JPS57158028A - High density magnetic recording medium - Google Patents

High density magnetic recording medium

Info

Publication number
JPS57158028A
JPS57158028A JP56040466A JP4046681A JPS57158028A JP S57158028 A JPS57158028 A JP S57158028A JP 56040466 A JP56040466 A JP 56040466A JP 4046681 A JP4046681 A JP 4046681A JP S57158028 A JPS57158028 A JP S57158028A
Authority
JP
Japan
Prior art keywords
recording medium
fatty acid
magnetic recording
glycerol ester
high density
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
JP56040466A
Other languages
Japanese (ja)
Inventor
Fujio Shibata
Hiroshi Kawahara
Hitoshi Azegami
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 JP56040466A priority Critical patent/JPS57158028A/en
Priority to DE19823210417 priority patent/DE3210417A1/en
Publication of JPS57158028A publication Critical patent/JPS57158028A/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
    • G11B5/7013—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 dispersing agent

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE: To obtain a high-density recording medium by adding glycerol ester of fatty acid to the magnetic layer of a magnetic recording medium.
CONSTITUTION: When extremely fine ferromagnetic material powder is kneaded with a binder vehicle, glycerol ester of fatty acid is added to the binder vehicle to obtain uniform dispersibility and also to smoothen a magnetic coating. To obtain large effect, glycerol ester of fatty acid having 12W22 carbon number is used. As fatty acid, stearic acid, or stearic acid and oleic acid are suitable. Thus, a magnetic recording medium suitabe for high-density recording is obtained.
COPYRIGHT: (C)1982,JPO&Japio
JP56040466A 1981-03-23 1981-03-23 High density magnetic recording medium Pending JPS57158028A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56040466A JPS57158028A (en) 1981-03-23 1981-03-23 High density magnetic recording medium
DE19823210417 DE3210417A1 (en) 1981-03-23 1982-03-22 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56040466A JPS57158028A (en) 1981-03-23 1981-03-23 High density magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57158028A true JPS57158028A (en) 1982-09-29

Family

ID=12581405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56040466A Pending JPS57158028A (en) 1981-03-23 1981-03-23 High density magnetic recording medium

Country Status (2)

Country Link
JP (1) JPS57158028A (en)
DE (1) DE3210417A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60136034A (en) * 1983-12-23 1985-07-19 Sony Corp Magnetic recording medium
JPS61156522A (en) * 1984-12-27 1986-07-16 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPS61156521A (en) * 1984-12-27 1986-07-16 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPS61214217A (en) * 1985-03-20 1986-09-24 Kao Corp Magnetic recording medium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107385A (en) * 1972-08-14 1978-08-15 Sony Corporation Magnetic recording medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60136034A (en) * 1983-12-23 1985-07-19 Sony Corp Magnetic recording medium
JPS61156522A (en) * 1984-12-27 1986-07-16 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPS61156521A (en) * 1984-12-27 1986-07-16 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPH0531211B2 (en) * 1984-12-27 1993-05-12 Konishiroku Photo Ind
JPS61214217A (en) * 1985-03-20 1986-09-24 Kao Corp Magnetic recording medium

Also Published As

Publication number Publication date
DE3210417A1 (en) 1982-09-30

Similar Documents

Publication Publication Date Title
JPS5586103A (en) High density magnetic recording unit
JPS52122213A (en) Production of ferromagnetic metal powder
JPS55105253A (en) Magnetic developer and its preparation
JPS545417A (en) Magnetic head
JPS57158028A (en) High density magnetic recording medium
JPS5661101A (en) Magnetic recording medium
GB1100610A (en) Magnetic recording medium and method of making same
JPS57183624A (en) Magnetic recording medium
JPS5315802A (en) High density magnetic recording material
JPS57158027A (en) High density magnetic recording medium
EP0075991A3 (en) Magnetic recording medium and method for the production thereof
JPS5570936A (en) Magnetic recording media
JPS5413997A (en) Magnetic recording medium and its manufacture
JPS5613519A (en) Magnetic recording medium
JPS57130230A (en) Manufacture of magnetic recording material
JPS5651027A (en) Magnetic recording medium
JPS5584041A (en) Magnetic recording medium
JPS5629840A (en) Magnetic recording medium
JPS57158030A (en) Magnetic recording medium
JPS57158026A (en) Magnetic recording medium
JPS5597407A (en) Preparation of needle crystal metallic iron magnetic particulate powder
JPS6484431A (en) Magnetic disk
JPS5573803A (en) Production of magnetic alloy powder
JPS53115696A (en) Method for producing iron oxide powder
JPS54103005A (en) Magnetic disc coating composite