US Patent Issued to Northeast Forestry University on June 3 for "Carboxylated cellulose nanofiber and preparation method thereof" (Chinese Inventors)

ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,069, issued on June 3, was assigned to Northeast Forestry University (Harbin, China).

"Carboxylated cellulose nanofiber and preparation method thereof" was invented by Haipeng Yu (Harbin, China), Xiaochao Shi (Harbin, China) and Qinqin Xia (Harbin, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed herein is a carboxylated cellulose nanofiber and a preparation method thereof. The method includes: mixing choline chloride, citric acid and water at 60-100deg C. for 15-60 min to obtain a hydrated multi-carboxylic acid deep eutectic solvent (H-DES); mixing the H-DES and cellulose for hydrolysis-esterification reaction at 120-130deg C. for 2-3 ...