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    94.
    发明专利
    未知

    公开(公告)号：DE1907957A1

    公开(公告)日：1970-08-20

    申请号：DE1907957

    申请日：1969-02-18

    Applicant: BASF AG

    Inventor： HARTMANN DR HEINRICH ,  HARTMANN DR JOB-WERNER ,  WILHELM DR HANS ,  SCHNELL DR GEORG ,  KITTLER DR WOLFRAM ,  WERST DR GERHARD ,  BAUR DR REINHOLD

    IPC: C08G18/62 ,  C09D5/23 ,  G11B5/702 ,  H01F10/02

    Abstract: 1290834 Magnetic recording media BADISCHE ANILIN- & SODA-FABRIK AG 17 Feb 1970 [18 Feb 1969] 7488/70 Heading H1H In magnetic recording media comprising a non-magnetic support, e.g. tape or disc, bearing a dried or cured layer of magnetic particles dispersed in a binder, comprising a mixture of (A) a polyisocyanate (B) a OH-group-containing copolymer and (C) an organic solvent non- reactive to isocyanate groups, the polymer B is made by polymerizing, in an organic solvent, (1) 7-25 wt. per cent of an acrylic or methacrylic monoester of a C 2 -C 8 dihydric aliphatic alcohol; (2) 25-83 wt. per cent of an acrylic or methacrylic ester of a C 1 -C 8 monohydric aliphatic alcohol; (3) 10-50 wt. per cent vinylidene chloride. Up to 25 wt. per cent of further monoolefinically unsaturated monomers may be used in making the copolymer, provided that not more than 3À5% of these monomers, based on the total weight of monomers, contains groups reactive to isocyanate. The binder may be modified by addition of another copolymer of olefinically-unsaturated monomers in an amount less than B. Specified magnetic particles, are acicular or cubic γ-Fe 2 O 3 (0À1-2 Á), Fe, Co, alloys of Fe, Co, and/or Ni, chromium oxide and mixtures of iron oxides with or without other metal oxides. The proportion of magnetic particles to binder is suitably 2À4-4À5 : 1. In making the recording media, the coated and dried support may be pressed between rollers at 20-80‹ C., and tempered at 60-80‹ C. for 1-3 days. In examples, the magnetic particles are γ-Fe 2 O 3 and the binder components A and B are: (1) and (4) A-4,4 1 -diisocyanato-diphenyl methane; B - 1,4 - butanediol monoacrylate/n - butyl acrylate / acrylic acid / vinylidene chloride copolymer; (2) A-4,4 1 -diisocyanatodicyclohexylmethane; B- as (1); (3) A-4,4 1 -diisocyanato - diphenylmethane; B - 1,4 - butanediol monoacrylate / n - butyl acrylate / acrylonitrile/ vinylidene chloride copolymer. Binder (1) also contains vinyl chloride / acetate / alcohol copolymer, and binder (3) also contains vinyl chloride / diethyl maleate / dimethyl maleate copolymer.

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