Slow-release polyurethane encapsulated fertilizer using oleo...

C - Chemistry – Metallurgy – 05 – G

Patent

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C05G 3/00 (2006.01)

Patent

CA 2352442

This invention relates to polyurethane encapsulated fertilizer particles which exhibit slow-release properties and to a process for their production. The process comprises (1) applying an isocyanate-reactive component or a polyisocyanate component to fertilizer particles, to form coated fertilizer particles, followed by (2) applying a polyisocyanate component or an isocyanate-reactive component onto the coated fertilizer particles to form polyurethane encapsulated fertilizer particles, and, optionally, repeating these steps as many times as necessary to form the polyurethane encapsulated fertilizer particles that contain about 2 to 20% by weight of polyurethane, based on the total weight of the encapsulated fertilizer particles. Alternatively, the isocyanate-reactive component and the polyisocyanate component can be premixed prior to being applied to the fertilizer particles to form polyurethane encapsulated fertilizer particles. Suitable isocyanate-reactive components comprise oleo polyols.

L'invention concerne des particules d'engrais encapsulées dans du polyuréthane à libération lente ainsi qu'un procédé pour préparer ces particules. Ce procédé comporte les étapes suivantes : 1) application d'un composé réagissant aux isocyanates ou un polyisocyanate sur des particules d'engrais pour obtenir des particules d'engrais revêtues; 2) application d'un polyisocyanate ou d'un composé réagissant aux isocyanates sur les particules d'engrais revêtues afin d'obtenir des particules d'engrais encapsulées et, de manière facultative, répétition de ces étapes autant de fois que nécessaire pour produire des particules d'engrais encapsulées dont la teneur en polyuréthane est d'environ 2 à 20 % en poids par rapport au poids total des particules d'engrais encapsulées. Le composé réagissant aux isocyanates et le polyisocyanate peuvent également être prémélangés avant leur application sur les particules d'engrais dans le but de produire des particules dMengrais encapsulées dans le polyuréthane. Parmi les composés réagissant aux isocyanates qui conviennent figurent les oléopolyols.

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