| 摘要 |
High molecular weight thermotropic copolyesters and copolyesteramides which can be molded/extruded into a wide variety of useful shaped articles having improved thermomechanical properties are comprised of recurring structural units of the formulae (I), (II), (III) and (IV), wherein <IMAGE> <IMAGE> (III) represents the structure: +TR <IMAGE> <IMAGE> in which the symbol A is an oxygen atom or the NH group; the molar ratio of the units (I) relative to the sum of the units (II)+(III) ranges from 0.95 to 1.05; the amount of the units (II) in the mixture of (II)+(III) ranges from 20 to 90 mol % and that of the units (III), on the same basis, ranges from 80 to 10 mol %; the amount of the units (IV), expressed relative to the amount of the units (I), ranges from 25 to 300 mol %; and said copolyesters and copolyesteramides have a flow temperature ranging from 200 DEG to 350 DEG C.
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