-
公开(公告)号：DE2714589A1
公开(公告)日：1978-10-12
申请号：DE2714589
申请日：1977-04-01
Applicant: BASF AG
Inventor： OHLINGER MANFRED DR , STRITZINGER HEINZ DIPL ING , VAETH GUENTER , WETTSTEIN EUGEN
Abstract: Magnetic recording material, e.g. tape, is made using a substrate for a consolidated layer of fine, acicular, magnetic iron oxide dispersed in a polymer binder dissolved in an organic solvent. Oxide is mixed with 5-100% of the binder for 2-24 hrs. in a rotating vessel of the usual type employed to mix solids; and mixing is at a temp. below the softening point of the binder. The mix obtd. is then processed with the remainder of the binder, the solvent, and further addns., in a known man manner to make a dispersion applied as a thin, uniform layer, with simultaneous magnetic alignment of oxide, onto the substrate; the solvent is then evaporated to consolidate layer. Used esp. in the mfr. of magnetic recording tape. An economic process of obtaining a high packing density of oxide without impairing the magnetic properties of that oxide.
-
公开(公告)号：DE2428875A1
公开(公告)日：1976-01-02
申请号：DE2428875
申请日：1974-06-14
Applicant: BASF AG
Inventor： GRAU WERNER DR , KOPKE HELMUT , OHLINGER MANFRED DR , SCHNEEHAGE HENNING DR , SCHOENAFINGER EDUARD DR
Abstract: A process for the manufacture of acicular gamma-iron(III) oxide which, because of its improved dispersibility in organic binders, is suitable for the manufacture of magnetic recording media exhibiting a particularly high orientation ratio. For this purpose, the non-magnetic acicular alpha -iron(III) oxide or goethite pigment is treated with from 0.5 to 10% by weight, based on the pigment, of a compound of the formula I: (I) where R1, R2 and R3 are hydrogen, alkyl of 1 to 24 carbon atoms or alkenyl of 1 to 24 carbon atoms and (RX)- is selected from the group consisting of an aliphatic carboxylic acid of 1 to 18 carbon atoms, an aromatic carboxylic acid of 1 to 18 carbon atoms, a sulfonic acid and an ester of phosphoric acid and is then further processed by conventional methods to give gamma-iron(III) oxide.
-
公开(公告)号：DE3408000C2
公开(公告)日：1994-05-19
申请号：DE3408000
申请日：1984-03-03
Applicant: BASF AG
Inventor： GRAU WERNER DR , JAKUSCH HELMUT DR , KOVACS JENOE DR , OHLINGER MANFRED DR , RUDOLF PETER DR , ROLLER HERMANN
IPC: G11B5/708
-
公开(公告)号：DE3680146D1
公开(公告)日：1991-08-14
申请号：DE3680146
申请日：1986-04-22
Applicant: BASF AG
Inventor： OHLINGER MANFRED DR , VAETH GUENTER , HONECKER GERHARD
-
公开(公告)号：DE3911475A1
公开(公告)日：1990-10-11
申请号：DE3911475
申请日：1989-04-08
Applicant: BASF AG
Inventor： KOVACS JENOE DR , FESER RAINER DR , OHLINGER MANFRED DR , STEUERWALD MANFRED
Abstract: The invention relates to a blocking film, in particular hot blocking film, consisting of a carrier film and a transfer layer which can be removed therefrom and which has at least one magnetic layer of a dispersion of magnetisable particles based on chromium dioxide and/or iron oxide, and which may carry, on the side facing away from the carrier film, an adhesive layer which serves for fixing the transfer layer to a substrate.
-
Patent Agency Ranking
公开(公告)号：HK56490A
公开(公告)日：1990-08-03
申请号：HK56490
申请日：1990-07-26
Applicant: BASF AG
Inventor： OHLINGER MANFRED DR , MUELLER NORBERT DR , PETER RUDOLF DR , WETTSTEIN EUGEN
IPC: C01G37/027 , C09D5/23 , H01F1/11 , C09D7/12 , G11B5/706
Abstract: Ferromagnetic chromium dioxide is prepared by converting oxides of trivalent and hexavalent chromium under superatmospheric pressure and at elevated temperatures in the presence of water and with the addition of an antimony compound as a modifier and, if required, further additives in an amount of not more than 15% by weight, by a method in which the antimony compound is present in the form of a water-soluble salt whose anion contains one or more organic molecular moieties which are oxidized in concentrated chromic acid.
-
公开(公告)号：DE3842176A1
公开(公告)日：1990-06-21
申请号：DE3842176
申请日：1988-12-15
Applicant: BASF AG
Inventor： STEUERWALD MANFRED , OHLINGER MANFRED DR , KOVACS JENOE DR , SCHWARZ DIETER
Abstract: The invention relates to a transfer film with a magnetic layer, consisting essentially of a carrier film, a separating layer and a transfer layer detachable therefrom and formed from at least one magnetic layer, it being the case after the detachment of the carrier film the surface-forming layer on the side of the magnetic layer pointing towards the carrier film consists of a cover layer, containing inorganic pigments in a cross-linked polymer matrix, in a thickness of 0.2 to 5.0 mu m with a surface resistance of 10 to 10 ohm/cm.
-
公开(公告)号：DE3837646A1
公开(公告)日：1990-05-10
申请号：DE3837646
申请日：1988-11-05
Applicant: BASF AG
Inventor： MUELLER MICHAEL WOLFGANG DR , SCHWAB EKKEHARD DR , AUWETER HELMUT DR , FESER RAINER DR , LEHNERT RUDI DR , MUELLER NORBERT DR , OHLINGER MANFRED DR
Abstract: The invention relates to a highly coercive, acicular ferromagnetic material essentially consisting of chromium dioxide with iron, and to a process for its preparation by thermal decomposition of hydrated chromium(III) chromate under elevated pressure.
-
公开(公告)号：AT49317T
公开(公告)日：1990-01-15
申请号：AT85109558
申请日：1985-07-30
Applicant: BASF AG
Inventor： OHLINGER MANFRED DR , MUELLER NORBERT DR , PETER RUDOLF DR , WETTSTEIN EUGEN
IPC: H01F1/11 , C01G37/027 , C09D5/23 , C09D7/12 , G11B5/706
-
公开(公告)号：DE3067620D1
公开(公告)日：1984-05-30
申请号：DE3067620
申请日：1980-08-21
Applicant: BASF AG
Inventor： SARNECKI WILHELM DR , MAROSI LASZLO DR , AUTZEN HORST DR , OHLINGER MANFRED DR , STECK WERNER DR
Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by heating iron(III) oxide or iron(III) oxide hydroxide at 220 DEG -460 DEG C. under a water vapor partial pressure of not less than 30 mbar, reducing the resulting product to magnetite by means of hydrogen and/or CO and/or an organic compound which can decompose in the presence of iron oxide, and then oxidizing the magnetite with an oxygen-containing gas to give acicular ferrimagnetic iron oxide of the formula FeOX, where X is from 1.33 to 1.50.
-
-
-
-
-
-
-
-
-
Search Results
52
records
(took 0.025 seconds)
