公开(公告)号：US20110229741A1

公开(公告)日：2011-09-22

申请号：US13051765

申请日：2011-03-18

申请人： Masahide SATO ,  Katsumi ARAKI ,  Kazufumi OMURA ,  Tomohiro ICHIKAWA ,  Shinji TSUJIMOTO ,  Tadahiro OOISHI

发明人： Masahide SATO ,  Katsumi ARAKI ,  Kazufumi OMURA ,  Tomohiro ICHIKAWA ,  Shinji TSUJIMOTO ,  Tadahiro OOISHI

IPC分类号： G11B5/702 ,  G11B5/84 ,  B05D3/06 ,  B05D3/02

CPC分类号： G11B5/7022 ,  G11B5/7013 ,  G11B5/7026 ,  G11B5/714 ,  G11B5/842

摘要： An aspect of the present invention relates to a magnetic recording medium comprising 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 binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.

摘要翻译： 本发明的一个方面涉及一种在非磁性载体上依次包含含有非磁性粉末和粘合剂的非磁性层和含有铁磁性粉末和粘合剂的磁性层的磁记录介质，其中磁性层的粘结剂为 氯乙烯共聚物，聚氨酯树脂和多异氰酸酯的混合物，所述聚氨酯树脂的玻璃化转变温度为90〜130℃，80℃下的储能弹性模量为2.5〜5.0GPa，非磁性层 是通过用辐射固化形成的辐射固化层，所述辐射固化组合物包含非磁性粉末和粘合剂组分，所述粘合剂组分包含可辐射固化的氯乙烯共聚物和可辐射固化的聚氨酯树脂，以及所述可辐射固化的乙烯基 氯化物共聚物和可辐射固化的聚氨酯树脂都具有30至100℃的玻璃化转变温度。

公开(公告)号：US20090098414A1

公开(公告)日：2009-04-16

申请号：US12240406

申请日：2008-09-29

申请人： Tadahiro OOISHI ,  Kazufumi Omura ,  Hitoshi Noguchi ,  Hiroaki Takano

发明人： Tadahiro OOISHI ,  Kazufumi Omura ,  Hitoshi Noguchi ,  Hiroaki Takano

IPC分类号： G11B5/706 ,  B05D5/00

CPC分类号： G11B5/7021 ,  G11B5/7013 ,  G11B5/714 ,  G11B5/842

摘要： The present invention relates to a method of manufacturing a magnetic recording medium wherein the magnetic layer coating liquid comprising a ferromagnetic powder having an average particle size of 10 to 40 nm and a moisture content of 0.3 to 3.0 weight percent; a binder (a) comprising 0.2 to 0.7 meq/g of at least one polar group selected from the group consisting of —SO3M, —OSO3M, —PO(OM)2, —OPO(OM)2, and COOM (M denotes a hydrogen atom or the like) and having a weight average molecular weight of 20,000 to 200,000, and/or (b) comprising 0.5 to 5 meq/g of at least one polar group selected from the group consisting of —CONR1R2, —NR1R2, and —NR+R1R2R3 (wherein R1, R2, and R3 each independently denote a hydrogen atom or the like) and having a weight average molecular weight of 20,000 to 200,000; and a compound comprising at least one carboxyl group and/or hydroxyl group per molecule.

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制造磁记录介质的方法，其中所述磁性层涂布液含有平均粒度为10〜40nm，水分含量为0.3〜3.0重量％的铁磁性粉末; 包含0.2至0.7meq / g的至少一种选自-SO 3 M，-OSO 3 M，-PO（OM）2，-OPO（OM）2和COOM的极性基团的粘合剂（a）（M表示 氢原子等），重均分子量为20,000〜200,000，和/或（b）含有0.5〜5meq / g的至少一种极性基团，选自-CONR1R2，-NR1R2和 -NR + R1R2R3（其中R1，R2和R3各自独立地表示氢原子等），重均分子量为20,000〜200,000; 和每分子含有至少一个羧基和/或羟基的化合物。