Modified acid dyestuff

Details Modified acid dyestuff Modified acid dyestuff

C - Chemistry, Metallurgy

09

B

260/178, 260/164

C09B 31/047 (2006.01) C09B 67/00 (2006.01) D06P 1/02 (2006.01)

Patent

CA 1279869

MODIFIED ACID DYESTUFF Abstract of the Disclosure Crystalline modification, designated ".beta.", of the dye of the structure Image wherein M is an alkali metal ion, alkaline earth metal ion or the ammonium ion. The .beta.-crystalline modification of the dye is easier to isolate from water and gives filter cakes of higher solids and color content. The .beta.-form is also more suitable for making liquid formulations of the dye; the liquid formulations of the crystalline modification have lower viscoity and better dispersion stability than liquid formulations of non-modified form. The .beta.-modification of the dye is obtained by heating an aqueous slurry of the dye at about 80° to 120°C optionally under pressure and pH of 8.5 to 9.5 until the modification is complete. The crystalline modification of the dye gives Debye-Scherrer X-ray diffraction patterns substantially different from the non-modified form.

520272

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