Hydrophilic article and method for producing same

Details Hydrophilic article and method for producing same Hydrophilic article and method for producing same

1998-07-15

2000-06-06

Speer, Timothy M.

Stock material or miscellaneous articles

Composite

Of quartz or glass

428325, 428432, 428701, 428702, 4271631, 427165, 427168, 427169, 4273722, 4273977, 65 6052, B32B 1700

Patent

active

060716231

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.

REFERENCES:
patent: 4568578 (1986-02-01), Arfsten et al.
patent: 5413865 (1995-05-01), Nakamura
patent: 5895722 (1999-04-01), Kobayashi

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