Method and device for producing very fine particles and...

A - Human Necessities – 61 – K

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A61K 9/14 (2006.01) B01F 5/06 (2006.01) B01J 2/00 (2006.01)

Patent

CA 2628562

Disclosed are methods and devices for producing very fine particles which are then coated with protective polymers in another step of the process. The particles are produced using a method in which a liquid flow comprising a particle-free liquid 1 that contains the active substance in a dissolved form is combined with a second liquid flow comprising a liquid 2 in a high-energy zone or no sooner than two seconds before reaching the high-energy zone. Said two liquids can be mixed with each other while the active substance dissolved in liquid 1 is insoluble or more difficult to dissolve in liquid 2 than in liquid 1 and settles in the form of particles in the high-energy zone or within a maximum of 2 seconds before reaching the high-energy zone when the two liquids are mixed. The obtained particles are introduced into an aqueous outer phase which contains the coating materials in a dissolved form and are then subjected to a drying step such that said materials settle on the particles as a closed coating. The coated particles are protected from damaging influences and are provided with modified release kinetics compared to uncoated particles.

L'invention concerne des procédés et des dispositifs de fabrication de particules ultra-fines, revêtues de polymères protecteurs dans une étape de processus ultérieure. Les particules sont fabriquées au moyen d'un procédé selon lequel un flux de liquide composé d'un liquide (1) exempt de particules, contenant l'agent actif, est mélangé à un deuxième flux de liquide composé d'un liquide (2) dans une zone très énergétique, ou au plus tôt 2 secondes avant atteinte de la zone très énergétique. Les deux liquides sont miscibles et l'agent actif dissous dans le liquide (1) n'est pas soluble, ou moins soluble, dans le liquide (2), et précipite sous forme de particules dans la zone très énergétique ou au maximum 2 secondes avant atteinte de la zone très énergétique. Les particules ainsi fabriquées sont introduites dans une phase extérieure aqueuse contenant les éléments de revêtement sous forme dissoute, puis soumises à une étape de séchage, de telle manière que ces éléments précipitent sur les particules en tant que revêtement fermé. Les particules ainsi revêtues sont protégées contre des influences néfastes et présentent, contrairement à des particules non revêtues, une cinétique de libération modifiée.

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