JPS56114129A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS56114129A
JPS56114129A JP1660980A JP1660980A JPS56114129A JP S56114129 A JPS56114129 A JP S56114129A JP 1660980 A JP1660980 A JP 1660980A JP 1660980 A JP1660980 A JP 1660980A JP S56114129 A JPS56114129 A JP S56114129A
Authority
JP
Japan
Prior art keywords
molecular weight
recording medium
magnetic recording
value
average molecular
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
JP1660980A
Other languages
Japanese (ja)
Other versions
JPH0318247B2 (en
Inventor
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 JP1660980A priority Critical patent/JPS56114129A/en
Priority to DE19803047377 priority patent/DE3047377A1/en
Publication of JPS56114129A publication Critical patent/JPS56114129A/en
Publication of JPH0318247B2 publication Critical patent/JPH0318247B2/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

Abstract

PURPOSE: To improve the running property specially by using a specific resin binder.
CONSTITUTION: The magnetic layer obtained by dispersing magnetic powder consisting of γ-Fe2O3 and so on in the binder where the urethane resin with the molecular weight distribution (Q value, weight average molecular weight/number average molecular weight) expanded as ≥2.5 and, as required, another esin such as a vinyl chloride-vinyl acetate copolymer are used is provided on the substance to obtain a magnetic recording medium. Specially, the urethane resin of 3.6W8.0 Q value is desirable.
COPYRIGHT: (C)1981,JPO&Japio
JP1660980A 1980-02-15 1980-02-15 Magnetic recording medium Granted JPS56114129A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1660980A JPS56114129A (en) 1980-02-15 1980-02-15 Magnetic recording medium
DE19803047377 DE3047377A1 (en) 1980-02-15 1980-12-16 Magnetic recording medium with resin rubber binder mixt. - for magnetic powder contg. polyurethane rubber with specified mol. wt. distribution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1660980A JPS56114129A (en) 1980-02-15 1980-02-15 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS56114129A true JPS56114129A (en) 1981-09-08
JPH0318247B2 JPH0318247B2 (en) 1991-03-12

Family

ID=11921047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1660980A Granted JPS56114129A (en) 1980-02-15 1980-02-15 Magnetic recording medium

Country Status (2)

Country Link
JP (1) JPS56114129A (en)
DE (1) DE3047377A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3401771A1 (en) * 1984-01-19 1985-08-01 Agfa-Gevaert Ag, 5090 Leverkusen MAGNETIC STORAGE MEDIUM

Also Published As

Publication number Publication date
DE3047377A1 (en) 1981-09-10
JPH0318247B2 (en) 1991-03-12

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