Title:
4,4’-ジメチル-6、6’-ジクロロチオインジゴの製造方法
Document Type and Number:
Japanese Patent JP4450446
Kind Code:
B2
Abstract:
4,4'-dimethyl-6,6'-dichloro-thioindigo crystals (Ia) with characteristic X-ray diffraction peaks, is obtained by oxidising 3-hydroxy-4-methyl-6-chloro-thionaphthene of specific mean particle size. Production of 4,4'-dimethyl-6,6'-dichloro-thioindigo of formula (I) in a stable crystalline modification I (Ia), which shows an X-ray diffraction pattern (Cu K alpha ) at an angle (2θ ), having strong peaks of 25.99 and 27.26 degrees and medium peaks at 10.27, 12.48, 22.39, 23.91, 24.82 and 28.87 degrees , involves treating 3-hydroxy-4-methyl-6-chloro-thionaphthene of formula (II) with an oxidizing agent, where (II) has a mean particle size of ≤ 20 mu m.
Inventors:
Wolffgang Bower
Uwe Boimler
Hans Kurz
Hans-Peter Kreutzell
Uwe Boimler
Hans Kurz
Hans-Peter Kreutzell
Application Number:
JP1232999A
Publication Date:
April 14, 2010
Filing Date:
January 20, 1999
Export Citation:
Assignee:
Clariant Produkte (Deutschland) Gesellschaft Mito Beschlenktel Haftung
International Classes:
C07D333/64; C09B67/20; C09B7/10; C09B67/48
Foreign References:
| US2158032 |
Attorney, Agent or Firm:
Mitsufumi Esaki
Tsuneo Mihara
Okumura Yoshimichi
Blacksmith
Tsuneo Mihara
Okumura Yoshimichi
Blacksmith