JPS56101628A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56101628A
JPS56101628A JP471380A JP471380A JPS56101628A JP S56101628 A JPS56101628 A JP S56101628A JP 471380 A JP471380 A JP 471380A JP 471380 A JP471380 A JP 471380A JP S56101628 A JPS56101628 A JP S56101628A
Authority
JP
Japan
Prior art keywords
dispersibility
copolymer
magnetic
magnetic layer
magnetic powder
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
JP471380A
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 JP471380A priority Critical patent/JPS56101628A/en
Publication of JPS56101628A publication Critical patent/JPS56101628A/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 wear resistance and heat resistance as well as the dispersibility of magnetic powder by providing a magnetic layer which contains a specific quaternary copolymer, urethane prepolymer and trifunctional low-molecular weight isocyanate. CONSTITUTION:A copolymer of 200-600 polymerization degree consisting of 70- 80wt% vinyl chloride, 1-5wt% vinyl acetate, 2-10wt% acrylic ester, and 10- 20wt% vinyl alcohol improves the dispersibility of magnetic powder while preventing vinyl chloride from deteriorating, and also prevents gelling during the formation of magnetic coating to improve the weather resistance of a magnetic layer. Then, the magnetic layer is formed by a 5-50wt% straight-chain urethane polymer of about 2,000-10,000 mean molecular weight having free isocyanate group at both terminals, and a composition obtained by adding 2pts.wt. trifunctional low-molecular-weight triol to a total 100pts.wt. compound of a copolymer and said urethane resin. Thus, the dispersibility, durability, etc., of magnetic powder are further improved.
JP471380A 1980-01-19 1980-01-19 Magnetic recording medium Pending JPS56101628A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP471380A JPS56101628A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP471380A JPS56101628A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56101628A true JPS56101628A (en) 1981-08-14

Family

ID=11591517

Family Applications (1)

Application Number Title Priority Date Filing Date
JP471380A Pending JPS56101628A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56101628A (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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