Electrophotographic toner, electrophotographic developer and process for forming image
US6613491B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2001 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Dec 6, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09716
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an electrophotographic developer and a process for forming an image, an electrophotographic toner used therein contains spherical toner parent particles and two or more kinds of inorganic particles having different average particle diameters, at least one kind of the inorganic fine particles being spherical particles having an average primary particle diameter of about 80 to 300 nm, and the inorganic particles containing the spherical particles being attached to the toner parent particles to provide a structure satisfying the following conditions (1) and (2):(1) the spherical particles have a coverage on a surface of the toner parent particles of about 20% or more; and(2) a proportion of the inorganic particles that are separated from the toner parent particles upon dispersing the toner in an aqueous solution is about 35% or less of a total addition amount of the inorganic particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.