The invention is directed to a pesticide composition comprising free flowing, essentially spherical, water-dispersible granules wherein said water-dispersible granules are from about 150 to about 850 microns in diameter; wherein said granules contain up to about 8.0% by weight moisture; wherein each individual water-dispersible granule is an aggregation of individual spherical microcapsules which contain at least one water-insoluble pesticide within a polymeric shell wall; and wherein said water-dispersible granule disintegrates upon contact with water to release said individual microcapsules.
The invention also relates to dry flowable pesticidal formulations of the above water-dispersible granules, together with formulation adjuvants.
The invention is further directed to a process for preparing a water-dispersible granule comprising:
(a) forming an aqueous suspension comprising discrete microcapsules containing at least one water-insoluble pesticide within a polymeric shell wall suspended in an aqueous liquid; and
(b) forming droplets of said aqueous suspension and spray drying said droplets to form essentially spherical water-dispersible granules which are from about 150 to about 850 microns in diameter and which contain up to about 8.0% moisture, wherein each water-dispersible granule is an aggregation of said microcapsules.
本发明涉及一种农药组合物,该组合物包含自由流动的、基本为球形的
水分散粒剂,其中所述
水分散粒剂的直径约为 150 至约 850 微米;所述粒剂含有高达约 8.0%(重量)的
水分;其中每个
水分散粒剂是单个球形微胶囊的聚集体,在聚合物壳壁内含有至少一种
水不溶性农药;以及其中所述
水分散粒剂在与
水接触时崩解,释放出所述单个微胶囊。
本发明还涉及上述
水分散粒剂的干燥可流动农药制剂,以及制剂佐剂。
本发明还涉及一种制备
水分散粒剂的工艺,包括
(a) 形成
水性悬浮液,该悬浮液由离散的微胶囊组成,微胶囊的聚合物壳壁中至少含有一种
水不溶性农药,悬浮在
水性液体中;以及
(b) 形成所述
水性悬浮液的液滴,并喷雾干燥所述液滴,以形成直径约 150 至约 850 微米且含
水量高达约 8.0%的基本球形
水分散粒剂,其中每个
水分散粒剂都是所述微胶囊的聚集体。