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公开(公告)号：US07128989B2
公开(公告)日：2006-10-31
申请号：US10219669
申请日：2002-08-16
CPC分类号： G11B5/714 , G11B5/7021 , G11B5/7023 , G11B5/70678
摘要： Provided is a magnetic recording medium having excellent dispersibility, smoothness and electromagnetic characteristics. The magnetic recording medium comprises at least one magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. Said ferromagnetic powder is a ferromagnetic metal powder having an average major axis length of 10 to 80 nm and a crystallite size of 8 to 18 nm, or a ferromagnetic hexagonal ferrite powder having an average plate diameter of 5 to 40 nm, and said binder comprises 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 (where M denotes a hydrogen atom, alkali metal or ammonium salt), and/or 0.5 to 5 meq/g of at least one polar group selected from —CONR1R2, —NR1R2 and —NR1R2R3+ (where R1, R2 and R3 independently denote hydrogen atoms or alkyl groups).
摘要翻译： 提供了具有优异的分散性，平滑性和电磁特性的磁记录介质。 磁记录介质包括至少一个包含非磁性载体上的铁磁性粉末和粘合剂的磁性层。 所述铁磁粉末是平均长轴长度为10〜80nm，微晶尺寸为8〜18nm的铁磁性金属粉末，平均板直径为5〜40nm的铁磁性六角铁氧体粉末，所述粘合剂包含 0.2〜0.7meq / g的选自-SO 3 M，-OSO 3 M，-PO（OM）2
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公开(公告)号：US6010773A
公开(公告)日：2000-01-04
申请号：US978416
申请日：1997-11-25
CPC分类号： G11B5/7021 , G11B5/7022 , G11B5/716 , G11B5/738 , Y10S428/90 , Y10T428/24975 , Y10T428/265 , Y10T428/31609
摘要： The present invention provides a magnetic recording medium having good electromagnetic transfer characteristics and high running durability, and it comprises a lower layer and a magnetic layer, said lower layer having at least one of magnetic powder or non-magnetic inorganic powder and a binder (A) dispersed therein and being placed on a non-magnetic support member, at least one layer of said magnetic layers having ferromagnetic powder and a binder (B) dispersed therein and being deposited on said lower layer, whereby said magnetic recording medium comprises polyurethane resins (1) and (2), said polyurethane resin (1) is contained as said binder (B) and comprises a short-chain diol having a cyclic structure and weight average molecular weight of 200 to 500 in an amount of 15 to 50 weight %, a polyol having an ether group of 1 to 6 mmol/g and weight average molecular weight of 500 to 5000 in an amount of 10 to 50 weight % in polyurethane, and an organic diisocyanate, and said polyurethane resin (2) is contained as said binder (A) and comprises a short-chain diol having cyclic structure and weight average molecular weight of 200 to 500 in an amount of 0 to 15 weight %, a polyol having an ether group of 6 to 14 mmol/g and weight average molecular weight of 500 to 5000 in an amount of 50 to 90 weight %, and an organic diisocyanate.
摘要翻译： 本发明提供一种具有良好的电磁传递特性和高运行耐久性的磁记录介质，它包括下层和磁性层，所述下层具有至少一种磁粉或非磁性无机粉末和粘合剂（A ）分散在其中并且被放置在非磁性支撑构件上，至少一层所述磁性层具有铁磁粉末和粘合剂（B）分散在其中并沉积在所述下层上，由此所述磁记录介质包括聚氨酯树脂（ 1）和（2）中，作为所述粘合剂（B）含有所述聚氨酯树脂（1），其含有15〜50重量％的环状结构，重均分子量为200〜500的短链二醇 ，聚氨酯中的醚基为1〜6mmol / g，重均分子量为500〜5000的多元醇，有机二异氰酸酯，所述聚氨酯 包含作为所述粘合剂（A）的新型树脂（2），其含有0〜15重量％的环状结构和重均分子量为200〜500的短链二醇，醚基为6的多元醇 至14mmol / g，重量平均分子量为500至5000，数量为50至90重量％，和有机二异氰酸酯。
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公开(公告)号：US06221468B1
公开(公告)日：2001-04-24
申请号：US09220337
申请日：1998-12-24
IPC分类号： G11B05702
CPC分类号： G11B5/70621 , G11B5/7021 , G11B5/7022 , Y10S428/90 , Y10T428/24967 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/31609
摘要： In a magnetic recording medium comprising a nonmagnetic substrate and at least one magnetic layer provided on the nonmagnetic substrate, in which layer a ferromagnetic fine powder and a binder are dispersed together, the magnetic layer comprises as a substantial binder a polyurethane obtained from a polyester polyol, a chain extender and an organic diisocyanate. The ferromagnetic fine powder contains cobalt-containing iron as a main component, and the polyurethane comprises a polyester polyol containing an aliphatic dibasic acid as a dibasic acid, and a diol component, at least 70 mol % of which contains an alkyl branched side chain having at least 2 carbon atoms.
摘要翻译： 在包含非磁性基底和至少一个设置在非磁性基底上的磁性层的磁记录介质中，铁磁性细粉末和粘合剂层分散在一起，磁性层包含作为基本粘合剂的由聚酯多元醇获得的聚氨酯 ，增链剂和有机二异氰酸酯。 所述铁磁性细粉末含有含钴铁作为主要成分，所述聚氨酯包含含有作为二元酸的脂肪族二元酸的聚酯多元醇和至少70摩尔％的含有烷基支链侧链的二元醇成分， 至少2个碳原子。
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公开(公告)号：US06224967B1
公开(公告)日：2001-05-01
申请号：US09082730
申请日：1998-05-21
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。
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公开(公告)号：US06565964B1
公开(公告)日：2003-05-20
申请号：US09094496
申请日：1998-06-10
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。
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公开(公告)号：US06500551B1
公开(公告)日：2002-12-31
申请号：US09509024
申请日：2000-03-21
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。
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公开(公告)号：US06444306B1
公开(公告)日：2002-09-03
申请号：US09705742
申请日：2000-11-06
IPC分类号： B32B516
CPC分类号： G11B5/7021 , Y10T428/25 , Y10T428/31609
摘要： A magnetic recording medium, comprising at least one magnetic layer, said magnetic layer containing ferromagnetic powder and a binder and placed on a nonmagnetic support member, whereby said binder contains a polyurethane resin, using a diol compound having a cyclic structure and a long-chain alkyl chain, and a polyol with weight average molecular weight (Mw) of 400-5000 and having at least one type of polar group selected from the following groups: —SO3M, —SO4M, —PO3M2, —PO4M2, —NHSO3M, >NSO3M, and —COOM where M represents hydrogen, at least one type of alkali metal of potassium, sodium and lithium, and an organic amine containing at least one type of alkylamine and alkanol.
摘要翻译： 一种磁记录介质，包括至少一个磁性层，所述磁性层含有铁磁性粉末和粘合剂并且放置在非磁性支撑构件上，由此所述粘合剂含有聚氨酯树脂，使用具有环状结构和长链的二醇化合物 烷基链和重均分子量（Mw）为400-5000的多元醇，并且具有至少一种选自以下基团的极性基团：-SO 3 M，-SO 4 M，-PO 3 M 2，-PO 4 M 2，-NHSO 3 M，> NSO 3 M 和-COOM，其中M表示氢，至少一种钾，钠和锂的碱金属，以及含有至少一种烷基胺和链烷醇的有机胺。
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8.发明授权Magnetic recording medium containing specific binder in the magnetic layer and the lower non-magnetic layer 失效在磁性层和下部非磁性层中含有特定粘结剂的磁记录介质公开(公告)号：US06686073B2
公开(公告)日：2004-02-03
申请号：US09988453
申请日：2001-11-16
IPC分类号： B32B516
CPC分类号： G11B5/738 , G11B5/7022 , G11B5/70621 , G11B5/70678
摘要： A magnetic recording medium containing a support having provided thereon a lower layer containing a nonmagnetic powder and a binder and further provided thereon at least one magnetic layer containing a ferromagnetic powder and a binder. The lower layer can contain as a binder at least a monomer unit containing from 5 to 45% by weight of a (meth)acrylate unit containing a benzene ring and from 1 to 45% by weight of a radical polymerizable monomer unit containing a nitrogen atom, with these units making a total amount of 100% by weight. It can also contain an acrylic resin having a hydrophilic polar group. The magnetic recording medium may also contain a support having provided thereon at least one magnetic layer containing a ferromagnetic powder and a binder each in the dispersed state. The magnetic layer can contain at least a monomer unit comprising from 15 to 75% by weight of an alkyl (meth)acrylate as a binder and from 1 to 45% by weight of a radical polymerizable monomer unit containing nitrogen, with these units making a total amount of 100% by weight. It can also contain an acrylic resin having a hydrophilic polar group used in combination with a resin (A) defined herein; a resin (B) defined herein; or a resin (C) defined herein.
摘要翻译： 一种磁记录介质，其含有在其上设置有含有非磁性粉末和粘合剂的下层的载体，并且还设置有至少一个含有铁磁性粉末和粘合剂的磁性层。 下层可以含有作为粘合剂的至少一种单体单元，其含有5〜45重量％的含有苯环的（甲基）丙烯酸酯单元和1〜45重量％的含有氮原子的自由基聚合性单体单元 ，这些单位的总量为100重量％。 它还可以含有具有亲水极性基团的丙烯酸树脂。 磁记录介质还可以包含其上设置有至少一个含有分散状态的铁磁粉末和粘合剂的磁性层的载体。 磁性层可以含有至少一种包含15至75重量％的作为粘合剂的（甲基）丙烯酸烷基酯和1至45重量％含有氮的可自由基聚合的单体单元的单体单元，这些单元制成 总量为100重量％。 它还可以含有与本文定义的树脂（A）组合使用的具有亲水极性基团的丙烯酸树脂; 本文定义的树脂（B） 或本文定义的树脂（C）。
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公开(公告)号：US5989716A
公开(公告)日：1999-11-23
申请号：US852446
申请日：1997-05-07
CPC分类号： G11B5/7013 , Y10S428/90 , Y10T428/31609 , Y10T428/31935
摘要： The present invention provides a magnetic recording medium, in which a binder does not migrates toward the surface of a magnetic layer and which has high durability. Said magnetic recording layer comprises at least one type or more of organic phosphorus compounds selected from the following formulae (1) to (3) and a binder, which contains an amino group or a quaternary ammonium base: ##STR1## where R represents substituted or non-substituted alkyl group, alkenyl group or aryl group, M represents hydrogen atom or alkali metal or ammonium, and n is 1 or 2.
摘要翻译： 本发明提供一种磁记录介质，其中粘合剂不向磁性层的表面迁移并且具有高耐久性。 所述磁记录层包含至少一种或多种选自下式（1）至（3）的有机磷化合物和含有氨基或季铵碱的粘合剂：其中R表示取代或未取代的 烷基，烯基或芳基，M表示氢原子或碱金属或铵，n为1或2。
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公开(公告)号：US06623849B2
公开(公告)日：2003-09-23
申请号：US09866091
申请日：2001-05-25
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.
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