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Methyl esters of fatty acids were evaluated under laboratory conditions as cosolvents with soybean oil in pesticidal concentrates. Concentrates containing methyl esters showed reduced viscosities and pour points, and improved low-temperature solubility of the active ingredients, in comparison with concentrates employing soybean oil alone as the solvent. The relative benefits derived from the methyl ester varied with the structure and composition and with the pesticide being formulated. Emulsification of concentrates with and without methyl ester were compared, and were found to be equivalent. The viscosity and pour point of soybean oil alone were also found to be reduced by addition of methyl esters, suggesting the possibility of modifying these properties in applications such as crop oils and carrier oils. With some methyl esters, pour points of blends with soybean oil were lower than those of either the methyl ester or the soybean oil alone.
methyl ester, soybean oil, viscosity, pour point, warming pour point, insecticide, emulsion
Product Specialist, Stepan Company, Northfield, IL