Method for producing core material of electrophotographic...

Details Method for producing core material of electrophotographic... Method for producing core material of electrophotographic...

2011-03-01

2011-03-01

Le, Hoa V (Department: 1721)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Process of making developer composition

C430S137130

Reexamination Certificate

active

07897317

ABSTRACT:
The present invention provides a method for producing a core material of an electrophotographic ferrite carrier, by charging a raw powder with an average particle size of 20 to 50 μm obtained by preparing raw materials for ferrite into a combustion flame along with a carrier gas for the raw powder, thermal-spraying the powder in atmospheric air to ferritize the powder, subsequently rapidly solidifying the thermal-sprayed particle, and sampling and collecting the particle, wherein the method satisfies the conditions comprising the following (1) to (3): (1) a mixture gas of propane and oxygen is used for the combustion flame for the thermal spraying, and a volumetric ratio of the propane to the oxygen is 1:3.5 to 6.0; (2) the carrier gas for the raw powder is air, nitrogen, oxygen or a mixture gas thereof, and the ratio (a/b) of a charged amount (a) of a raw powder (kg/hr) to a charged amount (b) of the carrier gas (kg/hr) for the raw powder is 4.8 or less; and (3) a flame flow velocity of the combustion flame is 65 to 125 m/sec.

REFERENCES:
patent: 5419994 (1995-05-01), Honjo et al.
patent: 62-050839 (1987-03-01), None
patent: 3-233464 (1991-10-01), None
English language Abstract of JP 3-233464 A.
English language Abstract of JP 62-050839 A.

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