Water-soluble fast polymeric black colorant, its preparation and use in dyes and inks
AssigneeDynapol
InventorsRobert E. Wingard, Jr., Steve Y. W. Ng, Sally A. Swanson
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Abstract
A family of polymeric black colorants is disclosed. The subject colorants are composed of an organic polymer backbone comprised of a plurality of aromatic rings from which depend via azo groups a plurality of chromophore units having the structure ##STR1## wherein M is hydrogen or preferably a cation. These polymeric colorants are water-soluble, and noncrystalline and form dyes and inks that are fast to paper stock.
Claims17
A water-soluble polymeric black colorant which comprises an organic polymer backbone comprising a plurality of aromatic rings and a plurality of units of 8-(4-anilino-5-sulfo-1-naphthlylazo)-1-naphthol-3,6-disulfonic acid or a cation salt thereof covalently bonded to said backbone via azo groups that link a backbone aromatic carbon and the 2-position carbon of said acid or cation salt units.
Dependencies are inferred from the claim text.