Polyester of a cyclic diacid anhydride with an epoxide
 The invention provides a process for the production of a polyester which comprises initiating a reaction between a polyterminal epoxide being the reaction product of one mole bisphenol A and two moles of epichlorohydrin, a mono-terminal epoxide and a cyclic diacid anhydride in the presence of a catalytically effective quaternary salt heating to a point at which the reaction becomes a self-sustaining exothermic reaction and controlling the reaction such that the temperature of the mixture is not reduced until after the exothermic reaction has begun to subside. 
Monsanto Company
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Walter R. James C.
Knox Hill