JPS56119929A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56119929A
JPS56119929A JP2310680A JP2310680A JPS56119929A JP S56119929 A JPS56119929 A JP S56119929A JP 2310680 A JP2310680 A JP 2310680A JP 2310680 A JP2310680 A JP 2310680A JP S56119929 A JPS56119929 A JP S56119929A
Authority
JP
Japan
Prior art keywords
contg
terminals
copolymer
main chain
vinyl
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
JP2310680A
Other languages
Japanese (ja)
Inventor
Takezo Shimizu
Toshihiko Tanabe
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 JP2310680A priority Critical patent/JPS56119929A/en
Publication of JPS56119929A publication Critical patent/JPS56119929A/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 durability and the dispersibility of magnetic powder by using a binder contg. a modified polyurethane resin contg. polyurethane molecules having OH at other than both terminals of the main chain, a vinyl chloride-vinyl propionate copolymer and a specific urethane prepolymer. CONSTITUTION:A magnetic tape which is superior in the dispersibility of magnetic powder and durability is obtained by using the binder which contains a modified polyurethane resin contg. polyurethane molecules having OH at other than both terminals of the main chain (both terminals may or may not have OH or only one of them may have OH, and OH may exist in the side chain), and a vinyl chloride- vinyl propionate copolymer (contg. a copolymer of >=3 elements of vinyl alcohol and others) in 1:9-9:1 ratio range by weight and contains a urethane prepolymer having NCO at both terminals of the main chain in 5-50wt% of the total amount of this prepolymer and said compounded copolymer. Further, abrasion resistance, heat resistance, etc. are more improved by contg. low mol.wt. polyisocyanate.
JP2310680A 1980-02-25 1980-02-25 Magnetic recording medium Pending JPS56119929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2310680A JPS56119929A (en) 1980-02-25 1980-02-25 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2310680A JPS56119929A (en) 1980-02-25 1980-02-25 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS56119929A true JPS56119929A (en) 1981-09-19

Family

ID=12101208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2310680A Pending JPS56119929A (en) 1980-02-25 1980-02-25 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS56119929A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108031A (en) * 1981-12-21 1983-06-28 Dainippon Ink & Chem Inc Magnetic recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108031A (en) * 1981-12-21 1983-06-28 Dainippon Ink & Chem Inc Magnetic recording medium

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