Patent ID: 9657147
Date: 2017-05-23
CPC Classifications: C08G,C08J,Y10T

Claim:
1. A method for preparation a glycolide polyester by ring opening polymerization, comprising the steps of: a) subjecting a glycolide monomer with optional co-monomer(s) of cyclic ester(s) to ring opening polymerization in the presence of a dispersion stabilizer and a catalyst, wherein said catalyst is 1-tert-Butyl-2,2,4,4,4-pentakis(dimethylamino)-2λ selected for precipitating glycolide homopolymer or co-polymer from a solvent, said solvent being selected so that said glycolide monomer and said optional co-monomer(s), said dispersion stabilizer and said catalyst are soluble therein but the resulting glycolide homopolymer or co-polymer is non-soluble, and b) precipitation of the glycolide homopolymer or copolymer starting immediately after adding the catalyst.