Pressure-Sensitive Adhesive Composition for Heat-Stable Clean Peeling
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Solution Overview
Problem
Existing pressure-sensitive adhesive sheets struggle with maintaining adhesive force in high-temperature environments and are difficult to peel without leaving residue, hindering recycling and causing damage.
Innovation Solution
A pressure-sensitive adhesive sheet with a specific composition including an elastomer with 25% or more styrene and a tackifier with a softening point of 100°C or higher, in a ratio of 0.1 to 0.8, ensuring a tensile force greater than the adhesive force, allowing easy peeling after exposure to high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing pressure-sensitive adhesive sheets are used to achieve strong initial adhesive force, then the adhesive force to adherend is improved, but the ability to peel after high-temperature exposure deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by specifying an elastomer with 25% or more styrene content and a tackifier with softening point of 100°C or higher in a specific ratio range (0.1 to 0.8). This parameter optimization enables the adhesive to maintain strong initial bonding while allowing easy peeling after high-temperature exposure, resolving the contradiction between adhesive strength and peelability.
Solution Approach 2:
The patent creates a composite adhesive system combining specific elastomer (with 25% or more styrene) and tackifier (with softening point of 100°C or higher) in controlled proportions. This composite material approach allows the adhesive layer to exhibit dual characteristics: strong initial adhesion through the elastomer-tackifier combination and controlled peelability after thermal exposure, simultaneously addressing both requirements.
2Strength
If existing pressure-sensitive adhesive sheets are designed for strong adhesion, then the adhesive force is improved, but residue left after peeling increases
Solution Approach 1:
By optimizing the chemical composition parameters—specifically using elastomer with 25% or more styrene and tackifier with softening point of 100°C or higher in a ratio of 0.1 to 0.8—the patent achieves complete peelability without residue while maintaining strong adhesive force. The parameter control ensures the adhesive bonds strongly initially but releases cleanly after thermal exposure.
3Temperature
If pressure-sensitive adhesive sheets are exposed to high-temperature environment for long period, then the adhesive force may degrade, but the peeling process may cause damage
Solution Approach 1:
The patent optimizes the adhesive composition parameters (elastomer with 25% or more styrene, tackifier with softening point of 100°C or higher, in ratio 0.1 to 0.8) to enable the adhesive to withstand high-temperature exposure while maintaining controlled peelability. This prevents both adhesive degradation and adherend damage during the peeling process after thermal exposure.
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 maintains strong adhesive force initially and after prolonged high-temperature exposure, facilitating easy peeling and recycling without residue.
Implementation Method 1
a pressure-sensitive adhesive layer including: an elastomer including 25% or more styrene on a mass basis; and a tackifier having a softening point of 100°C or higher
Implementation Method 2
the pressure-sensitive adhesive sheet satisfies a requirement that a tensile force F A [N/20 mm] is greater than an adhesive force F B [N/20 mm]
Data Source
Figure 1~3
AI summary
A pressure-sensitive adhesive sheet 1a includes a pressure-sensitive adhesive layer 11. The pressure-sensitive adhesive layer 11 includes an elastomer and a tackifier. The elastomer includes 25% or more styrene on a mass basis. The tackifier has a softening point of 100°C or higher. A ratio RET of a content of the tackifier to a content of the elastomer in the pressure-sensitive adhesive layer 11 is 0.1 to 0.8. The pressure-sensitive adhesive sheet 1a satisfies a requirement that a tensile force FA [N/20 mm] is greater than an adhesive force FB [N/20 mm]. The pressure-sensitive adhesive sheet 1a has an adhesive force Fc of not less than 1.0 N/20 mm. The adhesive force FB is a 90° peel adhesive force [N/20 mm] measured after adhering a test piece prepared from the pressure-sensitive adhesive sheet 1a to a testing plate and maintaining an environment temperature of the adhered test piece at 100°C for seven days.