| abstract |
Disclosed is an aromatic polyester which enables to obtain a film excellent in heat resistance, hue, mechanical characteristics, dimensional stability and gas barrier properties. Specifically disclosed is an aromatic polyester containing a dicarboxylic acid component and a diol component, wherein (i) the dicarboxylic acid component contains 50-100% by mole of a repeating unit represented by the following formula (A): (A) (wherein R represents an alkylene group having 2-10 carbon atoms); (ii) the intrinsic viscosity measured at 35˚C by using a mixed solvent of P-chlorophenol/1,1,2,2-tetrachloroethane (having a weight ratio of 40/60) is 0.4-3.0; (iii) the content of a repeating unit represented by the general formula (D) below is less than 10% by mole; (D) (iv) the concentration of terminal carboxyl groups is not more than 200 eq/ton; and (v) the alkali metal content is not more than 300 ppm. Also specifically disclosed is a method for producing such an aromatic polyester. |