Controlled release fertilizer compositions and processes for...

C - Chemistry – Metallurgy – 05 – G

Patent

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C05G 3/00 (2006.01) A01N 25/00 (2006.01) C05G 5/00 (2006.01)

Patent

CA 2295915

A controlled release fertiliser composition is provided having a fertiliser compound in a granular core with a coating applied on the core material. The fertiliser composition is structured to enable a cumulative release of fertiliser compound of less than 10 % of the total weight of the fertiliser compound in the granular core within 30 days after exposure of the fertiliser composition to moisture and the coating consists of a single layer of a uniform, substantially continuous polymer film which is present on at least 90 % of the granular core material. A process is also provided for producing the fertiliser composition.

Cette invention concerne une composition d'engrais à libération contrôlée qui comprend un composé d'engrais se trouvant dans un noyau granulaire, un revêtement étant appliqué sur le matériau dont est fait le noyau. La composition d'engrais est structurée de manière que la libération cumulée du composé d'engrais soit inférieure à 10 % du poids total de celui ci dans le noyau granulaire dans les 30 jours qui suivent l'exposition de ladite composition d'engrais à l'humidité. Le revêtement se présente sous forme d'une couche unique d'un film polymère uniforme et globalement continu, lequel film recouvre au moins 90 % du matériau dont est fait le noyau granulaire. Cette invention concerne également un procédé permettant de produire cette composition d'engrais.

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