HYPROMELLOSE ACETATE SUCCINATE AND METHOD FOR PRODUCING HYPROMELLOSE ACETATE SUCCINATE

USPTO Patent Application US 2018/0057612 A1
Application Date: Mar. 1st, 2018

ABSTRACT

Provided is a method for producing HPMCAS capable of reducing the average particle size of HPMCAS particles to an intended range without a pulverization step. Specifically provided is a method...
Assignee(s):
Application Number:
15/683,222
International Classification:
C08B 3/06 (20060101); A61K 47/38 (20060101); B04B 1/20 (20060101)
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CLAIMS

What is claimed is:

1. A method for producing hypromellose acetate succinate, comprising: an esterification step of reacting hypromellose with esterification agents in the presence of a catalyst to obtain a reaction solution containing crude hypromellose acetate succinate;a precipitation step of mixing the reaction solution with water to precipitate the crude hypromellose acetate succinate, thereby...

DESCRIPTION

BACKGROUND OF THE INVENTION

The invention relates to hypromellose acetate succinate and a method for producing hypromellose acetate succinate.
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