JPH1026703A - Water-repellent lens - Google Patents

Abstract

(57) [Summary] (Glasses) A lens substrate is made of the following [I],
A lens comprising a water-repellent layer formed of an uncured substance and having a contact angle of 80 ° or more by treating with a water-repellent agent comprising [II] or [III]. [I] a composition comprising an organopolysiloxane having neither a hydroxyl group nor a hydrolyzable group and an acid catalyst; [II] a monofunctional organosilane compound having a fluorinated organic group; [III] a general formula [Rf A silazane compound represented by R ₂ Si] ₂ NH; wherein R f is a fluorinated organic group, R is a monovalent hydrocarbon group, and two Rs may be the same or different [Effect] Since the water repellent does not have a functional group or is monofunctional, the pot life of the water repellent is long.
Even when I blow my breath, the pad marks during the balling work do not come out white. There is no dust, the appearance is beautiful, and there is a sense of quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-repellent lens such as an eyeglass lens.

[0002]

2. Description of the Related Art Lenses such as spectacle lenses and camera lenses are articles closely adhered to daily life, and are used in various ways. For example, there are many opportunities for rain.
At this time, if the lens is made of glass, or an antireflection film (especially, the uppermost layer is made of a silicon oxide-based inorganic material layer) is formed, or if the lens becomes dirty, the surface becomes hydrophilic. However, there were drawbacks that the raindrops did not fall off easily and the light was hard to pass straight. That is, in the case of the spectacle lens, there is a first problem that the scene is not clearly seen.

[0003] In the case of spectacle lenses, a retail store performs an operation called balling in which the lens is cut in accordance with the shape of the frame. At this time, the operation is performed while pouring muddy water containing abrasive grains into the lens. . When the balling of one of the left and right lenses is completed, the balling of the remaining lens is performed next. At this time, the water attached to the surface of the lens that has finished the balling becomes dry. To clean
Naturally, it is wiped off by rubbing with a cloth containing alcohol, acetone or the like. However, even if it looks clean at first glance, there is a second problem that the water mark comes out white when the breath is blown.
This water mark is commonly referred to as "water scorch", similar to glass water scorch.

In order to solve these problems, an organic polysiloxane polymer having a hydroxyl group as a water repellent (1)
Alternatively, it has been proposed to use a perfluoroalkyl group-containing compound (2) and form an organic-containing cured material layer made of a polymer obtained by polymerizing these on the lens substrate surface (Japanese Patent Publication No. 6-5324). .

[0005]

According to the prior art, the water repellent in the form before the water repellent treatment is polymerizable regardless of the polymer (1) or the compound (2). By curing the liquid agent on the lens surface, a cured material layer is formed. However, it has been found that the prior art has a problem that the pot life (usable period) of the water repellent is short. In particular, since the compound (2) having a perfluoroalkyl group is expensive, the disadvantage that the pot life is short for the lens manufacturer was an important problem. This is because the pot life of water-repellents has recently become a particular problem, as the recent trend is that water is repellent after receiving an order from a retail store.

[0006] In the prior art, since curing is performed on the lens surface, shrinkage distortion accompanying curing is likely to occur, and if it occurs, optical performance is degraded, resulting in a problem that defective products increase. Further, the prior art may, in some cases,
There is also a problem that the surface becomes soft or sticky feeling remains, so that dust easily adheres.

[0007]

Accordingly, the present invention provides the following lens. 1. The following lens substrate [I], [II] or [III]
By using a water-repellent agent consisting of a non-cured substance, the contact angle is 80 ° or more (preferably 90 ° C or more)
A lens having a water-repellent layer formed thereon (claim 1). [I] a composition comprising an organopolysiloxane having neither a hydroxyl group nor a hydrolyzable group and an acid catalyst; [II] a monofunctional organosilane compound having a fluorinated organic group; [III] a general formula [Rf A silazane compound represented by R ₂ Si] ₂ NH; wherein R f is a fluorinated organic group, R is a monovalent hydrocarbon group, and two Rs may be the same or different ) 2. The compound of the above [III] is represented by the general formula (1):

[0008]

Embedded image

(Where n is an integer of 4 or more, m is 2 or 3)
It is. The lens according to claim 1, wherein the lens is a silazane compound represented by the following formula: 3. The silazane compound, _{[C 8 F 17 C 3 H 6} (CH 3) 2 Si ] according to claim 2, wherein the lens which is a ₂ NH (claim 3). 4. The lens according to claim 1, further comprising an antireflection film between the lens substrate and the water-repellent layer. 5. The lens according to claim 4, wherein the antireflection film has a silicon oxide-based inorganic material layer at least as an uppermost layer. 6. The lens according to claim 1, further comprising a hard coat layer between the lens substrate and the water-repellent layer or the antireflection film (claim 6). 7. The lens according to claim 6, further comprising an impact absorbing layer between the lens substrate and the hard coat layer. 8. 7. The lens according to claim 6, wherein a difference in refractive index between the lens substrate and the hard coat layer is zero or 0.05 or less. 9. The lens according to claim 7, wherein a difference in refractive index between the lens substrate and the shock absorbing layer is zero or 0.05 or less. 10. 10. The hard coat layer comprises a cured product of a hydrolyzed partial condensate of at least one organic silane compound represented by the following general formula (3).
The lens according to any one of claims 1 to 10 (claim 10). R ¹ _a Si (OR ² ) _4-a (3) (wherein, R ¹ is an alkyl group, an alkenyl group, an aryl group or a halogen, an amino group, a mercapto group, a (meth) acryloxy group, a cyano group, glycidyl group, a glycidoxy group, a hydrocarbon group substituted with a mercapto group or an epoxy group, is bonded to Si by a carbon atom, R ²
Is an alkyl group having 1 to 8 carbon atoms, an allylalkyl group, an alkoxyalkyl group, an alkenyl group, an aryl group or an acyl group, and a is 0 or 1. ) 11. The silane compound has a glycidyl group, a glycidoxy group or an epoxy group.
The lens according to claim 11. 12. The lens according to claim 10, wherein the hard coat layer contains inorganic fine particles of 1 to 200 nm. 13. The impact absorbing layer or the primer layer is 1 to 200 n
10. The lens according to claim 7 or claim 9, comprising m inorganic fine particles. 14． 14. The lens according to claim 12, wherein the inorganic fine particles are silicon oxide when the refractive index of the lens substrate is as low as 1.56 or less.
4). 15. When the refractive index of the lens substrate is as high as 1.56 or more, the inorganic fine particles may be zinc, aluminum, antimony, yttrium, ytterbium, iridium,
Indium, erbium, osmium, cadmium, gadolinium, gallium, gold, silver, chromium, germanium, cobalt, samarium, dysprosium, zirconium, mercury, scandium, tin, strontium, cesium, cerium, thallium, tungsten, tantalum,
Metals selected from titanium, thulium, technetium, iron, terbium, tellurium, copper, thorium, lead, niobium, nickel, neodymium, platinum, vanadium, hafnium, palladium, barium, bismuth, molybdenum or lanthanum, alloys of such metals, The lens according to claim 10 or 11, wherein the metal is a compound, an oxide, a chloride or an amphoteric compound of the metal. 16. The lens according to any one of claims 1 to 15, wherein the water-repellent layer is partially formed when viewed from above. 17． The lens according to claim 1, wherein the lens base is made of plastic. 18. The lens according to any one of claims 1 to 13 or 15 to 17, wherein the lens substrate has a refractive index of 1.6 or more. 19. 19. The lens according to claim 18, wherein the lens substrate has a refractive index of 1.7 or more.
9). 20. 20. The lens according to claim 1, wherein the reflectance of the antireflection film is 2% or less. 21. The lens according to claim 1, wherein the lens substrate is an aspheric lens. 22. 22. The lens according to claim 1, wherein the lens is for two-point glasses.
2).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) Lens substrate: From the viewpoint of use, the type of lens may be any type of lens such as a spectacle lens, a camera lens, a telescope, a binocular lens, a magnifying glass, and a periscope lens. In particular, a lens that is frequently rained is suitable.

The lens may have any shape such as a spherical surface, an aspherical surface, a convex surface, a concave surface, and a flat surface, and may have a shape such as a multifocal lens or a progressive lens. However, the effect of the present invention is particularly effective for an aspherical surface with high surface accuracy and two-point glasses for which the appearance is important. The material of the lens may be glass or plastic. The latter is preferred for spectacle lenses. In the case of plastic, as a material name, it is naturally preferable to use a transparent material. However, celluloid, cellulose acetate, cellulose propionate, cellulose butyrate, 6-nylon, 6,6-nylon,
Aliphatic polyamides such as 2-nylon, aromatic polyamides, ABS, AS resin, polyolefins such as polystyrene, polyethylene (low or high density), polypropylene, polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer, Saturated polyester such as polyvinyl alcohol, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, aromatic polyester, polyether ketone, polyether ether ketone, polysulfone, polyethersulfone, polyetherimide, polyarylate, polymethylpentene, ionomer , Liquid crystal polymer, polyimide, polyamide imide, fluororesin, polyphenylene sulfide, (modified) polyphenylene oxide,
Thermoplastic resin such as thermoplastic polyurethane, or epoxy resin, unsaturated polyester, thermosetting polyurethane, polyimide, diethylene glycol bisallyl car
Polymer of Bonate (commonly called CR-39) (Halogenated)
(Co) polymer of di (meth) acrylate of bisphenol A, (co) polymer of urethane-modified di (meth) acrylate of (halogenated) bisphenol A, diacrylate compound, vinylbenzyl alcohol and unsaturated thiol compound And a thermosetting resin such as a copolymer thereof. The thermosetting resin literally includes not only a thermosetting resin but also an acrylic or other photosetting thermosetting resin which is cured by light.

The polymer of CR-39 has long been used as a material for eyeglass lenses, but has a low refractive index of 1.50.
For this reason, concave lenses (for correcting myopia) tend to be disliked because the edge thickness increases when the power is high. Later, plastics with a high refractive index were developed, and 1.6 years ago.
More than zero, more recently more than 1.70 plastic materials have also been developed.

It is preferable to provide a hard coat layer on the lens substrate, preferably via an impact absorbing layer. Before forming these layers, the lens substrate may be roughened by plasma treatment or alkali treatment to increase the adhesion. (2) Shock absorbing layer: The purpose of the shock absorbing layer is to improve the shock resistance of the lens. In the eyeglass lens industry, it is sometimes called a “primer layer”. P since last year
Since the L law is also enforced in Japan and the United States has FDA standards, a lens with high impact resistance is preferable when considering export to the United States.

As such a shock absorbing layer, a material having a relatively soft elasticity is selected from the above-mentioned materials for the base material. For example, ethylene-vinyl acetate copolymer, polyvinyl alcohol, polyacetal, polyvinyl butyral, thermoplastic polyurethane, thermosetting polyurethane and the like are used. The raw material components for producing a thermoplastic or thermosetting polyurethane are polyether polyols (for example, polyethylene glycol and polypropylene glycol) and polyester polyols, and polyisocyanates.

A primer layer may be formed between the impact absorbing layer and the substrate in order to improve the adhesion between the impact absorbing layer and the substrate. In order to form a primer layer in this sense, for example, (1) a resin material similar to the hard coat layer described below or (2) a functional group such as an epoxy group, an amino group, a vinyl group,
An organic silane compound having a methacryl group (silane coupling agent) can be used.

In order to improve the characteristics of the shock absorbing layer or to improve the refractive index to a predetermined value, these resins may contain inorganic fine particles of 1 to 200 nm.
The content is 5 to 80% by weight, preferably 10 to 70% by weight. It is preferable that the difference in the refractive index between the lens substrate and the shock absorbing layer is zero or 0.05 or less. If the thickness (thickness) of the layer is not uniform when the difference is large, there is a disadvantage that interference fringes are easily generated. When a layer is formed by the immersion method, the thickness (film thickness) of the layer tends to be non-uniform due to the influence of gravity. When the refractive index of the substrate is as low as 1.56 or less, the inorganic fine particles are preferably inexpensive silicon dioxide. When the refractive index of the substrate is as high as 1.56 or more, in order to increase the refractive index of the layer, the inorganic fine particles,
Zinc, aluminum, antimony, yttrium, ytterbium, iridium, indium, erbium, osmium, cadmium, gadolinium, gallium, gold,
Silver, chromium, germanium, cobalt, samarium, dysprosium, zirconium, mercury, scandium,
Tin, strontium, cesium, cerium, thallium, tungsten, tantalum, titanium, thulium, technetium, iron, terbium, tellurium, copper, thorium,
Metals selected from lead, niobium, nickel, neodymium, platinum, vanadium, hafnium, palladium, barium, bismuth, molybdenum or lanthanum, alloys of the metals, compounds of the metals, oxides of the same (for example, titanium oxide, silicon oxide , Tin oxide, iron oxide, zirconium oxide), chloride or amphoteric compound.

In order to increase the adhesion between the resin (vehicle component) constituting the layer and the inorganic fine particles, a silane coupling agent such as vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxy is used. It is preferable to use silane, γ-aminopropyltriethoxysilane and the like in combination. The impact absorbing layer is a solution of the resin (vehicle component) constituting the layer or a low-molecular-weight resin itself, which itself is in a liquid state, so that a coating solution is prepared in a solvent-free form, and a curing catalyst is appropriately added thereto.
It is applied by a method such as an immersion method, a brush coating, a spin coating, a spray coating, a flow coating, and the like.
C. or lower is preferred). After drying, the resin may be further cured by heat treatment (preferably at 120 ° C. or lower).

The thickness of the shock absorbing layer depends on its purpose.
0.01 µm to 50 µm, preferably 0.3 µm to 2 µm. (3) Hard coat layer: The purpose of the hard coat layer is to improve the scratch resistance of the lens. When the base material is plastic or when an impact absorbing layer is provided, the hard coat layer may be provided. preferable.

As a constituent material of the hard coat layer, a thermosetting resin such as a melamine resin and an acrylic resin is used. In particular, since a material having a high surface hardness is preferable, the hard coat layer is preferably made of a cured product of an organic silane compound represented by the following general formula (3) and / or a partial hydrolyzate thereof. R ¹ _a Si (OR ² ) _4-a (3) (wherein, the meanings of R ¹ , R ² and a are as described above.) Of these silane compounds, trifunctional (a = 1) Examples of methyltrimethoxysilane, methyltriethoxysilane, methyldimethoxyethoxysilane, methyltriacetoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyldimethoxyethoxysilane, ethyltriacetoxysilane, Ethyltributoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, vinyldimethoxyethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriacetoxysilane, γ-chloropropyltrimethoxysilane, γ- Chloroprop Triethoxysilane, .gamma.-chloropropyl triacetoxy silane,
3,3,3-trifluoropropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane,
γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, aminomethyltrimethoxysilane, N-β (aminomethyl) -γ-aminopropyltrimethoxysilane, β-cyanoethyltriethoxysilane, γ-mercaptopropyltri Ethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ
-Glycidoxypropyltriethoxysilane, γ-glycidoxypropyldimethoxyethoxysilane, γ-glycidoxypropyltriacetoxysilane, β- (3,4
-Epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane and the like.

Examples of tetrafunctional (a = 0) include methyl silicate, ethyl silicate, isopropyl silicate, n-propyl silicate, n-butyl silicate,
t-butyl silicate, sec-butyl silicate and the like. If necessary, a bifunctional silane compound can be used in combination. Examples of bifunctional are dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, methylphenyldimethoxysilane, methylvinyldimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane , Γ-glycidoxypropylphenyldimethoxysilane, γ-glycidoxypropylphenyldiethoxysilane, γ-chloropropylmethyldimethoxysilane, γ-chloropropylmethyldiethoxysilane, dimethyldiacetoxysilane, γ-methacryloxypropylmethyl Dimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylethyldiethoxysilane, γ-mercaptopropyl And methylmethyldiethoxysilane, aminomethylethyldimethoxysilane, N-β (aminomethyl) -γ-aminopropylethyldimethoxysilane, methylvinyldiethoxysilane, and the like.

These compounds may be used alone or in combination of two or more depending on the purpose.
The compound of the general formula (3) may be used as it is,
It is preferably used as a hydrolyzate for the purpose of increasing the reaction rate and lowering the curing temperature. Compounds with the same functionality are 2
When two or more compounds having different functional numbers are used in combination or two or more compounds having different functionalities are used, they may be used together after hydrolysis, or may be used together before hydrolysis to perform co-hydrolysis. The alcohol HOR ² is released by the hydrolysis, and the compound of the general formula (3) is converted to the corresponding silanol (S
iOH). Silanol undergoes dehydration condensation between a plurality of molecules to form a siloxane bond (—Si—O—). The dehydration condensation proceeds quickly, and oligomers are produced. After the hydrolysis, it may be left (cured) for 1 to 24 hours so that the dehydration condensation proceeds sufficiently. This oligomer is contained in the hydrolysis product.

In order to improve the properties of the hard coat layer or to increase the refractive index to a predetermined value, these resins may contain inorganic fine particles of 1 to 200 nm. The content is 5 to 80% by weight, preferably 10 to 70% by weight. It is preferable that the refractive index difference between the lens substrate and the hard coat layer is zero or 0.05 or less. If the thickness (thickness) of the layer is not uniform when the difference is large, there is a disadvantage that interference fringes are easily generated. When a layer is formed by the immersion method, the thickness (film thickness) of the layer tends to be non-uniform due to the influence of gravity. When the refractive index of the substrate is as low as 1.56 or less, the inorganic fine particles are preferably silicon dioxide which can be obtained at low cost. When the refractive index of the substrate is as high as 1.56 or more, the inorganic fine particles are preferably those exemplified above (for example, oxides of titanium) in order to increase the refractive index of the layer.

The hard coat layer is a solution of the resin (vehicle component) constituting the layer or, if it has a low molecular weight, itself is in a liquid state. Therefore, a coating solution is prepared in a solventless form, and a curing catalyst is appropriately added thereto. And apply by methods such as dipping, brush coating, spin coating, spray coating, and flow coating.
Dry at normal temperature or under heating (preferably 120 ° C. or lower). After drying, the resin may be further cured by heat treatment (preferably at 120 ° C. or lower).

As the curing catalyst, for example, the following can be used. (1) Amines: monoethanolamine, diethanolamine, isopropanolamine, ethylenediamine,
Isopropylamine, diisopropylamine, morpholine, triethanolamine, diaminopropane, aminoethylethanolamine, dicyandiamide, triethylene diamine, 2-ethyl-4-methylimidazole (2) General formula: metal represented by MX _n Y _3-n chelate Compound: wherein X is OL (L is a lower alkyl group), Y is a ligand derived from the general formula A ¹ COCH ₂ COA ² (A ¹ and A ² are lower alkyl groups) or A ¹ COCH ₂ COOA ² And n is 0 or 1 or 2.

Particularly useful chelate compounds are as follows from the viewpoint of solubility, stability and catalytic effect. Aluminum acetylacetonate, aluminum bisethylacetoacetate monoacetylacetonate, aluminum-di-n-butoxide-monoethylacetoacetate, aluminum-di-iso-propoxide monomethylacetoacetate, chromium acetylacetonate, titanyl acetylacetonate, Cobalt acetylacetonate, iron (III) acetylacetonate, manganese acetylacetonate, nickel acetylacetonate (3) Metal alkoxide: aluminum triethoxide, aluminum tri-n-propoxide, aluminum tri-n-butoxide, tetraethoxytitanium, Tetra n-
Butoxy titanium, tetra i-propoxy titanium.

(4) Organic metal salts: sodium acetate, zinc naphthenate, cobalt naphthenate, zinc octylate, tin octylate (5) Perchlorates: magnesium perchlorate, ammonium perchlorate (6) Organic acids Or anhydrides thereof: malonic acid, succinic acid, tartaric acid, adipic acid, azelaic acid, maleic acid, O-phthalic acid, terephthalic acid, fumaric acid, itaconic acid, oxaloacetic acid, succinic anhydride, maleic anhydride, itaconic anhydride , 1,2-dimethylmaleic anhydride, phthalic anhydride,
Hexahydrophthalic anhydride, naphthalic anhydride (7) Lewis acid: ferric chloride, aluminum chloride (8) Metal halide: stannous chloride, stannic chloride,
Tin bromide, zinc chloride, zinc bromide, titanium tetrachloride, titanium bromide, thallium bromide, germanium chloride, hafnium chloride, lead chloride, lead bromide You may use it. In particular, when epoxysilane is used, it is preferable to use one that also functions as a ring-opening polymerization catalyst for the epoxy group.

A solvent is added as necessary to make the coating liquid liquid or to lower the viscosity. For example,
Water, lower alcohols, acetone, ethers, ketones, esters and the like are used. The coating liquid generally contains 10 to 4 inorganic fine particles per 100 parts by weight of resin (solid content).
0.0050 parts by weight, preferably 50 to 250 parts by weight, and the curing catalyst is 0.0
0001 to 20 parts by weight.

In addition to the above components, various additives may be used as needed, for example, for the purpose of improving adhesion, improving weather resistance, or improving the stability of the coating solution. Examples of additives include pH adjusters, viscosity improvers, leveling agents, matting agents, dyes, pigments, stabilizers,
There are ultraviolet absorbers, antioxidants and the like.

In addition, an epoxy resin or another organic polymer such as a polyol, a cellulose resin or a melamine resin may be added for the purpose of improving the dyeability of the hard coat layer. Various surfactants can be used in combination with the coating solution for the purpose of improving the flow at the time of application, improving the smoothness of the hard coat layer and lowering the friction coefficient of the surface of the hard coat layer. A block or graft copolymer of siloxane and alkylene oxide, and a fluorine-based surfactant are effective.

The thickness of the hard coat layer is suitably 0.01 μm to 50 μm, preferably 0.5 μm to 2 μm, depending on the purpose. Recently, a technique for forming a hard coat layer by a dry method has been proposed. According to this, a gas of methyltriethoxysilane or dimethoxydimethylsilane and an oxygen gas are introduced into a vacuum chamber to form a hard coat layer by a CVD method. This method may be used. (4) Antireflection film: The reflectance of the lens is usually 4
%, But in order to suppress this, especially in the case of spectacle lenses, an antireflection film is often provided for the purpose of preventing the presence of the lens from being seen by others and improving the aesthetics of the wearer. . In the case of the present invention, the content is preferably 1% or less.

The theory of the antireflection film is that, in the case of a single layer, when the refractive index of the substrate is n, the refractive index is as low as or close to the square root of n, and the thickness is the wavelength of light λ. It is said that reflection is suppressed when a quarter of the optical thin film is provided. However, in the case of a single layer, antireflection is performed for one wavelength λ, but to prevent reflection over a wide range of visible light, it is necessary to rely on a multilayer antireflection theory. Since the multilayer antireflection theory is difficult, it is omitted here. The antireflection film based on the multilayer antireflection theory basically consists of alternating layers of a low-refractive-index optical thin film and a high-refractive-index optical thin film.

Examples of the material for providing an optical thin film having a low refractive index include magnesium fluoride, silicon monoxide, and silicon dioxide. Examples of the material for providing an optical thin film having a high refractive index include aluminum oxide, zirconium oxide, antimony oxide, and titanium oxide. Tantalum oxide, tin oxide, tungsten oxide, iron oxide, cerium oxide, and the like are used. Such an optical thin film has a thickness of ８, １, １ of the wavelength λ.
Since it is as thin as possible, the forming method is a vacuum thin film forming technique such as vacuum deposition, ion plating, and sputtering. Any method may involve a reaction in a vacuum chamber.

The present invention is effective for an antireflection film having a hydrophilic surface, that is, an antireflection film having a silicon oxide-based inorganic material layer at least on the uppermost layer. (5) Water-repellent layer: In the present invention, the following [I] and [I
A water repellent consisting of [I] or [III] is used. [I] a composition comprising an organopolysiloxane having neither a hydroxyl group nor a hydrolyzable group and an acid catalyst; [II] a monofunctional organosilane compound having a fluorinated organic group; [III] a general formula [Rf A silazane compound represented by R ₂ Si] ₂ NH; wherein R f is a fluorinated organic group, R is a monovalent hydrocarbon group, and two Rs may be the same or different Regarding [I]: Silicone oil is preferable as the organopolysiloxane having neither a hydroxyl group nor a hydrolyzable group. A typical example of the silicone oil is represented by the general formula (2):

[0034]

Embedded image

## EQU1 ## In the formula, R ³ and R ⁴ are each a hydrocarbon group bonded to a Si atom, generally an alkyl group or an aryl group, and have about 1 to 9 carbon atoms. The hydrocarbon group may be substituted with fluorine or the like. Two R
³ and two R ^{4 s} may be the same or different. A methyl silicone oil in which R ³ and R ⁴ are both methyl groups and both terminals are methyl groups (a kind of alkyl group) is easily available. n is an integer of 3 to 100, particularly 3 to
50 is preferably used in the present invention.

Examples of the acid catalyst include sulfuric acid, hydrochloric acid, nitric acid, acetic acid, volatile sulfonic acids (eg, benzenesulfonic acid, toluenesulfonic acid), fluorosulfonic acid, chlorosulfonic acid, sulfamic acid, citric acid, and benzoic acid. And oxalic acid. The addition amount of the acid catalyst is 0.001 to 100 parts by weight of the organopolysiloxane.
30 parts by weight, especially 0.01 to 10 parts by weight, is suitable.

By adding an acid catalyst to the organopolysiloxane, the composition (one of the water repellents of the present invention [I])
Is prepared. In the composition, the organopolysiloxane is decomposed, but some molecules are recombined, resulting in an equilibrium reaction between decomposition and recombination. However, when decomposed, active sites schematically represented by “Si—O.” Or “Si—OH” are generated. This active site is in a high energy state and easily reacts. Therefore, the active point is determined on the surface of the lens (when a shock absorbing layer, a hard coat layer, or an antireflection film is formed on a substrate, the surface thereof, particularly SiO or SiO 2).
_{The two} surfaces are preferably reacted with reactive groups (eg, silanol groups) or active sites to bind to the lens surface. Since this reaction becomes more active as the temperature increases, it is preferable to heat the reaction to 60 ° C. or higher. However, if the lens substrate is plastic, it is not desirable if the temperature exceeds 120 ° C., since the lens may be deformed.

Regarding [II]: A monofunctional organic silane compound having a fluorinated organic group is the water repellent of [II]. The compounds have the general ^{formula: Rf · R 11 · R 12} SiX
Or represented by Rf · Rf · R ¹¹ SiX. In the formula, Rf is a fluorinated organic group (a hydrocarbon group such as an alkyl group)
And a carbon number of 1 to 30 is appropriate. Fluorination may be in the form of replacing all or some of the hydrogens in the organic group. Preferred "fluorinated organic groups" are perfluoroalkyl groups (e.g.
20) substituted hydrocarbons (for example, having 2 to 10 carbon atoms)
Alkyl groups such as methyl, ethyl, propyl, butyl, hexyl, cyclohexyl, alkenyl groups such as vinyl, allyl, propenyl, butenyl, aryl groups such as phenyl, xylyl, aralkyl groups such as benzyl). This hydrocarbon group may be substituted by halogen such as chlorine and fluorine. R ¹¹ and R ¹² are R
³ or R ⁴ , substituted or unsubstituted, having 1 to 1 carbon atoms
0 is a monovalent hydrocarbon group (preferably an alkyl group).

X is an OH group or a "functional group which reacts with ambient moisture to form a silanol group", and includes, for example, a halogen atom, an alkoxy group having 1 to 10 carbon atoms, an alkenyloxy group, an acyloxy group and the like. Is preferred. Specific examples of the silane compound [II] are as follows. _{CF 3 C 2 H 4 (CH} 3) 2 SiOH C 4 F 9 C 2 H 4 (CH 3) 2 SiOH C 8 F 17 C 2 H 4 (CH 3) 2 SiOH C 8 F 17 C 3 H 6 (CH ₃ ) ₂ SiOH CF ₃ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiOHC ₄ F ₉ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiOH C ₈ F ₁₇ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiOH CF ₃ C ₂ H ₄ · CH ₃ · C ₂ H ₅ · SiOH C ₄ F ₉ C ₂ H ₄ · CH ₃ · C ₂ H ₅ · SiOH C ₈ F ₁₇ C ₂ H ₄ · CH ₃ · C ₂ H ₅ · SiOH C ₈ F ₁₇ C ₃ H ₆ · CH ₃ · C ₂ H ₅ · SiOH CF ₃ C ₂ H ₄ (CH ₃ ) ₂ SiCl C ₄ F ₉ C ₂ H ₄ (CH ₃ ) ₂ SiCl C ₈ F ₁₇ C ₂ H ₄ (CH ₃ ) ₂ SiCl C ₈ F ₁₇ C ₃ H ₆ (CH ₃ ) ₂ SiCl CF ₃ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiCl C ₄ F ₉ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiCl C ₈ F ₁₇ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiCl CF ₃ C ₂ H ₄ .CH ₃ .C ₂ H ₅ .SiCl C ₄ F ₉ C ₂ H ₄ .CH ₃ .C ₂ H ₅ .SiCl C ₈ F ₁₇ C ₂ H _{4 · CH 3 · C 2 H} 5 · SiCl C 8 F 17 C 3 H 6 · CH 3 · C 2 H 5 · SiCl CF 3 C 2 H 4 (CH 3) 2 SiOCH 3 C 4 F 9 C 2 H 4 (CH ₃ ) ₂ SiOCH ₃ C ₈ F ₁₇ C ₂ H ₄ (CH ₃ ) ₂ SiOCH ₃ C ₈ F ₁₇ C ₃ H ₆ (CH ₃ ) ₂ SiOCH ₃ CF ₃ C ₂ H ₄ (C ₂ H ₅ ) _{2 SiOCH 3 C 4 F 9 C 2} H 4 (C 2 H 5) 2 SiOCH 3 C 8 F 17 C 2 H 4 (C 2 H 5) 2 SiOCH 3 CF 3 C 2 H 4 · CH 3 · C 2 H 5 _{· SiOCH 3 C 4 F 9 C} 2 H 4 · CH 3 · C 2 H 5 · SiOCH 3 C 8 F 17 C 2 H 4 · CH 3 · C 2 H 5 · SiOCH 3 C 8 F 17 C 3 H 6 · CH ₃ · C ₂ H ₅ · SiOCH ₃ CF _{3 C 2 H 4 (CH 3} ) 2 SiOC 2 H 5 C 4 F 9 C 2 H 4 (CH 3) 2 SiOC 2 H 5 C 8 F 17 C 2 H 4 (CH 3) 2 SiOC 2 H 5 C 8 _{F 17 C 3 H 6 (CH} 3) 2 SiOC 2 H 5 CF 3 C 2 H 4 (C 2 H 5) 2 SiOC 2 H 5 C 4 F 9 C 2 H 4 (C 2 H 5) 2 SiOC 2 H _{5 C 8 F 17 C 2 H} 4 (C 2 H 5) 2 SiOC 2 H 5 CF 3 C 2 H 4 · CH 3 · C 2 H 5 · SiOC 2 H 5 C 4 F 9 C 2 H 4 · CH 3 · C ₂ H ₅ · SiOC ₂ H ₅ C ₈ F ₁₇ C ₂ H ₄ · CH ₃ · C ₂ H ₅ · SiOC ₂ H ₅ C ₈ F ₁₇ C ₃ H ₆ · CH ₃ · C ₂ H ₅ · SiOC _{2 H 5 CF 3 C 2 H 4} (CH 3) 2 SiOC (CH 3) = CH
₂ C ₄ F ₉ C ₂ H ₄ (CH ₃ ) ₂ SiOC (CH ₃ ) = C
_{H 2 C 8 F 17 C 2} H 4 (CH 3) 2 SiOC (CH 3) = C
_{H 2 C 8 F 17 C 3} H 6 (CH 3) 2 SiOC (CH 3) = C
H ₂ CF ₃ C ₂ H ₄ (C ₂ H ₅ ) ₂ SiOC (CH ₃ ) = C
_{H 2 C 4 F 9 C 2} H 4 (C 2 H 5) 2 SiOC (CH 3) =
_{CH 2 C 8 F 17 C 2} H 4 (C 2 H 5) 2 SiOC (CH 3) =
CH ₂ CF ₃ C ₂ H ₄ .CH ₃ .C ₂ H ₅ .SiOC (C
H ₃ ) = CH ₂ C ₄ F ₉ C ₂ H ₄ .CH ₃ .C ₂ H ₅ .SiOC (CH
_{3) = CH 2 C 8 F} 17 C 2 H 4 · CH 3 · C 2 H 5 · SiOC (CH
_{3) = CH 2 C 8 F} 17 C 3 H 6 · CH 3 · C 2 H 5 · SiOC (CH
₃ ) = CH ₂ [III]: The silazane compound represented by the general formula [Rf R ₂ SiN] ₂ H is the water repellent of [III]. Particularly, the disilazane compound represented by the general formula (1) is preferable.

Specific examples of the silazane compound [III] are as follows. _{[C 4 F 9 C 2 H 4} (CH 3) 2 Si ] ₂ NH _{[C 4 F 9 C 3 H 6} (CH 3) 2 Si ] ₂ NH _{[C 8 F 17 C 2 H 4} (CH 3) 2 Si] ₂ NH _{[C 8 F 17 C 3 H 6} (CH 3) 2 Si ] ₂ NH _{[C 8 F 17 C 3 H 6} (CH 3) (C 2 H 5) Si ] ₂ N
H _{[C 10 F 21 C 3 H 6} (CH 3) 2 Si ] ₂ NH These compounds are used alone or as a mixture. Also,
The water repellent [I], [II] or [III] may be used as a mixture. Water repellent [I], [II] or [II
I] or a mixture thereof, the water-repellent treatment of a lens substrate (in the case where an impact absorbing layer, a hard coat layer, or an antireflection film is formed on the substrate, the substrate having the same). It is roughly divided into two cases: a case by the coating method, a case by the vacuum evaporation method, the CVD method and other vacuum thin film forming techniques.
There is a street.

In the coating method, when the water repellent is a liquid, it may be applied as it is.
In the case of I) and [III], it is suitable to use a solution diluted to 0.1 to 20% by weight, preferably 1 to 6% by weight with a solvent. Solvents are anhydrous non-aqueous organic solvents, for example, hydrocarbon solvents such as benzene, toluene, xylene, hexane, and pentane; ketone solvents such as acetone and methyl ethyl ketone; ester solvents such as ethyl acetate and butyl acetate; and silicone solvents. Solvent, preferably a fluorinated solvent (eg, meta-xylene hexafluoride, 1,1,2
-Trichloro-1,2,2-trifluoroethane and other fluorocarbons) are used.

As a coating method, a dipping method, brush coating, spin coating, spray coating, flow coating, or the like is used. After coating, it is preferable to immerse the object to be coated (lens intermediate) in a solvent to remove the excess water repellent. Then, it is dried for 1 minute to 1 day at room temperature or under heating (preferably 120 ° C. or less). Thus, a water-repellent layer is formed. In the case of the present invention, the degree of water repellency is evaluated as acceptable if the contact angle (static contact angle) is 80 ° or more, preferably 90 ° or more. In any case, it is preferable that the molecules of the water-repellent agent be decomposed during the water-repellent treatment to have active points and bond with the active points on the surface of the antireflection film.

When the water repellents of [II] and [III] are used, the fluorinated organic group is applied to the surface of the lens substrate (the shock absorbing layer, the hard coat layer, and the antireflection film are formed on the substrate). If it is formed, it is preferable that the water-repellent layer be formed standing vertically to the surface). Therefore, the hydrophilic surface is not exposed to the outside.
Further, when a water-repellent layer is provided on the antireflection film, the theory of antireflection is broken, so that the water-repellent layer is preferably a monomolecular film.

[0044]

In the following description, "parts" means parts by weight. (1) Preparation of lens substrates: Three commercially available lens substrates (concave lens / diameter: 80 mm) shown below were prepared.・ Substrate Sl: Refractive index 1.50 (material is a polymer of CR-39) ・ Substrate Sh: Refractive index 1.67 (material is a copolymer of brominated bisphenol A and urethane-modified dimethacrylate) Substrate Shh: refractive index 1.70 (material is quarter phenyl-aromatic polyethersulfone copolymer) (2) Formation of impact absorbing layer: <Preparation of coating liquid P1 (for low refractive index)> Commercially available aqueous solution 100 parts of polyurethane "Superflex 150" in emulsion form (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., solid content 30% by weight, non-yellowing type, ether / ester type), 200 parts of pure water,
SiO ₂ sol (solid content 30% by weight, average particle size 13n)
m) To 30 parts by weight, a solution prepared by hydrolyzing 10 parts of methyltrimethoxysilane with 8 parts of pure water is added and mixed. <Preparation of coating solution Ph (for high refractive index)> Commercially available polyurethane in the form of an aqueous emulsion "Superflex 100" (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., solid content 30% by weight, non-yellowing type, ether / ester type) 100 Parts, 200 parts of pure water,
TiO ₂ sol (solid content 30% by weight, average particle size 30n)
m) To 40 parts, a solution prepared by hydrolyzing 8 parts of γ-glycidoxypropyltrimethoxysilane with 5 parts of pure water is added and mixed. <Preparation of coating liquid Phh (for ultra-high refractive index)> Commercially available polyurethane in the form of aqueous emulsion "Superflex 100" (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., solid content 30% by weight, non-yellowing type, ether / ester type) 100 parts, pure water 200 parts,
TiO ₂ sol (solid content 30% by weight, average particle size 30n)
m) To 60 parts, a solution prepared by hydrolyzing 8 parts of γ-glycidoxypropyltrimethoxysilane with 5 parts of pure water is added and mixed. <Coating> A spin-coating method (rotation speed: 1000 rpm, 5 seconds) is applied to the lens substrate which has been subjected to the plasma treatment as a pre-treatment, and then heated at 80 ° C. for 30 minutes to cure the coating layer. A shock absorbing layer having a thickness of 1.2 μm is formed on a substrate. The refractive index of the layer is 1.49 when the coating liquid is Pl, 1.67 when it is Ph, and 1.70 when it is Phh. (3) Formation of Hard Coat Layer: <Preparation of Preliminary Composition A> γ was placed in a reaction vessel equipped with a rotor.
Glycidoxy propyl methyldiethoxysilane 248
Of the mixture, and with vigorous stirring using a magnetic stirrer, add 36 parts of a 0.05 N hydrochloric acid aqueous solution at a time, and stir for 1 hour to obtain a hydrolyzate.

The obtained hydrolyzate was mixed with ethanol 56.
After addition of 6 parts and 53.4 parts of ethylene glycol,
Preliminary composition A is prepared by adding 4.7 parts of aluminum acetyl acetate and thoroughly mixing and dissolving. <Preparation of Preliminary Composition B> In a reaction vessel equipped with a rotor,
γ-glycidoxypropyltrimethoxysilane 212.
4 parts are added, and 48.6 parts of a 0.01 N hydrochloric acid aqueous solution is gradually added dropwise while maintaining the temperature in the container at 10 ° C. and stirring vigorously using a magnetic stirrer. Immediately after the completion of the dropping, the cooling is stopped to obtain a liquid hydrolyzate.

Ethanol 77.1 was added to the obtained hydrolyzate.
Parts and 37.7 parts of ethylene glycol, and 7.65 parts of aluminum acetyl acetate are added and mixed well to prepare Preparatory Composition B. <Preparation of coating liquid Hl (for low refractive index)>
20 parts of the preliminary composition A, 80 parts of the preliminary composition B,
iO ₂ sol (solid content 30% by weight, average particle size 13nm)
200 parts and 0.45 part of a silicone-based surfactant are sufficiently stirred and mixed to prepare a coating solution Hl. <Preparation of coating liquid Hh (for high refractive index)>
100 parts of the preliminary composition B was added to a TiO ₂ sol (solid content 3).
(0% by weight, average particle size 30 nm) 220 parts and a silicone-based surfactant 0.55 parts are sufficiently stirred and mixed to prepare a coating liquid Hh. <Preparation of coating solution Hhh (for ultra-high refractive index)> In a glass container, 100 parts of the preliminary composition B, 300 parts of a TiO ₂ sol (solid content 30% by weight, average particle diameter 30 nm), a silicone-based interface 0.55 parts of the activator is sufficiently stirred and mixed to prepare a coating solution Hhh. <Coating> For the purpose of improving adhesion, the object to be coated (lens intermediate) is immersed in a 10% NaOH aqueous solution at 60 ° C. for 3 minutes, then washed with water and dried.

After the dried object to be coated is vertically immersed in the coating solution, it is pulled up at a pulling rate of 90 mm / min. The coated object is heated at 100 ° C. for 4 hours to harden the coating liquid. As a result, a hard coat layer having a thickness of 2.2 μm is formed. The refractive index of the layer is 1.50 when the coating liquid is H1.
In the case of Hh, it is 1.67, and in the case of Hhh, it is 1.70. (4) Formation of antireflection film: A multilayer antireflection film was formed on both surfaces of the lens intermediate by a vacuum evaporation method. The structure of the antireflection layer is as follows. <Al (5 layers structure for low refractive index substrate Sl)> (reflectance 1.5%) Air side / SiO ₂ 850Å / ZrO ₂ 600Å / SiO ₂ 200Å / ZrO ₂ 300Å / SiO ₂ 200Å / substrate side <Ah (high refractive index substrate Sh for-five-layer structure)> (1.5% reflectance) air side _{/ SiO 2 850Å / TiO 2 1100Å} / SiO 2 350Å / / TiO 2 150Å / SiO 2 250Å / substrate Side <Ahh (for ultra-high refractive index substrate Shh, 5-layer structure)> (reflectance: 1.5%) Same as for high refractive index substrate Sh. (5) Formation of Water Repellent Layer: <Formation of Water Repellent Layer (Coating Method)> First, the following four kinds of water repellents are prepared and diluted to 5% by weight with the following solvent.

[Ia]: methyl silicone oil (n =
10, viscosity 10) 100 parts and sulfuric acid 1.0 as acid catalyst
Composition comprising Part (solvent: ethyl alcohol) _{[IIa]: C 8 F 17 C 3 H} 6 (CH 3) 2 SiCl ( solvent: toluene) _{[IIb]: C 4 F 9 C 2 H} 4 (CH 3) ₂ SiOC
(CH ₃ ) = CH ₂ (solvent: acetone) [IIIa]: [C ₈ F ₁₇ C ₂ H ₄ (CH ₃ ) ₂ Si]
₂ NH (solvent: meta-xylene hexafluoride) [IIIb]: [C ₈ F ₁₇ C ₃ H ₆ (CH ₃ ) ₂ Si]
₂ NH (solvent: meta-xylene hexafluoride) [X1]: C ₈ F ₁₇ C ₂ H ₄ Si (NH) _1.5 (prior art) (solvent: meta-xylene hexafluoride) Next, the object to be coated (lens intermediate) ) Is vertically immersed in the water repellent, and pulled up at a pulling rate of 1 mm / sec. The pulled-up object is dried at 60 ° C. for 20 minutes. Since the stickiness still remains, the substrate is washed with meta-xylene hexafluoride. Thus, a water-repellent layer is formed, and the lens (sample) of the present invention is completed. For comparison, a comparative lens (sample) without a water-repellent layer is also prepared. <Formation of Water Repellent Layer (Evaporation Method)> First, the following three kinds of water repellents were prepared.

[Ia ₂ ]: methyl silicone oil (n =
10, viscosity 10) 100 parts and sulfuric acid 1.0 as acid catalyst
Composition comprising Part [IIa _{2]: C 8 F 17 C 3 H} 6 (CH 3) 2 SiCl [IIIa _{2]: [C 8 F 17 C 2 H 4} (CH 3) 2 Si ]
₂ NH [IIIb ₂ ]: [C ₈ F ₁₇ C ₃ H ₆ (CH ₃ ) ₂ Si]
₂ NH Next, the water repellent was poured into a metal dish filled with copper wire wool, and the dish was set in a chamber of a vacuum evaporation apparatus. On the other hand, the object to be coated (lens intermediate) was set on a substrate holder in the chamber. Once inside the chamber
After evacuating to a vacuum of × 10 ^-5 Pa, the plate is
A water repellent layer is formed by heating to 0 ° C. and vapor deposition for 90 seconds. Thereby, the lens (sample) of the present invention is completed. For comparison, a comparative lens (sample) without a water-repellent layer is also prepared. (6) Test: Measurement of static contact angle: Measured using a contact angle meter CZ-X150 manufactured by Kyowa Interface Science Co., Ltd.

Presence / absence of water scorch: The sample was cut by a commercially available ball-sliding machine according to a predetermined lens shape. After leaving for 2-3 hours, the surface was wiped clean with a cloth dampened with methanol. Thereafter, it is determined whether or not the water mark appears by blowing a breath. If you can't see it, pass "None".
"Yes" and "Fail".

Presence / absence of pad marks: During the rubbing operation, the lens was pressed with a rubber pad having a diameter approximately half that of the sample.
Do the work. Blow the sample and determine if the traces of the depression appear as white circles. If it is not visible, it passes "No", and if it is visible, it is "Fail" with "Yes". The lens of the present invention shows no pad marks and has high commercial value.

Adhesion of dust: Leave it indoors for 30 days, observe the dust on the surface, and evaluate according to the following criteria. A: Almost no dust adhered. B: Slight dust adhered. C: A large amount of dust is attached. Tables 1 to 4 show the above test results.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

[Table 3]

[0056]

[Table 4]

[0057]

As described above, according to the present invention, since the water repellent has no functional group or is monofunctional, the pot life of the water repellent is long. In the present invention, since the water repellent is not cured on the lens surface, no shrinkage distortion is caused by the curing. Therefore, the lens of the present invention is particularly suitable for an aspheric lens whose surface precision is delicate.

The lens of the present invention has a high commercial value because even when the lens is blown on, the pad marks during the ball-sliding operation do not come out white. In addition, the lens of the present invention
There is no dust, the appearance is beautiful, and there is a sense of quality. Therefore, the lens of the present invention is suitable for a lens for two-point glasses.

However, since it is not a cured product (prior art), there is no “effect that is less likely to be damaged compared to the case where no water-repellent layer is provided”.

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G02B 3/00 G02B 3/02 3/02 G02C 7/06 G02C 7/06 C09D 5/00 PPG / / C09D 5/00 PPG 183/04 PMV 183/04 PMV G02B 1/10 A (72) Inventor Mitsuo Asai 1-10 Hitomi, Matsuida-cho, Usui-gun, Gunma Prefecture Shin-Etsu Chemical Co., Ltd. 72) Inventor Jin Uehara 1-10 Hitomi, Matsuida-cho, Usui-gun, Gunma Prefecture, Japan Silicone Electronic Materials Technology Laboratory, Shin-Etsu Chemical Co., Ltd.

Claims (22)

[Claims] 1. A water-repellent layer made of an uncured substance and having a contact angle of 80 ° or more is formed by treating a lens substrate with a water-repellent comprising the following [I], [II] or [III]. A lens characterized by the following. [I] a composition comprising an organopolysiloxane having neither a hydroxyl group nor a hydrolyzable group and an acid catalyst; [II] a monofunctional organosilane compound having a fluorinated organic group; [III] a general formula [Rf A silazane compound represented by R ₂ Si] ₂ NH; wherein R f is a fluorinated organic group, R is a monovalent hydrocarbon group, and two Rs may be the same or different ) 2. The compound of [III] is represented by the general formula (1): The lens according to claim 1, wherein the lens is a silazane compound represented by the following formula: wherein n is an integer of 4 or more, and m is 2 or 3. 3. The lens according to claim 2, wherein the silazane compound is [C ₈ F ₁₇ C ₃ H ₆ (CH ₃ ) ₂ Si] ₂ NH. 4. The lens according to claim 1, further comprising an anti-reflection film between said lens substrate and said water-repellent layer. 5. The lens according to claim 4, wherein the antireflection film has a silicon oxide-based inorganic material layer at least as an uppermost layer. 6. The lens according to claim 1, further comprising a hard coat layer between the lens substrate and the water repellent layer or the antireflection film. 7. The lens according to claim 6, further comprising a shock absorbing layer between the lens substrate and the hard coat layer. 8. The lens according to claim 6, wherein a difference in refractive index between the lens substrate and the hard coat layer is zero or 0.05 or less. 9. The lens according to claim 7, wherein a difference in refractive index between the lens substrate and the shock absorbing layer is zero or 0.05 or less. 10. The method according to claim 6, wherein the hard coat layer is made of a cured product of at least one kind of an organic silane compound represented by the following general formula (3) and / or a partially hydrolyzed product thereof. A lens according to any of the above. R ¹ _a Si (OR ² ) _4-a (3) (wherein, R ¹ is an alkyl group, an alkenyl group, an aryl group or a halogen, an amino group, a mercapto group, a (meth) acryloxy group, a cyano group, glycidyl group, a glycidoxy group, a hydrocarbon group substituted with a mercapto group or an epoxy group, is bonded to Si by a carbon atom, R ²
Is an alkyl group having 1 to 8 carbon atoms, an allylalkyl group, an alkoxyalkyl group, an alkenyl group, an aryl group or an acyl group, and a is 0 or 1. ) 11. The lens according to claim 10, wherein the silane compound has a glycidyl group, a glycidoxy group or an epoxy group. 12. The hard coat layer has a thickness of 1 to 200 nm.
The lens according to claim 10, further comprising inorganic fine particles. 13. The lens according to claim 7, wherein the shock absorbing layer contains inorganic fine particles of 1 to 200 nm. 14. The lens according to claim 12, wherein when the refractive index of the lens substrate is as low as 1.56 or less, the inorganic fine particles are silicon oxide. 15. When the refractive index of the lens substrate is as high as 1.56 or more, the inorganic fine particles may contain zinc, aluminum, antimony, yttrium, ytterbium, iridium, indium, erbium, osmium, cadmium, gadolinium, Gallium, gold, silver, chromium, germanium, cobalt, samarium, dysprosium,
Zirconium, mercury, scandium, tin, strontium, cesium, cerium, thallium, tungsten, tantalum, titanium, thulium, technetium, iron, terbium, tellurium, copper, thorium, lead, niobium, nickel,
It is a metal selected from neodymium, platinum, vanadium, hafnium, palladium, barium, bismuth, molybdenum or lanthanum, an alloy of the metal, a compound of the metal, an oxide, an chloride or an amphoteric compound. The lens according to claim 10 or 11, wherein 16. The lens according to claim 1, wherein the water-repellent layer is formed partially as viewed from above. 17. The lens according to claim 1, wherein said lens base is made of plastic. 18. The lens according to claim 1, wherein the lens substrate has a refractive index of 1.6 or more. 19. The lens according to claim 18, wherein the lens substrate has a refractive index of 1.7 or more. 20. The lens according to claim 1, wherein the reflectance of the antireflection film is 2% or less. 21. The lens according to claim 1, wherein the lens substrate is an aspherical lens. 22. The lens according to claim 1, wherein the lens is for two-point glasses.