Stable, clear, efficacious aqueous microemulsion compositions containing a high loading of a water-insoluble, agriculturally active chemical

An inert matrix composition suitable for forming a clear, efficacious, microemulsion concentrate including about 2-30% of a water-insoluble, agriculturally active chemical and, upon dilution of said concentrate with water, an aqueous microemulsion, both of which are stable for an extended period of time, consisting essentially of:

• (a) a C.sub.6 -C.sub.18 alkyl pyrrolidone in an amount of about 2-90% by weight of the composition less (c) and (d) if present, sufficient to form solvated micelles of the agriculturally active chemical;
• (b) a C.sub.1 -C.sub.4 alkyl pyrrolidone in an amount of about 1-90% by weight of the composition sufficient to complex with said C.sub.6 -C.sub.18 alkyl pyrrolidone and to solubilize said chemical in said micelles;
• (c) a nonionic surfactant having an HLB of .gtoreq.6 in an amount of about 2-90% by weight of the composition less (a) and (d) if present, sufficient to also complex with said C.sub.6 -C.sub.18 pyrrolidone to reduce said micelle size to about 0.005-0.5 microns thereby precluding disadvantageous leakage of said solvated chemical through said micelles;
• and
• (d) optionally, an anionic surfactant in an amount of 2-90% by weight of the composition less (a) and (c) to enhance the close-packing of the micelles thereby rendering the compositions more stable as evidenced by the presence of a clear, homogeneous liquid phase.