Foaming Adhesive Sheet Epoxy Acrylic Composition
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Solution Overview
Problem
Existing foaming adhesive sheets face challenges in achieving good blocking resistance, adhesiveness, and crack resistance, with previous methods requiring solvents for application and having limitations in handling and curing processes.
Innovation Solution
A composition comprising an epoxy resin with a softening temperature of 50°C or more and an epoxy equivalent of 5000 g/eq or less, combined with a second epoxy resin of higher softening temperature and weight-average molecular weight, and an acrylic resin with a weight-average molecular weight of 50,000 or more, to create a foaming adhesive sheet with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foaming adhesive sheet is used, then adhesiveness and crack resistance are improved, but blocking resistance deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the acrylic resin to 50,000 or more, which fundamentally alters the adhesive composition's properties. This parameter change enables the adhesive to simultaneously achieve high adhesiveness and crack resistance while maintaining low blocking resistance, resolving the technical contradiction through precise control of molecular characteristics
Solution Approach 2:
The patent creates a composite adhesive system by combining epoxy resin with high molecular weight acrylic resin (50,000 or more) and specific foaming agents. This composite material approach allows the adhesive to exhibit multiple desirable properties simultaneously - high adhesiveness, crack resistance, and low blocking resistance - that cannot be achieved with single materials
2Reliability
If a foaming adhesive sheet is used, then adhesiveness and crack resistance are improved, but handling efficiency deteriorates
Solution Approach 1:
The patent specifies the acrylic resin molecular weight as 50,000 or more, which optimizes the balance between crack resistance and handling properties. This parameter control ensures the adhesive maintains appropriate viscosity and workability while achieving the desired crack resistance performance
3Ease of manufacture
If conventional adhesive methods are used, then application is simple, but solvent application and volatilization time are required
Solution Approach 1:
The patent extracts and eliminates the solvent component from the adhesive system by using a 100% solid composition of epoxy resin, acrylic resin, and foaming agent. This extraction of the solvent phase completely removes the volatilization step, allowing the adhesive to be applied and immediately activated without waiting for solvent evaporation
Solution Approach 2:
The patent utilizes the phase transition of the foaming agent (from solid to gas) as the primary mechanism for adhesive activation and foam formation, replacing the evaporative phase transition of solvents. This substitution allows the adhesive to cure and expand in place without requiring solvent volatilization time
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 a foaming adhesive sheet with enhanced blocking resistance, adhesiveness, and crack resistance, eliminating the need for solvents and improving handling efficiency, while maintaining high adhesiveness and crack resistance.
Implementation Method 1
a foaming agent, wherein a weight-average molecular weight of the acrylic resin is 50,000 or more
Implementation Method 2
an epoxy resin, an acrylic resin compatibilized with the epoxy resin, a curing agent
Data Source
AI summary
An adhesive composition including an epoxy resin, an acrylic resin compatibilized with the epoxy resin, a curing agent, and a foaming agent, wherein, as the epoxy resin, the adhesive composition includes a first epoxy resin with a softening temperature of 50° C. or more and an epoxy equivalent of 5000 g/eq or less, and a second epoxy resin with a softening temperature higher than the first epoxy resin and a weight-average molecular weight of 20,000 or more, and a weight-average molecular weight of the acrylic resin is 50,000 or more.