公开(公告)号：US5097792A

公开(公告)日：1992-03-24

申请号：US490742

申请日：1990-03-08

申请人： Masahiro Umemura ,  Setsuko Kawahara ,  Takemasa Namiki ,  Seiichi Tobisawa ,  Shigetoshi Kawabe ,  Takeshi Nakajima ,  Yasushi Nakano ,  Noboru Koyama

发明人： Masahiro Umemura ,  Setsuko Kawahara ,  Takemasa Namiki ,  Seiichi Tobisawa ,  Shigetoshi Kawabe ,  Takeshi Nakajima ,  Yasushi Nakano ,  Noboru Koyama

IPC分类号： B05C5/02 ,  B05C9/06 ,  G03C1/74 ,  G11B5/716 ,  G11B5/848

CPC分类号： B05C9/06 ,  B05C5/0254 ,  G03C1/74 ,  G11B5/716 ,  G11B5/848 ,  G03C2001/7407 ,  G03C2001/7459 ,  G03C2001/7466

摘要： A coating apparatus having a first slot between its front and center edges and a second slot between its center and back edges, wherein a coating solution is extruded continuously from each of the slots onto the surface of a flexible support running continuously along the edge surfaces of the front, center, and back edges in that order.The front edge surface has a straight-line portion on at least the terminal end portion of the front edge so that the straight-line portion extends along the direction of movement of the support and is not longer than one mm, and at least one portion of the center and back edge surfaces protrudes from the extension line of the straight-line toward the support.The coating apparatus is suitable for preparing magnetic recording media.

公开(公告)号：US5284716A

公开(公告)日：1994-02-08

申请号：US573115

申请日：1990-09-05

申请人： Yasushi Nakano ,  Yoshitaka Yasufuku ,  Noboru Koyama ,  Masahiro Umemura ,  Takemasa Namiki ,  Seiichi Tobisawa ,  Shigetoshi Kawabe ,  Takeshi Nakajima

发明人： Yasushi Nakano ,  Yoshitaka Yasufuku ,  Noboru Koyama ,  Masahiro Umemura ,  Takemasa Namiki ,  Seiichi Tobisawa ,  Shigetoshi Kawabe ,  Takeshi Nakajima

IPC分类号： G11B5/706 ,  G11B5/712 ,  G11B5/714 ,  G11B5/716 ,  B32B5/16 ,  G11B5/66

CPC分类号： G11B5/716 ,  G11B5/706 ,  G11B5/712 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed which comprises a first magnetic layer on a nonmagnetic support and a second magnetic layer on the first magnetic layer.The first magnetic layer contains A parts by weight of at least one of Si and Al per 100 parts by weight of magnetic materials, and the second magnetic layer contains B parts by weight of at least one of Si and Al per 100 parts by weight of magnetic materials, wherein A is smaller than B.This magnetic recording medium is characterized in that: the magnetic recording medium does not stain the conveyance rollers in the manufacturing process; problems which tend to occur when running conventional tapes are greatly reduced; and it is suitable for use as a video tape.

摘要翻译： PCT No.PCT / JP90 / 00060 Sec。 371 1990年9月5日第 102（e）1990年9月5日PCT PCT 1990年1月19日PCT公布。 出版物WO90 / 08380 日本1990年7月26日。公开了一种磁记录介质，其包括在非磁性载体上的第一磁性层和第一磁性层上的第二磁性层。 相对于每100重量份的磁性材料，第一磁性层含有A重量份的Si和Al中的至少一种，第二磁性层包含B重量份的Si和Al中的至少一种，相对于每100重量份的 磁性材料，其中A小于B.该磁记录介质的特征在于：磁记录介质在制造过程中不会污染输送辊; 运行常规磁带时倾向于发生的问题大大减少; 并且它适合用作录像带。

公开(公告)号：US5035856A

公开(公告)日：1991-07-30

申请号：US475131

申请日：1990-02-05

申请人： Noboru Koyama ,  Yasushi Nakano ,  Yoshitaka Yasufuku ,  Setsuko Kawahara ,  Takemasa Namiki ,  Shigetoshi Kawabe ,  Masahiro Umemura

发明人： Noboru Koyama ,  Yasushi Nakano ,  Yoshitaka Yasufuku ,  Setsuko Kawahara ,  Takemasa Namiki ,  Shigetoshi Kawabe ,  Masahiro Umemura

IPC分类号： G11B5/708 ,  G11B5/716

CPC分类号： G11B5/7085 ,  G11B5/716 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

摘要： A magnetic recording medium having plural magnetic layers is disclosed. The uppermost magnetic layer contains an abrasive with an average particle diameter of not more than 0.3 .mu.m, and a magnetic layer other than the uppermost magnetic layer contains an abrasive with an average particle diameter of not less than 0.3 .mu.m. The medium is improved in the electromagnetic conversion characteristics and sliding noise.

公开(公告)号：US5084335A

公开(公告)日：1992-01-28

申请号：US407337

申请日：1989-09-14

申请人： Yasushi Nakano ,  Setsuko Kawahara ,  Kikuo Oonuma ,  Masahiro Umemura ,  Seiichi Tobisawa ,  Takeshi Nakajima

发明人： Yasushi Nakano ,  Setsuko Kawahara ,  Kikuo Oonuma ,  Masahiro Umemura ,  Seiichi Tobisawa ,  Takeshi Nakajima

IPC分类号： G11B5/708 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/714 ,  G11B5/716

CPC分类号： G11B5/702 ,  G11B5/714 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/258 ,  Y10T428/259 ,  Y10T428/26 ,  Y10T428/265 ,  Y10T428/31554 ,  Y10T428/3158 ,  Y10T428/31609

摘要： A magnetic recording medium improved in the magnetic recording characteristics, running properties and durability is disclosed. The magnetic recording medium comprises a non-magnetic support having on a side of the support an upper magnetic layer positioned farther from the support and a lower magnetic layer positioned closer to the support. The upper magnetic layer comprises a binder, a magnetic powder having an original BET specific surface area of not less than than 30 m.sup.2 /g and at least one abrasive selected from alumina, silicon carbide, Cr.sub.2 O.sub.3, silica, .alpha.-Fe.sub.2 O.sub.3, TiO.sub.2 and zilconia in a portion of 3 to 20 parts per 100 parts by weight of the magnetic powder, and the lower magnetic layer comprises a binder and a magnetic powder having an original BET specific surface area of less than 30 m.sup.2 /g, and kinds of the binders each contained in the upper magnetic layer and the lower magnetic layer are the same.

公开(公告)号：US5093192A

公开(公告)日：1992-03-03

申请号：US495384

申请日：1990-03-16

申请人： Setsuko Kawahara ,  Yasushi Nakano ,  Noboru Koyama ,  Masahiro Umemura

发明人： Setsuko Kawahara ,  Yasushi Nakano ,  Noboru Koyama ,  Masahiro Umemura

IPC分类号： G11B5/702 ,  G11B5/714 ,  G11B5/716

CPC分类号： G11B5/702 ,  G11B5/714 ,  G11B5/716 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/31609

摘要： A magnetic recording medium which has improved electromagnetic conversion characteristics and running ability and is suitable for high-density recording. The magnetic recording medium has at least two magnetic layers which are provided on one side of a support. One of said magnetic layers contains magnetic particles having an aspect ratio of from 3 to less than 8 and the other one contains magnetic particles having an aspect ration of from 8 to 12.

公开(公告)号：US5089333A

公开(公告)日：1992-02-18

申请号：US621782

申请日：1990-12-04

申请人： Setsuko Kawahara ,  Noboru Koyama ,  Yasushi Nakano ,  Noboru Nakajima

发明人： Setsuko Kawahara ,  Noboru Koyama ,  Yasushi Nakano ,  Noboru Nakajima

IPC分类号： G11B5/708 ,  G11B5/716

CPC分类号： G11B5/708 ,  G11B5/716 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/30

摘要： A magnetic recording medium is disclosed, which has excellent electro-magnetic conversion characteristics and is improved in drop-out. The magnetic recording medium comprises a non-magnetic support and a plurality of magnetic layers provided on the support, and the magnetic layer being provided farthest from said support among these magnetic layers comprises a magnetic powder and a carbon black in an amount of not more than 1 part per 100 parts by weight of said magnetic powder; and another magnetic layer comprising a magnetic powder has a thickness of not more than 2.5 .mu.m, and 900 nm light-transmittance of said magnetic medium is not more than 0.1%.

公开(公告)号：US5098785A

公开(公告)日：1992-03-24

申请号：US439800

申请日：1989-11-21

申请人： Takafumi Yanagita ,  Tsutomu Kempo ,  Narito Goto ,  Takuo Nishikawa ,  Noboru Koyama ,  Yasushi Nakano ,  Setsuko Kawahara

发明人： Takafumi Yanagita ,  Tsutomu Kempo ,  Narito Goto ,  Takuo Nishikawa ,  Noboru Koyama ,  Yasushi Nakano ,  Setsuko Kawahara

IPC分类号： C08G18/08 ,  G11B5/702 ,  G11B5/718 ,  G11B5/738

CPC分类号： C08G18/0833 ,  G11B5/7021 ,  G11B5/7023 ,  G11B5/718 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/3158 ,  Y10T428/31609

摘要： A medium recording medium is provided which has a plurality of coated layers on a nonmagnetic base support, a least one of said coated layer containing a modified copolymer having introduced therein an anionic functional group which forms an intramolecular salt.

摘要翻译： 提供了一种介质记录介质，其在非磁性基体载体上具有多个涂覆层，所述涂层中至少一个含有引入了形成分子内盐的阴离子官能团的改性共聚物。

公开(公告)号：US5026598A

公开(公告)日：1991-06-25

申请号：US448664

申请日：1989-12-11

申请人： Noboru Koyama ,  Yasushi Nakano ,  Setsuko Kawahara ,  Noboru Nakajima

发明人： Noboru Koyama ,  Yasushi Nakano ,  Setsuko Kawahara ,  Noboru Nakajima

IPC分类号： G11B5/708 ,  G11B5/714 ,  G11B5/716

CPC分类号： G11B5/716 ,  G11B5/708 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/30

摘要： There is disclosed a magnetic recording medium comprising a support and provided thereon a plurality of layers. The layers comprise an outermost magnetic layer and a lower magnetic layer, wherein the outermost magnetic layer contains carbon black having an average primary particle size ranging from 40 m.mu. to 300 m.mu., and the lower magnetic layer contains carbon black having an average primary particle size ranging from 5 m.mu. to 30 m.mu..

公开(公告)号：US5093193A

公开(公告)日：1992-03-03

申请号：US498327

申请日：1990-03-23

申请人： Noboru Koyama ,  Setsuko Kawahara ,  Yasushi Nakano

发明人： Noboru Koyama ,  Setsuko Kawahara ,  Yasushi Nakano

IPC分类号： G11B5/706 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/716 ,  G11B5/84 ,  G11B5/842

CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording medium and its manufacturing method are disclosed. The medium comprises a non-magnetic support and, provided thereon, a first magnetic layer coated by a first magnetic coating solution and a second magnetic layer coated by a second magnetic coating solution in this order, wherein a dry thickness of the first magnetic layer represented by .mu.m, t.sub.1, a dry thickness of the second magnetic layer represented by .mu.m, t.sub.2, the solid content of the first magnetic coating solution represented by weight %, W.sub.1, and the solid content of the second magnetic coating solution represented by weight %, W.sub.2 have the following relation,2.0.ltoreq.(t.sub.1 /W.sub.1) / (t.sub.2 /W.sub.2).ltoreq.15.0

摘要翻译： 公开了一种磁记录介质及其制造方法。 所述介质包括非磁性载体，并且在其上设置由第一磁性涂层溶液涂覆的第一磁性层和由第二磁性涂层溶液涂覆的第二磁性层，其中所述第一磁性层的干燥厚度表示为 以μm为单位，以μm为单位表示第二磁性层的干燥厚度，t2，以重量％表示的第一磁性涂层溶液的固体含量，W1和以重量计的第二磁性涂层溶液的固体含量 ％，W2具有以下关系：2.0

公开(公告)号：US5151323A

公开(公告)日：1992-09-29

申请号：US588689

申请日：1990-09-28

申请人： Setsuko Kawahara ,  Yasushi Nakano ,  Noboru Koyama

发明人： Setsuko Kawahara ,  Yasushi Nakano ,  Noboru Koyama

IPC分类号： C09C1/48 ,  C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B5/716 ,  G11B5/73 ,  G11B5/735 ,  G11B5/84 ,  G11B5/842

CPC分类号： G11B5/716 ,  G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/30

摘要： A magnetic recording medium and manufacturing method thereof are disclosed. The recording medium comprisesa support,a plurality of magnetic layer being provided on a surface of the support, anda backcoat layer being provided on the other surface of the support and comprising a binder and a carbon black, whereinan outermost magnetic layer being provided at the outermost portion from the support among said plurality of magnetic layers comprises, a binder, a magnetic powder and a carbon black in which the weight ratio of the carbon black to the magnetic powder is 0.1 to 0.5 percent,a magnetic layer other than the outermost magnetic layer comprises a binder, a magnetic powder different from the magnetic powder contained in the outermost layer and a carbon black in which the weight ratio of the carbon black to the magnetic powder is zero to 0.4 percent.The plurality of magnetic layers are coated on the support under a condition of wet on wet.

摘要翻译： 公开了一种磁记录介质及其制造方法。 记录介质包括支撑体，多个磁性层设置在支撑体的表面上，背涂层设置在载体的另一个表面上，并且包括粘合剂和炭黑，其中提供最外层的磁性层 在所述多个磁性层的支撑体的最外侧部分包括粘合剂，磁性粉末和炭黑，其中炭黑与磁性粉末的重量比为0.1〜0.5％，除了 最外层的磁性层包括粘合剂，不同于最外层中所含的磁粉的磁性粉末和炭黑与磁粉的重量比为0〜0.4％的炭黑。 多个磁性层在湿润的条件下涂覆在载体上。