Foamed polyester of a cyclic diacid anhydride with an epoxide
 The invention provides a process for the production of a foamed polyester which comprises initiating a reaction between a poly-terminal epoxide, a mono-terminal epoxide and a cyclic diacid anhydride in the presence of a catalytically effective quaternary salt and a blowing agent, 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. PAC BACKGROUND OF THE INVENTION 
Monsanto Company
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James C. Walter R.
Hill Knox