| 摘要 |
Polyester polymers consisting essentially of repeating units having the formula <IMAGE> [I] repeating units having the formula -O-Ar1-CO-[II], repeating units having the formula -O-Ar2-O-[III], and repeating units having the formula <IMAGE> [IV] wherein Ar1 is selected from <IMAGE> <IMAGE> +TR <IMAGE> Ar2 is selected from <IMAGE> +TR <IMAGE> halogen substituted radicals of these radicals, and <IMAGE> wherein X is selected from -O-, -S-, -SO2-, -CO-, -O(CH2)nO-.-CH2)n, and <IMAGE> wherein each n independently represents a member having a value of from 1 to 10, and each R4 is independently selected from alkyl radicals of 1 to 5 carbon atoms, and R2 and R3 are independently selected from hydrogen atom, halogen radicals, alkyl radicals of 1 to 5 carbon atoms, and phenyl radical, and R2 and R3 may be identical or different from each other, and R1 is selected from halogen radicals and alkyl radicals of 1 to 5 carbon atoms, and wherein the polyester polymer has a reduced viscosity [ eta sp/c] of at least 0.2 dl/g as measured in p-chlorophenol at a concentration of 0.2 g/dl at 60 DEG C. Such polyester polymers are excellent in the mechanical strength and heat resistance and, therefore, are useful as various kinds of fibers, films, or engineering plastics. A process for preparing the polyester polymer and novel diimide-dicarboxylic acid to be used as a material in this process are also disclosed.
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