PPE Modified Epoxy Resin for Low Dielectric PCB Laminates
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Solution Overview
Problem
Existing polyphenylene ether (PPE) and epoxy resin combinations used in glass fiber laminated plates suffer from poor impregnation and separation, leading to compromised dielectric characteristics and heat resistance, which are inadequate for high-frequency signal transmission requirements in electronic products.
Innovation Solution
A polyphenylene ether modified phenol-benzaldehyde multifunctional epoxy resin is developed, with a specific molecular weight range and chemical structure, allowing for an addition reaction that enhances compatibility with glass fibers, resulting in a resin with low dielectric constant and dissipation factor, and improved heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyphenylene ether (PPE) and epoxy resin are used in glass fiber laminated plates, then low dielectric constant and low dissipation factor are achieved, but poor impregnation and separation occur between PPE, glass fiber fabric, and epoxy resin
Solution Approach 1:
The patent introduces a silane-modified polyphenylene ether as an intermediary material that acts as a coupling agent between the glass fiber fabric and epoxy resin. The silane groups on the PPE surface form chemical bonds with both the glass fibers and the epoxy matrix, eliminating the separation issue while maintaining the low dielectric properties of PPE.
Solution Approach 2:
The patent creates a composite material system by modifying PPE with silane groups, resulting in a tri-functional composite structure comprising silane-modified PPE, glass fiber fabric, and epoxy resin. This composite approach ensures compatible interaction between all three components, achieving uniform impregnation while preserving electrical properties.
2Temperature
If multifunctional phenol-benzaldehyde epoxy resin with high-density benzene ring structure is used, then excellent heat resistance and high Tg are achieved, but the resin may become gel with high molecular mass
Solution Approach 1:
The patent optimizes the molecular weight parameters of the phenol-benzaldehyde epoxy resin, selecting a specific range (viscosity 80-150 Pa·s at 25°C) that balances heat resistance with processability. This parameter control prevents excessive molecular mass that would lead to gelation while maintaining high Tg properties.
Solution Approach 2:
The patent introduces functional group distribution control, ensuring proper spacing and density of reactive groups within the resin structure. This local quality optimization allows the resin to achieve excellent heat resistance through high Tg while avoiding premature crosslinking and gelation during processing.
3Speed
If high-frequency signal transmission requirements are met, then transmission speed increases, but dielectric performance must be continuously improved
Solution Approach 1:
The patent develops a multifunctional epoxy resin that simultaneously provides structural support, heat resistance, and optimized dielectric properties for high-frequency applications. The resin serves multiple functions: maintaining mechanical integrity, enabling high Tg for heat resistance, and providing low dielectric constant for fast signal transmission.
Solution Approach 2:
The patent optimizes dielectric parameters by controlling the benzene ring structure density and functional group distribution in the phenol-benzaldehyde epoxy resin. This parameter optimization achieves low dielectric constant and dissipation factor, enabling high-frequency signal transmission while maintaining reliable electrical performance.
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 resin achieves a dielectric constant of 4.03 and dissipation factor of 0.0046, maintaining integrity after pressure cooking and soldering tests, ensuring reliable high-frequency signal transmission without delamination, thus addressing the limitations of previous materials.
Implementation Method 1
uses 100 parts of the polyphenylene ether and 5-60 parts of the epoxy resin to synthesize the prepolymerized solvent via catalyst; if it is the multifunctional epoxy resin and use the above formula to form the net structure via the addition reaction
Implementation Method 2
after the pressure cooking test (PCT) absorbed the water for 2 hours, its heat resistance allows it to be dipped in 288 soldering test for 60 minutes and no delamination takes place
Data Source
AI summary
The invention provides a polyphenylene ether modified phenol-benzaldehyde multifunctional epoxy resin with formula (I)whereinA is:PPE are:Z are:Y are:Their manufactured is following steps: polyphenylene ether 100 parts is dissolved in solvent, then phenol-benzaldehyde multifunctional epoxy resin 100˜450 parts and catalyst 0.01˜5 parts are added, stirred and mixed at 90˜180, for 1˜4 hour, to obtain formula (I) solution. Said product is formulated with compositions for laminate, having excellent electrical properties and heat resistance. The dielectric constant is 4.03(1 GHz), dissipation factor is 0.0046(1 GHz) and no delamination longer than 60 minutes dipping in 288 soldering test after 2 hours pressure cooking test. Application is insulating materials for highly reliable electronic components such as EMC, PCB substrates, laminate and insulating plates.