Adhesive Resin Composition for Touch Panel Holding Force
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Solution Overview
Problem
The existing (meth)acrylic copolymer-based adhesive compositions for touch panels face challenges in achieving high holding force, wet heat clouding resistance, and low corrosiveness, particularly when exposed to high-temperature and high-humidity environments.
Innovation Solution
An adhesive resin composition incorporating a (meth)acrylic copolymer with specific structural units, including a macromonomer and a vinyl monomer, which contains an amide bond and a radical polymerizable group, with a weight average molecular weight of 1,000 to 1,000,000 and an ethylenic unsaturated bond equivalent of 3,000 to 150,000 g/mol, to form a graft or block copolymer structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional (meth)acrylic copolymer is used for the adhesive layer, then the adhesive composition can be manufactured with standard materials, but the adhesive layer exhibits insufficient holding force and poor wet heat clouding resistance
Solution Approach 1:
The patent employs a composite adhesive system combining (meth)acrylic copolymer with specific macromonomer units (500-6000 Da) and vinyl monomer units, crosslinked with diamine crosslinking agents. This composite material approach achieves superior holding force and wet heat clouding resistance by integrating multiple functional components that work synergistically, rather than relying on a single polymer type.
Solution Approach 2:
The patent specifies precise parameter ranges for the macromonomer (molecular weight 500-6000 Da, specific functional groups) and controls the crosslinking degree through selected diamine agents. These parameter optimizations enable the adhesive layer to achieve both high holding force and resistance to wet heat clouding, transforming standard materials into a high-performance system through controlled chemical composition and structure.
2Strength
If the adhesive layer is designed to have high holding force, then bonding strength improves, but the adhesive layer becomes more prone to clouding in high-temperature and high-humidity environments
Solution Approach 1:
The patent introduces specific macromonomer units with molecular weights of 500-6000 Da containing hydroxyl, carboxyl, or amide groups at controlled proportions within the adhesive copolymer. These localized functional units provide both strong bonding capability (holding force) and resistance to wet heat-induced clouding, allowing different regions of the adhesive layer to perform specialized functions while maintaining overall transparency.
3Strength
If a crosslinking agent is added to enhance adhesive performance, then holding force improves, but corrosiveness to transparent electrodes increases
Solution Approach 1:
The patent carefully selects diamine crosslinking agents and controls the crosslinking degree to achieve optimal performance. By adjusting the crosslinking parameters and selecting appropriate diamine agents with suitable molecular structures, the adhesive achieves high holding force while minimizing corrosiveness to transparent electrodes, balancing performance and material compatibility.
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 forms an adhesive layer with enhanced holding force, wet heat clouding resistance, and low corrosiveness, suitable for transparent applications like touch panels, maintaining transparency and preventing substrate corrosion.
Implementation Method 1
a (meth)acrylic copolymer (A) having a constituent unit derived from a macromonomer (a) having two or more constituent units represented by the following formula (a′) and a constituent unit derived from a vinyl monomer (b), in which the (meth)acrylic copolymer (A) has at least one of an amide bond and a radical polymerizable group
Data Source
AI summary
Provided are an adhesive resin composition capable of forming an adhesive layer excellent in holding force, wet heat clouding resistance, and low corrosiveness; and an adhesive sheet. The adhesive resin composition includes a (meth)acrylic copolymer (A) having a constituent unit derived from a macromonomer (a) and a constituent unit derived from a vinyl monomer (b), in which the (meth)acrylic copolymer (A) has at least one of an amide bond and a radical polymerizable group.