Amide-Based Molecular Weight Controller for Polyamide

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Solution Overview

Problem

Conventional methods for producing polyamides through anionic polymerization face challenges in controlling molecular weight and achieving a narrow molecular weight distribution, especially due to basic intermediates and side reactions occurring at high temperatures.

Innovation Solution

The method involves using an amide-based molecular weight controller in an anionic polymerization reaction, specifically incorporating lactam, an alkali metal initiator, a compound represented by Formula 1 as a molecular weight controller, and carbon dioxide as an activator, to control the molecular weight and achieve a narrow distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional anionic polymerization is used to produce polyamide, then polymerization can proceed, but molecular weight increases due to basic intermediates and side reactions at high temperatures, resulting in broad molecular weight distribution

Engineering Contradiction:

Improvemolecular weight distributionVSAvoidmolecular weight control

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent introduces a molecular weight controller as an intermediary substance that selectively reacts with basic intermediates formed during anionic polymerization. This controller prevents unwanted side reactions and terminates polymer chains at controlled points, thereby achieving narrow molecular weight distribution while maintaining reliable molecular weight control throughout the polymerization process

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical parameters of the polymerization system by introducing specific molecular weight controllers with defined chemical structures and concentrations. This parameter modification allows precise control over molecular weight and distribution characteristics, transforming the uncontrolled high-temperature polymerization into a controlled process with predictable molecular weight outcomes

Inventive Principle:

Principle #35Parameter changes

2Productivity

If high-temperature polymerization condition is used to increase reaction rate, then productivity improves, but basic intermediates and side reactions increase, causing molecular weight to increase and distribution to broaden

Engineering Contradiction:

Improvepolymerization rateVSAvoidmolecular weight distribution

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The molecular weight controller acts as a mediator that selectively interacts with basic intermediates formed during high-temperature polymerization. By controlling the concentration and reactivity of these intermediates, the system maintains high polymerization rates while preventing the unwanted side reactions that would otherwise broaden molecular weight distribution

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful effect of basic intermediates formed at high temperatures into a beneficial control mechanism. The molecular weight controller exploits the presence of these intermediates to terminate polymer chains at desired lengths, transforming what would be a source of unwanted side reactions into a means of achieving precise molecular weight control and narrow distribution

Inventive Principle:

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

3Manufacturing precision

If molecular weight controller is added to control molecular weight, then distribution narrows, but additional components and process complexity are introduced

Engineering Contradiction:

Improvemolecular weight distributionVSAvoidpolymerization system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The molecular weight controller is designed as a consumable additive that is introduced in controlled amounts and consumed during the polymerization process. After performing its function of controlling molecular weight and distributing chain lengths, the controller is depleted and does not remain in the final polymer product, simplifying the overall system complexity despite adding functional capability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

This approach allows for easy control of polyamide molecular weight, preventing increases due to basic intermediates and side reactions, while also enabling an eco-friendly solvent-free process that produces polymers with uniform molecular weight and high conversion rates at low temperatures, thus improving productivity and reducing costs.

Implementation Method 1

lactam, and based on 100 parts by weight of the entire lactam, 0.01 parts by weight to 20 parts by weight of an alkali metal as an initiator

Methodology Applied

Scientific EffectAnionic polymerization:

Implementation Method 2

0.002 parts by weight to 7.0 parts by weight of an activator are included

Methodology Applied

Scientific EffectActivation reaction:

Data Source

PatentUS12215194B2Method for producing polyamide comprising amide-based molecular weight modifier, and polyamide produced thereby

Publication Date: 2025.02.04 HANWHA SOLUTIONS CORP

AI summary

Provided are a method for producing a polyamide including an amide-based molecular weight controller and a polyamide produced thereby, wherein the amide-based molecular weight controller may easily control the molecular weight of the polyamide to have a narrow molecular weight distribution so as to prevent an increase in the molecular weight due to a basic intermediate produced in anionic polymerization and a side reaction generated under a high-temperature polymerization condition.