Abstract:
In production of polyesters from a Alpha , Alpha Alpha substituted- Beta -propiolactones, amides of acids of phosphorus are used as initiators for the polymerization.
Abstract:
A process for producing unsaturated polyester resins from conventionally employed unsaturated and optionally saturated dicarboxylic acids and polyhydric alcohols wherein the esterification catalyst employed is an alkali tetraphenylborate or a zirconate of 2-alkyl-1,3-hexanediol or 2,2-dialkyl-1,3hexanediol wherein the alkyl groups contain 1 to 4 carbon atoms.