SOLUBLE THERMOPLASTIC POLYESTERIMIDES

Different methods were tested to synthesize thermoplastic polyesterimi des on the basis of 2,2-bis-[4-(3,4-dicarboxyphenoxy)phenyl]propane di anhydride and aromatic diamines. These were two-stage methods involvin g the preparation of polyamidoacid by interfacial polycondensation or in solution and subsequent thermal solid-phase imidization, and one-st age synthetic procedures conducted in high-boiling organic solvents. F usible samples of the polymers with good rheological characteristics w ere obtained in a mixed solution of N-methylpyrrolidone and toluene, w here MM of the polymers was regulated by adding a 3 - 5 mol % excess o f the dianhydride component.