Process for the preparation of sulfur coated fertilizers and...

Details Process for the preparation of sulfur coated fertilizers and... Process for the preparation of sulfur coated fertilizers and...

C - Chemistry, Metallurgy

05

G

C05G 5/00 (2006.01) C05C 9/00 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2164986

Extended residual, controlled please sulfur coated fertilizers having polymeric topcoats applied over a sulfur coating layer are prepared wherein the sulfur coating contains a sufficient amount of a crystalline sulfur allotrope in combination with at least a minimal level of carbon disulfide insoluble amorphous sulfur to maintain the sulfur coating in a pliable, resilient condition at the time at which the polymeric topcoat is applied over the sulfur coating. The presence of such sulfur allotrope is demonstrated by a shoulder endotherm appearing on a differential scanning calorimetry thermogram within a transition temperature range of about 84 °C - 97 °C.

Engrais à libération résiduelle lente et prolongée, revêtus d'une couche de soufre par-desus laquelle est appliquée une couche finale polymérique. Le revêtement de soufre contient un allotrope de soufre cristallin en quantité suffisante, qui est combiné avec au moins une quantité minimale de soufre amorphe insoluble sous forme de sulfure de carbone afin de maintenir ce revêtement dans un état souple et élastique au moment où la couche finale polymérique est appliquée. La présence de cet allotrope de soufre est mise en évidence par la forme en épaule de la courbe qui caractérise les propriétés endothermiques sur le thermogramme de l'analyse calorimétrique différentielle, pour une température de transition comprise entre 84 DEG C et 97 DEG C.

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