Hydrophilic article and method for producing same
First Claim
1. A hydrophilic article comprising:
- (a) a substrate; and
(b) a hydrophilic film formed on said substrate, said film having a hydrophilic outermost layer, said outermost layer comprising;
(1) a titania;
(2) an amorphous oxide in an amount of from 5 to 25 wt % based on a total weight of said outermost layer; and
(3) silica particles having a particle diameter of from 3 to 20 nm.
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Abstract
The invention relates to a hydrophilic article having (a) a substrate; and (b) a hydrophilic film formed on the substrate. This film has a hydrophilic outermost layer containing (1) a titania; (2) an amorphous oxide in an amount of from 5 to 25 wt % based on the total weight of the outermost layer; and (3) silica particles having a particle diameter of from 3 to 20 nm. A combination of the titania and the amorphous oxide constitutes the hydrophilic outermost layer'"'"'s matrix phase (continuous phase), and the silica particles constitute the disperse phase distributed over the matrix phase. The hydrophilic outermost layer is superior in abrasion resistance and duration of hydrophilicity. The hydrophilic article is produced by a method including sequential steps of (a) providing a sol mixture comprising a first sol containing a precursor of the titania, a second sol containing a precursor of the amorphous oxide, and a silica colloidal solution containing the silica particles; (b) applying the sol mixture to the substrate, thereby to form thereon a precursory film; and (c) baking the precursory film into the outermost layer.
27 Citations
21 Claims
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1. A hydrophilic article comprising:
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(a) a substrate; and (b) a hydrophilic film formed on said substrate, said film having a hydrophilic outermost layer, said outermost layer comprising; (1) a titania; (2) an amorphous oxide in an amount of from 5 to 25 wt % based on a total weight of said outermost layer; and (3) silica particles having a particle diameter of from 3 to 20 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for producing a hydrophilic article having a substrate coated with a hydrophilic film, said hydrophilic film having a hydrophilic outermost layer comprising a titania, an amorphous oxide, and silica particles, said method comprising sequential steps of:
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(a) providing a sol mixture comprising a first sol containing a precursor of said titania, a second sol containing a precursor of said amorphous oxide, and a silica colloidal solution containing said silica particles; (b) applying said sol mixture to said substrate, thereby to form thereon a precursory film; and (c) baking said precursory film into said outermost layer. - View Dependent Claims (19)
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20. A method for producing a hydrophilic article, said hydrophilic article having a substrate, a hydrophilic outermost layer formed on said substrate, and an interlayer interposed between said substrate and said hydrophilic outermost layer, said hydrophilic outermost layer comprising a titania, an amorphous oxide, and silica particles, said method comprising steps of:
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(a) applying a sol containing a silica precursor to said substrate, thereby to form thereon a first precursory film; (b) drying said first precursory film into said interlayer made of a silica; (c) providing a sol mixture comprising a first sol containing a precursor of said titania, a second sol containing a precursor of said amorphous oxide, and a silica colloidal solution containing said silica particles; (d) applying said sol mixture to said interlayer, thereby to produce a first precursor of said hydrophilic article; (e) preliminarily baking said first precursor at a first temperature into a second precursor of said hydrophilic article; and (f) bending said second precursor into said hydrophilic article, while said second precursor is baked at a second temperature that enables said bending of said second precursor. - View Dependent Claims (21)
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Specification