WO2018164223A1

WO2018164223A1 - Film-forming composition, film-coated article, and production method for film-coated article

Info

Publication number: WO2018164223A1
Application number: PCT/JP2018/008964
Authority: WO
Inventors: 鈴木　慶一; 貴裕石▲ざき▼
Original assignee: ホヤレンズタイランドリミテッド; 学校法人芝浦工業大学
Priority date: 2017-03-08
Filing date: 2018-03-08
Publication date: 2018-09-13
Also published as: JP2020073619A

Abstract

A film-forming composition which comprises two or more alkoxysilane compounds represented by general formula 1, the two or more alkoxysilane compounds differing in n within general formula 1. In general formula 1, R1, R2, and R3 each independently represent an alkyl group and n is 0 or an integer of 1 or larger.

Description

Film-forming composition, article having film and method for producing article having film

The present invention relates to a film-forming composition, an article having a film, and a method for producing an article having a film. Specifically, it has a film-forming composition capable of forming an antifouling film, an article having a film formed from the film-forming composition, and a film including a film-forming step using the film-forming composition. The present invention relates to a method for manufacturing an article.

In various fields, a film is widely formed on the outermost layer of an article. With this film, various functions can be imparted to the surface of the article (see, for example, Patent Document 1).

JP-A-9-87402

In Patent Document 1, in order to provide a water-repellent surface, an alkyl group or a fluoroalkyl group is included, and at least one selected from an alkoxy group, an acetoxy group, an isocyanate group, and a halogen has a functional group bonded to a silicon atom. It describes that water-repellent treatment is performed using a silane compound (see paragraph 0025 of Patent Document 1).

On the other hand, “antifouling” can be cited as one of functions desired to be imparted by the coating. By imparting antifouling properties to the article surface by the coating, it becomes possible to suppress the adhesion of dirt to the article surface and to easily remove the attached dirt. The antifouling property does not necessarily mean the same property as the water repellency described in Patent Document 1, and the surface having water repellency does not necessarily have an excellent antifouling property. If excellent antifouling properties can be provided on the surface of the article, it is possible to prevent the quality and performance of the article from being deteriorated due to the adhesion of dirt. Therefore, it is desirable in various fields to provide excellent antifouling properties on the article surface.

An object of one embodiment of the present invention is to provide a means for providing an excellent antifouling property to an article surface.

One embodiment of the present invention provides:
The following general formula 1:

(In General Formula 1, R ¹ , R ² and R ³ each independently represents an alkyl group, and n represents 0 or an integer of 1 or more.)
A composition for forming a film, comprising two or more types of alkoxysilane compounds represented by formula (1), wherein the two or more types of alkoxysilane compounds have different n in the general formula (1):
About.

The film-forming composition is an alkoxysilane compound having a different n in general formula 1, that is, a chain length of an alkyl chain (CH ₃ — (CH ₂ ) n—) (hereinafter referred to as “alkyl chain length”). Contains two or more different alkoxysilane compounds. Thereby, the film formed from this film forming composition can impart excellent antifouling properties to the article surface.

According to one embodiment of the present invention, an article provided with a film having excellent antifouling properties can be provided.

One aspect of the present invention relates to the above-mentioned film forming composition.
Furthermore, according to one aspect of the present invention, the outermost layer includes a film including the article formed from the film-forming composition on the outermost layer and the film-forming step using the film-forming composition. A method of manufacturing an article is also provided.
Hereinafter, the composition for forming a film, the article, and the production method will be described in more detail.

[Coating composition]
<Alkoxysilane compound>
The film-forming composition contains two or more alkoxysilane compounds represented by the following general formula 1.

In General Formula 1, R ¹ , R ² and R ³ each independently represents an alkyl group, and n represents 0 or an integer of 1 or more.
Hereinafter, Formula 1 will be described in more detail.

In General Formula 1, R ¹ , R ² and R ³ each independently represents an alkyl group. R ¹ , R ² and R ³ may be the same alkyl group or different alkyl groups.

The alkyl group can be a linear alkyl group, a branched alkyl group or a cycloalkyl group, and is preferably a linear alkyl group. The alkyl group preferably has 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. Moreover, the said alkyl group may have a substituent and may be unsubstituted. When the alkyl group has a substituent, examples of the substituent include a hydroxy group, a cyano group, an amino group, a nitro group, an acyl group, and a carboxyl group. The alkoxysilane compound preferably does not contain a fluorine atom as a substituent. That is, the alkoxysilane compound preferably does not contain a fluorine atom. Forming a film using a compound containing no fluorine atom is preferable from the viewpoints of reducing manufacturing costs and environmental burdens. In addition, carbon number in the case of having a substituent shall mean the carbon number of the part which does not contain a substituent. The alkyl group is preferably unsubstituted. Preferred examples of the alkyl group include a methyl group, an ethyl group and a propyl group. A methyl group and an ethyl group are more preferred, and a methyl group is still more preferred.

In general formula 1, n represents 0 or an integer of 1 or more. Regarding n, the film-forming composition contains two or more alkoxysilane compounds having different n in the general formula, that is, alkoxysilane compounds having different alkyl chain lengths. The present inventors speculate that this contributes to imparting excellent antifouling properties to the surface of the article by providing a film formed from the above-mentioned compound for forming a film on the outermost layer of the article. Details will be described later. The difference in n between the two or more alkoxysilane compounds is 1 or more, and preferably 2 or more, more preferably 3 or more, and still more preferably from the viewpoint of imparting better antifouling properties to the article surface. Is 4 or more, more preferably 5 or more, even more preferably 6 or more, still more preferably 7 or more, and even more preferably 8 or more. From the same viewpoint, the difference in n between two or more alkoxysilane compounds is preferably 20 or less, more preferably 18 or less, still more preferably 16 or less, and 14 or less. More preferably.

Among the two or more types of alkoxysilane compounds represented by the general formula 1 contained in the film forming composition, the alkoxysilane compound having the largest n is referred to as a “first alkoxysilane compound”. N of an alkoxysilane compound becomes like this. Preferably it is 14 or more, More preferably, it is 15 or more, More preferably, it is 16 or more. Moreover, n of a 1st alkoxysilane compound becomes like this. Preferably it is 30 or less, More preferably, it is 25 or less, More preferably, it is 20 or less. On the other hand, when the alkoxysilane compound represented by the general formula 1 in which n is smaller than that of the first alkoxysilane compound is referred to as “second alkoxysilane compound”, n of the second alkoxysilane compound is 1 or more, It is preferably 2 or more, more preferably 3 or more, still more preferably 4 or more, and still more preferably 5 or more. Further, n of the second alkoxysilane compound is preferably 13 or less, more preferably 12 or less, and still more preferably 11 or less. One embodiment of the second alkoxysilane compound is an alkoxysilane compound in which n in the general formula 1 is in the range of 7 to 13, and another embodiment is an alkoxysilane compound in which n in the general formula 1 is in the range of 1 to 6. Silane compound. The film-forming composition contains one or more second alkoxysilane compounds and one or more second alkoxysilane compounds together with the first alkoxysilane compound having the largest n in general formula 1. But you can. That is, the film-forming composition includes two or more alkoxysilane compounds represented by the general formula 1 having different n (different alkyl chain lengths), and the included alkoxysilane compounds may be two or more. But you can. From the viewpoint of ease of improving the antifouling property, the types of the alkoxysilane compounds represented by the general formula 1 contained in the film forming composition are preferably 2 to 4 types, and 2 or 3 types. More preferably, it is more preferable that they are two types.

Regarding the mixing ratio of the above two or more types of alkoxysilane compounds, from the viewpoint of imparting better antifouling properties to the article surface, the content of the alkoxysilane compound having the maximum n (first alkoxysilane compound) is as described above. The total content (100% by mass) of the alkoxysilane compound represented by the general formula 1 contained in the film-forming composition is preferably 5.0% by mass or more, and preferably 10.0% by mass or more. More preferably, it is more preferably 20.0% by mass or more, further preferably 30.0% by mass or more, still more preferably 40.0% by mass or more, and 50.0% by mass. More preferably, it is 60.0% by mass or more, even more preferably 70.0% by mass or more, and even more preferably 80.0% by mass or more. It is even more preferably. The content of the alkoxysilane compound (first alkoxysilane compound) having the maximum n is preferably 95.0% by mass or less, and more preferably 90.0% by mass or less.

The alkoxysilane compound represented by the general formula 1 described above is available as a commercial product and can be synthesized by a known method. Specific examples thereof include, for example, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, pentyltrimethoxysilane, pentyltriethoxysilane, hexyltri. Examples include methoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, decyltrimethoxysilane, decyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane, etc. be able to.

<Other optional components>
The film-forming composition contains two or more types of alkoxysilane compounds described above. The film-forming composition may be a composition comprising these alkoxysilane compounds, and may optionally contain one or more known components as components of the film-forming composition such as a solvent and an additive. Known components can be applied to components that can be optionally included. Further, the concentration of the alkoxysilane compound in the film forming composition is not particularly limited, and may be set in consideration of, for example, a film forming method.

[Article having coating and method for producing the same]
A further aspect of the invention provides:
An article having, as an outermost layer, a film formed from the film-forming composition; and
A method for producing an article having a film on the outermost layer, comprising a film forming step using the film forming composition;
About. Below, the said article | item and manufacturing method are demonstrated in detail.

<Article>
The film-forming composition can be used to form a film on the outermost layer of various articles. By forming a film, the surface of the article on which the film is formed has excellent antifouling properties. be able to. As an article, the surface on which a film is formed (hereinafter referred to as “base surface”) is the surface of various substances such as an inorganic substance, an organic substance, and a composite material of an organic substance and an inorganic substance. Articles can be mentioned. Specific examples of the article include optical members such as lenses (for example, eyeglass lenses, sunglasses, etc.), window glass, building materials, transportation equipment, vehicle materials, semiconductor substrates, and the like. However, the present invention is not limited to these exemplified articles, and the articles having the above-mentioned coating film on the outermost layer are various articles that desirably have antifouling properties on the surface because there is a possibility that dirt may adhere during use. Can be. Moreover, the said film should just exist as an outermost layer in at least one part of articles | goods. Further, the shape of the surface (base surface) on which the film is formed is not limited, and may be any shape such as a flat surface or a curved surface. Forming a coating film of the above-mentioned film-forming composition on the base surface by the alkoxy group linked to the silicon molecule (Si) in the general formula 1 becoming a bond portion and / or an adsorption portion with the base surface. It is thought that you can. In addition, the film thickness thus formed can be in the range of 0.5 to 2.5 nm, for example. In one embodiment, the coating film may be a monomolecular film of the alkoxysilane compound. The monomolecular film is formed by fixing the molecule on the base surface by the terminal functional group becoming a binding portion and / or an adsorbing portion with the base surface, and has a film thickness that approximates the molecular length of one molecule. . Since the film-forming composition contains two or more types of alkoxysilane compounds, the present inventors believe that the film thickness of the monomolecular film can be controlled by the type and mixing ratio of these two or more types of alkoxysilane compounds. I guess. For example, the monomolecular film is considered to be thicker as the alkoxysilane compound having a longer molecular length is used. In addition, it is considered that the film thickness of the monomolecular film can be increased as the proportion of the alkoxysilane compound having a longer molecular length among the two or more types of alkoxysilane compounds is increased. On the other hand, for example, a film formed by further bonding molecules to the molecules bonded or adsorbed to the base surface is called a bimolecular film, and has a film thickness that exceeds the molecular length of one molecule and approximates the molecular length of two molecules. Have Monomolecular films tend to be easier to control film properties than multimolecular films such as bimolecular films. Monomolecular films tend to be superior in surface smoothness compared to multimolecular films such as bimolecular films. This point is preferable as a film formed on the outermost layer of an article that is desired to have excellent surface smoothness. Regarding the surface smoothness, the mean square roughness measured by a scanning probe microscope (SPM) on the surface of the coating can be, for example, 0.20 nm or more and 0.80 nm or less.

<Film formation process>
By using the film forming composition, a film formed from the film forming composition can be formed on the base surface. The presence of this coating on the outermost layer of the article can provide excellent antifouling properties on the article surface. The film may be formed by a dry film forming method or a wet film forming method. Prior to the formation of the coating, the base surface can be pretreated by a known method. As an example of the pretreatment, a treatment for introducing a hydroxy group (OH) onto the base surface can be mentioned. It is speculated that the introduced hydroxy group can contribute to the formation of chemical bonds and hydrogen bonds with silanol groups generated by hydrolysis of the alkoxysilane compound (details will be described later).

The wet film forming method is a method of forming a film through a step of applying a film forming composition onto a base surface, and the coating method includes known coating methods such as a spin coating method, a dipping method, and a spray coating method. Can be used. Preferably, the coating film can be formed by heating the coating layer of the coating film-forming composition after coating. By heating, the alkoxysilane compound contained in the coating layer can be hydrolyzed, and the coating layer can be dried. It is presumed that silanol groups (Si—OH) are generated by hydrolyzing the alkoxysilane compound, and that the silanol groups can contribute to bonding or adsorption with the base surface. For example, it is considered that hydrogen bonds may contribute to bonding or adsorption with the base surface, and the generated silanol groups react with hydroxy groups present on the base surface to form chemical bonds (—Si—O—). It is considered that the formation may contribute to the adhesion between the base surface and the coating. The film-forming composition may be an aqueous composition or a non-aqueous composition. “Aqueous” means containing water. Since the hydrolysis of the alkoxysilane compound can proceed even with moisture in the atmosphere, the film-forming composition may be a non-aqueous composition. Moreover, about the detail regarding heating, such as heating temperature, the well-known technique regarding the hydrolysis of a silane coupling agent is applicable.
On the other hand, as a dry film forming method, various methods including a step of volatilizing the film forming composition, for example, a vacuum deposition method, an ion assist method, an ion plating method, a reactive sputtering method, a chemical vapor deposition method ( CVD; chemical vapor deposition) and the like. Also in the dry film forming method, it is speculated that the generation of silanol groups (Si—OH) by hydrolysis of the alkoxysilane compound may contribute to the bonding or adsorption between the film and the base surface.

The film formed by the film forming process can exhibit excellent antifouling properties. By the way, regarding the antifouling property, the present inventors believe that lowering the contact angle hysteresis on the surface of the article contributes to increasing the antifouling property of the article surface. This point will be further described below.
The contact angle is roughly classified into a static contact angle and a dynamic contact angle. Generally, the contact angle used as an index of water repellency is a static contact angle with respect to water. In contrast, the dynamic contact angle can be an indicator of the dynamic behavior of the droplet. The contact angle hysteresis is obtained as a difference Δθ between the advancing contact angle (described as “θa”) and the receding contact angle (described as “θr”) of the dynamic contact angle. It is done. Δθ = θa−θr. It is considered that the rotational motion of molecules contributes to the contact angle hysteresis. In the alkoxysilane compound represented by the general formula 1, the present inventors presume that the rotational movement of the methyl group linked to the alkylene part contributes to the reduction of the contact angle hysteresis. Compared to a film formed using only one kind of alkoxysilane compound represented by the general formula 1, a film formed using two or more kinds has a longer alkyl chain length (n in the general formula 1 is It is considered that the methyl group connected to the alkylene part in the alkoxysilane compound (which is larger) exists in a state in which it is more likely to rotate. The present inventors speculate that this may contribute to lowering the contact angle hysteresis. However, the above is inference and does not limit the present invention.

In the present invention and the present specification, the advancing contact angle and the receding contact angle are measured by the expansion / contraction method in a measurement environment having a temperature of 22 to 25 ° C. and a relative humidity of 35 to 60%. It is assumed that the advancing contact angle and the receding contact angle are measured at arbitrary five locations, respectively, and the contact angle hysteresis is calculated using the arithmetic average of the measured values. The water contact angle hysteresis measured on the surface of the coating is preferably 10.0 ° or less, more preferably 9.5 ° or less, and even more preferably 9.0 ° or less. More preferably, it is not more than 0.5 °, and more preferably not more than 8.0 °. Further, the contact angle hysteresis measured on the surface of the film can be, for example, 3.0 ° or more, 4.0 ° or more, 5.0 or more, or 6.0 ° or more. However, it is considered that the smaller the value of the contact angle hysteresis, the better from the viewpoint of antifouling properties.

In one embodiment, the coating surface can have excellent water repellency. A static contact angle can be used as an index of water repellency. In one embodiment, the surface of the coating film may have a static contact angle with respect to water of 90.0 ° or more, preferably 95.0 ° or more, and more preferably 100.0 ° or more. The static contact angle for water can be, for example, 120.0 ° or less, but may exceed this. In the present invention and the present specification, the static contact angle is obtained as an arithmetic average of values measured at any five locations by the droplet method in a measurement environment having a temperature of 22 to 25 ° C. and a relative humidity of 35 to 60%. To do.

Furthermore, according to the present invention, the article has a monomolecular film of an alkoxysilane compound (but does not contain fluorine atoms) as at least a part of the outermost layer, and the contact angle hysteresis with respect to water on the surface of the outermost layer is 10 Articles that are less than or equal to 0 ° are also provided. For details of such articles, reference may be made to the above description.

Hereinafter, the present invention will be further described with reference to examples. However, the present invention is not limited to the embodiment shown in the examples.

The alkoxysilane compounds used in the following examples and comparative examples are the following commercially available alkoxysilane compounds.
HXS (Hexyltrimethylsilane): In General Formula 1, R ¹ , R ² , R ³ = CH ₃ , n = 5
OTS (Octyltrimethylsilane): In the general formula 1, R ¹ , R ² , R ³ = CH ₃ , n = 7
DCS (Decytrimethylsilane): In the general formula 1, R ¹ , R ² , R ³ = CH ₃ , n = 9
DDS (Dodecyltrimethylsilane): In General Formula 1, R ¹ , R ² , R ³ = CH ₃ , n = 11
HDS (Hexadecyltrimethylsilane): In General Formula 1, R ¹ , R ² , R ³ = CH ₃ , n = 15
ODS (Octadecyltrimethylsilane): In General Formula 1, R ¹ , R ² , R ³ = CH ₃ , n = 17

1. Pretreatment of lower ground A glass plate having a size of 10 mm × 20 mm was prepared as a sample, and ultrasonic cleaning was performed for 10 minutes in order of acetone, ethanol, and ultrapure water in order to remove surface deposits. The sample surface after washing with an organic solvent (acetone, ethanol) was dried with a nitrogen gun.
The sample surface after the cleaning was irradiated with vacuum ultraviolet (VUV) for 20 minutes under atmospheric pressure. The VUV irradiation treatment was performed using an ultraviolet irradiator (manufactured by USHIO INC.) Equipped with a VUV lamp manufactured by USHIO ELECTRIC CO., LTD. (Model: SUS713, wavelength λ = 172 nm, light intensity of 10 mW / cm ² or more). By this VUV treatment, the amount of hydroxy groups on the sample surface can be increased. Using the sample surface thus treated with VUV as a base surface, a film was formed on the base surface by the method described below.

2. Preparation of Film Forming Composition A single alkoxysilane compound or a mixture of two alkoxysilane compounds was prepared as a film forming composition. The total amount of the film forming composition (alkoxysilane compound) was 180 μL or 200 μL. The compositions of the prepared film forming compositions are shown in Tables 5 and 6 below.

3. Film formation step 2. Using the respective film-forming compositions prepared in 1 above, the above-described 1. A film was formed on the base surface prepared in (1). Film formation by thermal chemical vapor deposition was performed as follows.
Sample tube bottle containing the film-forming composition and the above 1. The samples after the pretreatment were sealed together in a Teflon (registered trademark) container (diameter 12 cm × height 5 cm) in a glove box maintained at a relative humidity of 15%. Thereafter, the furnace was heated and held for 24 hours in an electric furnace set at a furnace temperature of 100 ° C.

4). Evaluation Method (1) Contact Angle Measurement The static contact angle was measured by the droplet method, and the dynamic contact angle (advanced contact angle and receding contact angle) was measured by the expansion / contraction method. Table 1 shows the measurement conditions for the static contact angle and the dynamic contact angle. Water is used as the measurement liquid, and the static contact angle, advancing contact angle, and receding contact angle are measured at five randomly determined locations on the coating surface, and an automatic contact angle meter (Model: DM-501 (manufactured by Kyowa Interface Science Co., Ltd.) was used. The measurement was performed in a measurement environment at a temperature of 22 to 25 ° C. and a relative humidity of 35 to 60%.

(2) Film thickness measurement of film The film thickness was measured with an ellipsometer at five randomly defined positions on the film surface, and the film thickness of the film was determined as an arithmetic average of the measured values. As the ellipsometer, an ultra-small ellipsometer (Model: MACO-101, manufactured by Fibrabo) was used, and the film thickness was measured under the measurement conditions shown in Table 2.

(3) Measurement of coating surface roughness with a scanning probe microscope (SPM) The surface roughness of the coating surface (mean square roughness) was measured using a scanning probe microscope (Model: SPM-9700HT, manufactured by Shimadzu Corporation). ). The measurement conditions are shown in Table 3, and details of the used cantilevers are shown in Table 4.

(4) Evaluation of antifouling property In the following, the sample on which the coating film is formed is referred to as "evaluation sample".
With respect to the sample for evaluation, the visible light (400 to 700 nm) transmittance (transmittance before dropping muddy water) was measured.
Thereafter, the sample for evaluation was placed in a state where the surface of the coating film was inclined 5 ° with respect to a horizontal plane with the surface of the coating film facing upward, and muddy water was dropped on the surface of the coating film, and held in that state for 30 seconds. Thereafter, the visible light transmittance (transmittance after dripping muddy water) of the sample for evaluation after dripping muddy water was measured.
The above visible light transmittance measurement was performed using an ultraviolet-visible spectrophotometer (UV-vis: UV-2600 manufactured by Shimadzu Corporation) with a measurement wavelength range of 400 to 700 nm and a scan speed of medium.
It can be judged that the smaller the value of the transmittance difference before and after the muddy water dripping (permeability before muddy water dripping-transmittance after muddy water dripping) is, the higher the antifouling property of the coating surface.

From the values of the transmittance difference before and after the muddy water dropping shown in Tables 5 and 6, it can be confirmed that the coating formed in the example is superior in antifouling property as compared with the coating formed in the comparative example. As shown in Tables 5 and 6, the films formed in the examples all have a contact angle hysteresis of 10.0 ° or less, and the contact angle hysteresis is smaller than that of the film formed in the comparative example. This is considered to be the reason why the coating film formed in the example is superior in antifouling property as compared with the coating film formed in the comparative example.
Furthermore, it can be confirmed that the coating formed in the examples has a high static contact angle with water and excellent water repellency.
As described above, the coatings formed in the examples shown in Tables 5 and 6 are antifouling coatings having excellent antifouling properties, and were also coatings that can function as water-repellent coatings.
Moreover, from the film thickness and roughness of the film shown in Tables 5 and 6, it can also be confirmed that the film formed in the examples shown in Tables 5 and 6 is a monomolecular film of an alkoxysilane compound.

All the coatings formed in the examples shown in Table 7 had a contact angle hysteresis of 10.0 ° or less. The coatings formed in the examples shown in Tables 5 and 6 showed excellent antifouling properties with a contact angle hysteresis of 10.0 ° or less. It can be said that it is excellent in dirtiness. That is, the film formed in the examples shown in Table 7 is an antifouling film having excellent antifouling properties, and can also function as a water-repellent film.
Moreover, from the film thickness and roughness of the film shown in Table 7, it can also be confirmed that the film formed in the examples shown in Table 7 is a monomolecular film of an alkoxysilane compound.

The films formed in Example 3-1 to Example 3-5 shown in Table 7 are similarly formed except that the type of the second alkoxysilane compound is changed. Since the film formed in Example 3-1 to Example 3-4 had a smaller contact angle hysteresis than the film formed in Example 3-5, the first alkoxysilane compound and From the viewpoint of imparting better antifouling properties to the article surface, it is considered that the difference in n in general formula 1 with the second alkoxysilane compound is more preferably 3 or more.

Finally, the above aspects will be summarized.

According to one aspect, there is provided a film forming composition comprising two or more alkoxysilane compounds represented by the above general formula 1, wherein the two or more alkoxysilane compounds have different n in the general formula 1. .

According to the composition for forming a film, by using this composition to form a film on the outermost layer of the article, excellent antifouling property can be provided on the surface of the article.

In one embodiment, the film forming composition includes an alkoxysilane compound represented by the general formula 1 in which the difference in n is 2 or more.

In one embodiment, among the two or more alkoxysilane compounds, the content of the alkoxysilane compound having the largest n is 5.0 to 95. with respect to the total content of the two or more alkoxysilane compounds. It is in the range of 0% by mass.

In one aspect, the coating composition contains two alkoxysilane compounds having different n in the general formula 1.

In one embodiment, in general formula 1, R ¹ , R ² and R ³ each independently represents an alkyl group having 1 to 3 carbon atoms.

According to another aspect, there is provided an article having a film formed from the film forming composition as an outermost layer.

The article can exhibit excellent antifouling properties by having the coating film on the outermost layer.

According to another aspect, there is provided a method for producing an article having a coating on the outermost layer, including a coating forming step using the coating forming composition.

In one aspect, the film forming step is performed by a dry film forming method.

According to another aspect, the article has a monomolecular film of an alkoxysilane compound (but does not contain a fluorine atom) as at least a part of the outermost layer, and has a contact angle hysteresis with respect to water on the surface of the outermost layer. Articles that are 10.0 degrees or less are also provided.

The article has an excellent antifouling property on the surface of the coating, so that the adhesion of dirt can be suppressed and / or the attached dirt can be easily removed.

In one embodiment, the alkoxysilane compound (but not including a fluorine atom) is a compound composed of a carbon atom, a hydrogen atom, an oxygen atom, and a silicon atom.

In one embodiment, the alkoxysilane compound (but not including a fluorine atom) is an alkoxysilane compound represented by General Formula 1.

In one embodiment, the coating film includes two or more alkoxysilane compounds represented by the general formula 1, and the two or more alkoxysilane compounds are formed from a film-forming composition having a different n in the general formula 1. The coated film.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Claims

The following general formula 1:

(In General Formula 1, R 1 , R 2 and R 3 each independently represents an alkyl group, and n represents 0 or an integer of 1 or more.)
A composition for forming a film, comprising two or more types of alkoxysilane compounds represented by formula (1), wherein the two or more types of alkoxysilane compounds differ in n in the general formula 1.
The composition for film formation of Claim 1 containing the alkoxysilane compound represented by General formula 1 whose difference of n is 2 or more.
Among the two or more types of alkoxysilane compounds, the content of the alkoxysilane compound having the largest n is 5.0 to 95.0% by mass with respect to the total content of the two or more types of alkoxysilane compounds. The composition for film formation according to claim 1 or 2, which is a range.
The film-forming composition according to any one of claims 1 to 3, comprising two alkoxysilane compounds having different n in the general formula 1.
The film-forming composition according to any one of claims 1 to 4, wherein in the general formula 1, R 1 , R 2 and R 3 each independently represents an alkyl group having 1 to 3 carbon atoms.
An article having, as an outermost layer, a film formed from the film-forming composition according to any one of claims 1 to 5.
A method for producing an article having a coating on the outermost layer, comprising a coating forming step using the coating forming composition according to any one of claims 1 to 5.
The manufacturing method according to claim 7, wherein the film forming step is performed by a dry film forming method.