SYMPOSIA PAPER Published: 01 April 2025
STP165220240008

Polymeric Dispersants Synergy in Metribuzin and Sulfentrazone SC Formulations

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Pesticide formulations in the form of suspension concentrates (SCs) play a vital role in agricultural practices, offering efficient delivery of active ingredients while ensuring uniform application. However, the dispersion and stability of the pesticide particles within the SC formulation can be challenging, especially when formulating high loads of slightly water-soluble active ingredients. In addition, the use of multiple active ingredients increases the complexity of stabilizing diversified SC formulations. To address this issue, the present study investigated the synergistic effect of using two different polymeric dispersants in SC formulations. The formulations in turn exhibit enhanced efficacy, reduced environmental impact, and increased sustainability. The polymeric dispersants were selected based on their unique structural properties and dispersing capabilities—one having an aliphatic backbone with pendant ethoxylate chains and the other having an aromatic backbone with pendant amide alkoxylate chains Both provide improved stability and particle suspension characteristics, and both aid in minimizing agglomeration formation. This study evaluated the combined effect of these dispersants on the dispersion and physical stability of pesticide in SC formulations. The formulations were subjected to comprehensive characterization, including analysis of particle size, viscosity, pH, and suspensibility, as well as visual observation of sedimentation and creaming behavior. The stability study was conducted over an extended period at various temperatures to simulate extended stability. Results demonstrated that the combination of dispersants exhibited a synergistic effect, enhancing the dispersion stability of pesticide SC formulations through improved particle size reduction, reduced agglomeration, and prolonged suspension stability. The findings of this study have important implications for the formulation of pesticide SCs, offering a novel approach to enhancing dispersion stability and optimizing the performance of pesticide formulations.

Author Information

Jabri, Mina
Indorama Ventures Indovinya—Crop Solutions, The Woodlands, TX, US
Villarreal, Humberto, Javier
Indorama Ventures Indovinya—Crop Solutions, The Woodlands, TX, US
Kitano, Isabella
Indorama Ventures Indovinya—Crop Solutions, BR
Garofalo, Juliane
Indorama Ventures Indovinya—Crop Solutions, BR
Ferguson, Dave
Indorama Ventures Indovinya—Crop Solutions, The Woodlands, TX, US
Mai, Anthony, Q.
Indorama Ventures Indovinya—Crop Solutions, The Woodlands, TX, US
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Pages: 120–133
DOI: 10.1520/STP165220240008
ISBN-EB: 978-0-8031-7752-9
ISBN-13: 978-0-8031-7751-2