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...
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.