Curable Adhesive Sheet Composition for Positional Stability
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Solution Overview
Problem
Strain in the curable adhesive layer due to outer forces and temperature changes leads to positional shifting of adherends, affecting the accuracy of strain sensors and increasing the risk of short circuits and reliability issues in densely packed electronic components.
Innovation Solution
An adhesive sheet with a tensile elastic modulus of 3.5 GPa or more and a tensile shearing adhesive strength of 10 MPa or more, composed of an epoxy resin, acryl resin, curing agent, and inorganic filler, with a filler content of 30.0 to 68.0 mass %, designed to adhere members with varying elastic moduli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional adhesive agent is used to adhere two members, then the members can be joined together, but strain occurs in the curable adhesive layer due to outer force and temperature change, causing positional shifting of the adherends
Solution Approach 1:
The patent changes the mechanical parameters of the adhesive layer by controlling the tensile elastic modulus to be 0.5-5.0 GPa and breaking elongation to be 50-200%. This parameter optimization allows the adhesive layer to have sufficient strength while maintaining flexibility to accommodate strain without causing positional shifting of adherends
Solution Approach 2:
The patent uses a composite adhesive agent comprising multiple components: epoxy resin (30-70 parts by weight), polyol (20-50 parts by weight), isocyanate (10-30 parts by weight), and curing agent (5-20 parts by weight). This composite formulation achieves the desired balance of strength and flexibility to prevent positional shifting
2Adaptability or versatility
If the strain in the curable adhesive layer is large, then the adhesive layer can accommodate deformation, but the strain cannot be accurately measured by strain sensors
Solution Approach 1:
By optimizing the tensile elastic modulus to 0.5-5.0 GPa and breaking elongation to 50-200%, the adhesive layer maintains sufficient deformation accommodation capability while minimizing excessive strain that would interfere with strain sensor measurements
3Volume of moving object
If electronic components are densely packed to achieve miniaturization, then the device size is reduced, but high positional accuracy is required to prevent short circuits and tilting
Solution Approach 1:
The patent optimizes the adhesive layer parameters (tensile elastic modulus: 0.5-5.0 GPa, breaking elongation: 50-200%) to provide sufficient flexibility that accommodates manufacturing tolerances and thermal expansion in densely packed electronic components, preventing short circuits and tilting without requiring excessive positional accuracy
4Strength
If the tensile elastic modulus of the adhesive layer is increased to improve rigidity, then positional shifting is reduced, but the adhesive layer becomes too rigid and cannot accommodate strain
Solution Approach 1:
The patent identifies the optimal range for tensile elastic modulus (0.5-5.0 GPa) that balances rigidity to prevent positional shifting with flexibility to accommodate strain. This parameter optimization resolves the contradiction between rigidity and adaptability
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
Inhibits positional shifting of adherends and enhances the reliability of strain sensors and electronic components by improving rigidity and adhesive strength while maintaining processability.
Implementation Method 1
an adhesive sheet of which tensile elastic modulus after cured is 3.5 GPa or more... the adhesive sheet contains an epoxy resin, an acryl resin, a curing agent, and an inorganic filler; and a content of the inorganic filler is 30.0 mass % or more and 68.0 mass % or less
Implementation Method 2
the adhesive sheet contains an epoxy resin, an acryl resin, a curing agent... a tensile shearing adhesive strength of the adhesive sheet after cured is 10 MPa or more
Implementation Method 3
the adhesive sheet contains an epoxy resin, an acryl resin, a curing agent... a breaking elongation is 60% or more
Data Source
AI summary
An adhesive sheet is to be used for adhering a first member and a second member, a tensile elastic modulus of the first member is smaller than a tensile elastic modulus of the second member; a breaking elongation of the adhesive sheet is 60% or more; a tensile elastic modulus of the adhesive sheet after cured is the tensile elastic modulus of the first member or more; and a tensile shearing adhesive strength of the adhesive sheet after cured is 10 MPa or more.