Polyester Pressure-Sensitive Adhesive Layer for Thick Coating and Eco-Friendly Bonding
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Solution Overview
Problem
Conventional pressure-sensitive adhesive tapes, particularly those using silicone and acrylic adhesives, face challenges such as high cost, environmental impact due to solvent use, and limited thickness application, which are not suitable for modern electronic devices with small, curved components that require high adhesion and reliability.
Innovation Solution
A polyester-based pressure-sensitive adhesive layer is developed, comprising a polyester obtained by polycondensation of a dicarboxylic acid and a diol component, with a tackifier, offering a gel fraction of 15% to 40% by weight, and using plant-derived materials for eco-friendliness and cost-effectiveness, allowing for high adhesion and repulsion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylic pressure-sensitive adhesive is used, then adhesion performance is improved, but a large amount of organic solvent must be removed by heating and drying, reducing workability and having adverse environmental effects
Solution Approach 1:
The patent changes the fundamental parameter of adhesive chemistry from acrylic polymer to polyester polymer. This substitution fundamentally alters the adhesive's properties, enabling it to achieve high adhesion performance without requiring large amounts of organic solvent for processing, thus resolving the contradiction between adhesion performance and workability
Solution Approach 2:
The patent creates a polyester-based adhesive that copies the desirable adhesion properties of acrylic adhesives while eliminating their harmful characteristics. The polyester adhesive replicates the bonding capability without the need for extensive organic solvent removal, effectively copying the functional benefits while discarding the processing drawbacks
2Quantity of substance
If acrylic pressure-sensitive adhesive solution containing large amount of organic solvent is used, then adhesive composition is improved, but it is difficult to form pressure-sensitive adhesive layers by thick coating, limiting application thickness
Solution Approach 1:
The patent changes the chemical composition parameter from acrylic-based to polyester-based adhesive, which fundamentally alters the solvent requirements and coating characteristics. This parameter change enables the formation of thick adhesive layers without the limitations imposed by acrylic adhesive solutions containing large amounts of organic solvent
3Reliability
If silicone-based pressure-sensitive adhesive is used, then adhesion performance is improved, but cost increases and economy decreases
Solution Approach 1:
The patent substitutes expensive silicone-based adhesive with a more economical polyester-based adhesive. This replacement maintains the necessary adhesion performance for the application while significantly reducing material costs, aligning with the economic constraints of modern electronic device manufacturing
Solution Approach 2:
The patent changes the adhesive material parameter from silicone to polyester, which fundamentally alters both the performance characteristics and cost structure. This substitution achieves the desired adhesion performance through a different chemical mechanism that is more cost-effective than silicone-based solutions
4Reliability
If conventional pressure-sensitive adhesive compositions are used, then bonding capability is achieved, but environmental impact increases due to solvent use and petroleum resource depletion
Solution Approach 1:
The patent changes the fundamental chemical parameter from petroleum-derived acrylic or silicone polymers to polyester polymers. This parameter change enables the adhesive to maintain bonding capability while being derived from renewable resources and eliminating the need for large amounts of organic solvents, thereby reducing environmental impact
Solution Approach 2:
The patent converts the traditional harmful approach of using petroleum-based polymers and organic solvents into a beneficial environmentally-friendly solution. By substituting with polyester-based adhesive, the harmful environmental effects are transformed into a sustainable, eco-friendly bonding solution that maintains performance while reducing ecological damage
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 polyester-based adhesive layer provides a cost-effective, environmentally friendly solution with high adhesion, retention, and repulsion resistance, suitable for thin and thick applications, reducing solvent use and addressing the limitations of traditional adhesives in bonding modern electronic components.
Implementation Method 1
a polyester obtained by polycondensation of at least a dicarboxylic acid component and a diol component
Implementation Method 2
a tackifier, the polyester-based pressure-sensitive adhesive layer having a gel fraction of 15% by weight or more to less than 40% by weight
Data Source
AI summary
The purpose of the present invention is to provide: a polyester-based pressure-sensitive adhesive layer, for which a pressure-sensitive adhesive composition (pressure-sensitive adhesive solution) without any acrylic pressure-sensitive adhesive or the like which needs a large amount of an organic solvent and is difficult to apply thickly; to provide a polyester-based pressure-sensitive adhesive layer that is friendly to the global environment, can be applied thickly, has a high level of cost effectiveness and workability, and also has a high level of adhesion, retention, and repulsion resistance; and to provide a pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive tape having such a pressure-sensitive adhesive layer. The invention is directed to a polyester-based pressure-sensitive adhesive layer including a product made from a polyester-based pressure-sensitive adhesive composition including: a polyester obtained by polycondensation of at least a dicarboxylic acid component and a diol component; and a tackifier, the polyester-based pressure-sensitive adhesive layer having a gel fraction of 15% by weight or more to less than 40% by weight.