Fluororesin Coating Composition for Copper Foil Adhesion
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Solution Overview
Problem
Existing fluororesin coating compositions face challenges in achieving sufficient adhesive properties between the fluororesin coating film and metal substrates, particularly with smooth copper foils having small surface roughness, while also requiring excellent heat resistance and electrical properties.
Innovation Solution
A coating composition containing 2 or more kinds of fluororesins, where at least one fluororesin (I) has a specific number of functional groups (30 to 1,000 per 10^6 main-chain carbon atoms) to enhance adhesive properties, combined with an inorganic filler, surfactant, and liquid medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fluororesin coating compositions are used, then electrical properties and heat resistance are maintained, but adhesive properties to metal substrates are insufficient
Solution Approach 1:
The patent uses composite materials by combining multiple fluororesins with different functional groups (carboxyl, hydroxyl, amine groups) in specific proportions. This composite approach allows the coating to simultaneously achieve strong adhesive properties through functional group interactions with metal substrates while maintaining excellent electrical properties and heat resistance characteristic of fluororesins. The synergistic effect of different fluororesin components resolves the contradiction between adhesion and performance reliability.
Solution Approach 2:
The patent changes key parameters of the fluororesin composition, specifically controlling the number of functional groups (30-1,000 per 10^6 main-chain carbon atoms) and the proportion of different fluororesin types. By optimizing these parameters, the coating achieves sufficient adhesive strength to metal substrates while preserving the electrical and thermal performance required for high-frequency applications.
2Strength
If fluororesin coating is applied to smooth copper foils, then electrical properties are maintained, but adhesive properties deteriorate due to small surface roughness
Solution Approach 1:
The patent introduces fluororesins containing functional groups (carboxyl, hydroxyl, amine) as intermediary substances between the smooth copper foil surface and the fluororesin coating. These functional groups act as chemical mediators that can form strong bonds with the metal substrate even on smooth surfaces, enabling adequate adhesion without requiring surface roughness modification while maintaining electrical properties.
3Strength
If multiple fluororesins are combined to improve adhesion, then adhesive properties are enhanced, but composition complexity increases
Solution Approach 1:
The patent manages composition complexity by precisely controlling key parameters: the number of functional groups (30-1,000 per 10^6 main-chain carbon atoms) and the proportion of different fluororesin types (5-50% by mass). This parameter-based approach simplifies the formulation process and quality control while achieving the desired adhesive enhancement through multiple fluororesin components.
Data Source
AI summary
Provided is an aqueous coating composition capable of forming a fluororesin coating film layer with excellent electrical properties and surface physical properties, and good adhesive properties. A coating composition containing 2 or more kinds of fluororesins, where at least 1 kind of the fluororesin, a fluororesin (I), has a number of functional groups of 30 to 1,000 per 106 main-chain carbon atoms, and where the coating composition further contains an inorganic filler, a surfactant, and a liquid medium.