Fluoropolymer Composition for Low-Temperature Copper Bonding
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Solution Overview
Problem
Perfluoropolymers have not been widely used in electronic telecommunications due to the lack of materials that can bond effectively with substrates like copper, especially at lower temperatures, limiting their replacement for polyimides in various applications.
Innovation Solution
Development of a fluoropolymer composition comprising at least 80% by weight of polymerized units of perfluorinated monomers, including unsaturated perfluorinated alkyl ethers, combined with crystalline fluoropolymers, which lacks crosslinks of a chemical curing agent, allowing for better adhesion and performance in electronic telecommunication articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluoropolymers are used to achieve lower dielectric constants and losses, then electrical performance is improved, but bonding capability to copper substrates deteriorates
Solution Approach 1:
The patent employs composite materials by combining perfluorinated monomers (80-99.9 wt%) with small amounts of non-perfluorinated monomers (0.1-20 wt%) that provide bonding functionality. This composite approach allows the fluoropolymer to maintain its low dielectric properties while the non-perfluorinated segments enable effective bonding to copper substrates without requiring chemical curing agents.
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating specific non-perfluorinated monomers (vinyl monomers, acrylic monomers, or carboxylic acid monomers) in controlled amounts (0.1-20 wt%). This parameter modification enables the fluoropolymer to achieve both low dielectric constant and improved adhesion to metal substrates at lower processing temperatures.
2Strength
If chemical curing agents are used to improve bonding, then adhesion is improved, but material complexity and processing difficulty increase
Solution Approach 1:
The patent extracts and eliminates chemical curing agents from the fluoropolymer composition entirely. Instead, it incorporates non-perfluorinated monomers directly into the polymer chain that provide inherent bonding capability to copper and other substrates, simplifying the material system and processing while maintaining or improving adhesion performance.
Solution Approach 2:
The fluoropolymer composition performs self-bonding to substrates through the inherent reactivity of non-perfluorinated monomer units (vinyl, acrylic, or carboxylic acid groups) that are integrated into the polymer structure. This self-service capability eliminates the need for separate chemical curing agents and simplifies the overall material system.
3Reliability
If high perfluorinated monomer content (≥80%) is used to achieve lower dielectric constants, then electrical performance is improved, but adhesion to substrates deteriorates
Solution Approach 1:
The patent applies local quality by creating a fluoropolymer with heterogeneous structure where most segments (80-99.9% perfluorinated units) provide low dielectric constant, while specific local segments (0.1-20% non-perfluorinated units with vinyl, acrylic, or carboxylic acid groups) provide adhesion functionality. This spatial distribution of different functional units resolves the contradiction between electrical performance and adhesion.
Data Source
AI summary
Electronic telecommunication articles are described comprising a layer of fluoropolymer composition comprising: an amorphous fluoropolymer comprising at least 80, 85, or 90% by weight of polymerized units perfluorinated monomers including one or more unsaturated perfluorinated alkyl ethers; and crystalline fluoropolymer; wherein the fluoropolymer composition lacks crosslinks of a chemical curing agent. Also described are methods of making a coated substrate, substrates comprising a fluoropolymer composition, and fluoropolymer compositions.