JPS55139636A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS55139636A JPS55139636A JP4643379A JP4643379A JPS55139636A JP S55139636 A JPS55139636 A JP S55139636A JP 4643379 A JP4643379 A JP 4643379A JP 4643379 A JP4643379 A JP 4643379A JP S55139636 A JPS55139636 A JP S55139636A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- molecular
- resin
- magnetic
- dispersibility
- 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 dispersibility of magnetic powder by using polyurethane resin, which has not less than three hdroxyl groups in all at random positions of molecular ends and molecular chains, and cellulosic resin as binder components of magnetic powder applied on a base.
CONSTITUTION: Polyurethan resin, which has not less than three hydroxyl groups in all at random positions of molecular ends and molecular chains and is about 10,000W100,000 in molecular weight, and cellulosic resin are blended and polyisocyanate of low molecular weight is added at need so as to obtain binding agent components, which are mixed and dispersed in an adequate organic solvent together with magnetic powder of Fe2O3, etc., containing Co. This magnetic coating is applied on a base of a polyester film, etc., and then dried. Consequently, the dispersibility of the magnetic powder is improved, the magnetic layer is also improved, and its SN ratio is further increased.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4643379A JPS55139636A (en) | 1979-04-16 | 1979-04-16 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4643379A JPS55139636A (en) | 1979-04-16 | 1979-04-16 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55139636A true JPS55139636A (en) | 1980-10-31 |
JPH0152817B2 JPH0152817B2 (en) | 1989-11-10 |
Family
ID=12747011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4643379A Granted JPS55139636A (en) | 1979-04-16 | 1979-04-16 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55139636A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01251419A (en) * | 1988-03-31 | 1989-10-06 | Toppan Printing Co Ltd | Magnetic recording medium |
-
1979
- 1979-04-16 JP JP4643379A patent/JPS55139636A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01251419A (en) * | 1988-03-31 | 1989-10-06 | Toppan Printing Co Ltd | Magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPH0152817B2 (en) | 1989-11-10 |
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