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    MAGNETIC RECORDING CARRIER
    1.
    发明专利
    MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH0386917A

    公开(公告)日：1991-04-11

    申请号：JP21913790

    申请日：1990-08-22

    Applicant: BASF AG

    Inventor： MANFUREETO OORINGAA ,  IEENE KOFUAKUSU

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/706

    Abstract: PURPOSE: To make it possible to assure a high-quality image and voice quality with respect to blocking and head wear at the time of tape/head contact by composing a magnetic recording carrier of a nonmagnetic carrier material and a magnetizable specific layer applied thereon. CONSTITUTION: This magnetic recording carrier is composed of the nonmagnetic carrier material and the magnetizable material which is applied thereon and intrinsically consists of a magnetic material selected from a group consisting of iron oxide (III) reformed with cobalt and hexagonal ferrite finely dispersed into an org. binder and an inorg. supplying material. Acicular ferromagnetic chromium dioxide having intensity of a coercive magnetic field of over 24kA/m and a specific surface area of 20 to 60m /g is incorporated as the inorg. supplying material at a ratio of 10 to 20% of the magnetic material into the magnetized layer. As a result, the magnet layer is highly homogeneous and smooth and the blocking does not arise at the time of a recording carrier operation. The use of the finely dispersed iron oxide (III) reformed with the cobalt is made usable and the degradation in quality or layer homogeneity does not arise any more.

    MAGNETIC RECORDING CARRIER
    4.
    发明专利
    MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH01102729A

    公开(公告)日：1989-04-20

    申请号：JP22892188

    申请日：1988-09-14

    Applicant: BASF AG

    Inventor： IEENE KOFUAKUSU ,  MIRENA MERUTSUAA ,  BUERUNAA BARUTSU ,  BUERUNAA RENTSU ,  BUERUNAA ROTSUHO ,  HERUMUUTO YAKUSHIYU

    IPC: G11B5/706 ,  C09D5/23 ,  C09D7/12 ,  C09D167/00 ,  C09D177/00 ,  C09D183/04 ,  G11B5/70 ,  G11B5/702 ,  G11B5/708 ,  G11B5/71

    Abstract: PURPOSE: To improve S/N and durability by incorporating specific particulate nonmagnetic metal oxides, lubricants and a comb-shaped block copolymer as a dispersant at restricted ratios into particulate magnetic materials having a specified specific surface area. CONSTITUTION: This magnetic recording carrier contains at least one kind of the particulate nomnagnetic metal oxides having Mohs hardness larger than 5 and the specific surface area based on BET of at least 2m /g at a ratio of 1 to 20wt.% of the weight of at least one kind of particulate magnetic materials having the specific surface area based on BET of at least 25m /g, at least one kind of the lubricants selected from a group consisting of silicone resins, polyethylene wax and metal salts of paraffin, etc., at a ratio of 1 to 10wt.% and the comb-shaped block copolymer consisting of a polyethylene imine chain having a mol.wt. of at least 2000 as a base and having a polyamide and/or polyester side chain having a mol.wt. of at least 500 at a ratio of 1 to 20wt.%. As a result, the S/N and the resistivity to the wear of the layer surface are improved.

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