Fluoroalkyl Organopolysiloxane Dielectric Layer for Touch Panels
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Solution Overview
Problem
Current polysiloxane-based materials with fluoroalkyl groups face challenges in achieving high sensor sensitivity due to low compression ratios and adhesive properties, which hinder their application in dielectric layers for touch panels and display devices.
Innovation Solution
A curable organopolysiloxane composition containing a fluoroalkyl group, specifically with 10 mol% or more fluoroalkyl substitution on silicon atoms, an organohydrogen polysiloxane, and a hydrosilylation reaction catalyst, forming an essentially transparent film-shaped or sheet-shaped dielectric layer with high specific permittivity and low pressure-sensitive adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polysiloxane-based gel-like material with high adhesion to substrate is used, then adhesion between substrate and polysiloxane is improved, but compression ratio is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the polysiloxane by incorporating specific fluoroalkyl groups (particularly trifluoropropyl groups) and controlling the ratio of crosslinking agents to base polymers. This compositional parameter change enables the material to achieve both high adhesion strength and high compression ratio simultaneously, resolving the trade-off between these two properties.
2Quantity of substance
If an organopolysiloxane cured product with high specific permittivity is used, then dielectric properties are improved, but compression ratio is insufficient
Solution Approach 1:
The patent creates a composite material system combining multiple polysiloxane components with different functions: a base polysiloxane providing dielectric properties, crosslinking agents providing mechanical strength, and specific fluoroalkyl-containing components providing both high permittivity and compression capability. This composite approach allows simultaneous achievement of high specific permittivity and high compression ratio.
3Reliability
If a polysiloxane-based gel-like material with low compression permanent strain is used, then durability and reliability are improved, but sensor sensitivity is reduced
Solution Approach 1:
The patent optimizes the chemical composition parameters, specifically controlling the content of fluoroalkyl groups (10-50 mol%) and the ratio of crosslinking agents, to achieve a balance between durability and sensitivity. The controlled crosslinking density and specific fluorine-containing structure provide both low compression permanent strain for durability and high electrostatic capacitance for sensor sensitivity.
4Measurement precision
If a polysiloxane-based gel-like material with high electrostatic capacitance is used, then sensor sensitivity is improved, but adhesion properties may increase excessively
Solution Approach 1:
The patent applies local quality by incorporating fluoroalkyl groups at specific positions in the polysiloxane structure and controlling their distribution. This localized modification allows the material to exhibit high electrostatic capacitance in the bulk for sensor sensitivity while maintaining controlled adhesion properties at the substrate interface through specific surface chemistry.
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 dielectric layer with high specific permittivity, high compression ratio, and excellent recovery properties, enabling enhanced sensor sensitivity and pressure responsiveness, suitable for use in touch panels and display devices.
Implementation Method 1
an organopolysiloxane composition containing a fluoroalkyl group, having at least two alkenyl groups with 2 to 12 carbon atoms in a molecule... an organohydrogen polysiloxane having at least two silicon-bonded hydrogen atoms in a molecule... and a hydrosilylation reaction catalyst
Data Source
Figure 1~2
AI summary
To provide a curable composition with a high dielectric constant and favorable transparency, a dielectric layer for a display device, which is a cured product thereof, and a display device. A curable organopolysiloxane composition containing a fluoroalkyl group, containing: (A) an organopolysiloxane containing a fluoroalkyl group, having at least two alkenyl groups in a molecule, where 10 mol% or more of all substitution groups on the silicon atoms is a fluoroalkyl group, and the average degree of polymerization is less than 150; (B) an organohydrogen polysiloxane having at least two silicon-bonded hydrogen atoms in a molecule at an amount where the silicon-bonded hydrogen atoms in the component is 0.1 to 1.0 mol with regard to a total of 1 mol of the alkenyl groups in component (A); (C) an effective amount of a hydrosilylation reaction catalyst; and optionally, (D) a solvent, as well as a cured product thereof and application thereof