JPS56101633A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56101633A
JPS56101633A JP471880A JP471880A JPS56101633A JP S56101633 A JPS56101633 A JP S56101633A JP 471880 A JP471880 A JP 471880A JP 471880 A JP471880 A JP 471880A JP S56101633 A JPS56101633 A JP S56101633A
Authority
JP
Japan
Prior art keywords
molecular weight
polyol
binder
dispersibility
low
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
JP471880A
Other languages
Japanese (ja)
Inventor
Osamu Saito
Fumio Togawa
Takezo Shimizu
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 JP471880A priority Critical patent/JPS56101633A/en
Publication of JPS56101633A publication Critical patent/JPS56101633A/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 the dispersibility, wear resistance and heat resistance of magnetic powder by using a binder which contains a composition of a specific ternary copolymer and low-molecular weight polyol and trifunctional low-molecular weight isocyanate. CONSTITUTION:To a ternary copolymer of 200-600 polymerization degree consisting of 70-80wt% vinyl chloride, 1-25wt% vinyl propionate and 5-20wt% vinyl alcohol, polyol of 500-10,000 mean molecular weight, such as polyester type urethane polyol and polyester polyol, having active OH group is added to obtain a binder, which is used to improve the dispersibility of magnetic powder, the flexibility of a magnetic layer, etc. In addition, 3-50wt% trifunctional low-molecular weight isocyanate is added to the whole binder.
JP471880A 1980-01-19 1980-01-19 Magnetic recording medium Pending JPS56101633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP471880A JPS56101633A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP471880A JPS56101633A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56101633A true JPS56101633A (en) 1981-08-14

Family

ID=11591655

Family Applications (1)

Application Number Title Priority Date Filing Date
JP471880A Pending JPS56101633A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56101633A (en)

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