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1. 发明授权

US06767613B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06767613B2
公开(公告)日：2004-07-27
申请号：US10265709
申请日：2002-10-08
申请人： Yuichiro Murayama , Hiroshi Hashimoto
发明人： Yuichiro Murayama , Hiroshi Hashimoto
IPC分类号： G11B5702
CPC分类号： G11B5/716 , G11B5/7021 , G11B5/706 , Y10T428/24975 , Y10T428/256 , Y10T428/257 , Y10T428/31605 , Y10T428/31609
摘要： Disclosed are magnetic recording media having excellent running durability and electromagnetic characteristics and comprising a lower layer comprising a magnetic powder or nonmagnetic powder and a binder and one or more upper magnetic layers comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. In one mode, at least said lower layer comprises a binder comprising polyurethane resin having a glass transition temperature ranging from 100 to 200° C., and a magnetic layer positioned as the topmost layer among said upper magnetic layers comprises 5 to 1,000 surface protrusions of 10 to 20 nm in height per 100 &mgr;m2 on the surface thereof. In another mode, at least a magnetic layer positioned as the topmost layer among said upper magnetic layers comprises a binder comprising polyurethane resin having a glass transition temperature ranging from 100 to 200° C., and said magnetic layer positioned as the topmost layer among the upper magnetic layers comprises 5 to 1,000 surface protrusions of 10 to 20 nm in height per 100 &mgr;m2 on the surface thereof.
摘要翻译：公开了具有优异的运行耐久性和电磁特性的磁记录介质，并且包括在非磁性载体上依次包含磁性粉末或非磁性粉末和粘合剂的下层和包含铁磁粉末和粘合剂的一个或多个上磁性层。在一种模式中，至少所述下层包括含有玻璃化转变温度为100-200℃的聚氨酯树脂的粘合剂，并且位于所述上部磁性层中最上层的磁性层包含5至1,000个表面突起在其表面上每100微米2高10至20纳米。在另一种模式中，至少位于所述上部磁性层中的最上层的磁性层包括含有玻璃化转变温度为100-200℃的聚氨酯树脂的粘合剂，并且位于最上层之间的所述磁性层位于上磁性层包括表面上每100微米2的高度为10〜20nm的5〜1000个表面突起。

2. 发明授权

US06780503B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06780503B2
公开(公告)日：2004-08-24
申请号：US10281947
申请日：2002-10-29
申请人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
发明人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
IPC分类号： G11B5702
CPC分类号： G11B5/7021 , G11B5/7023 , G11B5/70678 , G11B5/7085 , G11B5/714 , Y10T428/256 , Y10T428/31609
摘要： A magnetic recording medium comprising: a nonmagnetic support; and at least one magnetic layer comprising a ferromagnetic hexagonal ferrite powder and a binder, wherein the magnetic layer comprises diamond particles having an average particle size of 0.03 to 0.5 &mgr;m in a ratio of 0.1 to 5% by weight to the ferromagnetic hexagonal ferrite powder, the ferrite hexagonal ferrite powder has an average tabular diameter of 5 to 40 nm, and the binder is at least one of: (i) a binder comprising from 0.2 to 0.7 meq/g of at least one polar group selected from —SO3M, —OSO3M, —PO(OM)2, —OPO(OM)2 and —COOM, wherein M represents a hydrogen atom, an alkali metal or ammonium, and (ii) a binder comprising from 0.5 to 5 meq/g of at least one polar group selected from —CONR1R2, —NR1R2 and —N+R1R2R3 wherein R1, R2 and R3 each independently represents a hydrogen atom or an alkyl group.
摘要翻译：一种磁记录介质，包括：非磁性载体; 以及包含铁磁性六角铁氧体粉末和粘合剂的至少一个磁性层，其中所述磁性层包含平均粒度为0.03-0.5μm，相对于铁磁性六角铁氧体粉末为0.1-5wt％的金刚石颗粒，所述铁氧体六角铁氧体粉末的平均片状直径为5〜40nm，所述粘合剂为以下中的至少一种：（i）包含0.2〜0.7meq / g的至少一种选自-SO 3 M， OSO3M，-PO（OM）2，-OPO（OM）2和-COOM，其中M表示氢原子，碱金属或铵，和（ii）包含0.5-5meq / g至少一种选自-CONR1R2，-NR1R2和-N + R1R2R3的极性基团，其中R1，R2和R3各自独立地表示氢原子或烷基。

3. 发明授权

US06472063B1 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06472063B1
公开(公告)日：2002-10-29
申请号：US09660504
申请日：2000-09-12
申请人： Shigeharu Watase
发明人： Shigeharu Watase
IPC分类号： G11B5702
CPC分类号： G11B5/7022 , G11B5/7023 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium comprising at least a lower non-magnetic layer containing at least a non-magnetic powders and a binder resin formed on a non-magnetic support and an upper magnetic layer formed on the lower non-magnetic layer, wherein the magnetic recording medium is used for a recording-reproducing system in which recorded signals are reproduced by an MR head, and a plastic deformation hardness Hv from the upper magnetic layer surface to an indentation depth of 0.1 &mgr;m is 100 to 200 mgf/&mgr;m2and a Young's modulus E in a thickness direction from the upper magnetic layer surface to the indentation depth of 0.1 &mgr;m is 2000 to 3000 mgf/&mgr;m2.
摘要翻译：一种磁记录介质，其至少包含至少含有非磁性粉末和形成在非磁性载体上的粘合剂树脂的下部非磁性层和形成在下部非磁性层上的上部磁性层，其中磁性记录介质用于通过MR磁头再现记录信号的记录再现系统，并且从上磁性层表面到压痕深度为0.1μm的塑性变形硬度Hv为100至200mgf / mum2，杨氏模量E 在从上磁性层表面到压痕深度为0.1μm的厚度方向上为2000〜3000mgf / mum2。

4. 发明授权

US06517942B1 Magnetic recording medium and manufacturing method thereof 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US06517942B1
公开(公告)日：2003-02-11
申请号：US09698680
申请日：2000-10-27
申请人： Toshitsugu Ono , Tomohiro Sato , Yuji Aoyama
发明人： Toshitsugu Ono , Tomohiro Sato , Yuji Aoyama
IPC分类号： G11B5702
CPC分类号： G11B5/7022 , G11B5/7021 , Y10S428/90 , Y10T428/31609
摘要： A magnetic recording medium includes a magnetic layer, main components of which are magnetic powder and a binder, and a non-magnetic substrate on which the magnetic layer is formed. The binder is a polyurethane resin including a propanediol derivative expressed by the following general formula as an ingredient. The polyurethane resin has a urethane group concentration of 4,000 or more equivalents per 1 t of the resin, and a glass transition temperature of 100° C. or more, preferably, where either or both of R1 and R2 in the general formula is a saturated hydrocarbon group having a carbon number of 2 to 8 and the remnant is a saturated hydrocarbon.
摘要翻译：磁记录介质包括磁性层，其主要成分是磁性粉末和粘结剂，以及形成有磁性层的非磁性基板。粘合剂是包含由以下通式表示的丙二醇衍生物作为成分的聚氨酯树脂。聚氨酯树脂的氨基甲酸酯基浓度为每1吨树脂4000当量以上，玻璃化转变温度为100℃以上，优选为通式中的R 1和R 2均为饱和的碳数为2〜8的烃基，残留物为饱和烃。

5. 发明授权

US06224967B1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06224967B1
公开(公告)日：2001-05-01
申请号：US09082730
申请日：1998-05-21
申请人： Yuichiro Murayama , Katsuhiko Meguro , Hiroshi Hashimoto
发明人： Yuichiro Murayama , Katsuhiko Meguro , Hiroshi Hashimoto
IPC分类号： G11B5702
CPC分类号： G11B5/7021 , G11B5/7022 , G11B5/70621 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/31609
摘要： The present invention provides a magnetic recording medium having high electromagnetic transfer characteristics and good running durability, whereby a polyester polyol comprising an aliphatic dibasic acid and an aliphatic diol component having no cyclic structure is used as a binder, and a polyurethane is contained, which comprises a polyester polyol having an aliphatic diol where 70 mol % or more of the aliphatic diol has alkyl branched side chain having 2 or more carbon atoms, and said polyurethane has urethane group concentration of 3.0 to 4.0 mmol/g, and said ferromagnetic powder has iron with yttrium at a yttrium/iron ratio of 0.5 to 20 atomic % as a major component.
摘要翻译：本发明提供具有高电磁转移特性和良好的运行耐久性的磁记录介质，由此使用包含脂族二元酸和不具有环状结构的脂族二醇组分的聚酯多元醇作为粘合剂，并且包含聚氨酯，其包含具有脂肪族二醇的聚酯多元醇，其中70摩尔％以上的脂肪族二醇具有碳原子数2以上的烷基支链侧链，所述聚氨酯的氨基甲酸酯基浓度为3.0〜4.0摩尔/克，所述铁磁粉末为铁钇/铁比为0.5〜20原子％的钇为主要成分。

6. 发明授权

US06565964B1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06565964B1
公开(公告)日：2003-05-20
申请号：US09094496
申请日：1998-06-10
申请人： Yuichiro Murayama , Katsuhiko Meguro , Hiroshi Hashimoto
发明人： Yuichiro Murayama , Katsuhiko Meguro , Hiroshi Hashimoto
IPC分类号： G11B5702
CPC分类号： G11B5/7021 , G11B5/70615 , Y10T428/25 , Y10T428/31609
摘要： The present invention provides a magnetic recording medium, which comprises at least one magnetic layer where ferromagnetic powder and a binder are dispersed, and said magnetic layer is placed on a non-magnetic support, whereby said binder comprises a polyurethane resin obtained through reaction of polytetramethylene glycol and short-chain diol having cyclic structure or short-chain diol having a branched side chain containing two or more carbon atoms, said polytetramethylene glycol is contained in said polyurethane resin in an amount of 35 to 60 weight %, said short-chain diol is contained in said polyurethane resin in an amount of 10 to 40 weight %, and glass transition temperature of said polyurethane resin is within the range of 30° C. to 120° C.
摘要翻译：本发明提供一种磁记录介质，其包括至少一个分散有铁磁性粉末和粘合剂的磁性层，并且将所述磁性层放置在非磁性载体上，由此所述粘合剂包括通过聚四亚甲基具有环状结构的二醇和短链二醇或具有两个或更多个碳原子的支链侧链的短链二醇，所述聚丁二醇在所述聚氨酯树脂中的含量为35〜60重量％，所述短链二醇以10-40重量％的量包含在所述聚氨酯树脂中，并且所述聚氨酯树脂的玻璃化转变温度在30℃至120℃的范围内。

7. 发明授权

US06500551B1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06500551B1
公开(公告)日：2002-12-31
申请号：US09509024
申请日：2000-03-21
申请人： Hiroshi Hashimoto , Yuichiro Murayama , Katsuhiko Meguro
发明人： Hiroshi Hashimoto , Yuichiro Murayama , Katsuhiko Meguro
IPC分类号： G11B5702
CPC分类号： G11B5/716 , C08G18/0828 , C08G18/3206 , C08G18/3212 , C08G18/3234 , C08G18/4233 , C08G18/4238 , G11B5/7021 , Y10S428/90 , Y10T428/31609
摘要： The magnetic recording medium of the invention comprises a substrate and a magnetic layer stacked thereon and composed of a dispersion of a ferromagnetic powder in a binder, and is characterized in that the binder contains a polyurethane resin 1 obtained by polymerization of a diol compound having a cyclic structure and a long-chain form of alkyl chain with a diisocyanate compound. Preferably, the polyurethane resin contains as diol components a dimer diol and an aliphatic diol having a medium-chain form of alkyl branched chain. The polyurethane resin may comprise a polyether polyol having a cyclic structure. A dibasic acid in the polyester polyol may contain an aliphatic dibasic acid, the diol component may contain an aliphatic diol that does not include a cyclic structure having an alkyl branched chain, and an chain extender may include a polyester polyol comprising an aliphatic diol having an alkyl branched chain.
摘要翻译：本发明的磁记录介质包括基板和层叠在其上的磁性层，由铁磁粉末在粘合剂中的分散体组成，其特征在于，所述粘合剂含有聚氨酯树脂1，其通过聚合具有环状结构和长链形式的烷基链与二异氰酸酯化合物。优选地，聚氨酯树脂作为二醇组分含有二聚体二醇和具有中链链烷基支链的脂肪族二醇。聚氨酯树脂可以包含具有环状结构的聚醚多元醇。聚酯多元醇中的二元酸可以含有脂族二元酸，二醇成分可以含有不包含具有烷基支链的环状结构的脂族二醇，扩链剂可以包含含有脂肪族二醇的聚酯多元醇，烷基支链。

8. 发明授权

US06623849B2 Magnetic recording medium 失效
公开(公告)号：US06623849B2
公开(公告)日：2003-09-23
申请号：US09866091
申请日：2001-05-25
申请人： Katsuhiko Meguro , Hiroshi Hashimoto
发明人： Katsuhiko Meguro , Hiroshi Hashimoto
IPC分类号： G11B5702
CPC分类号： G11B5/70621 , G11B5/7022 , G11B5/7023 , G11B5/70678 , G11B5/733 , Y10T428/256 , Y10T428/257 , Y10T428/265 , Y10T428/31855
摘要： A magnetic recording medium comprises: a support; an underlayer containing a non-magnetic powder and a binder; and at least one magnetic layer containing a binder and one of a ferromagnetic metal powder having an average major axis of 0.01 &mgr;m to 0.10 &mgr;m and a crystallite size of 80 Å to 180 Å and a ferromagnetic hexagonal ferrite powder having an average tabular diameter of 5 nm to 40 nm, wherein the magnetic layer has a thickness of 0.01 &mgr;m to 0.5 &mgr;m, and the binder in the magnetic layer comprises a (meth)acrylate copolymer having hydrophilic polar groups and comprising 0 to 75% by weight of alkyl (meth)acrylate units, 5 to 80% by weight of benzene ring-containing (meth)acrylate units and 1 to 75% by weight of nitrogen-containing radical polymerizable monomer units.

9. 发明授权

US06579592B1 Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity 失效
标题翻译：具有受控Hc和磁通量/单位面积值和受控Cl / Fe强度的磁记录带
公开(公告)号：US06579592B1
公开(公告)日：2003-06-17
申请号：US09324754
申请日：1999-06-03
申请人： Satoshi Matsubaguchi , Masaki Suzuki , Hiroaki Doushita , Hiroaki Takano , Hiroo Inaba , Kiyomi Ejiri
发明人： Satoshi Matsubaguchi , Masaki Suzuki , Hiroaki Doushita , Hiroaki Takano , Hiroo Inaba , Kiyomi Ejiri
IPC分类号： G11B5702
CPC分类号： G11B5/70621 , G11B5/70 , Y10T428/24355 , Y10T428/25 , Y10T428/26 , Y10T428/2982 , Y10T428/31609 , Y10T428/31935
摘要： A magnetic recording tape is described, which comprises a plastic support having provided thereon a magnetic layer comprising a ferromagnetic metal powder dispersed in a binder, wherein the magnetic layer has the product P of the coercivity Hc (Oe) in the in-plane machine direction of the tape and the magnetic flux &phgr;m (G·cm) of from 100 to 160.
摘要翻译：描述了一种磁记录带，其包括在其上设置有包含分散在粘合剂中的强磁性金属粉末的磁性层的塑料支撑体，其中磁性层具有在平面机器方向上的矫顽力Hc（Oe）的乘积P 的磁带和磁通量（G.cm）为100至160。

10. 发明授权

US06376083B1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06376083B1
公开(公告)日：2002-04-23
申请号：US08532976
申请日：1995-09-22
申请人： Yuichiro Murayama , Masaki Satake , Hiroshi Hashimoto , Tsutomu Okita
发明人： Yuichiro Murayama , Masaki Satake , Hiroshi Hashimoto , Tsutomu Okita
IPC分类号： G11B5702
CPC分类号： G11B5/7021 , Y10S428/90 , Y10T428/31609
摘要： The present invention provides a magnetic recording medium having high dispersion property, good running durability and good preservation property, and it comprises at least one magnetic layer having ferromagnetic powder dispersed by a binder placed on a non-magnetic support member, whereby a polyurethane resin or a polyurethane urea resin consisting of 5 mol % or less of a long chain diol having weight average molecular weight of 800 to 5,000, a short chain diol having weight average molecular weight of 50 to 500 and/or a short chain diamine and an organic diisocyanate is contained as the binder, said long chain diol has one polar group selected from —COOM, —SO3M, —OSO3M, —OPO(OM)2, or —PO(OM)2 (where M represents a hydrogen atom, an alkali metal ion, or an ammonium ion) in the molecule, and the polar group is contained in the polyurethane by 1 to 5 mol %.
摘要翻译：本发明提供了具有高分散性，良好的运行耐久性和良好保存性的磁记录介质，并且它包括至少一个磁性层，该磁性层具有通过放置在非磁性支撑构件上的粘合剂分散的铁磁性粉末，由此聚氨酯树脂或由5重量％以下的重均分子量为800〜5000的长链二醇，重均分子量为50〜500的短链二醇和/或短链二胺和有机二异氰酸酯组成的聚氨酯脲树脂所述长链二醇具有一个选自-COOM，-SO3M，-OSO3M，-OPO（OM）2或-PO（OM）2的极性基团（其中M表示氢原子，碱金属离子或铵离子），聚氨酯中的极性基团含有1〜5摩尔％。

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