Moisture absorbing / releasing member and product using said moisture absorbing / releasing member

A moisture-absorbing and releasing member with controlled permeability, dry weight, and thickness stability addresses the limitations of existing materials, enabling efficient moisture management and processability for applications like filters and dehumidifying devices.

WO2026116050A1PCT designated stage Publication Date: 2026-06-04JAPAN EXLAN CO LTD

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
JAPAN EXLAN CO LTD
Filing Date
2025-11-07
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing moisture-absorbing materials, both inorganic and organic, face issues such as hygroscopicity, morphological instability, low moisture absorption capacity, slow absorption rates, and poor processability, making them unsuitable for repeated use and efficient moisture management.

Method used

A moisture-absorbing and releasing member is created by applying a coating solution containing a hygroscopic polymer and a binder to a base paper with specific ISO permeability, ensuring the coated member has permeability below a certain threshold, maintaining dry weight and thickness stability, and allowing for controlled elongation, thereby enhancing both moisture absorption and release properties while being processable.

Benefits of technology

The solution achieves effective moisture absorption and release with improved processability, suitable for use in filters, dehumidifying devices, and water generating devices, without detaching or causing processing defects.

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Abstract

[Problem] Moisture absorbing / releasing members in which a moisture absorbing / releasing polymer is supported on a base material are used as an effective means of removing moisture from the air. In some cases, such moisture absorbing / releasing members are subjected to single-face corrugation to increase the surface area thereof and improve moisture absorbing / releasing properties. However, when such a moisture absorbing / releasing member has high air permeability, the shape of corrugation may become distorted. [Solution] A moisture absorbing / releasing member obtained by coating 30-70 g / m2 of a coating liquid that contains a moisture absorbing / releasing polymer and a binder onto a base material paper that has an ISO air permeability of 200-1000 μm / (Pa・sec), said moisture absorbing / releasing member being characterized in that the ISO air permeability after coating is less than 200 μm / (Pa・sec).
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