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81. 发明专利

JPH0231403A PLASTIC MAGNETIC CORE 失效
公开(公告)号：JPH0231403A
公开(公告)日：1990-02-01
申请号：JP18117788
申请日：1988-07-20
申请人： KOJUNDO KAGAKU KENKYUSHO KK
发明人： HOCHIDO YUKO , FUTAKI TAKEHIKO
IPC分类号： H01F1/12
摘要： PURPOSE:To reduce the eddy current loss as well as to increase the permeability of the title magnetic core by a method wherein a powder-like or short fiber-like magnetic core material of high permeability is adhered with an organic high molecular material and it is formed and solidified. CONSTITUTION:The powder-like or short fiber-like magnetic core material, having coercive force of 5 oersted or less and relative permeability of 10 or more, is formed and hardened using an organic high molecular material as a bonding and hardening agent. The powder of pure iron, silicon stainless steel, Sendust and the like is used as the powder-like or short fiber-like magnetic core material of high coercive force. The grain diameter of said powder is to be 100mum or less in short radial diameter, especially the grain diameter for high frequency is set at 1mum or less, and it is desired that the magnetic core material is in fiber-like form. Phenol resin, acryl resin propylene and the like are used as the organic molecular material. After the magnetic core powder and the above-mentioned organic high molecular material have been compounded and kneaded, it is desirable that they are vacuum-defoamed sufficiently. As a result, the eddy current loss of the magnetic core becomes very small, because the electric conductivity of the magnetic core is reduced remarkably, and the magnetic core having a large permeability even in a high frequency region can be obtained.

82. 发明专利

JPH0223602A WATER BASE MAGNETIC FLUID COMPOSITION AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH0223602A
公开(公告)日：1990-01-25
申请号：JP17349388
申请日：1988-07-12
申请人： NIPPON SEIKO KK
发明人： YABE SHUNICHI , YOKOUCHI ATSUSHI
IPC分类号： C10M159/12 , C10M173/00 , C10N10/16 , C10N20/06 , C10N30/04 , C10N40/14 , C10N70/00 , H01F1/12 , H01F1/34 , H01F1/44
摘要： PURPOSE:To maintain the excellent state of dispersion for a prolonged term by chemically bonding a coupling agent having a hydrophilic group and at least one hydrolyzable group with the surfaces of ferromagnetic substance particulates through the reaction product of the hydrolyzable group. CONSTITUTION:The surfaces of ferromagnetic substance particulates being a dispersoid have a hydroxyl group. A hydrolyzable group on one end side of the molecule of a coupling agent is, on the contrary, hydrolyzed in water and the hydroxyl group is generated. A dehydration condensation reaction is generated between the hydroxyl group formed by the hydrolysis and the hydroxyl group on the surfaces of the ferromagnetic substance particulates. Consequently, the coupling agent is chemically bonded firmly with the surfaces of particulates while hydrophilic groups at a reverse end are directed toward the outside and cover the surfaces of the particulates. Accordingly, the ferromagnetic substance particulates are dispersed into water as a dispersion medium extremely stably.

83. 发明专利

JPH01260896A LAMINATED MAGNETIC SHIELDING MATERIAL 失效
公开(公告)号：JPH01260896A
公开(公告)日：1989-10-18
申请号：JP8953688
申请日：1988-04-12
申请人： MITSUI PETROCHEMICAL IND
发明人： IGARASHI TSUTOMU , TANAKA YASUO
IPC分类号： H01L39/00 , B32B7/02 , B32B15/04 , H01F1/12 , H05K9/00
摘要： PURPOSE:To obtain a magnetic shielding material which can be manufactured readily even though the material has a large and complicated structure and can prevent leakage of magnetism, by using a laminated body of a molded body wherein superconductive ceramic powder is bonded with organic binder and a molded body wherein ferromagnetic material powder is bonded with organic binder as a magnetic shielding material. CONSTITUTION:This shielding body comprises a laminated body of a superconductive ceramic body wherein superconductive ceramic powder is bonded with organic binder and a ferromagnetic molded body wherein ferromagnetic material powder is bonded with organic binder. The superconductive ceramic powder is one kind or two or more kinds of, the powders of superconductive ceramics. As the organic binder, there is no restriction if it is obtained by bonding the particles of the superconductive powder. Especially, as a thermosetting resin, e.g., an epoxy resin using polyamine as a hardening agent is desirable. As a thermoplastic resin, a material and the like modified with unsaturated carboxylic acid of e.g., polyolefin resin or (and) maleic acid and the like are desirable. As the ferromagnetic body, arbitrary materials such as magnetic material and oxides can be used. Especially, iron, iron alloy or ferrite is desirable.

84. 发明专利

JPH01179401A MAGNETIC FLUID 失效
公开(公告)号：JPH01179401A
公开(公告)日：1989-07-17
申请号：JP67788
申请日：1988-01-07
申请人： CANON KK
发明人： KAN FUMITAKA
IPC分类号： C10M169/04 , C10M173/00 , C10N40/14 , H01F1/12 , H01F1/44
摘要： PURPOSE:To obtain the dispersion stability for grains and to substantially remove viscosity from the grains by a method wherein magnetic grains are held in a crosslinking structure consisting of a hydrophilic polymer and the like together with a liquid dispersion medium. CONSTITUTION:A magnetic granule consists of a crosslinking structural substance, a liquid dispersion medium and magnetic grains, and it has no viscosity substantially. The average grain diameter of the magnetic grains is 1-100mum. The arithmetic mean grain diameter obtained by d=SIGMAnidi/SIGMAni using an electron microscope photographing method and the like is used as the average grain diameter of the magnetic grains. Provided that it is the grain diameter of ni= grain diameter di. As the crosslinking structure, the water-soluble polymer such as guar gum, polyvinyl alcohol and the like, for example, is used as the desirable substance. As a result, the dispersion stability for the element can be obtained, and the viscosity of the magnetic granule can be removed substantially.

85. 发明专利

JPH0193103A MAGNETIC POLYMER COMPLEX AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH0193103A
公开(公告)日：1989-04-12
申请号：JP24910887
申请日：1987-10-03
申请人： INOUE MTP KK
发明人： SHINOMURA TOSHIHIKO , MARUYAMA KOJI
IPC分类号： C08J9/36 , C08K3/02 , C08K3/08 , C08K3/22 , C08L101/00 , H01F1/032 , H01F1/12
摘要： PURPOSE:To manufacture the magnetic polymer complex having excellent mechanical properties of matter and magnetic characteristics by a method wherein the polymer containing a specific quantity of magnetic powder is filled in the polymer continuously-formed holes haying a specific diameter and a void ratio. CONSTITUTION:The liquid monomer or prepolymer containing magnetic powder of 10-98wt.% is injected into the porous polymer holes, having the continuous holes of 0.05mum-10mm in diameter and also having the void ratio of 5-98vol.%, without changing the direction of orientation. When the liquid monomer or prepolymer is polymerized or crosslinked and solidified, the magnetic polymer complex having excellent mechanical properties of matter and magnetic characteristics can be manufactured.

86. 发明专利

JPH0192272A POLYMER ALLOY MAGNET AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0192272A
公开(公告)日：1989-04-11
申请号：JP24910787
申请日：1987-10-03
申请人： INOUE MTP KK
发明人： SHINOMURA TOSHIHIKO , MARUYAMA KOJI
IPC分类号： C08K3/00 , C08L101/00 , H01F1/032 , H01F1/12
摘要： PURPOSE:To obtain a polymer alloy magnet suitable as motors, sensors, etc., by melt blending a thermoplastic resin capable of forming a three-dimensional network structure of separated phases with a thermoplastic resin with magnetic powder. CONSTITUTION:A polymer alloy magnet obtained by melt blending (A) (i) 20-80 pts.wt. thermoplastic resin with (ii) 80-20pts.wt. thermoplastic resin capable of forming a three-dimensional network structure of separated phases with the component (i) [the total amount of the components (i) and (ii) is 100pts.wt.] and (B) 10-400pts.wt. magnetic powder. Furthermore, the component (ii) is preferably melt blended with the component (B) and the resultant blend is subsequently melt blended with the component (i).

87. 发明专利

JPS644002A MAGNETIC FLUID USING OIL AS LIQUID MEDIUM AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS644002A
公开(公告)日：1989-01-09
申请号：JP15929987
申请日：1987-06-25
申请人： TODA KOGYO CORP
发明人： IMAI TOMOYUKI , KUROKAWA HARUMI , MATSUI TOSHIKI
IPC分类号： C10M103/06 , C10M171/00 , C10M177/00 , C10N20/06 , C10N30/04 , C10N40/14 , C10N70/00 , H01F1/12 , H01F1/34 , H01F1/44
摘要： PURPOSE:To obtain a magnetic fluid which uses oils as a liquid medium, where a solid phase is not separated from a liquid phase and whose dispersion stability is excellent by a method wherein a nonionic surface-active agent and an anionic surface-active agent are adsorbed to the surface of fine particles of a magnetic oxide and, furthermore, a cationic surface-active agent is adsorbed. CONSTITUTION:A nonionic surface-active agent is added to a water suspension containing fine particles of a magnetic oxide; the mixture is ripened at a temperature of higher than a cloud point; the surface of the fine particles of the magnetic oxide is covered with the nonionic surface-active agent which does not display a hydrophile property because a hydrogen bond in a polyethylene oxide chain (a hydrophile part) at an anionic interface has been cut due to a heating operation and water bonded to oxygen has been removed; the water adsorbed to the surface of the particles is taken away. In succession, an anionic surface-active agent and a cationic surface-active agent are oriented and adsorbed easily and firmly to the surface of the fine particles of this magnetic oxide while a hydrophobic group has been directed to the outside. Because the fine particles of the magnetic oxide displaying a hydrophobic property are used as a raw material, they become a magnetic fluid where a solid phase is not separated from a liquid phase in a liquid medium composed of oils and whose dispersion stability is excellent.

88. 实用新型

JPS63136303U 失效
公开(公告)号：JPS63136303U
公开(公告)日：1988-09-07
申请号：JP2848987
申请日：1987-02-27
IPC分类号： C10M177/00 , B22F9/12 , C10N40/14 , C10N70/00 , F27B14/08 , H01F1/12

89. 发明专利

JPS6261660B2 失效
公开(公告)号：JPS6261660B2
公开(公告)日：1987-12-22
申请号：JP3913778
申请日：1978-04-05
申请人： TOKYO SHIBAURA ELECTRIC CO
发明人： HASEGAWA MICHIO , INOMATA KOICHIRO , SHIMANUKI SENJI
IPC分类号： C22F1/10 , C22C19/07 , C22C45/04 , C22F1/00 , H01F1/12 , H01F1/147

90. 发明专利

JPS62144305A COMPOSITE MAGNETIC MATERIAL 失效
公开(公告)号：JPS62144305A
公开(公告)日：1987-06-27
申请号：JP28444185
申请日：1985-12-19
申请人： PIONEER ELECTRONIC CORP
发明人： ONOE ATSUSHI , YOKOI HIROSHI , WATANABE ATSUSHI
IPC分类号： G11B5/133 , G11B5/127 , H01F1/12
摘要： PURPOSE:To improve reproducing characteristics and mass-productivity by connecting a metallic magnetic material, such as Sendust or the like, and oxide magnetic material, such as ferrite or the like to each other, by filling the grooves in connecting surfaces with a glass. CONSTITUTION:Mirror-polished surfaces 8 and 9 of ferrite 1 and Sendust 2, respectively, which are filled with glass 7 are made abut against each other, the glasses 7 on both surfaces are fused with each other by re-melting and the ferrite 1 and the Sendust 2 are connected to each other to form a block half 10. The other mirror-polished surfaces of the two block halves 10 are connected while track width regulating grooves 12 thereof being made coincide with each other and as part of the track width regulating grooves 15-17 to obtain a head block 18. Therefore, a composite magnetic material with little deterioration in magnetic characteristics due to gap loss can be obtained, mass- productivity is excellent because a number of processes are substituted by one process and a cost can be reduced.

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