HYPROMELLOSE ACETATE SUCCINATE, METHOD FOR PRODUCING THE SAME AND COMPOSITION CONTAINING THE SAME

USPTO Patent Application US 2018/0118854 A1
Application Date: May 3rd, 2018

ABSTRACT

Provided are hypromellose acetate succinate (HPMCAS) which exhibits high solubility and can suppress generation of undissolved materials when dissolved in a solvent; an HPMCAS-containing composition; and a method for producing...
Application Number:
15/853,164
International Classification:
C08B 13/00 (20060101); C09D 101/32 (20060101)
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CLAIMS

That which is claimed is:

1. A method for producing hypromellose acetate succinate comprising the steps of: reacting pulp with an alkali to obtain alkali cellulose;reacting the alkali cellulose with a methyl etherifying agent and a hydroxypropyl etherifying agent to obtain hydroxypropyl methyl cellulose in such a manner that a reaction ratio of the hydroxypropyl etherifying...

DESCRIPTION

RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No. 15/449,725, filed Mar. 3, 2017, which claims priority from Japanese Patent Application No. 2016-048254, filed Mar. 11, 2016, the disclosure of each of which is incorporated by reference herein in its entirety.
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