Thiosulfate Copolymer for Conductive Metal Patterns
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Solution Overview
Problem
Current technologies for forming conductive patterns in display devices, such as touch screens, face challenges with high costs, limited availability of materials, and the need for expensive vacuum deposition methods, particularly due to the use of indium tin oxide (ITO) coatings, which are costly and not easily bendable.
Innovation Solution
A method using a water-soluble thiosulfate copolymer that can be crosslinked with UV radiation, allowing for the formation of fine conductive metal lines through electroless plating, eliminating the need for traditional semiconductor fabrication methods and enabling the use of aqueous-based processing solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO coatings are used for conductive patterns, then electromagnetic shielding and touch screen functionality are achieved, but costs increase and material availability is limited
Solution Approach 1:
The patent replaces expensive, rare earth ITO materials with inexpensive, abundant metals such as copper, nickel, or cobalt that can be deposited via electroless plating. These alternative materials are significantly more available and cost-effective while providing comparable or superior electrical conductivity for conductive patterns in display devices
Solution Approach 2:
The invention changes the material composition parameters by transitioning from oxide-based ITO coatings to pure metal deposits. This parameter change enables the use of metals with higher electrical conductivity and better ductility, resolving the contradiction between performance reliability and material availability
2Reliability
If ITO coatings are used for conductive patterns, then electromagnetic shielding is provided, but the coatings are not easily bendable and require expensive vacuum deposition
Solution Approach 1:
The patent replaces the vacuum deposition mechanical system with a chemical electroless plating system. This substitution eliminates the need for expensive vacuum equipment and complex deposition processes, allowing conductive patterns to be formed through chemical reactions in solution, thereby improving ease of manufacture while maintaining conductive performance
Solution Approach 2:
The invention creates a multi-functional polymer coating system that combines pattern formation, metal ion complexing, and crosslinking capabilities in a single material platform. The thiosulfate copolymer performs multiple functions: serving as a pattern-defining layer, a metal ion complexing agent, and a crosslinkable matrix, thereby simplifying the overall manufacturing process
3Manufacturing precision
If traditional semiconductor fabrication methods are used, then precise conductive patterns can be formed, but the process is complex and costly
Solution Approach 1:
The patent merges multiple traditional fabrication steps into a single integrated process. The thiosulfate copolymer simultaneously provides pattern definition through UV crosslinking, metal ion complexing for electroless plating initiation, and structural support. This consolidation reduces fabrication process complexity while maintaining manufacturing precision through the polymer's inherent photopatterning capabilities
Solution Approach 2:
The thiosulfate copolymer acts as an intermediary material that bridges the gap between photolithographic patterning and electroless metal deposition. It contains thiosulfate groups that complex metal ions and initiate electroless plating only in exposed regions, enabling precise pattern transfer without requiring complex semiconductor fabrication equipment or processes
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 reduces costs and improves the reliability of conductive patterns by using a water-soluble copolymer that can be processed with UV radiation, enabling the creation of high-conductivity metal lines with low resistivity, suitable for various display devices without the limitations of ITO coatings.
Implementation Method 1
water-soluble thiosulfate reactive polymers that can be crosslinked upon suitable irradiation
Implementation Method 2
forming other material patterns such as conductive metallic patterns, for example using electroless plating
Data Source
AI summary
A precursor article has a substrate and a polymeric layer having a reactive composition that contains a non-crosslinked thiosulfate copolymer comprising: (a) recurring units comprising pendant thiosulfate groups, and (b) recurring units comprising pendant carboxy, carboxylate, phospho, phosphonate, phosphate, sulfo, sulfonate, or sulfite groups. The (a) recurring units are present in an amount of 1 to 30 mol %, and the (b) recurring units are present in an amount of 70 to 99 mol %. This precursor article can be used to provide a product article comprising a substrate in which the polymeric layer has both exposed regions and non-exposed regions. The exposed regions contain a pattern of electrolessly plated metal within or deposited on the surface of an at least partially crosslinked polymer that has been derived from the non-crosslinked thiosulfate copolymer. The non-exposed regions have none of the electrolessly plated metal or the non-crosslinked thiosulfate polymer.