Magnetic toner and image forming method
US5618647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Aug 28, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0821
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic toner has magnetic toner particles containing a binder resin and a magnetic material, and an inorganic fine powder treated with an organic compound. The magnetic toner has a volume average particle diameter D.sub.v (.mu.m) of 3 .mu.m.ltoreq.D.sub.v <6 .mu.m, a weight average particle diameter D.sub.4 (.mu.m) of 3.5 .mu.m.ltoreq.D.sub.4 <6.5 .mu.m, a percentage M.sub.r of particles with particle diameters of 5 .mu.m or smaller in number particle size distribution of the magnetic toner, of 60% by number<M.sub.r .ltoreq.90% by number, and the ratio of a percentage N.sub.r of particles with particle diameters of 3.17 .mu.m or smaller in number particle size distribution of the magnetic toner to a percentage N.sub.v of particles with particle diameters of 3.17 .mu.m or smaller in volume particle size distribution of the magnetic toner, N.sub.r /N.sub.v, of from 2.0 to 8.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.