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US 12,371,393 B2Granted
Controlled-release fertilizer compositions
AssigneeOMS Investments, Inc.
InventorKwame Owusu-Adom
Life of this patent
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Abstract
A controlled-release fertilizer composition includes coated fertilizer particles having granules substantially encapsulated with a polyurethane coating layer formed from cardanol-based polyols and an isocyanate curing agent. Methods of making and using the controlled-release fertilizer compositions are also disclosed.
Claims15
A controlled-release fertilizer composition comprising:
- a plurality of coated fertilizer particles each consisting of a granule, four or more polyurethane coating layers, and optionally a wax coating layer, wherein the four or more polyurethane coating layers substantially encapsulate the granule and the innermost layer of the four or more polyurethane coating layers contacts the granule;
- and
- wherein the four or more polyurethane coating layers are formed from the reaction product of a polyol composition and an isocyanate curing agent;
- wherein the polyol composition comprises a hydrophobic cardanol-based polyol and an aromatic amine-based polyol;
- wherein the granule consists of urea.
2 more elements
A method of making a controlled-release fertilizer composition comprising:
- coating granules consisting of urea with a polyol composition;
- and
- applying an isocyanate curing agent to the polyol composition to form an initial polyurethane coating layer substantially encapsulating each granule, the initial polyurethane coating layer contacting the granule;
- forming three or more additional polyurethane coating layers overlying the initial polyurethane coating layer;
- and
- wherein the polyol composition is miscible with the isocyanate curing agent;
- wherein the polyol composition comprises a hydrophobic cardanol-based polyol and an aromatic amine-based polyol;
- and
- wherein the controlled-release fertilizer composition consists of the granule, four or more polyurethane coating layers, and optionally a wax coating.
6 more elements
Dependencies are inferred from the claim text.