Synthesis of novel metal-containing cured polyesters was investigated by the reaction of divalent metal salts of mono(hydroxyethyl) phthalate–bisester anhydride–monoepoxide. As the bisester anhydride, ethylene glycol bis(trimellitate) dianhydride (ETDA), diethylene glycol bis(trimellitate) dianhydride (DETDA), and polyethylene glycol bis(trimellitate) dianhydride (PETDA) were used. They were prepared from trimellitic anhydride and glycols. Phenyl glycidyl ether was the monoepoxide used. In the reactions, the Mg salt showed considerably higher catalytic activities than the Ca salt. As for the physical properties of the cured resins, heat distortion temperature, Rockwell hardness, and compressive strength decreased in the order ETDA > DETDA > PETDA. Generally, the resins containing Mg showed better physical properties than those containing Ca. Resistance to chemical attack and boiling water, thermal behavior, and electrical resistances are also discussed.
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Hideaki Matsuda (1978) studied this question.