Disazo urea dyestuff solutions

Details Disazo urea dyestuff solutions Disazo urea dyestuff solutions

D - Textiles, Paper

06

P

8/25.2

D06P 1/02 (2006.01) C09B 43/14 (2006.01) C09B 67/26 (2006.01)

Patent

CA 1112003

Disazo Urea Dyestuff Solutions Abstract of the Disclosure A stable concentrated solution of an azo dyestuff is prepared by forming a tertiary alkanolammonium salt of an aminoazo compound of formula I, alone or in admixture with an aminoazo compound of formula II: formula I Image formula II Image where A and B each independently, in each occurrence is a naphthylene or phenylene group, and thereafter phosgenating in aqueous solution while maintaining the desired pH with a lithium base. The dyestuffs formed are substantive to cellulose, e.g., paper, and the highly concentrated solutions obtained are stable.

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