JPS57143735A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57143735A
JPS57143735A JP56028784A JP2878481A JPS57143735A JP S57143735 A JPS57143735 A JP S57143735A JP 56028784 A JP56028784 A JP 56028784A JP 2878481 A JP2878481 A JP 2878481A JP S57143735 A JPS57143735 A JP S57143735A
Authority
JP
Japan
Prior art keywords
magnetic
layer
magnetic powder
whose
whose saturation
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
Application number
JP56028784A
Other languages
Japanese (ja)
Inventor
Masahiro Amamiya
Akira Miyake
Hiroshi Zaitsu
Yoshinori Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP56028784A priority Critical patent/JPS57143735A/en
Publication of JPS57143735A publication Critical patent/JPS57143735A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/716—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by two or more magnetic layers

Abstract

PURPOSE:To improve corrosion resistance and surface smoothness of a magnetic recording medium, by laminating a magnetic layer of a lower layer containing metallic magnetic powder whose saturation magnetizing quantity is large, and a magnetic layer of the uppermost layer containing metallic magnetic powder whose saturation magnetizing quantity is small, on a base body. CONSTITUTION:A magnetic layer of a lower layer is formed by applying a magnetic painting material consisting of metallic magnetic powder (example: alpha-Fe magnetic powder) whose saturation magnetizing quantity is >=140emu/g and whose coercive force is 400-1,500Oe, a binder and an organic solvent, on a base body of a polyester film, etc., and drying it. Subsequently, a magnetic layer of the uppermost layer is formed by applying a magnetic painting material consisting of metallic magnetic powder (example: Fe, Co) whose saturation magnetizing quantity is <=140emu/g and whose coercive force is 600-1,500 oersteds, a binder and an organic solvent, on said lower layer, and drying it. In this way, the drop- down rate of residual magnetic flux density, and surface roughness become small enough, and corrosion resistance and surface smoothness are improved.
JP56028784A 1981-02-27 1981-02-27 Magnetic recording medium Pending JPS57143735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56028784A JPS57143735A (en) 1981-02-27 1981-02-27 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56028784A JPS57143735A (en) 1981-02-27 1981-02-27 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57143735A true JPS57143735A (en) 1982-09-06

Family

ID=12258038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56028784A Pending JPS57143735A (en) 1981-02-27 1981-02-27 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57143735A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5256508A (en) * 1975-11-05 1977-05-10 Fuji Photo Film Co Ltd Novel magnetic recording medium
JPS5354002A (en) * 1976-10-26 1978-05-17 Sony Corp Magnetic recording medium
JPS5565405A (en) * 1978-11-13 1980-05-16 Hitachi Ltd Ferromagnetic metal powder for magnetic recording medium
JPS5613526A (en) * 1979-07-11 1981-02-09 Tdk Corp Magnetic recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5256508A (en) * 1975-11-05 1977-05-10 Fuji Photo Film Co Ltd Novel magnetic recording medium
JPS5354002A (en) * 1976-10-26 1978-05-17 Sony Corp Magnetic recording medium
JPS5565405A (en) * 1978-11-13 1980-05-16 Hitachi Ltd Ferromagnetic metal powder for magnetic recording medium
JPS5613526A (en) * 1979-07-11 1981-02-09 Tdk Corp Magnetic recording medium

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