β-1,3-Glucan Adhesive Composition for Smooth PSA Sheet Surfaces
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Solution Overview
Problem
Existing pressure-sensitive adhesive compositions based on β-1,3-glucan derivatives tend to result in uneven surfaces, leading to variations in thickness and adhesive strength due to the formation of unwanted gels and fish-eye-shaped foreign matter.
Innovation Solution
A pressure-sensitive adhesive composition with a tan δ of 0.7 or more at 200°C, incorporating a β-1,3-glucan derivative, is formulated to inhibit surface unevenness by controlling the dynamic viscoelastic properties, using a two-step solvent-based synthesis method to introduce substituents and minimize gel formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a β-1,3-glucan derivative is synthesized by the method disclosed in Patent Literature 1, then the pressure-sensitive adhesive composition can be prepared, but unevenness occurs on the surface of the pressure-sensitive adhesive sheet
Solution Approach 1:
The invention changes the chemical parameters of the β-1,3-glucan derivative by controlling the degree of substitution and selecting specific substituents (acyl groups with 1-6 carbon atoms). This parameter optimization prevents gel formation and ensures surface smoothness while maintaining adhesive strength consistency.
Solution Approach 2:
The invention converts the potential harm of gel formation into a benefit by carefully controlling the synthesis conditions and substituent characteristics. By using acyl groups with specific carbon chain lengths and controlling the degree of substitution, the composition achieves both smooth surface and reliable adhesive strength.
2Manufacturing precision
If unwanted gels and fish-eye-shaped foreign matter are formed during synthesis, then the pressure-sensitive adhesive composition can be produced, but surface unevenness and thickness variation occur
Solution Approach 1:
The invention extracts and removes the harmful gels and fish-eye-shaped foreign matter by optimizing the synthesis method. The two-step synthesis process with specific solvent selection and substitution control prevents these harmful byproducts from forming in the first place, ensuring thickness uniformity.
Solution Approach 2:
The invention performs preliminary actions during the synthesis process by using a two-step method with specific solvents (solvent A for first substitution, solvent B for second substitution). This preliminary control prevents gel formation before it can cause surface unevenness and thickness variation.
3Reliability
If the surface of the pressure-sensitive adhesive sheet becomes uneven, then the pressure-sensitive adhesive sheet can be formed, but variations in adhesive strength occur
Solution Approach 1:
The invention optimizes the physical and chemical parameters of the adhesive composition, specifically controlling the tan δ value at 200°C to be 0.7 or more. This parameter control ensures both surface flatness and consistent adhesive strength, resolving the contradiction between these two properties.
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 composition ensures a smooth surface and consistent adhesive strength by reducing gel formation and fish-eye defects, enhancing the reliability and performance of pressure-sensitive adhesive sheets.
Implementation Method 1
the pressure-sensitive adhesive composition has a tan δ of 0.7 or more at 200° C. as determined by the following test: a disc-shaped evaluation sample is produced from the pressure-sensitive adhesive composition, and the evaluation sample is subjected to a dynamic viscoelasticity measurement to determine a tan δ at 200° C.
Data Source
AI summary
The present invention provides a pressure-sensitive adhesive composition suitable for forming a pressure-sensitive adhesive sheet having a smooth surface. The pressure-sensitive adhesive composition of the present invention includes a β-1,3-glucan derivative G. The pressure-sensitive adhesive composition has a tan δ of 0.7 or more at 200° C. as determined by the following test. Test: a disc-shaped evaluation sample is produced from a pressure-sensitive adhesive composition. The evaluation sample is subjected to a dynamic viscoelasticity measurement to determine a tan δ thereof at 200° C.