Emulsion manufacturing process

B - Operations – Transporting – 01 – F

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Details

B01F 3/08 (2006.01) B01F 9/10 (2006.01) C08J 3/03 (2006.01)

Patent

CA 2222308

The invention concerns a process for manufacturing a secondary emulsion consisting of droplets of a phase A that are dispersed in phase B, A being immiscible in B, from a polydispersed primary emulsion of identical formulation, made up of droplets from the said phase A dispersed in the said phase B, the droplets of the secondary emulsion having a diameter in all cases inferior to the diameter of the droplets of the primary emulsion. The characterizing feature is that the primary starting emulsion is viscoelastic, and that the said primary starting emulsion is subjected to a controlled shearing action in such a way that maximal shearing is applied to the emulsion as a whole.

L'invention concerne un procédé de préparation d'une émulsion secondaire constituée de gouttelettes d'une phase A, dispersées dans une phase B, A n'étant pas miscible dans B, au départ d'une émulsion primaire polydisperse de formulation identique et constitué de gouttelettes de ladite phase A dispersées dans ladite phase B, les gouttelettes de l'émulsion secondaire présentant un diamètre dans tous les cas inférieur au diamètre des gouttelettes de l'émulsion primaire, caractérisé en ce que l'émulsion primaire de départ est viscoélastique et en ce qu'on soumet ladite émulsion primaire de départ à un cisaillement contrôlé de telle sorte qu'un même cisaillement maximal soit appliqué à l'ensemble de l'émulsion. Ce procédé permet d'obtenir des émulsions monodispersés et à faible teneur en tensioactif, utilisables dans de nombreux domaines incluant, entre autre les domaines pharmaceutiques ou cosmétiques, le domaine des détergents et le domaine phytosanitaire.

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