| 摘要 |
PURPOSE:To obtain a melt-moldable aromatic polyester excellent in heat resistance and flow, comprising three specified kinds of structural units. CONSTITUTION:This heat-resistant aromatic polyester comprises three kinds of structural units of formulas I, II and III, wherein structural units (I) amount to 55-80mol% based on the total, structural units [II+III] amount to 45-20mol% based on the total and the molar ratio of structural units (II) to structural units (III) is 1-5. In formulas I-III, X is at least one group selected from among groups of formulas IV and V, etc., and Y is at least one group selected from among groups of formulas VI and VII, etc., provided that the case where Y is a group of formula VI when X is at least one group selected from groups of formulas IV and V is excluded. Said polyester can be produced by, for example, subjecting an aromatic dihydroxy compound such as p- hydroxybenzoic acid or t-butylhydroquinone, a dicarboxylic acid such as terephthalic acid and acetic anhydride to a polycondensation reaction by elimination of acetic acid.
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