Low-Residue PTFE Dielectric for Blister-Free Copper-Clad Laminates
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Solution Overview
Problem
Existing dielectrics used in high-frequency printed wiring boards cause blistering of copper foils during laminate production due to excessive residual organic matter, leading to variations in electrical characteristics.
Innovation Solution
A dielectric with a residual organic matter content of 500 µg/g or less, composed of a non-melt-processible fluororesin like PTFE and an inorganic filler such as silica, is used, along with a copper foil with a surface roughness of 2.0 µm or less, to prevent blistering and maintain excellent electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dielectric with conventional residual organic matter content is used, then the dielectric can be easily manufactured, but copper foil blistering occurs during laminate production
Solution Approach 1:
The patent applies parameter changes by strictly controlling the residual organic matter content to 500 μg/g or less. This quantitative parameter control transforms the manufacturing process to eliminate blistering while maintaining ease of manufacture through standardized production protocols.
Solution Approach 2:
The dielectric uses a composite material system combining fluororesin (such as PTFE) with inorganic fillers. This composite structure reduces residual organic matter content while maintaining manufacturing feasibility, thereby preventing copper foil blistering during lamination.
2Object-affected harmful factors
If the residual organic matter content is reduced to 500 μg/g or less, then copper foil blistering is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
By establishing a clear quantitative threshold (500 μg/g or less) for residual organic matter, the patent simplifies the control process despite the stringent requirement. This parameter-based approach provides a straightforward manufacturing target that reduces process complexity.
Solution Approach 2:
The dielectric material composition (fluororesin with inorganic fillers) inherently supports low residual organic matter content, allowing the material itself to facilitate meeting the 500 μg/g threshold without requiring overly complex external processing steps.
3Reliability
If a fluororesin with high filler content is used, then excellent electrical characteristics are achieved, but the dielectric becomes more difficult to process
Solution Approach 1:
The patent employs a composite material system where fluororesin is combined with inorganic fillers at optimized ratios. This composite structure achieves excellent electrical characteristics (low dielectric constant and loss) while maintaining adequate processability through careful material selection and formulation.
Solution Approach 2:
The dielectric exhibits local quality optimization by concentrating filler particles in specific regions or arrangements within the fluororesin matrix. This allows high filler content for excellent electrical properties in critical areas while maintaining overall processability of the dielectric material.
Data Source
AI summary
A dielectric that has excellent electrical characteristics and causes no blistering of a copper foil during production of a copper-clad laminate using the dielectric, and a method for producing the same are provided. Further, a copper-clad laminate using the dielectric, and a method for producing the same are provided. The dielectric has a residual organic matter content of 500 µg/g or less. The metal-clad laminate has the dielectric and a metal foil.