Concentrated aqueous solutions of cationic colorant and procedur

Details Concentrated aqueous solutions of cationic colorant and procedur Concentrated aqueous solutions of cationic colorant and procedur

1979-11-15

1981-04-28

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 2922

Patent

active

042644968

ABSTRACT:
The present invention provides concentrated aqueous acid solutions of the colorant having the formula: ##STR1## in which A.sup..crclbar. represents the formate, acetate or propionate anion. The solutions are prepared starting with the corresponding chloride or sulfomethylate by forming the m- or p-nitrobenzoate, dissolving said salt in formic, acetic or propionic acid and eliminating the nitrobenzoic acid which is precipitated. The solutions of the invention can be used for coloring and printing fibers containing acid groups, and particularly acrylic fibers.

REFERENCES:
patent: 3438963 (1969-04-01), Robbins
patent: 3770716 (1973-11-01), Ozutsumi et al.
patent: 4048151 (1977-09-01), Henzi
patent: 4051117 (1977-09-01), Kuhlthau et al.
patent: 4063889 (1977-12-01), Kissa

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