Sherman and Shalloway
Aromatic copolyester derived from aromatic dicarboxylic acid component and aromatic diol component
 An aromatic copolyester comprising substantially equimolar proportions of [A] units derived from an aromatic dicarboxylic acid having 8 to 16 carbon atoms, and [B] units derived from an aromatic diol component; characterized in that PA0 (I) the diol component [B] is composed of 20 to 95 mole %, based on the total moles of compounds (a) and (b) below, of PA1 (a) a bisphenol compound represented by the formula ##STR1## wherein X represents a direct bond, or a divalent group selected from the class consisting of C.sub.1 -C.sub.8 alkylidene groups, O, S, SO, SO.sub.2 and CO, and PA1 (b) 5 to 80 mole %, based on the total moles of the compounds (a) and (b), of a compound selected from the group consisting of a specific divalent phenolic compound, and PA0 (II) the aromatic copolyester has an intrinsic viscosity [.eta.], determined at 60.degree. C. in pentafluorophenol, of at least 0.4 dl/g. 
Mitsui Petrochemical Industries, Ltd.
C
C08G
inventional
Takayuki Tadao Toshiki
Nakano Yatsu Sotoyama