Elastomeric Relief Element Acid Treatment for Conductive Ink Transfer
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Solution Overview
Problem
Current methods for forming high-resolution conductive patterns using relief images are limited in achieving consistent and uniform patterns with feature sizes of 10 μm or less, and there is a need for improved conductivity and efficient transfer of conductive inks in microelectronic device fabrication.
Innovation Solution
A method involving an elastomeric relief element with a relief pattern of at least 50 μm depth, treated with acid vapor or liquid, and a printable material composition with a high viscosity, where the carrier liquid is removed and the conductive ink is treated with acid to enhance conductivity and transfer efficiency to a receiver element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithographic processes are used to form conductive patterns, then manufacturing precision can be achieved, but device complexity and production cost increase significantly
Solution Approach 1:
The patent replaces the complex photolithographic mechanical system with a simpler microcontact printing system. Instead of using photomasks, aligners, and multiple chemical development steps, the invention uses a relief element with micrometer-scale features that directly transfers conductive material through physical contact, achieving comparable precision with far fewer process steps
Solution Approach 2:
The patent creates a physical copy of the desired pattern in the form of a relief element. The relief element contains a positive relief pattern that is directly copied onto the substrate through contact printing, eliminating the need for photolithographic masking and chemical processing while maintaining pattern fidelity
2Manufacturing precision
If SAM printing is used to form high resolution metal patterns, then manufacturing precision improves, but the method is limited to specific metals like gold or silver
Solution Approach 1:
The patent makes the microcontact printing system universal by using a conductive paste composition that can be electrolessly plated to form various metals. Instead of being limited to thiol-based SAM chemistry for gold or silver, the system uses a versatile conductive paste with metal particles and organic vehicle that can be transferred and plated to create patterns of different metals including copper, aluminum, and other conductive materials
Solution Approach 2:
The patent introduces a conductive paste composition as an intermediary between the relief element and the final metal pattern. The paste contains metal particles suspended in an organic vehicle that transfers to the substrate, and subsequent electroless plating builds up the final metal structure. This intermediary approach enables versatile material selection while maintaining high-resolution patterning
3Productivity
If flexographic printing is used for high-volume printing runs, then productivity increases, but manufacturing precision for fine wiring decreases
Solution Approach 1:
The patent segments the printing system into distinct functional components: a relief element for pattern definition, a conductive paste composition for material transfer, and an electroless plating step for final metal formation. This segmentation allows each component to be optimized independently - the relief element for high-speed contact printing and the plating step for precise metal deposition - achieving both productivity and fine wiring resolution
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 high-resolution, uniform conductive patterns with improved conductivity and efficient transfer of electrically conductive materials, suitable for applications in microelectronic devices such as touch screen panels and RFID tags.
Implementation Method 1
the conductive ink is treated with acid to enhance conductivity and transfer efficiency
Implementation Method 2
removing at least 50 weight % of the carrier liquid from the printable material composition that is disposed on the uppermost relief surface
Data Source
AI summary
A pattern of an electrically conductive print material is formed on a receiver element using an elastomeric relief element that has a relief pattern comprising (1) an uppermost relief surface, and (2) an average relief image depth of at least 50 μm relative to the uppermost relief surface. A printable material composition is applied to the uppermost relief surface, which printable material composition contains an electrically conductive print material and a carrier liquid. At least 50 weight % of the carrier liquid is removed from the uppermost relief surface, leaving the electrically conductive print material on the uppermost relief surface. Either the elastomeric relief element or the printable material composition on the elastomeric relief element, or both, are treated with an acid in vapor or liquid form to improve conductivity of the electrically conductive print material after it has been transferred from the uppermost relief surface to the receiver element.