JPS56101643A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56101643A
JPS56101643A JP515780A JP515780A JPS56101643A JP S56101643 A JPS56101643 A JP S56101643A JP 515780 A JP515780 A JP 515780A JP 515780 A JP515780 A JP 515780A JP S56101643 A JPS56101643 A JP S56101643A
Authority
JP
Japan
Prior art keywords
coating material
polyurethane resin
modified polyurethane
magnetic coating
dispersibility
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.)
Granted
Application number
JP515780A
Other languages
Japanese (ja)
Other versions
JPH0222444B2 (en
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 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 JP515780A priority Critical patent/JPS56101643A/en
Publication of JPS56101643A publication Critical patent/JPS56101643A/en
Publication of JPH0222444B2 publication Critical patent/JPH0222444B2/ja
Granted 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 vinyl chloride-vinyl acetate copolymer 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 further electromagnetic conversion characteristics, such as the output and SN ratio, can be improved more by using the modified polyurethane resin and a vinyl chloride-vinyl acetate copolymer in combination.
JP515780A 1980-01-18 1980-01-18 Magnetic recording medium Granted JPS56101643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP515780A JPS56101643A (en) 1980-01-18 1980-01-18 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP515780A JPS56101643A (en) 1980-01-18 1980-01-18 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS56101643A true JPS56101643A (en) 1981-08-14
JPH0222444B2 JPH0222444B2 (en) 1990-05-18

Family

ID=11603416

Family Applications (1)

Application Number Title Priority Date Filing Date
JP515780A Granted JPS56101643A (en) 1980-01-18 1980-01-18 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56101643A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011006A (en) * 1973-05-29 1975-02-04
JPS5046104A (en) * 1973-08-28 1975-04-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011006A (en) * 1973-05-29 1975-02-04
JPS5046104A (en) * 1973-08-28 1975-04-24

Also Published As

Publication number Publication date
JPH0222444B2 (en) 1990-05-18

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