JPS5677932A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5677932A JPS5677932A JP15319679A JP15319679A JPS5677932A JP S5677932 A JPS5677932 A JP S5677932A JP 15319679 A JP15319679 A JP 15319679A JP 15319679 A JP15319679 A JP 15319679A JP S5677932 A JPS5677932 A JP S5677932A
- Authority
- JP
- Japan
- Prior art keywords
- binder
- powder
- silicon nitride
- coated layer
- recording medium
- 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)
Abstract
PURPOSE: To reduce the variation with time and increase the durability of a coated layer, by forming a magnetic layer on a surface of the nonmagnetic supporter along with a coated layer containing the carbon and the silicon nitride provided on the other surface.
CONSTITUTION: The coated layer 3 composed of the carbon powder, the powder of silicon nitride functioning as the reinforcement agent and the binder each is provided at the opposite side of the nonmagnetic supporter 1 containing the magnetic layer 2. The powder of silicon nitride is selected to 10W40wt% for the powder component. For the binder, the ratio P/B between the quantity (weight) P of the powder component and the quantity (weight) B of the binder is set within 0.5W2.0 range. And the hardening agent to the binder is selected to 5W30pts.wt. against 100pts.wt. binder.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15319679A JPS5677932A (en) | 1979-11-26 | 1979-11-26 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15319679A JPS5677932A (en) | 1979-11-26 | 1979-11-26 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5677932A true JPS5677932A (en) | 1981-06-26 |
Family
ID=15557135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15319679A Pending JPS5677932A (en) | 1979-11-26 | 1979-11-26 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5677932A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60229235A (en) * | 1984-04-27 | 1985-11-14 | Fuji Photo Film Co Ltd | Manufacture for magnetic recording medium |
US4748073A (en) * | 1985-06-29 | 1988-05-31 | Kabushiki Kaisha Toshiba | Perpendicular magnetic recording medium with multilayered protective layer |
-
1979
- 1979-11-26 JP JP15319679A patent/JPS5677932A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60229235A (en) * | 1984-04-27 | 1985-11-14 | Fuji Photo Film Co Ltd | Manufacture for magnetic recording medium |
JPH0458654B2 (en) * | 1984-04-27 | 1992-09-18 | Fuji Photo Film Co Ltd | |
US4748073A (en) * | 1985-06-29 | 1988-05-31 | Kabushiki Kaisha Toshiba | Perpendicular magnetic recording medium with multilayered protective layer |
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