Method of producing microcapsules

A - Human Necessities – 61 – K

Patent

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A61K 9/50 (2006.01)

Patent

CA 2669745

A method of producing microcapsules of the type having a core and a coating encapsulating the core comprises the steps of providing a core-forming fluid stream and a coating-forming fluid stream, providing a two spray nozzle arrangement having a core nozzle disposed concentrically about a second nozzle, spraying the core-forming fluid stream from the core nozzle and the coat-forming fluid stream from the concentric nozzle to produce microcapsules, and solidifying the microcapsules upon formation in a suitable gas. Spray drying or spray chilling may be employed as the means of solidifying the microcapsules. Microcapsules having a core and a solid coat are also described.

La présente invention concerne un procédé de fabrication de microcapsules du type microcapsules dotées d'un noyau et d'un revêtement qui englobe le noyau. Le procédé consiste à envoyer un courant de fluide en vue de former le noyau et un courant de fluide pour la formation du revêtement au moyen d'un agencement de deux buses de pulvérisation dont la buse centrale, disposée concentriquement autour de la seconde, pulvérise le courant de fluide de manière à former le noyau tandis que la buse concentrique pulvérise le courant de fluide de manière à former le revêtement pour produire des microcapsules et les solidifier dans un gaz adapté. Le séchage par pulvérisation ou la réfrigération par pulvérisation peut être utilisé comme moyen de solidification des microcapsules. Cette invention concerne également la description des microcapsules qui ont un noyau et un revêtement solide.

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