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公开(公告)号：DE3438092A1
公开(公告)日：1986-04-24
申请号：DE3438092
申请日：1984-10-18
Applicant: BASF AG
Inventor： KOHL ALBERT , MELZER MILENA , LEHNER AUGUST , SCHNEIDER NORBERT , KOESTER EBERHARD DR , BALZ WERNER DR , SOMMERMANN FRIEDRICH DR , RICKER ERNST DR
IPC: G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D163/00 , C09D167/00 , C09D171/00 , C09D171/12 , C09D175/00 , C09D175/04 , C10M105/58 , C10N40/18 , G11B5/708 , G11B5/71 , B05D5/12
Abstract: In magnetic recording media consisting of a non-magnetic base and, bonded on top of this, one or more magnetizable layers based on magnetic material finely dispersed in a polymer binder, a lubricant and further conventional additives, the lubricant used is a triethanolamine esterified with oleic acid.
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公开(公告)号：DE3071255D1
公开(公告)日：1986-01-02
申请号：DE3071255
申请日：1980-12-13
Applicant: BASF AG
Inventor： REIMER KARL-JUERGEN , PFEFFERKORN DIETMAR , KOESTER EBERHARD DR , KREIMES NORBERT , ANDRIESSEN WILHELMUS , WAGNER WERNER DR , WAGNER HERBERT DR
IPC: G11B23/04 , G11B23/087
Abstract: A cassette system for any type of recording medium in strip or tape form, such as films and magnetic tapes, consists essentially of a housing whose external dimensions match those of a conventional type of cassette, and a protective holder for the recording medium which is wound into at least one roll. The housing and the holder are separate or separable members and can be fitted together. Both are provided with means for inserting the holder into the housing in the correct position, and for introducing the recording medium into the transport apparatus. The housing is provided with opening and closing means. The holder can be designed to be separable from the roll of recording medium. Preferably, the housing is a precision-made article and the holder a low-cost article.
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Patent Agency Ranking
公开(公告)号：DE3347531A1
公开(公告)日：1985-07-11
申请号：DE3347531
申请日：1983-12-30
Applicant: BASF AG
Inventor： LEHNER AUGUST , KOHL ALBERT , ROLLER HERMANN , BALZ WERNER DR , KOESTER EBERHARD DR , SOMMERMANN FRIEDRICH DR
IPC: C09D5/23 , C09D7/12 , C10M105/24 , C10M105/68 , C10N10/04 , C10N40/18 , G11B5/71 , G11B5/72 , G11B5/68 , H01F10/28 , C09D3/727 , B05D5/12
Abstract: Magnetic recording media consisting of a non-magnetic base and, applied thereto, one or more firmly adhering magnetizable layers based on magnetic material finely dispersed in a polymeric binder, at least one lubricant and other conventional additives, wherein the lubricant used is a mixture of zinc stearate which has been rendered hydrophilic and stearylamide.
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公开(公告)号：DE3224325A1
公开(公告)日：1984-01-05
申请号：DE3224325
申请日：1982-06-30
Applicant: BASF AG
Inventor： OHLINGER MANFRED DR , VAETH GUENTER , RUDOLF PETER DR , SARNECKI WILHELM DR , JAKUSCH HELMUT DR , KOESTER EBERHARD DR , MELZER MILENA
Abstract: A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280 DEG to 620 DEG C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150 DEG to 450 DEG C., to acicular ferrimagnetic iron oxide of the formula FeOx, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.
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公开(公告)号：DE3063007D1
公开(公告)日：1983-06-16
申请号：DE3063007
申请日：1980-02-07
Applicant: BASF AG
Inventor： RUDOLF PETER DR , STECK WERNER DR , KOESTER EBERHARD DR , OHLINGER MANGRED DR , JAECKH CHRISTOF DR
Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100 DEG -200 DEG C.
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公开(公告)号：DE2538792A1
公开(公告)日：1977-03-17
申请号：DE2538792
申请日：1975-09-01
Applicant: BASF AG
Inventor： SCHOENAFINGER EDUARD DR , DEIGNER PAUL DR , KOESTER EBERHARD DR , OHLINGER MANFRED DR , SCHAEFER DIETER DR , STUMPFI WERNER DR , AMORT JUERGEN DR , SEILER CLAUS-DIETRICH DR , NESTLER HEINZ DR , AMBROS OTTO DR
Abstract: Stabilisation of magnetic dioxide pigments for prepn. of magnetic registering matls. is effected by (a) suspending the pigment in an aqs. and/or alcoholic medium (b) treating the suspended pigment with a silane of formula RnSi(OR')4-n (where R is a 1-18C org. gp; R' is a 1-8C aliphatic org. gp.; and n is 1-3), or with a hydrolysis prod. of this silane, so that least partly hydrolysed silane is situated on the surface of the pigment, after the latter has been separated from the medium, and (c) drying the separated pigment at 50-200 degrees C. Retain their good magnetic properties, even under unfavourable climatic, e.g. hot and humid conditions. The pigments are also easily dispersed and worked.
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公开(公告)号：DE2242500A1
公开(公告)日：1974-03-07
申请号：DE2242500
申请日：1972-08-30
Applicant: BASF AG
Inventor： WUNSCH GERD DR , DIETER GRAW DR , DEIGNER PAUL DR , KOESTER EBERHARD DR
Abstract: Prodn. involves decompsn. of readily volatile cpds. of sub. -gp. VIII metals (I) (esp. Fe, Co and/or Ni carbonyls) to the elements on the acicular Fe oxide in a fluidised bed at >=decompsn. temp. The prodt. has good magnetic props., which can be adjusted easily by varying the amt. of (I), the prefd. amt. being 0.5-25% (I), together with 0.1-3% C. Decompsn. pref. takes place in the presence of an inert org. solvent (light petrol, b.pt. 60-140 degrees C) b.pt. =decompsn. temp. (I).
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