The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 2020
Filed:
Dec. 15, 2014
Lotte Fine Chemical Co., Ltd., Ulsan, KR;
Sung Hwan Bang, Incheon, KR;
Ju Hee Shin, Incheon, KR;
Jin Ryul Son, Incheon, KR;
Kyung Yeol Park, Incheon, KR;
Jeong Hee Chun, Incheon, KR;
Ji Seon Jeong, Incheon, KR;
Sang Youb Lee, Incheon, KR;
LOTTE FINE CHEMICAL CO., LTD., Ulsan, KR;
Abstract
Disclosed are a method for preparing hydroxypropyl methylcellulose acetate succinate (HPMCAS) grains and HPMCAS grains. The disclosed method for preparing HPMCAS grains comprises: a step of esterifying hydroxypropyl methylcellulose (HPMC), acetic anhydride, and succinic anhydride in a reaction medium in the presence of a catalyst so as to obtain a reaction solution containing HPMCAS (esterification step); and a step of continuously or intermittently putting the reaction solution into water so as to form grains (granulating step).