| 摘要 |
PURPOSE:To obtain a chlorine-containing aromatic polyester which is melt- moldable and can give a molding having excellent mechanical properties and optical anisotropy, by forming it from three specified structural units at a specified ratio. CONSTITUTION:A polyester which comprises structural units of formulas I, II and III and in which the units of formula I amount to 10-90mol% based on the total, the total of the units of formulas I and II amount to 90-10mol%, and the molar ratio of the units of formula II to the units of formula III is 10/0-3/7. In the formulas, X is a group of formula IV, V or the like and Y is a group of formula VI, VII, VIII or the like. The unit of formula I represents a polyester structure unit formed from 3-chloro-4-hydroxybenzoic acid. The unit of formula II represents a polyester structural unit formed from an aromatic dihydroxy compound such as hydroquinone and 4,4'-diphenyldicarboxylic acid and the unit of formula III represents a polyester structural unit formed from an aromatic dihydroxy compound such as hydroquinone and a dicarboxylic acid such as terephthalic acid.
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