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    3.
    发明专利
    未知

    公开(公告)号：SE331763B

    公开(公告)日：1971-01-11

    申请号：SE1633265

    申请日：1965-12-16

    Applicant: IBM

    Inventor： GRAHAM A ,  MITCHELL W ,  DUELTGEN R ,  SWEAZY H

    IPC: C09D5/23 ,  G11B5/702 ,  G11B5/73 ,  G11B5/842 ,  B29D17/00 ,  G11B5/68 ,  G11B5/84

    Abstract: A magnetic layer is formed by coating a mixture of polymer solution, polymerizable monomer catalyst, and magnetic material on to a mould, polymerizing the monomer, and then stripping the coating from the mould. The constituents of the mixture may be P.V.C., 1,3-butylene dimethacrylate, t-butyl perbenzoate, and acicular g -Fe2O3 resp. with 1,1,1-trichloroethan as solvent. The mixture may include plasticizers, e.g. dioctyl phthalate, and heat stabilizers, e.g. Ba-Cd Zn, for the polymer; a wetting agent for the Fe2O3, e.g. diethylene glycol monolaurate; and a thixotropic agent to prevent settling, e.g. colloidal S1O2, or carbon black. In the example, a mixture containing the Fe2O3 was thinned with a mixture containing P.V.C., the monomer being present in both, and was sprayed on to the inner surface of a cylindrical steel mould, which may initially have been coated with a silicone, e.g. dimethylpolysiloxane. A further mixture containing P.V.C., and a non-acrylic monomer, was sprayed over the first layer (to form the base). The mould was then heated at 370 DEG F. and the layers stripped from the mould.

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