Time-release control-type coated granular pesticide

A - Human Necessities – 01 – N

Patent

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Details

A01N 25/26 (2006.01) A01N 25/12 (2006.01)

Patent

CA 2278204

Disclosed is a coated granular pesticide which comprises pesticidal granules for coating coated with a resin film, which pesticidal granules include at least one pesticidally active ingredient as its effective component and have a circularity coefficient of 0.7 or over when determined according to the following calculation equation, wherein said pesticide has a slow release function of a timed-release control-type consisting of a release- suppression time of suppressing the release of the pesticidally active ingredient over a given period after application thereof and a release time of continuing the release of the pesticidally active ingredient after lapse of the given period: circularity coefficient = (4.pi. x projected area of a granule)/(profile length in a granule projection drawing)2.

La première invention se rapporte à des granules agrochimiques non enrobés caractérisés en ce qu'ils contiennent au moins un composant agrochimique efficace qui a une fonction d'ingrédient actif et en ce que leur coefficient de circularité est égal ou supérieur à 0,7, selon la formule ci-dessous; l'invention se rapporte également à des granules agrochimiques enrobés fabriqués par l'enrobage desdits granules agrochimiques non enrobés avec une substance à base de résine: coefficient de circularité = (4 pi x surface de la projection d'un granule)/(longueur du contour de la projection d'un granule)<2>. La seconde invention se rapporte à des granules agrochimiques enrobés à temps de libération contrôlé, fabriqués par enrobage de granules agrochimiques possédant un pouvoir de gonflement compris entre 1 et 30 ml/2g lors de l'absorption de l'eau, la substance d'enrobage comprenant une résine thermoplastique qui agit comme un composant filmogène. Les granules agrochimiques présentent d'excellentes propriétés d'inhibition de la libération initiale et de stabilisation de la dissolution initiale.

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