Conductive Sheet Gelatin Removal for Ion Migration
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Solution Overview
Problem
The existing methods for forming conductive sheets, such as those used in touch panels, face challenges with ion migration, leading to conduction issues due to narrowed wiring intervals, and existing solutions like cross-linking with enzymes or enzyme-containing treatment solutions do not provide sufficient inhibition of ion migration.
Innovation Solution
A manufacturing method involving the formation of a silver halide-containing photosensitive layer with a specific mass ratio of polymer to gelatin, followed by exposure, development, and treatment with an oxidant having a standard electrode potential of +1.5 V or higher, such as hydrogen peroxide or sodium hypochlorite, to decompose and remove gelatin, thereby inhibiting ion migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the wiring interval is narrowed to achieve miniaturization and higher performance, then the circuit conduction becomes more prone to ion migration, but reducing the wiring interval is necessary for product miniaturization
Solution Approach 1:
The patent extracts and removes gelatin from the photosensitive layer through oxidation treatment after silver wire formation. By selectively removing the gelatin component while preserving the silver conductive wires and polymer matrix, the invention eliminates the source of ion migration without affecting the conductive structure, thus resolving the contradiction between miniaturization and ion migration resistance
Solution Approach 2:
The patent changes the chemical composition parameters of the photosensitive layer by controlling the oxidation process. Through adjusting oxidant concentration, treatment time, and temperature, the gelatin is decomposed and removed while maintaining the structural integrity of silver wires and polymer, thereby improving ion migration resistance in narrowed wiring configurations
2Reliability
If cross-linking treatment is applied to gelatin to prevent ion migration, then ion migration is partially inhibited, but the effect is insufficient when wiring intervals are narrowly spaced
Solution Approach 1:
Instead of cross-linking gelatin to prevent ion migration, the patent inverts the approach by completely removing gelatin through oxidation treatment. This eliminates the need for complex cross-linking processes and provides superior ion migration resistance, especially in narrowly spaced wiring configurations where cross-linking proves insufficient
3Reliability
If enzyme-containing treatment solution is used to decompose gelatin, then gelatin decomposition is achieved, but the effect is insufficient for preventing ion migration in narrowed wiring
Solution Approach 1:
The patent employs strong oxidants such as hydrogen peroxide, sodium hypochlorite, or potassium permanganate to rapidly and completely decompose gelatin. This accelerated oxidation method achieves more thorough gelatin removal compared to enzyme treatment, providing superior ion migration resistance while maintaining efficient processing suitable for industrial production
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 method effectively inhibits ion migration between conductive portions, ensuring reliable circuit function even with narrowed wiring intervals, and improves the conductivity and durability of the conductive sheets.
Implementation Method 1
a step C of treating the support having the conductive portions with an oxidant which has a standard electrode potential of equal to or greater than +1.5 V and decomposes the gelatin
Implementation Method 2
a step B of forming conductive portions containing metal silver by performing exposure and then development treatment on the silver halide-containing photosensitive layer
Data Source
AI summary
A manufacturing method of a conductive sheet includes: a step A of forming a silver halide-containing photosensitive layer, which contains silver halide, gelatin, and a polymer different from the gelatin and in which a mass ratio (Y/X) of a mass Y of the polymer to a mass X of the gelatin is equal to or greater than 0.1, on a support; a step B of forming conductive portions containing metal silver by performing exposure and then development treatment on the silver halide-containing photosensitive layer; and a step C of treating the support having the conductive portions with an oxidant which has a standard electrode potential of equal to or greater than +1.5 V and decomposes the gelatin.