Aromatic Thio Coating for Metal-Resin Adhesion
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Solution Overview
Problem
Existing methods for improving adhesion between metals and resins in printed wiring boards are inefficient, requiring deep etching which limits thinning and microfabrication, and conventional coating film-forming compositions have poor film adhesion and surface treatment efficiency, necessitating extended contact times or drying under specific conditions.
Innovation Solution
A coating film-forming composition containing an aromatic compound with an amino group and an aromatic ring, combined with a thio compound or its salt, which forms a coating film on metal surfaces with excellent adhesion to resins, even in short contact times and without the need for additional drying steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep etching is performed to improve adhesion between metal and resin, then adhesion is improved, but wiring thickness is significantly reduced and microfabrication is limited
Solution Approach 1:
The invention changes the chemical parameters of the surface treatment solution by introducing a specific aromatic compound with amino group and aromatic ring structure, combined with a thio compound. This chemical parameter change enables effective adhesion promotion without requiring deep physical etching, thus maintaining wiring thickness while improving metal-resin adhesion.
Solution Approach 2:
The coating film formed by the aromatic compound and thio compound acts as an intermediary layer between the metal surface and the resin. This intermediate coating film provides excellent adhesion to both the metal substrate and the resin, eliminating the need for deep etching while ensuring strong bonding.
2Reliability
If conventional coating film-forming compositions are used to improve adhesion, then adhesion is improved, but film adhesion is poor and surface treatment efficiency is low
Solution Approach 1:
The invention uses a composite chemical system combining a specific aromatic compound (with amino group and aromatic ring) and a thio compound. This composite material approach creates a coating film with superior adhesion properties that cannot be achieved with single-component conventional compositions, thereby improving both film adhesion quality and surface treatment efficiency.
3Reliability
If extended contact time is used with conventional compositions to improve adhesion, then adhesion is improved, but production efficiency is reduced
Solution Approach 1:
The invention changes the chemical reactivity parameters by using a highly active aromatic compound with amino group and aromatic ring structure combined with a thio compound. This parameter change enables the coating film to form rapidly with excellent adhesion, eliminating the need for extended contact times and thereby improving production efficiency.
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 composition significantly enhances metal-resin adhesion, improves acid resistance, and allows for the formation of a durable coating film that can be formed quickly, simplifying the process and improving the efficiency of metal-resin composite production.
Implementation Method 1
a coating film-forming composition containing an aromatic compound having an amino group and an aromatic ring in one molecule, and a thio compound or a salt thereof
Implementation Method 2
a thio compound or a salt thereof, which forms a coating film on metal surfaces with excellent adhesion to resins
Data Source
Figure 1~2
AI summary
The coating film-forming composition includes an aromatic compound having an amino group and an aromatic ring in one molecule, and thio compound (sulfur oxoacids having a pKa of -1.9 or less and salts thereof are excluded). pH of the coating film-forming composition is 4 to 10. The thio compound is preferably one that ionized to form anions in a solution, and thiosulfate and thiocyanate are especially preferable. By bringing the coating film-forming composition into contact with the surface of a metal member, a coating film is formed on the surface of the metal member, so that a surface-treated metal member can be obtained.