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AssigneesCentral Glass Company, Limited, Nissan Motor Co., Ltd.
InventorsOsamu Takahashi, Shigeo Hamaguchi, Michitaka Otani, Yoshihiro Nishida, Ichiro Nakamura, Satoko Sugawara, Takeshi Kondo, Yoshinori Akamatsu, Yasuaki Kai
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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.
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 at least one of micro-pits and micro-projections and a second water-repellent layer, the film being prepared by a method comprising the steps of:
Dependencies are inferred from the claim text.