Aqueous delivery systems for water soluble agricultural actives using polymeric dispersants
View Patent ↗What is described herein is an aqueous dispersion for coating water-soluble granules of a water soluble active agricultural chemical to substantially increase the rain fastness of the active. The dispersion includes by wt. (a) at least 0.1% of a polymeric anionic dispersing agent, (b) 5–30% of a water-insoluble, natural or synthetic inorganic or organic polymer, and (c) to 100% of water.
1. An aqueous dispersion for coating water-soluble granules of a water soluble active agricultural chemical to substantially increase the rain fastness of said active, comprising, by wt
(a) at least 0.1% of a polymeric anionic dispersing agent which is an olefin-maleic acid/ester condensate partially neutralized, or copolymers thereof,
(b) 5–30% of lignin or talc, and
(c) to 100% of water.
2. The dispersion of claim 1 which is dried to a powder.
3. A granule of a water soluble active agricultural chemical which exhibits substantially increased rain fastness coated with the dispersion of claim 1 to provide 0.1–5 parts of (b) on 100 parts of the granule.
4. A granule according to claim 3 wherein said active is a commercial fertilizer.
5. A granule according to claim 4 wherein said active is urea.
6. A granule according to claim 3 wherein said active is a soil nutrient.
7. A granule according to claim 3 which has a 20% reduction in wash off of said active after a one inch rain fall as compared to an uncoated granule.