公开(公告)号：US20130260179A1

公开(公告)日：2013-10-03

申请号：US13838996

申请日：2013-03-15

Applicant: FUJIFILM CORPORATION

Inventor： Norihito KASADA ,  Masahide SATO ,  Isamu WATANABE

IPC: G11B5/708 ,  G11B5/842

CPC classification number: G11B5/7085 ,  G11B5/70 ,  G11B5/7013 ,  G11B5/842

Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the nonmagnetic layer has a thickness of equal to or less than 300 nm; a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; the magnetic layer comprises an abrasive with a specific surface area by BET method ranging from 14 m2/g to 40 m2/g; and a surface abrasive occupancy on a surface of the magnetic layer ranges from 0.2% to 2%.

Abstract translation: 本发明的一个方面涉及一种磁记录介质，其在非磁性载体上依次包括含有非磁性粉末和粘合剂的非磁性层和含有铁磁粉末和粘合剂的磁性层，其中非磁性层具有 等于或小于300nm的厚度; 在磁性层表面测得的复合弹性模量为6.0-8.0GPa; 磁性层包括通过BET法测量的比表面积为14m 2 / g至40m 2 / g的研磨剂; 在磁性层的表面上的表面磨料占有率为0.2％〜2％。

公开(公告)号：US20170092316A1

公开(公告)日：2017-03-30

申请号：US15280165

申请日：2016-09-29

Applicant: FUJIFILM Corporation

Inventor： Mika IMAMURA ,  Toshihide AOSHIMA ,  Isamu WATANABE

IPC: G11B5/842 ,  G11B5/702 ,  G11B5/706 ,  G11B5/70 ,  H01F1/44 ,  H01F1/03

CPC classification number: G11B5/842 ,  G11B5/7013 ,  G11B5/7021 ,  G11B5/70605 ,  G11B5/7085 ,  H01F1/0315 ,  H01F1/445

Abstract: The metal oxide particle dispersion for manufacturing a particulate magnetic recording medium contains metal oxide particles, solvent, and a polyester compound having one or more groups selected from the group consisting of a carboxyl group and a salt thereof, a phosphoric acid group and a salt thereof, a hydroxyl group and a nitrogen-substituted alkylene group, but substantially not containing ferromagnetic powder.