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公开(公告)号：US20080187784A1
公开(公告)日：2008-08-07
申请号：US12026119
申请日：2008-02-05
IPC分类号： G11B5/702
CPC分类号： G11B5/73 , G11B5/7021
摘要： The invention provides a magnetic recording medium having a structure in which a magnetic layer containing magnetic particles and a binder is formed on a nonmagnetic layer containing nonmagnetic particles and a binder, wherein the binder contained in the nonmagnetic layer contains a polyurethane resin having 50 to 100 eq/t of metal phosphate groups and 800 to 1600 eq/t of unsaturated hydrocarbon groups in its molecule and obtained by reacting a polyester polyol (A) containing an aliphatic dicarboxylic acid as an acid component, an aromatic polyisocyanate compound (B) and a compound (C) having unsaturated hydrocarbon groups and a functional group which reacts with an isocyanate group and a molecular weight of 500 or less, and the nonmagnetic layer has good dispersibility even by using fine nonmagnetic particles and can ensure satisfactory coating film strength even at a radiation dose of 3 Mrad or less.
摘要翻译： 本发明提供了一种磁记录介质，其结构是在包含非磁性颗粒和粘合剂的非磁性层上形成含有磁性颗粒和粘合剂的磁性层，其中包含在非磁性层中的粘合剂含有具有50至100个 通过使含有作为酸成分的脂肪族二羧酸的聚酯多元醇（A），芳香族多异氰酸酯化合物（B）和芳香族多异氰酸酯化合物（B）和（A）成分，通过使分子内的金属磷酸酯基的量/ eq / t和不饱和烃基800〜1600eq / 具有不饱和烃基的化合物（C）和与异氰酸酯基反应的分子量为500以下的官能团，即使使用微细的非磁性粒子，非磁性层也具有良好的分散性，并且即使在 辐射剂量3 Mrad以下。
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公开(公告)号：US5783296A
公开(公告)日：1998-07-21
申请号：US835022
申请日：1997-03-27
申请人： Kazunori Tamazaki , Shigeharu Watase , Osamu Inoue
发明人： Kazunori Tamazaki , Shigeharu Watase , Osamu Inoue
CPC分类号： G11B5/73 , Y10S428/90 , Y10T428/24975 , Y10T428/256 , Y10T428/31725
摘要： This invention concerns a magnetic recording medium which comprises a nonmagnetic support, a magnetic layer provided on one surface of the nonmagnetic support and a backcoat layer provided on the other surface of the nonmagnetic support, wherein the nonmagnetic support is provided with such physical properties as Young's moduluses in the longitudinal direction and the lateral direction thereof in the range of 1300-1600 kg/cm.sup.2, respectively, and a breaking elongation in the range of 3-10% and said magnetic recording medium is provided on the magnetic layer side thereof with a convex cupping the magnitude of which is in the range of 0.02-0.20 mm at a width of 3.8 mm. The magnetic recording medium, therefore, realizes perfect head touch even when the thickness of the nonmagnetic support and the thickness of the whole medium are small. Even when the magnetic recording medium is exposed to the mechanical influences and physical influences of aging, it suffers extremely small change in the form (such as, for example, the cupping value) and therefore conserves the head touch and other factors in highly satisfactory state. It suffers occurrence of dropout or head stain only sparingly.
摘要翻译： 本发明涉及一种磁记录介质，其包括非磁性载体，设置在非磁性载体的一个表面上的磁性层和设置在非磁性载体的另一个表面上的背涂层，其中非磁性载体具有诸如杨氏 在纵向方向和横向方向分别在1300-1600kg / cm2范围内，在3-10％的范围内的断裂伸长率和所述磁记录介质在其磁性层侧上设置有 凸起拔罐，其幅度在宽度为3.8mm的0.02-0.20mm的范围内。 因此，即使当非磁性载体的厚度和整个介质的厚度小时，磁记录介质也实现了完美的头部触摸。 即使当磁记录介质暴露于老化的机械影响和物理影响时，其形状（例如，拔罐值）也发生非常小的变化，因此在令人满意的状态下节省了头部接触等因素 。 只有少量出现辍学或头部染色。
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公开(公告)号：US4772522A
公开(公告)日：1988-09-20
申请号：US6432
申请日：1987-01-23
CPC分类号： G11B5/708 , G11B5/70678 , G11B5/71 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/30
摘要： A magnetic recording medium comprising a substrate, an optional undercoat layer, and a magnetic layer formed thereon and containing a hexagonal plate magnetic powder, an electroconductive material, and a binder is improved in runnability and recording density by the presence of a fatty acid ester at least on the recording side surface of the magnetic layer, and by providing an electric resistance of up to 5.times.10.sup.9 .OMEGA./cm.sup.2 on the side of the magnetic layer.
摘要翻译： 包含基材，任选的底涂层和形成在其上并含有六方板磁性粉末，导电材料和粘合剂的磁性层的磁记录介质通过存在脂肪酸酯而改善了运行性和记录密度 至少在磁性层的记录侧表面上，并且通过在磁性层的一侧提供高达5×10 9欧姆/平方厘米的电阻。
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公开(公告)号：US4746558A
公开(公告)日：1988-05-24
申请号：US841224
申请日：1986-03-19
CPC分类号： G11B5/7305 , Y10S428/90 , Y10T428/24355 , Y10T428/25
摘要： A magnetic recording medium comprising a non-magnetic substrate and a coating type magnetic recording layer formed on the substrate, wherein barium ferrite magnetic powder is perpendicularly oriented, characterized in that an undercoating layer comprising a radiation curable binder and carbon black, is provided beneath the magnetic recording layer.
摘要翻译： 一种磁性记录介质，包括形成在所述基板上的非磁性基板和涂覆型磁记录层，其中钡铁氧体磁性粉末是垂直取向的，其特征在于，在其下面设置包括可辐射固化粘合剂和炭黑的底涂层 磁记录层。
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公开(公告)号：US4560617A
公开(公告)日：1985-12-24
申请号：US588903
申请日：1984-03-12
IPC分类号： C09D5/00 , C09D5/23 , C09D127/04 , G11B5/702 , G11B5/70
CPC分类号： G11B5/7028 , G11B5/7023 , G11B5/7026 , Y10S428/90 , Y10S522/911 , Y10T428/256 , Y10T428/257 , Y10T428/31551 , Y10T428/31565 , Y10T428/31931 , Y10T428/31935
摘要： A magnetic recording medium comprising fine ferromagnetic particles as the main component and a binder composed of a mixture of a radiation sensitive soft resin, a radiation sensitive modified resin and a partially saponified vinyl chloride-vinyl acetate copolymer containing at least 0.5% by weight of maleic acid, said binder being cross-linked and polymerized by radiation.
摘要翻译： 一种磁性记录介质，其特征在于包含细铁磁颗粒作为主要组分，和由辐射敏感的软树脂，辐射敏感的改性树脂和部分皂化的氯乙烯 - 乙酸乙烯酯共聚物的混合物组成的粘合剂，其含有至少0.5重量％的马来酸 酸，所述粘合剂被交联并通过辐射聚合。
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公开(公告)号：US5089344A
公开(公告)日：1992-02-18
申请号：US386980
申请日：1989-07-31
IPC分类号： C08G18/66 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/842
CPC分类号： C08G18/664 , G11B5/7021 , G11B5/842 , Y10S428/90 , Y10T428/31609
摘要： A magnetic recording medium whose magnetic layer formed on a base comprises a magnetic powder and a binder which contains a tertiary amine and uses 1,4-cyclohexanedimethanol as a chain extender. The magnetic powder is preferably of CrO.sub.2. The medium is made by mixing and dispersing the magnetic powder in a binder which consists of a reaction product of (A) a polyester which is a reaction product of a diol selected from among ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentadiol, and 1,6-hexanediol, and adipic acid, (B) a chain extender consisting of 1,4-cyclohexanedimethanol, (C) an aliphatic or aromatic diisocyanate in an amount substantially equal to the combined molar amount of the polyester and the chain extender, and (D) a tertiary amine, and applying the resulting magnetic coating material to a base.
摘要翻译： 形成在基材上的磁性层的磁记录介质包括磁性粉末和含有叔胺的粘合剂，并使用1,4-环己烷二甲醇作为扩链剂。 磁性粉末优选为CrO 2。 该介质通过将磁性粉末混合并分散在粘合剂中而制成，所述粘合剂由（A）作为选自乙二醇，丙二醇，1,3-丁二醇，1,3-丁二醇的二醇的反应产物的聚酯的反应产物组成 ，1,4-丁二醇，1,5-戊二醇和1,6-己二醇，和己二酸，（B）由1,4-环己烷二甲醇组成的扩链剂，（C）基本上等于 聚酯和扩链剂的组合摩尔量，和（D）叔胺，并将所得的磁性涂层材料施加到基底上。
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公开(公告)号：US4794042A
公开(公告)日：1988-12-27
申请号：US917224
申请日：1986-10-09
申请人： Yuichi Kubota , Keiji Koga , Kazunori Tamazaki , Tsutomu Aoyama , Akio Watanabe
发明人： Yuichi Kubota , Keiji Koga , Kazunori Tamazaki , Tsutomu Aoyama , Akio Watanabe
CPC分类号： G11B5/70673 , G11B5/70626 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/2991 , Y10T428/2998 , Y10T428/30
摘要： A magnetic recording medium wherein a magnetic layer containing a particulate magnetic material and a binder is formed on a substrate exhibits improved performance as magnetic recording tape, disk, and sheet when the particulate magnetic material comprises particles having iron carbide at least on the surface thereof and optional oxide particles, and the particulate magnetic material contains 5 to 90% by weight of iron carbide in the form of Fe.sub.n C.
摘要翻译： 其中在基片上形成含有颗粒状磁性材料和粘结剂的磁性层的磁记录介质当磁性材料至少包含至少表面具有碳化铁的颗粒时，表现出磁性记录带，盘和片的性能的改善， 任选的氧化物颗粒，并且颗粒状磁性材料含有5至90重量％的FenC形式的碳化铁。
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公开(公告)号：US4741977A
公开(公告)日：1988-05-03
申请号：US896458
申请日：1986-08-14
申请人： Keiji Koga , Keiko Tsuchiya , Kazunori Tamazaki , Tsutomu Aoyama , Yuichi Kubota
发明人： Keiji Koga , Keiko Tsuchiya , Kazunori Tamazaki , Tsutomu Aoyama , Yuichi Kubota
CPC分类号： G11B5/71 , G11B5/7026 , Y10S428/90
摘要： A magnetic sheet comprising a disk-shaped substrate and a magnetic layer is loaded in a magnetic sheet operating device, typically electronic camera comprising a magnetic head for performing recording and reproducing operations on the sheet while rotating the sheet. The magnetic layer is formed from a composition comprising a magnetic powder and a binder having a specified complex elastic modulus.
摘要翻译： 包括盘状基板和磁性层的磁性片被装载在磁性片操作装置中，通常是包括用于在片材旋转的同时在片材上执行记录和再现操作的磁头的电子照相机。 磁性层由包含磁性粉末和具有规定的复弹性模量的粘合剂的组合物形成。
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公开(公告)号：US20080187783A1
公开(公告)日：2008-08-07
申请号：US12026128
申请日：2008-02-05
IPC分类号： G11B5/62
CPC分类号： G11B5/73 , G11B5/7021
摘要： The invention provides a magnetic recording medium having a structure in which a magnetic layer containing magnetic particles and a binder is formed on a nonmagnetic layer containing nonmagnetic particles and a binder, wherein the binder contained in the nonmagnetic layer contains a polyurethane resin which has a metal sulfonate group and unsaturated hydrocarbon groups in its molecule and is obtained by reacting a polyester polyol (A) containing an aliphatic dicarboxylic acid as an acid component, an aromatic polyisocyanate compound (B), a compound (C) having unsaturated hydrocarbon groups and a functional group which reacts with an isocyanate group and a molecular weight of 500 or less with a branched compound (D) represented by the following formula (1), and the nonmagnetic layer has good dispersibility even by using fine nonmagnetic particles and can ensure satisfactory coating film strength even at a radiation dose of 3 Mrad or less.
摘要翻译： 本发明提供一种磁记录介质，其结构是在包含非磁性颗粒和粘合剂的非磁性层上形成含有磁性颗粒和粘合剂的磁性层，其中包含在非磁性层中的粘合剂含有具有金属的聚氨酯树脂 磺酸酯基和不饱和烃基，通过使含有脂肪族二羧酸的酸性成分的聚酯多元醇（A），芳香族多异氰酸酯化合物（B），具有不饱和烃基的化合物（C）和官能团 与异氰酸酯基反应，分子量为500以下的基团，由下式（1）表示的支链化合物（D），即使使用微细的非磁性粒子，非磁性层也具有良好的分散性，可以确保满意的涂膜 即使在3Mrad或更低的辐射剂量下也是如此。
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