JPS56101626A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56101626A
JPS56101626A JP471180A JP471180A JPS56101626A JP S56101626 A JPS56101626 A JP S56101626A JP 471180 A JP471180 A JP 471180A JP 471180 A JP471180 A JP 471180A JP S56101626 A JPS56101626 A JP S56101626A
Authority
JP
Japan
Prior art keywords
magnetic powder
dispersibility
copolymer
vinyl
binder
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
JP471180A
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 JP471180A priority Critical patent/JPS56101626A/en
Publication of JPS56101626A publication Critical patent/JPS56101626A/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 vinyl chloride-vinyl acetate acrylic ester vinyl alcohol copolymer or/and trifunctional low-molecular weight isocyanate. CONSTITUTION:The dispersibility and output characteristics of magnetic powder are improved by using a magnetic layer having as a binder a copolymer of 200- 600 polymerization degree with composition of 70-80wt% vinyl chloride, 1-5wt% vinyl acetate, 2-10wt% acrylic ester, and 10-20wt% vinyl alcohol. Then, 3- 50wt% trifunctional low-molecular weight isocyanate, obtained by a reaction between 1mol triol and 3mol diisocyanate, is added to the said copolymer to obtain a binder, which is used for the magnetic powder. Thus, the dispersibility, wear resistance and heat resistance of the magnetic powder are improved and output fluctuations are reduced.
JP471180A 1980-01-19 1980-01-19 Magnetic recording medium Pending JPS56101626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP471180A JPS56101626A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP471180A JPS56101626A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56101626A true JPS56101626A (en) 1981-08-14

Family

ID=11591461

Family Applications (1)

Application Number Title Priority Date Filing Date
JP471180A Pending JPS56101626A (en) 1980-01-19 1980-01-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56101626A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4861683A (en) * 1987-03-25 1989-08-29 Sekisui Kagaku Kogyo Kabushiki Kaisha Quaternary-containing resin used for magnetic recording media
US5028676A (en) * 1989-06-26 1991-07-02 Sekisui Kagaku Kogyo Kabushiki Kaisha Resin for magnetic recording media from vinyl chloride with quanternary and phosphoric monomers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4861683A (en) * 1987-03-25 1989-08-29 Sekisui Kagaku Kogyo Kabushiki Kaisha Quaternary-containing resin used for magnetic recording media
US5008357A (en) * 1987-03-25 1991-04-16 Sekisui Kagaku Kogyo Kabushiki Kaisha Resin for magnetic recording media from vinyl chloride polymer with quaternary groups
US5037893A (en) * 1987-03-25 1991-08-06 Sekisui Kagaku Kogyo Kabushiki Kaisha Resin used for magnetic recording media derived from vinyl chloride and quaternary monomer
US5028676A (en) * 1989-06-26 1991-07-02 Sekisui Kagaku Kogyo Kabushiki Kaisha Resin for magnetic recording media from vinyl chloride with quanternary and phosphoric monomers

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