Abstract: A controlled release fertilizer composition and methods to produce the controlled release fertilizer composition. The controlled release fertilizer composition includes a fertilizer core that is coated with a polymeric layer, such as polyurethane, that includes an organic carbonate additive.

Abstract: A nutrient or medicinal composition for administration to ruminants, which includes a core of one or more biologically active substances coated with a film of polyurethane, overcoated with an “intermediate” wax is disclosed. This polyurethane/wax coating is resistant to rumen conditions, but will release the biologically active substance(s) in the abomasum and subsequent digestive tract of the ruminant animal.

Abstract: A controlled release fertilizer composition and methods to produce the controlled release fertilizer composition. The controlled release fertilizer composition includes a fertilizer core that is coated with a polymeric layer, such as polyurethane, that includes an organic carbonate additive.

Abstract: A controlled release copper sulfate algaecide for controlling phytoplankton growth, including blue green algae is described. The controlled release algaecide includes a copper sulfate granule coated with at least one layer including a polyurethane which is a reaction product of a polymeric diisocyanate and a polyol.

Abstract: A nutrient or medicinal composition for administration to ruminants, which includes a core of one or more biologically active substances coated with a film of polyurethane, overcoated with an “intermediate” wax is disclosed. This polyurethane/wax coating is resistant to rumen conditions, but will release the biologically active substance(s) in the abomasum and subsequent digestive tract of the ruminant animal.

Abstract: A granular controlled-release pesticide comprising “core” granules such as ammonium sulfate, an inner polymer membrane formed in situ on said granules of ammonium sulfate, an acephate pesticide applied to the inner polymer membrane on the core granules, and an outer controlled-release polyurethane membrane formed in situ on said pesticide to permit controlled release of the pesticide.

Abstract: A granular controlled-release pesticide comprising “core” granules such as ammonium sulfate, an inner polymer membrane formed in situ on said granules of ammonium sulfate, an acephate pesticide applied to the inner polymer membrane on the core granules, and an outer controlled-release polyurethane membrane formed in situ on said pesticide to permit controlled release of the pesticide.

Abstract: The present invention described a polymer coated fertilizer, such as urea, subsequently coated with a layer of sulfur and thereafter a further coating of polymer. Preferably, the polymer coatings are formed by the direct in situ co-polymerization of the components of the polymer on the fertilizer and on the sulfur coating. The compositions provide positive controlled release characteristics, are abrasion and impact resistant and are substantially more economical to produce than polymer coated fertilizers.

Abstract: Open-ended pores of a porous granule are filled with a liquid material which is at least partially immiscible with water, and sealed with a porous polyurea membrane which limits the release rate of the material into the surrounding medium. The membrane is formed by(a) applying to the bare granule an organic solution comprising the liquid material and an organic polyisocyanate, followed by(b) applying to the granule an aqueous solution comprising water and a catalytic amount of a catalyst selected from the group consisting of a basic organic tertiary amine and an alkyl tin carboxylate.