| 摘要 |
<p>The present invention provides a wholly aromatic polyester being excellent in heat resistance and toughness and being capable of being produced in an ordinary polymerization device. The present invention provides a wholly aromatic polyester which exhibits optical anisotropy when it is molten, containing the constitutional unit (I) derived from 4-hydroxybenzoic acid, the constitutional unit (II) derived from 6-hydroxy-2-naphthoic acid, the constitutional unit (III) derived from 1,4-phenylenedicarboxylic acid, the constitutional unit (IV) derived from 1,3-phenylenedicarboxylic acid and the constitutional unit (V) derived from 4,4'-dihydroxybiphenyl, containing, relative to the total of all constitutional units, the constitutional unit (I) in an amount of 35 to 75 mol%, the constitutional unit (II) in an amount of 2 to 8 mol%, the constitutional unit (III) in an amount of 4.5 to 30.5 mol%, the constitutional unit (IV) in an amount of 2 to 8 mol%, the constitutional unit (V) in an amount of 12.5 to 32.5 mol%, the total of constitutional units (II) and (IV) being in an amount of 4 to 10 mol%.</p> |
