JP2002240186A - Method for imparting anti-fogging performance, and optical article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart anti-fogging effect excellent in durability to an optical article such as a spectacle lens, window glass or the like without damaging optical characteristics such as reflection preventing properties or the like. SOLUTION: The surface of an oxide is treated with organosilane and a surfactant successively or simultaneously to impart anti-fogging effect excellent in durability to the optical article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lenses such as glasses and cameras having anti-fog performance, or optical articles such as window glasses, car windshields, helmet shields, underwater glasses, and mirrors used in bathrooms. Etc. relating to the oxide surface.

[0002]

2. Description of the Related Art The phenomenon that the surface of an article is fogged occurs because minute water droplets adhere to the surface and form dew, and the minute water droplets irregularly reflect light. This fogging causes a remarkable decrease in the performance of optical components such as spectacle lenses and optical lenses, and is a major problem in terms of safety as window glass for vehicles such as automobiles.

[0003] In order to impart antifogging performance to an article, 1) the base material is made to absorb water, 2) the base material surface is made hydrophilic,
3) The surface of the base material is made hydrophobic. 4) The surface temperature of the optical article is increased so that moisture in the air does not condense on the surface.
The above four methods have been proposed in the past, and various attempts have been made. Regarding the method of 1) for imparting water absorbency to a substrate, a water absorbing material is mixed with a coating composition or a synthetic resin substrate itself, or a hydrophilic and water absorbent monomer is copolymerized to absorb water. Is provided. This is disclosed in Japanese Patent Application Laid-Open No. 10-311902, Japanese Patent Application Laid-Open No. 05-156202, and the like. As a method of imparting water absorbency to an inorganic substance such as glass having poor water absorbency, a method of imparting water absorbency by making the inorganic substance porous is disclosed in JP-A-10-114543.
And so on.

[0004] As the method 2) for making the surface of the substrate hydrophilic, the simplest method is to apply a surfactant to the surface to make the surface of the substrate hydrophilic and prevent fogging. Also, in order to expect continuous effects, as described above, a surfactant is mixed with the synthetic resin base material itself, or a hydrophilic, water-absorbing monomer is copolymerized to form the synthetic resin base material. There is a method of imparting anti-fogging performance by using. For this,
JP-A-10-114035, JP-A-10-13051
1, JP-A-10-158453, JP-A-10-1829
12, and JP-A-10-202798. A method of applying a coating having anti-fog performance to the surface of an optical resin article is also well known.
6, JP-A-8-27291, JP-A-9-136374,
It is disclosed in JP-A-9-151368 and JP-A-9-155282.

A method for forming a photocatalytic metal oxide film and exhibiting superhydrophilicity is disclosed in JP-A-2000-3090.
68, JP-A-2000-86933, JP-A-9-7753
5, JP-A-10-68091, JP-A-10-8510
0, JP-A-10-167727, JP-A-10-2979
40 and the like.

[0006] Graft polymerization as a method of surface modification includes:
This is a method in which a hydrophilic group is monomolecularly introduced into the substrate surface, and is a very effective means on an oxide film having antireflection properties. JP-A-5-202216, JP-A-5-29513
9, JP-A-8-176328, JP-A-9-30174
2. It is disclosed in JP-A-10-90503 and the like. Other surface modification methods include JP-A-10-114543 and JP-A-10-167768.

Further, Japanese Patent Application Laid-Open Nos. 9-202651 and 9-29583 are disclosed as patents combining pores / concavities and convexities of an inorganic substance and a hydrophilic substance and patents utilizing surface irregularities.
5, JP-A-11-77876.

[0008] 3) is a method in which the contact angle on the surface of the base material is increased so that water droplets fall off by its own weight. This is disclosed in JP-A-2000-103007, JP-A-10-26703,
It is disclosed in JP-A-10-45429 and JP-A-11-320743.

4) The surface temperature of the optical article is increased so that moisture in the air does not condense on the surface. For information on how,
It is disclosed in JP-A-7-241932 and JP-A-2000-86299.

[0010]

However, the conventional methods have various disadvantages. In particular, in the case of an optical article having antireflection characteristics, it is difficult to provide the outermost surface with antifogging characteristics without changing the antireflection characteristics.

In the method of (1) for imparting water absorbency to the base material, sufficient performance is obtained as antifogging performance, but when water is absorbed, it becomes very soft and easily scratched. . In addition, if the number of cross-linking points is increased to improve this, it is said that the water absorption decreases. In addition, there is a disadvantage that when the water absorption exceeds the saturated water absorption, clouding occurs. Further, there is a drawback that dirt in the air, for example, cigarette smoke is easily adsorbed, and the optical article is colored. Further, in the case of such a water-absorbing film, it is necessary to have a certain thickness, and it is impossible to formulate the film on a substrate having antireflection properties.

The method of imparting water absorbency by making an inorganic substance porous has a limited thickness, so that the amount of water absorbed is small.
By making it porous, the surface becomes brittle, and there is a problem in scratch resistance.

Regarding the method of 2) for making the surface of the substrate hydrophilic, most kinds of surfactants flow down due to adhesion of water and the like, and a continuous effect cannot be expected. It takes time and effort. However, it is a very effective means for imparting anti-fogging property to a film having anti-reflection properties in that the anti-reflection properties are not hindered.

With respect to the method of forming a photocatalytic metal oxide film and developing superhydrophilicity, it is difficult to develop superhydrophilicity unless it is exposed to ultraviolet rays due to its mechanism. In the case of extremely small water droplets like the above, since they do not have a sufficient size for the crystal structure of the photocatalytic substance,
Spread of water droplets is not enough, and cloudiness is recognized. Further, in particular, with respect to an optical material having antireflection properties, the reflection is rather increased due to the presence of a photocatalytic linear substance having a generally high refractive index on the outermost surface.

[0015] Various methods have been proposed for graft polymerization, in which a hydrophilic or hydrophobic thin film is formed on the outermost surface. According to the prior art, the reaction is complicated, and the antifogging component does not react densely on the surface of the substrate, so that sufficient antifogging property cannot be obtained.

In the method of 3), in which the contact angle of the surface of the base material is increased to cause the water drops to fall off by its own weight, the water drops fall only after the water drops have a certain size. Therefore, in the case of extremely minute water droplets such as cloudy, the water droplets do not fall naturally because of their insufficient weight.

In the method 4), the heater section and the energy source are indispensable, and the apparatus becomes too complicated.

Accordingly, the present invention has been made to solve the above problems and to provide an optical article having excellent antifogging performance on an oxide surface without deteriorating the optical characteristics of the optical article. Aim.

[0019]

According to the present invention, there is provided an optical article having an antifogging property, comprising an oxide mainly comprising an oxide on the surface thereof, wherein organosilane or / and a hydrolyzate thereof is coated on the surface of the article with a surfactant. The agents are processed sequentially or simultaneously. Thereby, the intermolecular interaction acts on the chain hydrocarbon chain of the base material and the chain hydrocarbon chain of the surfactant,
When the surfactant is anionic, electrostatic interaction acts between nitrogen and molecules on the substrate side. Due to these interactions, the surfactant is strongly bonded to the base material, so that the surface of the oxide film can be given a long-lasting anti-fog performance.

In the case of an optical article made of glass containing silicon oxide as a main component, there is no major problem in scratch resistance, but an optical article made of a synthetic resin is easily scratched, and the scratch resistance must be improved. In order to improve the scratch resistance of the synthetic resin, a hard coat treatment is often performed. In particular, a hard coat containing colloidal silica is effective and widely used. In the case of a spectacle lens or the like, an antireflection film made of an inorganic substance is formed on the surface to improve the optical characteristics. A low refractive index layer is formed as the uppermost layer of the antireflection film, but silicon dioxide is widely used in terms of durability and ease of handling. As described above, silicon dioxide is often used for the improvement of scratch resistance and the antireflection film, and silicon dioxide is often present on the surface of not only inorganic glass but also optical articles made of synthetic resin. . Even when a film made of an organic material is used as the antireflection film, if the uppermost layer contains colloidal silica, silicon dioxide will be present on the surface.

The present invention provides an optical article made of glass containing silicon dioxide and a metal oxide as main components, an optical article made of a synthetic resin having a hard coat containing colloidal silica and a metal oxide applied on the surface, and a silicon dioxide and The present invention can be applied to an optical article having an antireflection film using a metal oxide, and in any case, an article having silicon dioxide and a metal oxide on the surface.

The organosilane and / or its hydrolyzate used in the present invention preferably contains a chain saturated hydrocarbon containing at least one nitrogen. The chain saturated hydrocarbon has 3 to 20 carbon atoms, preferably 12 to 18 carbon atoms. One nitrogen atom is located at the end of the hydrocarbon chain, and the positions of the other nitrogen atoms are not limited. The reaction with silicon dioxide and metal oxide present in the outermost layer is performed by using a silane coupling agent having a group that reacts with silanol on the substrate side, such as chlorosilane, alkoxysilane, or silazane. A reaction with silanol of the metal oxide can be realized. This is a commonly used method.

As such an organosilane, 18-
Aminooctadecyltrichlorosilane, 16-aminohexadecyltrichlorosilane, 12-aminododecyltrichlorosilane, 18-aminooctadecylmethyldichlorosilane, 16-aminohexadecylmethyldichlorosilane, 12-aminododecylmethyldichlorosilane,
18-aminooctadecyltrimethoxysilane, 16-
Aminohexadecyltrimethoxysilane, 12-aminododecyltrimethoxysilane, 18-aminooctadecylmethyldimethoxysilane, 16-aminohexadecylmethyldimethoxysilane, 12-aminododecylmethyldimethoxysilane, 18-aminooctadecyltrimethoxysilane, 16- Aminohexadecyltrimethoxysilane, 12-aminododecyltrimethoxysilane, 12
-Aminododecylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, 4-aminobutyltriethoxysilane, 3-aminopropyltrimethoxysilane, 18-aminooctadecyldimethylchlorosilane,
16-aminohexadecyldimethylchlorosilane, 12
-Aminododecyldimethylchlorosilane, 18-aminooctadecyldimethylmethoxysilane, 16-aminohexadecyldimethylmethoxysilane, 12-aminododecyldimethylmethoxysilane, 6-azidosulfonylhexyltriethoxysilane, 6- (2-aminoethylaminohexyl) Trimethoxysilane, 3- [2- (2
-Aminoethylaminoethylamino) hexyl] trimethoxysilane, 3-morpholinopropyltrimethoxysilane, 3-piperazinopropyltrimethoxysilane,
Examples include, but are not limited to, 11-cyanoundecyltrimethoxysilane, 3-cyanopropyltrimethoxysilane, 3-cyanopropyltrichlorosilane, and N- (3-diethoxymethylsilylpropyl) sacaniimide.

In order to enhance the reactivity between the organosilane and the oxide, it is effective to perform a plasma treatment and an alkali treatment on silicon dioxide and metal oxides existing on the surface in advance.
The anti-fog effect is also improved.

The surfactants used in the present invention include surfactants such as anionic surfactants, nonionic surfactants, cationic surfactants and double-sided surfactants, and reactive derivatives thereof. It is desirable to include a chain saturated hydrocarbon as the hydrophobic moiety. From the interaction with the nitrogen-containing group on the organosilane side, an anionic surfactant is preferable, and an anionic surfactant in which the anionic group is sulfuric acid or sulfate is more preferably used. The number of carbon atoms is 4 to 20, preferably 12 to 18, and more preferably 1 to 3 less than the number of carbon atoms of the chain-containing organosilane. As a result, the chain hydrocarbon chain on the substrate side and the chain hydrocarbon chain of the surfactant are intermolecularly interacted, and the terminal nitrogen on the substrate side and the sulfate group of the surfactant are electrostatically interacted. Connect tightly. The antifogging substance to be used may be one kind of a specific compound or a mixture of two or more kinds.

Specific examples of the anionic surfactant include: alkyl sulfate esters such as sodium lauryl sulfate, sodium higher alcohol sulfate and triethanolamine lauryl sulfate; alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate; Alkyl naphthalene sulfonates such as sodium naphthalene sulfonate; alkyl sulfosuccinates such as sodium dialkyl sulfosuccinate; alkyl diphenyl ether disulfonates such as alkyl diphenyl ether disulfonate sodium; alkyl phosphates such as potassium alkyl phosphate A sodium polyoxyethylene lauryl ether sulfate, a sodium polyoxyethylene alkyl ether sulfate, and a triethanol alcohol polyoxyethylene alkyl ether sulfate; Polyoxyethylene alkyl (or alkyl allyl) sulfate such as sodium polyoxyethylene alkyl phenyl ether sulfate; special reactive anionic surfactant; special carboxylic acid surfactant; β-naphthalenesulfonic acid formalin condensate Naphthalenesulfonic acid formalin condensate such as sodium salt of sodium or special aromatic sulfonic acid formalin condensate; Special polycarboxylic acid type polymer surfactant; Polyoxyethylene alkyl phosphate ester. Examples of the nonionic surfactant include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene alkyl ether such as polyoxyethylene higher alcohol ether, and polyoxyethylene nonyl. Polyoxyethylene alkylaryl ethers such as phenyl ether; polyoxyethylene derivatives; sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan monooleate, sorbitan trioleate, sorbitan sesquioleate,
Sorbitan fatty acid esters such as sorbitan distearate; polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, Polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monooleate and polyoxyethylene sorbitan trioleate; polyoxyethylene sorbitol fatty acid esters such as polyoxyethylene sorbite tetraoleate; glycerol monostearate, glycerol monooleate, self Glycerin fatty acid esters such as emulsified glycerol monostearate; polyethylene glycol monolaure DOO, polyethylene glycol monostearate, polyethylene glycol distearate,
Polyoxyethylene fatty acid esters such as polyethylene glycol monooleate: polyoxyethylene alkylamine; polyoxyethylene hydrogenated castor oil; alkyl alkanolamide and the like.

Examples of the cationic surfactant and the double-sided surfactant include alkylamine salts such as coconutamine acetate and stearylamine acetate; lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, cetyltrimethylammonium chloride, and distearyldimethylammonium. Quaternary ammonium salts such as chloride and alkyl benzyldimethyl ammonium chloride: alkyl betaines such as lauryl betaine, stearyl betaine, lauryl carboxymethyl hydroxyethyl imidazolinium betaine; and amine oxides such as lauryl dimethylamine oxide.

The oxide used in the present invention is not limited to silicon dioxide, but may be any metal oxide film that reacts with organosilane. However, in view of the reactivity of the organosilane, silicon dioxide is preferred. The oxide film used in the present invention may be formed by any method such as evaporation, sputtering, CVD, and dehydration condensation of a condensable organometallic compound.

It is important that the formed treatment layer is a thin film that does not adversely affect the reflectance characteristics of the antireflection layer, and the thickness is preferably 300 ° or less, but the thickness is determined in consideration of the refractive index of the thin film. It is also possible to incorporate a thin film as antireflection.

By the above operation, the hydrophilic portion of the surfactant is present on the outermost surface of the optical article having the oxide on the surface. In order to obtain anti-fog performance, the static contact angle with water is desirably 10 ° or less, but in order to obtain sufficient performance, 5 ° or less is required.
This can be achieved by increasing the number of active sites on the surface and increasing the amount of surfactant retained. Further, a method of increasing the packing ratio of the hydrophilic group depending on the structure of the surfactant used is also possible.

The optical article having anti-fog performance obtained by the present invention has good durability, excellent scratch resistance, and excellent optical properties such as anti-reflection, and is suitable for spectacle lenses, camera lenses, and mirrors in bathrooms. It can be applied to underwater glasses, window glasses, microwave oven windows, car window glasses, telescope lenses, ski goggles, lenses of optical equipment used in humid places, mirrors, and the like.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION <Preparation of oxide film> In a reaction vessel equipped with a stirrer, isopropyl alcohol was added.
8 g, 300.0 g of distilled water, 139.4 g of γ-glycidoxypropyltriethoxysilane, and 38.2 g of a 0.05 N hydrochloric acid aqueous solution were added, and the mixture was stirred for 60 minutes. Next, a composite sol of titanium oxide / zirconium oxide / silicon oxide ("Optreak 1120Z (U25A
8) ") 403.3 g 0.3 g of a silicone-based surfactant (" L-7604 "manufactured by Nippon Unicar Co., Ltd.) was added,
After sufficiently stirring, a coating liquid was obtained.

The above-mentioned coating solution was previously immersed in a sodium hydroxide solution (0.1N), washed well with water and dried, and then applied to a plastic lens (a lens fabric for Seiko Super Sovereign, manufactured by Seiko Epson Corporation, refractive index 1.67). Is applied by dipping to a thickness of 2.5 μm.
The composition was cured by heating at 135 ° C. for 2.5 hours. After performing a plasma treatment (argon plasma 400 W × 60 seconds) on the surface of the lens thus obtained, an anti-reflection film made of an inorganic substance, silicon dioxide and zirconium oxide, is multi-layer coated by a vacuum deposition method, and hard-coated. A coat, a plastic lens with antireflection, and a substrate A were prepared. The static contact angle of the substrate A with water was 5 °.

[Example 1] 1. Organosilane treatment 11-cyanoundecyldimethylchlorosilane 0.5 g
Was dissolved in 199.5 g of n-hexane at 25 ° C. for 1 hour. Thereafter, the substrate was taken out and washed with n-hexane. Thereby, the organosilane was reacted with the oxide surface. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. At this time, the contact angle with water was 44 °, and it was confirmed that the organosilane was fixed on the surface.

2. Surfactant treatment 0.5 g of sodium lauryl sulfoacetate was added to distilled water 19
The surfactant solution was prepared by dissolving in 9.5 g. 25
The substrate treated with the above-mentioned organosilane was immersed in this liquid kept at 0 ° C. for 1 hour and air-dried. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. At this time, the contact angle with water was 3 °, and it was confirmed that the hydrophilic group was present on the outermost surface.

The method for evaluating the antifogging property of the obtained optical article is “J
The anti-fog properties of low temperature parts of IS-S4030 "Test method for anti-fog agent for spectacles" were evaluated with grades 1 to 4.
(The first grade has the best anti-fog performance, and the fourth grade is the worst.) Here, the second grade or higher was set to a practical level. The abrasion resistance was evaluated by the method of scratching when rubbing the reciprocating surface with a load of 1 kg with Bonstar # 0000 steel wool (manufactured by Nippon Steel Wool Co., Ltd.).
(A: There is no scratch within the range of 1 cm * 3 cm.
B: 1 to 10 scratches are made within the above range. C: 11 to 100 scratches are made in the above range. D: Countless scratches are formed within the above range. Regarding the antifogging durability, the produced optical article was immersed in distilled water at 40 ° C. for 10 minutes, air-dried at room temperature for one day, and similarly evaluated for antifogging property. The evaluation results are summarized in Table 1.

Embodiment 2 Treatment with organosilane and surfactant treatment 0.8 g of 3- [2- (2-aminoethylaminoethylamino) hexyl] trimethoxysilane in ethanol 19
9.2 g, and then 0.5N aqueous hydrochloric acid solution 0.01
g were mixed and stirred at 25 ° C. for 2 hours. Next, 0.5 g of sodium lauryl sulfate was dissolved in this solution to obtain a treatment liquid. Here, the substrate A was immersed at 25 ° C. for 1 hour. Thereafter, the substrate was taken out, washed with ethanol, and air-dried. As a result, the surface of the oxide was reacted with the organosilane to retain the surfactant. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. At this time, the contact angle with water was 5 °, and it was confirmed that the organosilane and the surfactant were immobilized on the surface.

Embodiment 3 Organosilane treatment The substrate A after vapor deposition is kept in a vapor deposition tank, and 4-aminobutylmethyldichlorosilane 1c is kept in the vessel while maintaining the degree of vacuum.
c was injected and reacted. After that, the substrate was taken out.
At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. The contact angle with water at this time is 4
The angle was 9 °, and it was confirmed that the organosilane was immobilized on the surface.

2. Surfactant treatment Polyoxyethylene octyl phenyl ether 0.5g
Was dissolved in 199.5 g of distilled water to prepare a surfactant solution. The above-mentioned organosilane-treated substrate was immersed in this liquid kept at 25 ° C. for 1 hour and air-dried. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. At this time, the contact angle with water was 3 °, and it was confirmed that the hydrophilic group was present on the outermost surface.

[Embodiment 4] 1. Organosilane and Surfactant Treatment The substrate A after vapor deposition is held in a vapor deposition tank, and 4-aminobutylmethyldichlorosilane 1c is placed in the vessel while maintaining the degree of vacuum.
c and 1 cc of polyoxyethylene lauryl ether were injected and reacted. After that, the substrate was taken out. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. The contact angle with water at this time was 5 °.

Embodiment 5 Organosilane Treatment The above-described base material A was immersed in a solution of 0.5 g of 3-ethyl-6-ethyl-8-aminooctyltrichlorosilane dissolved in 199.5 g of n-hexane at 25 ° C. for 1 hour. Thereafter, the substrate was taken out and washed with n-hexane. Thereby, the organosilane was reacted with the oxide surface. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. The contact angle with water at this time is 78.
°, and it was confirmed that the organosilane was immobilized on the surface.

2. Surfactant treatment 0.5 g of sodium polyoxyethylene lauryl sulfate was dissolved in 199.5 g of distilled water to prepare a surfactant solution. The above-mentioned organosilane-treated substrate was immersed in this liquid kept at 25 ° C. for 1 hour and air-dried. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. The contact angle with water at this time was 20 °.

Comparative Example 1 The substrate A itself was used as Comparative Example 1.

Comparative Example 2 A sample was prepared in the same manner as in Example 1 except that magnesium fluoride was vacuum-deposited to a thickness of 100 nm instead of the antireflection film of the base material A. Was prepared.

[Comparative Example 3] The result of the organosilane treatment of Example 3 was used as a comparative example.

Comparative Example 4 0.5 g of polyoxyethylene lauryl ether was dissolved to prepare a treatment liquid. Here, the substrate A was immersed at 25 ° C. for 1 hour. Thereafter, the substrate was taken out, washed with ethanol, and air-dried. At this time, no significant change was observed in the appearance and antireflection characteristics of the lens. The contact angle with water at this time was 5 °.

[0048]

[Table 1]

According to the present invention, it is possible to hold a surfactant densely on a surface where an oxide is present, and to provide an optical element having an antifogging property which does not have an optical effect such as a decrease in antireflection characteristics. Articles can now be manufactured.

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 2H006 BA03 2H042 DA17 DA18 DB11 DC04 DE08 2K009 AA03 AA15 BB00 BB01 BB02 BB11 CC03 CC42 CC47 DD02 DD03 DD06 DD12 DD17 EE02 4F100 AA17A AG00 AH06B BA02 CA18B JL07 AA11A04 FAA FA30 FB05 FB06 GA01 GA04 GA11

Claims (7)

[Claims] 1. An article mainly comprising an oxide on the surface thereof, wherein the surface of the article is treated with an organosilane and / or a hydrolyzate thereof and a surfactant sequentially or simultaneously. Assignment method. 2. The method according to claim 1, wherein the non-coupling site of the organosilane is a chain saturated hydrocarbon containing at least one nitrogen. 3. The method according to claim 1, wherein the coupling site of the organosilane is an alkoxysilane, a chlorosilane, or a silazane. 4. The method according to claim 1, wherein the surfactant is an ionic surfactant. 5. The method according to claim 4, wherein the ionic surfactant is an anionic surfactant. 6. The method according to claim 4, wherein the ionic surfactant contains a sulfate group or a sulfate. 7. An optical article obtained by the method for imparting anti-fog performance according to any one of claims 1 to 6.