Patent ID: 6531156
Filing Date: 2003-03-11
Classification: A61K,B01J

Abstract:
A process for preparing a microcapsule comprising an aqueous core surrounded by a capsular wall, said capsular wall comprising a Lewis salt of an amine and an anionic polymer, said process comprising the steps of:a) selecting a water soluble a anionic polymer, or water soluble salt thereof, and a water soluble amine, or water soluble salt thereof, said anionic polymer and said amine being selected from pairs of anionic polymer and amine having the property that when droplets of an aqueous liquid solution of the anionic polymer are introduced into an aqueous liquid solution of said amine, stable microcapsules of the amine salt of the anionic polymer are formed; b) dissolving said anionic polymer, or salt thereof, in water to form an anionic polymer liquid solution; c) dissolving said amine, or salt thereof, in water to form an amine liquid solution; d) dissolving or suspending an active ingredient in said anionic polymer liquid solution of step b) so that a liquid composition is formed; e) forming a droplet of said liquid composition resulting from step d); f) adding said droplet of said liquid composition to said amine liquid solution; and g) allowing said droplet of said liquid composition and said amine liquid solution to react at their mutual interface boundary to form said microcapsule.