04711659 is referenced by 59 patents and cites 10 patents.

An attrition resistant controlled release fertilizer comprising: NH.sub.2 -containing water soluble central particles such as urea, surrounded and chemically bonded with a base coating, consisting of substituted ureas, formed by reacting a molecular excess of polyfunctional isocyanate with the NH.sub.2 groups of the central particles, and a water insoluble layer, surrounding and chemically bonded with the base coating, formed by the reaction and polymerization of the excess isocyanate with anhydrous organic polyols. If desired, 1 to 10 water insoluble coatings may surround the sealing layer. The base coating's substituted ureas may be effectively formed with diphenylmethane diisocyanate and the sealing layer, with polyethyleneterephthalate polyester polyols containing triethanolamine or melamine catalyst. Central particles effectively coated include: urea, biuret, ureaform, guanidine, melamine, and ammonium salts. A preparation method is provided.

Title
Attrition resistant controlled release fertilizers
Application Number
6/897160
Publication Number
4711659
Application Date
August 18, 1986
Publication Date
December 8, 1987
Inventor
William P Moore
P.O. Box 1270, Hopewell, 23860
VA, US
IPC
C05C 9/00
A01N 43/64
A01N 43/48
A01N 37/38
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