Patent ID: 6858701

Claim:
A wholly aromatic polyester carbonate comprising a group represented by the following formula (I): wherein A 1 is a substituted or unsubstituted aromatic group, A 2 and A 3 are the same or different and each a substituted or unsubstituted benzene ring group, and X is a group selected from the group consisting of a group represented by the following formula: wherein R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 6 carbon atoms, cycloalkyl group having 5 or 6 carbon atoms, aryl group having 6 to 12 carbon atoms or aralkyl group having 7 to 12 carbon atoms, and q is an integer of 4 to 10, with the proviso that R 3 's and R 4 's may be the same or different, and a group represented by the following formula: and a group represented by the following formula (II): wherein A 2 , A 3 and X are as defined hereinabove, as the main recurring units, the group represented by above formula (II) contained in an amount of 0.5 to 49 mol % based on the total of the group represented by the above formula (I) and the group represented by above formula (II), and having an alkali metal element content of 10 ppm or less, and having a reduced viscosity measured in a mixed solvent of phenol and 1,1,2,2-tetrachloroethane (weight ratio of 60/40) at a concentration of 1.2 g/100 ml and 35° C. of 0.5 dl/g or more.