Protective Film Composition for Touch Panel Electrodes
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Solution Overview
Problem
Existing methods for forming protective films for touch panel electrodes lack sufficient hydrothermal resistance after salt water application, particularly in suppressing corrosion of copper wiring, and existing insulating layers and protective layers do not provide adequate moisture resistance.
Innovation Solution
A composition comprising a compound represented by Formula 1, a binder polymer, and a photopolymerization initiator is used to form a protective film, where the compound has a specific I/O value and is incorporated in a range of 50% to 90% by mass, along with a photopolymerization initiator, to enhance the hydrothermal resistance and adhesiveness of the protective film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional transparent resin layers are formed on touch panel electrodes, then the refractive index is increased to lower electrode visibility, but the hydrothermal resistance after salt water application is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the resin layer by incorporating specific compounds (Formula 1) with controlled I/O values and using particular binder polymers and photopolymerization initiators. This compositional parameter change achieves both the desired refractive index (1.40-1.70) and excellent hydrothermal resistance after salt water application, resolving the contradiction between optical properties and environmental durability.
Solution Approach 2:
The patent creates a composite resin composition by combining multiple components: Compound A (Formula 1) at 50-90% by mass, binder polymers (acrylic, vinyl, or polyurethane), and photopolymerization initiators. This composite material approach allows simultaneous optimization of refractive index for electrode concealment and hydrothermal resistance for corrosion protection, achieving both improving and worsening features together.
2Object-generated harmful factors
If existing insulating layers are used for copper wiring protection, then basic insulation is provided, but the resistance to corrosion after salt water application is insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the protective layer by using Compound A (Formula 1) with specific I/O values (0.3-0.7 preferably) and controlling the composition ratios of binder polymers and photopolymerization initiators. These parameter changes create a protective layer that maintains basic insulation while providing superior resistance to salt water-induced corrosion and hydrothermal degradation.
Solution Approach 2:
The patent develops a composite protective composition combining Compound A (Formula 1) with specific binder polymers (acrylic, vinyl, or polyurethane) and photopolymerization initiators. This composite structure provides both the insulating function for copper wiring protection and enhanced hydrothermal resistance, simultaneously addressing corrosion protection needs and reliability requirements in humid environments.
3Reliability
If polymerizable functional groups or polymerization initiators are added to improve moist heat resistance, then some resistance is achieved, but sufficient effects are not obtained
Solution Approach 1:
The patent optimizes the parameters of the photopolymerization initiator system by selecting specific initiators and controlling their concentration (0.1-10% by mass). Combined with the specific I/O value range of Compound A (0.3-0.7) and the type of binder polymer used, these parameter changes achieve sufficient crosslinking density and moisture resistance without requiring overly complex multi-initiator systems or excessive additive combinations.
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 effectively provides a protective film with excellent hydrothermal resistance and adhesiveness, reducing the visibility of the transparent electrode pattern and preventing corrosion of metal wiring, thereby improving the durability and performance of touch panel electrodes.
Implementation Method 1
a photopolymerization initiator as Component C
Data Source
AI summary
The composition includes a compound represented by Formula 1, a binder polymer, and a photopolymerization initiator, in Formula 1, Q1 and Q2 each independently represent a (meth)acryloyloxy group or a (meth)acryloyloxyalkyl group; and R1 represents a divalent hydrocarbon group.Q2-R1-Q1 (1)