C([O:4][C:5]1[CH:10]=[CH:9][C:8]([C:11]([C:14]2[CH:19]=[CH:18][C:17]([O:20]C(=O)C)=[CH:16][CH:15]=2)([CH3:13])[CH3:12])=[CH:7][CH:6]=1)(=O)C.C(O)(=O)C1C=CC=C(C(O)=O)C=1.ClCC(Cl)(Cl)Cl.C1(O)C=CC=CC=1.CC1C=CC=C(C)C=1O.C(Cl)(Cl)Cl.C(O)C.[OH-].[K+]>>[OH:4][C:5]1[CH:6]=[CH:7][C:8]([C:11]([C:14]2[CH:15]=[CH:16][C:17]([OH:20])=[CH:18][CH:19]=2)([CH3:13])[CH3:12])=[CH:9][CH:10]=1An equimolar mixture of 2,2-bis(4-acetoxyphenyl)propane (Bisphenol A diacetate) and isophthalic acid is heated gradualy to 290° C. in a stirred vessel under gradually increasing vacuum to remove the acetic acid which is liberated. When the melt viscosity of the condensate reaches a level such that stirring becomes difficult the melt is drained from the reaction vessel and crystallized. The crystallized polymer is subjected to solid state polymerization under vacuum at 280° C. until the inherent viscosity reaches 0.65 dl/g (in 40/60 by weight tetrachloroethane/phenol solution at 25° C.). The polymer is then extruded at 350° C. and pelletized. The polymer has an inherent viscosity of 0.62 and a carboxylic acid content of 40 microequivalents per gram (μeq./g), determined by potentiometric titration of a solution of the polymer in a 2,6-dimethylphenol/chloroform/ethanol mixture with an ethanolic solution of potassium hydroxide.
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