Precoated controlled release fertilizers and processes for...

Details Precoated controlled release fertilizers and processes for... Precoated controlled release fertilizers and processes for...

A - Human Necessities

01

N

A01N 25/08 (2006.01) A01N 25/10 (2006.01) C05C 9/00 (2006.01) C05G 3/00 (2006.01) C05G 3/10 (2006.01) C05G 5/00 (2006.01)

Patent

CA 2300259

A controlled release fertilizer formed from nutrient granules having intermediate or precoat layers of organic oil, such as raw linseed oil, prior to application of a polymeric, encapsulating coat. The precoat may also contain a binding agent, such as a fine clay, and a drier. The new fertilizer composition is made by a process of applying the oil precoat, but not curing it until after the encapsulating coat is applied. The use of the precoat provides more desirable controlled (delayed) release characteristics at a lower weight of the encapsulating coat, particularly for nutrient cores having a relatively large number of surface imperfections or discontinuities.

L'invention concerne un engrais à libération contrôlée formé à partir de granules nutritifs comportant des couches intermédiaires ou d'enrobage préliminaire d'huile organique, tel que de l'huile de lin brute, avant l'application d'un enrobage polymère d'encapsulation. L'enrobage préliminaire peut également contenir un agent de liaison, tel que de l'argile fine et un siccatif. La nouvelle composition d'engrais est fabriquée par un procédé consistant à appliquer l'enrobage d'huile, mais sans le durcir jusqu'à l'application de l'enrobage d'encapsulation. L'utilisation de l'enrobage préliminaire assure des caractéristiques de libération contrôlée à un poids inférieur d'enrobage d'encapsulation, en particulier, pour des noyaux nutritifs présentant un nombre relativement important d'imperfections de surface ou de discontinuités.

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