Polyamic Acid Composition for Copper-Adherent Polyimide Coatings
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Solution Overview
Problem
Existing polyamic acid compositions and polyimide resins do not exhibit excellent adhesion to conductors while maintaining heat resistance, insulation, and mechanical properties, leading to appearance defects in insulating coatings.
Innovation Solution
A polyamic acid composition comprising specific diamine monomers, including a flexible diamine monomer with three or more benzene rings and a triazine-based diamine monomer, along with a dianhydride monomer, to enhance adhesion and mechanical properties, and a solvent system, and a nanosilica surface-modified with organosilane to improve dispersibility and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general polyamic acid compositions are used to form insulating coatings, then heat resistance and insulation properties are achieved, but adhesion to conductors deteriorates leading to appearance defects
Solution Approach 1:
The patent introduces a specific diamine monomer containing a triazine ring structure at particular positions (where R1-R6 are specific groups including -NH2, -OH, or H). This creates local functional regions within the polyimide chain that specifically enhance adhesion to copper conductors while the overall polyimide structure maintains its heat resistance and insulation properties. The triazine ring acts as a local adhesion-promoting moiety without compromising the global thermal stability of the polymer.
Solution Approach 2:
The patent creates a composite polyimide structure by incorporating a specially designed diamine monomer (with triazine ring) into the polyamic acid composition along with conventional diamine monomers. This composite approach combines the adhesion benefits of the triazine-containing monomer with the thermal and mechanical properties of the overall polyimide system, achieving simultaneous improvement in both adhesion and heat resistance.
2Ease of manufacture
If conventional polyamic acid composition is used, then manufacturing simplicity is maintained, but adhesion properties deteriorate requiring complex formulations
Solution Approach 1:
The patent modifies the chemical structure of the diamine monomer by incorporating a triazine ring with specific substituent groups (R1-R6) at defined positions. This structural parameter change fundamentally alters the adhesion mechanism of the polyimide to copper conductors. The composition maintains simplicity by using a defined molar ratio range (0.1-10 mol% of the triazine-containing diamine monomer) rather than requiring complex multi-component formulations.
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 achieves improved adhesion to conductors, enhancing peel strength and mechanical properties, and reduces defects in coatings, thereby improving the durability and performance of the film.
Implementation Method 1
the third diamine monomer, which contains a functional group capable of forming a coordination bond with Cu, may be contained in the polyimide chain to improve adhesion
Implementation Method 2
a nanosilica surface-modified with organosilane to improve dispersibility and adhesion
Data Source
AI summary
The present invention provides a polyamic acid composition comprising a dianhydride monomer and a diamine monomer as polymerization units, wherein the diamine monomer comprises a first diamine monomer, a second diamine monomer, and a third diamine monomer, the second diamine monomer is a flexible diamine monomer having three or more benzene rings, and the third diamine monomer is represented by Chemical Formula 1. The polyamic acid composition of the present disclosure may have excellent adhesion and adherence to wires h as copper, and thus may have excellent usability as an insulating coating material for an electric wire, etc.