Patent ID: 7361727

Claim:
In a process for forming poly(1,4-dioxan-2-one) copolymer with a cyclic ester monomer, the improvement, which comprises: (i) providing a reactant mixture consisting essentially of 1,4-dioxan-2-one and a cyclic ester monomer in an amount of 20 mole percent or less based upon the 1,4-dioxan-2-one each containing less than 100-ppm water and having an acid value less than 0.5 mg KOH/g, and an organometallic polymerization agent selected from the group consisting of a metal alkoxide and a metal alkyl into a blending means, in the absence of a solvent; and (ii) blending the reactant mixture at a temperature between about 80° and 240° C. to form the poly(1,4-dioxan-2-one) branched from the metal, wherein less than 5 wt. percent of unreacted 1,4-dioxan-2-one is present in the copolymer.