Self-Inverting Reverse Latex Sequestering Agent

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Solution Overview

Problem

The evolution of European regulations necessitates an alternative sequestering agent for preparing self-inverting reverse latexes, as the pentasodium salt of diethylenetriaminepentaacetic acid is no longer suitable due to classification changes, and existing agents face challenges with metal ion contamination and polymerization inhibition.

Innovation Solution

A process for preparing a self-inverting reverse latex using a crosslinked anionic polyelectrolyte comprising monomers derived from 2-methyl-2-[(1-oxo-2-propenyl)amino] 1-propanesulfonic acid and ethylenediamine disuccinic acid as a sequestering agent, which effectively complexes metal ions and stabilizes polymerization reactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pentasodium salt of diethylenetriaminepentaacetic acid is used as a sequestering agent, then metal ion chelation is effective, but it is no longer suitable due to classification changes under European regulations

Engineering Contradiction:

Improvemetal ion chelation effectivenessVSAvoidregulatory compliance

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical parameters of the sequestering agent by using ethylenediamine disuccinic acid instead of the previously compliant pentasodium salt of diethylenetriaminepentaacetic acid. This substitution maintains metal ion chelation effectiveness while achieving compliance with evolving European regulations, demonstrating parameter change to resolve the contradiction between effectiveness and regulatory adaptability

Inventive Principle:

Principle #35Parameter changes

2Productivity

If existing sequestering agents are used, then polymerization can proceed, but metal ion contamination and polymerization inhibition occur

Engineering Contradiction:

Improvepolymerization rateVSAvoidpolymerization stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces ethylenediamine disuccinic acid as an intermediary sequestering agent that mediates between metal ions and the polymerization system. This intermediary effectively complexes metal ions that would otherwise inhibit polymerization, thereby maintaining both productivity and reliability of the polymerization process

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful effect of metal ion contamination into a beneficial process by using ethylenediamine disuccinic acid to chelate these metal ions. The previously harmful metal ions are transformed into bound complexes that no longer inhibit polymerization, thus converting a harmful factor into a controlled element of the system

Inventive Principle:

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

3Reliability

If deoxygenation is performed by purging with nitrogen, then polymerization initiation is improved, but an additional process step is required

Engineering Contradiction:

Improvepolymerization initiationVSAvoidprocess steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing deoxygenation of the reaction medium before initiating polymerization. By purging with nitrogen beforehand, the system is prepared to ensure reliable polymerization initiation without interference from oxygen, accepting the additional process step as a necessary preliminary preparation

Inventive Principle:

Principle #10Preliminary action

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 new process ensures consistent polymerization kinetics and thickening properties, overcoming the limitations of previous agents by providing effective metal ion chelation and stable polymerization, thus ensuring reproducible performance and compliance with evolving regulations.

Implementation Method 1

ethylenediamine disuccinic acid as a sequestering agent, which effectively complexes metal ions and stabilizes polymerization reactions

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

These polymers, once introduced into polar phases, have the property of deploying under the effect of electrostatic repulsions due to the presence of charges (negative and/or positive) on the polymeric skeleton

Methodology Applied

Scientific EffectElectrostatic repulsion: Electrostatics

Implementation Method 3

Aqueous phase rheology modifying polymers, mainly polyelectrolytes, result from the radical polymerization of (meth)acrylate monomers

Methodology Applied

Scientific EffectRadical polymerization: Photopolymerisation

Data Source

PatentEP4072687B1Process for preparing an reverse latex for cosmetic composition comprising a particular sequestering agent and a polyelectrolyte combining strong and weak acid function

Publication Date: 2024.02.14 SOC DEXPLOITATION DE PROD POUR LES IND CHEM SEPPIC

AI summary

Disclosed is a self-invertible inverse latex comprising an aqueous phase containing: a) a crosslinked anionic polyelectrolyte (P) consisting of: - at least one first monomer unit derived from 2-methyl-2-[(1-oxo-2-propenyl) amino] 1-propanesulfonic acid in the form of a free or partially or totally salified acid; - at least one second monomer unit derived from at least one monomer selected from the elements of the group consisting of acrylic acid, methacrylic acid, 2-carboxyethyl acrylic acid, itaconic acid, maleic acid, 3-methyl 3-[(1-oxo-2-propenyl) amino] butanoic acid, the carboxylic function of said monomers being in the free, partially salified or totally salified acid form; and - at least one third monomer unit derived from a polyethylenic crosslinking monomer (AR); b) ethylenediamine disuccinic acid in the form of trisodium salt.