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    1.
    发明专利
    未知

    公开(公告)号：DE3786315D1

    公开(公告)日：1993-07-29

    申请号：DE3786315

    申请日：1987-09-19

    Applicant: BASF AG

    Inventor： MAIR GUNTHER DR

    IPC: C01G49/00 ,  C04B35/26 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11 ,  H01F1/34 ,  H01F1/36

    Abstract: Fine spherical solid particles (F1) with a dia. of 5-100 nm consists of: (A) 60-70 (wt.)% core of spherical, rhombohedral alpha-Fe2O3 with a deg. of purity of over 98% and (B) 30-40% sheath of a basic metal hydroxide-sulphate, with an alkali ion content of under 500 ppm, having general formula MvMnwZnx(OH)y(SO4)z (I) (where M = Mg, Co, Ni, Cd, Fe-II and/or Cu-II; v = 0-0.9; w = 0.1-0.9; x = 0.1-0.9; y = 1.01-1.99; z = 0.005-0.505; v + w + x = 1; 0.5 y + z = 1.) Fine, magnetic, cubic or hexagonal ferrite particles (F1' or F2') are produced by: (a) pptg. metal hydroxides from their aq. salt solns. with an aq. base on the surface of fine Fe oxide or Fe oxide-hydroxide particles in aq. dispersion, to form fine 2-layer solid particles F1 or F2 of a core (A) and sheath (B); and (b) sepg., washing, drying and sintering (green burning) F1 or F2. The aq. F1 or F2 dispersion is treated with 5-20 vol.% 1-6C alcohol, before sepn., then the particles are sped. and washed several times with a mixt. of 0.05-0.3 vol. pts. 1-6C alcohol and 1 vol. pt. water.

    5.
    发明专利
    未知

    公开(公告)号：DE3788437D1

    公开(公告)日：1994-01-20

    申请号：DE3788437

    申请日：1987-06-11

    Applicant: BASF AG

    Inventor： MAIR GUNTHER DR ,  STECK WERNER DR

    IPC: C01G53/00 ,  A61K49/18 ,  C01G49/00 ,  C01G51/00 ,  C09K9/00 ,  H01F1/36 ,  H01F1/37 ,  H01F1/44

    Abstract: Superparamagnetic solid particles of the general formula I MvMnwZnxFeyOz(I) where M is Co and/or Ni, v and w are each from 0 to 0.998, x is from 0.001 to 0.998, y is from 2.001 to 2.998, z is from 3.001 to 4, v+w+x is from 0.002 to 0.999, v+w+x+y is 3, v NOTEQUAL 0 if w=0 and w NOTEQUAL 0 or v=0, polar and nonpolar superparamagnetic liquids which contain the surfactant-coated superparamagnetic solid particles I in the form of a colloidal dispersion in polar or nonpolar liquid media, and processes for the preparation of polar and nonpolar superparamagnetic liquids.

    10.
    发明专利
    未知

    公开(公告)号：DE3619746A1

    公开(公告)日：1987-12-17

    申请号：DE3619746

    申请日：1986-06-12

    Applicant: BASF AG

    Inventor： MAIR GUNTHER DR ,  STECK WERNER DR

    IPC: C01G53/00 ,  A61K49/18 ,  C01G49/00 ,  C01G51/00 ,  C09K9/00 ,  H01F1/36 ,  H01F1/37 ,  H01F1/44 ,  C01G1/02 ,  C09C1/24 ,  C09C3/00 ,  C06D5/00

    Abstract: Superparamagnetic solid particles of the general formula I MvMnwZnxFeyOz(I) where M is Co and/or Ni, v and w are each from 0 to 0.998, x is from 0.001 to 0.998, y is from 2.001 to 2.998, z is from 3.001 to 4, v+w+x is from 0.002 to 0.999, v+w+x+y is 3, v NOTEQUAL 0 if w=0 and w NOTEQUAL 0 or v=0, polar and nonpolar superparamagnetic liquids which contain the surfactant-coated superparamagnetic solid particles I in the form of a colloidal dispersion in polar or nonpolar liquid media, and processes for the preparation of polar and nonpolar superparamagnetic liquids.

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