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1. 发明专利

JP2870781B2 失效
公开(公告)号：JP2870781B2
公开(公告)日：1999-03-17
申请号：JP2592189
申请日：1989-02-06
申请人： SONII KK
发明人： WATANABE HARUO , YASUDA AKIO , KAWAKADO KOICHI , TSUCHA TAKAHISA , SUZUKI SEISUKE
IPC分类号： G03G5/00 , G03G9/125 , G03G13/06 , G03G13/22 , G03G15/00 , G03G15/05 , G03G15/08 , G03G15/22

5. 发明专利

JP2940117B2 失效
公开(公告)号：JP2940117B2
公开(公告)日：1999-08-25
申请号：JP24733390
申请日：1990-09-19
申请人： SONII KK
发明人： ATA MASAFUMI , MACHIDA HORYU , WATANABE HARUO
IPC分类号： B22F1/02 , C09D5/23 , C09D7/12 , G11B5/712 , H01F1/06
摘要： PURPOSE:To manufacture ferromagnetic metal particles for magnetic recording medium having excellent oxidation resistance by treating surfaces of fine particles of the ferromagnetic metal material with 2, 3-naphthalene dicarboxylic acid or its anhydride. CONSTITUTION:The fine particles (>= about 25m /g specific surface area) of the ferromagnetic metal material (Co, Ni, etc.,) or the ferromagnetic alloy material (Fe-Co, Fe-Ni, etc.,) are dipped into the treating solution of 2, 3-naphthalene dicarboxylic acid or its anhydride dissolved in an organic solvent and 2, 3-naphthalene carboxylic acid or this anhydride is coated at about 0.03-30wt. parts to 100wt. parts of the ferromagnetic metal particles. By this method, the ferromagnetic metal particles having excellent oxidation resistance, is obtd. and by kneading this with a resin bonding agent and the organic solvent, etc., and coating on a non-magnetic supporting body, the magnetic recording medium having high quality can be manufactured.

6. 发明专利

JP2926816B2 失效
公开(公告)号：JP2926816B2
公开(公告)日：1999-07-28
申请号：JP33750989
申请日：1989-12-26
申请人： SONII KK
发明人： YASUDA AKIO , WATANABE HARUO , KAWAKADO KOICHI , SHIROKURA AKIRA , TSUCHA TAKAHISA
IPC分类号： G03G9/087 , G03G9/12 , G03G13/10

7. 发明专利

JP2903614B2 失效
公开(公告)号：JP2903614B2
公开(公告)日：1999-06-07
申请号：JP9445090
申请日：1990-04-10
申请人： SONII KK
发明人： WATANABE HARUO , KONDO HIROFUMI , KAWAKADO KOICHI , IWASAKI KAZUHARU , OKAMOTO KAZUHIRO , OOTA EIJI
IPC分类号： G11B5/712 , B22F1/02 , C09D5/23 , C09D7/12 , H01F1/06
摘要： PURPOSE:To obtain ferromagnetic metal particles having excellent weather resistance and little deterioration with passing of time by depositing dihydroxynaphthalene or its derv. on the surface of the particles. CONSTITUTION:The particles consist of fine particles of ferromagnetic metal material or ferromagnetic alloy material, covered with dihydroxynaphthalene or its derv. The ferromagnetic metal particles consist of ferromagnetic metal material Fe, Ni, Co, etc., and the ferromagnetic alloy material such as Fe-Ni alloy, Fe-Ni-Co alloy, Fe-Co alloy, Fe-Mn-Zn alloy, etc., essentially comprising Fe, Ni, and Co. Thereby, weather resistance can be improved, and oxidation reaction and deterioration of characteristics with time can be suppressed even the particles are stored at high temp. and high humidity.

8. 发明专利

JP2949768B2 失效
公开(公告)号：JP2949768B2
公开(公告)日：1999-09-20
申请号：JP10539390
申请日：1990-04-23
申请人： SONII KK
发明人： WATANABE HARUO , KONDO HIROFUMI , KAWAKADO KOICHI
IPC分类号： B22F1/02 , C09D5/23 , C09D7/12 , G11B5/712 , H01F1/06
摘要： PURPOSE:To improve oxidation resistance by depositing a compd. comprising cyclohexane as the skeleton and containing plural hydroxide groups on the surface of ferromagnetic metal particles. CONSTITUTION:The surface of ferromagnetic metal particles are covered with deposition of a compd. comprising cyclohexane as the skeleton and containing plural hydroxide groups. The ferromagnetic metal particles consist of a ferromag netic metal material such as Fe, Ni, Co, etc., or ferromagnetic alloy material essentially comprising Fe, Ni and Co, such as Fe-Ni alloy, Fe-Ni-Co alloy, etc. The compd. comprising cyclohexane as the skeleton and containing plural hydroxide groups is, for example, 1,2-dihydroxy cylohexane, 1,3-dihydroxy cyclo hexane, etc. This compd. is deposited on the surface of the ferromagnetic metal particles by a solution method, for example, that the compd. is dissolved in a solvent to prepare a solution and the ferromagnetic metal particles are dipped in this soln. Thereby, oxidation resistance of particles at high humidity is im proved and deterioration of excellent magnetic characteristics such as magnetiza tion quantity is suppressed.

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