Adhesive Sheet Primer Layer Anchoring Characteristics
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Solution Overview
Problem
Adhesive sheets often experience separation of the adhesive layer from the base material during peeling, leading to inadequate anchoring characteristics, especially when stored for long periods or exposed to high temperatures.
Innovation Solution
An adhesive sheet comprising a base material, a primer layer with cross-linked polyurethane containing polyoxyalkylene polyol and tri- or higher-functional polyisocyanate, and a radiation-cured adhesive layer, which enhances anchoring characteristics by ensuring the adhesive layer remains bonded to the base material even after storage and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer layer is added to improve anchoring characteristics, then adhesion between base material and adhesive layer is improved, but device complexity increases
Solution Approach 1:
A primer layer comprising cross-linked polyurethane is introduced as an intermediary between the base material and the radiation-cured adhesive layer. This primer layer specifically addresses the anchoring problem by providing chemical cross-linking that mechanically and chemically bonds the adhesive layer to the base material, preventing separation during peeling while maintaining overall structural simplicity.
2Reliability
If cross-linked polyurethane primer layer is used to prevent separation, then anchoring effect is improved, but manufacturing complexity increases
Solution Approach 1:
The primer layer utilizes cross-linked polyurethane with specific compositional parameters (polyoxyalkylene polyol and tri- or higher-functional polyisocyanate) that provide excellent anchoring characteristics. The cross-linking density and chemical composition are optimized to ensure strong adhesion while maintaining manufacturability through standard coating and curing processes.
3Duration of action of stationary object
If adhesive sheet is stored for long period, then adhesion stability should be maintained, but separation occurs at high temperature
Solution Approach 1:
The cross-linked polyurethane primer layer is designed beforehand to provide thermal and temporal stability. The cross-linking structure creates a resilient buffer that accommodates thermal expansion and degradation during long-term storage, preventing adhesive layer separation even under high-temperature conditions that would otherwise cause failure.
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 anchoring characteristics and prevents separation of the adhesive layer from the base material, maintaining strong adhesion even after prolonged storage and high-temperature exposure.
Implementation Method 1
the primer layer containing a cross-linked polyurethane having, as constituents, a polyol including polyoxyalkylene polyol, and a polyisocyanate
Implementation Method 2
an adhesive layer cured by radiation
Data Source
AI summary
An adhesive sheet comprising a base material, a primer layer, and an adhesive layer cured by radiation, arranged in this order. The primer layer contains a cross-linked polyurethane comprising a polyol and a polyisocyanate. The polyols include polyoxyalkylene polyols such as polyoxypropylene polyol and polyoxyethylene polyoxypropylene polyol.