Polyetherimide Compositions with Inorganic Fillers for Electrical Tracking

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Solution Overview

Problem

Current polyetherimide compositions have limited electrical tracking resistance, which is essential for safety in electrical applications, and existing fillers do not significantly improve this property without compromising material cost, processability, or mechanical properties.

Innovation Solution

Incorporating 10 wt% to 50 wt% of talc, titanium dioxide, zirconium oxide, or neutral aluminum oxide into polyetherimide compositions to enhance electrical tracking resistance while maintaining mechanical properties, with specific formulations achieving a CTI rating of 250 volts or higher.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional fillers are added to polyetherimide to improve electrical tracking resistance, then electrical tracking resistance is improved, but material cost, processability, or mechanical properties are compromised

Engineering Contradiction:

Improveelectrical tracking resistanceVSAvoidprocessability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by introducing specific inorganic fillers (talc, titanium dioxide, zirconium oxide, aluminum oxide) at optimized concentrations (10-50 wt%). This parameter change achieves CTI ratings of 250V or higher while maintaining processability and mechanical properties, resolving the contradiction between electrical tracking resistance and ease of manufacture

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite materials by combining polyetherimide with multiple inorganic fillers in specific ratios. These composite compositions achieve superior electrical tracking resistance (CTI ≥250V) while preserving the base polymer's processability and mechanical characteristics, thus resolving the technical contradiction

Inventive Principle:

Principle #40Composite materials

2Reliability

If filler content is increased to improve electrical tracking resistance, then CTI rating improves, but mechanical properties deteriorate

Engineering Contradiction:

ImproveCTI ratingVSAvoidtensile strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent optimizes the filler content parameter within the range of 10-50 wt%, which is sufficient to achieve CTI ratings of 250V or higher without excessively compromising tensile strength. This optimized parameter range resolves the contradiction between improving CTI rating and maintaining mechanical strength

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent selects fillers with specific local properties (inorganic oxides with appropriate particle characteristics) that provide electrical tracking resistance while having minimal negative impact on mechanical strength. The localized selection of filler types and their surface properties helps maintain tensile strength even at 10-50 wt% loading levels

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10647815B2Electrical tracking resistance compositions, articles formed therefrom, and methods of manufacture thereof

Publication Date: 2020.05.12 SHPP GLOBAL TECH BV

AI summary

A composition comprises, based on the total weight of the composition, 50 wt % to 90 wt % of a polyetherimide; and 10 wt % to 50 wt % of a filler comprising talc, titanium dioxide, zirconium oxide, neutral aluminum oxide, or a combination comprising at least one of the foregoing; wherein the composition has a number of drops to tracking at 250 volts of greater than or equal to 50 drops determined according to ASTM D-3638-85.