| 摘要 |
PURPOSE:The titled copolymer having a specific repeating unit linked under a specific condition and improved melt molding properties, providing a molded article having improved balance of physical properties, obtained by co polymerizing indanediamine with a diamine having a benzene nucleus linked to a specific connecting group. CONSTITUTION:A copolymer consisting of (A) a constituent unit shown by the formula I, (B) a constituent unit shown by the formula II and (C) a constituent unit shown by the formula III (Z is trifunctional aromatic group wherein two functional group among three functional groups are bonded to neighboring carbons; R1 is 1-4C alkyl, alkoxy, or halogen; X is direct bond, -O-, -S-, -SO2-, etc.; a is 1-8; b is 0-4), wherein the amount of the units B+C is 1mol based on 1mol unit A, the amount of the unit C is 0.9-1mol based on 1-9mol of the unit B and the unit And the unit B are alternately bonded each other. For example, the polyamide-imide copolymer is obtained by reacting an aromatic tricarboxylic acid anhydride monochloride with aromatic diamines shown by the formula IV and formula V by acid chloride method.
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