Claims
- 1. A method of preparing a resinous particulate carrier material useful in conjunction with a toner for preparing a two-component electrophotographic developer and consisting essentially of a core having a spherical body of magnetite surrounded by an outer surface layer comprising metallic iron and a resinous coating layer covering the core, said method comprising the steps of:
- partially reducing a particulate magnetite material in a substantially spherical form with a gaseous reducing agent to provide a layer of reduced metallic iron on the surface of said spherical magnetite material to the extent that the partial reduction is effected to such an extent that the product carrier exhibits a saturation magnetization in the range of about 90 to 150 emu/g; and coating the thus partially reduced magnetite material with a resinous material.
- 2. A method according to claim 5 wherein the partial reduction is effected to such an extent that the product carrier exhibits a saturation magnetization in the range of about 100 to about 130 emu/g.
- 3. A method according to claim 1 wherein said resinous material is applied to said reduced magnetite material in such a controlled thickness that the product carrier has an electric resistivity inperted thereto which is suitable for the particular electrophotographic developing system in which it will be employed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
60-125462 |
Jun 1985 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 871,798, filed June 9, 1986.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0058013 |
Mar 1982 |
EPX |
58-91463 |
May 1983 |
JPX |
2096176 |
Apr 1982 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Research Disclosure No. 154, Feb. 1977, pp. 36-38, Discl. No. 15439, "Electrographic Carrier Materials". |
Divisions (1)
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Number |
Date |
Country |
Parent |
871798 |
Jun 1986 |
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