JPS56101629A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56101629A
JPS56101629A JP471480A JP471480A JPS56101629A JP S56101629 A JPS56101629 A JP S56101629A JP 471480 A JP471480 A JP 471480A JP 471480 A JP471480 A JP 471480A JP S56101629 A JPS56101629 A JP S56101629A
Authority
JP
Japan
Prior art keywords
molecular weight
magnetic layer
polyol
binder
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.)
Pending
Application number
JP471480A
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 JP471480A priority Critical patent/JPS56101629A/en
Publication of JPS56101629A publication Critical patent/JPS56101629A/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 providing a magnetic layer which contains a specific quatenary copolymer, low-molecular polyol and trifunctional low-molecular weight isocyanate. CONSTITUTION:To a copolymer consisting of 70-80wt% vinyl chloride, 1-5wt% vinyl acetate, 2-10wt% acrylic ester, a 5-50wt% substance of about 500-10,000 mean molecular weight having active OH group, such as polyester type urethane polyol, polyester polyol and polyester polyol, is added to obtain a binder. Further, a magnetic layer is provided by using a binder obtained by adding 3-50wt% trifunctional low-molecular weight isocyanate to all amount of the former binder, so that the dispersibility, heat resistance, durability, etc., of the magnetic layer will further be improved.
JP471480A 1980-01-19 1980-01-19 Magnetic recording medium Pending JPS56101629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP471480A JPS56101629A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP471480A JPS56101629A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56101629A true JPS56101629A (en) 1981-08-14

Family

ID=11591545

Family Applications (1)

Application Number Title Priority Date Filing Date
JP471480A Pending JPS56101629A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56101629A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885925A (en) * 1981-11-16 1983-05-23 Tdk Corp Magnetic recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885925A (en) * 1981-11-16 1983-05-23 Tdk Corp Magnetic recording medium
JPS6240765B2 (en) * 1981-11-16 1987-08-31 Tdk Electronics Co Ltd

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