Halogenated Aryl Ether Oligomer Flame Retardant

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Solution Overview

Problem

Existing brominated polymer flame retardants have low bromine content, leading to inefficient flame retardation and negative impacts on mechanical properties of polymer formulations, requiring higher loadings and resulting in inferior performance.

Innovation Solution

Development of halogenated aryl ether oligomers with a higher bromine content, ranging from 50 to 83 wt%, which are used as flame retardants in polymer compositions to enhance mechanical properties and thermal stability, particularly in thermoplastic and thermosetting polymers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If brominated polymer flame retardants are used, then flame retardation is achieved, but bromine content is low leading to inefficient flame retardation and negative impacts on mechanical properties

Engineering Contradiction:

Improveflame retardation efficiencyVSAvoidbromine content

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the chemical structure parameters of the flame retardant by introducing aryl ether linkages between brominated phenolic units, creating a polymeric structure that increases bromine content from typical low levels to 5-15% range, thereby improving flame retardation efficiency while maintaining mechanical properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite polymeric flame retardant structure combining brominated phenolic units with aryl ether linkages, integrating multiple functional elements (bromine for flame retardation, aryl ether for structural integrity) into a single material system that achieves both high efficiency and good mechanical performance

Inventive Principle:

Principle #40Composite materials

2Reliability

If higher loadings of flame retardant are used to compensate for low bromine content, then flame retardation is improved, but mechanical properties deteriorate

Engineering Contradiction:

Improveflame retardation performanceVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent optimizes the bromine content parameter to 5-15% range and controls the polymeric structure parameters to achieve maximum flame retardation efficiency at lower loadings, thereby preventing mechanical property deterioration that would occur with higher loadings of conventional flame retardants

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If polymeric or oligomeric flame retardant compounds are used, then compatibility with base resin is improved and blooming is reduced, but bromine content decreases leading to lower flame retardation efficiency

Engineering Contradiction:

Improvecompatibility and anti-bloomingVSAvoidbromine content

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The patent creates a polymeric composite structure where brominated phenolic units are linked through aryl ether bonds, maintaining the polymeric nature for compatibility and anti-blooming while incorporating sufficient bromine (5-15%) to achieve high flame retardation efficiency, thus resolving the trade-off between polymeric benefits and bromine content

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS8158038B2Flame retardant halogenated polymer compositions

Publication Date: 2012.04.17 LANXESS SOLUTIONS US INC

AI summary

A halogenated aryl ether oligomer is formed by halogenation of an aryl ether oligomer and is useful as a flame retardant for flammable macromolecular materials. Typically, the halogenated aryl ether oligomer comprises the following repeating monomeric units:wherein R is hydrogen or alkyl, especially C1 to C4 alkyl, Hal is halogen, m is at least 1, n is 0 to 3 and x is at least 2.