Polyamide Oligomer End Group Control for Melt Stability

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Solution Overview

Problem

Polyamide oligomers with high residual reactive end groups can lead to decomposition and cross-linking issues in thermoplastic materials, affecting their stability and properties.

Innovation Solution

Development of polyamide oligomers with controlled molar mass between 800 to 5000 g/mol, characterized by a low concentration of free COOH groups and a higher concentration of NH2 end groups, ensuring essentially non-reactive end groups and improved stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If polyamide oligomers with high residual reactive end groups are used, then they can participate in condensation reactions and cross-linking, but they cause decomposition and cross-linking issues in thermoplastic materials, affecting stability

Engineering Contradiction:

ImprovereactivityVSAvoidstability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the chemical parameter of end groups by replacing reactive COOH groups with non-reactive alkyl radicals, thereby reducing reactivity while maintaining stability in thermoplastic materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts and removes the harmful reactive end groups (COOH) from the oligomer structure, replacing them with inert alkyl radicals that do not participate in unwanted condensation reactions

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If oligomers with reactive end groups are used for special tasks like wetting and adhesion, then they can react with surfaces and fillers, but they lead to decomposition and viscosity degradation in the melt

Engineering Contradiction:

Improvewetting and adhesionVSAvoidmelt stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by providing specific functionality (wetting and adhesion) through the oligomer chain structure while keeping the end groups non-reactive, thereby achieving surface interaction without bulk decomposition

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the potentially harmful reactive end groups into beneficial non-reactive alkyl radicals that prevent decomposition while the oligomer body maintains its wetting and adhesion properties

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If polyamide oligomers with COOH end groups are used to achieve good wetting and adhesion, then they can interact with surfaces, but they cause decomposition and cross-linking that affects long-term stability

Engineering Contradiction:

Improvewetting performanceVSAvoidlong-term stability

Core Design Contradiction:

Manufacturing precisionVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical nature of end groups from reactive COOH to non-reactive alkyl radicals, maintaining wetting performance through the oligomer structure while eliminating long-term decomposition issues

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7786222B2Polyamide oligomers and their use

Publication Date: 2010.08.31 EMS CHEM AG

AI summary

The present invention relates to polyamide oligomers with linear or branched chain structure with a number average molar mass of 800 to 5000 g/mol, with basic end groups which are at least partially NH2 end groups and carboxyl end groups, produced by condensation of polyamide-forming monomers, the concentration of NH2 end groups being at most 300 mmol/kg and in that these end groups are present in excess in a ratio to the carboxyl end groups.