Polyester of improved colour stability

EP4608892A1Pending Publication Date: 2025-09-03FURANIX TECH BV
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Patent Information

Application Number
EP2023798390
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-10-26
Filing Date
2023-10-25
Publication Date
2025-09-03

AI Technical Summary

Technical Problem

Poly(ethylene furandicarboxylate) (PEF) tends to degrade during thermal processing, leading to discoloration due to thermal and thermo-oxidative degradation reactions, which existing methods fail to adequately address, especially in terms of maintaining color stability during melt processing and recycling.

Method used

A process involving the use of a combination of antioxidants and phosphoric acid, where the antioxidant is present during esterification and phosphoric acid is added after esterification, particularly with a germanium-containing polycondensation catalyst, to reduce color degradation during melt processing of PEF.

Benefits of technology

The process significantly reduces the increase in yellow light absorption (A_400) of PEF polymer after melt processing, maintaining color stability and achieving high molecular weight with improved optical properties.

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Abstract

Process for the preparation of a composition comprising poly(ethylene 2,5- furandicarboxylate) polymer which process comprises polycondensation of poly(ethylene 2,5- furandicarboxylate) prepolymer in the presence of both antioxidant and phosphoric acid; composition comprising poly(ethylene 2,5- furandicarboxylate) polymer, of from 5 to 5000 ppmw of antioxidant, based of weight of antioxidant on weight of total composition, and of from 2 to 2000 ppmw phosphoric acid, based on weight of phosphor on weight of total composition.
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