Water-releasable optical adhesive sheet

The water-peelable optical adhesive sheet, formulated with an acrylic base polymer and optimized surfactant distribution, addresses adhesion reliability and reworkability challenges at high temperatures and humidity, ensuring stable and transparent bonding for display panels.

WO2024262340A1PCT designated stage expired Publication Date: 2024-12-26NITTO DENKO CORP
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Patent Information

Application Number
PCT/JP2024/020854
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-19
Filing Date
2024-06-07
Publication Date
2024-12-26

AI Technical Summary

Technical Problem

Water-releasable optical adhesive sheets used in display panel manufacturing face challenges in maintaining adhesion reliability at high temperatures and high humidity due to uneven surfactant distribution, leading to reduced adhesive strength and water reworkability issues.

Method used

A water-peelable optical adhesive sheet with a specific adhesive strength and haze level, formulated with an acrylic base polymer and optimized surfactant distribution, ensuring reliable adhesion and easy peeling, even after 200,000 bends, and maintaining stability under high-temperature, high-humidity conditions.

Benefits of technology

The adhesive sheet achieves reliable adhesion and easy water-based peeling, ensuring stability and reworkability while maintaining transparency and optical clarity, with improved adhesive strength and reduced surfactant-related issues.

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Abstract

A water-releasable optical adhesive sheet according to the present invention has an adhesive force Fw1 of 0.5 N / 10 mm or less as measured in a prescribed water peel test, and an adhesive force Fz of 1.0 N / 10 mm or more as measured in a prescribed high-temperature, high-humidity peel test.
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Citation Information

Patent Citations

  • Optical adhesive composition and utilization thereof

    JP2020023679A

  • Pressure sensitive adhesive sheet

    JP2021024939A

  • Acrylic adhesive composition, acrylic adhesive, adhesive film, and flexible device

    WO2022224643A1