JPS5522247A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5522247A JPS5522247A JP9389178A JP9389178A JPS5522247A JP S5522247 A JPS5522247 A JP S5522247A JP 9389178 A JP9389178 A JP 9389178A JP 9389178 A JP9389178 A JP 9389178A JP S5522247 A JPS5522247 A JP S5522247A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- recording medium
- magnetic
- iron oxide
- magnetic powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE: To obtain a magnetic recording medium featuring the excellent electromagnetic conversion characteristics and reduced electrification property by using the iron oxide magnetic powder containing Co and γ-Fe2O3 together in a specific ratio onto the surface of the recording medium.
CONSTITUTION: The γ-Fe2O3 powder, the iron oxide magnetic powder obtained by reducing partially the γ-Fe2O3 powder and others are diffused into the Co salt and the alkali aqueous solution of the equivalent (more than equivalent) to the Co salt and then treated at the temperature of under the boiling point. Thus the magnetic powder containing Co is produced on the surface on the recording medium. The mixture of 10W50wt% of the magnetic powder and 50W90wt% of the γ-Fe2O3 powder is contained into the magnetic coating material, which is applied on the polyester film or the like to be dried. Thus the magnetic tape is obtained. The cobalt content iron oxide magnetic powder is given a higher magnetism keeping power than the γ-Fe2O3 powder by 20W100 Oe (30W80 Oe).
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9389178A JPS5522247A (en) | 1978-07-31 | 1978-07-31 | Magnetic recording medium |
US06/061,253 US4364988A (en) | 1978-07-31 | 1979-07-27 | Magnetic recording medium |
EP79102693A EP0007642A1 (en) | 1978-07-31 | 1979-07-28 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9389178A JPS5522247A (en) | 1978-07-31 | 1978-07-31 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5522247A true JPS5522247A (en) | 1980-02-16 |
Family
ID=14095093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9389178A Pending JPS5522247A (en) | 1978-07-31 | 1978-07-31 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5522247A (en) |
-
1978
- 1978-07-31 JP JP9389178A patent/JPS5522247A/en active Pending
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