KR927002910A - Method for producing sustained release granules - Google Patents

Abstract

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Description

Method for producing sustained release granules

[Brief Description of Drawings]

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Claims (22)

Agrochemicals and polyhydroxylated compounds, mixtures of polyhydroxylated compounds, granular carriers containing water and one or more polyhydroxylated compounds, or water, are mixed with liquid polyisocyanates or polyisosanates and optionally with polymerization catalysts. A method for producing a ready-to-use sustained-release granular pesticide consisting essentially of obtaining a cross-linked solid polyurethane or polyurea barrier by interfacial polymerization by top coating. The method of claim 1 wherein said reaction occurs at elevated temperature. The method of claim 1 wherein said pesticide is a herbicide or an insecticide. 4. The method of claim 3, wherein the herbicide is selected from sulfonylureas, imidazolinones, uracils, dinitroanilines, and the pesticide is phosphorothioate. The method of claim 1 wherein said granular carrier is selected from sand or aggregated clay. 6. The method of claim 5, wherein the granular carrier is about 150 to 4,000 microns in size. The method of claim 1, wherein the polyhydroxylated compound is selected from ethylene glycol or propylene glycol. The method of claim 1 wherein said polyisocyanate is methylene-linked polyphenylisocyanate. The method of claim 1 wherein said polyisocyanate is toluene diisocyanate. The method of claim 1 wherein said polyisocyanate is a mixture of methylene-linked polyphenylisocyanate and toluene-2,4-diisocyanate. The process of claim 1 wherein said polymerization catalyst is selected from organic tertiary amines and alkyltin carboxylates. The amount of polyisocyanate and polymerization catalyst used in the polyisocyanate or polyisocyanate mixture and polymerization catalyst at a temperature above ambient temperature in granules containing pesticides and water or polyhydroxylated compounds or mixtures thereof is about 1 to 20% by weight, respectively. And interfacial polymerization reaction by adding 0 to 5% by weight to obtain a cross-linked solid polyurethane or polyurea barrier in which the amount of the water or polyhydroxylated material is present in an amount to which all polyisocyanates can react. A method for producing a usable sustained release granular pesticide consisting essentially of. The method of claim 10, wherein the reaction time is about 20 to 30 minutes. The method of claim 10 wherein said pesticide is a herbicide. 13. The method of claim 12, wherein the herbicide is selected from sulfonylureas, imidazolinones, uracils, or dinitroanilines. The method of claim 10 wherein said pesticide is an insecticide. The method of claim 10, wherein the pesticide is phosphorothioate. The method of claim 10, wherein the granular carrier is selected from sand or coarse clay. The method of claim 14, wherein the granular carrier is about 150 to 4,000 microns in size. The method of claim 10, wherein the polyhydroxylated compound is selected from ethylene glycol or propylene glycol. The method of claim 10 wherein said polyisocyanate is methylene-linked polyphenylisocyanate or toluene diisocyanate or mixtures thereof. The process of claim 10 wherein said polymerization catalyst is selected from organic tertiary amines and alkyltin carboxyesters. ※ Note: This is to be disclosed by the original application.