公开(公告)号：US4664964A

公开(公告)日：1987-05-12

申请号：US726266

申请日：1985-04-23

申请人： Tsutomu Okita ,  Hiroshi Hashimoto

发明人： Tsutomu Okita ,  Hiroshi Hashimoto

IPC分类号： G11B5/702 ,  G11B5/738

CPC分类号： G11B5/738 ,  G11B5/7026 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/24413 ,  Y10T428/24975 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium is described, comprising a non-magnetic support having coated thereon an intermediate layer and a magnetic layer having ferromagnetic particles dispersed in a binder, wherein the surface roughness of the coated surface of the support is 0.01 .mu.m or more, the intermediate layer is formed by using a compound that is polymerizable by radiation exposure being exposed to radiation, and the magnetic layer is formed by using a compound as a binder that is polymerizable by electron beam exposure being exposed to an electron beam.

摘要翻译： 描述了一种磁记录介质，包括其上涂覆有中间层的非磁性载体和分散在粘合剂中的铁磁颗粒的磁性层，其中载体的涂覆表面的表面粗糙度为0.01μm或更大， 通过使用通过暴露于辐射的可聚合的化合物形成中间层，并且通过使用通过电子束曝光可暴露于电子束可聚合的化合物作为粘合剂形成磁性层。

公开(公告)号：US5049448A

公开(公告)日：1991-09-17

申请号：US383514

申请日：1989-07-24

申请人： Takao Ohya ,  Yasuo Nishikawa ,  Jun Nakagawa ,  Fusao Yamanaka ,  Toshio Kawamata ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Mikihiko Kato

发明人： Takao Ohya ,  Yasuo Nishikawa ,  Jun Nakagawa ,  Fusao Yamanaka ,  Toshio Kawamata ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Mikihiko Kato

IPC分类号： C09D5/23 ,  G11B5/71 ,  G11B5/725

CPC分类号： G11B5/725 ,  G11B5/71 ,  Y10S428/90 ,  Y10T428/31 ,  Y10T428/31605 ,  Y10T428/31609

摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer, wherein at least one of ester compounds represented by formula (I) is present in or on the magnetic layer, ##STR1## wherein R.sub.1 represents a straight chain, saturated alkyl group having 6 to 12 carbon atoms, R.sub.2 represents a straight chain, saturated alkyl group having 4 to 10 carbon atoms, and R represents a branched or straight chain alkyl group having 4 to 22 carbon atoms.

摘要翻译： 公开了一种磁记录介质，其包括其上具有磁性层的非磁性载体，其中至少一种由式（I）表示的酯化合物存在于磁性层中或其上，其中R1表示直链 具有6〜12个碳原子的链状饱和烷基，R2表示直链，碳原子数4〜10的饱和烷基，R表示碳原子数为4〜22的支链或直链烷基。

公开(公告)号：US4690870A

公开(公告)日：1987-09-01

申请号：US654290

申请日：1984-09-25

申请人： Tsutomu Okita ,  Nobuo Tsuji ,  Hiroshi Hashimoto ,  Yoshito Mukaida

发明人： Tsutomu Okita ,  Nobuo Tsuji ,  Hiroshi Hashimoto ,  Yoshito Mukaida

IPC分类号： C09D5/23 ,  C09D101/18 ,  C09D127/04 ,  C09D127/06 ,  C09D175/04 ,  C09D175/14 ,  G11B5/702

CPC分类号： G11B5/7026 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935 ,  Y10T428/31971

摘要： A magnetic recording medium comprising a non-magnetic support having thereon an electron-beam radiation-cured magnetic recording layer, said magnetic layer comprising a ferromagnetic oxide and a binder comprising(1) a resin selected from the group consisting of a vinyl resin containing a carboxylic group in an amount of about 5.times.10.sup.-5 to 2.times.10.sup.-3 equivalent per gram and a nitrocellulose resin;(2) an urethane resin having at least one terminal acrylate group in the main chain or in a side chain of the molecule; and(3) a compound having at least one acryloyl group which is obtained by modifying the isocyanate group of a polyisocyanate having at least two isocyanate groups per molecule.

摘要翻译： 一种磁记录介质，包括其上具有电子束辐射固化磁记录层的非磁性载体，所述磁性层包含铁磁性氧化物和粘合剂，所述粘合剂包括（1）选自乙烯基树脂中的树脂， 羧基的量为约5×10-5至2×10-3当量/克和硝酸纤维素树脂; （2）在分子的主链或侧链中具有至少一个末端丙烯酸酯基团的聚氨酯树脂; 和（3）具有至少一个丙烯酰基的化合物，其通过每分子具有至少两个异氰酸酯基团的多异氰酸酯的异氰酸酯基进行改性而获得。

公开(公告)号：US4632878A

公开(公告)日：1986-12-30

申请号：US768007

申请日：1985-08-21

申请人： Tsutomu Okita ,  Hiroshi Hashimoto ,  Akiyoshi Hashimoto ,  Teruo Nakagawa ,  Hiroyuki Kato

发明人： Tsutomu Okita ,  Hiroshi Hashimoto ,  Akiyoshi Hashimoto ,  Teruo Nakagawa ,  Hiroyuki Kato

IPC分类号： C08G18/67 ,  C09D5/23 ,  C09D175/04 ,  C09D175/06 ,  G11B5/702 ,  G11B5/70

CPC分类号： G11B5/7021 ,  C08G18/671 ,  C08G18/673 ,  C08G18/678 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

摘要： The present invention relates to a magnetic recording medium prepared by the process comprising (1) coating a magnetic coating composition mainly containing ferromagnetic particles and a binder on a support and (2) irradiating the resulting support with electron beams, wherein the binder contains a compound represented by the following formula, ##STR1## wherein A represents a radical of a hydroxy compound containing at least one isocyanurate ring and at least one (meth)acryloyl group; DI represents a radical of an organic diisocyanate compound; B represents a radical of a polyol having at least two hydroxy groups; C represents a radical of a polybasic acid having at least two carboxy groups; m is a number of 1 to 7; and N is a positive number of 7 or less.

摘要翻译： 本发明涉及一种通过以下方法制备的磁记录介质：（1）在载体上涂覆主要包含铁磁颗粒和粘合剂的磁性涂料组合物，和（2）用电子束照射所得载体，其中粘合剂含有化合物 由下式表示：A-DI - [（BC）m-B-DI] N-A其中A表示含有至少一个异氰脲酸酯环和至少一个（甲基）丙烯酰基的羟基化合物的基团 ; DI表示有机二异氰酸酯化合物的基团; B表示具有至少两个羟基的多元醇基团; C表示具有至少两个羧基的多元酸的基团; m是1到7的数; N为7以下的正数。

公开(公告)号：US4619855A

公开(公告)日：1986-10-28

申请号：US542931

申请日：1983-10-18

申请人： Tsutomu Okita ,  Nobutaka Yamaguchi ,  Hiroshi Hashimoto

发明人： Tsutomu Okita ,  Nobutaka Yamaguchi ,  Hiroshi Hashimoto

IPC分类号： C09D5/23 ,  C09D101/18 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/73 ,  G11B5/84 ,  G11B5/70

CPC分类号： G11B5/7026 ,  G11B5/7022 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/24413 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium is disclosed. The medium is comprised of a support base having an average center line roughness (Ra) of 0.035 .mu.m or less which has coated thereon a magnetic layer. The magnetic layer is comprised of ferromagnetic fine particles dispersed in a binder comprising (1) a polymer selected from the group consisting of nitrocellulose resins, vinyl chloride-vinyl acetate resins and vinyl chloride-vinyl propionate type resins; (2) a urethane resin; and (3) a compound having 2 or more acrylate groups or methacrylate groups in the molecule thereof. The magnetic layer is cured by radiation with electron beams and has excellent electromagnetic properties as well as high durability. The magnetic medium provides less abrasiveness and the magnetic coating composition is stable and homogeneous during storage.

摘要翻译： 公开了一种磁记录介质。 该介质由平均中心线粗糙度（Ra）为0.035μm或更小的支撑基底组成，其上涂覆有磁性层。 磁性层由分散在粘合剂中的铁磁细颗粒组成，包括（1）选自硝基纤维素树脂，氯乙烯 - 乙酸乙烯酯树脂和氯乙烯 - 丙酸乙烯酯类树脂的聚合物; （2）聚氨酯树脂; 和（3）在其分子中具有2个以上丙烯酸酯基或甲基丙烯酸酯基的化合物。 磁性层通过电子束辐射固化，具有优异的电磁特性以及高耐久性。 磁性介质提供较少的磨损性，并且磁性涂料组合物在储存期间是稳定和均匀的。

公开(公告)号：US4548833A

公开(公告)日：1985-10-22

申请号：US461702

申请日：1983-01-28

申请人： Hiroshi Hashimoto ,  Tsutomu Okita

发明人： Hiroshi Hashimoto ,  Tsutomu Okita

IPC分类号： G11B5/70 ,  C09D5/23 ,  C09D175/00 ,  C09D175/14 ,  G11B5/73 ,  G11B5/842 ,  G11B5/845 ,  B05D3/06

CPC分类号： G11B5/845 ,  Y10S428/90

摘要： A method for preparing a magnetic recording medium is disclosed. The method includes providing a support base and a particular coating composition for the base. The composition is comprised of a ferromagnetic powder, a binder containing a compound capable of being polymerized with electron beam irradiation, and a solvent. The composition has apparent viscosity of about 1 to 150 centipoise at a shearing speed of 4000 sec.sup.-1. After coating the composition on the support base, the coated layer is subjected to magnetic orientation. During orientation or shortly thereafter the coated layer is subjected to electrom beam irradiation and then dried in order to evaporate the solvent. The magnetic recording medium prepared has excellent dispersibility of the ferromagnetic fine powder within the binder, which further provides a smooth surface and excellent electrical properties as well as anti-abrasion properties.

摘要翻译： 公开了一种制备磁记录介质的方法。 该方法包括提供支撑基底和用于基底的特定涂层组合物。 该组合物由铁磁粉末，含有能够用电子束照射聚合的化合物的粘合剂和溶剂组成。 该组合物在4000sec -1的剪切速度下具有约1至150厘泊的表观粘度。 将组合物涂布在支撑基底上之后，涂覆层经受磁性取向。 在取向期间或不久之后，对涂层进行电磁辐射照射，然后干燥以蒸发溶剂。 制备的磁记录介质具有极好的铁磁细粉在粘合剂中的分散性，这进一步提供了光滑的表面和优异的电性能以及抗磨损性能。

公开(公告)号：US5079085A

公开(公告)日：1992-01-07

申请号：US417334

申请日：1989-10-05

申请人： Hiroshi Hashimoto ,  Tsutomu Okita

发明人： Hiroshi Hashimoto ,  Tsutomu Okita

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  G11B5/702

CPC分类号： G11B5/7021 ,  Y10S428/90 ,  Y10T428/254 ,  Y10T428/2991 ,  Y10T428/2998

摘要： A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising ferromagnetic fine powder dispersed in a binder, wherein said magnetic layer contains crosslinked resin fine particles to which a polymer containing an --OH group has been bonded, and an isocyanate compound, said polymer containing an --OH group having an affinity toward said binder and said --OH group reacting with said isocyanate compound to form a chemical bond with said binder.

摘要翻译： 一种包含非磁性载体的磁记录介质，其上设置有分散在粘合剂中的铁磁细粉末的磁性层，其中所述磁性层含有已经结合有-OH基团的聚合物的交联树脂细颗粒和异氰酸酯化合物， 所述聚合物含有对所述粘合剂具有亲和性的-OH基团，所述-OH基团与所述异氰酸酯化合物反应以与所述粘合剂形成化学键。

公开(公告)号：US4976989A

公开(公告)日：1990-12-11

申请号：US532158

申请日：1990-06-04

申请人： Masashi Aonuma ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Kingo Kobayashi

发明人： Masashi Aonuma ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Kingo Kobayashi

IPC分类号： G11B5/702 ,  G11B5/842

CPC分类号： G11B5/842 ,  G11B5/7026

摘要： A method for preparing a magnetic recording medium comprises the steps of coating, on a non-magnetic support, a magnetic layer mainly containing ferromagnetic particles and a binder polymerizable by radiation exposure, conducting a calendering treatment, and thereafter conducting a radiation exposure treatment without winding up the magnetic layer.

摘要翻译： 一种制备磁记录介质的方法包括以下步骤：在非磁性载体上涂覆主要包含铁磁颗粒的磁性层和通过辐射曝光可聚合的粘合剂，进行压延处理，然后进行辐射曝光处理而不缠绕 磁层。

公开(公告)号：US4812351A

公开(公告)日：1989-03-14

申请号：US191804

申请日：1988-05-03

申请人： Tsutomu Okita ,  Masashi Aonuma ,  Hiroshi Hashimoto

发明人： Tsutomu Okita ,  Masashi Aonuma ,  Hiroshi Hashimoto

IPC分类号： G11B5/735 ,  G11B5/70

CPC分类号： G11B5/735 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/265

摘要： A magnetic recording medium is described, comprising a non-magnetic support having a surface roughness of 0.02 .mu.m or less, a magnetic layer on the surface of the support and a backing layer on a surface of the support opposite to the surface on which the magnetic layer is formed, wherein the backing layer is formed by exposing to radiation a layer comprising (A) non-magnetic particles and (B) a radiation polymerizable compound.

摘要翻译： 描述了一种磁记录介质，其包括具有0.02μm或更小的表面粗糙度的非磁性支撑体，支撑体表面上的磁性层和与表面相反的表面的表面上的背衬层， 形成磁性层，其中通过将包含（A）非磁性颗粒和（B）可辐射聚合化合物的层暴露于辐射而形成背衬层。

公开(公告)号：US4671998A

公开(公告)日：1987-06-09

申请号：US831686

申请日：1986-02-21

申请人： Tsutomu Okita ,  Masashi Aonuma ,  Hiroshi Hashimoto

发明人： Tsutomu Okita ,  Masashi Aonuma ,  Hiroshi Hashimoto

IPC分类号： C09D4/00 ,  C09D5/23 ,  C09D175/14 ,  C09D175/16 ,  G11B5/702

CPC分类号： G11B5/7026 ,  G11B5/7022 ,  G11B5/7023 ,  Y10S428/90 ,  Y10T428/31504 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium having an improved durability is disclosed, which comprises a support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, that is exposed to radiation, wherein the binder comprises a compound having one or more triazine rings and at least two vinyl groups per molecule.

摘要翻译： 公开了具有改进的耐久性的磁记录介质，其包括在其上设置有暴露于辐射的含有铁磁颗粒和粘合剂的磁性层的载体，其中粘合剂包含具有一个或多个三嗪环和至少两个 乙烯基。