Metal Coating on Paper via Polymer Chelation
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Solution Overview
Problem
Existing methods for applying metal coatings on paper face challenges in achieving satisfactory adhesion and are not economical for large-scale production, often requiring excessive metal usage and generating chemical waste.
Innovation Solution
A method involving plasma treatment, application of a primer, and deposition of polymers with carboxylic groups and metal ions at elevated pH, followed by reduction and deposition of a first metal, allowing for improved adhesion and reduced chemical usage, enabling the production of circuits with better signal integrity and smaller line widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal coating methods are used on paper, then metal adhesion is improved, but the process is not economical for large-scale production and generates excessive chemical waste
Solution Approach 1:
The patent changes the pH parameter from acidic (traditional method) to basic (pH 8-11), which fundamentally alters the chemistry of metal ion adsorption onto the polymer coating. This parameter change enables excellent metal adhesion while using simpler, more economical processes suitable for large-scale production, and reduces chemical waste generation.
2Area of stationary object
If thick metal layers are applied to ensure coverage, then surface coverage is improved, but metal waste increases due to excessive material usage
Solution Approach 1:
The patent applies a polymer coating with carboxylic groups to the paper surface before metal deposition. This preliminary action creates a functional layer that actively binds metal ions, ensuring uniform distribution and efficient use of metal material. This prevents the need to apply excessive thick metal layers, thereby reducing metal waste while achieving complete surface coverage.
3Ease of manufacture
If conventional metal deposition methods are used, then manufacturing simplicity is maintained, but adhesion strength is insufficient
Solution Approach 1:
The patent introduces a polymer coating with carboxylic groups as an intermediary layer between the paper substrate and the metal coating. This intermediary layer actively chelates metal ions through its carboxylic groups, providing strong adhesion. The method remains simple because the polymer coating is applied once and then metal ions are deposited in a basic solution, avoiding complex multi-step processes while achieving excellent adhesion strength.
4Quantity of substance
If acidic conditions are used for metal ion adsorption, then metal deposition is achieved, but chemical waste and environmental concerns increase
Solution Approach 1:
The patent inverts the traditional approach by using basic conditions (pH 8-11) instead of acidic conditions for metal ion adsorption. In basic conditions, metal ions form insoluble hydroxides that deposit onto the polymer-coated surface. This inversion eliminates the need for acidic chemicals and their associated waste treatment, while still achieving effective metal deposition.
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
The method achieves excellent adhesion of metal coatings on paper, reduces metal waste, and allows for the production of circuits with improved high-frequency properties and smaller line widths, suitable for large-scale production using existing equipment.
Implementation Method 1
producing polymers on the surface of said paper, said polymers comprising carboxylic groups and adsorbed ions of at least one second metal
Implementation Method 2
The present invention relates to a method for applying a first metal on paper
Data Source
AI summary
There is disclosed a method for applying a first metal on paper, which method comprises the steps a) producing polymers on the surface of said paper, said polymers comprising carboxylic groups and adsorbed ions of at least one second metal, said ions being adsorbed at a pH above 7, b) reducing said ions to the second metal and c) depositing said first metal on the reduced ions of said second metal. The invention further comprises objects manufactured according to the method. Advantages of the present invention include improved adhesion of the metal coating, possibility to coat many difficult materials. The process is suitable for large-scale and continuous production and it will reduce the waste of metal. Circuits manufactured according to the invention display improved signal integrity. Also there is the possibility to manufacture circuits which are built up sequentially with several layers of conductors in distinct patterns. It is also possible to manufacture of circuits with a very small line width.