JPH11217558A - Stainproofing agent and formation of stainproofing layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antifouling agent capable of preventing adhesion of stain such as fingerprint, sebum, sweat, or the like, especially on the surface of an optical member such as a reflection preventing film, or the like, by including a specific organosilane and a prescribed fluorine-based compound. SOLUTION: This stainproofing agent contains (A) an organosilane compound of the formula [R<1f> -(CH2 )1 ]n (SiA4-n )M (R<1f> is a fluorine-containing substituent group; A is a hydrolyzable group; the number (n) of substitutions is 0<n<4; (l) is 0-3; (m) is 1-10) and (B) a hydroxyl group-containing fluorine-based compound of the formula R<2f> -OH (R<2f> is a fluorine-containing substituent group). An organosilazane containing an amino group as the hydrolyzable group A is preferable as the component A. A compound of the formula R<f> (OC3 F6 )n - O-(CF2 )m -(CH2 )1 -OH (R<f> is a 1-16C straight-chain or branched-chain perfluoroalkyl; (n) is 1-50: (l) and (m) are each 0-3 and 6>=m+l>0) is preferable as the component B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifouling agent used for forming an antifouling layer on the surface of various substrates requiring antifouling properties, and an antifouling layer using the antifouling agent. And a stain-proofing layer obtained by the method. In particular, an antifouling layer is formed on the surface of an optical member (antireflection film, optical filter, optical lens, liquid crystal display, CRT display, projection television, plasma display, EL display, etc.) without impairing the optical performance of various optical members. It relates to an antifouling agent which can be formed.

[0002]

2. Description of the Related Art Fingerprints, sebum, sweat, cosmetics, and the like are used for optical members such as antireflection films, optical filters, optical lenses, liquid crystal displays, CRT displays, projection televisions, plasma displays, and EL displays. Etc. often adhere.
It is not easy to remove such stains once they adhere, and this is a problem particularly in the case of an optical member with an antireflection film because the attached stains are conspicuous.

Therefore, as a means for solving such a problem of dirt, various techniques have been proposed for forming an antifouling layer on the surface of an optical member having a property that dirt hardly adheres and that can easily be wiped off even if it adheres.

[0004] For example, JP-A-64-86101 discloses an antifouling property in which an antireflection film mainly composed of silicon dioxide is provided on the surface of a substrate, and the surface is further treated with a compound containing an organic silicon substituent. Abrasion-resistant antireflective articles have been proposed. Japanese Patent Application Laid-Open No. 4-338901 proposes an antifouling and abrasion-resistant CRT filter in which the surface of a substrate is similarly coated with a silanol-organic polysiloxane. Japanese Patent Publication No. 6-29332 discloses an antifouling and low-reflection property having an antireflection film made of a mono- and di-silane compound containing a polyfluoroalkyl group and a halogen, alkyl or alkoxy silane compound on a plastic surface. Plastic has been proposed. Further, JP-A-7-16940 proposes an optical member in which a copolymer of a perfluoroalkyl (meth) acrylate and a monomer having an alkoxysilane group is formed on an optical thin film mainly composed of silicon dioxide. Have been.

[0005]

However, the conventional antifouling layer forming technique has insufficient antifouling properties,
In particular, stains such as fingerprints, sebum, sweat, and cosmetics are difficult to wipe off, and the antifouling performance is greatly reduced with use. Therefore, development of an antifouling layer having excellent antifouling properties and durability has been desired.

[0006] The present invention is to solve the above-mentioned problems of the prior art, and various substrates to be treated, particularly,
Excellent antifouling antifouling layer that prevents fingerprints, sebum, sweat, cosmetics, and other stains from adhering to the surface of optical members such as antireflection coatings, and makes it easy to wipe off even if they do. To
It is intended to be able to form with high durability.

[0007]

Means for Solving the Problems In order to achieve the above object, the present inventor has set forth the following formula (1).

[0008]

Embedded image _{^{[R 1f - (CH 2)}} l] n - (SiA 4-n) m (1) ( where, R ^1f is a substituent having a fluorine, A is hydrolyzable group, the substitution number n is 0 < n <4, l is an integer of 0 to 3, m is 1
An organic silane compound represented by the following formula:
Equation (2)

[0009]

^{Embedded image} R ^2f —OH (2) wherein R ^2f is a fluorine-containing compound having a hydroxyl group represented by the formula (2) (where R ^2f is a substituent having fluorine).

In particular, in the antifouling agent of the present invention, an embodiment in which the organosilane compound of the formula (1) is an organosilazane compound or a fluorine-containing compound having a hydroxyl group of the formula (2) is represented by the formula (3)

[0011]

[Image Omitted] R ^f- (OC ₃ F ₆ ) _n -O- (CF ₂ ) _m- (CH ₂ ) ₁ -OH (3) (where R ^f is a straight or branched chain having 1 to 16 carbon atoms) Perfluoroalkyl group, n is an integer of 1 to 50, m is 0
An integer from 1 to 3, 1 is an integer from 0 to 3, provided that 6 ≧ m + 1> 0
Which is a compound represented by the formula:

Further, as a method for forming an antifouling layer on a substrate to be treated using the antifouling agent of the present invention, a film of the antifouling agent of the present invention is formed on at least one surface of the substrate by a dry coating method. And a method for forming an antifouling layer, and the antifouling layer formed as described above.

The antifouling agent of the present invention contains an organic silane compound represented by a specific formula (preferably, an organosilazane compound of a specific formula) and a fluorine compound.
When an antifouling layer is formed on a substrate to be treated using this antifouling agent,
When the substrate to be processed is various optical members (anti-reflection film, optical filter, optical lens, liquid crystal display, CRT display, projection television, plasma display, EL display, etc.), their optical performance is impaired. In addition, it is possible to prevent the adhesion of dirt such as fingerprints, sebum, sweat, cosmetics, etc., and it is possible to easily wipe off the adhered dirt, and the durability of the antifouling layer becomes excellent. In particular, when an organosilane compound having a hydrolyzable amino group is used as the organic silane compound, the adhesion between the antifouling layer and the substrate to be treated increases,
The antifouling layer obtained in this way is more excellent in antifouling properties and durability.

Further, when the antifouling layer is formed by the dry coating method according to the method of forming the antifouling layer of the present invention, the antifouling agent is formed at the time of forming the antifouling layer as compared with the case of forming by the wet coating method. Since the use of a diluting solvent is unnecessary, the safety in forming the antifouling layer is enhanced, and the thickness of the antifouling layer can be accurately controlled.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The antifouling agent of the present invention has the formula (1)

[0017]

Embedded image _{^{[R 1f - (CH 2)}} l] n - (SiA 4-n) m (1) ( where, R ^1f is a substituent having a fluorine, A is hydrolyzable group, the substitution number n is 0 < n <4, l is an integer of 0 to 3, m is 1
An organic silane compound represented by the following formula:
Equation (2)

[0018]

^{Embedded image} and a fluorine-containing compound having a hydroxyl group represented by R ^2f —OH (2) (where R ^2f is a substituent having fluorine).

Here, in the organosilane compound of the formula (1), the substituent R ^1f having fluorine is, for example, C
Examples thereof include a linear or branched perfluoroalkyl group of 1 to C16.

In the organosilane compound of the formula (1), the hydrolyzable group A is a reactive group that binds to a hydroxyl group on the surface of the substrate to be treated, thereby forming an antifouling layer on the substrate to be treated. it is conceivable that. Therefore, it is considered that the higher the reactivity of the hydrolyzable group A, the higher the adhesion between the obtained antifouling layer and the substrate to be treated. Therefore, as the hydrolyzable group A, alkoxide groups (such as —OCH ₃ , —OC ₂ H ₅ , —OC ₃ H ₇ ), halogen elements (such as —Cl, —Br), An amino group (such as —NH ₂ ) is exemplified. Of these, it is known that the alkoxide group remains partially without hydrolysis. Therefore, as the hydrolyzable group A, an amino group having particularly high reactivity is preferable.

As the organosilane compound of the formula (1) wherein the hydrolyzable group A is an amino group, that is, an organosilazane compound, more specifically, n-CF ₃ (CH ₂ ) ₂ Si (N
H) _3/2 , n-C ₃ F ₇ (CH ₂ ) ₂ Si (NH) _3/2 , n-C ₄ F
₉ (CH ₂ ) ₂ Si (NH) _3/2 , n-C ₆ F ₁₃ (CH ₂ ) ₂ Si (N
H) _3/2 , nC ₈ F ₁₇ (CH ₂ ) ₂ Si (NH) _{3/2 and the} like. Particularly, nC ₈ F ₁₇ (CH ₂ ) ₂ Si (NH) _3/2 is preferable.

The substitution number n in the organic silane compound of the formula (1) is preferably 0 <n <4.

On the other hand, examples of the fluorine compound represented by the formula (2) include n-CF ₃ (CH ₂ ) ₂ OH and n-C ₃ F ₇ (CH ₂ ) ₂
OH, n-C ₄ F ₉ (CH ₂ ) ₂ OH, n-C ₆ F ₁₃ (CH ₂ ) ₂ O
H, nC ₈ F ₁₇ (CH ₂ ) ₂ OH and the like are exemplified.

The fluorine compound represented by the formula (2) includes a compound represented by the formula (3)

[0025]

[Image Omitted] R ^f- (OC ₃ F ₆ ) _n -O- (CF ₂ ) _m- (CH ₂ ) ₁ -OH (3) (where R ^f is a straight or branched chain having 1 to 16 carbon atoms) Perfluoroalkyl group, n is an integer of 1 to 50, m is 0
An integer from 1 to 3, 1 is an integer from 0 to 3, provided that 6 ≧ m + 1> 0
Is preferable, and particularly, when R ^{f is-}
Fluorine compounds such as CF ₃ , —C ₂ F ₅ and —C ₃ F ₇ are preferred.

The antifouling agent of the present invention can contain various additives as required in addition to the above-mentioned organosilane compound of the formula (1) and the fluorine-based compound of the formula (2). For example, a catalyst that promotes hydrolysis and polycondensation of the organosilane compound of the formula (1) can be contained.

Examples of such a catalyst include hydrochloric acid, nitric acid, sulfuric acid, acetic acid, hydrofluoric acid, formic acid, phosphoric acid, oxalic acid, ammonia, aluminum acetylacetonate, dibutyltin dilaurate, tin octylate compound, methanesulfonic acid, and trifluorofluorocarbon. Examples thereof include methanesulfonic acid, paratoluenesulfonic acid, and trifluoroacetic acid. These may be used alone or in combination of two or more.

The substrate to be treated with the antifouling agent of the present invention for forming an antifouling layer is not particularly limited.
Or, an ordinary optical member composed of an inorganic substrate such as a glass plate containing an inorganic compound layer, a transparent plastic substrate, or an organic substrate such as a transparent plastic substrate containing an inorganic compound layer can be used.

Among them, a glass plate can be mainly used as the inorganic substrate. Examples of the inorganic compound that forms the glass plate containing the inorganic compound layer include metal oxides such as silicon oxide (silicon dioxide, silicon monoxide), aluminum oxide, magnesium oxide, titanium oxide, tin oxide, zirconium oxide, and sodium oxide. , Antimony oxide, indium oxide, bismuth oxide, yttrium oxide, cerium oxide, zinc oxide, ITO (Indium Tin Oxi
de) etc.), metal halides (magnesium fluoride, calcium fluoride, sodium fluoride, lanthanum fluoride,
Cerium fluoride, lithium fluoride, thorium fluoride, etc.)
Can be given.

The inorganic substrate or the inorganic compound layer composed of these inorganic compounds may have a single-layer or multilayer structure, and these may be formed by a wet coating method (dip coating method, spin coating method, flow coating method, spray coating method, Roll coating method, gravure coating method, etc.), PVD (Physical V
apor Deposition method (vacuum deposition method, sputtering method, ion plating method), CVD (Chemical Vap
or Deposition) method.

Further, among the organic base materials to be treated,
Examples of the transparent plastic substrate include substrates composed of various organic polymers. In general, substrates used as optical members are made of polyolefin (polyethylene, polypropylene) in view of optical properties such as transparency, refractive index, and dispersibility, and various physical properties such as impact resistance, heat resistance, and durability. Polyester) (polyethylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polystyrene,
Polyvinyl chloride, polyimide, polyvinyl alcohol,
A transparent plastic substrate made of ethylene vinyl alcohol, acrylic, cellulose (triacetyl cellulose, diacetyl cellulose, cellophane, etc.), or a copolymer of these organic polymers, etc. These substrates can also be mentioned.

Known additives such as an antistatic agent, an ultraviolet absorber, and the like are added to the organic polymer constituting the organic base material.
Those containing a plasticizer, a lubricant, a coloring agent, an antioxidant, a flame retardant and the like can also be used.

The shape of the inorganic or organic substrate to be treated is not particularly limited, but the transparent plastic substrate used as an optical member is usually in the form of a film or sheet. The film- or sheet-like antifouling agent of the present invention can be used as a substrate to be treated. The film or sheet substrate may be a single layer or a laminate of a plurality of organic polymers. The thickness is not particularly limited, but is preferably 0.01 to 5 mm.

Further, as the inorganic compound layer of the substrate to be treated in which the inorganic compound layer is formed on the above-mentioned organic substrate, the same inorganic compound as the above-mentioned inorganic compound layer constituting the inorganic substrate is used. And can be formed by a similar method.

The optical member used as the substrate to be treated in the present invention may have a hard coat layer between the transparent plastic substrate and the inorganic compound layer. By providing this hard coat layer, the hardness of the base material surface is improved, the base material surface is smoothed, and the adhesion between the transparent plastic base material and the inorganic compound layer is improved. And the occurrence of cracks in the inorganic compound layer due to the bending of the transparent plastic substrate can be suppressed, and the mechanical strength of the optical member can be improved.

The hard coat layer is not particularly limited as long as it has transparency, moderate hardness and mechanical strength. For example, a resin cured by irradiation with ionizing radiation or ultraviolet rays or a thermosetting resin can be used, and particularly, an ultraviolet ray-curable acrylic resin, an organosilicon resin, or a thermosetting polysiloxane resin is preferable. More preferably, these resins have the same or similar refractive index as the transparent plastic substrate.

The hard coat layer having a thickness of 3 μm or more provides sufficient strength, but preferably has a thickness of 5 to 7 μm from the viewpoint of transparency, coating accuracy and handleability.

The hard coat layer has an average particle size of 0.0
By mixing and dispersing inorganic or organic particles having a particle size of 1 to 3 μm, or by making the surface shape uneven, a light diffusion treatment generally called anti-glare can be performed.
Although these fine particles are not particularly limited as long as they are transparent, low refractive index materials are preferable, and silicon oxide and magnesium fluoride are preferable in terms of stability, heat resistance and the like.

As a method for applying such a hard coat layer, any method may be used as long as it is applied uniformly.

Specific examples of uses of the optical member of the present invention in which the antifouling agent is a substrate to be treated include, for example, an antireflection film, an optical filter, an optical lens, a liquid crystal display, a CRT display, a projection television, a plasma display, and an EL. Examples thereof include a display and the like, which can be manufactured by a known method.For example, an anti-reflection film is formed on at least one surface of a transparent plastic substrate by a known method of forming a single-layer or multilayer thin film of an inorganic compound. It can be formed by the method described above.

The method of forming an antifouling layer on the substrate to be treated using the antifouling agent of the present invention is not particularly limited, and may be any of wet coating methods (dip coating method, spin coating method, flow coating method). , Spray coating, roll coating, gravure coating, etc.) and dry coating [vacuum deposition (resistance heating, electron beam, high frequency heating, ion beam, etc.), sputtering, C
VD method (plasma CVD method, optical CVD method, thermal CVD method, etc.)]. By using the antifouling agent of the present invention in any method, an antifouling layer can be formed on at least one surface of the substrate to be treated.

In the case of the wet coating method, the diluting solvent is not particularly limited, but the stability of the composition,
In consideration of volatility and the like, perfluorohexane, perfluoromethylcyclohexane, perfluoro-1,3-
Examples thereof include ordinary perfluoroaliphatic hydrocarbons having 5 to 12 carbon atoms such as dimethylcyclohexane, polyfluorinated aromatic hydrocarbons such as bis (trifluoromethyl) benzene, and polyfluorinated aliphatic hydrocarbons. Further, the solvent may be used not only as one kind but also as a mixture of two or more kinds.

However, from the viewpoint of controlling the working environment when forming the antifouling layer and controlling the thickness of the antifouling layer, it is preferable to use a dry coating method which does not require a diluting solvent. preferable.

That is, the conventional antifouling layer is produced by applying an antifouling agent to the surface of the substrate to be treated by a wet coating method. In such a wet coating method, since an antifouling agent is used after being diluted with a volatile solvent, environmental measures or fire prevention measures are required, and there is a disadvantage that workability is poor. Another problem is that it is difficult to control the film thickness accurately.

In general, an antifouling agent made of an organometallic compound has low solubility in general organic solvents, and it is difficult to use chlorofluorocarbons such as 1,1,3-trichlorotrifluoroethane, which is an object of chlorofluorocarbon regulation. However, there is also a problem that it is stably dissolved only in expensive fluorohydrocarbons.

On the other hand, the dry coating method is
There is an advantage that a diluting solvent need not be used.

In addition, the thickness of the antifouling layer, which has been difficult in the past, can be accurately controlled on the order of angstroms.
An optical member having a desired antifouling layer can be provided. further,
An optical member having an antireflection film can easily impart antifouling properties without changing the interference color of the antireflection film for which color setting is difficult.

When the antifouling layer is formed by a dry coating method, its thickness varies depending on the evaporation amount of the antifouling agent. Therefore, in order to accurately control the thickness of the antifouling layer, it is preferable to accurately control the evaporation amount of the antifouling agent.

After the antifouling layer is formed on the substrate to be treated by the dry coating method or the wet coating method, if necessary, heating, humidification, light irradiation, electron beam irradiation, etc. may be performed. .

The film thickness of the antifouling layer thus formed is not particularly limited, but is usually preferably 10 to 500 ° from the viewpoint of antifouling property, scratch resistance and optical performance of the optical member.

[0051]

The present invention will now be described in detail with reference to Examples, but it should be understood that the present invention is by no means restricted to such specific Examples.

Example 1 CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ Si (NH) _3/2 was _converted to bis (trifluoromethyl) benzene in a 100 ml two-necked flask equipped with a stirrer and a dropping funnel. (KP801M: manufactured by Shin-Etsu Chemical Co., Ltd.) (0.13
It was added g), while sufficiently stirring continued, C ₃ F ₇ from the dropping funnel _{- (OC 3 F 6) 24} -O- (CF 2) 2 -CH 2 -OH (0.
13 g) was added dropwise to synthesize an antifouling agent.

A substrate obtained by laminating a hard coat layer and an antireflection film on a triacetyl cellulose film is used as a substrate to be treated, and the above-mentioned antifouling agent is formed thereon by a vacuum deposition method (resistance heating method). A layer was formed.

When performing the vacuum deposition method, the solid content of the antifouling agent in the boat was set to 5 mg and 5 × 10 ⁻⁵ Torr
After evacuation as described below, the boat was heated to 400 ° C. to evaporate the antifouling agent.

Comparative Example 1 CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ Si (NH) _3/2 (KP801M:
(Shin-Etsu Chemical Co., Ltd.) was used as an antifouling agent, and an antifouling layer was formed on the antireflection film in the same manner as in Example 1.

Evaluation The antifouling layers obtained in the above Examples and Comparative Examples were used as samples.
The following various physical property evaluations were performed. Table 1 shows the results.

(A) Contact angle measurement: Contact angle meter (CA-X)
Type: Kyowa Interface Science Co., Ltd.)
(C-65% RH), a droplet having a diameter of 1.8 mm was formed at the needle tip, and this was brought into contact with the surface of the sample (solid) to form a droplet. The contact angle is an angle formed by a tangent to the liquid surface at a point where the solid and the liquid come into contact with each other, and is defined as an angle including the liquid. Distilled water and n-hexadecane were used as liquids.

(B) Fall angle measurement: Fall angle meter (CA-X)
Type: Kyowa Interface Science Co., Ltd.)
(65 ° C.-65% RH), a droplet having a diameter of 3.0 mm was formed at the needle tip, and this was brought into contact with the surface of a horizontal sample (solid) to form a droplet. Next, gradually tilt this solid sample.
The droplet gradually deforms, and when the tilt angle reaches a certain angle, the droplet slides downward. The inclination angle at this time was defined as the falling angle. Distilled water and n-hexadecane were used as liquids.

(C) Adhesion of oily pen: A linear line of 1 cm in length was drawn on the surface of the sample using an oily pen (magic ink: No. 500 for fine writing), and the stickiness or conspicuousness was visually observed. The judgment was made. The criteria were as follows.

：: Handwriting with an oil-based pen is bursting into a ball ×: Handwriting with an oil-based pen is drawn without being repelled and a straight line is drawn

(D) Wipeability of oil-based pen: The oil-based pen adhered to the surface of the sample was replaced with a cellulose nonwoven fabric (Pencot M).
-3: manufactured by Asahi Kasei Corporation), and the easiness of removal was visually determined. The criteria were as follows.

：: Oily pen can be completely wiped off △: Oily pen wiping mark remains ×: Oily pen cannot be wiped off

(E) Fingerprint adhesion: A finger was pressed against the sample surface for a few seconds to attach a fingerprint, and a visual judgment was made to determine whether the fingerprint was sticky or noticeable. The criteria were as follows.

A: Adhesion of fingerprints was small, and attached fingerprints were not conspicuous. X: Adhesion of fingerprints could be confirmed.

(F) Wiping property of fingerprint: The fingerprint adhering to the sample surface was wiped off with a cellulose nonwoven fabric (Pencott M-3: manufactured by Asahi Kasei Corporation), and the ease of removal was visually determined. The criteria were as follows.

：: Fingerprint can be completely wiped off △: Fingerprint wiping mark remains ×: Fingerprint cannot be wiped off

(G) Abrasion resistance: The surface of the sample was a cellulose nonwoven fabric (Pencott M-3: manufactured by Asahi Kasei Corporation) with a load of 5
After rubbing 100 times with 00 gf, the various physical property evaluations (a) to (f) were performed.

[0068]

[Table 1] (In parentheses: properties after abrasion resistance test) Example 1 Comparative Example 1 Contact angle (°) distilled water 113.7 (111.4) 111.8 (110.4) n-hexadecan 74.5 (73.9) 70.5 (70.4) Fall angle (°) Distilled water 6.7 (7.0) 32.2 (34.0) n-Hexatecan 5.5 (5.9) 20.7 (22.8) Oily pen adhesion ○ (○) △ (△) Wiping off ○ (○) △ (△) Fingerprint adhesion ○ (○) × (×) Wipeability ○ (○) △ (△)

From Table 1, it can be seen that the antifouling layer of Example 1 is less wettable with distilled water and n-hexadecane, and that fingerprints and oily dirt are less likely to adhere than the antifouling layer of Comparative Example 1. It can be seen that the stains easily come off and have excellent antifouling properties. In addition, since the antifouling property of this example is maintained after the abrasion resistance test, it is understood that the excellent antifouling property of the example has durability.

[0070]

The antifouling layer formed on the surface of the optical member using the antifouling agent of the present invention has a higher optical performance than the conventional antifouling layer formed using the antifouling agent. It does not impair fingerprints, makes it difficult for dirt such as fingerprints, sebum, sweat, and cosmetics to adhere, makes it easy to wipe off even if it adheres, and is excellent in durability of such an antifouling effect.

Further, when the antifouling layer is formed by the dry coating method using the antifouling agent of the present invention, a diluting solvent for forming the antifouling layer is not required as compared with the conventional wet coating method. Accurate control of the thickness of the antifouling layer is also possible.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jiro Watanabe 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Yoshitaka Honda 2-4 Nakazaki-Nishi, Kita-ku, Osaka-shi, Osaka No. 12 Umeda Center Building Daikin Industries, Ltd.

Claims (8)

[Claims] 1. A formula (1) ## STR1 ## _{^{[R 1f - (CH 2)}} l] n - (SiA 4-n) m (1) ( where, R ^1f is a substituent having a fluorine, A is hydrolyzed Decomposing group, substitution number n is 0 <n <4, l is an integer of 0 to 3, m is 1
An organic silane compound represented by the following formula:
R ^2f —OH (2) (where R ^2f is a fluorine-containing substituent) and a fluorine-containing compound having a hydroxyl group represented by the formula (2). 2. The antifouling agent according to claim 1, wherein the organosilane compound represented by the formula (1) is an organosilazane compound. 3. A fluorine-containing compound having a hydroxyl group represented by the formula (2) is a compound represented by the formula (3): R ^f (OC ₃ F ₆ ) _n -O- (CF ₂ ) _m- (CH ₂ ) _1- OH (3) (where R ^f is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, n is an integer of 1 to 50, and m is 0)
An integer from 1 to 3, 1 is an integer from 0 to 3, provided that 6 ≧ m + 1> 0
The antifouling agent according to claim 1 or 2, wherein 4. A method for forming an antifouling layer, comprising forming the antifouling agent according to claim 1 on at least one surface of a substrate to be treated by a dry coating method. 5. After forming the antifouling agent according to claim 1 on at least one surface of the substrate to be treated, further heat the film.
The method for forming an antifouling layer according to claim 4, wherein humidification, light irradiation, or electron beam irradiation is performed. 6. The method for forming an antifouling layer according to claim 4, wherein the substrate to be treated is an optical member. 7. The method according to claim 6, wherein the optical member is an antireflection film. 8. An antifouling layer formed by the method according to claim 4.