G - Physics – 03 – G
Patent
G - Physics
03
G
G03G 9/083 (2006.01) C09C 1/24 (2006.01)
Patent
CA 2305042
Black magnetic iron oxide particles of the present invention having an average particle diameter of 0.1 to 0.3 µm, comprise: black spinel iron oxide particles as core particles; and a surface coat formed on the surface of each core particle, comprising fine spinel iron oxide particles, the content of Fe0 in a surface layer having a thickness of from a surface of each black magnetic iron oxide particle to about 3.5 % per a radius of each black magnetic iron oxide particle, being 8 to 14 % by weight based on the weight of Fe contained in said surface layer. Such black magnetic iron oxide particles not only have a sufficient blackness and excellent electrical properties, flowability and electrification property (charging property), but also exhibit a good compatibility with binder resins such as aromatic vinyl-based resins, acrylic-based resins and copolymer resins thereof, and a good dispersibility in these resins for a magnetic toner.
Aoki Koso
Kozawa Minoru
Misawa Hiromitsu
Miura Suehiko
Shimo Nobuya
Goudreau Gage Dubuc
Toda Kogyo Corporation
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