JPS57152540A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57152540A
JPS57152540A JP56039843A JP3984381A JPS57152540A JP S57152540 A JPS57152540 A JP S57152540A JP 56039843 A JP56039843 A JP 56039843A JP 3984381 A JP3984381 A JP 3984381A JP S57152540 A JPS57152540 A JP S57152540A
Authority
JP
Japan
Prior art keywords
epoxy compound
binder
liquid epoxy
bonding
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
Application number
JP56039843A
Other languages
Japanese (ja)
Inventor
Sadamu Kuze
Masayoshi Kawarai
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 JP56039843A priority Critical patent/JPS57152540A/en
Publication of JPS57152540A publication Critical patent/JPS57152540A/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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/735—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer
    • G11B5/7356—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • G11B5/7358—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2 specially adapted for achieving a specific property, e.g. average roughness [Ra]

Abstract

PURPOSE:To improve coating operability and to form a back-coating layer which has excellent strength, by adding a liquid epoxy compound to back-coating paint made by bonding a nonmagnetic material to a specific binder. CONSTITUTION:A back-coating layer, formed by bonding nonmagnetic powder, such as alumina powder, having >=6 Mohs' hardness to a binder which contains a vinyl chloride-vinyl acetate copolymer having carboxyl groups, contains a liquid epoxy compound. As this liquid epoxy compound, an epoxy compound in a cyclic aliphatic system such as 3.4-epoxy cyclohexyl methyl-3.4-epoxy cyclohexane carboxylate is used by 0.1-20wt% and favorably 1-10wt% for the whole binder.
JP56039843A 1981-03-18 1981-03-18 Magnetic recording medium Pending JPS57152540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56039843A JPS57152540A (en) 1981-03-18 1981-03-18 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56039843A JPS57152540A (en) 1981-03-18 1981-03-18 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57152540A true JPS57152540A (en) 1982-09-20

Family

ID=12564239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56039843A Pending JPS57152540A (en) 1981-03-18 1981-03-18 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57152540A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6079522A (en) * 1983-10-04 1985-05-07 Sony Corp Magnetic recording medium
JPS6159623A (en) * 1984-08-29 1986-03-27 Hitachi Maxell Ltd Magnetic recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6079522A (en) * 1983-10-04 1985-05-07 Sony Corp Magnetic recording medium
JPH0533448B2 (en) * 1983-10-04 1993-05-19 Sony Corp
JPS6159623A (en) * 1984-08-29 1986-03-27 Hitachi Maxell Ltd Magnetic recording medium
JPH0470686B2 (en) * 1984-08-29 1992-11-11 Hitachi Maxell

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