Adhesive Composition for High-Frequency Circuits
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Solution Overview
Problem
Current high-frequency flexible printed circuits (FPCs) face challenges with high dielectric constant and loss, which impede signal transmission, and existing adhesives require high-temperature processing, incompatible with low-temperature quick press technologies used in FPC manufacturing.
Innovation Solution
An adhesive composition comprising solvent-soluble polyimide, propenyl-modified polyphenylene oxide resin, and epoxy resin, optionally including flexibilizers, flame retardants, inorganic fillers, and catalysts, designed to provide low dielectric constant and loss, heat resistance, and flexibility, suitable for high-frequency applications and processed at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LCP material is used for high-frequency transmission, then dielectric constant and dielectric loss are reduced, but processing temperature requirement increases significantly
Solution Approach 1:
The patent uses a composite adhesive system combining polyimide resin, polyphenylene oxide resin, and epoxy resin. This composite formulation achieves low dielectric constant (Dk<3.5) and low dielectric loss (Df<0.01) while enabling processing at lower temperatures (80-150°C) compared to pure LCP materials, thus resolving the contradiction between high-frequency performance and processing temperature requirements
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific ratios of polyimide (40-70 parts), polyphenylene oxide (5-25 parts), and epoxy resin (10-30 parts). This parameter optimization allows the adhesive to achieve both low Dk/Df values for high-frequency applications and reduced processing temperature compared to conventional LCP-based adhesives
2Reliability
If high-temperature processing equipment is used for LCP adhesive, then high-frequency characteristics are achieved, but production rate decreases and equipment complexity increases
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature (conventional LCP requires >200°C) to low-temperature (80-150°C) processing by optimizing the adhesive composition. This allows use of existing FPC production equipment without high-temperature specialized equipment, thereby maintaining high production rates while achieving low Dk (<3.5) and low Df (<0.01) for high-frequency applications
Solution Approach 2:
The adhesive composition is designed to be universally compatible with existing FPC production equipment and processes. It can be processed using standard lamination equipment at temperatures of 80-150°C, making it applicable to both low-temperature quick press processes and conventional processes, thus eliminating the need for specialized high-temperature equipment while maintaining high-frequency performance
3Ease of manufacture
If conventional adhesive formulations are used, then processing is simple, but dielectric constant and dielectric loss are too high for high-frequency applications
Solution Approach 1:
The patent employs a composite adhesive formulation consisting of polyimide resin (40-70 parts), polyphenylene oxide resin (5-25 parts), and epoxy resin (10-30 parts). This composite structure achieves low dielectric constant (Dk<3.5) and low dielectric loss (Df<0.01) suitable for high-frequency applications, while maintaining ease of manufacture through conventional mixing and application processes without requiring complex multi-step procedures
Solution Approach 2:
The adhesive formulation incorporates specific functional components at optimized ratios to achieve local optimization of dielectric properties. The polyimide provides the base low-Dk structure, while polyphenylene oxide and epoxy resin components are added in specific amounts (5-25 parts and 10-30 parts respectively) to further reduce dielectric loss and enhance high-frequency performance, all while maintaining simple processing
Data Source
AI summary
An adhesive composition with high frequency characteristics and the application thereof; wherein, the adhesive composition has a total weight of (A), (B) and (C) in 100 parts by weight, comprising: (A) 40-80 parts by weight of solvent-soluble polyimide; (B) 5-30 parts by weight of propenyl-modified polyphenylene oxide resin; (C) 10-30 parts by weight of epoxy resin; and optionally comprising at least one of the following components: (D) flexibilizer; (E) flame retardant; (F) inorganic filler; (G) coupling agent; and (H) catalyst. The adhesive composition has the advantages of low dielectric constant, low dielectric loss, favorable heat resistance and low-temperature (<180° C.) adhesion. The adhesive composition can be used for preparing high-frequency protective membrane and high-frequency adhesive film.