ES390894A3 - Method for manufacturing magnetizing particles. (Machine-translation by Google Translate, not legally binding) - Google Patents

Method for manufacturing magnetizing particles. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES390894A3
ES390894A3 ES390894A ES390894A ES390894A3 ES 390894 A3 ES390894 A3 ES 390894A3 ES 390894 A ES390894 A ES 390894A ES 390894 A ES390894 A ES 390894A ES 390894 A3 ES390894 A3 ES 390894A3
Authority
ES
Spain
Prior art keywords
cobalt
translation
particles
manufacturing
machine
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
Application number
ES390894A
Other languages
Spanish (es)
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to ES390894A priority Critical patent/ES390894A3/en
Publication of ES390894A3 publication Critical patent/ES390894A3/en
Expired legal-status Critical Current

Links

Landscapes

  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

Method for manufacturing magnetizable particles that can be combined with a non-magnetizable binder, to provide the magnetizable coating of a magnetic recording tape, said method comprising the steps of: (1) forming an intimate dry mixture of acicular gamma-Fe2O3 particles and a cobalt compound which decomposes on heating to form cobalt oxide, and (2) heating the mixture to a temperature and for a time sufficient to decompose the cobalt compound, forming cobalt oxide, and to modify the needle particles with the oxide of cobalt, at least 0.25% by weight of cobalt. (Machine-translation by Google Translate, not legally binding)
ES390894A 1971-05-05 1971-05-05 Method for manufacturing magnetizing particles. (Machine-translation by Google Translate, not legally binding) Expired ES390894A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES390894A ES390894A3 (en) 1971-05-05 1971-05-05 Method for manufacturing magnetizing particles. (Machine-translation by Google Translate, not legally binding)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES390894A ES390894A3 (en) 1971-05-05 1971-05-05 Method for manufacturing magnetizing particles. (Machine-translation by Google Translate, not legally binding)

Publications (1)

Publication Number Publication Date
ES390894A3 true ES390894A3 (en) 1973-11-16

Family

ID=8458319

Family Applications (1)

Application Number Title Priority Date Filing Date
ES390894A Expired ES390894A3 (en) 1971-05-05 1971-05-05 Method for manufacturing magnetizing particles. (Machine-translation by Google Translate, not legally binding)

Country Status (1)

Country Link
ES (1) ES390894A3 (en)

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