JPS5556605A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5556605A JPS5556605A JP12986478A JP12986478A JPS5556605A JP S5556605 A JPS5556605 A JP S5556605A JP 12986478 A JP12986478 A JP 12986478A JP 12986478 A JP12986478 A JP 12986478A JP S5556605 A JPS5556605 A JP S5556605A
- Authority
- JP
- Japan
- Prior art keywords
- water
- magnetic powder
- powder
- dispersed
- water solution
- 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 improve electromagnetic conversion characteristics, by using γ-Fe2O3 power or iron oxide magnetic powder partially reduced as magnetic powder, and by treating the powder at temperatures not more than 50°C by employing dispersed liquid containing cobalt salt, ferrous salt and alkali.
CONSTITUTION: A fixed quantity of acicualr γ-Fe2O3 powder, which mean grain size is approximate 0.3μm, which axial ratio is approximate 10, which coercive force 330 oersted and which saturated magnetism is 74emu/g, is dispersed in water, and a water solution in which cobalt sulfate and ferrous sulfate, which are prepared in fixed mol, are dissolved is added to the water. A water solution in which NaOH not less than equivalent to the total amount of cobalt salt and ferrous salt is dissolved is added to the water solution, and agitated for several hours while holding it at room temperature. The dispersed liquid is filtered, and magnetic powder is extracted, sufficiently washed with water and dried at 130°C. Thus, a dispersed condition is bettered, and characteristics are improved as seen in 550 oersted coercive force and 755emu/g saturated magnetism.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12986478A JPS5556605A (en) | 1978-10-20 | 1978-10-20 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12986478A JPS5556605A (en) | 1978-10-20 | 1978-10-20 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5556605A true JPS5556605A (en) | 1980-04-25 |
Family
ID=15020156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12986478A Pending JPS5556605A (en) | 1978-10-20 | 1978-10-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5556605A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5556019A (en) * | 1978-10-20 | 1980-04-24 | Hitachi Maxell Ltd | Production of ferromagnetic powder |
| JPS57123831A (en) * | 1981-01-20 | 1982-08-02 | Sakai Chem Ind Co Ltd | Preparation of magnetic iron oxide powder |
| US4551327A (en) * | 1982-07-16 | 1985-11-05 | Ishihara Sangyo Kaishi, Limited | Process for producing cobalt-and ferrous iron-containing ferromagnetic iron oxides |
| US7153270B2 (en) | 2004-02-18 | 2006-12-26 | Omron Healthcare Co., Ltd. | Device for securing living body by pressing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5037667A (en) * | 1973-08-07 | 1975-04-08 |
-
1978
- 1978-10-20 JP JP12986478A patent/JPS5556605A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5037667A (en) * | 1973-08-07 | 1975-04-08 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5556019A (en) * | 1978-10-20 | 1980-04-24 | Hitachi Maxell Ltd | Production of ferromagnetic powder |
| JPS6242858B2 (en) * | 1978-10-20 | 1987-09-10 | Hitachi Maxell | |
| JPS57123831A (en) * | 1981-01-20 | 1982-08-02 | Sakai Chem Ind Co Ltd | Preparation of magnetic iron oxide powder |
| JPS6029646B2 (en) * | 1981-01-20 | 1985-07-11 | 堺化学工業株式会社 | Method for producing magnetic iron oxide powder |
| US4551327A (en) * | 1982-07-16 | 1985-11-05 | Ishihara Sangyo Kaishi, Limited | Process for producing cobalt-and ferrous iron-containing ferromagnetic iron oxides |
| US7153270B2 (en) | 2004-02-18 | 2006-12-26 | Omron Healthcare Co., Ltd. | Device for securing living body by pressing |
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