Patent · US Active

Method of producing glycolic acid polymers

US10227446B2 · kind B2 · utility

1Cited by

11References

19Claims

0Family size

Assignee

Teknologian tutkimuskeskus VTT Oy · FI

Inventors

Leena Nurmi · Sodankylä, FI
Thomas Gädda · Helsinki, FI

Key dates

Filing date	Nov 6, 2015
Grant date	Mar 12, 2019
Priority date	—
Expiry date	Nov 6, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/912
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.