STP1449: An Examination of Interactions Between Various Dispersants and Other Surfactants in Wettable Powder Formulations

    Butler, BJ
    Market Manager, Clariant Corporation, Mt. Holly, NC

    Miller, DJ
    Group Leader, Physical Chemistry Lab, Research and Development Associate, and Global R&D Manager, Clariant GmbH, Werk Höchst, Frankfurt am Main,

    Sowa, C
    Group Leader, Physical Chemistry Lab, Research and Development Associate, and Global R&D Manager, Clariant GmbH, Werk Höchst, Frankfurt am Main,

    Zerrer, R
    Group Leader, Physical Chemistry Lab, Research and Development Associate, and Global R&D Manager, Clariant GmbH, Werk Höchst, Frankfurt am Main,

    Pages: 13    Published: Jan 2003


    Abstract

    The purpose of this study was to identify combinations of dispersants and wetting agents that may show broad utility in dry flowable formulations. The study tested four types of dispersants in combination with six types of wetting agents. Wettable powder formulations using four different active ingredients were made with either kaolin clay or silica as a diluent. Each test formulation was evaluated for suspensibility at 1 and 2 hours, with promising surfactant and diluent combinations being chosen based on maximum suspensibility as a function of time. Surface tension data for the surfactant combinations are also presented.

    The study demonstrated that diluent selection is important and influences the surfactant combination needed for adequate suspensibility. The study also revealed that certain combinations of surfactants show broad functionality. There was considerable variability in terms of surfactant requirements for adequate suspensibility as a function of the active ingredient, with some actives showing suitable suspensibility with a wide range or very narrow set of surfactant combinations.

    Keywords:

    WP, wettable powder, dispersant, suspensibility, wetting agent, surface tension, dynamic surface tension, sedimentation


    Paper ID: STP11192S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP11192S


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