Polyetherimide Composition Impact Strength Flame Retardancy

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Solution Overview

Problem

Polyetherimide compositions used in additive manufacturing exhibit inadequate impact strength while maintaining flame retardancy, as adding impact modifiers often compromises flame retardancy.

Innovation Solution

A polyetherimide composition comprising 40-60% polyetherimide, 15-50% block polyestercarbonate, 5-15% block polycarbonate-polysiloxane, and 1.5-7% core-shell impact modifier with a polysiloxane core and poly(alkyl (meth)acrylate shell, which enhances impact strength without significantly reducing flame retardancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If impact modifiers are added to polyetherimide compositions to increase impact strength, then impact strength is improved, but flame retardancy is substantially degraded

Engineering Contradiction:

Improveimpact strengthVSAvoidflame retardancy

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by introducing specific block copolymers (block polyestercarbonate with resorcinol ester units, block polycarbonate-polysiloxane) that have distinct molecular structures and properties. These parameter changes allow the composition to achieve both high impact strength and maintained flame retardancy, resolving the contradiction between improving impact strength and preserving flame retardancy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining polyetherimide with multiple block copolymers and a core-shell impact modifier. This composite approach allows synergistic effects where the block copolymers provide toughness and impact resistance while the polyetherimide matrix maintains flame retardancy, thus resolving the technical contradiction

Inventive Principle:

Principle #40Composite materials

2Strength

If core-shell impact modifier is added to improve impact strength, then impact strength is significantly improved, but processing parameters must be optimized to maintain material stability

Engineering Contradiction:

Improveimpact strengthVSAvoidprocessing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent specifies precise parameter ranges for the core-shell impact modifier (1.5-7 weight percent) and defines specific composition ranges for all components. These parameter optimizations ensure that the complex multi-component system can be processed effectively while achieving the desired impact strength improvement, resolving the contradiction between performance enhancement and processing complexity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10882956B2Polyetherimide composition and associated article and additive manufacturing method

Publication Date: 2021.01.05 SHPP GLOBAL TECH BV

AI summary

A polyetherimide composition includes specific amounts of a polyetherimide, a block polyestercarbonate, a block poly-carbonate-polysiloxane, and a core-shell impact modifier in which the core includes a polysiloxane and the shell includes a poly(alkyl (meth)acrylate). Relative to a corresponding composition lacking the core-shell impact modifier, the polyetherimide composition exhibits increased impact strength while substantially retaining flame retardancy. Also described are associated articles, including articles formed by additive manufacturing, and a method of additive manufacturing.