JPS57158017A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57158017A
JPS57158017A JP4148481A JP4148481A JPS57158017A JP S57158017 A JPS57158017 A JP S57158017A JP 4148481 A JP4148481 A JP 4148481A JP 4148481 A JP4148481 A JP 4148481A JP S57158017 A JPS57158017 A JP S57158017A
Authority
JP
Japan
Prior art keywords
tdi
polyurethane elastomer
component
isocyanate component
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.)
Granted
Application number
JP4148481A
Other languages
Japanese (ja)
Other versions
JPS6126132B2 (en
Inventor
Takezo Shimizu
Fumio Togawa
Haruo Ando
Susumu Kitaoka
Kosaburo Sato
Osamu Saito
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 JP4148481A priority Critical patent/JPS57158017A/en
Publication of JPS57158017A publication Critical patent/JPS57158017A/en
Publication of JPS6126132B2 publication Critical patent/JPS6126132B2/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 dispersibility and durability of magnetic powder by adding polyurethane elastomer which uses a vinyl chloride copolymer and TDI as an isocyanate component and has specific molecular weight to a binder for a magnetic layer. CONSTITUTION:A binder for a magnetic layer contains polyurethane elastomer which uses a vinyl chloride copolymer and tolylenediisocyanate (TDI) as an isocyanate component and has >=10,000 mean molecular weight. In this case, said polyurethane elastomer is obtained through the condensation polymerization of a polyol component and TDI as the isocyanate component in the usual way, and as the polyol component, a polyester polyol component of polyhydric alcohol such as 1mm.4 butanediol, etc., and polybasic acid such as adipic acid, various polyether polyol components, etc., are usable.
JP4148481A 1981-03-20 1981-03-20 Magnetic recording medium Granted JPS57158017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4148481A JPS57158017A (en) 1981-03-20 1981-03-20 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4148481A JPS57158017A (en) 1981-03-20 1981-03-20 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57158017A true JPS57158017A (en) 1982-09-29
JPS6126132B2 JPS6126132B2 (en) 1986-06-19

Family

ID=12609616

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4148481A Granted JPS57158017A (en) 1981-03-20 1981-03-20 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57158017A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6083219A (en) * 1983-10-13 1985-05-11 Sekisui Chem Co Ltd Binder for magnetic recording body

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5184602A (en) * 1975-01-24 1976-07-24 Tdk Electronics Co Ltd JIKIKIRO KUTAI
JPS51144604A (en) * 1975-06-09 1976-12-11 Fuji Photo Film Co Ltd Magnetic recorder process
JPS549606A (en) * 1977-06-22 1979-01-24 Tdk Corp Magnetic recording medium
JPS5433705A (en) * 1977-08-18 1979-03-12 Hitachi Maxell Magnetic recording medium
JPS5446011A (en) * 1977-09-19 1979-04-11 Fuji Photo Film Co Ltd Magnetic recording medium
JPS5573928A (en) * 1978-11-30 1980-06-04 Tdk Corp Magnetic recording medium
JPS55122234A (en) * 1979-03-08 1980-09-19 Fuji Photo Film Co Ltd Magnetic recording medium

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5184602A (en) * 1975-01-24 1976-07-24 Tdk Electronics Co Ltd JIKIKIRO KUTAI
JPS51144604A (en) * 1975-06-09 1976-12-11 Fuji Photo Film Co Ltd Magnetic recorder process
JPS549606A (en) * 1977-06-22 1979-01-24 Tdk Corp Magnetic recording medium
JPS5433705A (en) * 1977-08-18 1979-03-12 Hitachi Maxell Magnetic recording medium
JPS5446011A (en) * 1977-09-19 1979-04-11 Fuji Photo Film Co Ltd Magnetic recording medium
JPS5573928A (en) * 1978-11-30 1980-06-04 Tdk Corp Magnetic recording medium
JPS55122234A (en) * 1979-03-08 1980-09-19 Fuji Photo Film Co Ltd Magnetic recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6083219A (en) * 1983-10-13 1985-05-11 Sekisui Chem Co Ltd Binder for magnetic recording body

Also Published As

Publication number Publication date
JPS6126132B2 (en) 1986-06-19

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