Solution polycondensation method

In the solution polymerization process for the preparation of linear aromatic polyesters by reacting an organic diacid halide with a hydroxyl containing component in the presence of a catalyst, the improvement which comprises adding a hydroxyl-containing component comprising a mixture of a bisphenol and a glycol, to the diacid halide wherein the diacid halide is terephthaloyl chloride, isophthaloyl chloride or a mixture thereof, and wherein the hydroxyl-containing component is 15-85 mol percent of a glycol of 2-20 carbon atoms and a bisphenol of the formula ##STR4## in which Ar is aromatic, each T is independently selected from the group consisting of halogen, G or OG, each G is independently selected from the group consisting of alkyl, aryl, haloaryl, haloalkylaryl, alkylaryl, cycloalkyl, halocycloalkyl, and haloalkyl, E is a bivalent alkylene, haloalkylene, cycloalkylene, halocycloalkylene, arylene, haloarylene, --O--, --S--, --SO--, --SO.sub.2 --, --SO.sub.3 --, --CO--, ##STR5## or GN<, m is 0 to the number of replaceable hydrogen atoms on E, each b is 0 to the number of replaceable hydrogen atoms on Ar, and d is 0 or 1.