimethoxyethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriacetoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropyl Triethoxysilane, γ-chloropropyltriacetoxysilane, 3.3.3-trifluoropropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane,
γ-Mercaptopropyltriethoxysilane, N-β(
aminoethyl)-γ-aminopropyltrimethoxysilane, β-cyanoethyltriethoxysilane, methyltriphenoxysilane, chloromethyltrimethoxysilane,
Trialkoxy, triazyloxy or triphenoxysilanes such as chloromethyltriethoxysilane or their hydrolysates, and dimethyldimethoxysilane, phenylmethyldimethoxysilane, dimethyljethoxysilane, phenylmethyljethoxysilane, γ-chloropropylmethyl Dimethoxysilane, γ-chloropropylmethyldiethoxysilane, dimethyldiacetoxysilane,
γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyljethoxysilane, γ-mercaptopropylmethyldimethoxysilane,
γ-Mercaptopropylmethyljethoxysilane, γ-
Examples include dialkoxysilanes or diacyloxysilanes such as aminopropylmethyldimethoxysilane, γ-aminopropylmethyljethoxysilane, methylvinyldimethoxysilane, methylvinyljethoxysilane, or hydrolysates thereof.

It is also possible to add one type or two or more types of these organosilicon compounds.

These organosilicon compounds are preferably used after being hydrolyzed in order to lower the curing temperature and further promote curing.

Hydrolysis is produced by adding and stirring pure water or an acidic aqueous solution such as hydrochloric acid, acetic acid, or sulfuric acid. Furthermore, the degree of hydrolysis can be easily controlled by adjusting the amount of pure water or acidic aqueous solution added. During hydrolysis, it is particularly preferable to add pure water or an acidic aqueous solution in an amount equal to or more than 3 times the mole of the alkoxy group, from the viewpoint of accelerating curing.

During hydrolysis, alcohol and other substances are produced, so it is possible to hydrolyze without a solvent, but in order to make the hydrolysis more uniform, it is preferable to mix the organosilicon compound and a solvent before hydrolysis. is also possible. Depending on the purpose, it is also possible to remove an appropriate amount of the hydrolyzed alcohol etc. under heating and/or reduced pressure before use, and it is also possible to add an appropriate solvent afterwards.

Examples of these solvents include alcohols, esters, ethers, ketones, halogenated hydrocarbons, and aromatic hydrocarbons such as toluene and xylene. Moreover, these solvents can also be used as a mixed solvent of two or more types as required. Furthermore, depending on the purpose, it is possible to accelerate the hydrolysis reaction and further advance reactions such as precondensation by heating above room temperature, or to suppress precondensation, the hydrolysis temperature can be lowered to below room temperature. Needless to say, it is possible to do so.

In the present invention, the lens provided with the antireflection layer on the lens base material needs to have a total light transmittance of 94.8% or more as a whole. When it is less than 94.8%, ghosts, flares, etc. occur, and there is virtually no antireflection function. Furthermore, this is to ensure high transparency and maintain transparency even when dyed in subsequent steps.

The colored lenses with antireflection properties obtained by the manufacturing method of the present invention not only have improved reproducibility compared to conventional lenses, but also have the advantage of being able to quickly respond to various customer requests. . This means that, for example, lenses that have been pre-treated with anti-reflection treatment can be dyed according to the customer's preference at the optician's counter.

The lenses referred to in the present invention include not only lenses for eyeglasses such as sunglasses, fashion glasses, safety glasses, and corrective lenses, but also ski goggles and the like.

[Examples] The present invention will be explained in detail below with reference to Examples, but the present invention is not limited thereto.

Example 1 (1) Preparation of first layer coating composition Colloidal silica (average particle size 12±1 mμ, solid content 30%) dispersed in 168.6 g of acetylacetone and 0.10 g of silicone surfactant and methanol under stirring (average particle size 12±1 mμ, solid content 30%) 18 Add .0g. After sufficient stirring, 15.5 g of tetra-n-butyl titanate was further added and sufficiently stirred to obtain a coating composition.

■ Preparation of second layer coating composition (it) Preparation of silane hydrolyzate γ-glycidoxypropyltrimethoxysilane 56.5
19.8 g of a 0.05N hydrochloric acid aqueous solution was added dropwise to 24.0 g of vinyltriethoxysilane and mixed with stirring while controlling the temperature at 10°C.

After the dropwise addition was completed, stirring was continued for an additional hour at room temperature to obtain a silane hydrolyzate.

(b) Preparation of coating composition Add n-
150.5 g of propatool, 71.2 g of water, 23.9 g of ethyl cellosolve, 32.5 g of the same methanol-dispersed colloidal silica used in Example 1, 0.22 g of silicone surfactant, and 0.98 g of aluminum acetylacetonate. A coating composition was obtained by stirring and mixing thoroughly.

(3) Coating and curing First, using the paint prepared in the previous section (1), a diethylene glycol bisallyl carbonate polymer lens (diameter 75 mm, thickness 2
．． in+m, CR-39 Praruns) under the following conditions. The coated lens was dried by heating at 90° C. for 1 hour.

Spin cord conditions Rotation speed: 3500 rpm Rotation time: 60 seconds After heating and drying, immerse in hot water at 40°C for 1 hour, and then
It was dried by heating at 0° C. for 1 hour.

The second layer coating composition prepared in (2) and (b) above was further spin-coated on the obtained first scrap under the same conditions as the first layer, and after coating, it was dried in a hot air dryer at 93°C for 2 hours. Heat curing was performed.

(4) The total light transmittance of the lens obtained as a result of the test was 96.7%, and it was an antireflection lens having a reddish-purple reflected light color. The total light transmittance of the lens before antireflection treatment was 92.6%. In addition, this anti-reflection lens was dyed using a dyeing bath in which a disperse dye containing three colors of red, blue, and yellow was dispersed and dissolved in water.
Staining was carried out at 0°C for 30 minutes. This lens was dyed to a total light transmittance of 40.6%. Furthermore, the antireflection effect did not decrease at all even after dyeing.

Example 2 (1) Preparation of undercoating composition (a) Preparation of silane hydrolyzate γ-glycidoxypropylmethyljethoxysilane 10
6.8 g was cooled to 10° C., and while stirring, 15.5 g of a 0.05 N aqueous hydrochloric acid solution was gradually added dropwise. After the dropwise addition was completed, stirring was continued for an additional hour at room temperature to obtain a silane hydrolyzate.

(b) Preparation of coating composition The silane hydrolyzate was added to 25 g of epoxy resin (“Epicote 827”, manufactured by Shell Chemical Co., Ltd.), 25 g of epoxy resin (“Epolite 3002”, manufactured by Kyoeisha Yushi Kagaku Kogyo Co., Ltd.), and diacetone. Alcohol 58.9g,
Benzyl alcohol 29.5g, methanol 310g
, 1.5 g of silicone surfactant was added and mixed, and 416.7 g of methanol-dispersed colloidal silica used in Example 1 and aluminum acetylacetonate 12
．． After adding 5 g and stirring thoroughly, a coating composition was prepared.

2) Undercoat application, curing and pretreatment The coating composition described above was applied to the diethylene glycol bisallyl carbonate polymer lens used in Example 1 by a dipping method, and heated at 93°C for 4 hours. The cured lens was pretreated using a surface treatment plasma device (PR501A manufactured by Yamato Scientific Co., Ltd.) for 2.5 minutes at an oxygen flow rate of 100 m1/min and an output of 50 W.

(3) Manufacture and test results of antireflection film The same procedure as in Example 1 was conducted except that the undercoated lens was used.

The total light transmittance of the obtained lens was 96.2%, and the color of the reflected light was reddish-purple. Furthermore, when the abrasion resistance of the obtained lens was examined using #0O00 steel wool, almost no scratches were observed even after abrasion.

In addition, this anti-reflection lens was dyed at 90°C using a dye bath containing a disperse dye containing three colors of red, blue, and yellow dispersed and dissolved in water.
Stained for 30 minutes. This lens was dyed to a total light transmittance of 54.9%. Furthermore, the antireflection effect was not reduced at all even after dyeing.

Incidentally, the total light transmittance of the lens formed only by undercoat treatment was 92.78%.

Comparative Example 1 In Example 2, an undercoated lens was previously dyed with a red dye, and then an antireflection film was produced in exactly the same manner as in Example 2. Elution of the dye was observed in the first coating composition. , the solution turned red.

Example 3 The same procedure as in Example 2 was carried out except that the lens used was changed to a diethylene glycol bisallyl carbonate polymer lens having a lens power of -4,00 diopters.

The obtained lens had exactly the same performance as Example 2.

Example 4 The same procedure as in Example 2 was carried out except that the lens used was changed to a diethylene glycol bisallyl carbonate polymer lens with a lens power of +2.00 diopters.The obtained lens had exactly the same performance as in Example 2. It was something.

Example 5 The lens used is an inorganic glass lens (65 mm in diameter.

Thickness 2. Everything was carried out according to Example 2 except that 0 mm) was used.

The total light transmittance of the obtained lens was 94.8%, and when it was dyed for 3 hours, it was dyed to 70.0%. The total light transmittance of the untreated lens is 91.
It was 9%.

Comparative Example 2 A paint was prepared according to Example 2 of JP-A-49-14139. That is, vinyltriethoxysilane 190
After hydrolyzing a solution of 136 parts by weight of methyltrimethoxysilane and 40 parts by weight of glacial acetic acid with a 0.02N aqueous hydrochloric acid solution, 10 parts by weight of n-butyl silicate was added to the solution.
A liquid obtained by hydrolyzing 8 parts by weight of ethyl alcohol and 40 parts by weight of ethyl alcohol was mixed, and further 2.0 parts by weight of sodium acetate and 20 parts by weight of benzyl alcohol were added and completely dissolved to form a paint. This paint was applied to a "CR-39" lens under the same conditions as the first layer of Example 1 and cured by heating. The hardness, scratch resistance, and solvent resistance of the obtained lens were favorable, but the total light transmittance was 94.5%, which was inferior to those of Examples 1 to 5. has almost no dye permeability and dyeability (and could not be dyed).

Comparative Example 3 In Example 1, except for the colloidal silica contained in both the first layer and the second layer, the thickness of each layer was optimized to obtain the maximum transmittance.
Everything was carried out in the same manner as in Example 1. As a result, the total light transmittance of the obtained lens was 97.3%, but the total light transmittance after dyeing was 93.0%, making it completely impractical as a dyed lens. Ta.

[Effects of the Invention] The present invention provides a high refractive index layer containing a metal compound, in which at least the layer in contact with the low refractive index layer contains silica, and a low refractive index layer containing a composition containing silica. Since a multi-layer anti-reflection coating consisting of a refractive index layer is formed by coating with a liquid substance, lenses of a certain quality can be manufactured easily and efficiently, and the resulting lenses also have anti-reflection properties. It is excellent and can be dyed at high concentration.

Claims (1)

[Claims] (1) In a method for manufacturing a lens consisting of a lens base material and an anti-reflection film on its surface, a liquid substance coating method is first applied to the lens base material made of a dyeable material to form a component containing a metal compound. At least one layer having a relatively high refractive index is provided, and at least the layer in contact with the layer having a relatively low refractive index of the layer having a high refractive index is made of a component containing colloidal silica, A method for producing a dyeable antireflection lens, characterized in that a liquid material coating method is then used to provide at least one layer containing colloidal silica and having a relatively low refractive index.