Water-based microemulsion formulations
AssigneeISP Investments Inc.
InventorKolazi S. Narayanan
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Abstract
Clear, stable, efficacious, aqueous microemulsions of a pyrethroid insecticide, optionally with another agriculturally active ingredient, are provided herein. The aqueous microemulsions are obtained by providing an inert matrix composition containing a defined mixture of nonionic surfactants, optionally including an anionic surfactant, mixing with a pyrethroid to form a microemulsion concentrate, and diluting with water. Preferably, the aqueous microemulsion includes an N-alkyl (C.sub.1 -C.sub.4) pyrrolidone therein as a cosolvent in the microemulsion system.
Claims11
An inert matrix composition for forming a clear, efficacious aqueous microemulsion upon admixture with a predetermined amount of a pyrethroid insecticide and water, which is stable at or below room temperature for an extended period of time, consisting essentially of a predetermined mixture of nonionic surfactants:
- (a) a C.sub.6 -C.sub.18 alkylpyrrolidone,
- (b) an alkyl phenol ethoxylated alcohol with HLB.gtoreq.6;
- and
- (c) an ethylene oxide/propylene oxide/ethylene oxide block copolymer,
- in a weight ratio of (a):(b):(c) of about 0.5-2:0.5-2:3-12.
A microemulsion concentrate for forming a clear, efficacious aqueous microemulsion of a pyrethroid insecticide upon dilution with water, which is stable at or below room temperature for an extended period of time, consisting essentially of:
- about 5-20% of a C.sub.6 -C.sub.18 alkylpyrrolidone,
- about 30-72% of an alkyl phenol ethoxylated alcohol with HLB.gtoreq.6,
- about 5-20% of an ethylene oxide/propylene oxide/ethylene oxide block copolymer, and
- about 0.5-20% of a pyrethroid insecticide, by weight of said concentrate.
Dependencies are inferred from the claim text.