Cellulose interpolymers and method of oxidation

US7879994B2 · kind B2 · utility

Assignee

• Eastman Chemical Company · US

Inventors

• Charles Michael Buchanan · Kingsport, US
• Norma Lindsey Buchanan · Elizabethton, US
• Susan Northrop Carty · Kingsport, US
• Chung-Ming Kuo · Kingsport, US
• Juanelle Little Lambert · Jonesborough, US
• Jessica Dee Posey-Dowty · Kingsport, US
• Thelma Lee Watterson · Kingsport, US
• Matthew Davie Wood · Jonesborough, US
• Michael Orlando Malcolm · Kingsport, US
• Margaretha Soderqvist Lindblad · Vallentuna, SE

Key dates

• Filing date: Nov 23, 2004
• Grant date: Feb 1, 2011
• Expiry date: Dec 25, 2026

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K9/2866
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

This invention provides cellulose ester interpolymers, and methods of oxidizing cellulose interpolymers and cellulose ester interpolymers. The invention also provides routes to access carboxylated cellulose ester derivatives with high acid numbers wherein the carboxyl group is attached directly to the cellulose backbone by a carbon-carbon bond. Through functionalization of an intermediate aldehyde, the corresponding cationic or zwitterionic cellulose ester derivatives can also be accessed. The interpolymers of the present invention have a number of end-use applications, for example, as binder resins in various types of coating compositions and as drug delivery agents.