STP1268

    Superior Multipurpose Adjuvant System for Rainfastness and UV Protection

    Published: Jan 1996


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    Abstract

    Many pesticides of both synthetic and biological origin undergo UV-induced photodegradation, resulting in reduced efficacy. Efficacy can also be reduced by rain washoff of the active ingredient. A tank mix additive (adjuvant) which functions as a UV protectant and rainfast agent would provide improved pest control for problematic a.i.'s. Adjuvant systems which could be directly incorporated into the formulated pesticide, will provide a superior, value added product. Agrimax 33 (International Specialty Products) is a proprietary, multipurpose adjuvant composition designed to offer rainfastness for pesticides. It is composed of pyrrolidone-based solvents, surfactants, and water insoluble polymers microdispersed in aqueous medium. The composition can be diluted in all proportions without phase separation. A number of water insoluble UV protectants (Table 1) have been solubilized in Agrimax 3 at levels approaching 30% (w/w). Some of these systems produced stable emulsions on dilution with water, with particle size in the 0.02 μm – 2.0 μm range. Such systems can be used for UV protection. These adjuvants have been successfully incorporated into several active pesticides via lyophilization to yield a rainfast product. In the UV protecting adjuvants described here, Agrimax 3 acts as a carrier for the hydrophobic UV protecting molecules. The spectral data for the UV protectants, the stability of the adjuvant compositions are discussed. A physico-chemical model for the total adjuvant system is presented.

    Keywords:

    UV protection, rainfastness, adjuvants, Agrimax 3, microdispersion, Escalol, ®, 507 [2-ethylhexyl p-dimethylamino benzoate], Escalol, ®, 567 [2-hydroxy-4-methoxy benzophenone], Escalol, ®, 557 [2-ethylhexyl p-methoxycinnamate], Escalol, ®, 597 [2-ethylhexyl-2-cyano-3,3-diphenyl acrylate], N-alkyl pyrrolidone, anionic surfactants, amphoteric polymers, UV spectra, particle size distribution, stability, viscosity, and conductance


    Author Information:

    Narayanan, KS
    Research Fellow, Agricultural Products, International Specialty Products, Wayne, NJ

    Ianniello, RM
    Vice President, Research and Development, Stephens Scientific, Riverdale, NJ


    Paper ID: STP16041S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP16041S


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