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    1.
    发明专利
    未知

    公开(公告)号：DE2945139A1

    公开(公告)日：1980-05-14

    申请号：DE2945139

    申请日：1979-11-08

    Applicant: UBE INDUSTRIES

    Inventor： SASAKI YOSHIKAZU ,  INOUE HIROSHI ,  SASAKI ICHIRO ,  ITATANI HIROSHI ,  KASHIMA MIKITO

    IPC: C08G73/10

    Abstract: A polyimide solution is prepared by a process wherein a tetracarboxylic acid ingredient containing at least about 80% by mole of 3,3',4,4'-biphenyltetracarboxylic acid or its functional derivative and an aromatic diamine ingredient containing at least about 50% by mole of 4,4'-diaminodiphenyl ether are polymerized at from about 100 DEG to 300 DEG C. in phenol or a halogenated phenolic compound; the amount of the acid and diamine ingredients being approximately equimolar to each other; whereby polymerization of the tetracarboxylic acid ingredient and the aromatic diamine ingredient is effected while being accompanied by imidation. Preferably, the polymerization accompanied by imidation is effected in a manner such that at least a second half of the polymerization is carried out in a closed reaction system. The resulting polyimide solution is suitable for making therefrom shaped articles, such as films, possessing excellent mechanical properties.

    2.
    发明专利
    未知

    公开(公告)号：DE2932589A1

    公开(公告)日：1980-02-28

    申请号：DE2932589

    申请日：1979-08-10

    Applicant: UBE INDUSTRIES

    Inventor： SASAKI ICHIRO ,  ITATANI HIROSHI ,  KASHIMA MIKITO ,  YOSHIMOTO HATAAKI ,  YAMAMOTO SHUJI ,  SASAKI YOSHIKAZU

    IPC: C08J3/09 ,  C08L79/08 ,  C09D3/49 ,  C09J3/16

    Abstract: An aromatic polyimide resin composition useful for producing a film or sheet, comprises 2% by weight or more of an imide polymer having at least 90 molar % of a recurring unit of the formula (I): (I) wherein R' is a divalent aromatic radical, and dissolved in an organic polar solvent consisting essentially of one or more halogenated phenol compounds of the formulae (II) or (III): (II) and (III) wherein R2 is a hydrogen atom of a C1-3 alkyl radical and is a halogen atom, the halogenated phenol compound having a melting point of 100 DEG C. or less and a boiling point of 300 DEG C. or less.

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