Title:
【発明の名称】陰イオンアゾ染料の濃厚水性溶液の製法
Document Type and Number:
Japanese Patent JPH06500353
Kind Code:
A
Abstract:
PCT No. PCT/EP91/01830 Sec. 371 Date Mar. 26, 1993 Sec. 102(e) Date Mar. 26, 1993 PCT Filed Sep. 25, 1991 PCT Pub. No. WO92/06140 PCT Pub. Date Apr. 16, 1992.If highly concentrated aqueous solutions of azo dyes are prepared directly by diazotization and coupling reactions, appreciable difficulties generally result as a consequence of the fact that the diazotization and coupling reactions give rise to viscous phases which lead to stirring problems in the reaction apparatus used, which in turn results in an incomplete synthesis. The novel process for preparing concentrated aqueous dye solutions of an anionic dye in an aqueous medium overcomes this disadvantage by carrying out the diazotization of the aromatic amine diazo component and/or the coupling reaction between the diazonium salt and the coupling component in the presence of an auxiliary which exerts a viscosity-reducing effect on pasty phases. Examples of such auxiliaries are optionally alkyl-substituted naphthalenesulfonic acid-formaldehyde condensation products, ligninsulfonates, polyacrylates and copolymers of maleic anhydride and methacrylic acid or acrylic acid.
Inventors:
Mishke Peter
Homann Kurt
Schwap Eckhart
Zittig Manfred
Homann Kurt
Schwap Eckhart
Zittig Manfred
Application Number:
JP51492791A
Publication Date:
January 13, 1994
Filing Date:
September 25, 1991
Export Citation:
Assignee:
HOECHST AKTIENGESELLSCHAFT
International Classes:
C09B41/00; C09B67/00; C09B67/26; (IPC1-7): C09B41/00; C09B67/26
Attorney, Agent or Firm:
Mitsuyoshi Esaki (3 outside)