Water-soluble fast polymeric black colorant, its preparation and use in dyes and inks
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United States of America Patent
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Mar 1, 1983
Grant Date -
N/A
app pub date -
Jun 9, 1981
filing date -
Jun 9, 1981
priority date (Note) -
Expired
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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.
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