公开(公告)号：US20110244270A1

公开(公告)日：2011-10-06

申请号：US13077337

申请日：2011-03-31

申请人： Masataka YOSHIZAWA ,  Ayako MATSUMOTO ,  Satoshi MATSUBAGUCHI

发明人： Masataka YOSHIZAWA ,  Ayako MATSUMOTO ,  Satoshi MATSUBAGUCHI

IPC分类号： G11B5/702 ,  C08F220/06 ,  G11B5/714

CPC分类号： G11B5/7023 ,  C08F220/28 ,  C08F220/58 ,  C08F226/10 ,  C08F2220/1891 ,  G11B5/70678 ,  G11B5/714

摘要： An aspect of the present invention relates to a binder composition for a magnetic recording medium, which comprises a vinyl copolymer comprising a structural unit denoted by general formula [1]: wherein, in general formula [1], R1 denotes a hydrogen atom, a halogen atom, or a methyl group, L1 denotes a single bond or a divalent linking group, and Y an alicyclic group; a structural unit denoted by general formula [2]: wherein, in general formula [2], R2 denotes a hydrogen atom, a halogen atom, or a methyl group, L2 denotes a single bond or a divalent linking group, and Z denotes a hydrocarbon group with a carbon number ranging from 8 to 50; and a structural unit denoted by general formula [3]: wherein, in general formula [3], R3 denotes a hydrogen atom, a halogen atom, or a methyl group, and L3 denotes a single bond or a divalent linking group.

摘要翻译： 本发明的一个方面涉及一种用于磁记录介质的粘合剂组合物，其包含由通式[1]表示的结构单元的乙烯基共聚物：其中，通式[1]中，R 1表示氢原子， 卤原子或甲基，L1表示单键或二价连接基，Y表示脂环族基; 由通式[2]表示的结构单元：其中，通式[2]中，R 2表示氢原子，卤素原子或甲基，L 2表示单键或二价连接基，Z表示 碳数为8至50的烃基; 和由通式[3]表示的结构单元：其中，通式[3]中，R3表示氢原子，卤素原子或甲基，L3表示单键或二价连接基团。

公开(公告)号：US20090092857A1

公开(公告)日：2009-04-09

申请号：US12244556

申请日：2008-10-02

申请人： Ayako MATSUMOTO ,  Satoshi Matsubaguchi

发明人： Ayako MATSUMOTO ,  Satoshi Matsubaguchi

IPC分类号： G11B5/842 ,  G11B5/68

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/714 ,  G11B5/842 ,  G11B5/845

摘要： The present invention relates to a method of manufacturing a magnetic recording medium comprising coating a magnetic layer coating liquid comprising a ferromagnetic hexagonal ferrite powder and a binder to form a coating film, subjecting the coating film to orientation processing while the coating film is still wet, and drying the coating film to form a magnetic layer. The magnetic layer coating liquid is prepared by subjecting a ferromagnetic hexagonal ferrite powder with an average plate diameter of 10 to 50 nm to a dry comminution step, subjecting the ferromagnetic hexagonal ferrite powder to a first dispersion step together with a binder to prepare a dispersion liquid, and sequentially subjecting the dispersion liquid obtained to a second dispersion step and a filtering step. The dispersion liquid obtained by the first dispersion step comprises a dry solid component in an amount, as measured after filtration, of 15 percent or less.

摘要翻译： 磁记录介质的制造方法技术领域本发明涉及一种磁记录介质的制造方法，其特征在于，包括含有铁磁性六角铁氧体粉末和粘合剂的磁性层涂布液，形成涂膜，在涂膜仍然是湿的同时对涂膜进行取向处理， 并干燥涂膜以形成磁性层。 通过对平均板直径为10〜50nm的铁磁性六方晶系铁氧体粉末进行干式粉碎步骤，将铁磁六方铁氧体粉末与粘合剂一起进行第一分散工序，制备磁性层涂布液，制备分散液 依次对得到的分散液进行第二分散工序和过滤工序。 通过第一分散步骤获得的分散液含有在过滤后测得的干固体成分为15％或更低的量。