Magnetic coated carrier two-component type developer and developing method
US6165663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Oct 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic coated carrier particles comprising magnetic carrier core particles each comprising a binder resin and metal oxide particles, and a coating layer surface-coating each carrier core particle. The metal oxide particles have been subjected to a surface lipophilicity-imparting treatment. The magnetic carrier core particles have a resistivity of at least 1.times.10.sup.10 ohm.cm, and the magnetic coated carrier has a resistivity of at least 1.times.10.sup.12 ohm.cm. The magnetic coated carrier has a particle size distribution such that (i) it has a number-average particle size Dn of 5-100 .mu.m, (ii) it satisfies a relationship of Dn/.sigma..gtoreq.3.5, wherein .sigma. denotes a standard deviation of number-basis particle size distribution of the carrier, and (iii) it contains at most 25% by number of particles having particle sizes of at most Dn.times.2/3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.