A granular agrochemical composition is disclosed including a granular core material having a water soluble portion with a first coating layer applied on the surface of the core material and a second coating layer applied on the surface of the first coating layer. The first coating layer includes a wax composition having a biologically active ingredient incorporated therein and the second coating layer includes a polymeric composition.; The granular agrochemical composition exhibits a controlled rate of release of the biologically active ingredient therefrom over a period greater than about 30 days from the date of initial exposure of the granular composition to moisture whereby essentially all of the biologically active ingredient incorporated in the wax material of the first coating layer is released from the granular composition before the water soluble portion of the granular core material is released from the granular composition.
本发明公开了一种颗粒状农用
化学品组合物,包括一种颗粒状芯材,芯材具有
水溶性部分,芯材表面涂有第一涂布层,第一涂布层表面涂有第二涂布层。颗粒状农用
化学品组合物显示出
生物活性成分从颗粒状组合物中释放的可控速率,从颗粒状组合物最初暴露于湿气之日起超过约 30 天的时间内,颗粒状组合物中的
生物活性成分基本上全部从第一涂布层的蜡材料中释放出来,然后颗粒状芯材的
水溶性部分才从颗粒状组合物中释放出来。