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    Production of Magnetic Recording Media
    2.
    发明专利
    Production of Magnetic Recording Media 未知

    公开(公告)号：GB1167527A

    公开(公告)日：1969-10-15

    申请号：GB5062466

    申请日：1966-11-11

    Applicant: BASF AG

    Inventor： WERST GERHARD ,  WILHELM HANS ,  BECHT GUENTER ,  UHL KARL ,  WAGNER HERBERT ,  SENKPIEL WERNER ,  SCHNELL GEORG ,  HARTMANN JOB-WERNER

    IPC: C08L77/00 ,  C09D5/23 ,  G11B5/702

    Abstract: 1,167,527. Polyamide-phenoplast compositions. BADISCHE ANILIN- & SODAFABRIK A.G. 11 Nov., 1966 [13 Nov., 1965], No. 50624/66. Heading C3R. [Also in Division H1] A binder for securing ferromagnetic particles to a substrate (see Division H1) comprises a mixture of (I) 60 to 99% by weight of a copolyamide of (a) 20 to 60% by weight of at least one lactam having more than six ring members and (b) 80 to 40% by weight of a mixture of at least one dicarboxylic acid having 6 to 20 carbon atoms, the latter mixture having at least one aliphatic dicarboxylic acid or diamine of 6 to 20 carbon atoms and represented by the formula in which Z denotes -CH 2 NH 2 or -COOH, R is an alkyl radical having at least 2 carbon atoms, R 2 is hydrogen or an alkyl radical having at least 2 carbon atoms and x and y each denote an integer from 1 to 5, and/or p,p 1 - diamino dicyclohexyl methane, the copolyamide being soluble in an organic solvent, and ((II) 40 to 1% by weight of a reaction product of formaldehyde and an aromatic compound having a phenolic hydroxy group and suitable for the formation of a phenolic resin. Numerous suitable lactams or corresponding amino acids are mentioned. Lists are given of compounds of the above general formula and of other C 6-20 dicarboxylic acids and diamines which may contain aliphatic or aromatic ring systems. The phenoplasts may be derived from phenol, cresols or naphthols and may be modified by conventional additives; in examples, the phenoplast comprises a polyester of 1 mole of trimethylol propane and 0.8 mole of adipic acid as modifier. Various solvents and optional additives are mentioned.

    MAGNETIC RECORDING MEDIA
    6.
    发明专利
    MAGNETIC RECORDING MEDIA 未知

    公开(公告)号：CA1026168A

    公开(公告)日：1978-02-14

    申请号：CA197229

    申请日：1974-04-09

    Applicant: BASF AG

    Inventor： VAETH GUENTER ,  BACHMANN RUDOLF ,  SENKPIEL WERNER ,  HARTMANN HANS-JOERG ,  FALK ROLAND ,  MOTZ HERBERT

    IPC: C09D5/23 ,  G11B5/702

    Abstract: The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

    MAGNETOGRAM LAYER CARRIER AND METHOD OF MANUFACTURING THEREOF
    8.
    发明专利
    MAGNETOGRAM LAYER CARRIER AND METHOD OF MANUFACTURING THEREOF 未知

    公开(公告)号：CS180630B2

    公开(公告)日：1978-01-31

    申请号：CS261974

    申请日：1974-04-11

    Applicant: BASF AG

    Inventor： VAETH GUENTER ,  BACHMANN RUDOLF ,  SENKPIEL WERNER ,  HARTMANN HANS-JOERG ,  FALK ROLAND ,  MOTZ HERBERT

    IPC: C09D5/23 ,  G11B5/702 ,  G11B5/62

    Abstract: The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

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