Catalyzed Metal Foil for Circuit Patterning
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Solution Overview
Problem
Current methods for manufacturing conductive patterns in electric circuits face challenges such as material durability, complexity, and cost-effectiveness, particularly with the use of mylar films and existing electroless plating techniques, which are limited by temperature stability and require cumbersome soaking processes.
Innovation Solution
The use of catalyzed metal foils with a catalyst material, such as Ag, Au, or Pd, applied to a substrate via a laminated and etchable metal foil, allowing for efficient electroless plating and subsequent conductor deposition, with optional coatings for enhanced adhesion and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pre-soaked mylar films are used for catalyst transfer, then the catalyst transfer process is simplified, but the material decomposes over time and has poor shelf stability
Solution Approach 1:
The invention separates the catalyst application step from the mylar film preparation step. The mylar film is first coated with a catalyst precursor (not active catalyst), then the actual catalyst is applied to the substrate during the lamination process. This segmentation allows the mylar to be prepared in advance without decomposing, while still achieving catalyst transfer when needed.
Solution Approach 2:
The mylar film is pre-coated with catalyst precursor in a stable form during manufacturing, allowing it to be stored and shipped without decomposition. The actual catalyst activation and transfer occurs preliminarily prepared but only becomes active during the lamination process with the substrate, combining advance preparation with on-demand activation.
2Ease of manufacture
If mylar film is used for catalyst transfer, then the process is simpler, but it cannot withstand temperatures of 150°C or higher
Solution Approach 1:
The invention changes the chemical state of the catalyst on the mylar film from inactive precursor to active catalyst during the lamination process. This parameter change allows the catalyst to be activated only when needed at the substrate interface, enabling the use of mylar for high-temperature applications since the catalyst doesn't need to be active during storage and handling.
3Manufacturing precision
If users soak mylar in catalyst solution, then catalyst transfer is achieved, but the process becomes unnecessarily complicated
Solution Approach 1:
The invention merges the catalyst application step with the lamination process itself. The catalyst precursor is already on the mylar film during manufacturing, and the lamination action simultaneously transfers both the mylar coating and the catalyst precursor to the substrate, where it is then activated. This combines multiple steps into one, eliminating the need for separate soaking operations.
4Manufacturing precision
If electroless plating is used for conductor deposition, then conductive patterns are formed, but the process requires additional steps and time
Solution Approach 1:
The mylar film is pre-coated with catalyst precursor during manufacturing, and this precursor is transferred to the substrate during lamination. This preliminary preparation of the catalyst layer eliminates the need for separate catalyst application steps before electroless plating, streamlining the overall process while maintaining the precision of conductor pattern formation.
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 simplifies and cost-effectively patterns catalysts onto substrates, improving durability and efficiency in forming electrical circuits while overcoming the limitations of existing materials and processes.
Implementation Method 1
A metal foil has a bottom surface with a catalyst material disposed on at least part of the bottom surface of the metal foil
Implementation Method 2
that part of the bottom surface typically roughened, for example via etching or dendrite growth, or in some embodiments oxidized
Implementation Method 3
The metal foil is etchable or otherwise removable
Data Source
AI summary
Systems, methods, and devices related to catalyzed metal foils are disclosed. Contemplated metal foils have a bottom surface, preferably roughened to Ra of at least 0.1 μm, bearing a catalyst material. The metal foils are etchable, typically of aluminum or derivative thereof, and is less than 500 μm thick. Methods and systems for forming circuits from catalyzed metal foils are also disclosed. The catalyst material bearing surface of the metal foil is applied to a substrate and laminated, in some embodiments with a thermoset resin or thermoplastic resin therebetween or an organic material first coating the catalytic material. The metal foil is removed to expose the catalyst material, and a conductor is plated to the catalyst material.