Method for producing zirconia colloids
US9250360B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 9, 2014 |
| Grant date | Feb 2, 2016 |
| Priority date | — |
| Expiry date | Mar 28, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention pertains to a method for producing a colloidal suspension of zirconia particles, including successively subjecting a mixture of zirconium oxychloride and an alkali metal halide in an aqueous solvent to hydrothermal treatment at a temperature above 150° C, separating the slurry obtained from the supernatant, and peptizing said slurry by adding a strong acid thereto, and desalting said slurry, for example by ultrafiltration, so as to form a colloidal suspension of zirconia. The present invention also pertains to the transparent colloidal suspension obtainable by this method, and to an optical article, such as an ophthalmic lens, comprising a transparent polymer substrate and at least one coating prepared from a composition comprising said colloidal suspension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.