Method of making an electrophotographic toner surface treated with metal oxide
US6200722A · kind A · utility
Inventors
Key dates
| Filing date | Nov 30, 1999 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Nov 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09708
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for making an electrophotographic toner comprising: PA0 (a) uniformly mixing a metal oxide selected from titanium dioxide and silicon dioxide with toner particles to form a mixture having 5 to 15 weight percent metal oxide; PA0 (b) mixing the product of step (a) with additional toner particles at a mixing intensity .gtoreq.500,000 (cm/minute) minute; wherein in the mixed product of (b) the metal oxide is 0.1 to 5.0 weight percent of the mixed product; and the toner particles have on their surfaces a metal oxide concentration in a ratio of 1.0-3.0:1.0 with respect to titanium dioxide on the surface of the toner particles:total titanium dioxide in the mixed product; and a ratio of 10.0-25.0:1.0 with respect to silicon dioxide on the surface of the toner particles:total silicon dioxide in the mixed product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.