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    3.
    发明专利
    未知

    公开(公告)号：DE1929171A1

    公开(公告)日：1971-01-07

    申请号：DE1929171

    申请日：1969-06-09

    Applicant: BASF AG

    Inventor： WERNER BALZ DR ,  ROLAND FALK DR ,  WERNER HARTMANN DR JOB ,  JOERG HARTMANN DR HANS ,  GEORG SCHNELL DR

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B5/72 ,  G11B5/70

    Abstract: 1306518 Magnetic composition BADISCHE ANILIN & SODA FABRIK AG 8 June 1970 [9 June 1969] 27563/70 Heading H1H A magnetic composition comprises a binder containing a magnetic pigment and from 2 to 16 parts by weight based of 100 parts by weight of the magnetic pigment of a mixture of (a) a non-magnetizable powder of an aluminium or magnesium silicate having layer structure and a plate hardness of less than 6, and (b) a non-magnetizable powder having cube-shaped to spherical particles of at least one oxide carbide or nitride of aluminium, boron, silicon or chromium, in amounts of 15 to 90% by weight of (a) and of 10 to 85% by weight of (b). One or more magnetic layers may be provided on a non-magnetic supports wherein at least one of the magnetic layers contains the above mixture. Examples disclose compositions of circular γ-iron (III) oxide with binders and (1) microtalc and fused alumina, (2) kaolinite and silicon dioxide, (3) microtalc and boron carbide, (4) as (2) and (5) kaolinite and silicon carbide, which are applied to polyethylene terephthalate film.

    5.
    发明专利
    未知

    公开(公告)号：DE1447985A1

    公开(公告)日：1969-01-09

    申请号：DE1447985

    申请日：1965-07-17

    Applicant: BASF AG

    Inventor： GEORG SCHNELL DR ,  JOB-WERNER HARTMANN DR ,  ECKHARD BONITZ DR

    IPC: C09D5/23 ,  G11B5/702 ,  G11B5/725

    Abstract: 1147518 Magnetic compositions BADISCHE ANILIN- & SODA-FABRIK A G 15 July 1966 [17 July 1965] 31867/66 Index C3R 3 R22 R32 L4H C24 C13X C10 C11 C12 C25 C6X C5B2 C8P L5A L6G L4D C14A C16 L5X A magnetic recording medium comprises a flexible non-magnetic support with a coating thereon containing magnetic particles dispersed in a thermoplastic resinous binder togehter with 0À5-26% (b. w. of the particles) of a compound of formula R n SiX 4-n , where n is 1-3, R is a saturated or unsaturated aliphatic or aromatic hydrocarbon radical, and X is a halogen atom, or alkoxy, hydroxyl, or amine radical. Numerous examples are given where R is Me, Et, Pr, Bu, Ph, naphthyl, vinyl, dodecyl, octadecyl, octyl and mixtures thereof, and X is C1, (OBu), (OEt), (OH) and (NH 2 ). The compound may be added before, during, or after dispersion of the particles. The binder may be P.V.C., cellulose ester, polyurethane, polyamide, or polyester (examples given). The magnetic particles may be acicular γ-Fe 2 O 3 , and a layer 10Á thick may be produced, containing 0À5-5% of the particles.

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