Method for the manufacture of slow-release fertilizers
First Claim
1. A method for the manufacture of physically prepared slow-release fertilizers wherein fertilizer particles are coated by at least one layer of a substantially water-insoluble polymer possessing a three-dimensional structure, resulting from the crosslinking at a temperature in the range of 160°
- C. to 180°
C. of a prepolymerized crosslinked unsaturated oil having between 12 to 20 carbon atoms and an iodine value of at least 120, the extent of crosslinking being above 5% gel, wherein catalysts and crosslinking agents are added during the crosslinking polymerization.
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Abstract
A method for the manufacture of physically prepared slow-release fertilizer by coating fertilizer particles with at least one layer of a substantially water insoluble polymer possessing a three dimensional structure. The three dimensional structure results from a prepolymerized crosslinked unsaturated oil having between 12 to 20 carbon atoms and a iodine value of at least 120, the extent of crosslinking being above 5%. Optionally, the coating layer contains micronutrients and inert materials. In a preferred embodiment, the coating consists of three layers, the first being obtained with a high viscous unsaturated oil and the subsequent two layers with a lower viscosity unsaturated oil. The method is applicable for most of the known water-soluble fertilizers.
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14 Claims
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1. A method for the manufacture of physically prepared slow-release fertilizers wherein fertilizer particles are coated by at least one layer of a substantially water-insoluble polymer possessing a three-dimensional structure, resulting from the crosslinking at a temperature in the range of 160°
- C. to 180°
C. of a prepolymerized crosslinked unsaturated oil having between 12 to 20 carbon atoms and an iodine value of at least 120, the extent of crosslinking being above 5% gel, wherein catalysts and crosslinking agents are added during the crosslinking polymerization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- C. to 180°
Specification