Hydrophilic article and method for producing same
First Claim
1. A hydrophilic article comprising:
- (a) a substrate;
(b) a first layer formed on said substrate, said first layer comprising (1) an amorphous silica and (2) at least one first amorphous metal oxide selected from the group consisting of titania and alumina; and
(c) a second layer formed on said first layer, said second layer comprising (1) a matrix phase constituted of a crystalline titania and at least one second amorphous metal oxide and (2) a dispersed phase constituted of ultrafine particles made of at least one material selected from the group consisting of silica and alumina.
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Abstract
The invention relates to a hydrophilic article having (a) a substrate; (b) a first layer formed on the substrate; and (c) a second layer formed on the first substrate. The first layer contains (1) an amorphous silica and (2) at least one first amorphous metal oxide selected from titania and alumina. The second layer has (1) a matrix phase constituted of a crystalline titania and at least one second amorphous metal oxide and (2) a dispersed phase constituted of ultrafine particles made of at least one material selected from silica and alumina. The hydrophilic article is excellent in durability, since the second layer is superior in adhesion to the first layer. The hydrophilic article can be produced by a method including steps of (a) providing a first solution containing a precursor of the amorphous silica and a precursor of the at least one first amorphous metal oxide; (b) applying the first solution to the substrate, thereby to form a first precursory layer; (c) providing a second solution containing a precursor of the crystalline titania, the ultrafine particles, and a precursor of the at least one second amorphous metal oxide; (d) applying the second solution to the first precursory layer, thereby to form a second precursory layer; and (e) baking the first and second precursory layers into the first and second layers.
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Citations
16 Claims
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1. A hydrophilic article comprising:
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(a) a substrate; (b) a first layer formed on said substrate, said first layer comprising (1) an amorphous silica and (2) at least one first amorphous metal oxide selected from the group consisting of titania and alumina; and (c) a second layer formed on said first layer, said second layer comprising (1) a matrix phase constituted of a crystalline titania and at least one second amorphous metal oxide and (2) a dispersed phase constituted of ultrafine particles made of at least one material selected from the group consisting of silica and alumina. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for producing a hydrophilic article, said hydrophilic article comprising (a) a substrate;
- (b) a first layer formed on said substrate, said first layer comprising (1) an amorphous silica and (2) at least one first amorphous metal oxide selected from the group consisting of titania and alumina; and
(c) a second layer formed on said first layer, said second layer comprising (1) a matrix phase constituted of a crystalline titania and at least one second amorphous metal oxide and (2) a dispersed phase constituted of ultrafine particles made of at least one material selected from the group consisting of silica and alumina, said method comprising steps of;(a) providing a first solution comprising a precursor of said amorphous silica and a precursor of said at least one first amorphous metal oxide; (b) applying said first solution to said substrate, thereby to form a first precursory layer; (c) providing a second solution comprising a precursor of said crystalline titania, said ultrafine particles, and a precursor of said at least one second amorphous metal oxide; (d) applying said second solution to said first precursory layer, thereby to form a second precursory layer; and (e) baking said first and second precursory layers into said first and second layers. - View Dependent Claims (12, 13, 14, 15, 16)
- (b) a first layer formed on said substrate, said first layer comprising (1) an amorphous silica and (2) at least one first amorphous metal oxide selected from the group consisting of titania and alumina; and
Specification