US Patent 7,662,801
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
The present invention relates to the preparation of a series of oxidized cellulose esters suitable for use as a drug carrier in the development of biodegradable controlled and/or sustained release pharmaceutical, agricultural, and veterinary compositions, such as films, compacts, microspheres, and pellets. The esters are prepared by acylation of oxidized cellulose having at least 3% carboxyl groups. The resulting oxidized cellulose esters are soluble in aqueous alkaline solutions, water, and a variety of organic solvents.
Kumar, Vijay and Dang, Yang Biodegradable oxidized cellulose esters. US Patent 7,662,801 filed December 13, 2005 and issued February 16, 2010. https://ir.uiowa.edu/patents/495