Controlled release fertilizer composition
AssigneeAgrium Inc.
InventorsJeffrey Michael Ogle, Johnny Duran Sims
Life of this patent
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Abstract
A controlled release fertilizer composition and methods to produce the controlled release fertilizer composition are described. The controlled release fertilizer composition comprises a water soluble fertilizer core that is coated with a polymeric layer, intermediate layer, and a sulfur layer. If desired, the sulfur layer can be coated with an outer water-insoluble layer.
Claims28
A controlled release fertilizer composition, comprising:
- a) a core comprising one or more plant nutrient materials;
- b) a polymer layer coating the core, wherein the polymer layer comprises a polymer formed on the core from two or more precursor compounds;
- c) a sulfur layer overlying the polymer layer;
- d) an intermediate layer between the polymer layer and the sulfur layer, wherein the intermediate layer functions as a lubricant when applying the sulfur layer;
- and
- e) optionally an outer, water-insoluble layer.
A controlled release fertilizer composition, comprising:
- a) a core comprising one or more plant nutrient materials;
- b) a polymer layer coating the core, wherein the polymer layer comprises a polymer formed on the core from two or more precursor compounds;
- c) a sulfur layer overlying the polymer layer;
- d) an intermediate layer coated between the polymer layer and the sulfur layer, wherein the intermediate layer comprises a lubricant;
- and
- e) optionally an outer, water-insoluble layer.
A method of producing a controlled release fertilizer composition, comprising the steps of:
- a) coating one or more plant nutrient materials with two or more precursor compounds under conditions effective to form a polymer layer coating a core comprising the one or more plant nutrient materials;
- b) coating a lubricant onto the polymer layer;
- c) applying molten sulfur onto the lubricant under conditions effective to form a sulfur layer comprising solidified sulfur;
- and
- d) optionally applying an outer layer onto the sulfur layer.
A method of producing a controlled release fertilizer composition, comprising the steps of:
- a) coating a lubricant onto a particle comprising a polymer layer that coats a core comprising at least one plant nutrient material;
- b) coating molten sulfur onto the lubricant under conditions such that the lubricant helps the molten sulfur form a more uniform sulfur coating comprising solidified sulfur.
A method of producing a controlled release fertilizer particle comprising the steps of:
- a) coating one or more plant nutrients with two or more than two precursor compounds reactive to form a polyurethane polymer layer;
- b) applying a lubricant onto the polymer layer;
- c) spraying molten elemental sulfur onto the lubricant to form a sulfur layer;
- and
- d) applying a wax layer onto the sulfur layer to form the controlled release fertilizer particle.
Dependencies are inferred from the claim text.