JPS56101645A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56101645A
JPS56101645A JP515980A JP515980A JPS56101645A JP S56101645 A JPS56101645 A JP S56101645A JP 515980 A JP515980 A JP 515980A JP 515980 A JP515980 A JP 515980A JP S56101645 A JPS56101645 A JP S56101645A
Authority
JP
Japan
Prior art keywords
magnetic
coating material
polyurethane resin
modified polyurethane
durability
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
JP515980A
Other languages
Japanese (ja)
Inventor
Takezo Shimizu
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 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 JP515980A priority Critical patent/JPS56101645A/en
Publication of JPS56101645A publication Critical patent/JPS56101645A/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
    • G11B5/702—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 bonding agent
    • G11B5/7021—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 bonding agent containing a polyurethane or a polyisocyanate
    • G11B5/7022—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 bonding agent containing a polyurethane or a polyisocyanate containing mixtures of polyurethanes or polyisocyanates with other polymers

Landscapes

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

Abstract

PURPOSE:To improve durability, and dispersibility of magnetic powder, by permitting a magnetic coating material to contain modified polyurethane resin, containing essentially molecules having hydroxyl group, and a polyvinyl butyral at positions other than both terminals of principal chain as binder components of the magnetic coating material. CONSTITUTION:As the binder component of a magnetic coating material, modified polyurethane resin containing essentially molecules with hydroxyl group at positions other than both terminals of principal chain is used. Consequently, the dispersibility of magnetic powder can be improved as well as durability, and magnetic conversion characteristics, such as the output and SN ratio, and durability can further be improved by using this modified polyurethane resin and polyvinyl butyral resin in combination.
JP515980A 1980-01-18 1980-01-18 Magnetic recording medium Pending JPS56101645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP515980A JPS56101645A (en) 1980-01-18 1980-01-18 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP515980A JPS56101645A (en) 1980-01-18 1980-01-18 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56101645A true JPS56101645A (en) 1981-08-14

Family

ID=11603467

Family Applications (1)

Application Number Title Priority Date Filing Date
JP515980A Pending JPS56101645A (en) 1980-01-18 1980-01-18 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56101645A (en)

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