Pressure-Sensitive Adhesive Layers for Moderate-Temperature Crosslinking
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Solution Overview
Problem
Existing adhesive bonding systems, particularly two-component polymerization and thermal crosslinking systems, face challenges such as messiness in application, storage stability issues, and potential damage to temperature-sensitive materials due to high activation temperatures, which limit their precision and robustness in bonding.
Innovation Solution
A multi-component adhesive system comprising two pressure-sensitive adhesive layers with carboxyl groups that can be crosslinked at moderate temperatures using specific activators and crosslinkers, allowing for precise positioning and robust bonding without the need for high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal crosslinking is used to achieve high bonding strength and stability, then bonding strength is improved, but temperature-sensitive substrates are damaged due to high activation temperatures
Solution Approach 1:
The patent changes the activation temperature parameter from high (thermal crosslinking) to low (room temperature or moderate temperature), enabling crosslinking of pressure-sensitive adhesive layers without damaging temperature-sensitive substrates while still achieving robust bonding strength through chemical crosslinking mechanisms
Solution Approach 2:
The patent replaces thermal activation (heat-based mechanism) with chemical activation (reactive mechanism), where crosslinking is initiated by chemical reactions between functional groups in the adhesive layers rather than by thermal energy, thereby avoiding damage to temperature-sensitive materials
2Strength
If liquid 2-component polymerization bonding systems are used to achieve strong bonds, then bonding strength is improved, but application becomes messy and positioning precision deteriorates
Solution Approach 1:
The patent divides the adhesive system into separate pressure-sensitive adhesive layers that can be precisely positioned and applied in a controlled manner before crosslinking, avoiding the messiness of liquid 2-component systems while maintaining strong bonding through subsequent crosslinking of the layered structure
Solution Approach 2:
The patent performs preliminary positioning and application of adhesive layers in a stable, non-liquid state before crosslinking occurs, allowing for precise placement and alignment without the handling difficulties of liquid adhesives, then activates crosslinking after positioning is complete
3Stability of the object's composition
If chemical crosslinking at high temperatures is used to achieve storage stability, then stability is improved, but the system requires even higher temperatures for activation
Solution Approach 1:
The patent changes the activation temperature parameter to room temperature or moderate temperature ranges, enabling crosslinking to proceed without requiring high temperatures while still achieving sufficient storage stability through the crosslinked network structure formed in the pressure-sensitive adhesive layers
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 system enables storage-stable, easily applicable, and robust adhesive bonds with improved precision and performance, suitable for temperature-sensitive substrates, and enhances bonding strength and stability.
Implementation Method 1
two pressure-sensitive adhesive layers A and B, wherein independently of one another each comprises at least one polymer containing two or more carboxyl groups; wherein in the pressure-sensitive adhesive layer A, some of the carboxyl groups of the polymer comprising them are activated as a result of reaction with an activator AA; wherein the pressure-sensitive adhesive layer A comprises at least one crosslinker VA which is suitable for the crosslinking reaction with the carboxyl groups of the polymers comprising them in the pressure-sensitive adhesive layers A and B
Data Source
AI summary
The intention is to provide an adhesive system which is stable in storage and which when used permits precise positioning of the adhesive, and which can be crosslinked without exceeding moderate temperatures. The said system is moreover intended to provide strong adhesive bonds that attain high performance levels. This is achieved via a kit containing at least two pressure-sensitive adhesive layers A and B, where the two pressure-sensitive adhesive layers A and B mutually independently respectively comprise at least one polymer containing a multiplicity of carboxy groups; in the pressure-sensitive adhesive layer A a portion of the carboxy groups of the polymer containing these has been activated by reaction with an activator AA; and—the pressure-sensitive adhesive layer A—at least one crosslinking agent VA which can enter into a crosslinking reaction with the carboxy groups of the polymer containing these of the pressure-sensitive adhesive layers A and B, but which in the pressure-sensitive adhesive layer A is not significantly reactive; —the pressure-sensitive adhesive layer B—at least one crosslinking agent VB which can accelerate the crosslinking reaction of the carboxy groups of the polymer containing these of the pressure-sensitive adhesive layer B with the crosslinking agent VA and which can permit and accelerate the crosslinking reaction of the carboxy groups of the polymer containing these of the pressure-sensitive adhesive layer A with the crosslinking agent VA and can enter into a crosslinking reaction with the activated carboxy groups of the polymer containing these of the pressure-sensitive adhesive layer A. The invention moreover also relates to an adhesive tape which is obtainable via contact between the pressure-sensitive adhesive layers of the kit, and to a process for producing said adhesive tape.