A process for the production of polyurea encapsulated...

C - Chemistry – Metallurgy – 05 – G

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C05G 3/00 (2006.01)

Patent

CA 2275887

This invention relates to a process for the production of polyurea encapsulated fertilizer particles. These are produced by applying an isocyanate-reactive component which contains at least two amine groups to fertilizer particles to form amine coated particles, and applying a polyisocyanate component to the amine coated particles to form polyurea coated particles. Theses steps may optionally be repeated in successive order. The resultant polyurea encapsulated fertilizer particles contain from about 0.5 to 15 % by weight of polyurea, based on the total weight of the encapsulated fertilizer particles. Instead of using an amine group containing isocyanate-reactive component, water can be applied first.

La présente invention concerne un procédé de production de particules d'engrais encapsulées dans de la polyurée, procédé selon lequel on applique un composant réagissant avec l'isocyanate renfermant au moins deux groupes amines sur les particules d'engrais afin de former des particules recouvertes d'amine, et on applique un composant polyisocyanate sur les particules recouvertes d'amine afin de former des particules recouvertes de polyurée. On peut facultativement répéter ces étapes dans cet ordre. Les particules d'engrais encapsulées dans la polyurée résultant de ce processus contiennent entre environ 0,5 % et 15 % en poids de polyurée par rapport au poids total des particules d'engrais encapsulées. On peut, au lieu d'utiliser un groupe amine contenant un composant réagissant avec l'isocyanate, appliquer de l'eau en premier lieu.

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