JPS54148504A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS54148504A JPS54148504A JP5663478A JP5663478A JPS54148504A JP S54148504 A JPS54148504 A JP S54148504A JP 5663478 A JP5663478 A JP 5663478A JP 5663478 A JP5663478 A JP 5663478A JP S54148504 A JPS54148504 A JP S54148504A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic powder
- recording medium
- phosphate
- coating
- 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.)
- Granted
Links
Abstract
PURPOSE: To improve the magnetic characteristics and electrical characteristics of the magnetic recording medium using the magnetic coating using phosphate of higher alcohol as a surface active agent by processing the magnetic powder to the acid side of pH≤4 in said magnetic coating.
CONSTITUTION: Magnetic powder such as γ-Fe2O3 is treated with an aqueous solution of nitric acid. 25 g of such magnetic powder is added to 500 cc of demineralized water, which is then boiled for 10 minutes. The solution which has been left standing until it cools down to ordinary temperature is measured of its pH and the value thus measured is defined as the pH of the magnetic powder. Such magnetic powder of pH value of 4 or under is kneaded together with phosphate of higher alcohol such as hexyl alcohol into a resin binder and the resultant magnetic coating is coated on a substrate such as polyester base.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5663478A JPS54148504A (en) | 1978-05-15 | 1978-05-15 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5663478A JPS54148504A (en) | 1978-05-15 | 1978-05-15 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54148504A true JPS54148504A (en) | 1979-11-20 |
JPS6349288B2 JPS6349288B2 (en) | 1988-10-04 |
Family
ID=13032740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5663478A Granted JPS54148504A (en) | 1978-05-15 | 1978-05-15 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54148504A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5740743A (en) * | 1980-08-23 | 1982-03-06 | Sony Corp | Magnetic recording medium |
JPS5792422A (en) * | 1980-11-25 | 1982-06-09 | Sony Corp | Magnetic recording medium |
US4647501A (en) * | 1983-03-14 | 1987-03-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
-
1978
- 1978-05-15 JP JP5663478A patent/JPS54148504A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5740743A (en) * | 1980-08-23 | 1982-03-06 | Sony Corp | Magnetic recording medium |
JPS6346489B2 (en) * | 1980-08-23 | 1988-09-16 | Sony Corp | |
JPS5792422A (en) * | 1980-11-25 | 1982-06-09 | Sony Corp | Magnetic recording medium |
JPS6346886B2 (en) * | 1980-11-25 | 1988-09-19 | Sony Corp | |
US4647501A (en) * | 1983-03-14 | 1987-03-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS6349288B2 (en) | 1988-10-04 |
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