JPS5548833A - Magnetic recording media - Google Patents

Magnetic recording media

Info

Publication number
JPS5548833A
JPS5548833A JP12303778A JP12303778A JPS5548833A JP S5548833 A JPS5548833 A JP S5548833A JP 12303778 A JP12303778 A JP 12303778A JP 12303778 A JP12303778 A JP 12303778A JP S5548833 A JPS5548833 A JP S5548833A
Authority
JP
Japan
Prior art keywords
magnetic powder
powder
magnetic
scattered
transforming
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
JP12303778A
Other languages
Japanese (ja)
Inventor
Haruo Ando
Susumu Kitaoka
Toshinobu Sueyoshi
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 JP12303778A priority Critical patent/JPS5548833A/en
Publication of JPS5548833A publication Critical patent/JPS5548833A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To increase the copying and erasing characteristics by lowering the surface electric resistance through the use of mixture of magnetic powder transforming the surface of needle iron oxide magnetic powder with Co and magnetic powder transforming the surface of the said magnetic powder with Co and ferric oxide.
CONSTITUTION: The magnetic powder obtained with partial reduction of γ-Fe2O3 powder, coercive force 330 Oe, saturation magnetization 74emu/g, and particle diameter about 0.3μ for example, under hydrogen gas flow, is scattered in NaOH solution with cobalt sulfate, and the magnetic powder is picked up after treating at 100°C. The magnetic powder 40W80wt% including Co and the said γ-Fe2O3 powder are scattered in NaOH solution with cobalt sulfate and ferrous sulfate for the surface layer obtained from water cleaning and drying from the said powder. The magnetic paint including the mixture magnetic powder with the magnetic powder 60W20wt% formed with Co and ferric oxide for the surface obtained with similar treatment as the said surface, is painted on tape material to obtain magnetic tape. Thus, various electromagnetic conversion characteristics can be increased.
COPYRIGHT: (C)1980,JPO&Japio
JP12303778A 1978-10-04 1978-10-04 Magnetic recording media Pending JPS5548833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12303778A JPS5548833A (en) 1978-10-04 1978-10-04 Magnetic recording media

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12303778A JPS5548833A (en) 1978-10-04 1978-10-04 Magnetic recording media

Publications (1)

Publication Number Publication Date
JPS5548833A true JPS5548833A (en) 1980-04-08

Family

ID=14850639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12303778A Pending JPS5548833A (en) 1978-10-04 1978-10-04 Magnetic recording media

Country Status (1)

Country Link
JP (1) JPS5548833A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6371799A (en) * 1986-09-13 1988-04-01 松下電工株式会社 Crime prevention alarm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6371799A (en) * 1986-09-13 1988-04-01 松下電工株式会社 Crime prevention alarm

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