There is provided a composition comprising clomazone encapsulated within microcapsules having a polymer wall comprising a cross-linked polyacetylene carbamide-polyurea. A preferred composition is prepared by providing a water imiscible organic phase comprising clomazone, one or more polyfunctional isocyanates and a cross-linking resin providing an aqueous phase comprising one or more polyfunctional amines dispersing the organic phase in the aqueous phase to form a dispersion of droplets of the organic phase in the aqueous and allowing the formation of a polyacetylene carbamide-polyurea polymer at the interface of the dispersed organic phase and the aqueous phase. The composition is useful in the control of plant growth.本發明提供一種含有封裝於微膠囊的可滅蹤之組合物,其中微膠囊的聚合物壁含有交聯聚乙炔脲-聚脲。較佳之組合物的調製方法如下:預備包含可滅蹤、一種及多種多官能異氰酸脂及一種交聯樹脂的與水不混溶有機相;預備包含一種或多種多官能胺的水相;把有機相分散於水相,以形成有機相液滴於水相之分散體;從而令分散有機相及水相的界面產生聚乙炔脲-聚脲聚合物。此組合物對控制植物生長有用。
