Storage and dilution of stable aqueous dispersions

Details Storage and dilution of stable aqueous dispersions Storage and dilution of stable aqueous dispersions

A - Human Necessities

01

N

A01N 25/04 (2006.01) A01N 25/28 (2006.01) B01F 17/00 (2006.01) B01F 17/52 (2006.01) B01J 13/02 (2006.01)

Patent

CA 2171848

A formulation e.g., a pesticidal formulation in the form of a dispersion comprising a continuous aqueous phase, and a discontinuous phase comprising a non-aqueous material capable of transport through the aqueous phase to cause Ostwald ripening of the dispersion, wherein there is contained within the discontinuous phase a pesticidal material, which may or may not be the said non-aqueous material, wherein the discontinuous phase comprises a stabiliser in an amont sufficient to depress migration of the non-aqueous material through the aqueous phase, and thereby diminish or prevent Ostwald ripening of the dispersion, characterised in that the stabiliser has a molecular weight of not mon than 10,000, and is soluble in the discontinuous phase, but insoluble in and not transportable through the aqueous phase. The production of the formulation can be carried out in a metered in-line mixing plant, since the thermodynamics of the mining process is such that the particle size tends to a predictable value.

Formulation, par exemple formulation pesticide sous la forme d'une dispersion comportant une phase aqueuse continue, et une phase discontinue comportant une matière non aqueuse qui peut être transportée à travers la phase aqueuse afin de provoquer une maturation d'Ostwald de la dispersion. La phase discontinue contient une matière pesticide qui peut être ladite matière non aqueuse ou non. La phase discontinue comporte un stabilisant en quantité suffisante pour réprimer la migration de la matière non aqueuse à travers la phase aqueuse et diminuer ou empêcher ainsi la maturation d'Ostwald de la dispersion. Le produit est caractérisé en ce que le stabilisant a un poids moléculaire de 10.000 au maximum et il est soluble dans la phase discontinue, mais insoluble et non transportable dans la phase aqueuse. La production de cette formulation peut être réalisée dans une installation de malaxage dosée en ligne, car la thermodynamique du processus de mélange est telle que la taille des particules a tendance à avoir une valeur prévisible.

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