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Phenolphthalein, phenolphthalimidine, phenolisatin, and similar compounds were found to react as bisphenols with aliphatic and aromatic diacid chlorides, bischloroformates, and phosgene to form linear, high molecular weight products. Interfacial and low and high temperature solution polycondensation procedures were used. The polymers were colorless and readily formed films or fibers from a wide variety of solvents. Several peculiarities in solubility behavior were encountered. The glass transition and melting temperatures of all of the polymers were much higher than values for similar polymers derived from bisphenol A. Water absorption was relatively high, and stability to discoloration by ultraviolet light was good. The majority of the products did not crystallize readily.
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Paul W. Morgan (1964) studied this question.
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