Hydrophilic article and method for producing same
US6045903A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Jun 8, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/259
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.