公开(公告)号：ZA8505953B

公开(公告)日：1986-04-30

申请号：ZA8505953

申请日：1985-08-07

Applicant: BASF AG

Inventor： OHLINGER MANFRED ,  MUELLER NORBERT ,  PETER RUDOLF ,  WETTSTEIN EUGEN

IPC: H01F1/11 ,  C01G37/027 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  C01G ,  C04B ,  G11B ,  H01F

CPC classification number: C01G37/027 ,  C01P2004/10 ,  C01P2004/82 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/42 ,  G11B5/70636

公开(公告)号：CA1015149A

公开(公告)日：1977-08-09

申请号：CA140315

申请日：1972-04-21

Applicant: BASF AG

Inventor： LEUTNER BERND ,  SCHWARZMANN MATTHIAS ,  OHLINGER MANFRED

IPC: C01G37/02 ,  G11B5/706

Abstract: The invention relates to ferromagnetic chromium dioxide crystals which are particularly suitable as magnetic pigments for magnetic recording media and whose surface, for the purpose of stabilization, is protected with antimony or arsenic compounds which are sparingly soluble in water, and to a process for the production of chromium dioxide crystals thus stabilized by the precipitation of antimony or arsenic compounds which are sparingly soluble in water.

公开(公告)号：CA995889A

公开(公告)日：1976-08-31

申请号：CA140316

申请日：1972-04-21

Applicant: BASF AG

Inventor： LEUTNER BERND ,  SCHWARZMANN MATTHIAS ,  OHLINGER MANFRED

IPC: C01G37/02 ,  G11B5/706

Abstract: The invention relates to ferromagnetic chromium dioxide crystals which are particularly suitable as magnetic pigments for magnetic recording media and which are stabilized by sparingly water-soluble metal compounds whose cations form sparingly water-soluble metal chromates (such as lead hydroxide, barium phosphate, lead silicate and calcium sulfate) applied to, and particularly precipitated onto, the surface thereof, and to a process for their production.