Silver Carboxylate-Phosphite Complex for Uniform Conductive Patterns
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Solution Overview
Problem
Current methods for producing electrically-conductive films, particularly for touch screen displays, face challenges with the use of Indium Tin Oxide (ITO) due to its high cost, limited availability, and requirement for high processing temperatures, while also struggling with the dispersion of silver particles in photocurable compositions for electroless plating, leading to non-uniform and inefficient conductive patterns.
Innovation Solution
A non-aqueous metal catalytic composition comprising a silver carboxylate-trialkyl(triaryl)phosphite complex with reducible silver ions and a silver ion photoreducing composition, which generates silver particles in situ during photocuring, eliminating the need for pre-dispersion of silver particles and simplifying the process for high-speed production of uniform electrically-conductive patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silver particles are pre-dispersed in photocurable compositions, then conductive patterns can be formed, but the dispersion is non-uniform and requires expensive dispersants
Solution Approach 1:
The patent applies preliminary action by pre-complexing silver ions with ligands (such as PVP, PEG, or carboxylic acids) before the electroless plating process. This pre-complexation stabilizes the silver ions in solution, preventing premature precipitation and ensuring uniform distribution during the plating process, thereby eliminating the need for expensive dispersants and complex dispersion procedures.
Solution Approach 2:
The patent uses ligands as intermediary substances that mediate between silver ions and the photocurable composition. These ligands (PVP, PEG, carboxylic acids) act as intermediaries that stabilize silver ions, control their reduction, and ensure uniform distribution throughout the composition without requiring complex mechanical dispersion processes.
2Reliability
If ITO is used for conductive films, then conductivity is achieved, but processing requires high temperatures and vacuum deposition
Solution Approach 1:
The patent replaces the mechanical/physical vacuum deposition process with a chemical solution-based electroless plating process. Instead of using vacuum deposition equipment to deposit ITO, the invention uses chemical reduction of silver ions in a photocurable composition, which can be processed at lower temperatures and without vacuum equipment, while achieving comparable or superior conductivity.
Solution Approach 2:
The patent changes the processing parameters from high-temperature vacuum deposition to lower-temperature chemical reduction. By adjusting parameters such as silver ion concentration, ligand type, and photoinitiator selection, the process achieves conductive film formation at significantly lower temperatures without requiring vacuum conditions.
3Manufacturing precision
If silver halide emulsions are used to form conductive films, then silver patterns can be created, but the process is complex and requires optimization of emulsion and processing conditions
Solution Approach 1:
The patent extracts and eliminates the complex silver halide emulsion system from the process. Instead of using silver halide emulsions that require careful optimization of emulsion composition, coating conditions, and processing chemistry, the invention directly uses silver ion complexes in photocurable compositions that can be applied and processed more simply while achieving comparable pattern precision.
Solution Approach 2:
The patent creates a composite system combining silver ion complexes with photocurable polymers. This composite material integrates the conductive silver precursor with the structural matrix in a single composition, simplifying the manufacturing process compared to separate silver halide emulsion layers and processing steps.
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
This approach allows for the production of uniform electrically-conductive patterns with improved conductivity and reduced processing complexity, enabling high-speed manufacturing of touch screen displays without the need for expensive dispersants and high processing temperatures, while ensuring stability and solubility of silver complexes.
Implementation Method 1
reducing a silver halide image in silver halide emulsions in the form of electrically-conductive grid networks
Implementation Method 2
a photocurable component or non-curable polymer
Data Source
AI summary
A non-aqueous metal catalytic composition includes (a) a silver carboxylate-trialkyl(triaryl)phosphite complex comprising reducible silver ions in an amount of at least 2 weight %, (b) a silver ion photoreducing composition in an amount of at least 1 weight %, and (c) a photocurable component or a non-curable polymer or a combination of a photocurable component and a non-curable polymer. This non-aqueous metal catalytic composition can be used to form silver metal particles in situ during suitable reducing conditions. The silver metal can be provided in a suitable layer or pattern on a substrate, which can then be subsequently subjected to electroless plating to form electrically-conductive layers or patterns for use in various articles or as touch screen displays in electronic devices.