Hypromellose acetate succinate and method for producing hypromellose acetate succinate

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United States of America Patent

PATENT NO 10934367
APP PUB NO 20180057612A1
SERIAL NO

15683222

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Abstract

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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 for producing hypromellose acetate succinate, comprising an esterification step of reacting hypromellose with an esterification agent 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 obtaining a hypromellose acetate succinate suspension, a liquid removal step of removing a liquid from the hypromellose acetate succinate suspension with a centrifugal decanter to obtain liquid-removed hypromellose acetate succinate, and a drying step of drying the liquid-removed hypromellose acetate succinate.

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Patent Owner(s)

  • SHIN-ETSU CHEMICAL CO. LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kikuchi, Kazuki Joetsu, JP 15 30
Matsubara, Junichi Joetsu, JP 28 46
Yoshida, Mitsuhiro Joetsu, JP 104 821

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