-
公开(公告)号：DE2907255A1
公开(公告)日：1980-09-04
申请号：DE2907255
申请日：1979-02-24
Applicant: BASF AG
-
公开(公告)号：DE2916403A1
公开(公告)日：1980-11-06
申请号：DE2916403
申请日：1979-04-23
Applicant: BASF AG
Inventor： RUDOLF PETER DIPL CHEM DR , STECK WERNER DIPL CHEM DR , SARNECKI WILHELM DIPL CHEM DR , JAECKH CHRISTOF DIPL CHEM DR
IPC: C01G49/00 , C01G49/02 , C09D5/23 , C09D7/12 , G11B5/70 , G11B5/706 , H01F1/11 , H01F1/36 , G11B5/62 , H01F1/00
Abstract: A process for the manufacture of acicular magnetic iron oxides which consist of a core of gamma-iron(III) oxide and a shell of a magnetite modified with zinc(II) ions and/or manganese(II) ions and which contain, based on the total modified gamma-iron(III) oxide, from 0.1 to 20 percent by weight of iron(II) ions, from 0.1 to 10 percent by weight of zinc(II) ions and/or from 0.1 to 10 percent by weight of manganese(II) ions.
-
公开(公告)号：DE3204547A1
公开(公告)日：1983-08-18
申请号：DE3204547
申请日：1982-02-10
Applicant: BASF AG
Inventor： RUDOLF PETER DIPL CHEM DR , KOVACS JENOE DIPL CHEM DR , VAETH GUENTER , OHLINGER MANFRED DIPL CHEM DR
IPC: C01G49/00 , C01G49/06 , C09D5/23 , G11B5/62 , G11B5/706 , H01F1/11 , C01G49/02 , B05D5/12 , H01F10/20
Abstract: A modified acicular ferrimagnetic iron oxide which consists of a core of gamma-iron(III) oxide and a surrounding shell of gamma-iron(III) oxide modified by tin dioxide and carbon, and a process for its preparation.
-
-
公开(公告)号：DE3144078A1
公开(公告)日：1983-05-19
申请号：DE3144078
申请日：1981-11-06
Applicant: BASF AG
Inventor： BALZ WERNER DIPL CHEM DR , GUTERMANN WINFRIED , KOVACS JENDE DIPL CHEM DR , OHLINGER MANFRED DIPL CHEM DR , RUDOLF PETER DIPL CHEM DR
Abstract: Magnetic recording media, in particular for video recording, consisting of a nonmagnetic backing material and a magnetisable layer thereon which contains finely dispersed anisotropic magnetic material and nonmagnetic fillers in an organic polymeric binder and standard auxiliaries, and needle-shaped chromium dioxide and/or needle-shaped ferromagnetic metal particles essentially consisting of iron as an additive which limits the optical transparency of the magnetisable layer to not more than 50%.
-
Patent Agency Ranking
公开(公告)号：DE3143870A1
公开(公告)日：1983-05-11
申请号：DE3143870
申请日：1981-11-05
Applicant: BASF AG
Inventor： SARNECKI WILHELM DIPL CHEM DR , KOVACS JENOE DIPL CHEM DR , LOESER WERNER DIPL ING DR , RUDOLF PETER DIPL CHEM DR , VAETH GUENTER
Abstract: Acicular ferrimagnetic iron oxides are prepared by a process in which iron (III) oxide hydroxide consisting essentially of lepidocrocite is reduced at from 350 DEG to 600 DEG C. by means of an organic compound which is a synthetic polymer with a molecular weight of from 3,000 to 40,000 to give magnetite, which, if desired, is subsequently partially or completely oxidized with an oxygen-containing gas at from 200 DEG to 450 DEG C.
-
公开(公告)号：DE2904085A1
公开(公告)日：1980-08-14
申请号：DE2904085
申请日：1979-02-03
Applicant: BASF AG
-
公开(公告)号：DE2805621A1
公开(公告)日：1979-08-23
申请号：DE2805621
申请日：1978-02-10
Applicant: BASF AG
-
公开(公告)号：DE3116489A1
公开(公告)日：1982-11-11
申请号：DE3116489
申请日：1981-04-25
Applicant: BASF AG
Inventor： JAKUSCH HELMUT DIPL PHYS DR , LOESER WERNER DIPL ING DR , KOESTER EBERHARD DIPL PHYS DR , RUDOLF PETER DIPL CHEM DR , SENKPIEL WERNER DIPL CHEM DR , STECK WERNER DIPL CHEM DR
Abstract: A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25 DEG to 45 DEG C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50 DEG to 70 DEG C.
-
公开(公告)号：DE3044340A1
公开(公告)日：1982-06-24
申请号：DE3044340
申请日：1980-11-25
Applicant: BASF AG
-
-
-
-
-
-
-
-
-
Search Results
12
records
(took 0.021 seconds)
