Metal Plating Composition for Uniform Hole Filling
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Solution Overview
Problem
Metal plating processes face challenges in achieving uniform metal distribution, particularly in small-diameter holes of printed wiring boards, leading to potential mechanical and thermal failures due to insufficient metal layer thickness, which affects the reliability of electronic components.
Innovation Solution
The use of specific water-soluble compounds with a general formula H-A′p-Q-[C(O)—CH2O—((R1CH)t—O)z—CH2—C(O)—NH-A]u—H, where A′, A, R1, Q, p, r′, w′, x′, y′, r, w, x, y, t, u, and z are defined integers, is incorporated into metal plating compositions to enhance leveling and throwing power, ensuring uniform metal deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plating formulations are used, then the plating process is simple, but the metal layer thickness is non-uniform particularly in small-diameter holes
Solution Approach 1:
The patent modifies the chemical parameters of the plating formulation by incorporating specific compounds (polyamidoamines, ethoxylated dicarboxylic acids, ethoxylated diamines) with controlled molecular weights and functional groups. These parameter changes in the formulation chemistry enable improved metal ion transport into small-diameter holes while maintaining uniform deposition across the substrate surface.
Solution Approach 2:
The invention uses composite plating formulations that combine multiple functional components: levelers (polyamidoamines), brighteners (ethoxylated dicarboxylic acids), and carriers (ethoxylated diamines). This composite approach allows each component to perform its specific function synergistically, achieving uniform metal distribution in complex geometries including small-diameter holes while maintaining processability.
2Strength
If metal layer thickness is increased to prevent tearing, then mechanical strength is improved, but the plating uniformity deteriorates with smaller hole diameters
Solution Approach 1:
The patent applies local quality by using plating formulation components that selectively interact with different regions of the substrate. The levelers and brighteners in the formulation create locally optimized deposition conditions: they suppress excessive deposition on flat surfaces while promoting adequate filling of small-diameter holes and vias. This local differentiation enables achieving sufficient thickness in critical areas without compromising overall uniformity.
Solution Approach 2:
The invention introduces intermediary compounds (polyamidoamines, ethoxylated dicarboxylic acids) that act as mediators between the metal ions and the substrate surface. These intermediaries adsorb preferentially on certain surface features, modifying local electrochemical conditions to promote uniform current distribution. This mediation effect ensures adequate metal deposition in small holes while preventing excessive buildup on surfaces, thereby achieving both strength and uniformity.
3Manufacturing precision
If conventional levelers are used (e.g., transformation products from epihalohydrins), then some leveling performance is achieved, but throwing power and overall plating performance remain insufficient
Solution Approach 1:
The patent changes the chemical parameters of conventional levelers by using polyamidoamines with specific molecular weight ranges (500-10,000) and controlled degrees of ethoxylation. These parameter modifications enhance not only leveling performance but also throwing power and thermal stability of the metal deposit. The specific structural parameters (amino group content, molecular weight) are optimized to achieve multiple performance targets simultaneously.
Solution Approach 2:
The invention replaces single-function conventional levelers with composite formulations containing multiple synergistic components: polyamidoamines for leveling and adhesion, ethoxylated dicarboxylic acids for brightness and throw, and ethoxylated diamines for carrier functions. This composite approach enhances overall plating performance including thermal reliability, which cannot be achieved with conventional single-component levelers alone.
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
These compounds improve the uniformity and thickness of metal layers in small-diameter holes, enhancing the thermal reliability and performance of metal-plated electronic components by optimizing the metal plating process.
Implementation Method 1
metal plating compositions and methods which provide improved leveling and throwing power
Data Source
AI summary
Disclosed are metal plating compositions and methods. The metal plating compositions provide good leveling performance and throwing power.