Adhesive Tape With Continuous Polymer Phase for High Shear Strength
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Solution Overview
Problem
Existing adhesive systems for structural bonding face challenges in achieving high shear strengths while maintaining pressure-sensitive adhesiveness, as high epoxide fractions necessary for strong bonds often compromise pressure-sensitive adhesiveness, and current solutions like acrylate-based adhesives require storage under cool conditions and have reduced wetting capacity.
Innovation Solution
A pressure-sensitive adhesive tape with a continuous polymer phase and high reactive resin content, allowing up to 85 wt% reactive resin fraction, where the reactive resin is present in homogeneous solution in the polymer phase, enabling high epoxide fractions without losing pressure-sensitive adhesiveness, and forming a continuous epoxide phase upon curing for enhanced shear strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high epoxide fraction is used to achieve high shear strength, then structural bonding strength is improved, but pressure-sensitive adhesiveness deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating specific polymers (polyurethane, polyester, polyacrylate, polymethacrylate, or polyamide) alongside the epoxide resin. This parameter change allows the adhesive to maintain pressure-sensitive adhesiveness even with high epoxide fractions (≥50 wt%), thereby resolving the contradiction between achieving high shear strength and maintaining pressure-sensitive adhesiveness
Solution Approach 2:
The invention creates a composite adhesive material consisting of epoxide resin combined with specific polymers. This composite structure enables the adhesive to exhibit both the high strength characteristics of epoxide resin and the pressure-sensitive adhesiveness provided by the polymer matrix, thus resolving the technical contradiction between strength and ease of operation
2Strength
If high epoxide fraction is used to improve peel adhesion, then bonding strength is improved, but pressure-sensitive adhesiveness is lost
Solution Approach 1:
The invention modifies the adhesive composition by incorporating specific polymers that maintain pressure-sensitive adhesiveness even when epoxide fraction is high (≥50 wt%). This parameter change enables the adhesive to achieve high peel adhesion through epoxide crosslinking while the polymer matrix preserves pressure-sensitive adhesiveness, resolving the contradiction between peel adhesion and pressure-sensitive adhesiveness
3Ease of operation
If acrylate-based adhesives are used to achieve pressure-sensitive adhesiveness, then ease of application is improved, but storage stability deteriorates
Solution Approach 1:
The invention replaces the unstable acrylate-based adhesive system with an epoxide resin-based system that offers superior storage stability. While acrylate adhesives require cool storage and have reduced shelf life, the epoxide-based adhesive maintains pressure-sensitive adhesiveness without requiring special storage conditions, effectively replacing a short-lived, unstable system with a stable, long-lasting alternative
4Ease of operation
If acrylate-based adhesives are used to achieve pressure-sensitive adhesiveness, then ease of application is improved, but wetting capacity deteriorates
Solution Approach 1:
The invention replaces the acrylate-based adhesive system with an epoxide resin-based system that maintains both pressure-sensitive adhesiveness and superior wetting capacity. The epoxide-based adhesive does not suffer from the reduced wetting capacity that plagues acrylate systems, while also eliminating the requirement for cool storage conditions
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 adhesive tape achieves significantly higher shear strengths after curing while maintaining pressure-sensitive adhesiveness, with improved storage stability and wetting capacity, suitable for applications in the automotive industry and other demanding bonding requirements.
Implementation Method 1
the reactive resin is present in homogeneous solution in the polymer phase
Implementation Method 2
forming a continuous epoxide phase upon curing for enhanced shear strengths
Data Source
AI summary
An adhesive tape containing an adhesive comprisingat least one polymeroptionally a tackifier resinat least one reactive resin, the adhesive comprising at least 104 parts of the at least one reactive resin per 100 parts of polymer and tackifier resinat least one initiator and/or curing agent and/or acceleratorwhere the adhesive is a pressure sensitive adhesive, the at least one polymer being present as continuous polymer phase in the uncured state of the pressure sensitive adhesive.