JPS56119920A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56119920A
JPS56119920A JP2191980A JP2191980A JPS56119920A JP S56119920 A JPS56119920 A JP S56119920A JP 2191980 A JP2191980 A JP 2191980A JP 2191980 A JP2191980 A JP 2191980A JP S56119920 A JPS56119920 A JP S56119920A
Authority
JP
Japan
Prior art keywords
ohs
terminals
mol
polyol
total amount
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
JP2191980A
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 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 JP2191980A priority Critical patent/JPS56119920A/en
Publication of JPS56119920A publication Critical patent/JPS56119920A/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 dispersibility and durability of magnetic powder by using a binder contg. a modified urethane resin having polyurethane molecules having OHs at other than both terminals of the main chain, a polyvinyl butyral resin and a low mol.wt. polyol. CONSTITUTION:Modified polyurethane contg. polyurethane molecules having average 1-3 OHs per molecule at other than both terminals of the main chain and a polyvinyl butyral resin are compounded at ratios 9:1-1:9 by weight. A polyol of <=10,000 mol.wt. having OHs at both terminals is contained by 5-50wt% to the total amount of the three, this and said two resins, to prepare the binder component, whereby the dispersibility, abrasion resistance, etc. of magnetic powder are improved. Further, if polyisocyanate of <=1,000 mol.wt. is added at 3-50wt% of the total amount of this and said three resin components, crosslinking density is increased and heat resistance, chemical resistance and abrasion resistance are much improved.
JP2191980A 1980-02-22 1980-02-22 Magnetic recording medium Pending JPS56119920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2191980A JPS56119920A (en) 1980-02-22 1980-02-22 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2191980A JPS56119920A (en) 1980-02-22 1980-02-22 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56119920A true JPS56119920A (en) 1981-09-19

Family

ID=12068478

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2191980A Pending JPS56119920A (en) 1980-02-22 1980-02-22 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56119920A (en)

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