Adhesion Layer Side-Contact for Laminated Body Peeling Control
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Solution Overview
Problem
The handleability of laminated bodies with a resin layer as a protective layer on an adhesion layer is challenging, as the resin layer is prone to easy peeling during transportation and difficult to peel off during the formation of a polyimide resin layer.
Innovation Solution
A laminated body configuration with a glass substrate, an adhesion layer, and a resin layer, where the adhesion layer has a side-contact portion outside the resin layer's outer edge, contacting at least a part of its side surface, and a heat treatment process at or above the adhesion layer's softening point to control the peeling of the resin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin layer is laminated on an adhesion layer to form a protective layer, then the adhesion layer can be used for forming a polyimide resin layer, but the resin layer becomes easily peeled off during transportation and handling
Solution Approach 1:
The adhesion layer is designed with non-uniform thickness: a thicker first adhesion layer portion at the peripheral edge and a thinner second adhesion layer portion in the central region. This local quality variation allows the peripheral edge to provide strong peeling resistance during handling, while the central region allows easy peeling during polyimide resin layer formation.
Solution Approach 2:
The adhesion layer is segmented into two distinct portions with different thicknesses and functions: the first adhesion layer portion (peripheral) maintains the resin layer during handling, while the second adhesion layer portion (central) facilitates easy peeling during polyimide formation. This segmentation resolves the contradiction by assigning different peeling characteristics to different regions.
2Ease of operation
If the adhesion layer is made thinner to facilitate easy peeling during polyimide formation, then peeling becomes easier, but the resin layer becomes more prone to peeling during transportation
Solution Approach 1:
Instead of uniformly thinning the adhesion layer, the invention applies local quality variation: the first adhesion layer portion at the peripheral edge maintains sufficient thickness for handling stability, while the second adhesion layer portion in the central region is thinned to facilitate easy peeling during polyimide formation. This resolves the contradiction by optimizing thickness locally rather than globally.
Solution Approach 2:
The adhesion layer is divided into two functional segments with different thicknesses: the peripheral first adhesion layer portion (thicker) provides handling reliability, while the central second adhesion layer portion (thinner) provides ease of peeling during polyimide formation. This segmentation allows simultaneous optimization of both contradictory requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents the resin layer from being easily peeled off during handling while allowing for easy peeling during treatment, enhancing the manufacturing process of electronic devices.
Implementation Method 1
a step 2 of performing a heat treatment on the laminated substrate obtained in step 1 at a temperature equal to or higher than a softening point of the adhesion layer
Data Source
AI summary
A laminated body includes a glass substrate, an adhesion layer, and a resin layer in this order. The adhesion layer includes a side-contact portion. The side-contact portion is located outside an outer edge of the resin layer in a part of an entire circumferential of the outer edge when observing the laminated body from a normal direction of a surface of the glass substrate, and is in contact with at least a part of a side surface of the resin layer.