Magnetic carrier and two-component developer
US9063443B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2013 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Oct 9, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1133
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a magnetic carrier that can stably impart charge to a toner on a long term basis and that exhibits an excellent toner separation property and thus exhibits an excellent developing performance. This magnetic carrier is a magnetic carrier in which a vinyl resin coats the surface of a resin-filled core in which a resin is filled in pores of a porous ferrite particle, wherein the resistivity, Mg content, and total content of Sr and Ca oxides of the porous ferrite particle exhibit prescribed values and the magnetic carrier has a total area—in the backscattered electron projection image obtained by observation using a scanning electron microscope at an acceleration voltage of 2.0 kV—for a region originating with the porous ferrite particle of from at least 0.2 area % to not more than 5.0 area % with reference to the projected area of the magnetic carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.