Multilayer Pressure-Sensitive Adhesive Sheet with Photo-Crosslinking
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Solution Overview
Problem
Existing pressure-sensitive adhesives (PSAs) face a trade-off in achieving high deformation resistance while maintaining good surface conformity to adherends.
Innovation Solution
A multilayer PSA sheet with a photo-crosslinkable polymer layer, which is crosslinked upon exposure to light, enhancing deformation resistance while maintaining surface conformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a PSA is designed to deform in conformity to the surface structure of an adherend, then surface conformity is improved, but deformation resistance against stress decreases
Solution Approach 1:
The PSA layer is divided into two functional sublayers: layer A (photo-crosslinkable PSA layer) and layer B (non-photo-crosslinkable PSA layer). Layer A provides deformation resistance through photo-crosslinking, while layer B maintains surface conformity and adhesion. This segmentation allows each sublayer to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the PSA layer are assigned different properties: layer A is designed to be photo-crosslinkable for high deformation resistance, while layer B is designed to be non-photo-crosslinkable for good surface conformity. This local differentiation of material properties enables simultaneous achievement of both surface conformity and deformation resistance.
2Strength
If a PSA layer is made to have high deformation resistance, then bond strength is improved, but surface conformity to adherend decreases
Solution Approach 1:
The PSA layer is segmented into layer A (photo-crosslinkable) and layer B (non-photo-crosslinkable). Layer A provides the deformation resistance needed for bond strength, while layer B maintains the surface conformity required for proper adhesion. This segmentation resolves the contradiction by distributing different functional requirements to different sublayers.
Solution Approach 2:
The PSA layer is constructed as a composite of two different PSA materials with complementary properties. The photo-crosslinkable layer A and non-photo-crosslinkable layer B work together synergistically, with layer A providing structural integrity and deformation resistance, while layer B provides surface conformity and wetting capability.
3Strength
If a photo-crosslinkable polymer layer is used to enhance deformation resistance, then bond strength is improved, but ease of removal decreases
Solution Approach 1:
The PSA layer is segmented such that only layer A is photo-crosslinkable, while layer B remains non-photo-crosslinkable. This allows the photo-crosslinked layer A to provide deformation resistance for strong bonding, while the non-crosslinked layer B maintains ease of removal and reworkability.
Solution Approach 2:
Different regions of the PSA layer have different crosslinking states: layer A is photo-crosslinked for strong, permanent bonding with high deformation resistance, while layer B remains uncrosslinked for ease of removal and repositioning. This local differentiation of chemical state resolves the contradiction between bond strength and ease of removal.
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
The PSA sheet achieves high deformation resistance and excellent surface conformity, allowing for tight adhesion to adherends while being easily removable after photo-crosslinking.
Implementation Method 1
The layer B is a photo-crosslinkable PSA layer comprising a photo-crosslinkable polymer. The PSA sheet can obtain higher deformation resistance by photo-crosslinking of the layer B.
Data Source
AI summary
Provided is a PSA sheet having a PSA layer. The PSA layer has a multilayer structure comprising a layer A forming one face of the PSA layer and a layer B placed on the backside of the layer A. The layer B is a photo-crosslinkable PSA layer comprising a photo-crosslinkable polymer.