Dyestuff mixture
AssigneeBayer Aktiengesellschaft
InventorsHorst Nickel, Hans-Gunter Otten
Life of this patent
Estimating the term…
Abstract
Mixtures of dyestuffs of the formula I ##STR1## and of the formula II ##STR2## wherein R=alkyl, R.sub.1 =H or R and R.sub.2 /R.sub.3 =R.sub.1 or alkoxy, are distinguished by being readily soluble in hard water and produce satisfactory golden yellow dyeings on polyamide fibres.
Claims5
Mixture of disazo dyestuffs which, in the form of the free acid, have the formula ##STR16## and disazo dyestuffs which, in the form of the free acid, have the formula ##STR17## wherein, independently of each other, R denotes optionally substituted alkyl,
- R.sub.1 denotes H or alkyl and
- R.sub.2 and R.sub.3 each denote H, alkyl or alkoxy the mixture comprising 20-60% by weight of dyestuff I and 80-40% by weight of dyestuff II.
Mixtures of disazo dyestuffs of the formula ##STR18## wherein R.sub.1 ' denotes H or CH.sub.3,
- R.sub.2 ' denotes H or CH.sub.3 and
- R.sub.3 ' denotes CH.sub.3 or OCH.sub.3
- and disazo dyestuffs of the formula ##STR19## wherein R.sub.1 '-R.sub.3 ' are as defined above,
- R denotes methyl, ethyl, .beta.-hydroxyethyl, .beta.-hydroxypropyl or .beta.-hydroxy-n-butyl and
- the sulpho group is in the m- or p-position relative to the azo bridge.
Mixtures of disazo dyestuffs of the formulae ##STR20##
Dependencies are inferred from the claim text.