Hydrophilic article and method for producing same

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

1998-06-08

2000-04-04

Jones, Deborah

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428432, 428450, 106 13, 10628719, 427165, 4273977, B32B 516, B05D 506

Patent

active

060459034

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.

REFERENCES:
patent: 4214908 (1980-07-01), Deguchi et al.

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