Title:
パラヒドロキシ安息香酸無水和物の結晶およびその製造方法
Document Type and Number:
Japanese Patent JP4549972
Kind Code:
B2
Abstract:
The present invention provides a process for preparing crystalline parahydroxybenzoic acid anhydride, comprising the step of precipitating and isolating parahydroxybenzoic acid in an aqueous solvent at a temperature equal to or above the transition temperature of parahydroxybenzoic acid.
Inventors:
Ryuzo Ueno
Masaya Kitayama
Nobutaka Izumi
Shoji Tachibana
Masaya Kitayama
Nobutaka Izumi
Shoji Tachibana
Application Number:
JP2005505393A
Publication Date:
September 22, 2010
Filing Date:
April 12, 2004
Export Citation:
Assignee:
Ueno Pharmaceutical Co., Ltd.
International Classes:
C07C51/43; C07C65/03
Domestic Patent References:
| JP2002316969A | 2002-10-31 |
Attorney, Agent or Firm:
Mitsuo Tanaka
Hiroshi Yamazaki
Michiko Matsutani
Mina Shiga
Sakurai Yoko
Hiroshi Yamazaki
Michiko Matsutani
Mina Shiga
Sakurai Yoko