Patent ID: 6616869
Filing Date: 2003-09-09
Classification: A61K,B01J

Abstract:
A method for microencapsulating an agent to form a microencapsulated product, comprising:dissolving a polymer in an effective amount of a solvent, dissolving or dispersing an agent in said effective amount of said solvent, wherein said polymer, said agent and said solvent form a mixture having a continous phase and wherein the solvent is said continuous phase, and introducing said mixture into an effective amount of a nonsolvent to cause the spontaneous formation of a microencapsulated product, wherein said step of introducing does not include emulsification, agitation, and/or stirring, wherein said solvent and said nonsolvent are miscible and the difference in solubility parameter of solvent/nonsolvent pairs or the solubility parameter of the nonsolvent/solvent pairs is less than 6, wherein the nonsolvent and solvent are used in effective amounts, wherein the effective amount per volume of nonsolvent is at least tenfold greater than the amount per volume of solvent.