Method for producing hypromellose phthalate
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
May 3, 2022
Grant Date -
Jan 30, 2020
app pub date -
Jul 24, 2019
filing date -
Jul 24, 2019
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
There is provided a method for producing hypromellose phthalate (HPMCP), the method not requiring any special device, and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCP, including an esterification step of esterifying hypromellose with a carboxybenzoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCP; a precipitation step of precipitating the HPMCP by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCP; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCP contained in the neutralized suspension to obtain the washed HPMCP.
First Claim
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International Classification(s)
- 2019 Application Filing Year
- C08B Class
- 323 Applications Filed
- 169 Patents Issued To-Date
- 52.33 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C08B Class
- 0 % this patent is cited more than
- 3 Age
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