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公开(公告)号：JPH07102194A
公开(公告)日：1995-04-18
申请号：JP24685593
申请日：1993-10-01
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , YAMASHITA KAZUTAKA , SHIRASAKI KEIJI
Abstract: PURPOSE:To provide a magnetic coating which comprises ferromagnetic fine powder containing iron as a main component, a binder and THF, thus gives a magnetic recording medium excellent in high-frequency output because the magnetic powder disperses stably and uniformly and gives excellent surface properties to the magnetic layer. CONSTITUTION:The objective coating contains (A) a ferromagnetic metal powder which mainly comprises iron having less than 0.13mum average main axis length, less than 160Angstrom crystal size, over 1850 (Oe) coercive force and more than 130(emu/g) saturation magnetization, (B) a binder such as sulfonic acid group- containing polyurethane resin or sulfonic acid group-containing vinyl chloride copolymer and (C) THF. In usual cases, the component B is added to the coating in an amount of 3 to 10 wt.%. The component C is added in an amount of 20 to 40wt.%.As the component A, is used, for example, iron powder or iron alloys with cobalt, nickel or the like.
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公开(公告)号：JPH0729149A
公开(公告)日：1995-01-31
申请号：JP17440793
申请日：1993-07-14
Applicant: KAO CORP
Inventor： SASAKI KENJI , YAMASHITA KAZUTAKA , KOBAYASHI HIDEYUKI
Abstract: PURPOSE:To obtain a magnetic recording medium having excellent magnetic characteristics and physical characteristics by a method wherein an intermediate layer containing nonmagnetic particles is formed on a substrate and a magnetic layer containing Co-coated iron oxide whose coercive force is not smaller than a specific value and whose average long axis length is not larger than a specific value is formed on the intermediate layer. CONSTITUTION:Coating material mainly composed of nonmagnetic particles and binder is applied to a substrate to form an intermediate layer. As the material of the magnetic layer of a magnetic recording medium, cobalt-coated iron oxide whose coercive force is not smaller than 1300Oe, preferably 1300-2000Oe, is employed. If the coercive force of the cobalt-coated iron oxide is smaller than 1300Oe, a high output can not be obtained. Further, the average long axis length of the cobalt-coated iron oxide is not larger than 0.3mum. Although the shape of the cobalt-coated iron oxide is not limited, a needle-shape is preferable. If the average long axis length of the cobalt-coated iron oxide is larger than 0.3mum, an S/N is degraded. On the other hand, if very fine magnetic powder whose average long axis length is not larger than 0.3mum is employed, the durability of the magnetic recording medium is degraded.
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公开(公告)号：JPH056524A
公开(公告)日：1993-01-14
申请号：JP788491
申请日：1991-01-25
Applicant: KAO CORP
Inventor： ISHIKAWA AKIRA , NAKAYAMA HIDEHIKO , YAMASHITA KAZUTAKA
IPC: G11B5/702 , C09D5/23 , C09D175/00 , C09D175/04 , C10M105/34 , C10N40/18 , G11B5/71
Abstract: PURPOSE:To obtain the medium having excellent durability and surface C/N by incorporating a specific polyurethane resin, vinyl chloride copolymer and polyisocyanate into a magnetic layer and using a specific ester compd. for a lubricant. CONSTITUTION:The polyurethane resin having a sulfonic acid metal base and the polyvinyl chloride copolymer having a sulfonic acid metal base are used as the binder of a magnetic coating material constituting the recording medium. The polyisocyanate formed by coupling an isocyanate group to an aliphat. hydrocarbon is used as a hardener. On the other hand, the ester compd. expressed by formula I is used as the lubricant. [In the formula, R1 and R2 are 1 to 25C (where the sum of the carbon atoms of R1 and R2 is 23 to 34) satd. alkyl group having a straight chain or a branch; R3 is 7 to 29C satd. or unsatd. alkyl group having a straight chain or a branch].
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公开(公告)号：JPH02199622A
公开(公告)日：1990-08-08
申请号：JP1813989
申请日：1989-01-27
Applicant: KAO CORP
Inventor： KANNEN NAOKI , YAMASHITA KAZUTAKA , YANAI HIDETOSHI
IPC: G11B5/708 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , C10M105/36 , C10N40/18
Abstract: PURPOSE:To obtain such a medium with excellent durability and little abrasion of the magnetic layer by incorporating a specific ester compd. into the magnetic layer. CONSTITUTION:The ester compd. expressed by formula I is incorporated into the magnetic layer essentially comprising magnetic powder and a binder. In formula I, R represents an aliphatic hydrocarbon group with a branched chain with 3 - 10 carbons and R' represents a satd. or unsatd. aliphatic hydrocarbon group with 7 - 21 carbons. This ester compd. is produced from a branched alcohol with 3 - 10 carbons and a monobasic fatty acid with 8 - 22 carbons, and more preferably a onobasic fatty acid with 12 - 18 carbons. This gives more preferable lubricating property and the obtd. medium has significantly improved durability in a wide range of environments.
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公开(公告)号：JPS648114B2
公开(公告)日：1989-02-13
申请号：JP8282982
申请日：1982-05-17
Applicant: KAO CORP
Inventor： NAKASONE YUMIO , TANAKA YOSHIAKI , TAKEMOTO HIROTAKA , YAMASHITA KAZUTAKA
IPC: D06M15/00 , D06M15/05 , D06M15/11 , D06M15/263 , D06M15/327 , D06M15/333 , D06M15/347
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Patent Agency Ranking
公开(公告)号：JPS61198426A
公开(公告)日：1986-09-02
申请号：JP3850685
申请日：1985-02-27
Applicant: KAO CORP
Inventor： KANNEN NAOKI , TSUSHIMA RIKIO , YAMASHITA KAZUTAKA , OKADA TOMOYUKI
IPC: G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/714
Abstract: PURPOSE:To obtain a high reproduced output and high durability by using pulverous ferromagnetic iron oxide powder having a specific surface area and a binder consisting of a polyurethane resin having SO3M groups. CONSTITUTION:The pulverous ferromagnetic iron oxide powder has /g specific surface area and the binder is the polyurethane resin having >=1 SO3M groups (where M is H, Li, Na or K) for each 1mol. The pulverous ferromagnetic iron oxide powder is enumerated by mixed crystals composed of r-Fe2O3, r-Fe2O3 and Fe3O4 or these magnetic materials deposited or doped with Co, etc. The pulverous ferromagnetic iron oxide powder having the specific surface area larger than 30m /g is relatively highly rugged in magnetic particle surface and is susceptible to damage by the friction with a magnetic head and therefore there is a problem in terms of durability. The successful dispersion of the powder into the urethane resin is not possible and eventually the high reproduced output and high durability are not obtainable. The number average mol. wt. of the polyurethane resin is preferably 5,000-50,000.
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公开(公告)号：JPS61198419A
公开(公告)日：1986-09-02
申请号：JP3850785
申请日：1985-02-27
Applicant: KAO CORP
Inventor： KANNEN NAOKI , TSUSHIMA RIKIO , YAMASHITA KAZUTAKA , OKADA TOMOYUKI
IPC: G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/708
Abstract: PURPOSE:To obtain high reproduced output and high durability with short wavelength recording by using ferromagnetic metallic powder having a specific surface area and a binder consisting of a specific polyurethane resin. CONSTITUTION:The ferromagnetic metallic powder used has /g specific surface area and the binder is the polyurethane resin having >=1 SO3M groups (where M is H, Li, Na or K) for each one molecule. The ferromagnetic metallic powder is exemplified by metallic powder such as Fe, Co and Ni or ferromagnetic alloy powder of Fe-Co, Fe-Ni, Co-Ni, Fe-Co-Ni, etc. The ferromagnetic metallic powder having >=40m /g specific surface area is relatively highly rugged in the magnetic particle surface and is susceptible to damage by the wear with a magnetic head and therefore there is a problem in the durability. In addition, the successful dispersion of the powder into the urethane resin is not possible and eventually the high reproduced output and high durability are not obtainable. The number average mol. wt. of the polyurethane resin is preferably 5,000-50,000.
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公开(公告)号：JPS61198416A
公开(公告)日：1986-09-02
申请号：JP3850385
申请日：1985-02-27
Applicant: KAO CORP
Inventor： TSUNODA YUZO , KANNEN NAOKI , TSUSHIMA RIKIO , YAMASHITA KAZUTAKA , OKADA TOMOYUKI
IPC: G11B5/702 , C09D5/23 , C09D175/00 , C09D175/04 , C09D175/06 , C09D175/12 , G11B5/714
Abstract: PURPOSE:To improve magnetic powder dispersibility, durability and surface smoothness by using a specific polyurethane resin as a binder. CONSTITUTION:The polyurethane resin having at least >=1 respectively among 3 kinds of polar groups; SO3M group, COOM group (M is H, Li, Na or K) and OH group in the molecular chain is used. A magnetic recording medium is produced by coating a magnetic paint for which the polyurethane resin is used as the binder and to which pulverous ferromagnetic powder and additive, etc. are added together with an org. solvent, on a non-magnetic substrate and drying the coating. The ratio of the binder and the pulverous ferromagnetic powder is 10-100pts.wt., more preferably 20-50pts.wt. by 100pts.wt. pulverous ferromagnetic powder. The mechanical strength and wear resistance are not enough if the ratio of the binder is below 10pts.wt. The magnetic powder density in the magnetic layer decreases and the satisfactory performance (reproduced output, etc.) as the magnetic recording medium is not obtainable if the ratio of the binder is increased to 100pts.wt. or above.
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公开(公告)号：JP2006271963A
公开(公告)日：2006-10-12
申请号：JP2006058568
申请日：2006-03-03
Inventor： UGAJIN TORU , IGAKI MICHIHITO , YAMASHITA KAZUTAKA
Abstract: PROBLEM TO BE SOLVED: To provide an instrument which may improve various kinds of physiological functions of a human body. SOLUTION: This instrument 1 for improving physiological functions of a human body etc., has an exothermic part 2 applying chemical energy to supply water vapor generated from the exothermic part 2 under a condition that a sheet is sandwiched between the exothermic part 2 and the human body surface so as to abut on each other. The instrument 1 is constructed so as to have a function to generate water vapor for more than two hours and bring the temperature of a body surface to a temperature from 38°C to lower than 42°C within one hour under a condition wherein the instrument abuts on the body surface. COPYRIGHT: (C)2007,JPO&INPIT
Abstract translation: 要解决的问题：提供可以改善人体各种生理功能的器械。 解决方案：用于改善人体生理功能的该仪器1具有放热部分2，其在片材夹在放热部分2之间的条件下施加化学能以供应由放热部分2产生的水蒸气 和人体表面相互抵接。 仪器1被构造成具有产生水蒸汽超过两小时的功能，并且在仪器的条件下在一小时内将体表温度从38℃降低到低于42℃， 靠在身体表面。 版权所有（C）2007，JPO＆INPIT
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公开(公告)号：JPH11195220A
公开(公告)日：1999-07-21
申请号：JP36078597
申请日：1997-12-26
Applicant: KAO CORP
Inventor： YAMASHITA KAZUTAKA , NAKAYAMA HIDEHIKO , TAKESHIGE YUICHI
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium having excellent travelling durability and electromagnetic conversion characteristics and suitable for high density recording. SOLUTION: This magnetic recording medium is provided with a magnetic or nonmagnetic intermediate layer 3, a magnetic layer 4 as an uppermost layer in this order on one surface of a supporting body 2 and a back coating layer 5 containing carbon black and a binder on the other surface of the body 2. the average pore diameter of narrow pores present in the back coating layer 5 is made to 1 to 10 nm and at the same time, the center line average height of the magnetic layer 4 is made to
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