Pressure Sensitive Adhesive Sheet With Hydrogen Abstraction Photoinitiator
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Solution Overview
Problem
Pressure sensitive adhesive sheets often suffer from insufficient adhesion to substrates, particularly with low-polarity materials like polyvinyl chloride or polyolefin, leading to detachment where the adhesive layer remains on the adherend, causing fouling.
Innovation Solution
A pressure sensitive adhesive sheet comprising a laminate of a resin film and a pressure sensitive adhesive layer, where the resin film contains a polymer capable of abstracting hydrogen upon energy ray irradiation, and the adhesive layer is formed by crosslinking an energy ray-crosslinkable composition, enhancing adhesion through direct crosslinking reactions at the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure sensitive adhesive sheet is used, then the adhesive layer can be applied to substrates, but the adhesion between the substrate and adhesive layer is insufficient, causing detachment and fouling of the adherend
Solution Approach 1:
The resin film is pre-formed with a photopolymerizable group and a hydrogen abstraction type photoinitiator before lamination. This preliminary preparation enables subsequent in-situ crosslinking at the substrate-adhesive interface through UV irradiation, ensuring strong adhesion without requiring post-attachment chemical modification or creating residue on the adherend.
Solution Approach 2:
The invention changes the chemical state of the resin film from a non-crosslinked condition to a crosslinked condition through UV irradiation. The photopolymerizable group undergoes polymerization reaction upon irradiation, forming a crosslinked structure that enhances adhesion to low-polarity substrates while maintaining clean detachment properties.
2Reliability
If the adhesion between substrate and adhesive layer is enhanced, then substrate adhesion improves, but the complexity of the manufacturing process increases
Solution Approach 1:
The invention merges the substrate formation process with the adhesive layer formation process by incorporating the photopolymerizable group and photoinitiator into the resin film that is laminated with the adhesive composition layer. This single lamination step creates both the substrate structure and the crosslinking capability for enhanced adhesion, eliminating the need for separate processing steps.
Solution Approach 2:
The resin film contains the hydrogen abstraction type photoinitiator that automatically initiates crosslinking when exposed to UV light during the lamination process. This self-initiating mechanism eliminates the need for external catalysts or complex activation processes, simplifying manufacturing while ensuring reliable adhesion through in-situ crosslinking.
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 solution provides excellent substrate adhesion and allows for clean detachment without fouling of the adherend, improving the reliability and performance of the adhesive sheet.
Implementation Method 1
the polymer (A) is a polymer from which the hydrogen abstraction type photoinitiator (B) is capable of abstracting a hydrogen
Implementation Method 2
the pressure sensitive adhesive layer is formable by irradiating an energy ray-crosslinkable pressure sensitive adhesive composition layer made of an energy ray-crosslinkable pressure sensitive adhesive composition with an energy ray
Data Source
AI summary
A pressure sensitive adhesive sheet, including a laminate of: a substrate; and a pressure sensitive adhesive layer, where the substrate is formable by irradiating a resin film including a polymer and a hydrogen abstraction type photoinitiator with an energy ray, where the hydrogen abstraction type photoinitiator is capable of abstracting a hydrogen from the polymer, the pressure sensitive adhesive layer is formable by irradiating an energy ray-crosslinkable pressure sensitive adhesive composition layer including an energy ray-crosslinkable pressure sensitive adhesive composition with an energy ray, and the laminate of the substrate and the pressure sensitive adhesive layer is formed by irradiating a laminate of the resin film and the energy ray-crosslinkable pressure sensitive adhesive composition layer with an energy ray.