Method of producing glycolic acid polymers

Leena Nurmi (Inventor), Thomas Gädda (Inventor)

Research output: PatentPatent


Described herein is a feasible, significantly simplified production method that avoids challenging lactonization steps and converts a low molecular weight aliphatic polyester, consisting of hydroxy acids and a comonomer, whose molecular weight has been increased by step-growth polymerization reactions. The molecular weight of the aliphatic polyester, based on comparison of initial and final weight average molecular weights (Mw,1/Mw,2), increased significantly at a rate which permits the use of reactive extrusion to produce high molecular weight aliphatic polyesters in a simple, economically feasible manner.

Patent family as of 25.11.2021
EP3215550 A1 20170913 EP20150857333 20151106      
EP3215550 A4 20180627 EP20150857333 20151106      
US10227446 BB 20190312 US20150521308 20151106      
US2018201724 AA 20180719 US20150521308 20151106      
WO16071574 A1 20160512 WO2015FI50768 20151106

Link to current patent family on right 

Original languageEnglish
Patent numberUS2018201724
IPCC08G 63/ 88 A I
Priority date6/11/15
Publication statusPublished - 19 Jul 2018
MoE publication typeH1 Granted patent


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