Pesticide or herbicide polymer complexes for forming aqueous dispersions
AssigneeISP Investments Inc.
InventorsKolazi S. Narayanan, Ratan K. Chaudhuri
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Abstract
Various liquid or low melting pesticide and herbicide formulations, previously formulated with organic solvents, are combined with a polymer in solution and co-precipitated to form a polymer complex which captures the pesticide or herbicide yet exists as a solid at ambient conditions. By preparing the pesticide or herbicide formulation as a solid complex, storage and handling of the formulation is possible without the potential for organic solvent emission. When the solid polymer complex is placed in water, a stable aqueous dispersion of the pesticide or herbicide is achieved as the polymer inhibits flocculation, with approximately 100% recovery of the pesticide or herbicide.
Claims13
A method for producing a solid insertion complex of a polymer and an active ingredient which provides a stable dispersion of the active ingredient in water comprising:
- providing a polymer having acid groups in a polymer matrix thereof for forming an insertion complex via hydrogen bonding with the active ingredient,
- dissolving the polymer in a solvent,
- dissolving the active ingredient in the polymer solvent solution, and
- co-precipitating the polymer and active ingredient as a solid insertion complex.
The method of providing a stable emulsion of an active ingredient in water comprising:
- preparing a solid insertion complex of the active ingredient with a polymer according to claim 20,
- adding the complex to water,
- dispersing the active ingredient into a stable emulsion, and substantially completely recovering the active ingredient in the water.
Dependencies are inferred from the claim text.