Organic Solderability Preservative Using High Boiling Point Alcohol
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Solution Overview
Problem
Aqueous-based organic solderability preservative (OSP) compositions face issues with the solubility of azole compounds due to their low miscibility with water, leading to crystallization and reduced effectiveness in forming protective coatings on copper substrates during soldering processes.
Innovation Solution
Incorporating a high boiling point, low volatility alkyl cyclic alcohol or monohydric alcohol with a boiling point of at least 150°C, which enhances the solubility and stability of azole compounds, preventing crystallization and maintaining the concentration of the azole component in the OSP composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If lower alkyl alcohols are used to solubilize azole compounds during OSP composition preparation, then the azole compounds become soluble in the composition, but the alcohols evaporate over time rendering the azole compounds less soluble and causing crystallization
Solution Approach 1:
The patent changes the key parameter of alcohol boiling point from low (3-7 carbons) to high (10 or more carbons). This parameter change fundamentally alters the volatility characteristics, preventing evaporation during storage and transport while maintaining solubilization capability for azole compounds in the OSP composition.
Solution Approach 2:
The patent replaces volatile, short-lived solubilizing alcohols with stable, long-lived high boiling point alcohols. The high boiling point alcohol provides sustained solubilization without evaporating away, eliminating the need for frequent composition replenishment and maintaining consistent azole compound solubility over extended periods.
2Reliability
If azole compounds with bulky 2-alkyl and 2-aryl substituents are used in OSP composition, then the protective coating properties are enhanced, but the miscibility with water decreases leading to preparation difficulties
Solution Approach 1:
The patent introduces high boiling point alcohol as an intermediary substance that mediates between the hydrophobic azole compound and the aqueous environment. This intermediary provides a hydrophobic domain for the bulky azole compound while maintaining overall composition miscibility, enabling both effective protective coating formation and ease of composition preparation.
Solution Approach 2:
The patent creates a composite OSP composition system combining water, high boiling point alcohol, and azole compound. This composite structure leverages the hydrophilic nature of water and alcohol while accommodating the hydrophobic bulky azole substituents, achieving both manufacturability and reliable protective coating performance.
3Duration of action of stationary object
If OSP composition is stored for extended periods, then the composition remains available for use, but the azole compounds crystallize and deposit on tool parts and treated PWBs
Solution Approach 1:
The patent changes the volatility parameter of the alcohol component by selecting high boiling point alcohols (10 or more carbons). This parameter change ensures the alcohol remains in solution during extended storage, continuously solubilizing the azole compound and preventing crystallization on tool parts and treated substrates.
Solution Approach 2:
The patent provides beforehand cushioning against crystallization by incorporating sufficient high boiling point alcohol in the composition formulation. This preemptive measure ensures that even during extended storage periods, the azole compound remains solubilized and does not crystallize, protecting both the composition stability and preventing deposits on equipment and products.
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 use of high boiling point alcohols stabilizes the OSP composition, preventing azole compound crystallization and ensuring effective corrosion protection for copper and gold surfaces, maintaining solderability and cosmetic quality over extended durations.
Implementation Method 1
Incorporating a high boiling point, low volatility alkyl cyclic alcohol or monohydric alcohol with a boiling point of at least 150°C, which enhances the solubility and stability of azole compounds
Implementation Method 2
The OSP compositions of the present invention comprise a high boiling point alcohol which is characterized by low volatility
Data Source
AI summary
An organic solderability preservative (OSP) composition comprising an alkyl cyclic alcohol and an azole compound having enhanced composition stability against crystallization of the azole compound.