| 摘要 |
A polyamic acid having a three-dimensional network molecular structure produced by a gel forming ring-opening polyaddition reaction in an organic solvent of the reaction components comprising: (A) an acid component consisting of at least one tetracarboxylic acid dianhydride selected from the group consisting of a tetracarboxy benzene dianhydride, a tetracarboxy dianhydride of a compound having 2 to 5 condensed benzene rings, and compounds represented by formula (III), and substituted compounds thereof: <IMAGE> (III) wherein R1 represents -O-, -CO-, -SO2-, -SO-, an alkylene group, an alkylene bicarbonyloxy group, an alkylene bioxycarbonyl group, a phenylene group, a phenylene alkylene group, or a phenylene dialkylene group, n4 is 0 or 1, n5 is 0 or 1; and n6 is 1 or 2, provided that the sum of n5 and n6 is 2, and (2) 0 to 10 wt % of at least one acid component selected from the group consisting of a di- or tricarboxylic acid, a carboxylic acid anhydride and a substituted compound thereof; (B) at least one aromatic diamine; and (C) at least one polyamino compound selected from the group consisting of compounds represented by formula (I) or (II): <IMAGE> (I) <IMAGE> (II) wherein A1 represents <IMAGE> A2 represents <IMAGE> <IMAGE> n1 is 0 or an integer from 1 to 4; n2 is 0 or an integer from 1 to 3; X represents an acid; q represents the base number of the acid; R represents -O-, -CH2-, -CO- or -SO2-; and n3 is 0 or 1; a polyimide derived from the polyamic acid; and a process for preparing a film of the polyamic acid or polyimide. The polyimide film has superior heat resistance and mechanical characteristics.
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