Spherical magnetic particles for magnetic toner and process for producing the same
US5652060A · kind A · utility
16Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Spherical magnetic iron oxide particles for a magnetic toner comprise: PA1 Fe.sup.2+ -containing iron oxide particles having an average particle diameter of 0.05 to 0.30 .mu.m, PA1 containing 1.7 to 4.5 atm % of silicon, calculated as Si, based on Fe and not more than 0.35 wt % of sulfur based on the total weight of said Fe.sup.2+ -containing iron oxide particles, and PA1 having a sphericity .phi. (.phi.=l/w) of 0.8 to 1.0, and a coercive force (Hc) and the average particle diameter (d .mu.m) which satisfy the following relationship: EQU 147-322.7.times.d.ltoreq.Hc.sub.(10 kOe) .ltoreq.207-322.7.times.d.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.