公开(公告)号：US20090127495A1

公开(公告)日：2009-05-21

申请号：US12273046

申请日：2008-11-18

Applicant: Nobuhiro JINGU ,  Mamoru SATOH ,  Kenichi KITAMURA ,  Megumi YOSHIMURA

Inventor： Nobuhiro JINGU ,  Mamoru SATOH ,  Kenichi KITAMURA ,  Megumi YOSHIMURA

IPC: H01F1/055

CPC classification number: H01F1/061 ,  G11B5/70621 ,  G11B5/712 ,  H01F1/0552

Abstract: The invention provides weather-resistant SmCo-based magnetic fine particles and a magnetic recording medium with both weather resistance and high recording density. The SmCo-based magnetic fine particles of the invention include SmCo-based nanoparticles and a hydrophobic polymer covering at least part of the surfaces of the SmCo-based nanoparticles. The magnetic recording medium of the invention also has a magnetic layer comprising at least SmCo-based magnetic fine particles and a hydrophobic binder, wherein the SmCo-based magnetic fine particles include SmCo-based nanoparticles and a hydrophobic polymer covering at least part of the SmCo-based nanoparticle surfaces.

Abstract translation: 本发明提供耐气候性SmCo系磁性微粒和具有耐候性和高记录密度的磁记录介质。 本发明的基于SmCo的磁性细颗粒包括SmCo基纳米颗粒和覆盖SmCo基纳米颗粒表面的至少一部分的疏水性聚合物。 本发明的磁记录介质还具有至少包含SmCo的磁性细颗粒和疏水性粘合剂的磁性层，其中SmCo基磁性微粒包括SmCo基纳米颗粒和覆盖至少部分SmCo的疏水性聚合物 的纳米颗粒表面。

公开(公告)号：US20100055500A1

公开(公告)日：2010-03-04

申请号：US12547799

申请日：2009-08-26

Applicant: Yoshiaki Nakagawa ,  Mamoru Satoh ,  Nobuhiro Jingu

Inventor： Yoshiaki Nakagawa ,  Mamoru Satoh ,  Nobuhiro Jingu

IPC: G11B5/33 ,  B32B1/00 ,  C01G49/02 ,  C01G23/04 ,  C09K11/78 ,  C01G53/04

CPC classification number: G11B5/82 ,  B82Y30/00 ,  C01B13/185 ,  C01G3/006 ,  C01G23/006 ,  C01G49/0018 ,  C01G53/42 ,  C01P2004/04 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/80 ,  G11B5/70642 ,  G11B5/714 ,  Y10T428/2982

Abstract: The invention provides a process for production of an oxide fine particle powder including a heating step in which a dry powder of a metal complex gel is heat treated to obtain an oxide fine particle powder, wherein the heating step is carried out in two stages with different oxygen concentrations, or at least part of the heating step is carried out in a water vapor-containing atmosphere.

Abstract translation: 本发明提供一种生产氧化物微粒粉末的方法，该方法包括加热步骤，其中热处理金属络合物凝胶的干燥粉末以获得氧化物细颗粒粉末，其中加热步骤分两步进行，具有不同的 氧浓度或至少部分加热步骤在含水蒸气的气氛中进行。

公开(公告)号：US20090136783A1

公开(公告)日：2009-05-28

申请号：US12276045

申请日：2008-11-21

Applicant: Nobuhiro Jingu ,  Mamoru Satoh ,  Kenichi Kitamura ,  Megumi Yoshimura

Inventor： Nobuhiro Jingu ,  Mamoru Satoh ,  Kenichi Kitamura ,  Megumi Yoshimura

IPC: B32B5/02 ,  B05D5/12

CPC classification number: G11B5/70621 ,  G11B5/712 ,  G11B5/842

Abstract: The invention provides a magnetic recording medium with both weather resistance and high recording density. The magnetic recording medium of the invention has a magnetic layer comprising at least SmCo-based magnetic fine particles and a hydrophobic binder, wherein the SmCo-based magnetic fine particles include a core composed of SmCo-based nanoparticles and a hydrophilic polymer covering at least a portion of the surface of the core.

Abstract translation: 本发明提供具有耐候性和高记录密度的磁记录介质。 本发明的磁记录介质具有至少含有SmCo系磁性微粒和疏水性粘合剂的磁性层，其中，SmCo系磁性微粒包括由SmCo系纳米颗粒构成的芯和至少覆盖 核心表面的一部分。

公开(公告)号：US20090142623A1

公开(公告)日：2009-06-04

申请号：US12276733

申请日：2008-11-24

Applicant: Nobuhiro JINGU ,  Mamoru Satoh ,  Kenichi Kitamura ,  Megumi Yoshimura

Inventor： Nobuhiro JINGU ,  Mamoru Satoh ,  Kenichi Kitamura ,  Megumi Yoshimura

IPC: G11B5/708

CPC classification number: G11B5/70621 ,  G11B5/712

Abstract: The present invention provides a magnetic recording medium capable of obtaining high recording density and also having a hardly charged magnetic layer. The magnetic recording tape 2 (magnetic recording medium) of a preferable embodiment has a magnetic layer 6 containing a SmCo magnetic fine particle 12 and a hydrophilic binder, wherein the SmCo magnetic fine particle 12 has a core 14 made of a SmCo nano particle and a coating layer 16 made of a hydrophilic polymer and coating at least a part of a surface of the core 14.

Abstract translation: 本发明提供能够获得高记录密度并且也具有几乎不带电的磁性层的磁记录介质。 优选实施例的磁记录带2（磁记录介质）具有含有SmCo磁性细颗粒12和亲水性粘结剂的磁性层6，其中SmCo磁性微粒12具有由SmCo纳米颗粒和 涂层16由亲水性聚合物制成并涂覆在芯14的表面的至少一部分上。