Magnetic iron oxide particles and magnetic toner using the same

Details Magnetic iron oxide particles and magnetic toner using the same Magnetic iron oxide particles and magnetic toner using the same

2006-12-05

2006-12-05

Le, H. Thi (Department: 1773)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C252S062560, C428S702000, C430S106200, C430S111410

Reexamination Certificate

active

07144626

ABSTRACT:
There are provided magnetic iron oxide particles having an average particle diameter (Dp50) of primary particles of 0.05 to 0.3 μm, an average particle diameter (Da50) of secondary particles of 0.055 to 0.9 μm, and a ratio of the average particle diameter (Da50) of the secondary particles to the average particle diameter (Dp50) of the secondary particles (Da50/Dp50) of 1.1 to 3.0, as well as a magnetic toner containing the magnetic iron oxide particles. The magnetic iron oxide particles of the present invention are in the form of small agglomerated particles and exhibit an excellent dispersibility, and the magnetic toner using the magnetic iron oxide particles is excellent in electrification stability.

REFERENCES:
patent: 4282302 (1981-08-01), Makino et al.
patent: 5652060 (1997-07-01), Uchida et al.
patent: 6465144 (2002-10-01), Hashimoto et al.
patent: 10-048878 (1998-02-01), None
patent: 2005-320231 (2005-11-01), None

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