Cellulose ester compositions

US11697726B2 · kind B2 · utility

Assignee

• Eastman Chemical Company · US

Inventors

• Haining An · Kingsport, US
• David Wayne Compton · Church Hill, US
• Michael Eugene Donelson · Kingsport, US
• Wesley Wayne McConnell · Grayslake, US
• Jeffrey Todd Owens · Kingsport, US

Key dates

• Filing date: Nov 9, 2017
• Grant date: Jul 11, 2023
• Expiry date: Oct 31, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/025
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The application discloses cellulose ester compositions comprising two or more miscible blends of cellulose ester each comprising a plurality of propionyl substituents having tunable rheology and physical properties not achievable by any one of the cellulose esters alone. These cellulose ester compositions can be further processed, with or without other materials such as plasticizers, flame retardants, and blowing agents, and converted into articles. These cellulose ester compositions have higher modulus and have low to no butyryl/butyric acid content relative to cellulose acetate butyrate (“CAB”) cellulose ester compositions made from CABs having a butyryl content of greater than 30 wt %.