Resin Composition for High-Frequency PCBs
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Solution Overview
Problem
Electronic materials prepared with benzoxazine resin-based compositions face issues of insufficient heat resistance and poor dielectric properties, particularly high dissipation factor (Df), and appearance defects like fisheyes, which affect their performance in high-frequency applications.
Innovation Solution
A resin composition comprising an epoxy resin, a benzoxazine resin with a specific structure, and optional fillers and crosslinking agents, such as maleimide-based compounds and SMA copolymers, is used to enhance heat resistance, dielectric properties, and appearance quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If benzoxazine resin is used as a hardener to improve heat resistance, then heat resistance is improved, but dissipation factor (Df) increases and dielectric properties deteriorate
Solution Approach 1:
The patent modifies the chemical structure of the benzoxazine resin by changing the amino compound from monoamine to diamine (specifically 4,4'-diaminodiphenyl ether), which alters the molecular weight, functional group density, and crosslinking structure of the cured resin. This structural parameter change simultaneously improves heat resistance while maintaining low dissipation factor and dielectric constant.
Solution Approach 2:
The patent creates a composite resin system combining epoxy resin with specifically structured benzoxazine resin (ODA-type). The synergistic interaction between the epoxy matrix and the diamine-based benzoxazine hardener produces a composite material that achieves both high heat resistance and excellent dielectric properties, overcoming the limitations of using either component alone.
2Temperature
If phenolic novolac resin is used to improve heat resistance, then heat resistance is improved, but by-products are generated and physicochemical properties deteriorate
Solution Approach 1:
The patent removes the phenolic novolac resin component from the system and replaces it with benzoxazine resin. This extraction eliminates the source of volatile by-products generated during curing while maintaining the desired heat resistance through the diamine-based benzoxazine structure.
Solution Approach 2:
The patent converts the potential harm of using conventional hardeners (which generate by-products) into a benefit by selecting benzoxazine resin with diamine structure. The ring-opening polymerization mechanism of benzoxazine inherently produces minimal by-products, and the diamine substitution further optimizes this by creating a crosslinked structure that enhances heat resistance without the harmful emissions associated with phenolic novolac resin.
3Object-generated harmful factors
If conventional BZ hardeners are used to reduce by-products, then by-product generation is reduced, but heat resistance remains insufficient
Solution Approach 1:
The patent changes the key parameter of the benzoxazine resin from using monoamine compounds to using diamine compounds (4,4'-diaminodiphenyl ether). This parameter change increases the number of reactive amino groups per molecule, leading to higher crosslinking density and improved heat resistance while maintaining the low by-product generation characteristic of benzoxazine resin.
Solution Approach 2:
The patent develops a composite hardener system where diamine-based benzoxazine resin works synergistically with epoxy resin. This composite material approach achieves heat resistance levels that conventional BZ hardeners cannot attain, while preserving the environmental and processing advantages of benzoxazine chemistry.
4Temperature
If resin composition is optimized for heat resistance, then heat resistance is improved, but appearance defects (fisheyes) occur
Solution Approach 1:
The patent optimizes multiple parameters of the resin composition including the specific structure of benzoxazine resin, the ratio of epoxy resin to hardener, and the molecular weight distribution. These parameter optimizations create a balanced formulation that achieves high heat resistance through diamine crosslinking while preventing appearance defects by controlling viscosity, cure kinetics, and bubble formation characteristics.
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 improves heat resistance, reduces dielectric constants and dissipation factors, and prevents appearance defects, resulting in electronic materials suitable for high-frequency applications with better performance and reliability.
Implementation Method 1
Since the hardening mechanism of the BZ resin is a ring-opening-polymerization reaction that hardly generates volatile by-products
Implementation Method 2
Epoxy resin is a thermosetting resin, which has been used in electronic materials for a long time
Data Source
AI summary
A resin composition is provided. The resin composition comprises the following constituents:(A) epoxy resin;(B) a compound of formula (I),in formula (I), R1 and R2 are independently —H, —CH3, or —C(CH3); and(C) an optional filler.