JPS5525855A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5525855A JPS5525855A JP9849978A JP9849978A JPS5525855A JP S5525855 A JPS5525855 A JP S5525855A JP 9849978 A JP9849978 A JP 9849978A JP 9849978 A JP9849978 A JP 9849978A JP S5525855 A JPS5525855 A JP S5525855A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- iron oxide
- magnetic
- iron
- ferrous
- 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
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To obtain the excellent electromagnetic property as well as to reduce the electrification property by using together both the magnetic iron oxide powder containing a specified amount of the ferrous iron and the Co-containing iron oxide magnetic powder featuring the higher coercive force than the magnetic iron oxide powder by 0W100 Oe.
CONSTITUTION: The γ-Fe2O3 powder is dispersed into the aqueous solution containing the Co salt, the ferrous salt and the equivalent alkali and the treated at the temperature lower than the boiling point of the dispersion solution. Thus the iron oxide layer containing Co and ferrous iron is formed on the iron oxide magnetic powder. Then the mixture magnetic powder composed of 70W97 parts by weight of the Co- containing iron oxide magnetic powder and 3W30 parts by weight of the magnetic iron oxide powder which contains the ferrous iron in the ratio of over 0.05 for specific Fe2+/Fe3+ between the ferrous iron and the ferric iron in the powder particle is coated on the substrate along with the bonding agent. In this case, the Co-containing iron oxide magnetic powder featuring the higher coercive force than the ferrous iron-containing magnetic iron oxide powder by 0W100 Oe is applied.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9849978A JPS5525855A (en) | 1978-08-11 | 1978-08-11 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9849978A JPS5525855A (en) | 1978-08-11 | 1978-08-11 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5525855A true JPS5525855A (en) | 1980-02-23 |
Family
ID=14221322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9849978A Pending JPS5525855A (en) | 1978-08-11 | 1978-08-11 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5525855A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6117221A (en) * | 1984-06-25 | 1986-01-25 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
-
1978
- 1978-08-11 JP JP9849978A patent/JPS5525855A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6117221A (en) * | 1984-06-25 | 1986-01-25 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
JPH0576691B2 (en) * | 1984-06-25 | 1993-10-25 | Konishiroku Photo Ind |
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