High barrier breathable flash-spun sheet

A thermally bonded sheet of nonwoven flash-spun plexifilamentary fibrils addresses the balance of breathability and barrier properties in composite fabrics, enhancing surface robustness and nail tear resistance for protective apparel and construction applications.

WO2025006942A1PCT designated stage expired Publication Date: 2025-01-02DUPONT SAFETY & CONSTRUCTION INC
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Patent Information

Application Number
PCT/US2024/036098
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-30
Filing Date
2024-06-28
Publication Date
2025-01-02

AI Technical Summary

Technical Problem

Existing composite fabrics for protective apparel and construction applications face challenges in achieving a balance between breathability, barrier properties, and mechanical strength, often resulting in insufficient surface robustness and comfort due to the limitations of microporous films and spunbonded sheets.

Method used

A thermally bonded sheet of nonwoven flash-spun plexifilamentary fibrils with a specific process involving a spin fluid composition and thermal bonding method, which produces a sheet with high particle filtration efficiency, moisture vapor transmission rate, and nail tear resistance, while maintaining surface robustness and breathability.

Benefits of technology

The solution provides a robust, breathable, and chemically resistant sheet suitable for protective apparel and construction applications, offering improved surface robustness and nail tear resistance without compromising barrier properties or comfort.

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Abstract

The present invention relates to (i) a bonded sheet of nonwoven flash-spun plexifilamentary fibrils exhibiting good barrier properties, a high degree of breathability, good surface robustness and mechanical strength, including nail tear resistance, (ii) a process for the preparation of a bonded sheet of nonwoven flash-spun plexifilamentary fibrils, and (iii) a multilayer sheet structure and an article comprising the bonded sheet of nonwoven flash-spun plexifilamentary fibrils.
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Citation Information

Patent Citations

  • Improved breathable low-emissivity metallized sheets

    EP1789622B1

  • Pattern bonded nonwoven fabrics

    US20040241399A1

  • Fibrillated strand

    US3081519A

  • Nonwoven fiberous sheet of continuous strand material and the method of making same

    US3169899A

  • Process and apparatus for flash spinning of fibrillated plexifilamentary material

    US3227794A

Cited By

  • Flash-spun sheet with improved balance of barrier and gas permeability

    WO2026147594A1