Electroless Plating Conductive Patterns Using Reactive Polymers
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Solution Overview
Problem
Current methods for forming conductive patterns in display devices, such as touch screens, face challenges with high costs, limited availability, and inefficiencies due to the use of expensive materials like indium tin oxide (ITO) and complex vacuum deposition processes, which hinder the widespread adoption of cost-effective and reliable electromagnetic shielding solutions.
Innovation Solution
The use of reactive polymers with pendant tertiary alkyl ester groups, exposed to radiation to generate carboxylic acid groups, which then undergo crosslinking and react with metal ions to form electroless seed metal nuclei, allowing for the electroless plating of conductive patterns using less expensive materials and processes like roll-to-roll machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO coatings are used to create conductive patterns for touch screens, then electromagnetic shielding and conductivity are improved, but manufacturing cost and process complexity increase due to expensive vacuum deposition methods
Solution Approach 1:
The patent replaces expensive ITO coatings with inexpensive organic conductive polymers that can be deposited using low-cost roll-to-roll processing. The polymer layers are applied as solution coatings rather than requiring vacuum deposition, dramatically reducing manufacturing equipment costs and process complexity while achieving comparable conductivity.
Solution Approach 2:
The invention changes the material parameter from inorganic oxide (ITO) to organic polymer, and changes the deposition method from physical vapor deposition to solution coating. This parameter change enables the use of simple roll-to-roll machinery instead of expensive vacuum equipment, resolving the contradiction between manufacturing cost and conductivity.
2Reliability
If ITO coatings are used for touch screen conductive patterns, then conductivity is improved, but device flexibility deteriorates because ITO is a ceramic material that is not easily bent or flexed
Solution Approach 1:
The patent changes the material from rigid ceramic ITO to flexible organic polymer, fundamentally altering the mechanical properties while maintaining electrical conductivity. This enables the conductive layers to be bent and flexed without breaking, providing adaptability for flexible display devices.
Solution Approach 2:
The invention uses composite organic conductive polymer materials that combine electrical conductivity with mechanical flexibility. The polymer composition allows the material to exhibit both conductive properties and flexible mechanical behavior, resolving the contradiction between conductivity and flexibility.
3Manufacturing precision
If conventional photolithography and mask materials are used to form conductive patterns, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical photolithography system with a direct-write laser system that uses focused laser beams to selectively remove polymer material. This substitution eliminates the need for complex mask alignments and photolithography equipment, reducing process complexity while maintaining pattern formation precision through direct digital control of the laser writing paths.
Solution Approach 2:
The invention extracts and eliminates the complex photolithography mask and alignment subsystems by using direct laser writing. The pattern is formed directly by programming the laser path, removing the need for separate mask fabrication, alignment, and exposure steps, thereby reducing device complexity while preserving manufacturing precision.
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 method enables the formation of conductive metal patterns with improved cost-effectiveness, reliability, and manufacturing efficiency, reducing the need for expensive materials and complex vacuum processes, while maintaining high conductivity and transparency.
Implementation Method 1
reactive polymers with pendant tertiary alkyl ester groups, exposed to radiation to generate carboxylic acid groups, which then undergo crosslinking
Implementation Method 2
contacting the exposed regions of the polymeric layer with electroless seed metal ions to oxidize the reducing agent in the exposed regions of the polymeric layer and to form corresponding electroless seed metal nuclei
Implementation Method 3
electrolessly plating the corresponding electroless seed metal nuclei in the exposed regions of the polymeric layer with a metal
Data Source
AI summary
A pattern is formed in a polymeric layer comprising (a) a reactive polymer comprising -A- recurring units comprising pendant tertiary alkyl ester groups, (b) a compound that provides an acid upon exposure to radiation having a λmax of 150 nm to 450 nm, and (c) a crosslinking agent that is capable of reacting in the presence of the acid to provide crosslinking in the (a) reactive polymer. The polymeric layer is patternwise exposed to the radiation to provide a polymeric layer comprising exposed regions comprising a polymer comprising carboxylic acid groups. The exposed regions are contacted with a reducing agent to incorporate reducing agent, and then contacted with electroless seed metal ions to oxidize the reducing agent and to form corresponding electroless seed metal nuclei. The electroless seed metal nuclei are then electrolessly plated with a metal to form a conductive metal pattern.