US Patent 7,595,392
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 Dong, Yang Biodegradable oxidized cellulose esters. US Patent 7,595,392 filed December 06, 2001 and issued September 29, 2009. https://ir.uiowa.edu/patents/489