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31. 发明授权

US5747157A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5747157A
公开(公告)日：1998-05-05
申请号：US705268
申请日：1996-08-29
申请人： Hiroshi Hashimoto , Yuichiro Murayama , Masaki Satake , Tsutomu Okita
发明人： Hiroshi Hashimoto , Yuichiro Murayama , Masaki Satake , Tsutomu Okita
IPC分类号： C09D5/23 , C09D175/08 , G11B5/702 , G11B5/738
CPC分类号： G11B5/7021 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： The invention relates to a binder which improves the dispersibility of ferromagnetic powders and makes it possible to achieve a magnetic recording medium excellent in operation durability and storability, and a magnetic recording medium using such a binder. The invention provides a magnetic recording medium including a non-magnetic support substrate and a magnetic layer formed on said support substrate, said magnetic layer comprising a dispersion of ferromagnetic fine powders in a binder, wherein said binder comprises a polyurethane resin that is a reaction product obtained by using a polyol and an organic diisocyanate as main starting materials, said polyurethane resin containing as components of said polyol 15 to 40% by weight of a short-chain diol component having a cyclic structure, and 10 to 50% by weight of a long-chain polyether polyol component, and further including a polar group-containing long-chain polyol component having a molecular weight of 500 to 5,000.
摘要翻译：本发明涉及一种提高铁磁性粉末的分散性的粘合剂，能够实现操作耐久性和保存性优异的磁记录介质，以及使用这种粘合剂的磁记录介质。本发明提供了一种磁记录介质，其包括非磁性支撑基板和形成在所述支撑基板上的磁性层，所述磁性层包含铁磁细粉末在粘合剂中的分散体，其中所述粘合剂包括作为反应产物的聚氨酯树脂通过使用多元醇和有机二异氰酸酯作为主要原料，所述聚氨酯树脂作为所述多元醇的组分含有15〜40重量％的具有环状结构的短链二醇组分和10〜50重量％的长链聚醚多元醇成分，还含有分子量为500〜5000的含极性基团的长链多元醇成分。

32. 发明授权

US5525418A Magnetic recording medium having a magnetic layer containing ferromagnetic powder and a polyurethane resin obtained from a polyolefin polyol or a polybutadiene polyol 失效
标题翻译：具有含有铁磁粉末的磁性层和由聚烯烃多元醇或聚丁二烯多元醇得到的聚氨酯树脂的磁记录介质
公开(公告)号：US5525418A
公开(公告)日：1996-06-11
申请号：US364408
申请日：1994-12-23
申请人： Hiroshi Hashimoto , Yuichiro Murayama , Masaki Satake , Tsutomu Okita
发明人： Hiroshi Hashimoto , Yuichiro Murayama , Masaki Satake , Tsutomu Okita
IPC分类号： G11B5/702 , C09D5/23 , C09D175/04 , G11B5/716 , G11B5/735 , G11B5/738 , G11B5/00
CPC分类号： G11B5/7021 , G11B5/735 , G11B5/738 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/31609 , Y10T428/31935
摘要： A binder for a magnetic recording medium comprising a polyurethane which is a reaction product obtained from a polyol and a polyisocyanate as principal raw materials. The polyol is an aliphatic polyol with a molecular weight of not lower than 500. The binder has high dispersibility and provides excellent running durability and shelf stability. Also disclosed is a magnetic recording medium having at least one magnetic or non-magnetic layer containing the above-described binder on at least one surface of a non-magnetic support.
摘要翻译：一种用于磁记录介质的粘合剂，其包含作为主要原料的由多元醇和多异氰酸酯获得的反应产物的聚氨酯。多元醇是分子量不低于500的脂肪族多元醇。粘合剂具有高分散性，并提供优异的运行耐久性和储存稳定性。还公开了一种在非磁性载体的至少一个表面上具有含有上述粘合剂的至少一个磁性或非磁性层的磁记录介质。

33. 发明授权

US5458979A Magnetic recording medium having a magnetic layer comprising ferromagnetic particles, polyurethane resin and polyvinylacetal resin 失效
标题翻译：具有磁性层的磁记录介质包括铁磁颗粒，聚氨酯树脂和聚乙烯醇缩醛树脂
公开(公告)号：US5458979A
公开(公告)日：1995-10-17
申请号：US243917
申请日：1994-05-17
申请人： Hiroshi Hashimoto , Masaki Satake , Yuuichirou Murayama , Tsutomu Okita
发明人： Hiroshi Hashimoto , Masaki Satake , Yuuichirou Murayama , Tsutomu Okita
IPC分类号： C09D5/23 , C09D129/14 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/716 , G11B5/00
CPC分类号： G11B5/7022 , Y10S428/90 , Y10T428/31609 , Y10T428/31935
摘要： A magnetic recording medium comprising a nonmagnetic support having on at least one side thereof a magnetic layer comprising a ferromagnetic particle and a binder, wherein the binder comprises a polyvinyl acetal resin having a polar group and a polyurethane resin having a polar group; and a magnetic recording medium comprising (a) a nonmagnetic support having on at least one side thereof at least one of a lower magnetic layer comprising a ferromagnetic particle and a binder and a nonmagnetic layer comprising a nonmagnetic particle and a binder and (b) an upper magnetic layer comprising a ferromagnetic particle and a binder provided thereon, wherein at least the binder contained in the upper magnetic layer comprises a polyvinyl acetal resin having a polar group and a polyurethane resin having a polar group.
摘要翻译：一种包含非磁性载体的磁记录介质，其至少在其一侧具有包含铁磁颗粒和粘合剂的磁性层，其中所述粘合剂包括具有极性基团的聚乙烯醇缩醛树脂和具有极性基团的聚氨酯树脂; 和磁记录介质，其包含（a）非磁性载体，其至少在其一侧具有包含铁磁颗粒和粘合剂的下磁性层和至少一个包含非磁性颗粒和粘合剂的非磁性层，和（b）上磁性层包括铁磁颗粒和其上提供的粘合剂，其中至少包含在上磁性层中的粘合剂包含具有极性基团的聚乙烯醇缩醛树脂和具有极性基团的聚氨酯树脂。

34. 发明授权

US5079085A Magnetic recording medium containing a binder which is chemically bonded to crosslinked resin fine particles contained in the magnetic layer 失效
标题翻译：含有与磁性层中所含的交联树脂细粒化学结合的粘合剂的磁记录介质
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。

35. 发明授权

US5045351A Process for producing a magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US5045351A
公开(公告)日：1991-09-03
申请号：US423290
申请日：1989-10-18
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
CPC分类号： G11B5/7022
摘要： A process for producing a magnetic recording medium which comprises a step of kneading a ferromagnetic powder with a binder in the presence of a solvent, a step of dispersing the resulting blend with the binder and/or solvent, and a step of coating the resulting magnetic coating composition on a nonmagnetic support followed by drying;Wherein said step of kneading is carried out by kneading a ferromagnetic powder having a particle size of not more than 350 .ANG. with a glycidyl compound and a binder comprising at least a vinyl chloride copolymer having an OH- terminated side chain bonded via an organic group and also having a polar group and/or a solvent; said binder, polyurethane resin, and solvent being used in a total amount of from 40 to 70 parts by weight per 100 parts by weight of said ferromagnetic powder; and wherein said step of dispersing is carried out in the presence of additional polyurethane resin having a polar group and/or solvent.
摘要翻译：一种制造磁记录介质的方法，包括在溶剂存在下将铁磁性粉末与粘合剂混合的步骤，用粘合剂和/或溶剂分散所得共混物的步骤，以及涂覆所得磁性涂覆组合物在非磁性载体上，然后干燥; 其中所述捏合步骤是通过将具有不超过350埃格姆的粒度的铁磁性粉末与缩水甘油基化合物和包含至少一种具有通过有机基团键合有OH-封端的侧链的氯乙烯共聚物的粘合剂进行的，以及也具有极性基团和/或溶剂; 所述粘合剂，聚氨酯树脂和溶剂的使用总量为每100重量份所述铁磁粉末为40至70重量份; 并且其中所述分散步骤在具有极性基团和/或溶剂的另外的聚氨酯树脂的存在下进行。

36. 发明授权

US4976989A Method for preparing a magnetic recording medium 失效
标题翻译：磁记录介质的制备方法
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。

37. 发明授权

US4812351A Magnetic recording medium 失效
标题翻译：磁记录介质
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。

38. 发明授权

US4671998A Magnetic recording medium 失效
标题翻译：磁记录介质
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。

39. 发明授权

US5702821A Magnetic recording medium comprising ferromagnetic powder and a specified polyurethane resin 失效
标题翻译：包含铁磁粉末和特定聚氨酯树脂的磁记录介质
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。

40. 发明授权

US5578376A Magnetic recording medium having a magnetic layer comprising a specified ferromagnetic metal powder and a specified polyurethane binder 失效
标题翻译：具有磁性层的磁性记录介质包括特定的铁磁金属粉末和特定的聚氨酯粘合剂
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。

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