JPS57135439A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57135439A
JPS57135439A JP1990581A JP1990581A JPS57135439A JP S57135439 A JPS57135439 A JP S57135439A JP 1990581 A JP1990581 A JP 1990581A JP 1990581 A JP1990581 A JP 1990581A JP S57135439 A JPS57135439 A JP S57135439A
Authority
JP
Japan
Prior art keywords
acrylic acid
butyl acrylate
surface area
recording medium
magnetic recording
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
JP1990581A
Other languages
Japanese (ja)
Inventor
Yasuyuki Yamada
Nobuo Tsuji
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP1990581A priority Critical patent/JPS57135439A/en
Publication of JPS57135439A publication Critical patent/JPS57135439A/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
    • G11B5/7023—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

Abstract

PURPOSE:To raise an S/N ratio and to improve an abrasion resistance, by coating ferromagnetic fine powder having a specified specific surface area with butyl acrylate acrylic acid compound oligomer, and dispersing it in a binder consisting of a specific component. CONSTITUTION:The surface of ferromagnetic powder whose specific surface area by a BET surface area measuring method of gamma-Fe2O3, etc. is >=30m<2>/g is coated with butyl acrylate acrylic acid compound oligomer which is <=1,500 in its number mean molecular weight, and contains 3 or less COOH radicals whose copolymerization ratio is 70-98mol% butyl acrylate and 2-30mol% acrylic acid, and the coated magnetic powder concerned is dispersed to a binder containing nitrocellulose and polyurethane resin, by which a magnetic recording medium is obtained.
JP1990581A 1981-02-13 1981-02-13 Magnetic recording medium Pending JPS57135439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1990581A JPS57135439A (en) 1981-02-13 1981-02-13 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1990581A JPS57135439A (en) 1981-02-13 1981-02-13 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57135439A true JPS57135439A (en) 1982-08-21

Family

ID=12012223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1990581A Pending JPS57135439A (en) 1981-02-13 1981-02-13 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57135439A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112924A1 (en) * 1982-07-01 1984-07-11 Sony Corporation Magnetic recording medium
JPS619826A (en) * 1984-06-25 1986-01-17 Konishiroku Photo Ind Co Ltd Magnetic recording medium
US4614685A (en) * 1983-04-08 1986-09-30 Fuji Photo Film Co., Ltd. Magnetic recording medium having improved running properties
GB2238648A (en) * 1989-11-10 1991-06-05 Tdk Corp Magnetic tape cartridge

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112924A1 (en) * 1982-07-01 1984-07-11 Sony Corporation Magnetic recording medium
US4614685A (en) * 1983-04-08 1986-09-30 Fuji Photo Film Co., Ltd. Magnetic recording medium having improved running properties
JPS619826A (en) * 1984-06-25 1986-01-17 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPH0576688B2 (en) * 1984-06-25 1993-10-25 Konishiroku Photo Ind
GB2238648A (en) * 1989-11-10 1991-06-05 Tdk Corp Magnetic tape cartridge
US5172288A (en) * 1989-11-10 1992-12-15 Tdk Corporation Magnetic recording medium and a tape guide in a cartridge
GB2238648B (en) * 1989-11-10 1994-08-10 Tdk Corp Magnetic tape cartridge

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