Pest controlling

A - Human Necessities – 01 – N

Patent

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Details

A01N 63/00 (2006.01) A01N 25/28 (2006.01)

Patent

CA 2368239

The present invention features a sustained-release microcapsule for long-term pest controlling. In general, a microcapsule has a capsule core including active pest-control ingredients and diluents, and a capsule shell which physically separates the capsule core from the surrounding medium. Diluents are arranged to entrap active ingredients therein and to provide resistance to mass transfer of the active ingredients therethrough. The capsule shell generally includes the shell pores and provides additional resistance to mass transfer of the active ingredient therethrough. Diluents are selected from a class of material such that the mass transfer resistances existing in the capsule core and/or capsule shell depend on the temperature of the surrounding medium.

L'invention concerne une microcapsule à libération prolongée assurant une protection longue durée contre les ravageurs. Une microcapsule comprend en général un noyau contenant des ingrédients actifs pesticides et des supports, et une enveloppe qui sépare physiquement le noyau de la capsule du milieu environnant. Les supports sont préparés de manière à retenir les ingrédients actifs et à exercer une résistance au transfert de masse des ingrédients actifs. L'enveloppe de la capsule comprend en général des pores et offre une résistance complémentaire au transfert de masse des ingrédients. Les supports sont sélectionnés dans des classes de matières permettant une variation des résistances au transfert de masse à travers le noyau et/ou l'enveloppe de la capsule en fonction de la température du milieu environnant.

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