Multilayer structure and method for manufacturing the same, as well as protective sheet and electronic device using the same

A multilayer structure with controlled thickness and composition addresses the challenge of water vapor barrier and peel strength in electronic device protective sheets, ensuring flexibility and adhesion through a substrate with metal oxide and inorganic phosphorus compound layers.

JP7876451B2Inactive Publication Date: 2026-06-19KURARAY CO LTD
View PDF 8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
KURARAY CO LTD
Filing Date
2021-11-02
Publication Date
2026-06-19
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Conventional multilayer structures for protective sheets in electronic devices fail to provide sufficient water vapor barrier properties and peel strength while maintaining flexibility, leading to increased thickness and compromised performance in flexible electronic devices.

Method used

A multilayer structure comprising a substrate with at least two layers containing a reaction product of a metal oxide and an inorganic phosphorus compound, laminated with thermoplastic resin layers via adhesive layers, achieving a total thickness of 15-120 μm and moisture permeability of 1.0 × 10⁻⁶ g/m²/day, with controlled thermal shrinkage to maintain peel strength and flexibility.

Benefits of technology

The multilayer structure exhibits excellent water vapor barrier properties and peel strength from sealing materials, while maintaining flexibility, by balancing layer thickness and thermal shrinkage to enhance adhesion and durability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007876451000003
    Figure 0007876451000003
  • Figure 0007876451000001
    Figure 0007876451000001
  • Figure 0007876451000002
    Figure 0007876451000002
Patent Text Reader

Abstract

A multilayer structure which is provided with: a multilayer body that comprises a base material (X) and at least two layers (Y) that are arranged on both surfaces of the base material (X); and layers (Z) that are mainly composed of a thermoplastic resin and are superposed on both surfaces of the multilayer body, with adhesive layers (I) being respectively interposed therebetween. Each layer (Y) contains a reaction product (D) of a metal oxide (A) that contains an aluminum atom, and an inorganic phosphorus compound (BI); the base material (X) has a thickness of from 5 μm to 100 μm; each layer (Z) has a thickness of from 5 μm to 100 μm; the total thickness of the layers is from 15 μm to 120 μm; the layers (Y) may be the same as or different from each other; the adhesive layers (I) may be the same as or different from each other; the layers (Z) may be the same as or different from each other; and the water vapor transmission rate as determined in accordance with ISO 15106-5 is 1.0 × 10-2 g / m2·day or less.
Need to check novelty before this filing date? Find Prior Art