Adhesive Composition for Bubble-Free Bonding
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Solution Overview
Problem
Conventional adhesive sheets with high initial adhesive force are not suitable for re-adhesion due to bubble formation and foreign matter introduction, requiring techniques to reduce bubbles, but these techniques compromise adhesive strength and reworkability.
Innovation Solution
An adhesive composition comprising an acrylic first polymer with a glass transition temperature of 0°C or less, a second polymer derived from specific monomers, and a crosslinking agent, which allows for low initial adhesive force and easy reworkability while enhancing adhesive strength after thermal treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive sheet with high adhesive force is used, then the adhesive force for fixing the substrate is sufficient, but bubbles and foreign matter cannot be easily removed requiring re-adhesion
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using a copolymer with specific monomer ratios (Formula 1 with n=10-30, Formula 2 or 3) combined with crosslinking agents. This parameter change enables the adhesive to exhibit low initial adhesive force for easy bubble removal while achieving high adhesive force after thermal treatment, resolving the contradiction between strong adhesion and bubble removal capability.
2Ease of operation
If surface grooves are formed on the adhesive surface, then bubbles can be easily removed, but the adhesive area becomes small reducing adhesive force
Solution Approach 1:
Instead of forming physical grooves that reduce adhesive area, the patent changes the chemical parameters of the adhesive composition. The specific copolymer formulation with crosslinking agents provides bubble removal capability through chemical means rather than physical surface modification, maintaining full adhesive contact area while enabling easy bubble removal.
3Ease of repair
If the adhesive sheet is designed for easy rework, then repositioning is possible, but sufficient adhesive force cannot be obtained
Solution Approach 1:
The patent makes the adhesive properties dynamic by using a temperature-responsive copolymer system. At low temperatures or initial bonding stages, the adhesive exhibits low adhesive force for easy rework. After thermal treatment, the adhesive force increases significantly, providing strong bonding. This dynamic behavior resolves the contradiction between ease of rework and sufficient adhesive force.
Solution Approach 2:
The patent utilizes temperature as a control parameter to change adhesive properties. The copolymer composition with crosslinking agents enables temperature-dependent adhesive force variation, allowing easy rework at lower temperatures and strong adhesion after thermal treatment, thus resolving the contradiction between reworkability and adhesive strength.
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 sheet exhibits excellent reworkability and improved adhesive force after thermal treatment, effectively addressing the limitations of conventional adhesive sheets by allowing easy removal of bubbles and foreign matter while maintaining strong substrate adhesion.
Implementation Method 1
an acrylic first polymer having a glass transition temperature of 0° C. or less
Implementation Method 2
a crosslinking agent
Data Source
AI summary
An adhesive composition comprising an acrylic first polymer having a glass transition temperature of 0° C. or less, a second polymer comprising a unit derived from a monomer represented by the following Chemical Formula 1 and Chemical Formula 2 or Chemical Formula 3, and a crosslinking agent, and an adhesive film comprising the same are provided.