Method of preparing a solution of sulfonated aryl azo/diaryl...

Details Method of preparing a solution of sulfonated aryl azo/diaryl... Method of preparing a solution of sulfonated aryl azo/diaryl...

C - Chemistry, Metallurgy

09

B

8/50

C09B 67/10 (2006.01) C09B 69/04 (2006.01)

Patent

CA 2034060

A liquid dyestuff, useful as a major component of a ballpoint ink is prepared. A dye base, having both a sulfonic acid group and an azo group bonded to the same aromatic ring system, is provided in the aqueous phase of a two-phase system in which the organic phase is about 30 percent or more benzyl alcohol. In this two- phase system, the dye base is complexed with a diaryl guanidine, and the resulting dye concentrates in the organic solvent phase.

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