Flame Resistant Polyphthalamide Blend with Phosphinate

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Solution Overview

Problem

Polyphthalamide/poly(arylene ether) blends face challenges in achieving flame retardancy at lower thicknesses while maintaining mechanical properties, particularly due to the limitations of halogenated flame retardants and the negative impact of high levels of non-halogenated flame retardants on physical properties.

Innovation Solution

A flame-resistant composition comprising a polyphthalamide and a poly(arylene ether) blend, with a functionalizing agent and phosphinate as key components, which exhibits excellent flame retardancy even at lower thicknesses, as determined by UL 94 Vertical Burning Tests, and maintains mechanical properties by minimizing aliphatic polyamide content.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If halogenated flame retardant systems are used, then flame retardancy is improved, but environmental and health concerns increase

Engineering Contradiction:

Improveflame retardancyVSAvoidenvironmental and health harm

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters by using non-halogenated flame retardants (specifically phosphinate salts) instead of halogenated systems, and by controlling the ratio of aromatic to aliphatic polyamides. This parameter change achieves flame retardancy without the harmful effects of halogenated compounds.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system combining polyphthalamide, poly(arylene ether), and non-halogenated phosphinate flame retardants. This composite approach achieves flame retardancy through the synergistic interaction of components while avoiding harmful halogenated substances.

Inventive Principle:

Principle #40Composite materials

2Reliability

If high levels of non-halogenated flame retardants are used, then flame retardancy is improved, but mechanical properties deteriorate

Engineering Contradiction:

Improveflame retardancyVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The invention optimizes the concentration parameter of flame retardants by using a specific composition ratio: 1-10 parts phosphinate per 100 parts polyphthalamide, and controlling the aromatic to aliphatic polyamide ratio to be at least 20:80. These parameter optimizations achieve flame retardancy while preserving mechanical properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention applies different functional components in specific proportions: polyphthalamide for structural integrity, poly(arylene ether) for thermal stability, and phosphinate for flame retardancy. This local quality differentiation allows each component to contribute its specific property without compromising overall performance.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If non-halogenated flame retardants are used, then environmental compatibility is improved, but flame retardant performance decreases

Engineering Contradiction:

Improveenvironmental compatibilityVSAvoidflame retardant performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention creates a composite system where polyphthalamide, poly(arylene ether), and phosphinate work synergistically. The polyphthalamide provides a stable matrix, poly(arylene ether) enhances thermal resistance, and phosphinate delivers flame retardancy, achieving both environmental compatibility and effective flame protection.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the chemical parameters by selecting specific phosphinate salts and controlling their concentration (1-10 parts per 100 parts polyphthalamide), along with maintaining an aromatic to aliphatic polyamide ratio of at least 20:80. These parameter changes optimize flame retardant performance while maintaining environmental compatibility.

Inventive Principle:

Principle #35Parameter changes

4Temperature

If polyamide 6T is used, then melting point is improved, but processability and blendability deteriorate

Engineering Contradiction:

Improvemelting pointVSAvoidprocessability and blendability

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The invention changes the polyamide composition parameters by using polyphthalamide copolymers containing both aromatic and aliphatic units, rather than pure polyamide 6T. This compositional parameter change reduces the melting point and improves processability while maintaining high-temperature performance through the aromatic content.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite blend of polyphthalamide and poly(arylene ether) that combines the high-temperature resistance of aromatic polyamides with the processability benefits of aliphatic polyamides and the thermal stability of poly(arylene ether), achieving both processability and performance.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP2285906B1Flame resistant polyphthalamide/poly(arylene ether) composition

Publication Date: 2019.05.22 SABIC GLOBAL TECHNOLOGIES BV

AI summary

Disclosed herein is a flame resistant composition comprising a compatibilized blend of a polyphthalamide and a poly(arylene ether); and a phosphinate, wherein the composition is substantially free of linear aliphatic polyamides.