Hydroxypropyl Methyl Cellulose, the full form of HPMC, is a non-ionic cellulose alkyl hydroxyalkyl mixed ether obtained through the processes of alkalization, etherification, neutralization, and washing of cellulose. The methyl substitution degree of commercial HPMC ranges from 1.0 to 2.0 and an average hydroxypropyl substitution degree ranges from 0.1 to 1.0. Its chemical structure is as shown in the figure.
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