Polyurethane encapsulated fertilizer
AssigneeFlorikan E.S.A. LLC
InventorsEdward Rosenthal, Leon Padgett
Life of this patent
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Abstract
A polyurethane encapsulated, slow release fertilizer with a coating based upon an isocyanate component and an isocyanate-reactive component comprising a polyether polyol. The process for producing such particles comprises applying an isocyanate-reactive component comprising a polyether polyol onto fertilizer particles to form coated fertilizer particles, applying an isocyanate component onto said coated fertilizer particles; and forming the polyurethane encapsulated fertilizer particles.
Claims25
A process for producing polyurethane encapsulated, slow-release fertilizer particles comprising:
- a) pre-sealing the fertilizer particles by applying a fine granular material and a vegetable oil to the particles
- b) applying an isocyanate-reactive component consisting essential of a polyether polyol onto fertilizer particles to form coated fertilizer particles;
- c) applying an isocyanate component onto said coated fertilizer particles of step a);
- and
- d) forming the polyurethane encapsulated fertilizer particles.
(canceled)
A coated fertilizer comprising:
- polyurethane encapsulated, slow release fertilizer particles comprising a coating of up to about eight percent of said coating by weight, wherein said coating releases nutrient from a nutrient substrate including potassium nitrate in the percentages of 12-0-43 (N-P-K) at rates comprising:
- from about 1,120 ppm to about 35,000 ppm of nitrogen at 100 degrees Fahrenheit in about one day;
- from about 5,200 ppm to about 74,000 ppm of nitrogen at 100 degrees Fahrenheit in about three days;
- and
- from about 10,500 ppm to about 104,000 ppm of nitrogen at 100 degrees Fahrenheit in about seven days.
(canceled)
Dependencies are inferred from the claim text.