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    Using Nonionic Surfactants in Aqueous Formulations

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    Water-based formulations for liquid actives are relatively new to the agricultural market. Surfactant combinations have been identified which provide long-term stability and good dilution characteristics in concentrated emulsions (oil-in-water emulsions [EW]) and suspoemulsions (combinations of a liquid and solid active in a water-based formulation). For EW formulations, surfactant combinations consist of two nonionic EO/PO block copolymers. One has relatively hydrophobic character containing little EO and acts as emulsifier, while a relatively hydrophilic component with a large EO content facilitates dispersion in water. Suspoemulsions are stabilized by adding block copolymers containing 30 to 50% EO to commercial flowables. Some formulations require additional polyacrylate polymer as dispersant. These stable formulations are made without any thickeners or other stabilizers.

    EW formulations have been demonstrated with pyrethroids and 2,4-dichlorophenoxyacetic acid. Combinations of malathion/carbaryl and metolachlor/atrazine have been successfully formulated in suspoemulsions. The physical stability and dilution characteristics of the formulations are described.


    emulsions, suspension concentrates, dispersion, block copolymers, pyrethroids

    Author Information:

    Utz, CG
    Group Leader, BASF Corporation, Wyandotte, MI

    Drewno, GW
    Technical Specialist, BASF Corporation, Wyandotte, MI

    Hollis, RP
    Market Development Specialist, BASF Corporation, Parsippany, NJ

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP20188S