Phosphorus-Modified Polyphenylene Ether Resin for High-Frequency Circuit Boards
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Solution Overview
Problem
Current materials for high-frequency circuit boards, such as epoxy resins and polyphenylene ether resins, face challenges in achieving optimal dielectric properties, heat resistance, and flame retardancy while having poor processability and reliability, and existing halogen-free flame retardants often compromise dielectric performance or require high amounts, leading to toxicity and processing issues.
Innovation Solution
A thermosetting resin composition incorporating a phosphorus-containing monomer or resin with a specific structure, combined with polyphenylene ether resin containing unsaturated groups, which eliminates polar groups, enhances cross-linking, and provides intrinsic flame retardancy, improving dielectric properties and heat resistance without generating secondary hydroxyl groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin is used for circuit boards, then bonding property is improved, but dielectric constant and dielectric loss tangent increase, resulting in insufficient high frequency characteristics
Solution Approach 1:
The patent uses a composite resin system combining polyphenylene ether (PPE) base resin with cyclic carbonate curing agent, creating a material that achieves both good bonding and excellent dielectric properties suitable for high-frequency applications
2Reliability
If thermoplastic fluororesin is used, then dielectric constant and dielectric loss tangent are reduced, but melting temperature and melt viscosity increase, resulting in poor flowability and molding difficulty
Solution Approach 1:
The patent changes the chemical structure parameters by using polyphenylene ether with specific molecular weight and branching characteristics, combined with cyclic carbonate curing agents, achieving low dielectric loss while maintaining good processability through controlled crosslinking density
3Reliability
If polyphenylene ether resin is used, then dielectric properties are improved, but melting temperature and melt viscosity increase, resulting in poor workability and dimensional stability
Solution Approach 1:
The patent optimizes the polyphenylene ether resin parameters including molecular weight (10,000-50,000), branching structure, and combines it with specific cyclic carbonate curing agents to achieve the right balance between dielectric performance and workability during manufacturing
4Object-affected harmful factors
If bromine-based halogen-containing flame retardant is used, then flame-retardant effect is improved, but toxic gases such as hydrogen halides and dioxins are released when burned
Solution Approach 1:
The patent replaces harmful halogen-based flame retardants with phosphorus-containing compounds that provide equivalent or superior flame protection without generating toxic gases, converting the harmful halogen-free requirement into a beneficial environmental and health outcome
5Object-affected harmful factors
If metal hydroxide flame retardant is used, then flame retardancy is improved, but larger amount is required which causes poor resin flow and worse processing and mechanical properties
Solution Approach 1:
The patent uses phosphorus-containing flame retardant compounds with specific molecular structures and appropriate addition amounts (0.1-5 parts by weight), optimizing the chemical parameters to achieve good flame retardancy with minimal impact on resin flow and mechanical properties
6Object-affected harmful factors
If metal hydroxide flame retardant is used, then flame retardancy is improved, but dielectric constant increases, causing decrease in dielectric properties of high-frequency circuit substrates
Solution Approach 1:
The patent selects phosphorus-containing flame retardant compounds with low polarity and appropriate molecular weight, controlling their addition amount to achieve flame retardancy while maintaining low dielectric constant and loss tangent for high-frequency circuit board applications
7Object-affected harmful factors
If additive-type phosphorus-containing flame retardant is used, then flame retardancy is improved, but heat resistance decreases due to low melting point and poor cross-linking participation
Solution Approach 1:
The patent uses phosphorus-containing compounds with reactive groups that can participate in crosslinking reactions with the polyphenylene ether and cyclic carbonate system, changing the chemical reactivity parameters to achieve both flame retardancy and high heat resistance with glass transition temperature above 100°C
Solution Approach 2:
The patent creates a composite flame retardant system combining phosphorus-containing compounds with the polyphenylene ether-cyclic carbonate matrix, where the phosphorus compounds serve dual functions as both flame retardants and crosslinking agents, improving overall heat resistance
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 solution achieves low dielectric constant and loss tangent, excellent heat resistance, and good flame retardancy, making it suitable for high-frequency applications while maintaining processability and reliability, and is free from toxic by-products.
Implementation Method 1
the phosphorus-containing monomer or the phosphorus-containing resin has reactive groups and participates in cross-linking between the resin molecules of composite materials
Implementation Method 2
a phosphorus-containing monomer or a phosphorus-containing resin and a polyphenylene ether resin containing unsaturated groups
Data Source
AI summary
Disclosed are a thermosetting resin composition, a prepreg made therefrom, a laminate clad with a metal foil, and a high-frequency circuit board, wherein the thermosetting resin composition contains thermosetting ingredients. The thermosetting ingredients include a phosphorus-containing monomer or a phosphorus-containing resin and a polyphenylene ether resin containing an unsaturated group, and the phosphorus-containing monomer or the phosphorus-containing resin has a structure as shown in formula I. By using the phosphorus-containing monomer or the phosphorus-containing resin as a cross-linking agent of the polyphenylene ether resin containing an unsaturated group and by means of a cross-linking reaction of a large number of unsaturated double bonds in the resin, the high-frequency dielectric properties and high-temperature-resistance required by a circuit substrate are provided.