W/o/w composite emulsion

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/113 (2006.01) A61K 47/30 (2006.01) A61K 47/36 (2006.01) A61K 47/38 (2006.01) A61K 47/42 (2006.01) A61K 47/44 (2006.01)

Patent

CA 2430286

A W/O/W composite emulsion which comprises an aqueous phase containing a hydrophilic emulsifying agent and dispersed therein a W/Oemulsion comprising water, an oily ingredient, and an oleophilic emulsifying agent in a weight ratio within that range in FIG. 1 which is surrounded by the thick lines. It has sufficient stability, and a large amount of a drug can be kept being encapsulated in the inner aqueous phase thereof. It has hence become possible to incorporate a drug having an unpleasant flavour, an unstable drug, etc. into a low-viscosity liquid; this incorporation has conventionally been difficult. The emulsion therefore is utilizableas liquid preparations including internal ones, injections, etc.

L'invention concerne une émulsion composite E/H/E, qui comprend une phase aqueuse renfermant un polymère soluble dans l'eau et une émulsion E/H dispersée à l'intérieur. Cette émulsion contient de l'eau, un constituant huileux et un agent émulsifiant oléophile dans un rapport moléculaire situé dans la plage indiquée sur la fig. 1 et encadrée par les lignes épaisses. Cette émulsion présentant une stabilité suffisante, une grande quantité d'un médicament peut être maintenue encapsulée dans la phase aqueuse interne de ladite émulsion. Il est ainsi possible d'incorporer un médicament ayant un goût déplaisant, un médicament instable, etc. dans un liquide à faible viscosité, cette incorporation étant traditionnellement difficile. Cette émulsion peut donc être utilisée sous forme de préparations liquides, y compris à usage interne, sous forme d'injections, etc.

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