Process for isolating easily soluble basic oxazine dyestuffs and

Details Process for isolating easily soluble basic oxazine dyestuffs and Process for isolating easily soluble basic oxazine dyestuffs and

1974-10-17

1976-08-03

Rosen, Sam

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260267, C07D26538, C07D27300, C07D29500, C07D24146

Patent

active

039728790

ABSTRACT:
Basic oxazine and phenazine dyestuffs are isolated from their solutions by adding urea or thiourea.

REFERENCES:
patent: 3655601 (1972-04-01), Ottawa et al.
patent: 3681347 (1972-08-01), Herz et al.
patent: 3731222 (1973-05-01), Drexhage
patent: 3806504 (1974-04-01), Mundlos et al.
"Effect of Urea on the Aqueous Solubility of Dispersed Dyes", Katayama et al., -Kolloid-Z 202(2), pp. 157-161-(1965).

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