JPS5446011A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5446011A JPS5446011A JP11240077A JP11240077A JPS5446011A JP S5446011 A JPS5446011 A JP S5446011A JP 11240077 A JP11240077 A JP 11240077A JP 11240077 A JP11240077 A JP 11240077A JP S5446011 A JPS5446011 A JP S5446011A
- Authority
- JP
- Japan
- Prior art keywords
- vinly
- vinyl
- acetate
- magnetic
- vinyl alcohol
- 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 smooth surface, increase square ratio, improve running characterristic and improve recording-reprodcing characteristics of high frequency range signals by using a specific binder in the magnetic layer of audio cassette tape.
CONSTITUTION: Vinly chloride-vinly acetate copolymer of preferably 300 to 500 in degree of polymerization is hydrolyzed of parr of its vinly acetate so as to be contained with 10 to 20 (preferably 10 to 15) wt% of vinyl alcohol units. This vinyl chloride-vinyl acetate-vinyl alcohol copolymer and polyether-polyurethane prepolymer containing preferably 4 ot 10wt% of NCO groups its molecular terminal are mixed in a range of 70/30 to 50/50 in weight ratio and preferably 15 to 30pts.wt. of this mixture is used with 100ps.wt. of ferromagnetic fine powder. The magnetic coating prepared by dispersing such binder and ferromagnetic powder is coated on a non-magnetic backing and is then dried
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11240077A JPS5446011A (en) | 1977-09-19 | 1977-09-19 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11240077A JPS5446011A (en) | 1977-09-19 | 1977-09-19 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5446011A true JPS5446011A (en) | 1979-04-11 |
Family
ID=14585701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11240077A Pending JPS5446011A (en) | 1977-09-19 | 1977-09-19 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5446011A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57158017A (en) * | 1981-03-20 | 1982-09-29 | Hitachi Maxell Ltd | Magnetic recording medium |
JPH03130916A (en) * | 1989-10-30 | 1991-06-04 | Tdk Corp | Magnetic recording medium and its production |
-
1977
- 1977-09-19 JP JP11240077A patent/JPS5446011A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57158017A (en) * | 1981-03-20 | 1982-09-29 | Hitachi Maxell Ltd | Magnetic recording medium |
JPS6126132B2 (en) * | 1981-03-20 | 1986-06-19 | Hitachi Maxell | |
JPH03130916A (en) * | 1989-10-30 | 1991-06-04 | Tdk Corp | Magnetic recording medium and its production |
JPH0514326B2 (en) * | 1989-10-30 | 1993-02-24 | Tdk Electronics Co Ltd |
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