Adhesive sheet, repeatedly flexed laminated member, and repeatedly flexed device

An adhesive with a high creep recovery rate addresses lifting and peeling issues in repeatedly flexible displays by maintaining bond integrity and restoring shape after bending, enhancing the durability of flexible displays and laminated members.

JP7875721B2Inactive Publication Date: 2026-06-18LINTEC CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
LINTEC CORP
Filing Date
2022-05-02
Publication Date
2026-06-18
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

⚠Technical Problem

Conventional adhesive sheets used in repeatedly flexible displays suffer from lifting and peeling at the interface between the adhesive layer and the adherend, and may cause deformation leading to a permanent flexed state.

⚗Method used

An adhesive with a creep recovery rate of 70% or more, characterized by specific creep compliance values, is used to bond flexible members, preventing lifting and peeling, and allowing restoration to the original shape after being released from a bent state.

🎯Benefits of technology

The adhesive effectively prevents lifting and peeling at the interface, maintaining flexibility and restoring to the original shape even after prolonged bending, suitable for flexible displays and laminated members.

✦ Generated by Eureka AI based on patent content.

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Abstract

Provided is a pressure-sensitive adhesive for repeatedly flexed devices that is inhibited from lifting or peeling even when applied to a repeatedly flexed device and left in a flexed state for a long period of time, and that has excellent recovery properties from a flexed state. The adhesive is for bonding one flexible member and another flexible member that constitute a device that is repeatedly bent, and the creep compliance value measured after 3757 seconds of applying a stress of 3000 Pa to the adhesive is called the maximum creep compliance J(t). max (MPa -1 ) and then the stress applied to the adhesive is set to 0 Pa, and the creep compliance value measured after 3757 seconds is taken as the minimum creep compliance J(t) min (MPa -1 ) and the creep recovery rate calculated from the following formula (I) is 70% or more. Creep recovery rate (%) = (1 - J(t) min / J(t) max )×100 …(I)
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