JPS57208633A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57208633A
JPS57208633A JP9401581A JP9401581A JPS57208633A JP S57208633 A JPS57208633 A JP S57208633A JP 9401581 A JP9401581 A JP 9401581A JP 9401581 A JP9401581 A JP 9401581A JP S57208633 A JPS57208633 A JP S57208633A
Authority
JP
Japan
Prior art keywords
polyvinyl
polyvinyl chloride
polymerization degree
magnetic
resin
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
JP9401581A
Other languages
Japanese (ja)
Other versions
JPH036569B2 (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 JP9401581A priority Critical patent/JPS57208633A/en
Publication of JPS57208633A publication Critical patent/JPS57208633A/en
Publication of JPH036569B2 publication Critical patent/JPH036569B2/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 obtain a magnetic recording medium having enhanced surface properties and increased maximum residual magnetic flux density, by coating a specific binder containing a polyvinyl chloride copolymer, the urethane resin (or polyester resin) and polyisocyanate on a supporter. CONSTITUTION:A magnetic coating material is obtained by dispersing the magnetic powder (like gamma-Fe2O3) to a binder containing (A) a polyvinyl chloride (>=1 kinds of polyvinyl-polyvinyl acetate-vinyl alcohol copolymer of <=350 polymerization degree, polyvinyl chloride-polyvinyl acetate-maleic acid copolymer of <=300 polymerization degree, and polyvinyl chloride-vinylidene chloride-maleic acid copolymer of <=350 polymerization degree), (B) >=1 kinds of urethane resin of 5,000-20,000 molecular weight and polyester resin of 500-2,500 molecular weriht, and (C) 5-30wt% polyisocyanate compound based on the whole quantity of resin. This magnetic coating material is coated on a supporter.
JP9401581A 1981-06-19 1981-06-19 Magnetic recording medium Granted JPS57208633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9401581A JPS57208633A (en) 1981-06-19 1981-06-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9401581A JPS57208633A (en) 1981-06-19 1981-06-19 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57208633A true JPS57208633A (en) 1982-12-21
JPH036569B2 JPH036569B2 (en) 1991-01-30

Family

ID=14098664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9401581A Granted JPS57208633A (en) 1981-06-19 1981-06-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57208633A (en)

Cited By (3)

* 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
JPS6055511A (en) * 1983-09-06 1985-03-30 Toshiba Corp Magnetic recording medium
JPS6057526A (en) * 1983-09-08 1985-04-03 Fuji Photo Film Co Ltd Magnetic recording medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5046106A (en) * 1973-08-28 1975-04-24
JPS50159709A (en) * 1974-06-14 1975-12-24
JPS5253406A (en) * 1975-10-28 1977-04-30 Fuji Photo Film Co Ltd Magnetic sheet
JPS54151412A (en) * 1978-05-20 1979-11-28 Hitachi Maxell Magnetic recording medium
JPS54151409A (en) * 1978-05-20 1979-11-28 Hitachi Maxell Magnetic recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5046106A (en) * 1973-08-28 1975-04-24
JPS50159709A (en) * 1974-06-14 1975-12-24
JPS5253406A (en) * 1975-10-28 1977-04-30 Fuji Photo Film Co Ltd Magnetic sheet
JPS54151412A (en) * 1978-05-20 1979-11-28 Hitachi Maxell Magnetic recording medium
JPS54151409A (en) * 1978-05-20 1979-11-28 Hitachi Maxell Magnetic recording medium

Cited By (5)

* 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
JPS6055511A (en) * 1983-09-06 1985-03-30 Toshiba Corp Magnetic recording medium
US4695513A (en) * 1983-09-06 1987-09-22 Kabushiki Kaisha Toshiba Magnetic recording medium
JPS6057526A (en) * 1983-09-08 1985-04-03 Fuji Photo Film Co Ltd Magnetic recording medium

Also Published As

Publication number Publication date
JPH036569B2 (en) 1991-01-30

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