• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This invention relates to a process for the production of ferromagnetic chromium dioxide used for the manufacture of magnetic storage media. The aim of the invention is to improve the electroacoustic properties of magnetic information carriers — the level of noise and the relative level of the echo signal. The method consists in thermally treating oxides of trivalent and hexavalent chromium in the presence of water at a temperature of 300-350 ° C and a pressure of 200-400 bar of antimony compounds and needle-like particles of iron oxides. At the same time, antimony tartrate or tartrate acid is used as antimony compounds. 2 tab.
    公开号:SU1718720A3
    申请号:SU853942402
    申请日:1985-08-08
    公开日:1992-03-07
    发明作者:Олингер Манфред；Мюллер Норберт；Петер РУДОЛЬФ；Веттстейн Ейген
    申请人:Басф Аг (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to a technology: / for producing chromium dioxide used for the manufacture of magnetic, information carriers.
    The aim of the invention is to consider the electroacoustic properties of the magnetic information carrier — the noise level and the relative level of the echo signal.
    PRI me R. 2.19 liters of water are poured into a 4 l reaction vessel. Then, with stirring, 5.68 kg of chromic anhydride is added. After 10 minutes, 33 g of tartaric acid antimony nokali salt (KSbO (SlNoOb) 0.5 HzO) (0.38% by weight relative to chromium dioxide) and 104 g of needle iron form (1.3% by weight with respect to chromium dioxide. After cessation of gas evolution, 2.84 kg of chromium oxide (W) is charged with stirring and stirred for 20 minutes, the reaction mixture is heated in an autoclave to 300-350 ° C. The pressure in the reactor is maintained at 300-400 bar. chromium dioxide with a moisture content of 1-5 wt.%. It is removed from the reactor, suspended in an aqueous solution of sodium sulfite and subjected to wet After filtration and washing, it is dried at 50 ° C in vacuum. Chromium dioxide with a specific surface of 34.2 m2 / g is obtained with a coercive force of He 51.5 kA / m, specific residual magnetic induction M y / p 39.3 pT m / g, and specific magnetization Ms // 68.9 pT m3 / g. Based on chromium dioxide, magnetic information carriers were made and the following magnetic and electroacoustic characteristics were determined: coercive force Not 52.9 kA / m, residual magnetization Mg 152 kA, maximum magnetization Mm 171 kA, low frequency adjustability At 2.5 dB, sensitive St Et -2.2 dB, high frequency controllability An 5dB, sensitivity00
    m ca o

    with
    En 3.5 dB, rest-noise voltage RQo 4 $ tfB, otmositiv ny level echo SigmM "5 $ & amp.
    In tab. 1 npeftCTWwew data on the properties of magnetic storage media made on your own chromium dioxide, obtained from r number of additives, in the table, 2 - comparative data on the electroacoustic properties of magnetic storage media, obtained by the known and proposed methods. At the same time, according to a known method, as a compound of antimony, isloshush epoxy (III) in the species of armonite.
    权利要求:
    Claims (1)
    [1]
    Claim Method The method for producing ferromagnetic chromium dioxide used to manufacture magnetic media, including heat treatment of oxides of trivalent and hexavalent chromium in the presence of water at a temperature
    300-350 ° C and a pressure of 200-400 bar in the presence of an antimony compound in an amount of 0.15-0.49 May.%, As well as in the presence of acicular particles of iron oxides in an amount of 0.5-5.0 May. % with respect to chromium dioxide, in that, in order to improve the electroacoustic properties of the magnetic information carrier — the noise level and the relative level of the echo signal — tartrate – antimony or tartaric acid salt is used as an antimony compound.
    The corresponding number “(antimony is indicated as a percentage.
    Itfpmeme 9N "neich pvrchegtvnm per cent C 52v K according to a known method. 8 rlsme on CgOs; + To-height in millimeter in Lincoln and Surya NOCALIUM SALT (CAT) based on SbjO.
    Spreadsheet
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1718720A3|1992-03-07|Method of producing ferromagnetic chromium dioxide
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    JPS6081804A|1985-05-09|Hexagonal plate type ba ferrite fine-grained powder for magnetic recording and manufacture thereof
    US3767580A|1973-10-23|Process for treating ferromagnetic chromium dioxide
    US4224175A|1980-09-23|Process for the preparation of magnetic powders based on γ-Fe2 O3
    US3190748A|1965-06-22|Preparation of oxalate magnetic particles
    KR890001971B1|1989-06-05|Process for producing cobalt-containing magnetic iron oxide powder
    JPS57205320A|1982-12-16|Formation of needlelike zinc oxide particle
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    JPS626440A|1987-01-13|Production of magnetic recording medium
    SU579898A3|1977-11-05|Method of preparing ferrous chloride
    JPS6364925A|1988-03-23|Production of hematite particle powder
    SU979333A1|1982-12-07|Process for producing acryl amide
    SU1608114A1|1990-11-23|Method of producing manganese hydrophosphate monohydrate
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    SU372178A1|1973-03-01|
    SU1003883A1|1983-03-15|Method of producing spheric carrier for ammonium oxidation catalyst
    SU1282887A1|1987-01-15|Method of producing sorbents based on cobalt hydroxide
    KR900002357A|1990-02-28|Method for producing strontium hexaferrite magnetic powder
    同族专利:
    公开号 | 公开日
    DE3575218D1|1990-02-08|
    CA1269234A|1990-05-22|
    JPS61241902A|1986-10-28|
    KR860008090A|1986-11-12|
    CN1007240B|1990-03-21|
    US4670177A|1987-06-02|
    CN85106854A|1987-02-25|
    KR930009766B1|1993-10-09|
    DE3513723A1|1986-10-23|
    EP0198110A2|1986-10-22|
    JPH0744096B2|1995-05-15|
    EP0198110B1|1990-01-03|
    AT49317T|1990-01-15|
    EP0198110A3|1988-07-06|
    SG39990G|1990-08-03|
    HK56490A|1990-08-03|
    ZA855953B|1986-04-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3034988A|1958-08-22|1962-05-15|Du Pont|Modified chromium oxide ferromagnetic compositions, their preparation and use|
    US3278263A|1964-11-27|1966-10-11|Du Pont|Ferromagnetic chromium dioxide and preparation thereof|
    US3449073A|1965-12-14|1969-06-10|Du Pont|Process for preparing chromium dioxide and product thereof|
    DE2022820C3|1970-05-11|1980-01-03|Basf Ag, 6700 Ludwigshafen|Process for the production of highly coercive chromium dioxide|
    US3778373A|1971-11-08|1973-12-11|Bell & Howell Co|Iron containing ferromagnetic chromium oxide|
    SE389220B|1972-06-30|1976-10-25|Montedison Spa|METHOD OF MANUFACTURE OF FERROMAGNETIC CHRONIOXIDE WITH FINE AND HOMOGENEOUS GRANULOMETRY WHICH WAY PROVIDES SELECTED MAGNETIC PROPERTIES|
    DE2942646A1|1979-10-22|1981-04-30|Basf Ag, 6700 Ludwigshafen|METHOD FOR PRODUCING FERROMAGNETIC CHROMDIOXIDE|
    US4524008A|1983-12-16|1985-06-18|E. I. Du Pont De Nemours And Company|Controlled initiation chromium dioxide synthesis|DE3535465A1|1985-10-04|1987-04-09|Basf Ag|METHOD FOR IMPROVING FERROMAGNETIC CHROME DIOXIDE|
    DE3536116A1|1985-10-10|1987-04-16|Basf Ag|Process for stabilising acicular ferromagnetic chromium dioxide|
    JPH0743824B2|1986-06-04|1995-05-15|日立マクセル株式会社|Magnetic recording medium and manufacturing method thereof|
    DE3718299A1|1987-05-30|1988-12-15|Basf Ag|METHOD FOR PRODUCING STABILIZED NEEDLE-SHAPED FERROMAGNETIC CHROMDIOXIDE|
    DE3941578A1|1989-12-16|1991-06-20|Basf Ag|METHOD FOR PRODUCING STABILIZED CHROME DIOXIDE AND MAGNETIC RECORDING CARRIER CONTAINING THIS MATERIAL|
    DE4339841A1|1993-11-23|1995-05-24|Basf Magnetics Gmbh|Finely divided needle-like magnetic chromium di:oxide|
    DE4412611C2|1994-04-13|2003-02-27|Emtec Magnetics Gmbh|Process for the production of finely divided ferromagnetic chromium dioxide|
    DE19714161A1|1997-04-05|1998-10-08|Emtec Magnetics Gmbh|Magnetic record carrier|
    CN102604031B|2012-03-13|2013-10-30|金坛市开瑞源光电科技有限公司|Preparation method and application of polyester polyurethane elastomer|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19853513723|DE3513723A1|1985-04-17|1985-04-17|METHOD FOR PRODUCING FERROMAGNETIC CHROMDIOXIDE|
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