JPS5525855A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS5525855A
JPS5525855A JP9849978A JP9849978A JPS5525855A JP S5525855 A JPS5525855 A JP S5525855A JP 9849978 A JP9849978 A JP 9849978A JP 9849978 A JP9849978 A JP 9849978A JP S5525855 A JPS5525855 A JP S5525855A
Authority
JP
Japan
Prior art keywords
powder
iron oxide
magnetic
iron
ferrous
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
JP9849978A
Other languages
Japanese (ja)
Inventor
Haruo Ando
Susumu Kitaoka
Toshinobu Sueyoshi
Hikari Ishida
Akira Kato
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 JP9849978A priority Critical patent/JPS5525855A/en
Publication of JPS5525855A publication Critical patent/JPS5525855A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain the excellent electromagnetic property as well as to reduce the electrification property by using together both the magnetic iron oxide powder containing a specified amount of the ferrous iron and the Co-containing iron oxide magnetic powder featuring the higher coercive force than the magnetic iron oxide powder by 0W100 Oe.
CONSTITUTION: The γ-Fe2O3 powder is dispersed into the aqueous solution containing the Co salt, the ferrous salt and the equivalent alkali and the treated at the temperature lower than the boiling point of the dispersion solution. Thus the iron oxide layer containing Co and ferrous iron is formed on the iron oxide magnetic powder. Then the mixture magnetic powder composed of 70W97 parts by weight of the Co- containing iron oxide magnetic powder and 3W30 parts by weight of the magnetic iron oxide powder which contains the ferrous iron in the ratio of over 0.05 for specific Fe2+/Fe3+ between the ferrous iron and the ferric iron in the powder particle is coated on the substrate along with the bonding agent. In this case, the Co-containing iron oxide magnetic powder featuring the higher coercive force than the ferrous iron-containing magnetic iron oxide powder by 0W100 Oe is applied.
COPYRIGHT: (C)1980,JPO&Japio
JP9849978A 1978-08-11 1978-08-11 Magnetic recording medium Pending JPS5525855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9849978A JPS5525855A (en) 1978-08-11 1978-08-11 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9849978A JPS5525855A (en) 1978-08-11 1978-08-11 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS5525855A true JPS5525855A (en) 1980-02-23

Family

ID=14221322

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9849978A Pending JPS5525855A (en) 1978-08-11 1978-08-11 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5525855A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6117221A (en) * 1984-06-25 1986-01-25 Konishiroku Photo Ind Co Ltd Magnetic recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6117221A (en) * 1984-06-25 1986-01-25 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPH0576691B2 (en) * 1984-06-25 1993-10-25 Konishiroku Photo Ind

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