专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

71. 发明专利

JPS6087426A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6087426A
公开(公告)日：1985-05-17
申请号：JP19582483
申请日：1983-10-19
申请人： FUJI PHOTO FILM CO LTD
发明人： SAITOU SHINJI , OGAWA HIROSHI , KASUGA AKIRA , OOYA TAKAO , TAMAI YASUO
IPC分类号： C08K5/00 , C08K5/20 , C08L1/00 , C08L23/00 , C08L27/00 , C08L33/00 , C08L33/02 , C08L101/00 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , C10M105/68 , C10N40/18 , G11B5/702
摘要： PURPOSE:To obtain a magnetic tape having excellent running property and durability by incorporating dialkanol amide of fatty acid into a magnetic layer. CONSTITUTION:The dialkanol amide of fatty acid having the constitutional formula expressed by the general formula ( I ) is incorporated into a magnetic layer consisting of ferromagnetic powder. Here R1 denotes an alkyl group, alkenyl group, alkinyl group and R2, R3 denote an alkylene group. The amt. of the dialkanol amide of fatty acid of this invention is preferably 0.5-4wt%, more preferably 1-3wt% based on the weight of the ferromagnetic powder. If the amt. of =4wt%, the adhesion to a head arises and is undesirable.

72. 发明专利

JPS58100402A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS58100402A
公开(公告)日：1983-06-15
申请号：JP19911081
申请日：1981-12-10
申请人： FUJI PHOTO FILM CO LTD
发明人： MATSUFUJI AKIHIRO , UMEMURA SHIZUO , KASUGA AKIRA , MIYATSUKA HAJIME , AKASHI GOROU
IPC分类号： B22F9/22 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/06
摘要： PURPOSE:To obtain a magnetic recording medium with improved dispersibility and good weatherproof property by using ferromagnetic metal powder which is obtained such that needle-like iron oxide powder is first heat-treated in non- reduced or reduced gas, washed again with water and then reduced by heating. CONSTITUTION:Needle-like alpha-FeOOH containing Ni 5% fully washed with well water is heated at 500 deg.C for 2hr in air so as to obtain powder of alpha-Fe2O3. This powder is washed with distilled water until conductivity of the filtrate shows no change, and then reduced at 380 deg.C for 6hr in the stream of H2 to obtain powder of alpha-Fe containing Ni. After dipping the powder thus obtained in toluene, the toluene is removed at 40 deg.C in air and a magnetic coating solution is prepared using metal powder. The prepared solution is coated on a polyester film and undergoes magnetic field orientation. After drying it is subject to surface treatment and then cut with a given width to obtain a magnetic tape.

73. 发明专利

JPS58100B2 失效
公开(公告)号：JPS58100B2
公开(公告)日：1983-01-05
申请号：JP4401775
申请日：1975-04-11
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA , AKASHI GORO , SUZUKI OSAMU
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , G11B5/716 , H01F1/11

74. 发明专利

JPS57150130A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS57150130A
公开(公告)日：1982-09-16
申请号：JP3583281
申请日：1981-03-12
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA , HIBINO NOBUROU , MIYATSUKA HAJIME
IPC分类号： C08L67/02 , C08L69/00 , G11B5/73 , G11B5/735
摘要： PURPOSE:To lower noises of a magnetic recording medium, to increase the S/N ratio and to make a titled medium suitable for video, by increasing the surface roughness at the magnetic layer of a nonmagnetic support than that of the back side. CONSTITUTION:On a nonmagnetic support 1 such as a polyethylene terephthalate film and a polycarbonate film, a magnetic layer 2 consisting essentially of magnetic powder 21 (e.g., gamma-Fe2O3, Fe3O4) and a binder 22 (e.g., vinyl chloride-vinyl acetate copolymer) is provided to manufacture a magnetic recording medium. In this case, the surface of magnetic layer side (hereinafter A side) of the base 1 is roughened more than that of the back side surface (hereinafter B side) of the support 1 to obtain an objective magnetic recording medium. Preferably, the surface roughness of the side A is set to >=0.07 and that of the side B is set to

75. 发明专利

JPS57143732A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS57143732A
公开(公告)日：1982-09-06
申请号：JP2954981
申请日：1981-03-02
申请人： FUJI PHOTO FILM CO LTD
发明人： MIZUNO CHIAKI , TAMAI YASUO , KASUGA AKIRA
IPC分类号： C09D5/23 , G11B5/702
摘要： PURPOSE:To prevent squeak of a tape when a tape is running, by providing a magnetic recording layer mainly consisting of ferromagnetic fine powder and a binder, on a nonmagnetic flexible supporting body. CONSTITUTION:A magnetic painting material is obtained by mixing 100pts.wt. ferromagnetic fine powder with 10-100pts.wt. mixture a vinyl chloride-vinyl acetate-vinyl alcohol copolymer of 180-1,200 polymerization degree, consisting of 78-98wt% vinyl chloride, 0.1-15wt% vinyl acetate and 1-10wt% vinyl alcohol, and a vinyl chloride-vinylidene chloride copolymer of 200-1,000 polymerization degree, in the weight ratio of 25:75-75:25, as a binder, a polishing agent, a lubricating agent, etc. Subsequently, said magnetic painting material is applied onto a nonmagnetic flexible supporting body whose thickness is 3-37mu, and a magnetic recording layer is formed. In this way, when a tape is made to run under the condition of high temperature and high humidity, it is possible to prevent a drop of a recording and reproducing level due to the fact that a chip and chip powder of the magnetic layer adheres onto the magnetic head.

76. 发明专利

JPS57135428A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS57135428A
公开(公告)日：1982-08-21
申请号：JP1990481
申请日：1981-02-13
申请人： FUJI PHOTO FILM CO LTD
发明人： MATSUFUJI AKIHIRO , KASUGA AKIRA , MIYATSUKA HAJIME
IPC分类号： C09D5/23 , G11B5/702
摘要： PURPOSE:To improve a dispersion property, a running property, durability, etc., by using a binder consisting of specific components as a binder of a magnetic layer using ferromagnetic metallic powder. CONSTITUTION:A magnetic layer obtained by dispersing ferromagnetic mtallic powder in a binder component consisting of (a) nitrocellulose and its derivative, (b) polyurethane resin such as polyester polyurethane, polyther polyurethane, etc., and also (c) a polyisocyanate compound as required is provided on a supporting body.

77. 发明专利

JPS5744225A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS5744225A
公开(公告)日：1982-03-12
申请号：JP11949180
申请日：1980-08-29
申请人： Fuji Photo Film Co Ltd
发明人： MIYATSUKA HAJIME , KASUGA AKIRA , YAMADA YASUYUKI
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12 , G11B5/702 , G11B5/712
CPC分类号： G11B5/7023
摘要： PURPOSE:To obtain a magnetic recording medium which excels in the magnetic properties, the video properties and the aging stability, by adding a polymer of
摘要翻译：目的：通过加入具有极性官能团<100聚合度的聚合物形成磁性层，得到磁特性，视频性能和老化稳定性优异的磁记录介质。构成：将约1-30mol羧基，羟基，磺酸基等加入到分子中，聚合物（如丙烯酸酯和丙烯酸的低分子量共聚物）= 100平均聚合度用来。换句话说，将铁磁性材料粉末（例如Fe（合金）粉末）浸入上述聚合物溶液中，然后干燥，并将约0.1-10wt％的聚合物粘附在铁磁性材料粉末上。之后，将经处理的铁磁材料粉末，粘合剂（例如具有约<= 150℃浸渍温度和约100-1000度聚合度的丙烯酸酯 - 丙烯腈共聚物），溶剂和其它添加剂混合，得到磁性跳动将这种涂料施用在支撑物上，然后干燥。

78. 发明专利

JPS5446011A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS5446011A
公开(公告)日：1979-04-11
申请号：JP11240077
申请日：1977-09-19
申请人： FUJI PHOTO FILM CO LTD
发明人： OGAWA HIROSHI , TAMAI YASUO , KASUGA AKIRA
IPC分类号： G11B5/708 , C09D5/23 , G11B5/70
摘要： PURPOSE:To smooth surface, increase square ratio, improve running characterristic and improve recording-reprodcing characteristics of high frequency range signals by using a specific binder in the magnetic layer of audio cassette tape. CONSTITUTION:Vinly chloride-vinly acetate copolymer of preferably 300 to 500 in degree of polymerization is hydrolyzed of parr of its vinly acetate so as to be contained with 10 to 20 (preferably 10 to 15) wt% of vinyl alcohol units. This vinyl chloride-vinyl acetate-vinyl alcohol copolymer and polyether-polyurethane prepolymer containing preferably 4 ot 10wt% of NCO groups its molecular terminal are mixed in a range of 70/30 to 50/50 in weight ratio and preferably 15 to 30pts.wt. of this mixture is used with 100ps.wt. of ferromagnetic fine powder. The magnetic coating prepared by dispersing such binder and ferromagnetic powder is coated on a non-magnetic backing and is then dried.

79. 发明专利

JP2003036515A Magnetic recording medium 审中-公开
标题翻译：磁记录介质
公开(公告)号：JP2003036515A
公开(公告)日：2003-02-07
申请号：JP2001221651
申请日：2001-07-23
申请人： Fuji Photo Film Co Ltd , 富士写真フイルム株式会社
发明人： KASUGA AKIRA
IPC分类号： G11B5/70
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium which can make high density recording and is used as a computer data recording magnetic tape suitable to a magnetic recording/reproducing system. SOLUTION: This magnetic recording medium has a magnetic layer containing ferromagnetic powder and a binder on one surface of a base. This magnetic layer has projections 20 nm high or higher but 50 nm high or lower on the surface, and the number of those projections is 200/900 μm or more but 150/900 μm .
摘要翻译：要解决的问题：提供一种可以进行高密度记录的磁记录介质，并用作适用于磁记录/再现系统的计算机数据记录磁带。解决方案：该磁记录介质在基底的一个表面上具有含有铁磁粉末和粘合剂的磁性层。该磁性层的表面具有高达20nm以上但高达50nm以上的突起，并且这些突起的数量为200 /900μm2以上且150 /900μm2。

80. 发明专利

JP2001043525A MAGNETIC RECORDING TAPE 失效
公开(公告)号：JP2001043525A
公开(公告)日：2001-02-16
申请号：JP21537199
申请日：1999-07-29
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA , SUEKI MINORU
IPC分类号： G11B5/718 , G11B5/735 , G11B5/78
摘要： PROBLEM TO BE SOLVED: To provide a magnetic tape suitable for a magnetic recording/ reproducing system which utilizes a linear recording system and has a magneto- resistive reproducing head incorporated in the system. SOLUTION: This magnetic tape has an information-recording magnetic layer containing ferromagnetic fine power and a binder, having a >=0.05 μm and

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式