Recyclable elastic filament based on a copolymer of polyamide and polyether blocks

A recyclable elastic filament using a polyamide-polyether copolymer addresses the non-recyclability of elastane by maintaining elasticity and compatibility, facilitating a straightforward recycling process that preserves performance.

FR3125543B1Active Publication Date: 2026-03-27ARKEMA FRANCE SA
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Patent Information

Application Number
FR2021008074
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-07-26
Publication Date
2026-03-27
Estimated Expiration
2041-07-26

AI Technical Summary

Technical Problem

Existing synthetic textile fibers, particularly elastane, are not recyclable due to cross-linking, which prevents heat-fusibility, and alternatives like polyesters or elastolefins lack elasticity and compatibility with polyamides, making recyclable elastic filaments with high elasticity and compatibility sought after.

Method used

Development of a recyclable elastic filament using a copolymer of polyamide and polyether blocks, specifically PA 11, PA 12, PA1010, PA 1012, PA 1014, and polytetramethylene glycol blocks, with a fusion enthalpy of 15-50 J/g, allowing for easy remelting and reuse.

Benefits of technology

The filament maintains high elasticity and compatibility with other textile fibers, enabling a simple recycling process that results in a high-performing product, with properties similar to the original after repeated remelting.

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Abstract

The invention relates to an elastic filament comprising a copolymer of polyamide blocks and polyether blocks, - the polyamide blocks being chosen from PA 11, PA 12, PA1010, PA 1012, PA 1014, their copolymer and their mixture, - the polyether blocks being blocks derived from polytetramethylene glycol with an average molecular mass by weight between 500 and 3000 g / mol, - the enthalpy of fusion of the copolymer being between 15 and 50 J / g.
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