Method for preparing hydroxypropyl methylcellulose acetate succinate (HPMCAS) grains having controlled grain size distribution, and HPMCAS powder
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
Feb 18, 2020
Grant Date -
Oct 27, 2016
app pub date -
Dec 15, 2014
filing date -
Dec 15, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
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).
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully