Toner as well as developer and image forming method using the same
US7803508B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2007 |
| Grant date | Sep 28, 2010 |
| Priority date | — |
| Expiry date | Apr 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09733
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner which combines excellent cleaning ability, image quality and durability, as well as a developer and an image forming method using the toner are provided.A toner comprising a toner base particle which comprises at least a binding resin and a colorant, and an external additive, wherein an external additive is a non-spherical amorphous silica particle and a major axis of the silica particle is 40 nm to 180 nm.An aspect wherein the non-spherical amorphous silica particle has a true specific gravity of 1.8 to 2.3 and the silica particle is hydrophobilized and a hydrophobilization degree is 40 or more, and an aspect wherein the non-spherical amorphous silica particle is produced by a dry system and a mass reduction rate is 5% by mass or less when the silica particle is heated from 30° C. up to 250° C. are preferable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.