Ferrite carrier core material for electrophotographic developer, ferrite carrier, manufacturing method thereof, and electrophotographic developer using said ferrite
US11422480B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2018 |
| Grant date | Aug 23, 2022 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1137
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides: a ferrite carrier core material for an electrophotographic developer, the material having a mesh passing amount of 3 wt % or less as indicated by the ratio of the weight of particles passing through a 16 μm-mesh to the weight of whole particles constituting a powder, and having a particle strength index of 2 wt % or less as indicated by a difference between the mesh passing amounts before and after crushing; a ferrite carrier which is for an electrophotographic developer and in which the surface of the ferrite carrier core material is coated with a resin; and an electrophotographic developer which includes the ferrite carrier and a toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.