SURFACE-MODIFIED MAGNETIC POWDER PARTICLES OF IRON-BASED OXIDE, AND PRODUCTION PROCESS THEREFOR

WIPO Patent Application WO/2016/148092

A1

[Problem] To provide: surface-modified magnetic powder particles of an iron-based oxide which were good in solid-liquid separation in the production process, show satisfactory dispersibility in coating materials for forming magnetic recording media of the coating fluid application type, have satisfactory alignment properties, and are reduced in the dissolution of water-soluble alkali metals therefrom; and a process for producing the surface-modified magnetic powder particles of an iron-based oxide. [Solution] A solution of either trivalent iron ions or trivalent iron ions and metal ions for replacing some of the Fe sites is neutralized with an aqueous alkali solution to yield a precursor. The precursor is coated with a silicon oxide and then heated to obtain a magnetic powder of an ε-type iron-based oxide. A hydroxide or hydrous oxide of Al and/or Y ions is adhered to the obtained magnetic powder, thereby obtaining surface-modified magnetic powder particles of an iron-based oxide which are good in solid-liquid separation in the production process, show satisfactory dispersibility in coating materials, and are reduced in the dissolution of water-soluble alkali metals therefrom.

SAKANE KENJI (JP)
KAWAHITO TETSUYA (JP)

PCT/JP2016/057878

September 22, 2016

March 11, 2016

Click for automatic bibliography generation  

DOWA ELECTRONICS MATERIALS CO (JP)

C01G49/00; C01G51/00; G11B5/706; G11B5/712; G11B5/714; G11B5/84; H01F1/11

WO2007114455A1	2007-10-11
WO2014148502A1	2014-09-25
WO2012101752A1	2012-08-02

JP2008063200A	2008-03-21
JP2014216034A	2014-11-17

KOMATSU TAKASHI (JP)
Komatsu Quantity (JP)

View/Download PDF      PDF Help

Previous Patent: DECORATIVE PANEL AND MANUFACTURING METHOD FOR SAME

Next Patent: NOZZLE PLATE FOR FUEL INJECTION DEVICE