Multilayered water-repellent film and method of forming same on glass substrate
First Claim
1. A combination of a glass substrate and a multilayered water-repellent film formed on the glass substrate, the film having a first metal oxide layer having a minutely rough surface having on the surface micro-pits and/or micro-projections and a second water-repellent layer, the film being prepared by:
- (a) forming the first metal oxide layer on the glass substrate such that the first metal oxide layer has a minutely rough surface having on the surface micro-pits and/or micro-projections;
(b) preparing a coating mixture comprising 0.10-20 wt % of a fluoroalkylsilane, 0.10-2 wt % of tin oxide particles doped with antimony oxide, 0.10-2 wt % of a silicon compound, water and an organic solvent;
(c) applying the coating mixture to the first metal oxide layer so as to form the second layer on the first layer; and
(d) heating the second layer at a temperature ranging from 100°
to 300°
C.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a multilayered water-repellent film formed on a glass substrate by the sol-gel process. The film has a first metal oxide layer which is formed on the glass substrate by the sol-gel process and a second water-repellent layer formed on the first layer. As a first method for providing the film with superior durability of water repellency, mechanical strength and chemical resistance, the first layer is prepared by using a mixture of three specific sols which are respectively prepared from metal alkoxides or metal acetylacetonates. As a second method for providing the film with the above advantages, the second layer is prepared by using a coating mixture comprising a fluoroalkylsilane, tin oxide particles doped with antimony oxide, a silicon compound, water and an organic solvent. As a third method for providing the film with the above advantages, the second layer is prepared by using another coating mixture comprising a fluoroalkylsilane, tin oxide particles doped with antimony oxide, a silicon compound, water, an organic solvent and an acid.
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Citations
12 Claims
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1. A combination of a glass substrate and a multilayered water-repellent film formed on the glass substrate, the film having a first metal oxide layer having a minutely rough surface having on the surface micro-pits and/or micro-projections and a second water-repellent layer, the film being prepared by:
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(a) forming the first metal oxide layer on the glass substrate such that the first metal oxide layer has a minutely rough surface having on the surface micro-pits and/or micro-projections; (b) preparing a coating mixture comprising 0.10-20 wt % of a fluoroalkylsilane, 0.10-2 wt % of tin oxide particles doped with antimony oxide, 0.10-2 wt % of a silicon compound, water and an organic solvent; (c) applying the coating mixture to the first metal oxide layer so as to form the second layer on the first layer; and (d) heating the second layer at a temperature ranging from 100°
to 300°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A combination of a glass substrate and a multilayered water-repellent film formed on a glass substrate, the film having a first metal oxide layer having a minutely rough surface having on the surface micro-pits and/or micro-projections and a second water-repellent layer, the film being prepared by:
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(a) forming the first metal oxide layer on the glass substrate such that the first metal oxide layer has a minutely rough surface having on the surface micro-pits and/or micro-projections; (b) preparing a coating mixture comprising 0.10-20 wt % of a fluoroalkylsilane, 0.04-2 wt % of tin oxide particles doped with antimony oxide, 0.03-2 wt % of a silicon compound, 0.005-15 wt % of water, an organic solvent and an acid, the molar ratio of the acid to the fluoroalkylsilane being in a range from 5.0×
10-4 ;
1 to 2.0×
10-2 ;
1;(c) applying the coating mixture to the first metal oxide layer so as to form the second layer on the first layer; and (d) heating the second layer at a temperature ranging from 100°
to 400°
C. - View Dependent Claims (9, 10, 11, 12)
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Specification