US5250322A
Expired / Lapsed
US
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Water-repellent metal oxide film coated on glass substrate and method of forming same
Assignee: Central Glass Co Ltd
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Filing: 1992-12-16
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Granted: 1993-10-05
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Expires: 2012-12-16
Abstract
Abstract The disclosure relates to a metal oxide film formed on a glass substrate by the so-gel process with using a solution of a metal alkoxide. To afford water repellency to the oxide film, a fluoroalkylsilane is mixed with an alkoxysilane solution in the molar ratio of the alkoxysilane to the fluoroalkylsilane ranging from 1:10 to 10:1. Then, the mixed solution is diluted with a solvent such that the total concentration of the alkoxysilane and the fluoroalkylsilane is from 1 to 10 wt % in a diluted solution. Then, water in the amount of 100 mol % to 1000 mol % of the total amounts of the fluoroalkylsilane and the alkoxysilane is added to the diluted solution so as to partially hydrolyze the fluoroalkylsilane and the alkoxysilane, thereby forming a sol. Then, the sol is applied to the glass substrate, and the coated glass substrate is heated so as to form the metal oxide film thereon.
Inventors
- 👤 Osamu Takahashi
- 👤 Hiroaki Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:09
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/30; C03C17/006; C03C17/008; C03C17/009; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
A method of forming a water-repellent metal oxide film on a glass substrate, the method comprising the steps of: mixing an alkoxysilane with a fluoroalkylsilane in the molar ratio of said alkoxysilane to said fluoroalkylsilane ranging from 1:10 to 10:1 so as to form a mixed solution; diluting the mixed solution with a solvent such that the total concentration of said alkoxysilane and said fluoroalkylsilane is from 1 to 10 wt % in a diluted solution; adding water in the amount of 100 mol % to 1000 mol % of the total amounts of said fluoroalkylsilane and said alkoxysilane to the diluted solution so as to partially hydrolyze said fluoroalkylsilane and said alkoxysilane, thereby forming a sol; applying the sol to the glass substrate, thereby to form a gel film on the glass substrate; and heating the gel film so as to form the metal oxide film on the glass substrate.
Claim 2
Independent Claim
151 words
A method of forming a water-repellent metal oxide film on a glass substrate, the method comprising the steps of: mixing an alkoxysilane with a fluoroalkylsilane in the molar ratio of said alkoxysilane to said fluoroalkylsilane ranging from 1:10 to 10:1 so as to form a mixed solution; diluting the mixed solution with a solvent such that the total concentration of said alkoxysilane and said fluoroalkylsilane is from 1 to 10 wt % in a diluted solution; adding water in the amount of 100 mol % to 1000 mol % of the total amounts of said fluoroalkylsilane and said alkoxysilane to the diluted solution so as to partially hydrolyze said fluoroalkylsilane and said alkoxysilane, thereby forming a sol; applying the sol to the glass substrate, thereby to form a gel film on the glass substrate; and heating the gel film so as to form the metal oxide film on the glass substrate.
Claim 3
Dependent Claim
29 words
A method according to claim 1, wherein said alkoxysilane is mixed with said fluoroalkylsilane in the molar ratio of said alkoxysilane to said fluoroalkylsilane ranging from 2:1 to 8:1.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein the gel film is heated at a temperature ranging from 100° to 400° C.
Claim 5
Dependent Claim
30 words
A method according to claim 1, wherein the metal oxide film formed on the glass substrate has a thickness ranging from a thickness of a monomolecular film to 5 nm.
Claim 6
Dependent Claim
15 words
A method according to claim 1, further comprising adding nitric acid to the diluted solution.
Claim 7
Dependent Claim
20 words
A method according to claim 1, wherein the sol is applied to the glass substrate by hand with a brush.
Claim 8
Dependent Claim
125 words
A method according to claim 1, wherein said fluoroalkylsilane compound is selected from the group consisting of CF 3 (CH 2 ) 2 Si(OCH 3 ) 3 , CF 3 (CH 2 ) 2 SiCl 3 , CF 3 (CF 2 ) 5 (CH 2 ) 2 Si(OCH 3 ) 3 , CF 3 (CF 2 ) 5 (CH 2 ) 2 SiCl 3 , CF 3 (CF 2 ) 7 (CH 2 ) 2 Si(OCH 3 ) 3 , CF 3 (CF 2 ) 7 (CH 2 ) 2 SiCl 3 , CF 3 (CF 2 ) 7 (CH 2 ) 2 SiCH 3 Cl 2 and CF 3 (CF 2 ) 7 (CH 2 ) 2 SiCH 3 (OCH 3 ) 2 .
Claim 9
Dependent Claim
40 words
A method according to claim 1, wherein said alkoxysilane is selected from the group consisting of Si(OC 2 H 5 )4, Si(OCH 3 ) 4 , CH 3 Si(OCH 3 ) 3 and Si(OC 3 H 7 ) 4 .
Claim 10
Dependent Claim
21 words
A method according to claim 1, wherein said solvent is selected from the group consisting of lower alcohols and aromatic hydrocarbons.
Claim 11
Dependent Claim
22 words
A water-repellent metal oxide film coated on a glass substrate, the film being formed in accordance with the method of claim 1.
Claim 12
Dependent Claim
123 words
A repellent to be applied to a glass substrate, the repellent being prepared in accordance with a method, the method comprising the steps of: mixing an alkoxysilane with a fluoroalkylsilane in the molar ratio of said alkoxysilane to said fluoroalkylsilane ranging from 1:10 to 10:1 so as to form a mixed solution; diluting the mixed solution with a solvent such that the total concentration of said alkoxysilane and said fluoroalkylsilane is from 1 to 10 wt % in a diluted solution; and adding water in the amount of 100 mol % to 1000 mol % of the total amounts of said fluoroalkylsilane and said alkoxysilane to the diluted solution so as to partially hydrolyze said fluoroalkylsilane and said alkoxysilane, thereby forming a sol.
Claim 13
Dependent Claim
123 words
A repellent to be applied to a glass substrate, the repellent being prepared in accordance with a method, the method comprising the steps of: mixing an alkoxysilane with a fluoroalkylsilane in the molar ratio of said alkoxysilane to said fluoroalkylsilane ranging from 1:10 to 10:1 so as to form a mixed solution; diluting the mixed solution with a solvent such that the total concentration of said alkoxysilane and said fluoroalkylsilane is from 1 to 10 wt % in a diluted solution; and adding water in the amount of 100 mol % to 1000 mol % of the total amounts of said fluoroalkylsilane and said alkoxysilane to the diluted solution so as to partially hydrolyze said fluoroalkylsilane and said alkoxysilane, thereby forming a sol.
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