JPS57138047A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57138047A
JPS57138047A JP2249981A JP2249981A JPS57138047A JP S57138047 A JPS57138047 A JP S57138047A JP 2249981 A JP2249981 A JP 2249981A JP 2249981 A JP2249981 A JP 2249981A JP S57138047 A JPS57138047 A JP S57138047A
Authority
JP
Japan
Prior art keywords
magnetic layers
recording medium
magnetic recording
resin
uneven
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
JP2249981A
Other languages
Japanese (ja)
Inventor
Yoshinori Yamamoto
Hiroshi Zaitsu
Akira Miyake
Masahiro Amamiya
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 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 JP2249981A priority Critical patent/JPS57138047A/en
Publication of JPS57138047A publication Critical patent/JPS57138047A/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

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To manufacture a magnetic recording medium of multilayer construction less in uneven sensitivity and output fluctuation, and uneven thickness, by adding two specific types of resins and a polyfunctional isocyanate compound to a binding agent of lower magnetic layers. CONSTITUTION:In a magnetic recording medium in which >=2 magnetic layers are formed in multilayer on a base, (A) a polyvinyl lacetal 1 resin (e.g., polyvinyl butiral resin), (B) a polyester resin including >=2 hydroxyl groups (normally, 2,000-30,000 molecular weight), and (C) an isocyanate compound including >=2 isocyanate groups (e.g., tolylene diisocyanate) are added to a binding agent of magnetic layers other than the uppermost layer. The isocyanate group in the compound C reacts with the hydroxyl group in the resins A and B, they are cross-linked in three dimention, the solubility against solvent is increased, uneven thickness of the magnetic layers is reduced, and uneven sensitivity and output fluctuation are prevented from being increased.
JP2249981A 1981-02-17 1981-02-17 Magnetic recording medium Pending JPS57138047A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2249981A JPS57138047A (en) 1981-02-17 1981-02-17 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2249981A JPS57138047A (en) 1981-02-17 1981-02-17 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57138047A true JPS57138047A (en) 1982-08-26

Family

ID=12084429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2249981A Pending JPS57138047A (en) 1981-02-17 1981-02-17 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57138047A (en)

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