Esters of cellulose with phosphonic acid dyes having a sulfonamide bridge

Abstract

Dyes of the formula ##STR1## are disclosed which are useful in dyeings where the phosphonic acid group serves both as a water-solubilizing group and as a group capable of reacting to bond covalently with the fiber to be dyed. Application of the dyes to cellulose results in reactive dyeing by immobilization of the dye as a cellulose phosphonate ester. The dye substituent is a chromophore, e.g. an anthraquinone or azo chromophore, while R may be hydrogen or lower alkyl.

Dependencies are inferred from the claim text.