Polyester Pressure-Sensitive Adhesive for Surface Protection
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Solution Overview
Problem
Current pressure-sensitive adhesive sheets for surface protection, such as those used on electronic devices, face challenges with high costs, poor wettability, and staining issues due to the use of silicone-based and acryl-based adhesives, and require environmentally friendly alternatives that are cost-effective and provide good peelability and anti-staining properties.
Innovation Solution
A polyester-based pressure-sensitive adhesive composition is developed using plant-derived raw materials, comprising a polyester obtained by condensation polymerization of a dicarboxylic acid and a tricarboxylic acid with a specific weight ratio, combined with a diol component and a crosslinking agent, which forms a pressure-sensitive adhesive sheet with excellent wettability, light peelability, and anti-staining properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone-based pressure-sensitive adhesive is used, then wettability to adherend is improved, but cost increases
Solution Approach 1:
The patent changes the chemical composition parameters by using polyester-based adhesive with specific molecular weight (5000-150000) and controlled hydroxyl value (5-50 mg KOH/g) to achieve good wettability without relying on expensive silicone-based materials. This parameter optimization allows the adhesive to spread properly on display surfaces while maintaining cost-effectiveness.
2Ease of manufacture
If acryl-based pressure-sensitive adhesive is used, then cost is reduced, but plasticizer bleeding and staining occur
Solution Approach 1:
The patent replaces expensive silicone-based adhesives with cost-effective polyester-based adhesives that do not require plasticizers, thereby eliminating the staining problem associated with acryl-based adhesives while maintaining affordability. The polyester composition provides inherent stability without harmful bleeding components.
Solution Approach 2:
The patent creates a composite polyester-based adhesive system combining polyols with specific molecular weights and hydroxyl values to achieve both cost-effectiveness and stain-free performance. This composite approach eliminates the need for separate plasticizer additives that cause staining in acryl-based systems.
3Object-affected harmful factors
If polyester-based pressure-sensitive adhesive from plant-derived materials is used, then environmental friendliness is improved, but cost increases
Solution Approach 1:
The patent optimizes parameters including polyester molecular weight (5000-150000), hydroxyl value (5-50 mg KOH/g), and carboxyl value (10-50 mg KOH/g) to achieve environmentally friendly plant-derived materials at competitive costs. These parameter controls ensure the adhesive performs well while maintaining economic viability.
4Object-generated harmful factors
If polyester-based pressure-sensitive adhesive is used, then anti-staining property is improved, but wettability may be compromised
Solution Approach 1:
The patent carefully balances parameters including hydroxyl value (5-50 mg KOH/g) and molecular weight (5000-150000) to ensure the polyester-based adhesive maintains both anti-staining properties and adequate wettability. This parameter optimization prevents staining while ensuring proper spreading on adherends.
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 cost-effective, environmentally friendly pressure-sensitive adhesive sheet that maintains excellent wettability and peelability while preventing adhesive residues and staining, suitable for surface protection applications.
Implementation Method 1
a crosslinking agent, wherein the carboxylic acid component contains a dicarboxylic acid having a side chain in an amount of 50 to 90% by weight and a tricarboxylic acid having a side chain in an amount of 10 to 50% by weight
Implementation Method 2
having adhesive strength proper for light peeling at the time of peeling off
Data Source
AI summary
A polyester-based pressure-sensitive adhesive composition which can be produced even from plant-derived raw materials with no need of using a costly silicone-based pressure-sensitive adhesive or the like and which is usable for producing a pressure-sensitive adhesive sheet excellent in wettability to an adherend, light peelability (removability), anti-staining property (little adhesive residues), and workability, and to provide a pressure-sensitive adhesive sheet using the composition. A polyester-based pressure-sensitive adhesive composition comprising a polyester obtained by condensation polymerization of at least a carboxylic acid component and a diol component, and a crosslinking agent, wherein the carboxylic acid component contains a dicarboxylic acid having a side chain in an amount of 50 to 90% by weight and a tricarboxylic acid having a side chain in an amount of 10 to 50% by weight, and wherein the polyester has a weight average molecular weight of 5000 to 150000.