JPS57186302A - Magnetic unit and magnetic recording medium - Google Patents

Magnetic unit and magnetic recording medium

Info

Publication number
JPS57186302A
JPS57186302A JP56070679A JP7067981A JPS57186302A JP S57186302 A JPS57186302 A JP S57186302A JP 56070679 A JP56070679 A JP 56070679A JP 7067981 A JP7067981 A JP 7067981A JP S57186302 A JPS57186302 A JP S57186302A
Authority
JP
Japan
Prior art keywords
group
epoxy group
magnetic
molecular weight
functional groups
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
Application number
JP56070679A
Other languages
Japanese (ja)
Other versions
JPH0480521B2 (en
Inventor
Hirohisa Kato
Toshihiko Oguchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56070679A priority Critical patent/JPS57186302A/en
Publication of JPS57186302A publication Critical patent/JPS57186302A/en
Publication of JPH0480521B2 publication Critical patent/JPH0480521B2/ja
Granted 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
    • G11B5/712—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 the surface treatment or coating of magnetic particles

Abstract

PURPOSE:To obtan a medium having excellent dispersibility and dispersing stability and adapted for high density recording by covering the surface of a ferromagnetic powder with silane coupling agent having an epoxy group, and treating it with a compound having one to three adjacent functional groups including reaction activity for the epoxy group and more than 100 of molecular weight. CONSTITUTION:gamma-Fe2O3, Fe3O4, Fe-Co, Co-Cr or the like is used for a ferromagnetic powder, and the surface is covered with a silane coupling agent having an epoxy group such as beta-(3,4-epoxycyclohexyl)ethyl, trimethoxy silane, or the like. The surface is further treated with a compound which has one to three adjacent functional groups including reaction activity for the epoxy group such as amino group, amide group, carboxyl group, carboxylic acid chloride group, hydroxyl group, isocyanate group or the like and which has more than 300 of molecular weight, thereby forming a coupling layer. In this manner, a medium having low noise level can be produced.
JP56070679A 1981-05-13 1981-05-13 Magnetic unit and magnetic recording medium Granted JPS57186302A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56070679A JPS57186302A (en) 1981-05-13 1981-05-13 Magnetic unit and magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070679A JPS57186302A (en) 1981-05-13 1981-05-13 Magnetic unit and magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57186302A true JPS57186302A (en) 1982-11-16
JPH0480521B2 JPH0480521B2 (en) 1992-12-18

Family

ID=13438567

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070679A Granted JPS57186302A (en) 1981-05-13 1981-05-13 Magnetic unit and magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57186302A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59172562A (en) * 1983-03-20 1984-09-29 Hitachi Maxell Ltd Magnetic paint
JPS59218630A (en) * 1983-05-26 1984-12-08 Kao Corp Magnetic recording medium
JPS59218631A (en) * 1983-05-26 1984-12-08 Kao Corp Magnetic recording medium
CN115403300A (en) * 2022-08-31 2022-11-29 合肥工业大学 Modified nano foam stabilizer and application thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5376958A (en) * 1976-12-20 1978-07-07 Hitachi Maxell Metal magnetic powder and said manufacturing process

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5376958A (en) * 1976-12-20 1978-07-07 Hitachi Maxell Metal magnetic powder and said manufacturing process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59172562A (en) * 1983-03-20 1984-09-29 Hitachi Maxell Ltd Magnetic paint
JPS59218630A (en) * 1983-05-26 1984-12-08 Kao Corp Magnetic recording medium
JPS59218631A (en) * 1983-05-26 1984-12-08 Kao Corp Magnetic recording medium
CN115403300A (en) * 2022-08-31 2022-11-29 合肥工业大学 Modified nano foam stabilizer and application thereof
CN115403300B (en) * 2022-08-31 2023-09-26 合肥工业大学 Modified nano foam stabilizer and application thereof

Also Published As

Publication number Publication date
JPH0480521B2 (en) 1992-12-18

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