| 摘要 |
PURPOSE:To obtain a polyimide, having specific repeating units, excellent heat resistance, processability and heat-resistant adhesive properties and suitable as base materials for space, aircraft, etc., by dehydrating a specific polyamic acid while heating, etc. CONSTITUTION:A polyimide, obtained by dehydrating a polyamic acid having repeating units expressed by formula I (R is tetrafunctional noncondensed polycyclic aromatic group having linked >=2C aliphatic, cycloaliphatic groups, etc.) and 0.1-3.0dl/g inherent viscosity (measured in N,N-dimethylacetamide solvent in 0.5g/100ml concentration at 35 deg.C), e.g. at 100-400 deg.C, or chemically imidating the polyamic acid with an imidating agent, having repeating units expressed by formula II and utilizable for multipurpose uses. Furthermore, the above-mentioned polyamic acid is prepared by polymerizing bis{4-[3-(4- aminophenoxy)benzoyl]phenyl}ether with a tetracarboxylic acid dianhydride in an organic solvent.
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