Back to results
US 11,814,474 B2Granted
Controlled production of polyglycolic acid and glycolide
AssigneePujing Chemical Industry Co., Ltd.
InventorSaibo Wang
Life of this patent
Estimating the term…
Abstract
Provided is a process for producing a product having polyglycolic acid and glycolide from methyl glycolate. The process comprises esterification, polycondensation and optimization. Also provided are a product produced by the process and a method of changing the amount of the polyglycolic acid in the product by modifying the amount of an esterification catalyst and/or adjusting the reaction temperature.
Claims21
A process for producing polyglycolic acid and glycolide from methyl glycolate, comprising:
- (a) esterifying methyl glycolate in the presence of an esterification catalyst, whereby a melted pre-esterified polymer is formed;
- (b) polycondensing the melted pre-esterified polymer in the presence of a polycondensation catalyst, whereby polyglycolic acid based polymer is formed;
- and
- (c) an optimized reaction section optimizes the reaction of the polyglycolic acid-based polymer at an optimized temperature of 200-250° C., so as to controllably produce a polyglycolic acid and/or glycolide.
1 more element
Dependencies are inferred from the claim text.