laminate

The laminate with specified peelable protective films A and B addresses peeling-related damage to liquid crystal layers by ensuring controlled peeling with minimal impact, enhancing the laminate's stability and ease of handling.

WO2025205114A1PCT designated stage Publication Date: 2025-10-02FUJIFILM CORP
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Patent Information

Application Number
PCT/JP2025/010044
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-28
Filing Date
2025-03-17
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Existing laminates for liquid crystal optical elements face issues such as damage to the liquid crystal layer during peeling, including wrinkles and uneven polarization, due to the type of protective films used, and require a specified order of peeling without significant influence on the layer.

Method used

A laminate configuration with peelable protective films A and B, where protective film A has a peel strength of 1.00 N/25 mm or less, and the absolute difference in peel strength between A and B is 0.10 N/25 mm or more, with peel strength variability of 12% or less, ensuring minimal impact on the liquid crystal layer during peeling.

Benefits of technology

The laminate design allows for easy and controlled peeling of protective films in a desired order, reducing damage to the liquid crystal layer and improving handleability while maintaining stability during peeling.

✦ Generated by Eureka AI based on patent content.

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  • Figure JP2025010044_02102025_PF_FP_ABST
    Figure JP2025010044_02102025_PF_FP_ABST
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Abstract

The present invention addresses the problem of providing a laminate with which there is little effect on a liquid crystal layer when a protective film is peeled, and the protective film can be easily peeled in a desired order.　This laminate includes a peelable protective film A, a liquid crystal layer, and a peelable protective film B in the stated order, the protective film A including a base material and an adhesive layer, the adhesive layer and the liquid crystal layer being in contact with each other, the peeling force FA of the protective film A being 1.00 N / 25 mm or less, the absolute value of the difference between the peeling force FB of the protective film B and the peeling force FA being 0.10 N / 25 mm or more, and, when the protective film B is in contact with the liquid crystal layer, the variation rate VFB of the peeling force FB obtained by a predetermined method from the peeling force measured by performing a 90-degree peeling process of peeling the protective film B from the liquid crystal layer being 12% or less.
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Citation Information

Patent Citations

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  • Laminate and manufacturing method of image display panel

    JP2022129586A

  • Optical laminate

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  • Method of manufacturing polarizing plate with retardation layer

    JP2022169027A

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    WO2011052403A1