Electret Materials Thermal Stability via Aromatic Trisamides

Solution Overview

Problem

Existing electret materials lack sufficient thermal and charge stability, which limits their performance in applications such as filter media, acoustic materials, and contactless switches.

Innovation Solution

Incorporating aromatic trisamide compounds into thermoplastic polymers, specifically polyolefins, and subjecting them to an electret treatment, such as corona treatment, to enhance thermal and charge stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional electret materials are used, then basic filtering function is provided, but thermal stability is insufficient

Engineering Contradiction:

Improvethermal stabilityVSAvoidcharge stability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent modifies the chemical composition parameters of the electret material by incorporating specific additives (hindered amine light stabilizers and/or metal-containing hindered phenols) into the polyolefin matrix. This compositional parameter change enhances the material's thermal stability while preserving its electret properties and charge stability across elevated temperature ranges.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electret material by combining polyolefin base material with functional additives (hindered amine light stabilizers and/or metal-containing hindered phenols). This composite structure integrates the thermal stability benefits of the additives with the electret properties of the polyolefin, achieving improved overall thermal and charge stability.

Inventive Principle:

Principle #40Composite materials

2Reliability

If electret treatment is applied to improve charge stability, then performance is enhanced, but thermal stability remains insufficient

Engineering Contradiction:

Improvecharge stabilityVSAvoidthermal stability

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent modifies the chemical composition parameters of the electret material by incorporating specific additives (hindered amine light stabilizers and/or metal-containing hindered phenols) into the polyolefin matrix. This compositional parameter change enhances the material's thermal stability while preserving its electret properties and charge stability across elevated temperature ranges.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electret material by combining polyolefin base material with functional additives (hindered amine light stabilizers and/or metal-containing hindered phenols). This composite structure integrates the thermal stability benefits of the additives with the electret properties of the polyolefin, achieving improved overall thermal and charge stability.

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If stabilizing additives are incorporated to improve thermal stability, then charge stability is enhanced, but material complexity increases

Engineering Contradiction:

Improvethermal stabilityVSAvoidmaterial composition complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent modifies the chemical composition parameters of the electret material by incorporating specific additives (hindered amine light stabilizers and/or metal-containing hindered phenols) into the polyolefin matrix. This compositional parameter change enhances the material's thermal stability while preserving its electret properties and charge stability across elevated temperature ranges.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electret material by combining polyolefin base material with functional additives (hindered amine light stabilizers and/or metal-containing hindered phenols). This composite structure integrates the thermal stability benefits of the additives with the electret properties of the polyolefin, achieving improved overall thermal and charge stability.

Inventive Principle:

Principle #40Composite materials

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 resulting electret materials exhibit improved thermal and charge stability, maintaining performance over time and across various environmental conditions.

Implementation Method 1

incorporated therein, an effective stabilizing amount of one or more aromatic trisamide compounds

Methodology Applied

Scientific EffectThermal stabilization:

Implementation Method 2

subjecting the blend to an electret treatment

Methodology Applied

Scientific EffectElectret effect: Electret

Implementation Method 3

subjecting them to an electret treatment, such as corona treatment

Methodology Applied

Scientific EffectCorona discharge: Corona Discharge

Data Source

PatentUS8415416B2Electret materials

Publication Date: 2013.04.09 BASF SE

AI summary

Disclosed are electret materials with outstanding thermal and charge stability. The electret materials comprise a melt blend of a thermoplastic polymer and one or more compounds selected from the aromatic trisamides. The aromatic trisamides are for example of the formulaThe melt blends are subjected to an electret treatment, for example a corona treatment. The electret materials are for example nonwoven polyolefin webs and are employed as filter materials, wipes, absorbent materials, filter masks, acoustic materials, printing substrates, measuring devices or contactless switches. The present electret materials may also comprise a further additive selected from the hindered amine light stabilizers and the hydroxyphenylalkylphosphonic esters or monoesters.