POSS Dielectric Circuit Materials for Halogen-Free Flame Retardancy
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Solution Overview
Problem
Current polymeric dielectric materials used in circuit materials and multi-layer circuits lack inherent flame retardancy, and substituting bromine-containing additives with other flame retardants often compromises electrical and thermal properties, necessitating a solution that maintains performance while removing hazardous substances.
Innovation Solution
The use of a polymer comprising covalently bound polyhedral silsesquioxane (POSS) as a dielectric material, which is inherently flame retardant and can be combined with silica and glass cloth to create circuit materials with excellent electrical and thermal properties without halogenated additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If bromine-containing additives are used to achieve flame retardancy, then flame retardant performance is improved, but electrical and thermal properties deteriorate
Solution Approach 1:
The patent extracts and removes bromine-containing additives from the circuit material composition entirely, replacing them with a bromine-free flame retardant system based on polyhedral oligomeric silsesquioxane (POSS) and metal hydroxides, thereby eliminating the harmful trade-off between flame retardancy and electrical/thermal performance
Solution Approach 2:
The patent employs a composite material system combining polyhedral oligomeric silsesquoxane (POSS) with metal hydroxides (such as aluminum hydroxide or magnesium hydroxide) and a polymeric binder, creating a synergistic flame retardant composition that achieves both flame protection and maintained electrical/thermal properties without using bromine compounds
2Object-affected harmful factors
If other flame retardant additives are used to substitute bromine-containing compounds, then bromine is removed, but electrical and thermal properties are compromised
Solution Approach 1:
The patent optimizes the parameters of the flame retardant system by controlling the particle size, surface treatment, and concentration of metal hydroxide fillers within specific ranges (e.g., 20-80 weight percent total filler content, controlled particle size distributions) to achieve both bromine-free flame retardancy and preserved electrical/thermal performance
Solution Approach 2:
The patent uses surface-treated metal hydroxide particles with controlled surface chemistry as intermediaries that facilitate both flame retardant function and maintenance of electrical/thermal properties, with the surface treatment acting as a mediator between the filler and the polymeric binder to optimize performance
3Object-affected harmful factors
If large amounts of flame retardant additives are added to achieve flame retardancy, then flame retardant performance is improved, but electrical properties deteriorate
Solution Approach 1:
The patent precisely controls the concentration and distribution of flame retardant additives within optimized ranges (e.g., 20-80 weight percent total filler, specific ratios of different fillers) to achieve adequate flame retardancy while minimizing the negative impact on electrical properties through parameter optimization rather than excessive additive loading
4Ease of manufacture
If conventional polymeric dielectric materials are used, then ease of manufacture is maintained, but inherent flame retardancy is lacking
Solution Approach 1:
The patent creates a composite dielectric material system that combines conventional polymeric binders (maintaining ease of manufacture and processing) with integrated flame retardant components (POSS and metal hydroxides), thereby achieving both processability and inherent flame retardancy in a unified material composition
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 covalently bound polyhedral silsesquioxane-based dielectric materials provide flame retardancy, suitable electrical properties, and a UL-94 rating of V-0, ensuring the circuit materials are safe and perform well in thermal and electrical applications without the drawbacks of halogenated compounds.
Implementation Method 1
The polymer comprising a covalently bound polyhedral silsesquioxane is inherently flame retardant and can be used to form flame retardant circuit materials having excellent electrical and physical properties
Data Source
AI summary
An electrical circuit material having a conductive layer disposed a substrate, wherein the substrate comprises an organic or inorganic polymer comprising a covalently bound polyhedral silsesquioxane (POSS). The substrate may further comprise an additional dispersed POSS, any other fillers including fibrous webs. Use of covalently bound POSS allows for flame retardancy in compositions having acceptable dielectric constants and dissipation factors.