Stable, clear, efficacious aqueous microemulsion compositions containing a high loading of a water-insoluble, agriculturally active chemical
US5300529A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1993 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Jan 26, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2557/242
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An Inert Matrix Composition (IMC) is provided for forming a stable, clear, efficacious Microemulsion Concentrate (MEC) including about 2-30%, preferably 5-25%, by weight of the composition, of a water-insoluble Agriculturally Active Chemical (AAC). Upon dilution of the concentrate with water, an Aqueous Microemulsion (AME) is provided. The IMC consists essentially of: PA1 (a) a C.sub.6 -C.sub.18 alkyl pyrrolidone in an amount sufficient to form micelles of the AAC solvated in water; PA1 (b) a C.sub.1 -C.sub.4 alkyl pyrrolidone in an amount sufficient to complex with said C.sub.6 -C.sub.18 alkyl pyrrolidone and to solubilize the AAC in the micelles; PA1 (c) a nonionic surfactant having an HLB of .gtoreq.6 in an amount sufficient to complex with the C.sub.6 -C.sub.18 alkyl pyrrolidone to reduce the micelle size to about 0.005-0.5 microns, preferably 0.01-0.1 microns, thereby precluding disadvantageous leakage of the solvated AAC through the micelles; and PA1 (d) optionally, an anionic surfactant 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. In the MEC, the weight ratio of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.