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。

公开(公告)号：US4621027A

公开(公告)日：1986-11-04

申请号：US666081

申请日：1984-10-29

申请人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida ,  Hiroshi Hashimoto ,  Teruo Nakagawa ,  Akiyoshi Hashimoto ,  Takahisa Ogasawara, deceased

发明人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida ,  Hiroshi Hashimoto ,  Teruo Nakagawa ,  Akiyoshi Hashimoto ,  Takahisa Ogasawara, deceased

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

CPC分类号： G11B5/7023 ,  G11B5/7021 ,  G11B5/7022 ,  G11B5/7026 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium is described, comprising a support and a magnetic layer disposed thereon, said magnetic layer containing as its binder component a combination of at least one member of each of the following groups of compounds (1) to (3) that has been exposed to electron beams:(1) vinyl chloride type resin, vinyl acetate type resin, vinyl chloride-vinyl acetate type resin, each containing from 5.times.10.sup.-5 to 2.times.10.sup.-3 equivalents of --CO.sub.2 H groups per gram of copolymer, and nitrocellulose resin;(2) urethane resins and urethane-acrylate oligomers; and(3) compounds containing an isocyanurate ring and at least two groups selected from acryloyl and methacryloyl groups.

摘要翻译： 描述了一种磁记录介质，其包括支撑体和设置在其上的磁性层，所述磁性层包含作为其粘合剂组分的化合物（1）至（3）的以下各组中的至少一个的组合， 暴露于电子束：（1）氯乙烯类树脂，乙酸乙烯酯型树脂，氯乙烯 - 乙酸乙烯酯型树脂，每克共聚物含有5×10-5至2×10-3当量的-CO 2 H基，硝基纤维素树脂; （2）聚氨酯树脂和氨基甲酸酯丙烯酸酯低聚物; 和（3）含有异氰脲酸酯环和至少两个选自丙烯酰基和甲基丙烯酰基的基团的化合物。

公开(公告)号：US5702821A

公开(公告)日：1997-12-30

申请号：US555447

申请日：1995-11-09

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： C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

CPC分类号： G11B5/7021 ,  Y10S428/90 ,  Y10T428/31609

摘要： In a binder for a magnetic recording medium for forming a magnetic layer with ferromagnetic powder dispersed therein being arranged on a non-magnetic support member, whereby said binder consists of a polyurethane resin, which is a reaction product of diol and organic diisocyanate as principal materials, said polyurethane resin contains a short-chain diol having cyclic structure by 17 to 40 weight %, and said polyurethane resin contains a long-chain diol comprising 1.0 to 5.0 mmol/g of ether group to total urethane resin by 10 to 50 weight %. According to a binder for a magnetic recording medium and a magnetic recording medium using said binder of the present invention, good dispersion property, high running durability and preservation property can be obtained.

摘要翻译： 在用于形成其中分散有铁磁性粉末的磁性层的磁记录介质的粘合剂中，其布置在非磁性支撑构件上，由此所述粘合剂由作为主要材料的二醇和有机二异氰酸酯的反应产物的聚氨酯树脂 所述聚氨酯树脂含有具有17〜40重量％的环状结构的短链二醇，所述聚氨酯树脂含有长链二醇，其含有1.0〜5.0mmol / g的醚基与总聚氨酯树脂的比例为10〜50重量％ 。 根据本发明的磁记录介质用粘合剂和使用该粘合剂的磁记录介质，可以获得良好的分散性，高运行耐久性和保存性。

公开(公告)号：US5578376A

公开(公告)日：1996-11-26

申请号：US417959

申请日：1995-04-06

申请人： Hiroshi Hashimoto ,  Masatoshi Takahashi ,  Yuuichirou Murayama ,  Tsutomu Okita

发明人： Hiroshi Hashimoto ,  Masatoshi Takahashi ,  Yuuichirou Murayama ,  Tsutomu Okita

IPC分类号： C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/706

CPC分类号： G11B5/7022 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/31609

摘要： A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic powder and a binder, the ferromagnetic powder comprising a ferromagnetic metal powder comprising Fe and having a crystal size of from 120 to 250 .ANG. and a Co content of from 5 to 40 atm %, and the binder comprises a polyurethane comprising a diol component and a polyisocyanate component, the diol component comprising a polyetherpolyol and a polyesterpolyol.

摘要翻译： 一种磁记录介质，包括其上具有包含铁磁粉末和粘合剂的磁性层的非磁性载体，所述铁磁粉末包含Fe的铁磁性金属粉末，其晶体尺寸为120至250埃，Co含量为5 至40atm％，并且所述粘合剂包含包含二醇组分和多异氰酸酯组分的聚氨酯，所述二醇组分包含聚醚多元醇和聚酯多元醇。

公开(公告)号：US5153071A

公开(公告)日：1992-10-06

申请号：US707971

申请日：1991-05-23

申请人： Hideomi Watanabe ,  Tsutomu Okita ,  Hiroshi Hashimoto

发明人： Hideomi Watanabe ,  Tsutomu Okita ,  Hiroshi Hashimoto

IPC分类号： C08L75/08 ,  G11B5/702

CPC分类号： G11B5/7022 ,  C08L75/08 ,  Y10S428/90 ,  Y10T428/3158 ,  Y10T428/31609

摘要： A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic particles disposed in a binder, the binder comprising a vinyl chloride copolymer and a polyurethane resin, wherein the polyurethane resin is a polyether polyurethane resin containing a polyether polyol having a ring structure.

摘要翻译： 一种包含非磁性载体的磁记录介质，其上具有包含设置在粘合剂中的铁磁颗粒的磁性层，所述粘合剂包括氯乙烯共聚物和聚氨酯树脂，其中所述聚氨酯树脂是含有聚醚多元醇的聚醚聚氨酯树脂， 环结构。

公开(公告)号：US5126215A

公开(公告)日：1992-06-30

申请号：US337686

申请日：1989-04-13

申请人： Masashi Aonuma ,  Hiroaki Araki ,  Hiroshi Hashimoto ,  Tsutomu Okita ,  Yasuo Nishikawa

发明人： Masashi Aonuma ,  Hiroaki Araki ,  Hiroshi Hashimoto ,  Tsutomu Okita ,  Yasuo Nishikawa

IPC分类号： G11B5/712

CPC分类号： G11B5/712 ,  Y10S428/90

摘要： A magnetic recording medium comprising a nonmagnetic support having formed thereon a magnetic layer containing ferromagnetic particles dispersed in a binder, wherein the surface of the magnetic layer has pores of (a) at most 50 .ANG. in the average value of pore inlet diameters measured by a nitrogen gas adsorption method and (b) at least 25 .ANG. in the half value width of the frequency distribution curve of the pore inlet diameters.

摘要翻译： 一种磁记录介质，包括在其上形成有分散在粘合剂中的铁磁颗粒的磁性层的非磁性载体，其中所述磁性层的表面具有孔（a）至多为50的孔，孔的平均值由 氮气吸附法和（b）孔入口直径频率分布曲线半值宽度中至少25 ANGSTROM。

公开(公告)号：US4810435A

公开(公告)日：1989-03-07

申请号：US918076

申请日：1986-10-14

申请人： Koh Kamada ,  Hiroshi Hashimoto ,  Tsutomu Okita

发明人： Koh Kamada ,  Hiroshi Hashimoto ,  Tsutomu Okita

IPC分类号： G11B11/10 ,  B05C9/12 ,  B29C35/08 ,  B29C35/10 ,  B29C43/22 ,  B29C43/28 ,  C08J7/04 ,  G11B5/84 ,  G11B11/105

CPC分类号： B29C43/28 ,  B05C9/12 ,  B29C35/10 ,  B29C43/222 ,  B29C47/0019 ,  G11B5/8404 ,  B29C2035/0877 ,  B29C2043/483 ,  B29C43/00 ,  B29C47/0021 ,  B29C47/0035 ,  B29C47/0059 ,  B29C47/025 ,  B29K2105/0002 ,  B29K2995/0072 ,  B29L2017/008

摘要： A method of making a substrate for a magnetic recording medium comprises the steps of applying a radiation-polymerizable compound at least to one surface of a base sheet, closely contacting a surface of a transfer member with a surface of a coating layer thus formed of the radiation-polymerizable compound, exposing the coating layer to a radiation from the side of the base sheet or the transfer member, whichever is permeable to the radiation, and separating the transfer member form the surface of the coating layer. The surface of the transfer member is adjusted so that the arithmetical mean deviation at a cut-off value of 0.25 mm and at a measuring length of 80 mm is within the range of 0.001 .mu.m to 0.050 .mu.m, and the ratio of the maximum height at a cut-off value of 0.25 mm and at a measuring length of 20 mm to the arithmetical mean deviation is within the range of 5:1 to 20:1.

摘要翻译： 一种制备磁记录介质的基板的方法包括以下步骤：在基片的至少一个表面上施加可辐射聚合的化合物，使转印构件的表面与由此形成的涂层的表面紧密接触 可辐射聚合的化合物，将涂层暴露于从基片或转印构件的侧面到辐射的可透过的辐射，并且将转印构件从涂层的表面分离。 调整转印部件的表面，使得截止值为0.25mm，测量长度为80mm的算术平均偏差在0.001μm至0.050μm的范围内，并且最大值 截止值为0.25mm，测量长度为20mm的算术平均偏差的高度在5：1至20：1的范围内。

公开(公告)号：US4781965A

公开(公告)日：1988-11-01

申请号：US657991

申请日：1984-10-05

申请人： Hiroshi Hashimoto ,  Noburo Hibino ,  Tsutomu Okita

发明人： Hiroshi Hashimoto ,  Noburo Hibino ,  Tsutomu Okita

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  C09D183/04 ,  G11B5/64 ,  G11B5/702 ,  G11B5/73 ,  G11B5/735 ,  G11B5/738

CPC分类号： G11B5/7026 ,  G11B5/735 ,  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 a non-magnetic layer and a magnetic layer in that order, with the surface roughness of the surface of the support on the side opposite from the magnetic layer being 0.007 .mu.m or more, and the non-magnetic layer being provided by coating and radiation-exposing a compound that is polymerizable by radiation exposure.

摘要翻译： 描述了一种磁记录介质，其包括其上涂有非磁性层和磁性层的非磁性载体，其中在与磁性层相反一侧的载体表面的表面粗糙度为0.007μm m以上，并且非磁性层通过涂布和辐射暴露通过辐射曝光可聚合的化合物而提供。