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91. 发明专利

JPS63253526A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63253526A
公开(公告)日：1988-10-20
申请号：JP8719687
申请日：1987-04-10
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , NAGAO MAKOTO , MORITA KAZUHIKO
IPC分类号： G11B5/702 , G11B5/64 , G11B5/73 , G11B5/738
摘要： PURPOSE:To enhance the thermal deformation resistance of a nonmagnetic base and to improve the running durability of a recording medium by providing a nonmagnetic layer formed by incorporating specific fine particles and radiation polymerizable compd. therein and polymerizing the same by projection of radiations thereon between the base and magnetic layer. CONSTITUTION:The nonmagnetic layer (under coating layer) consisting of a binder contg. the fine particle introduced from a silica sol and a compd. in which a (meth) acrylate compd. having a triazine ring occupies >=45wt.% is provided between the nonmagnetic base and the magnetic layer and this under coating layer is irradiated with the radiations. The magnetic layer is formed thereon. Such under coating layer is formed by adding the above-mentioned binder into, for example, the silica sol, coating the mixture on the base and evaporating the org. solvent in the sol. The uniform dispersion of the silica is thus attained quickly. The thermal deformation resistance of the base is enhanced by the curing of the under coating layer by the projection of the radiations to be executed thereafter. The sticking of the magnetic layers to the substrate, rolls, etc., is obviated in the case of disposing the magnetic layers on both faces. Operability is thud enhanced. The excellent running durability is thereby obtd. This medium is used not only for the thin metallic film type recording medium but for the coating type as well.

92. 发明专利

JPS6384879A POLISHING TAPE 失效
公开(公告)号：JPS6384879A
公开(公告)日：1988-04-15
申请号：JP22645986
申请日：1986-09-25
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAGUCHI NOBUTAKA , FUJIYAMA MASAAKI , SUZUKI MASAMI , YAMADA YASUYUKI
IPC分类号： B24D11/00 , G11B5/627
摘要： PURPOSE:To prevent a polished surface from flawing, by using specific vinyl chloride system resin as a binding agent so as to improve the dispersion quality of an abrasive material. CONSTITUTION:A polishing layer 2 is slided on the tape sliding surface of a magnetic head 4, which is one example of materials to be polished, and said tape sliding surface is smoothly polished by a hard abrasive material 3 protruded from a surface of the polishing layer 2. Here the polishing layer 2 contains a binding agent which contains vinyl chloride system resin having -SO3M radical (alphabet M shows Li, Na, K) and epoxy radical. This -SO3M radical provides the excellent dispersion quality, and the tape sliding surface of the magnetic head 4 can be prevented from flawing by a polishing tape in which the abrasive material is prevented from being condensed in one part while uniformly dispersed, in the polishing layer 2.

93. 发明专利

JPS62246130A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62246130A
公开(公告)日：1987-10-27
申请号：JP8951086
申请日：1986-04-18
申请人： FUJI PHOTO FILM CO LTD
发明人： OKITA TSUTOMU , HANAI KAZUKO , YAMADA YASUYUKI
IPC分类号： C08G18/08 , C09D5/23 , C09D175/00 , C09D175/06 , G11B5/702
摘要： PURPOSE:To improve the dispersibility of ferromagnetic powder and to improve an electromagnetic conversion characteristic, runnability, durability and long- term self life by having an urethane resin having specific structure as a binder component. CONSTITUTION:The component of the binder of a magnetic recording medium formed by coating and depositing a magnetic layer dispersed with the pulverized ferromagnetic powder into the binder on a nonmagnetic base contains the polyurethane resin having a plyester polyol contg. >=50mol% residual alchol group and/or >=50mol% 1 kinds of residual acid groups selected from a group B as an acid component and >=1 kinds of polyisocyanates selected from a group C as main skeleton, having >=5mol% ratio of the isocyanate component to the sum of the total alcohol component and the total acid component, and 0.03-2wt% polar group of a group D. The group A is an alicyclic dihydric alcohol, etc., the group B is an alicyclic dicarboxylic acid, etc., the group C is a tolylene diisocyanate, etc., and the group D is -SO3M, etc. Here, M is H, Na, K atoms.

94. 发明专利

JPS62243118A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62243118A
公开(公告)日：1987-10-23
申请号：JP8585986
申请日：1986-04-16
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYATSUKA HAJIME , YAMADA YASUYUKI , OKITA TSUTOMU , TSUJI NOBUO
IPC分类号： G11B5/702 , C09D5/23 , C09D175/06 , G11B5/708
摘要： PURPOSE:To obtain a binder having excellent resistance to hydrolysis and an excellent electromagnetic conversion characteristic and running durability by incorporating a specific ratio of polycaprocatone polyurethane into the binder. CONSTITUTION:The binder to be used together with pulverized CrO2 powder in the medium having a nonmagnetic base and a magnetic layer contg. the pulverized CrO2 powder dispersed in the binder on said base contains 30-90wt% polycaprocatone polyurethane. The polycaprocatone polyurethane is particularly preferably used at 40-85wt% by the total weight of the binder and the other binders which can be used in combination are preferably used at 10-70wt%, more particularly preferably at 15-60wt%. The polycaprocatone polyurethane is obtd. by condensing polyol, polyisocyanate and if necessary, chain extender. The hydrolysis of the binder is thereby extremely lessened when the medium is subjected to a high temp. and high humidity for a long period of time and therefore, the deterioration of the electromagnetic conversion characteristic and running durability is extremely lessened.

95. 发明专利

JPS62202323A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62202323A
公开(公告)日：1987-09-07
申请号：JP4381086
申请日：1986-02-28
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , INAMI HIROO , HANAI KAZUKO , YAMADA YASUYUKI
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , C09D175/06 , C10M105/34 , C10N40/18 , G11B5/708
摘要： PURPOSE:To maintain the mu value on the surface of a magnetic layer at a specified level by using a polyurethane resin into which a specific ratio of polar groups are incorporated and using a specific fatty acid ester therein. CONSTITUTION:Ferromagnetic powder, lubricating agent and polishing material are dispersed into a binder consisting of a resin component contg. the polyurethane resin having at least one kind of polar groups among -COOM, -SO3M, -OSO3M and -PO(OM')2, by which the magnetic layer is formed. The lubricating agent contains the fatty acid ester having

96. 发明专利

JPS6161175B2 失效
公开(公告)号：JPS6161175B2
公开(公告)日：1986-12-24
申请号：JP11158178
申请日：1978-09-11
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , MASUYAMA KENICHI , KITAMOTO TATSUJI
IPC分类号： C09D5/23 , G11B5/702

97. 发明专利

JPS61258330A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61258330A
公开(公告)日：1986-11-15
申请号：JP9949685
申请日：1985-05-13
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , MIYATSUKA HAJIME
IPC分类号： C09D175/04 , C09D127/06 , G11B5/73 , G11B5/735
摘要： PURPOSE:To form a magnetic recording medium which decreases output fluctua tion by incorporating a vinyl chloride resin having an -SO3M group and epoxy group as well as polyurethane into a back layer. CONSTITUTION:The back layer contains the vinyl chloride resin having the -SO3M group (M is preferably Na) and epoxy group as well as the polyurethane. The vinyl chloride resin refers to a copolymer with the other monomers polymerizable with vinyl chloride, for example, vinyl acetate. The -SO3 group and epoxy group are bound to such polymer. The preferable range of the num ber average mol.wt. of such vinyl chloride resin is 15,000-60,000 and the resin consists preferably of the compsn. composed of 80-90wt% vinyl chloride and 20-10wt%>=1 kinds of the other copolymerizable compsn. The -SO3M group is bound to the vinyl chloride resin preferably at 0.2-1.5wt% and the epoxy group is bound to the vinyl chloride resin preferably at 0.7-2.2wt%.

98. 发明专利

JPS61222027A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61222027A
公开(公告)日：1986-10-02
申请号：JP6302185
申请日：1985-03-27
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI KOJI , MASUYAMA KENICHI , YAMADA YASUYUKI , FUJIYAMA MASAAKI
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D131/04 , C09D175/04 , C09D175/08 , G11B5/714
摘要： PURPOSE:To obtain a magnetic recording medium having high reproduced output an good running durability by incorporating polycarbonate polyurethane, vinyl chloride copolymer and polyisocyanate respectively at prescribed ratios into a binder to be used at a specified ratio with specific ferromagnetic alloy powder. CONSTITUTION:The ferromagnetic alloy powder which consists of, for example, Fe, Co and Ni and has

99. 发明专利

JPS61199221A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61199221A
公开(公告)日：1986-09-03
申请号：JP4084885
申请日：1985-02-28
申请人： FUJI PHOTO FILM CO LTD
发明人： OGAWA HIROSHI , YAMADA YASUYUKI , SAITO SHINJI , TAMAI YASUO
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04
摘要： PURPOSE:To improve the electromagnetic conversion characteristic, durability, etc. of a magnetic recording medium and to decrease head wear by incorporating the addition compd. of triol and isophorone diisocyanate and the dimer or trimer of the isophorone diisocyanate into a binder component of ferromagnetic powder. CONSTITUTION:A coating type magnetic layer is formed on a nonmagnetic substrate consisting of a sheet or film of polyester, etc. or metallic foil, etc. by using the binder added with >=1 kinds among three kinds; the addition compd. of 1mol triol, for example, methylol propane and 3mol isophorone diisocyanate and the dimer and trimer of the isophorone diisocyanate together with a polyurethane resin and vinyl chloride/vinyl acetate copolymer resin as the binder for the pulverous powder of ferromagnetic metallic oxide, ferromagnetic alloy, ferromagnetic ferrite, etc. The magnetic recording medium which obviates the exfoliation, etc. of the magnetic layer, has good running property and excellent durability, S/N ratio, etc. and has a long still life is thus obtd. and the wear of a magnetic head is decreased.

100. 发明专利

JPS592228A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS592228A
公开(公告)日：1984-01-07
申请号：JP11117482
申请日：1982-06-28
申请人： Fuji Photo Film Co Ltd
发明人： YAMADA YASUYUKI , MIYOSHI TAKAHITO , OKUTSU TOSHIMITSU , FUJIYAMA MASAAKI
IPC分类号： C10M107/30 , C09D5/23 , C09D7/12 , C09D171/00 , C09D171/12 , C09D175/00 , C09D175/04 , C10N40/18 , G11B5/702 , G11B5/73 , G11B5/735
CPC分类号： G11B5/7022
摘要： PURPOSE:To improve traveling durability without increasing the coefft. of friction, by providing a coating layer wherein filler powder is kneaded and dispersed in a binder consisting of a phenoxy resin, polyol and polyisocyanate compd. on the substrate surface on the side opposite from a magnetic recording layer. CONSTITUTION:A phenoxy resin has the structure shown in the formula I , and contributes to the provision of heat resistance, toughness and blocking resistance. Polyols of polyester type and polyether types are used, and the mol. wt. thereof is 300-5,000, more preferably 600-4,000 in terms of reactivity with polyisocyanate. The filler for the back layer is inorg. powder such as SiO2, CaCO3, Al2O3, Fe2O3, TiO2, MnO, ZnO, CaO in addition to carbon black powder, graphite, tungsten disulfide, molybdenum disulfide, and boron nitride. Fatty acids of >=12 carbon atoms and ester compds. thereof, and further silicone and paraffin wax are usable as a lubricant in order to decrease the coefft. of friction of the back layer and to improve travelling property and durability.
摘要翻译：目的：提高行驶耐久性，不增加系数。通过提供涂层，其中将填料粉末捏合并分散在由苯氧基树脂，多元醇和多异氰酸酯组合物组成的粘合剂中。在与磁记录层相反的一侧的基板表面上。构成：苯氧基树脂具有式I所示的结构，有助于提供耐热性，韧性和抗粘连性。使用聚酯类型和聚醚类型的多元醇，重量。相对于多异氰酸酯的反应性为300-5,000，更优选为600-4,000。背层的填料是inorg。除了炭黑粉末，石墨，二硫化钨，二硫化钼和氮化硼之外的诸如SiO 2，CaCO 3，Al 2 O 3，Fe 2 O 3，TiO 2，MnO，ZnO，CaO的粉末。 > 12个碳原子的脂肪酸和酯类。并且可以使用另外的硅氧烷和石蜡作为润滑剂以减少该系数。的后层的摩擦力并且改善行进性能和耐久性。

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