Process for the production of coated particles
US6194069A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Jul 29, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the production of insulator-coated black particles, which comprises the steps of PA1 (1-a) dispersing particles of silica or a metal oxide in an alcohol-based solvent consisting mainly of an intermediate alcohol to obtain a dispersion of the above particles, PA1 (1-c) forming a titanium oxide coating of TiO.sub.2 on the surface of each of the particles whose surfaces have been activated in the above step, to obtain titanium oxide-coated particles, PA1 (1-d) calcining the titanium oxide-coated particles obtained in the above step in a reducing and/or nitriding atmosphere and thereby blackening the above titanium oxide coatings to obtain black particles, and PA1 (1-e) forming an electrical insulator coating on a surface of each of the black particles obtained in the above step, to obtain insulator-coated black particles; characerized in that the process includes a step of PA1 (1-b) adding an alkaline aqueous solution to the dispersion obtained instep (1-a) to activate a surface of each of the particles of a metal oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.