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公开(公告)号：US4965125A
公开(公告)日：1990-10-23
申请号：US182672
申请日：1988-04-18
申请人： Kouichi Masaki , Hideaki Kosha , Toshihiko Miura , Yasuo Tamai
发明人： Kouichi Masaki , Hideaki Kosha , Toshihiko Miura , Yasuo Tamai
CPC分类号： G11B5/708 , G11B5/71 , Y10S428/90 , Y10T428/257 , Y10T428/30
摘要： A magnetic recording medium is described, comprising a non-magnetic support having thereon a magnetic layer containing ferromagnetic particles dispersed in a binder, the ferromagnetic layer containing abrasive agent particles alone or in combination with lubricating agent particles, wherein the weight ratio of (a) the abrasive agent particles which are present, or each of the abrasive agent particles and lubricating agent particles which are present, within 1 .mu.m in a thickness direction from the surface of the magnetic layer to (b) the abrasive agent particles or each of the abrasive agent particles and lubricating agent particles which are present, within the whole magnetic layer is at least 100/(thickness of the magnetic layer -1) % in which the "thickness of the magnetic layer" represents the thickness in ".mu.m" and is 2 .mu.m or more.A method for preparing a magnetic recording medium comprising: coating on a non-magnetic support a first coating composition having ferromagnetic particles dispersed in a binder, and simultaneously or successively coating thereon a second coating composition having a binder in which there is despersed abrasive agent particles alone or in combination with lubricating agent particles.
摘要翻译： 描述了一种磁记录介质，其包括其上具有包含分散在粘合剂中的铁磁性颗粒的磁性层的非磁性载体，所述铁磁层单独地包含研磨剂颗粒或与润滑剂颗粒组合，其中（a） 存在的研磨剂颗粒或存在的研磨剂颗粒和润滑剂颗粒在从磁性层的表面到厚度方向上的1μm以内，（b）研磨剂颗粒或每个 存在于整个磁性层内的研磨剂颗粒和润滑剂颗粒至少为“μm”中的“磁性层的厚度”表示厚度的至少100 /（磁性层的厚度）％）， 是2亩以上。 一种制备磁记录介质的方法，包括：在非磁性载体上涂覆分散在粘合剂中的铁磁颗粒的第一涂料组合物，同时或依次在其上涂覆具有粘合剂的第二涂料组合物，其中存在分散的研磨剂颗粒 单独或与润滑剂颗粒组合。
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公开(公告)号：US4803121A
公开(公告)日：1989-02-07
申请号：US109013
申请日：1987-10-16
CPC分类号： G11B5/7085 , Y10S428/90 , Y10T428/257
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic fine particles, a binder, and .alpha.-alumina particles having an average size of from about 0.1 to 0.3 .mu.m, provided that the number of .alpha.-alumina particles having a particle size of larger than 0.05 .mu.m is at least equal to the number of .alpha.-alumina particles having a particle size of up to 0.05 .mu.m.
摘要翻译： 公开了一种磁记录介质，其包括非磁性载体，其上具有包含铁磁细颗粒的磁性层，粘合剂和平均尺寸为约0.1至0.3μm的α-氧化铝颗粒，条件是α 粒径大于0.05μm的氧化铝粒子至少等于粒径达0.05μm的α-氧化铝粒子的数量。
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公开(公告)号：US4728569A
公开(公告)日：1988-03-01
申请号：US799759
申请日：1985-11-19
申请人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
发明人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25
摘要： A magnetic recording medium is described, comprising a magnetic layer coated on one side of a non-magnetic support and a backing layer coated on the opposite side of the non-magnetic support, wherein the backing layer is provided after the magnetic layer has been subjected to calendering treatment and the backing layer comprises (i) non-magnetic particles including carbon black particles having an average particle diameter of from 0.1 to 1 .mu.m and (ii) a binder composition comprising from 50 to 95 wt % of a resin having a 100% modulus at 150 kg/cm.sup.2 or less based on the total weight of the binder composition, and the weight ratio of non-magnetic particles to binder composition contained in the backing layer is from 300/100 to 40/100.
摘要翻译： 描述了一种磁记录介质，其包括涂覆在非磁性载体的一侧的磁性层和涂覆在非磁性载体的相反侧上的背衬层，其中背衬层在磁性层已经经受之后提供 对于压延处理，背衬层包括（i）包括平均粒径为0.1至1μm的碳黑颗粒的非磁性颗粒和（ii）包含50至95重量％的具有 基于粘合剂组合物的总重量为150kg / cm 2或更小的100％模量，背衬层中所含的非磁性颗粒与粘合剂组合物的重量比为300/100至40/100。
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公开(公告)号：US4649072A
公开(公告)日：1987-03-10
申请号：US779348
申请日：1985-09-23
申请人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
发明人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/24942 , Y10T428/25 , Y10T428/30 , Y10T428/31551
摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer on one side and a backing layer on the other side, wherein the backing layer contains (1) non-magnetic powders containing carbon black having an average particle diameter of from 0.1 to 1 .mu.m; (2) two or more binders wherein (a) at least one of the binders is a resin having a 100% modulus of from 15 to 150 kg/cm.sup.2 in an amount of from 50 to 95 wt % based on the total amount of the binders in the backing layer, and (b) the rest binder(s) is/are a resin other than the resin having a 100% modulus of from 15 to 150 kg/cm.sup.2, and the weight ratio of all the non-magnetic powders to all the binders in the backing layer is from 300:100 to 40:100; and (3) a polyisocyanate in an amount of from 15 to 40 wt % based on the total amount of the binders in the backing layer.
摘要翻译： 一种磁记录介质，包括在一侧上设置有磁性层的磁性载体和另一侧上的背衬层，其中所述背衬层包含（1）含有平均粒径为 0.1〜1μm; （2）两种或更多种粘合剂，其中（a）至少一种粘合剂是基于总量的50至95重量％的100至100重量％的模量为15至150kg / cm 2的树脂 背衬层中的粘合剂，和（b）剩余的粘合剂是具有100％模量为15至150kg / cm 2的树脂之外的树脂，并且所有非磁性粉末的重量比 对于背衬层中的所有粘合剂为300:100至40:100; 和（3）基于背衬层中的粘合剂的总量的15至40重量％的量的多异氰酸酯。
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5.发明授权Process for preparing a backing layer of a magnetic recording medium which includes the predispersing of a fine .alpha.-Al.sub.2 O.sub.3 powder in a solvent containing a small amount of binder 失效制备磁记录介质背衬层的方法，该方法包括将α-Al2O3粉末预分散在含有少量粘合剂的溶剂中
公开(公告)号：US5039554A
公开(公告)日：1991-08-13
申请号：US607775
申请日：1990-10-30
CPC分类号： G11B5/735 , G11B5/733 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/31609
摘要： A process for preparing a magnetic recording medium by the steps of (a) forming a magnetic layer on one surface of a non-magnetic support and (b) homogeneously dispersing an .alpha.-Al.sub.2 O.sub.3 power having an average particle size of about 0.1 .mu.m or less in a solvent containing a small amount of binder to form a dispersion, mixing the thus-prepared dispersion with a binder to provide a coating composition, and applying the coating composition to the opposite surface of the nonmagnetic support to form a backing layer. The magnetic recording medium has improved wear resistance, a low friction coefficient and excellent electromagnetic properties.
摘要翻译： 一种制备磁记录介质的方法，它是通过（a）在非磁性载体的一个表面上形成磁性层的步骤和（b）均匀分散平均粒径约为0.1μm的α-Al2O3粉末或 较少在含有少量粘合剂的溶剂中以形成分散体，将由此制备的分散体与粘合剂混合以提供涂料组合物，并将涂料组合物施加到非磁性载体的相对表面以形成背衬层。 磁记录介质具有改进的耐磨性，低摩擦系数和优异的电磁特性。
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公开(公告)号：US4734325A
公开(公告)日：1988-03-29
申请号：US784076
申请日：1985-10-04
申请人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
发明人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
IPC分类号： C09D5/23 , C09D127/04 , C09D175/00 , C09D175/04 , G11B5/73 , G11B5/735 , G11B5/70
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/257
摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer being provided on one surface of the support and a backing layer being provided on the surface of the support opposite to said magnetic layer, the backing layer contains binder and non-magnetic particles comprised of (i) corbon black having an average particle size of 0.1 to 1.0 .mu.m and (ii) particles of abrasives having a Mohs' hardness of at least 6 and an average particle size of 1 .mu.m or less, with the non-magnetic particles in said backing layer being used in an amount of 40 to 300 parts by weight per 100 parts by weight of binder.
摘要翻译： 一种磁记录介质，包括在其上设置有磁性层的非磁性载体，所述磁性层设置在所述载体的一个表面上，背衬层设置在所述载体的与所述磁性层相对的表面上，所述背衬层包含粘合剂和非磁性层， 磁性粒子由（i）平均粒径为0.1〜1.0μm的cor黑，（ⅱ）莫氏硬度至少为6，平均粒径为1μm以下的磨料颗粒组成， 所述背衬层中的非磁性颗粒的使用量为每100重量份粘合剂为40至300重量份。
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公开(公告)号：US4686139A
公开(公告)日：1987-08-11
申请号：US778468
申请日：1985-09-20
申请人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
发明人： Katsumi Ryoke , Nobutaka Yamaguchi , Masatoshi Takahashi , Kazuko Hanai , Hideaki Kosha , Eiichi Tadokoro
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D163/00 , G11B5/73 , G11B5/735 , G11B5/68 , G11B5/708
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium is described, comprising a non-magnetic support having a magnetic layer and a backing layer which is provided on the surface of the support opposite to the magnetic layer, the backing layer containing (a) non-magnetic particles comprising carbon black having an average particle diameter of 0.1 to 1.0 .mu.m, (b) a binder comprising (i) a resin having 150 kg/cm.sup.2 or less of 100% modulus in an amount of at least 50 wt % based on the total amount of binder, and (ii) a diphenyl methane diisocyanate type hardening agent, with the amount of non-magnetic particles to total contained in the backing layer being 40 to 300 parts by weight of non-magnetic particles per 100 parts by weight of binder.
摘要翻译： 描述了一种磁记录介质，其包括具有磁性层的非磁性载体和设置在与磁性层相对的支撑体的表面上的背衬层，背衬层包含（a）包含炭黑的非磁性颗粒 平均粒径为0.1〜1.0μm，（b）粘合剂，其包含（i）相对于粘合剂的总量为150kg / cm 2以下的100质量％以上的模量为50重量％以上的树脂 ，和（ii）二苯基甲烷二异氰酸酯型硬化剂，相对于每100重量份粘合剂，背衬层中总含有的非磁性颗粒的量为40〜300重量份的非磁性颗粒。
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公开(公告)号：US4886703A
公开(公告)日：1989-12-12
申请号：US183105
申请日：1988-04-19
申请人： Kazuo Hasumi , Hideomi Watanabe , Tsutomu Okita , Katsumi Ryoke , Hideaki Kosha
发明人： Kazuo Hasumi , Hideomi Watanabe , Tsutomu Okita , Katsumi Ryoke , Hideaki Kosha
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/64 , G11B5/73 , G11B5/735
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium comprising a support having provided on one surface thereof a magnetic layer comprising a binder and ferromagnetic particles dispersed therein, and on the opposite surface thereof a backing layer comprising a binder and non-magnetic particles dispersed therein, wherein at least one of the binders comprises a vinyl chloride copolymer resin having a vinyl chloride unit content of about 70 wt % or more based on the total amount of the binder, a nitrogen content of about from 0.01 to 1 wt % based on the total amount of the binder, and a polymerization degree of about from 250 to 700; and the non-magnetic particles comprises fine carbon particles having a DBP oil absorption of about 150 ml/100 g or more.
摘要翻译： 一种磁记录介质，包括在其一个表面上设置有包含粘合剂和分散在其中的铁磁性颗粒的磁性层的支撑体，并且在其相对表面上具有包含粘合剂和分散在其中的非磁性颗粒的背衬层，其中至少一个 粘合剂包含基于粘合剂总量为约70重量％以上的氯乙烯单元含量的氯乙烯共聚物树脂，相对于粘合剂的总量，氮含量为约0.01〜1重量％ 聚合度约为250〜700; 非磁性粒子包含DBP吸油量为150ml / 100g以上的细小碳粒子。
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公开(公告)号：US4759979A
公开(公告)日：1988-07-26
申请号：US927464
申请日：1986-11-06
申请人： Hideaki Kosha , Kiyomi Ejiri
发明人： Hideaki Kosha , Kiyomi Ejiri
CPC分类号： G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium is disclosed which comprises a non-magnetic support having coated thereon a magnetic layer containing a specific amount of a specific acicular Cr.sub.2 O.sub.3 along with alpha-Al.sub.2 O.sub.3, SiC, and/or TiC, which medium shows excellent surface properties and electromagnetic properties, as well as improved running durability.
摘要翻译： 公开了一种磁记录介质，其包括其上涂覆有含有特定量的特定针状Cr 2 O 3以及α-Al 2 O 3，SiC和/或TiC的磁性层的非磁性载体，该介质显示出优异的表面性质和电磁特性 ，以及改善运行耐久性。
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公开(公告)号：US4740418A
公开(公告)日：1988-04-26
申请号：US843973
申请日：1986-03-25
申请人： Hideaki Kosha , Takahito Miyoshi
发明人： Hideaki Kosha , Takahito Miyoshi
CPC分类号： G11B5/7085 , Y10S428/90 , Y10T428/25 , Y10T428/256
摘要： A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, characterized in that said magnetic recording layer contains an acicular inorganic powder which has a Mohs' scale of hardness of not less than 5, a length of not longer than 1.0 .mu.m, a thickness of not thicker than 0.1 .mu.m, and an aspect ratio in the range of 5 to 20.
摘要翻译： 一种包含非磁性载体和设置在所述载体上的磁记录层的磁记录介质，所述磁记录层包含分散在粘合剂中的铁磁性粉末，其特征在于，所述磁记录层含有具有莫氏体积的针状无机粉末 硬度不小于5，长度不大于1.0μm，厚度不大于0.1μm，纵横比在5至20的范围内。
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