Title:
CRYSTAL OF 2-HYDROXYNAPHTHALENE-3-CARBOXYLIC ACID AND PROCESS FOR THE PREPARATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2000/068177
Kind Code:
A1
Abstract:
A crystal of 2-hydroxynaphthalene-3-carboxylic acid (BON), characterized in that the mean particle diameter is 157 $g(m)m or above and the content of particles having diameters of 74 $g(m)m or below is 14 % or below. This crystal can be prepared by a process comprising either the step of recrystallizing BON, particularly at high temperature, or the step of conducting at high temperature the acid deposition of BON constituting the production process thereof.
Inventors:
UENO RYUZO (JP)
KITAYAMA MASAYA (JP)
IZUMICHI NOBUTAKA (JP)
KATO HIROYUKI (JP)
KITAYAMA MASAYA (JP)
IZUMICHI NOBUTAKA (JP)
KATO HIROYUKI (JP)
Application Number:
PCT/JP2000/002862
Publication Date:
November 16, 2000
Filing Date:
May 01, 2000
Export Citation:
Assignee:
UENO SEIYAKU OYO KENKYUJO KK (JP)
UENO RYUZO (JP)
KITAYAMA MASAYA (JP)
IZUMICHI NOBUTAKA (JP)
KATO HIROYUKI (JP)
UENO RYUZO (JP)
KITAYAMA MASAYA (JP)
IZUMICHI NOBUTAKA (JP)
KATO HIROYUKI (JP)
International Classes:
C07C51/41; C07C51/43; C07C65/11; (IPC1-7): C07C65/11; C07C51/43
Foreign References:
| GB2008090A | 1979-05-31 | |||
| JPS5535042A | 1980-03-11 |
Other References:
See also references of EP 1095929A4
Attorney, Agent or Firm:
Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku, Osaka-shi Osaka, JP)
Download PDF:
Previous Patent: METHOD FOR PREPARING FORMALDEHYDE
Next Patent: A PROCESS FOR THE PURIFICATION OF DIACEREIN
Next Patent: A PROCESS FOR THE PURIFICATION OF DIACEREIN