JPS57208634A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57208634A
JPS57208634A JP9401681A JP9401681A JPS57208634A JP S57208634 A JPS57208634 A JP S57208634A JP 9401681 A JP9401681 A JP 9401681A JP 9401681 A JP9401681 A JP 9401681A JP S57208634 A JPS57208634 A JP S57208634A
Authority
JP
Japan
Prior art keywords
copolymer
rubber
magnetic
polyvinyl chloride
polyvinyl
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
JP9401681A
Other languages
Japanese (ja)
Other versions
JPH036570B2 (en
Inventor
Hitoshi Azegami
Hiroshi Kawahara
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.)
TDK Corp
Original Assignee
TDK Corp
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 TDK Corp filed Critical TDK Corp
Priority to JP9401681A priority Critical patent/JPS57208634A/en
Publication of JPS57208634A publication Critical patent/JPS57208634A/en
Publication of JPH036570B2 publication Critical patent/JPH036570B2/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
    • G11B5/7023—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 polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins

Landscapes

  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)

Abstract

PURPOSE:To obtain a magnetic recording medium having excellent surface properties, increased maximum residual magnetic flux density and high sensitivity at a high frequency region, by coating a binder containing specific two types of polyvinyl chloride copolymers and rubber substances on a supporter. CONSTITUTION:A magnetic coating material is obtained by dispersing the magnetic power (such as gamma-Fe2O3) to a binder containing (A) a copolymer having >=0.7 OH/CH absorption ratio of the infrared ray absorbing spectrum and obtained by giving the partial saponification to a copolymer of 50-75wt% polyvinyl chloride and 20-40wt% alkyl carboxylic acid vinylester (such as polyvinyl acetate, polyvinyl propionic acid, etc.), (B) a copolymer of 50-80wt% polyvinyl chloride, 20-40wt% alkyl carboxylic acid vinylester, and another 1.5-10wt% monomer (such as maleic acid, acrylic acid, etc.), and (C) rubber substance (acrylonitrile rubber, urethane rubber). This magnetic coating material is coated on a supporter.
JP9401681A 1981-06-19 1981-06-19 Magnetic recording medium Granted JPS57208634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9401681A JPS57208634A (en) 1981-06-19 1981-06-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9401681A JPS57208634A (en) 1981-06-19 1981-06-19 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57208634A true JPS57208634A (en) 1982-12-21
JPH036570B2 JPH036570B2 (en) 1991-01-30

Family

ID=14098698

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9401681A Granted JPS57208634A (en) 1981-06-19 1981-06-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57208634A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59186121A (en) * 1983-04-07 1984-10-22 Fuji Photo Film Co Ltd Magnetic recording medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51129202A (en) * 1975-05-06 1976-11-10 Tdk Corp Magnetic recording medium
JPS54151413A (en) * 1978-05-20 1979-11-28 Hitachi Maxell Magnetic recording medium
JPS567234A (en) * 1979-06-26 1981-01-24 Victor Co Of Japan Ltd Magnetic recording medium

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51129202A (en) * 1975-05-06 1976-11-10 Tdk Corp Magnetic recording medium
JPS54151413A (en) * 1978-05-20 1979-11-28 Hitachi Maxell Magnetic recording medium
JPS567234A (en) * 1979-06-26 1981-01-24 Victor Co Of Japan Ltd Magnetic recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59186121A (en) * 1983-04-07 1984-10-22 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0458651B2 (en) * 1983-04-07 1992-09-18 Fuji Photo Film Co Ltd

Also Published As

Publication number Publication date
JPH036570B2 (en) 1991-01-30

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