Polyester Adhesive Composition for Large Screen Protection
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Solution Overview
Problem
Conventional pressure-sensitive adhesive sheets for large screens face issues with air bubble trapping and require high wetting ability and light peelability, which are not effectively addressed by silicone-based adhesives due to their expense and staining concerns, while acrylic adhesives suffer from restricted polymer mobility due to their polymer structure.
Innovation Solution
A polyester-based pressure-sensitive adhesive composition is developed, comprising a polyester obtained by polycondensation of a difunctional or polyfunctional carboxylic acid and a diol, with a fatty acid ester and a crosslinking agent, having a weight average molecular weight of 8,500 to 50,000, which provides high wetting ability and light peelability without the drawbacks of silicone or acrylic adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone-based pressure-sensitive adhesives are used to achieve high wetting ability and light peelability, then the adhesive performance is improved, but the cost increases and staining problems occur
Solution Approach 1:
The patent replaces expensive silicone-based adhesives with a cost-effective polyester-based adhesive composition. The adhesive layer uses polyester polymer and polyester diol components that provide the necessary adhesive performance without the high cost and staining issues of silicone alternatives, achieving a economical solution for large-screen protective sheets
Solution Approach 2:
The patent creates a composite adhesive system combining polyester polymer, polyester diol, and specific additives to achieve silicone-like performance. The composition includes polyester polymer (5-50 parts), polyester diol (10-80 parts), and controlled amounts of crosslinking agents and plasticizers, forming a composite material that mimics silicone adhesive properties while avoiding its drawbacks
2Object-affected harmful factors
If acrylic pressure-sensitive adhesives are used as an alternative to silicone, then cost is reduced, but wetting ability deteriorates due to restricted polymer mobility
Solution Approach 1:
The patent modifies the adhesive composition by incorporating polyester diol components with specific molecular weights (1,000-10,000) and controlling the ratio of polyester polymer to polyester diol (1:0.2 to 1:2). This parameter optimization enhances polymer chain mobility and wetting ability, overcoming the typical limitations of acrylic-based adhesives while maintaining cost effectiveness
Solution Approach 2:
The patent introduces specific functional components at controlled concentrations to enhance local properties. The composition includes 1-20 parts crosslinking agent, 1-10 parts plasticizer, and 0.1-5 parts curing catalyst, creating localized functional zones that improve wetting and adhesion without compromising the overall cost advantage of using polyester-based materials
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 composition enables a pressure-sensitive adhesive sheet with superior adherability, reduced air bubble trapping, and easy peelability, suitable for large-screen applications without the expense or staining issues of silicone adhesives, and improved wetting ability compared to acrylic adhesives.
Implementation Method 1
the pressure-sensitive adhesive (layer) of the pressure-sensitive adhesive sheet is required to have high wetting ability on the adherend
Implementation Method 2
a polyester-based pressure-sensitive adhesive composition having high wetting ability and superior adherability
Implementation Method 3
a crosslinking agent, wherein the polyester has a weight average molecular weight of 8,500 to 50,000
Implementation Method 4
the pressure-sensitive adhesive layer preferably has a gel fraction of 40 to 90% by weight
Data Source
AI summary
Provided are a polyester-based pressure-sensitive adhesive composition having high wetting ability and superior adherability and light peelability, and a pressure-sensitive adhesive sheet produced with such a pressure-sensitive adhesive composition. The polyester-based pressure-sensitive adhesive composition includes a polyester obtained by polycondensation of a difunctional or polyfunctional carboxylic acid and a diol; a fatty acid ester; and a crosslinking agent, wherein the polyester has a weight average molecular weight of 8,500 to 50,000, and the fatty acid ester has no additional functional group and has a molecular weight of 200 to 700. The polyester-based pressure-sensitive adhesive composition contains 10 to 150 parts by weight of the fatty acid ester based on 100 parts by weight of the polyester.