5.
    发明专利
    未知

    公开(公告)号:DE3481098D1

    公开(公告)日:1990-02-22

    申请号:DE3481098

    申请日:1984-08-24

    Applicant: IBM

    Abstract: A method for improving the durability, surface finish, and magnetic properties of a magnetic recording disk, the recording disk having a magnetic coating material with load bearing particles therein, by applying thereto a deformational force which exceeds the elastic limit of the coating material.

    PROCESS FOR COATING A SUBSTRATE WITH POLYIMIDE

    公开(公告)号:DE3461935D1

    公开(公告)日:1987-02-12

    申请号:DE3461935

    申请日:1984-02-08

    Applicant: IBM

    Abstract: A substrate is provided with a polyimide coating having good planarisation and good mechanical and thermal stability, by applying to the substrate an amino-terminated oligomer and an ester, with the oligomer being formed from an aromatic diamine and from an aromatic dianhydride, and by reacting the oligomer and the ester in situ. The ester is formed from an aromatic tetracarboxylic acid and an alcohol, and the ester is such that it reacts with an amine group of the oligomer to form a high molecular weight polyamide at a temperature between 40 DEG C and 140 DEG C, and continues to react to form a cyclic imide.

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