US Patent Issued to Shin-Etsu Chemical on Dec. 23 for "Hydroxypropyl methyl cellulose acetate succinate, method for producing the same, and composition for hot-melt extrusion" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,503,521, issued on Dec. 23, was assigned to Shin-Etsu Chemical Co. Ltd. (Tokyo).

"Hydroxypropyl methyl cellulose acetate succinate, method for producing the same, and composition for hot-melt extrusion" was invented by Akiko Miki (Tokyo), Taishi Kitaguchi (Niigata, Japan), Akira Kitamura (Niigata, Japan) and Mitsuo Narita (Niigata, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a method for efficiently produce hydroxypropyl methyl cellulose acetate succinate (HPMCAS) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provi...