KR20170012412A - Agent for forming adhesive coating for aluminum oxide or aluminum substrate - Google Patents

Abstract

An adhesion film-forming agent for an aluminum oxide or aluminum substrate, which can be formed by a wet coating method.
A hydrolysis / condensation product of an alkoxysilane component containing at least one member selected from the group consisting of alkoxysilanes represented by the following formulas (I) and (II), and an adhesion film-forming agent .
(Formula 1)
Si (OR < ¹ >) ₄ (I)
(2)
R ² _m Si (OR ³ ) _4-m (II)
R ¹ and R ³ each independently represent an alkyl group of 1 to 5 carbon atoms, R ² represents a hydrogen atom or the like, and m represents an integer of 1 to 3.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating film forming agent for an aluminum oxide or aluminum substrate,

The present invention relates to an adhesion film-forming agent for aluminum oxide or aluminum substrate such as sapphire glass.

Sapphire glass is a single crystal of aluminum oxide, which is very hard and transparent, strong in heat, and excellent in properties that it is insoluble in chemicals. Sapphire glass is used for a cover glass of a watch (windshield), a cover glass of a camera lens, and a touch panel substrate of a smart phone or a tablet from the feature that the hardness is high and scratches are not easy.

A technique of applying an antifouling agent such as a fluorine-based compound or a silicon-based compound to the surface of a member such as a glass is known in order to improve scratch resistance, which is a property in which scratches do not easily occur when rubbing other materials on the substrate. When the antifouling agent is applied, the slipperiness of the surface becomes good, and even if the impact is applied, the impact can be alleviated by the slippery property, and excellent scratch resistance can be obtained. In addition, the application of the antifouling agent provides the effect that the water repellency, the oil repellency, and the fingerprint are not easily adhered.

When the antifouling agent is applied to the sapphire glass, it is expected that the antiscratchability is remarkably improved by the high hardness of the sapphire glass and the sliding effect of the antifouling layer. However, aluminum oxide such as sapphire glass generally has poor adhesion to an antifouling agent, and anticipated scratch resistance is not obtained. In order to avoid this problem, a method of forming an adhesion-assisting layer of aluminum oxide (Al ₂ O ₃ ) and silicon dioxide (SiO ₂ ) by a dry coating method under vacuum has been reported (Patent Document 1).

Further, a technique has been reported in which silicon oxide (SiO ₂ ) and silicon nitride (SiN x) are formed by sputtering on sapphire glass, and thereafter a film of a scattering layer is formed (Patent Document 2). Film formation by a dry coating method such as sputtering, PVD (Physical Vapor Deposition), or CVD (Chemical Vapor Deposition) is carried out in a vacuum container, and an expensive large-scale apparatus is required. In addition, there is also a problem that the size and shape of the substrate that can be formed are limited.

On the other hand, film formation by a wet coating method such as flexo printing, spin coat, ink jet, slit coat, bar coat, spray and the like can form a film at low cost and at a high speed. However, a wet coating method capable of sufficiently bonding with aluminum oxide is not known, and it is necessary to form a film by the dry coating method at a high cost in order to apply the antifouling agent.

U.S. Patent Publication No. 2014/0087197 A1 Japanese Patent Publication No. 5435168

It is an object of the present invention to provide an aluminum oxide or aluminum substrate such as sapphire glass which is capable of forming a functional film such as an antifouling agent, Or an adhesion film-forming agent for an aluminum substrate.

Means for Solving the Problems As a result of intensive research to achieve the above object, the present inventors have completed the present invention having the following points.

1. An adhesion film-forming agent for an aluminum oxide or aluminum substrate, which comprises a hydrolysis / condensation product of an alkoxysilane and an aluminum salt.

2. The hydrolysis-condensation product of an alkoxysilane is a hydrolysis-condensation product of an alkoxysilane component containing at least one selected from alkoxysilanes represented by the following formulas (I) and (II) My.

(Formula 1)

Si (OR < ¹ >) ₄ (I)

(2)

R ² _m Si (OR ³ ) _4-m (II)

In the formulas (I) and (II), R ¹ and R ³ each independently represent an alkyl group having 1 to 5 carbon atoms, and R ² represents a halogen atom, a vinyl group, a methacryloxy group, , A phenyl group, and a cyclohexyl group, and may be substituted with at least one selected from the group consisting of a hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, a halogen atom, a vinyl group, a methacryloxy group , An acryloxy group, a styryl group, a phenyl group, a cyclohexyl group, an amino group, a glycidoxy group, a mercapto group, an isocyanate group or a ureide group. m represents an integer of 1 to 3;

Wherein the aluminum salt is at least one selected from the group consisting of aluminum chloride, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum oxalate, aluminum sulphamate, aluminum sulphonate, aluminum acetoacetate, aluminum acetylacetonate and their basic salts The adhesion film-forming agent according to the above 1 or 2,

4. The adhesion film-forming agent according to any one of items 1 to 3, wherein the aluminum salt is an aluminum nitrate salt.

5. The catalyst according to any one of the above 1 to 4, wherein the molar ratio of aluminum atoms (Al / (Si + Al)) to the sum of the total number of moles of silicon atoms (Si) And the adhesion film-forming agent described above.

6. A process for producing an anti-precipitation agent, which comprises at least one compound selected from the group consisting of N-methyl-pyrrolidone, ethylene glycol, dimethylformamide, dimethylacetamide, diethylene glycol, propylene glycol, hexylene glycol, , And the adhesion film-forming agent according to any one of 1 to 5 above.

7. A film obtained by using the adhesion film-forming agent according to any one of 1 to 6 above.

8. An aluminum oxide or aluminum substrate having the adhesion film as described in 7 above.

9. A touch panel having the contact coating as described in 7 above.

10. A method for forming a coating film for an aluminum oxide or aluminum substrate, wherein the coating film formed by coating the adhesion film-forming agent described in any one of the above 1 to 6 on an aluminum oxide substrate or an aluminum substrate is fired at 100 to 600 占 폚.

The adhesion film-forming agent of the present invention can be applied to aluminum oxide or an aluminum substrate such as sapphire glass by coating or the like to form a coating film and a functional film such as an antifouling agent is formed thereon to impart properties such as excellent scratch resistance have. For example, according to the present invention, a cover glass for a touch panel having excellent antifouling property and scratch resistance can be obtained. Since the surface of the metallic aluminum is oxidized in the air to form an aluminum oxide film, the close-film forming agent of the present invention can also be used for a metallic aluminum substrate.

1 is a schematic cross-sectional view of a cover glass for a touch panel, which is a representative example of an aluminum oxide substrate obtained using the adhesion film-forming agent of the present invention.

The adhesion film-forming agent of the present invention contains a hydrolysis / condensation product of alkoxysilane as component (A) and an aluminum salt as component (B).

≪ Component (A) >

The hydrolysis / condensation product of the alkoxysilane as the component (A) is a hydrolysis / condensation product of an alkoxysilane component containing at least one selected from the alkoxysilanes represented by the following formulas (I) and (II).

(Formula 3)

Si (OR < ¹ >) ₄ (I)

R ¹ represents an alkyl group having 1 to 5 carbon atoms. From the viewpoint of reactivity, the OR ¹ group is preferably a methoxy group, an ethoxy group or a propoxy group.

Specific examples of the alkoxysilane represented by the formula (I) include, but are not limited to, For example, tetramethoxysilane, tetraethoxysilane, tetra-iso-propoxysilane, tetra-n-propoxysilane, tetra-n-butoxysilane, tetra- Butoxysilane, tetrapentaethoxysilane, and the like.

In the alkoxysilane represented by the formula (I), when 40 mol% or less of the total alkoxysilane is not sufficient hardness is obtained in some cases, it is preferably 40 mol% or more. More preferably, it is at least 50 mol%. More preferably, it is at least 80 mol%.

(Formula 4)

R ² _m Si (OR ³ ) _4-m (II)

R ² may be substituted with at least one member selected from the group consisting of a halogen atom, a vinyl group, a methacryloxy group, an acryloxy group, a styryl group, a phenyl group, and a cyclohexyl group, A halogen atom, a vinyl group, a methacryloxy group, an acryloxy group, a styryl group, a phenyl group, a cyclohexyl group, an amino group, a glycidoxy group, a mercapto group, an isocyanate group or a ureide Lt; / RTI > When R ¹ , R ² and R ³ are plural, R ¹ , R ² and R ³ each independently have the above definition.

R ³ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 3. When R ³ is plural, R ³ independently represents the above-mentioned definition. From the viewpoint of reactivity, the OR ³ group is preferably a methoxy group or an ethoxy group.

Specific examples of the alkoxysilane represented by the formula (II) include, but are not limited to, For example, there may be mentioned 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, methacryloxymethyltrimethoxysilane, methacryloxymethyltriethoxysilane, 3-acryloxypropyl tri Acryloxyethyltrimethoxysilane, acryloxyethyltriethoxysilane, styrylethyltrimethoxysilane, styrylethyltriethoxysilane, 3- (N (meth) acryloxypropyltriethoxysilane, 2-aminoethylamino) propyltrimethoxysilane, 4- (trimethoxysilyl) styrene, vinyltrimethoxysilane, vinyltriethoxysilane, 3,3,3-trifluoropropyltri Methoxysilane, 3-chloropropyltriethoxysilane, 3-bromopropyltriethoxysilane, dimethyldiethoxysilane, dimethyldimethoxysilane, diethyldiethoxysilane, diethyldimethoxysilane, diphenyldimethoxysilane , Diphenyldiethoxysilane trimethylethoxysilane, tri Aminoethylaminomethyltrimethoxysilane, 2- (2-aminoethylaminopropyl) trimethoxysilane, 3- (2-aminoethylaminopropyl) 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3 (glycidoxypropyltrimethoxysilane), 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-mercaptopropyltriethoxysilane, mercaptomethyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3- glycidoxypropyltriethoxysilane, 3- 3-aminopropyldimethylethoxysilane, γ-ureidopropyltriethoxysilane, γ-ureidopropyltrimethoxysilane, γ-ureido, mercaptoethyltrimethoxysilane, Propyltripropoxysilane, and the like.

The hydrolysis / condensation product of the alkoxysilane contained in the adhesion film-forming agent of the present invention is preferably not more than 5 carbon atoms, more preferably 2 to 4 carbon atoms, from the viewpoints of storage stability and hardness at low temperature baking.

The hydrolysis / condensation product of the alkoxysilane can be condensed in the presence of a base and water. The amount of the base present is preferably from 0.01 times to 2 times by mole, more preferably from 0.05 times to 1 time by mole, based on the alkoxysilane. The amount of water present is preferably from 0.5 times to 10 times by mole, more preferably from 1 time by mole to 5 times by mole, based on the alkoxysilane.

≪ Component (B) >

Examples of aluminum salts contained in the adhesion film forming agent of the present invention include aluminum chloride, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum oxalate, aluminum sulfamate, aluminum sulfonate, aluminum acetoacetate, aluminum acetylacetonate, Hydrobromide, or basic salt.

Among them, aluminum nitrate is particularly preferable from the viewpoints of availability and storage stability of the film-forming agent.

<Precipitation inhibitor>

The adhesion film-forming agent of the present invention preferably contains a precipitation inhibitor from the viewpoint of storage stability. The precipitation inhibitor is used to prevent the aluminum salt from precipitating in the coating film when the coating film is formed with the adhesion film-forming agent of the present invention.

Examples of the precipitation inhibitor include N-methyl-pyrrolidone, ethylene glycol, dimethylformamide, dimethylacetamide, diethylene glycol, propylene glycol, hexylene glycol and derivatives thereof, Or more.

<Organic solvent>

The adhesion film-forming agent of the present invention usually contains an organic solvent which dissolves or disperses the components (A) and (B). It is preferable that the organic solvent forms a coating film of the adhesion film-forming agent, and when the coating film is heat-treated to obtain the adhesion film, the organic solvent is not dispersed and remains in the formed adhesion film. For this reason, it is preferable that the organic solvent is such that the component (A) and the component (B) are dissolved or dispersed well and the boiling point is preferably 60 to 250 ° C, more preferably 75 to 200 ° C.

Examples of the organic solvent include alcohols such as methanol, ethanol, propanol and butanol, esters such as ethyl acetate, glycols such as ethylene glycol and its ether derivatives, ester derivatives, ethers such as diethyl ether, Ketones such as methyl ethyl ketone and cyclohexanone, and aromatic hydrocarbons such as benzene and toluene. Among them, ethanol, propanol, or propylene glycol monomethyl ether is preferable from the viewpoints of the residual property of solvent and applicability.

&Lt; Other components >

The adhesive film-forming agent of the present invention may contain other components, for example, inorganic microfine particles, metaloxomonomer, metaloxyl oligomer, metaloxane polymer, crosslinking agent, organic polymer, A leveling agent, a surfactant, and the like may be included.

&Lt; Preparation of adhesion film forming agent >

The adhesion film-forming agent of the present invention is characterized by comprising at least one kind selected from the alkoxysilanes represented by the formulas (I) and (II) as the component (A), the aluminum salt as the component (B) &Lt; / RTI &gt; The alkoxysilanes represented by the formulas (I) and (II) are hydrolyzed and condensed by contact with water and converted into hydrolysis / condensation products. Thus, the adhesion film-forming agent of the present invention is obtained in the form of a composition containing a hydrolysis / condensation product of an alkoxysilane and an aluminum salt dissolved or dispersed in an organic solvent.

As the organic solvent used herein, the same organic solvent as that contained in the adhesion film-forming agent of the present invention, including preferable characteristics, may be used.

With respect to the content of each component in the adhesion film-forming agent of the present invention, when the hydrolysis-condensation product of the alkoxysilane as the component (A) and the aluminum salt as the component (B) are all converted as the solid content of the metal oxide, To 20% by mass, and more preferably 0.5% by mass to 6% by mass. If the content exceeds 20 mass%, the storage stability of the composition deteriorates, and it becomes difficult to control the film thickness of the protective film to be formed. On the other hand, when the content is less than 0.1% by mass, the thickness of the obtained protective film becomes thin, and a large number of coating films are required to obtain a predetermined film thickness, which makes the production of a coherent coating difficult.

The amount of water used for hydrolysis of the alkoxysilane as component (A) is preferably 0.5 or more, more preferably 1 to 5, in terms of molar ratio (amount of water (mol)) / total mole of alkoxysilane used. When the molar ratio is 0.5 or more, the hydrolysis of the alkoxysilane described above is sufficient, so that the film-forming property is improved and the strength of the obtained adhesion film is increased.

In the above hydrolysis, when the hydrated salt of the aluminum salt as the component (B) coexists, it is necessary to incorporate the aqueous solution of the metal salt into the amount of water used for hydrolysis because the aqueous solution thereof participates in the reaction .

The hydrolysis temperature of the alkoxysilane is preferably in the range of 20 to 100 캜. Among them, from the viewpoint of obtaining a condensate having an appropriate molecular weight, it is more preferable to be in the range of 25 to 80 캜. The time for hydrolysis is preferably from 30 minutes to 48 hours, more preferably from 30 minutes to 24 hours from the viewpoint of obtaining a condensate having an appropriate molecular weight.

The precipitation inhibitor may be added when the alkoxysilane is subjected to the hydrolysis and condensation reaction in the presence of the aluminum salt, or may be added after completion of the hydrolysis and condensation reaction thereof.

The precipitation inhibitor preferably has a weight ratio of (an anti-precipitation agent / aluminum oxide) of 1 or more, more preferably 2 to 20, in terms of aluminum oxide of aluminum salt in terms of aluminum oxide. If the ratio is less than 1, the effect of preventing precipitation of the metal salt at the time of forming a coating film becomes small.

The content ratio of the hydrolysis / condensation product of the alkoxysilane as the component (A) and the aluminum salt as the component (B) contained in the adhesive film-forming agent of the present invention is such that the total molar number Si of the silicon atom and the mole number of the aluminum atom (Al / (Si + Al)) with respect to the total amount of aluminum atoms (Al) is preferably 0.1 to 0.5, more preferably 0.2 to 0.4. When the molar ratio is 0.1 or more, or 0.5 or less, the intended adhesion property can be improved.

&Lt; Adherent Coating Film &

The adhesion film-forming agent of the present invention is applied to a substrate, such as an aluminum oxide or aluminum substrate, whose surface is covered with aluminum oxide, and fired to obtain a close-contact coating on the substrate surface.

The coating film forming agent of the present invention can be used to form the coating film on the substrate surface by applying various coating methods. For example, a dip coating method, a spin coating method, a spray coating method, a brush coating method, a roll transfer method, a screen printing method, an ink jet method, and a flexo printing method can be used.

The coating film formed on the substrate surface is then heated at a temperature of, for example, 50 to 100 ° C, preferably 60 to 80 ° C to dry the coating film, and then dried at 100 ° C or higher, preferably 100 to 600 ° C, Is fired at a temperature of 300 to 600 캜 for 10 minutes or more, preferably 0.5 to 2 hours, to obtain a dense film-like adhesion film. These heat treatments can be carried out in an oven using a device such as a hot plate. It is also possible to omit the heating for drying the coating film.

As described above, a film is formed on the aluminum oxide substrate with the adhesion film forming agent of the present invention. This adhesion film can function as an adhesion-assisting layer for forming a coating agent for forming various characteristic films on its surface. For example, when an antifouling agent is used as a coating agent, an aluminum oxide substrate having an excellent scratch-resistant film on its surface can be obtained.

<Aluminum oxide substrate>

The adhesion film-forming agent of the present invention is used for forming a close-up film on the surface of an aluminum oxide or aluminum substrate. That is, a coating film is formed on the surface of an aluminum oxide substrate, and then a functional film obtained from a specific coating agent is formed on the surface of the coating film. The adhesion film is formed directly on the surface of the aluminum oxide substrate from the above-mentioned adhesion film forming agent of the present invention.

An example of the functional film is an antifouling layer. The antifouling layer can be formed by applying antifouling agent and firing. Excellent scratch resistance can be obtained by using a sapphire glass as a substrate, forming a coating film from the adhesion film forming agent of the present invention on the coating film, and subsequently forming a coating film 2 obtained from the antifouling agent.

The thicknesses of the adhesion film and the functional film are all preferably from 5 to 1000 nm, more preferably from 10 to 400 nm.

The adhesion film-forming agent of the present invention is also effective for aluminum oxide having various crystal structures. In addition to sapphire glass being monocrystalline aluminum oxide, it can be used for polycrystalline or amorphous aluminum oxide.

Further, since the surface of metal aluminum is oxidized in the air to form an aluminum oxide film, the adhesion film-forming agent of the present invention can be used also for a structure made of a metal aluminum substrate.

In the present invention, the functional film formed on the adhesion film is not particularly limited. Specific examples thereof include coatings obtained from an antifouling agent, a paint, an adhesive, an antireflection agent, a water repellent, a hydrophilic agent, a oil repellent agent, a lipophilic agent, a hard coat agent, and a repellent agent.

<Cover glass for touch panel>

As a representative example of the aluminum oxide substrate obtained using the adhesion film-forming agent of the present invention, the cover glass for a touch panel shown in Fig. 1 can be mentioned. 1 is a schematic sectional view of a cover glass for a touch panel. The cover glass for a touch panel 1 has the functional film 2 on the surface of the sapphire glass 4 with the adhesive film 3 interposed therebetween. The adhesion film 3 is a film formed directly on the surface of the sapphire glass using the adhesion film forming agent of the present invention. An example of the functional film 2 is an antifouling layer. The antifouling layer can be formed by applying antifouling agent and firing.

The antifouling agent can be kept on the sapphire glass even if the finger or the substance is rubbed by forming the adhesion film obtained from the film-forming agent of the present invention on the sapphire glass and subsequently forming the film of the antifouling agent. This makes it possible to prevent problems such as scratch resistance, water repellency, deterioration of oil repellency and fingerprints when the touch panel is used.

Example

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not construed as being limited to the following examples and the like.

[Compound and its abbreviation]

TEOS: tetraethoxysilane AN: aluminum nitrate · 9 hydrate

EtOH: Ethanol PGME: Propylene glycol monomethyl ether

HG: hexylene glycol PB: propylene glycol monobutyl ether

BCS: ethylene glycol monobutyl ether

Antifouling agent: manufactured by FT-Net, P-5425-0.2

&Lt; Example 1 >

A four necked reaction flask was charged with EtOH (22.49 g), water (7.42 g), and AN (12.88 g) and stirred. Then, EtOH (28.60 g) and TEOS (28.60 g) were added and stirred at 20 占 폚 for 1 hour to prepare a solution.

This solution (30 g) was mixed with HG (14 g), PB (10.5 g), BCS (10.5 g) and PGME (35 g) to obtain a coagulating film-forming agent.

&Lt; Example 2 >

A four necked reaction flask was charged with EtOH (22.93 g), water (6.6 g), and AN (19.62 g) and stirred. Then, EtOH (25.43 g) and TEOS (25.43 g) were added and stirred for 1 hour in a water bath to prepare a solution.

This solution (30 g) was mixed with HG (14 g), PB (10.5 g), BCS (10.5 g) and PGME (35 g) to obtain a coagulating film-forming agent.

&Lt; Comparative Example 1 &

EtOH (33.87 g) and TEOS (34.72 g) as alkoxysilane were added to a four-neck reaction flask equipped with a reflux tube and stirred. Then, EtOH (16.94 g), water (13.6 g) and an aqueous solution (0.88 g) containing 60 wt% of nitric acid were added dropwise over 30 minutes while stirring. Then, the solution was refluxed for 3 hours and then cooled to room temperature to prepare a solution.

This solution (30 g) was mixed with HG (14 g), PB (10.5 g), BCS (10.5 g) and PGME (35 g) to obtain a coagulating film-forming agent.

[Production of sapphire glass having antifouling film]

The adhesive film forming agents of Examples 1 and 2 and Comparative Example 1 described above were applied to sapphire glass (single crystal sapphire glass, surface roughness: 1 Å or less) each having a thickness of 0.7 mm using a spin coater, Lt; RTI ID = 0.0 &gt; 80 C &lt; / RTI &gt; for 3 minutes. Subsequently, the resultant was heated in a clean oven at 150 캜 or 300 캜 for 30 minutes to obtain a close coat film of Examples and Comparative Examples having a thickness of 50 to 100 nm.

Next, an antifouling agent, which is a coating agent for forming a functional film, was applied to the substrate having the adhesion film obtained in Examples and Comparative Examples using a spin coater. Thereafter, the substrate was dried on a hot plate at 80 DEG C for 3 minutes, and then heated in a clean oven at 170 DEG C for 20 minutes to manufacture a sapphire glass having an antifouling film on its surface.

In Comparative Example 2, a substrate on which an antifouling film was formed directly on a sapphire glass substrate was also produced without coating the adhesion film forming agents of Examples and Comparative Examples.

[Wear resistance evaluation: Steel wool scratch resistance test]

On the surfaces of the sapphire glass substrates produced in the above-mentioned Examples and Comparative Examples, which were held on the pedestal of a reciprocating abrasion tester (manufactured by Dai-ichi Kogyo Seiyu Co., Ltd.), steel wool Trademark: BONSTAR) was placed in contact with a square pad having an area of 2 cm &lt; 2 &gt;, and these pads were rubbed from 0 reciprocations to 1000 reciprocations at an applied load of 1,000 g and 25 reciprocations per minute. For each of 200 reciprocations of friction, the contact angle of water at a liquid amount of 3 ml was measured using a contact angle meter (DM-701 manufactured by Kyowa Interface Science Co., Ltd.). The measurement results are summarized in Table 1.

As shown in Table 1, the sapphire glass substrate with the antifouling agent of Examples 1 and 2 had a contact angle of water of 90 ° or more even when subjected to 800 reciprocating steel wool friction, a change from the initial point of less than 20 °, It was confirmed that scratch resistance was obtained.

On the other hand, in the sapphire glass substrates with antifouling agents of Comparative Examples 1 and 2, the water contact angle became less than 90 deg. By the 800 reciprocating steel wool friction and decreased by 20 deg. Or more.

Industrial availability

The aluminum oxide substrate having the antifouling film as the functional film formed through the coating film obtained from the adhesion film-forming agent of the present invention is excellent in scratch resistance and can be used as a cover glass for a clock, a cover glass for a camera lens, As a touch panel substrate of the touch panel.

The entire contents of the specification, claims, drawings and summary of Japanese Patent Application No. 2014-111610 filed on May 29, 2014 are hereby incorporated herein by reference as the disclosure of the specification of the present invention.

1: Cover glass for touch panel
2: Functional film
3:
4: sapphire glass substrate

Claims (10)

A hydrocracking / condensation product of an alkoxysilane and an aluminum salt, characterized by containing a hydrolysis / condensation product of an alkoxysilane and an aluminum salt. The method according to claim 1,
Wherein the hydrolysis / condensation product of the alkoxysilane is at least one selected from the group consisting of alkoxysilanes represented by the following formulas (I) and (II).
(Formula 1)
Si (OR &lt; ¹ &gt;) ₄ (I)
(2)
R ² _m Si (OR ³ ) _4-m (II)
In the formulas (I) and (II), R ¹ and R ³ each independently represent an alkyl group having 1 to 5 carbon atoms, and R ² represents a halogen atom, a vinyl group, a methacryloxy group, A phenyl group, a cyclohexyl group, a hydrocarbon group having 1 to 20 carbon atoms which may have a hetero atom, a hydrogen atom, a halogen atom, a vinyl group, a methacryloxy group, An acryloxy group, a styryl group, a phenyl group, a cyclohexyl group, an amino group, a glycidoxy group, a mercapto group, an isocyanate group or a ureide group. m represents an integer of 1 to 3; 3. The method according to claim 1 or 2,
Wherein the aluminum salt is at least one selected from the group consisting of aluminum chloride, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum oxalate, aluminum sulfamate, aluminum sulfonate, aluminum acetoacetate, aluminum acetylacetonate, and basic salts thereof Film forming agent. 4. The method according to any one of claims 1 to 3,
Wherein the aluminum salt is an aluminum nitrate salt. 5. The method according to any one of claims 1 to 4,
(Al / (Si + Al)) of the aluminum atom to the sum of the total number of moles of silicon atoms (Si) and the number of moles of aluminum atoms (Al) is 0.1 to 0.5. 6. The method according to any one of claims 1 to 5,
As the precipitation inhibitor, at least one compound selected from the group consisting of N-methyl-pyrrolidone, ethylene glycol, dimethylformamide, dimethylacetamide, diethylene glycol, propylene glycol, hexylene glycol and derivatives thereof Adhesive film forming agent. A coating film obtained by using the adhesion film-forming agent according to any one of claims 1 to 6. An aluminum oxide substrate or aluminum substrate having the coating film according to claim 7. A touch panel having a coating film according to claim 7. A method for forming a coherent coating film for an aluminum oxide or an aluminum substrate, wherein the coagulating film-forming agent according to any one of claims 1 to 6 is applied to an aluminum oxide substrate or an aluminum substrate and fired at 100 to 600 캜.

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