HYDROXYPROPYL METHYL CELLULOSE PHTHALATE, METHOD FOR PRODUCING THE SAME, AND COMPOSITION FOR HOT-MELT EXTRUSION
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United States of America
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Apr 7, 2022
app pub date -
Sep 24, 2021
filing date -
Sep 24, 2021
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Abstract
There is provided a method for efficiently produce hydroxypropyl methyl cellulose phthalate (HPMCP) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provided a method for producing HPMCP including an esterification step of esterifying hydroxypropyl methyl cellulose (HPMC) with phthalic anhydride in acetic acid as a solvent to obtain a reaction product solution containing HPMCP; a water addition step of adding water to the reaction product solution to obtain a water-added reaction product solution; an acetic acid removal step of removing at least a portion of the acetic acid from the water-added reaction product solution to obtain a mixture having an acetic acid content reduced; and a wash and recovery step of washing the mixture and recovering the HPMCP.
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