DE3039792C2 - - Google Patents

Info

Publication number
DE3039792C2
DE3039792C2 DE3039792A DE3039792A DE3039792C2 DE 3039792 C2 DE3039792 C2 DE 3039792C2 DE 3039792 A DE3039792 A DE 3039792A DE 3039792 A DE3039792 A DE 3039792A DE 3039792 C2 DE3039792 C2 DE 3039792C2
Authority
DE
Germany
Prior art keywords
magnetic
particles
magnetic layer
weight
amount
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.)
Expired - Lifetime
Application number
DE3039792A
Other languages
German (de)
English (en)
Other versions
DE3039792A1 (de
Inventor
Masaaki Yasui
Takeshi Kyoto Jp Matsuura
Seiji Osaka Jp Watatani
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 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
Publication of DE3039792A1 publication Critical patent/DE3039792A1/de
Application granted granted Critical
Publication of DE3039792C2 publication Critical patent/DE3039792C2/de
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
    • G11B5/708—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 addition of non-magnetic particles to the layer
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof
    • Y10T428/257—Iron oxide or aluminum oxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31609—Particulate metal or metal compound-containing

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
DE19803039792 1979-10-24 1980-10-22 Magnetisches aufzeichnungsmaterial Granted DE3039792A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13735279A JPS5661035A (en) 1979-10-24 1979-10-24 Magnetic recording medium

Publications (2)

Publication Number Publication Date
DE3039792A1 DE3039792A1 (de) 1981-05-07
DE3039792C2 true DE3039792C2 (en, 2012) 1991-06-20

Family

ID=15196637

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803039792 Granted DE3039792A1 (de) 1979-10-24 1980-10-22 Magnetisches aufzeichnungsmaterial

Country Status (3)

Country Link
US (1) US4363850A (en, 2012)
JP (1) JPS5661035A (en, 2012)
DE (1) DE3039792A1 (en, 2012)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57150129A (en) * 1981-03-12 1982-09-16 Fuji Photo Film Co Ltd Magnetic recording medium
JPS58203625A (ja) * 1982-05-24 1983-11-28 Toshiba Corp 磁気記録媒体
US4550054A (en) * 1982-10-29 1985-10-29 Konishiroku Photo Industry Co., Ltd. Magnetic recording medium
US4476257A (en) * 1983-02-24 1984-10-09 Asahi Kasei Kogyo Kabushiki Kaisha Magnetic coating composition of partially oxidized nitrocellulose and magnetic powder
US4643949B1 (en) * 1983-04-08 1993-05-18 The B.F. Goodrich Company Magnetic recording tape
US4568619A (en) * 1983-06-09 1986-02-04 E. I. Du Pont De Nemours And Company Nonmagnetic particles to improve properties of magnetic recording compositions
JPS6042804A (ja) * 1983-08-18 1985-03-07 Hitachi Maxell Ltd 磁気記録媒体及び磁気記録媒体用磁性粉末
US4748081A (en) * 1985-02-23 1988-05-31 Victor Company Of Japan, Ltd. Magnetic recording medium having an improved magnetic layer using particulate alpha-Fe2 O3 and carbon black
US4668415A (en) * 1986-02-12 1987-05-26 E. I. Du Pont De Nemours And Company Facilitation of orientation of thermotropic polymers in a magnetic field
US4952444A (en) * 1986-03-14 1990-08-28 Fuji Photo Film Co., Ltd. Magnetic recording medium
US5397826A (en) * 1993-12-22 1995-03-14 Eastman Kodak Company Coating compositions for a transparent magnetic recording layer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049871A (en) * 1973-08-17 1977-09-20 Fuji Photo Film Co., Ltd. Magnetic recording material
US4115290A (en) * 1976-05-24 1978-09-19 Tdk Electronics Co., Ltd. Magnetic recording medium
GB2008307B (en) * 1977-11-16 1982-05-19 Hitachi Maxell Magnetic recording medium
JPS54143608A (en) * 1978-04-29 1979-11-09 Victor Co Of Japan Ltd Magnetic recording medium

Also Published As

Publication number Publication date
DE3039792A1 (de) 1981-05-07
JPS5661035A (en) 1981-05-26
US4363850A (en) 1982-12-14

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee