| abstract |
(57) [Summary] [Problems] 1. Excellent heat stability during melting, that is, 1. The time-dependent decrease in fluidity during melting is small, and it can be used for ordinary melt molding. Has high heat resistance, 3. 3. Excellent productivity. Provide thermoplastic polyimide with excellent dimensional accuracy. SOLUTION: The present invention has a repeating unit represented by the chemical formula (1) (Chemical formula 1), and the molecular terminal is represented by the chemical formula (2). In the polyimide composed of the chemical formula (1) and / or the chemical formula (3), the melt viscosity ratio calculated by the mathematical formula (1) [Formula 1] and / or the mathematical formula (3) [Formula 3] is represented by the formula (3). 2) The thermoplastic polyimide having good thermal stability and / or the content of the azo compound, characterized by being within the numerical range shown in [Equation 2] and / or Equation (4) [Equation 4], The amount of 1,3-bis (4) represented by the chemical formula (3) for producing polyimide is 0.0 to 0.2%. -Aminophenoxy) benzene is provided. |