EP0513727A2
Expired / Lapsed
EP
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Water repellent glass and process for producing the same
Assignee: Toyota Motor Corp
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Filing: 1992-05-12
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Granted: —
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Expires: 2012-05-12
Abstract
Abstract The water repellent glass includes a glass substrate (1), and a water repellent film (2) coated integrally on the glass substrate (1) and including ceramics. The ceramics includes SiO₂ at least, and part of nonmetallic atoms of the ceramics are substituted with a fluoroalkyl group. Hence, the water repellent film (2) is cross-linked with the glass substrate (1) mainly by the siloxane bonds. Consequently, the water repellent film (2) is excellent in terms of the adhesion to the glass substrate (1), it is less likely to be adversely affected by the alkali components of the glass substrate (1), and it is less likely to come off. As a result, the water repellent glass comes to have an improved durability. It can be produced by coating a paint film on a glass substrate (1) with a solution, and burning the paint film. The solution includes first silicone alkoxide expressed by a chemical formula Si(OR)₄, second silicone alkoxide, part of whose alkoxyl groups are substituted with a fluoroalkyl group, alcohol, water, and acid or base.
Inventors
- 👤 Masatsugu Nakanishi
- 👤 Syoji Yokoishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:27
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C03C17/006; C03C17/008; C03C17/009; C03C17/28; C03C17/30; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/111
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
41 words
Water repellent glass, comprising: a glass substrate; and a water repellent film coated integrally on a surface of said glass substrate and including ceramics including SiO₂ at least, part of nonmetallic atoms of the ceramics being substituted with a fluoroalkyl group.
Claim 2
Dependent Claim
35 words
The water repellent glass according to claim 1, wherein said glass substrate includes at least one selected from the group consisting of silicate glass, borosilicate glass including B₂O₃ and SiO₂, and phosphate glass including P₂O₅.
Claim 3
Dependent Claim
35 words
The water repellent glass according to claim 2, wherein said silicate glass is at least one selected from the group consisting of silica glass, silica-alkali glass, lead-alkali glass, soda-lime glass, potassium-lime glass, and barium glass.
Claim 4
Dependent Claim
25 words
The water repellent glass according to claim 1, wherein said water repellent film includes said SiO₂ in an amount of 50% by mole or more.
Claim 5
Dependent Claim
28 words
The water repellent glass according to claim 1, wherein said water repellent film further includes at least one selected from the group consisting of TiO₂, Al₂O₃, and ZrO₂.
Claim 6
Dependent Claim
37 words
The water repellent glass according to claim 1, wherein said nonmetallic atoms of said ceramics are substituted with said fluoroalkyl group in an amount of less than 1.5% of a total number of all said nonmetallic atoms.
Claim 7
Dependent Claim
37 words
The water repellent glass according to claim 6, wherein said nonmetallic atoms of said ceramics are substituted with said fluoroalkyl group in an amount of 0.75% or less of a total number of all said nonmetallic atoms.
Claim 8
Dependent Claim
17 words
The water repellent glass according to claim 1, wherein said water repellent film further includes phosphorous element.
Claim 9
Dependent Claim
28 words
The water repellent glass according to claim 1, wherein a refractive index of said glass substrate is substantially equal to a refractive index of said water repellent film.
Claim 10
Dependent Claim
90 words
A process for producing water repellent glass, comprising the steps of: a solution preparing step of preparing a solution in which first silicone alkoxide expressed by a chemical formula Si(OR)₄, second silicone alkoxide, part of alkoxyl groups of the second silicone alkoxide being substituted with a fluoroalkyl group, alcohol, water, and acid or base are mixed; a coating step of coating said solution on a surface of a glass substrate, thereby forming a paint film; and a burning step of burning said paint film, thereby forming a water repellent film.
Claim 11
Dependent Claim
35 words
The process for producing water repellent glass according to claim 10, wherein said solution further includes metallic alkoxide, and oxide of metallic element of the metallic alkoxide exhibits a refractive index of 1.6 or more.
Claim 12
Dependent Claim
34 words
The process for producing water repellent glass according to claim 11, wherein said solution includes said metallic alkoxide in an amount of 50% by mole or less of an amount of said silicone alkoxide.
Claim 13
Dependent Claim
32 words
The process for producing water repellent glass according to claim 11, wherein said metallic alkoxide is at least one selected from the group consisting of titanium alkoxide, zirconium alkoxide, and aluminum alkoxide.
Claim 14
Dependent Claim
20 words
The process for producing water repellent glass according to claim 10 or 11, wherein said solution further includes phosphorous alkoxide.
Claim 15
Dependent Claim
35 words
The process for producing water repellent glass according to claim 14, wherein said solution includes said phosphorous alkoxide in an amount of 20% by mole or less of a total amount of all said alkoxides.
Claim 16
Dependent Claim
26 words
The process for producing water repellent glass according to claim 10 or 11, wherein said burning step is carried out in the presence of water vapor.
Claim 17
Dependent Claim
18 words
The process for producing water repellent glass according to claim 16, wherein said solution further includes phosphorous alkoxide.
Claim 18
Dependent Claim
26 words
The process for producing water repellent glass according to claim 10 or 11, wherein said burning step is carried out in the presence of ammonium gas.
Claim 19
Dependent Claim
18 words
The process for producing water repellent glass according to claim 18, wherein said solution further includes phosphorous alkoxide.
Claim 20
Dependent Claim
23 words
The process for producing water repellent glass according to claim 10 or 11, wherein said burning step is carried out in non-oxidizing atmosphere.
Claim 21
Dependent Claim
18 words
The process for producing water repellent glass according to claim 20, wherein said solution further includes phosphorous alkoxide.
Claim 22
Dependent Claim
27 words
The process for producing water repellent glass according to claim 20, wherein said burning step is carried out at a temperature of not more than 600 °C.
Claim 23
Dependent Claim
30 words
The process for producing water repellent glass according to claim 10 or 11, wherein said burning step is carried out in air at a temperature of 350 °C or less.
Claim 24
Dependent Claim
18 words
The process for producing water repellent glass according to claim 23, wherein said solution further includes phosphorous alkoxide.
Claim 25
Dependent Claim
45 words
The process for producing water repellent glass according to claim 10, wherein said solution includes said second silicone alkoxide in an amount of less than 3% by mole of a total amount of all said alkoxides when silicone alkoxide is employed for all said alkoxides.
Claim 26
Dependent Claim
45 words
The process for producing water repellent glass according to claim 25, wherein said solution includes said second silicone alkoxide in an amount of 1.5% by mole or less of a total amount of all said alkoxides when silicone alkoxide is employed for all said alkoxides.
References Cited (Backward Citations)
No citation records indexed.
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