Patent ID: 9663616
Date: 2017-05-30
CPC Classifications: C08G

Claim:
1. A method for manufacturing poly(2-hydroxyalkanoic acid) having a Mn absolute ranging between 10000 and 250000 g/mol as determined by Gel Permeation Chromatography, the method comprising the steps of: mixing a cyclic diester of a 2-hydroxyalkanoic acid and a polymerization catalyst, polymerizing the cyclic diester to form poly(2-hydroxyalkanoic acid) in liquid phase, adding a peroxide-based compound as a catalyst deactivating agent to the liquid phase, applying a devolatilisation step to the liquid phase, adding an end-capping agent to the poly(2-hydroxyalkanoic acid) in the liquid phase, wherein the end-capping agent is an anhydride, and allowing the poly(2-hydroxyalkanoic acid) to solidify, thereby preparing a poly(2-hydroxyalkanoicacid) having a MN absolute ranging between 10000 and 250000 g/mol as determined by Gel Permeation Chromatography.