Patent ID: 6808557
Filing Date: 2004-10-26
Classification: A01N,C08B,C08J,C08K,C08L,C09D,C12N,Y10T

Abstract:
A method for forming a regenerated cellulose-encapsulated active substance that comprises the steps of:(a) providing a composition of cellulose dissolved in a molten hydrophilic ionic liquid solvent along with an active substance dissolved or dispersed substantially homogeneously therein, said solution being substantially free of water, organic solvent or nitrogen-containing base, wherein said ionic liquid is comprised of cations and anions; (b) admixing said solution with a liquid non-solvent for said cellulose that is miscible with said ionic liquid, said active substance being substantially insoluble in said non-solvent, said admixing forming a regenerated cellulose solid phase and an ionic liquid phase, whereby said active substance is encapsulated and substantially homogeneously dispersed in the formed regenerated cellulose solid phase, and wherein said regenerated cellulose has substantially the same molecular weight as the cellulose of step (a) and is substantially free of ionic liquid degradation products.