Metal-clad laminate with silane intermediate layer for low-loss PCB
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Solution Overview
Problem
Conventional printed wiring boards experience insufficient reduction in signal transmission loss due to inadequate flatness and smoothness of the junction surface between the wiring and the insulating layer, which can lead to decreased adhesion properties and peeling issues.
Innovation Solution
A metal-clad laminate with a cured insulating layer containing a polyphenylene ether compound and an intermediate layer with a silane compound, where the metal layer's junction surface has a ten-point average roughness Rz ranging from 0.5 μm to 4 μm, enhancing adhesion and reducing signal transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the junction surface between wiring and insulating layer is made smoother to reduce signal transmission loss, then signal transmission loss is reduced, but adhesion property deteriorates
Solution Approach 1:
The patent applies silane coupling agent treatment to the metal layer surface, creating an intermediate layer that mediates between the smooth metal surface and the insulating layer. This intermediate silane layer provides both smoothness for low signal loss and chemical bonding capability for strong adhesion, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent creates a composite structure by combining the metal layer with silane coupling agent treatment and the polyphenylene ether insulating layer. This composite approach allows the system to simultaneously achieve the properties of smooth surface (for low loss) and strong bonding (for adhesion) that cannot be obtained with a single material.
2Loss of energy
If the junction surface is made flatter to reduce signal transmission loss, then signal transmission loss is reduced, but adhesion property deteriorates
Solution Approach 1:
The silane coupling agent serves as an intermediary substance applied to the flattened metal surface. It creates a chemically active intermediate layer that maintains the flat geometry required for low signal loss while providing molecular-level bonding sites for the insulating layer, thus preserving adhesion strength despite surface flattening.
Solution Approach 2:
The patent changes the chemical parameters of the metal surface by applying silane coupling agent treatment. This chemical modification alters the surface properties from inert to reactive, enabling strong adhesion while maintaining the physical flatness parameter required for low signal transmission loss.
3Loss of energy
If a polyphenylene ether resin composition is used as substrate material to reduce signal transmission loss, then signal transmission loss is reduced, but adhesion to metal layer deteriorates
Solution Approach 1:
The patent applies silane coupling agent treatment to the metal layer surface in advance, before bonding with the polyphenylene ether insulating layer. This preliminary chemical treatment prepares the metal surface with enhanced bonding properties, ensuring strong adhesion is established before the insulating layer is applied, thus preventing adhesion issues despite using low-loss resin materials.
Solution Approach 2:
The silane coupling agent creates an intermediate bonding layer between the metal layer and the polyphenylene ether insulating layer. This intermediate layer is specifically designed to be compatible with both materials, providing strong chemical bonding to the metal while also bonding well with the ether groups in the polyphenylene ether, thus resolving the adhesion problem.
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 effectively reduces signal transmission loss and prevents peeling of the wiring from the insulating layer, ensuring a reliable and high-speed signal transmission in electronic devices.
Implementation Method 1
The intermediate layer includes a silane compound
Implementation Method 2
a cured insulating layer including a polyphenylene ether compound
Data Source
AI summary
A metal-clad laminate includes: a cured insulating layer including a polyphenylene ether compound; a metal layer joined with the insulating layer; and an intermediate layer interposed between the insulating layer and the metal layer, the intermediate layer including a silane compound. The metal layer has a junction surface that is joined with the insulating layer via the intermediate layer. The junction surface has a ten-point average roughness Rz ranging from 0.5 μm to 4 μm inclusive.