Cyanate Ester Resin Composition for High-Frequency PCBs
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Solution Overview
Problem
Current resin compositions for printed wiring boards face challenges in achieving low dielectric constants, low dielectric loss tangents, and high heat resistance, particularly in high-frequency applications, with polyphenylene ether resins having poor flow properties and cyanate ester resins being unsatisfactory in meeting these requirements, and the addition of silica leading to uneven molding due to poor dispersion.
Innovation Solution
A resin composition comprising a cyanate ester resin, a bisphenol A epoxy resin, a novolak epoxy resin, a brominated polycarbonate oligomer, a low polymer of styrene or substituted styrene, and spherical silica particles, along with a wetting and dispersing agent, which improves dispersion and flow properties, resulting in excellent dielectric characteristics and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyphenylene ether resins are used to achieve high heat resistance, then heat resistance is improved, but flow properties during molding deteriorate due to high melt viscosity
Solution Approach 1:
The invention uses a composite resin system combining cyanate ester resin (for low dielectric properties and moldability) with polyphenylene ether resin (for heat resistance). This composite approach allows the material to achieve high heat resistance while maintaining good flow properties during molding, as the cyanate ester component compensates for the high viscosity of polyphenylene ether.
Solution Approach 2:
The invention changes the molecular weight parameter of the polyphenylene ether resin by using low molecular weight polyphenylene ether (number average molecular weight: 10,000 to 50,000). This parameter change reduces the melt viscosity compared to conventional high molecular weight polyphenylene ether, thereby improving flow properties during molding while maintaining heat resistance.
2Reliability
If cyanate ester resins are used to achieve low dielectric constant and low dielectric loss tangent, then dielectric characteristics are improved, but heat resistance deteriorates
Solution Approach 1:
The invention creates a composite resin system where cyanate ester resin provides excellent dielectric characteristics (low dielectric constant and low dielectric loss tangent) while polyphenylene ether resin contributes high heat resistance. The synergistic combination allows both requirements to be satisfied simultaneously.
3Temperature
If silica is added in large amounts to achieve high heat resistance and low dielectric loss tangent, then heat resistance and dielectric characteristics are improved, but surface appearance deteriorates due to poor dispersion
Solution Approach 1:
The invention introduces a silane coupling agent as an intermediary substance between the silica filler and the resin matrix. This coupling agent improves the interfacial adhesion and dispersion of silica particles in the resin, preventing aggregation and ensuring uniform distribution. As a result, the molding surface appearance is maintained even with high silica content, while achieving high heat resistance and low dielectric loss tangent.
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 composition provides laminated sheets with improved surface appearance, dielectric characteristics, and heat resistance, making them suitable for high-frequency multilayered printed wiring boards with enhanced utility in industries.
Implementation Method 1
a wetting and dispersing agent, wherein the low polymer of styrene and/or substituted styrene (e) is an unbranched compound or resin obtained by polymerizing one of or two or more of aromatic vinyl compounds selected from styrene, vinyl toluene, α-methylstyrene
Implementation Method 2
a cyanate ester resin having two or more cyanate groups in the molecule; (b) a bisphenol A epoxy resin having two or more epoxy groups in the molecule; (c) a novolak epoxy resin having two or more epoxy groups in the molecule
Data Source
AI summary
There are provided a cyanate ester resin composition for highly multilayered printed wiring boards for high-frequency applications which exhibits excellent heat resistance and dielectric characteristics and which can yield moldings with an excellent surface appearance, a prepreg prepared using the same, and a metal foil-clad laminated sheet. The resin composition comprises (a) a cyanate ester resin having two or more cyanate groups in the molecule, (b) a bisphenol A epoxy resin having two or more epoxy groups in the molecule, (c) a novolak epoxy resin having two or more epoxy groups in the molecule, (d) a brominated polycarbonate oligomer, (e) a low polymer of styrene and/or a substituted styrene, (f) spherical silica particles having a mean particle diameter of 3 µm or less, and (g) a wetting and dispersing agent.