Toner, image forming method, and apparatus unit
US6287739A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Jul 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09725
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner has toner particles and an external additive. The toner particles have a weight-average particle diameter of from 4 .mu.m to 9 .mu.m. The external additive has (i) first, small-particle-diameter hydrophobic fine silica particles (A) having a BET specific surface area of from 100 m.sup.2 /g to 350 m.sup.2 /g, having been treated with a silane, (ii) second, large-particle-diameter hydrophobic fine silica particles (B) having a BET specific surface area of from 15 m.sup.2 /g to 80 m.sup.2 /g, having been treated with a silicone oil, and (iii) fine alumina particles (C) having a BET specific surface area of from 50 m.sup.2 /g to 150 m.sup.2 /g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.