公开(公告)号：US5908691A

公开(公告)日：1999-06-01

申请号：US772575

申请日：1996-12-26

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 ,  C09D175/04 ,  G11B5/702 ,  G11B5/738

CPC分类号： G11B5/738 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/31609

摘要： The present invention provides a magnetic recording medium having high durability and excellent electromagnetic transfer characteristics and having a lower coating layer, which contains a binder and has high dispersion property and durability. The magnetic recording medium comprises a lower coating layer where non-magnetic powder or ferromagnetic power is dispersed in a binder and an upper magnetic layer where ferromagnetic powder is dispersed in a binder, said two layers being placed on a non-magnetic support member, whereby the binder of the lower coating layer comprises polyurethane resin, which is a reaction product using diol and organic diisocyanate as major materials, the polyurethane resin contains short-chain diol having cyclic structure by 17 to 40 weight %, and the polyurethane resin contains long-chain diol, containing ether groups by 1.0 to 5.0 mmol/g to the entire polyurethane resin, by 10 to 50 weight %.

摘要翻译： 本发明提供一种具有高耐久性和优异的电磁传递特性的磁记录介质，并具有包含粘合剂并具有高分散性和耐久性的下涂层。 磁记录介质包括其中非磁性粉末或铁磁力分散在粘合剂中的下涂层和将铁磁性粉末分散在粘合剂中的上磁性层，所述两层位于非磁性支撑构件上，由此 下涂层的粘合剂包含聚氨酯树脂，其是使用二醇和有机二异氰酸酯作为主要材料的反应产物，所述聚氨酯树脂包含具有17至40重量％的环状结构的短链二醇，并且所述聚氨酯树脂包含长链， 链状二醇，含有醚基团，1.0〜5.0mmol / g，相对于整个聚氨酯树脂，为10〜50重量％。

公开(公告)号：US4959263A

公开(公告)日：1990-09-25

申请号：US195224

申请日：1988-05-18

申请人： Masashi Aonuma ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Hiroaki Araki ,  Kiyotaka Fukino ,  Kiyomi Ejiri

发明人： Masashi Aonuma ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Hiroaki Araki ,  Kiyotaka Fukino ,  Kiyomi Ejiri

IPC分类号： G11B5/702 ,  G11B5/712 ,  G11B5/714

CPC分类号： G11B5/7026 ,  G11B5/712 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/257

摘要： A magnetic recording medium is described, comprising a nonmagnetic support having thereon a magnetic layer containing a binder which is cross-linkable or polymerizable by radiation irradiation and ferromagnetic particles, the ferromagnetic particles being metal or metal alloy particles mainly comprising iron having a crystal size of 300 .ANG. or less, having an atomic ratio of oxygen atoms to iron atoms of from 1.6 to 3.0 on the surface of the particles, and the magnetic layer having been irradiated with radiation, and comprising a nonmagnetic support having thereon a magnetic layer containing a binder comprising thermoplastic resins, thermosetting resins, reactive type resins and mixtures thereof and ferromagnetic particles, said ferromagnetic particles being metal or metal alloy particles mainly comprising iron having a crystal size of 250 .ANG. or less, and having an atomic ratio of oxygen atoms to iron atoms of from 1.6 to 3.0 on the surface of said particles.

摘要翻译： 描述了一种磁记录介质，其包括其上具有含有可通过辐射照射和铁磁性颗粒可交联或可聚合的粘合剂的磁性层的非磁性载体，所述铁磁颗粒是主要包含具有晶体尺寸的铁的金属或金属合金颗粒 300或更小，在颗粒表面上的氧原子与铁原子的原子比为1.6至3.0，并且已经辐照辐照的磁性层，并且包含其上具有含有粘合剂的磁性层的非磁性载体 包括热塑性树脂，热固性树脂，反应型树脂及其混合物和铁磁颗粒，所述铁磁性颗粒是主要包含结晶尺寸为250或更小的铁并且具有氧原子与铁原子的原子比的金属或金属合金颗粒 在所述颗粒的表面上为1.6至3.0。

公开(公告)号：US4664965A

公开(公告)日：1987-05-12

申请号：US684319

申请日：1984-12-20

申请人： Tsutomu Okita ,  Hiroshi Hashimoto ,  Yoshito Mukaida

发明人： Tsutomu Okita ,  Hiroshi Hashimoto ,  Yoshito Mukaida

IPC分类号： G11B5/73 ,  G11B5/704

CPC分类号： G11B5/7305 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/24413 ,  Y10T428/24942 ,  Y10T428/265 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium is disclosed, which comprises a non-magnetic support having a surface roughness of not less than 0.01 .mu.m having thereon an intermediate layer and a magnetic layer, the intermediate layer comprising a polyester polyol having at least two acryloyl and/or methacryloyl groups in the molecule thereof, which has been polymerization-hardened by exposure to radiation. The magnetic recording medium has markedly improved video sensitivity, C/N ratio and adhesiveness between the support and the magnetic layer.

摘要翻译： 公开了一种磁记录介质，其包括表面粗糙度不小于0.01μm的非磁性载体，其上具有中间层和磁性层，所述中间层包含具有至少两个丙烯酰基和/或 其分子中的甲基丙烯酰基已经通过暴露于辐射聚合硬化。 磁记录介质显着提高了视频灵敏度，C / N比和支持层与磁性层之间的粘合性。

公开(公告)号：US5258231A

公开(公告)日：1993-11-02

申请号：US908916

申请日：1992-07-02

申请人： Tsutomu Okita ,  Yasuo Nishikawa ,  Hiroshi Hashimoto ,  Hideomi Watanabe

发明人： Tsutomu Okita ,  Yasuo Nishikawa ,  Hiroshi Hashimoto ,  Hideomi Watanabe

IPC分类号： G11B5/702 ,  G11B5/00

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

摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a ferromagnetic powder and a binder material, wherein the magnetic layer contains at least a vinyl chloride copolymer binder having at least one polar group selected from --SO.sub.3 M and --COOM, wherein M represents a hydrogen atom, an alkali metal, or an ammonium ion, and at least one epoxy group per molecule in an amount of 1.times.10.sup.-4 to 1.times.10.sup.-2 per gram, and a fatty acid amide having from 12 to 26 atoms and present in an amount of from 0.05 to 2 wt % based on the amount of the ferromagnetic powder, and wherein the content of the polar group in the vinyl chloride copolymer binder is from about 1.times.10.sup.-7 to 1.times.10.sup.-3 equivalent per gram, and wherein the vinyl chloride copolymer binder has a weight average molecular weight of from 20,000 to 100,000 and wherein the magnetic layer further contains a polyurethane resin having a polar group.

摘要翻译： 一种磁记录介质，包括非磁性载体，其上设置有包含铁磁性粉末和粘合剂材料的磁性层，其中所述磁性层至少含有具有至少一个选自-SO 3 M和-COOM的极性基团的氯乙烯共聚物粘合剂 ，其中M表示氢原子，碱金属或铵离子，每分子中至少一个环氧基团的量为1×10 -4至1×10 -2 /克，具有12至26个原子的脂肪酸酰胺 并且以铁磁粉末的量计为0.05-2重量％，其中氯乙烯共聚物粘合剂中极性基团的含量为每克约1×10-7至1×10-3当量， 其中所述氯乙烯共聚物粘合剂的重均分子量为20,000至100,000，并且其中所述磁性层还含有具有极性基团的聚氨酯树脂。

公开(公告)号：US5141808A

公开(公告)日：1992-08-25

申请号：US309576

申请日：1989-02-13

申请人： Hiroshi Hashimoto ,  Kazuo Hasumi ,  Tsutomu Okita

发明人： Hiroshi Hashimoto ,  Kazuo Hasumi ,  Tsutomu Okita

IPC分类号： C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/716

CPC分类号： G11B5/716 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/31554 ,  Y10T428/3158 ,  Y10T428/31609

摘要： A magnetic recording medium comprising a nonmagnetic support having thereon a lower magnetic layer and a upper magnetic layer, in this order, wherein the lower magnetic layer contains as a binder a polyurethane reisn having a number average molecular weight of less than 25,000, and the upper magnetic layer contains as a binder (a) a polyurethane resin having (i) at least three organic groups having an active hydrogen per polyurethane molecule and (ii) a number average molecular weight of 25,000 or more, and (b) a polyisocyanate.

摘要翻译： 一种磁记录介质，其具有依次具有下磁性层和上磁性层的非磁性载体，其中下磁性层含有作为粘合剂的数均分子量小于25,000的聚氨酯弹性体， 磁性层包含作为粘合剂的（a）聚氨酯树脂，其具有（i）至少三个每个聚氨酯分子具有活性氢的有机基团和（ii）数均分子量为25,000以上，和（b）多异氰酸酯。

公开(公告)号：US5084341A

公开(公告)日：1992-01-28

申请号：US421025

申请日：1989-10-13

申请人： Hiroshi Hashimoto ,  Tsutomu Okita ,  Kiyomi Ejiri

发明人： Hiroshi Hashimoto ,  Tsutomu Okita ,  Kiyomi Ejiri

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

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/31609

摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising ferromagnetic metal particles dispersed in a binder, wherein said ferromagnetic metal particles have a crystalline size of 250 .ANG. or less, and said binder comprises(i) a polyurethane resin having an S-containing group which is at least one member selected from the group consisting of --SH, ##STR1## said polyurethane resin being one which has been synthesized by the use of a polyhydric alcohol, as a crosslinking agent, having at least three hydroxyl groups and has a branched and crosslinked structure,(ii) a vinyl chloride resin containing an --OH group and a polar group which is at least one member selected from the group consisting of --SO.sub.3 M, --SO.sub.4 M, --OPO(OM).sub.2, --PO(OM).sub.2, --COOM, --NR.sub.2 and --NR.sub.3.sup..sym. (wherein M represents a hydrogen atom or an alkali metal, and R represents an alkyl group having up to 4 carbon atoms), and(iii) a polyisocyanate compound.

摘要翻译： 一种磁记录介质，包括非磁性载体，其上设置有包含分散在粘合剂中的铁磁金属颗粒的磁性层，其中所述强磁性金属颗粒的结晶尺寸为250纳米或更小，并且所述粘合剂包括（i）聚​​氨酯树脂 具有含S基团，其是选自-SH，所述聚氨酯树脂中的至少一种，所述聚氨酯树脂是通过使用多元醇合成的聚氨酯树脂作为交联剂，其具有至少三个 羟基，并且具有支链和交联结构，（ii）含有-OH基团和极性基团的氯乙烯树脂，其是选自-SO 3 M，-SO 4 M，-OPO（OM）2中的至少一种 ，-PO（OM）2，-COOM，-NR2和-NR3（+）（其中M表示氢原子或碱金属，R表示具有至多4个碳原子的烷基），和（iii） 多异氰酸酯化合物。

公开(公告)号：US5082733A

公开(公告)日：1992-01-21

申请号：US340617

申请日：1989-04-18

申请人： Hideomi Watanabe ,  Mikio Ohno ,  Hiroshi Hashimoto ,  Tsutomu Okita

发明人： Hideomi Watanabe ,  Mikio Ohno ,  Hiroshi Hashimoto ,  Tsutomu Okita

IPC分类号： G11B5/842 ,  G11B5/712

CPC分类号： G11B5/712 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/2998

摘要： A method for preparing a magnetic recording medium is disclosed, comprising the steps of (1) surface-treating ferromagnetic particles with a glycidyl compound having a molecular weight of 1,000 or less and having an epoxy equivalent of 200 g/eq. or less, (2) dispersing the surface-treated ferromagnetic particles with a binder to prepare a magnetic coating composition, (3) coating the resulting magnetic coating composition on a nonmagnetic support, and then (4) drying the magnetic coating composition.

摘要翻译： 公开了一种制备磁记录介质的方法，包括以下步骤：（1）用分子量为1,000或更小的环氧当量为200g / eq的缩水甘油基化合物对铁磁颗粒进行表面处理。 （2）用粘合剂分散表面处理的铁磁颗粒以制备磁性涂料组合物，（3）将所得磁性涂料组合物涂布在非磁性载体上，然后（4）干燥磁性涂料组合物。

公开(公告)号：US5061564A

公开(公告)日：1991-10-29

申请号：US382934

申请日：1989-07-21

申请人： Takao Ohya ,  Jun Nakagawa ,  Satoru Hayakawa ,  Yasuo Nishikawa ,  Tsutomu Okita ,  Hiroshi Hashimoto

发明人： Takao Ohya ,  Jun Nakagawa ,  Satoru Hayakawa ,  Yasuo Nishikawa ,  Tsutomu Okita ,  Hiroshi Hashimoto

IPC分类号： G11B5/71 ,  G11B5/72

CPC分类号： G11B5/71 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/31 ,  Y10T428/31551 ,  Y10T428/3158

摘要： A magnetic recording medium is disclosed, which comprises a non-magnetic support having provided thereon a magnetic layer mainly composed of a ferromagnetic powder and a binder resin comprising (i) a polymer having at least one polar group selected from --SO.sub.3 M.sup.1, --OSO.sub.3 M.sup.1, --COOM.sup.1, ##STR1## wherein M.sup.1 represents a hydrogen atom, Li, Na or NR.sub.4 (wherein R represents a hydrogen atom, an alkyl group, an alkenyl group, or an alkanol group), and M.sup.2 represents a hydrogen atom, Li, Na, an alkyl group, or NR.sub.4 (wherein R has the same significance as defined above); or (ii) a compound having at least one polar group selected from --SO.sub.3 M.sup.3, --COOM.sup.3, and --PO.sub.3 (M.sup.3).sub.2 (wherein M.sup.3 represents a hydrogen atom, an alkali metal, or an ammonium group) and containing at least one carbon-carbon unsaturated bond in the molecule, said magnetic layer containing at least one ester compound represented by following formula (I), (II), or (III), and when the binder resin comprises the compound (ii), the magnetic layer is irradiated by radiations: ##STR2## wherein R.sup.1 represents a straight chain or branched alkyl group having from 7 to 29 carbon atoms or a straight chain or branched alkenyl group having from 7 to 29 carbon atoms; l, k, m, and n represents an integer; l and n each is at least 2, and the sum of n and m and the sum of k and l are from 7 to 33.

摘要翻译： 公开了一种磁记录介质，其包括其上设置有主要由铁磁粉末和粘合剂树脂构成的磁性层的非磁性载体，所述磁性层包含（i）具有至少一个选自-SO 3 M 1，-OSO 3 M 1， -COOM1，其中M1表示氢原子，Li，Na或NR4（其中R表示氢原子，烷基，烯基或链烷醇基），M2表示氢原子，Li，Na ，烷基或NR4（其中R具有与上述相同的含义）; 或（ii）具有选自-SO 3 M 3，-COOM 3和-PO 3（M3）2中的至少一个极性基团的化合物（其中，M3表示氢原子，碱金属或铵基），并且含有至少一个碳 所述磁性层含有至少一种由下式（I），（II）或（III）表示的酯化合物，并且当粘合剂树脂包含化合物（ii）时，磁性层为 （I）其中R1表示具有7至29个碳原子的直链或支链烷基或具有7个碳原子的直链或支链烯基 至29个碳原子; l，k，m，n表示整数; l和n各自为至少2，n和m之和以及k和l之和为7至33。

公开(公告)号：US4716077A

公开(公告)日：1987-12-29

申请号：US884450

申请日：1986-07-11

申请人： Tsutomu Okita ,  Hiroshi Hashimoto ,  Masashi Aonuma

发明人： Tsutomu Okita ,  Hiroshi Hashimoto ,  Masashi Aonuma

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/14 ,  G11B5/702 ,  G11B5/73

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium is described, comprising a non-magnetic support and a magnetic layer, said magnetic layer containing as a binder at least one compound selected from each of compound groups (A) and (B) that has been exposed to radiation, wherein(A) is polyvinyl chloride type compounds containing at least one polar group and at least one carbon-carbon unsaturated bond per molecule; and(B) is polyurethane type compounds containing at least one --CO.sub.2 H group and at lease one carbon-carbon unsaturated bond per molecule.

摘要翻译： 描述了一种磁记录介质，其包括非磁性载体和磁性层，所述磁性层含有至少一种选自化合物组（A）和（B）中的每一种已被暴露于辐射的化合物作为粘合剂，其中 （A）是每分子含有至少一个极性基团和至少一个碳 - 碳不饱和键的聚氯乙烯型化合物; 和（B）是每分子含有至少一个-CO 2 H基团和至少一个碳 - 碳不饱和键的聚氨酯型化合物。

公开(公告)号：US4707380A

公开(公告)日：1987-11-17

申请号：US875259

申请日：1986-06-17

申请人： Hiroshi Hashimoto ,  Tsutomu Okita ,  Yoshito Mukaida

发明人： Hiroshi Hashimoto ,  Tsutomu Okita ,  Yoshito Mukaida

IPC分类号： G11B5/73 ,  G11B5/84 ,  H01F10/02

CPC分类号： G11B5/84 ,  G11B5/7305

摘要： A process for preparing a magnetic recording medium is described, comprising subjecting a surface of a non-magnetic support having a surface roughness of not less than 0.01 .mu.m to a non-contact surface treatment, providing a layer containing a compound polymerizable by radiation exposure on the surface of the support, exposing said layer to radiation, and then providing a magnetic layer on the radiation-exposed layer.

摘要翻译： 描述了一种制备磁记录介质的方法，包括使表面粗糙度不小于0.01μm的非磁性载体的表面进行非接触表面处理，从而提供含有通过辐射曝光可聚合的化合物的层 在支撑体的表面上，将所述层暴露于辐射，然后在辐射暴露层上提供磁性层。