Polyurethane encapsulated fertilizer, herbicide, insecticide or fungicide

Abstract From the Canadian patent

Disclosed is an encapsulated particle which includes a core particle. The core particle includes a fertilizer selected from the group of nitrogen phosphate, potash, and sulfur, and combinations thereof. The core particle may also include herbicides, insecticides, and fungicides. The encapsulated particle also includes a polyurethane, layer disposed about the core particle. The polyurethane layer includes the reaction, product of an aromatic isocyanate component and a polyol that is reactive with the, aromatic isocyanate component. The aromatic isocyanate component includes methylene diphenyl diisocyanate, toluene diisocyanate and mixtures thereof. , The, polyol that is reactive with the …