Cationic polyazo dyestuffs, their stable solutions, their preparation, and their use
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United States of America Patent
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Mar 5, 1985
Grant Date -
N/A
app pub date -
Jan 16, 1984
filing date -
Feb 3, 1983
priority date (Note) -
Expired
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Abstract
Cationic polyazo dyestuffs which can be obtained by reacting diaminobenzene derivatives of the general formula ##STR1## wherein R represents hydrogen, C.sub.1 - to C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -alkoxy or halogen, if appropriate in a mixture with up to 30% of aromatic monoamines of the formula ##STR2## wherein R.sup.2 represents hydrogen, C.sub.1 - to C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -alkoxy, halogen or C.sub.1 - to C.sub.4 -acylamino and n represents 1 to 3, with 0.5 to 0.75 mole of a salt or ester of nitrous acid per mole of diamine and then with 1 to 4 moles of an alkylene oxide of the formula ##STR3## wherein R.sup.3 represents hydrogen or an optionally hydroxyl-, alkoxy- or halogen-substituted C.sub.1 - to C.sub.4 -alkyl radical, are used--preferably in the form of their solutions--for dyeing paper, leather and anionically modified synthetic fibres.
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