Patent ID: 7824833
Filing Date: 2010-11-02
Classification: G03G

Abstract:
1. A spherical resin-coated ferrite carrier for an electrophotographic developer, wherein a carrier core material thereof has an irregular surface to improve the adhesive strength to a resin coat, and wherein the irregularity of the surface takes a finely streaked wrinkle pattern, the spherical resin-coated ferrite carrier is produced by a method comprising: ferritizing, by thermal spray in air, a granulated material formed after preparation of a ferrite carrier feedstock; then quenching and solidifying the ferritized granulated material; and forming a resin coat on a surface of the resultant carrier core material, wherein a combustible gas and oxygen are used for a combustible gas flame for the thermal spray, and a volume ratio of the combustible gas and the oxygen is 1:3.5 to 6.0; the combustible gas is propane; a carrier gas of the granulated material is nitrogen, air or oxygen; and a flow rate of the granulated material is 20 to 60 m/s.