Self-Inverting Inverse Latex Using Ethylenediamine Disuccinic Acid
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Solution Overview
Problem
The evolution of European regulations necessitates an alternative sequestering agent for the preparation of 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 reproducibility and contamination issues.
Innovation Solution
A process for manufacturing self-inverting reverse latex using a crosslinked anionic polyelectrolyte comprising monomers like acrylic acid and ethylenediamine disuccinic acid in the form of trisodium salt, with specific polymerization steps and surfactant systems to ensure effective thickening and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pentasodium salt of diethylenetriaminepentaacetic acid is used as a sequestering agent, then metal ion chelation is effective, but regulatory compliance deteriorates due to classification changes
Solution Approach 1:
The patent changes the chemical structure parameters of the sequestering agent by replacing the pentasodium salt of diethylenetriaminepentaacetic acid with ethylenediamine disuccinic acid in the form of trisodium salt. This structural modification maintains the metal ion chelation effectiveness while achieving regulatory compliance, as the new compound has different classification status under European regulations
Solution Approach 2:
The patent adopts a new sequestering agent that is more readily available and easier to source consistently than the previous pentasodium salt, which had become restricted. The ethylenediamine disuccinic acid trisodium salt represents a more accessible, short-term solution that meets current regulatory requirements without long-term supply chain concerns
2Reliability
If traditional sequestering agents are used, then metal ion binding is achieved, but polymerization reproducibility deteriorates due to contamination and variability
Solution Approach 1:
The patent modifies the sequestering agent parameters by selecting ethylenediamine disuccinic acid trisodium salt with specific purity specifications (≥98%). This parameter change reduces variability in metal ion binding and eliminates contamination issues that affected polymerization reproducibility with traditional agents
Solution Approach 2:
The patent implements preliminary purification steps including filtration through 0.22 µm membranes and activated carbon treatment before polymerization. These preliminary actions remove potential contaminants from the sequestering agent and other components, ensuring consistent polymerization results without metal ion interference
3Ease of manufacture
If radical polymerization is performed without deoxygenation, then process simplicity is maintained, but polymerization kinetics deteriorate due to oxygen inhibition
Solution Approach 1:
The patent implements preliminary nitrogen purging of the reaction system before initiating polymerization. This preliminary action removes oxygen from the headspace and dissolved phases, eliminating inhibition effects and ensuring consistent polymerization kinetics without requiring complex continuous deoxygenation equipment
Solution Approach 2:
The patent uses nitrogen gas as an intermediary substance to displace oxygen from the polymerization system. The nitrogen acts as an inert atmosphere that prevents oxygen radical formation and interference with the polymerization process, maintaining both simplicity and productivity
Data Source
AI summary
The invention relates to a self-invertible inverse latex having an aqueous phase, comprising: a) a cross-linked anionic polyelectrolyte (P) consisting of: - at least one first 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 monomer unit derived from a polyethylenic cross-linking monomer (AR); b) ethylenediamine disuccinic acid in the form of trisodium salt.