The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1987
Filed:
Apr. 11, 1985
David L Gardner, Bellville, OH (US);
Batelle Development Corporation, Columbus, OH (US);
Abstract
A process for preparing polylactide (PLA) microcapsules is described and involves dissolving PLA in a mixture of two miscible organic liquids, the higher vapor pressure liquid having solvent power for PLA and the second having little or no solvent power for PLA. The solution is prepared such that it is near its saturation point for PLA. Encapsulation of dispersed core material is achieved by vaporizing the liquid having solvent power for PLA causing phase separation of the PLA, then transferring the separated dispersion to an organic liquid having no solvent power for the PLA in order to harden the encapsulating coating. The disclosed process enables forming true microcapsules or reservoir-type devices encapsulating liquid core material particularly aqueous liquid core material and oil in water emulsion or suspensions.