公开(公告)号：US20140322437A1

公开(公告)日：2014-10-30

申请号：US14329003

申请日：2014-07-11

Applicant: TODA KOGYO CORPORATION

Inventor： Seiji ISHITANI ,  Hiroko MORII ,  Kazuyuki HAYASHI

IPC: G11B5/84

CPC classification number: G11B5/8404 ,  B82Y30/00 ,  C01G49/06 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/80 ,  C04B35/62675 ,  C04B35/62802 ,  C04B35/62807 ,  C04B35/62813 ,  C04B35/62815 ,  C04B35/62894 ,  C04B2235/3272 ,  C04B2235/5276 ,  C04B2235/5296 ,  C04B2235/5409 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/72 ,  C09C1/24 ,  G11B5/73 ,  Y10T428/2991

Abstract: The present invention relates to non-magnetic particles for non-magnetic undercoat layer of magnetic recording medium, comprising: hematite particles; an inner coating layer comprising a phosphorus-containing inorganic compound which is formed on a surface of the respective hematite particles; and an outer coating layer comprising an aluminum-containing inorganic compound which is formed on an outside of the inner coating layer comprising the phosphorus-containing inorganic compound.

Abstract translation: 本发明涉及磁记录介质的非磁性底涂层的非磁性颗粒，其包括：赤铁矿颗粒; 包含在各赤铁矿颗粒的表面上形成的含磷无机化合物的内涂层; 以及包含含铝无机化合物的外涂层，其形成在包含含磷无机化合物的内涂层的外侧。