Basic disazo dyes having two 2-hydroxy-3-substituted carbamoylnaphthyl-1-azophenyl groups for dyeing paper
AssigneeSandoz Ltd.
InventorsHelmut Moser, Hans VON Tobel
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Abstract
Azo dyes of the formula ##STR1## wherein X represents a direct bond or a divalent radical, Y represents a direct bond, an alkylene radical, --S--, --O--, --NH--CO--NH-- or --CH=CH--, R represents a hydrogen atom or a hydrocarbon radical and K represents a primary, secondary or tertiary amino group or an ammonium, hydrazinium or a cycloimmonium group which are useful for dyeing fibers and textiles of polyacrylonitrile or acrylonitrile copolymers and for the dyeing of paper.
Claims18
In a process for the production of colored paper comprising (A) incorporating a dye composition into paper stock and forming paper from said paper stock or (B) applying a dye composition to paper sheet, the improvement wherein said dye composition is or comprises a dye of the formula
- wherein each
- R, r.sub.1 and R.sub.2 is independently hydrogen, hydrocarbyl or substituted hydrocarbyl or
- R.sub.1 and R.sub.2 taken together and with the nitrogen atom to which they are joined form a saturated or partially saturated heterocyclic group,
- each K.sup..sym. is independently an ammonium, substituted ammonium, hydrazinium, substituted hydrazinium, cycloimmonium or substituted cycloimmonium group,
- each X is independently a direct bond or a divalent radical,
- each X.sub.1 is independently a divalent radical,
- Y is a direct bond, alkylene, substituted alkylene, --S--, --O--, --NH--CO--NH-- or --CH=CH--, and
- each A.sup..crclbar. is independently an anion,
- wherein each of Rings Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, Z.sub.5 and Z.sub.6 is independently further unsubstituted or further substituted.
Dependencies are inferred from the claim text.