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US 4,374,642 AGranted
Dyestuff mixtures, a process for their preparation and a process for dyeing hydrophobic fibres
AssigneeBayer Aktiengesellschaft
InventorsHorst Brandt, Reinhold Hornle, Richard Buchele, Dieter Wiegner
Life of this patent
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Abstract
Mixed crystals of dyestuffs of the formula I ##STR1## wherein R denotes alkyl and n denotes a number from 2 to 4, and dyestuffs of the formula II ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 denote alkyl, with a characteristic X-ray diffraction diagram are distinguished by a high tinctorial strength and liquor stability when they are used for dyeing polyester fibres.
Claims6
Dyestuff mixed crystals consisting of 75-99 percent by weight of (a) at least one dyestuff of the formula ##STR9## wherein R is C.sub.1 -C.sub.4 -alkyl and
- n is 2, 3 or 4,
- and 1-25 percent by weight of (b) at least one dyestuff of the formula ##STR10## wherein R.sub.1 and R.sub.2 each is C.sub.1 -C.sub.5 -alkyl and
- R.sub.3 is C.sub.1 -C.sub.2 -alkyl,
- the X-ray diffraction diagram of the crystals having reflection intensities of 100, 26, 14 and 54 at the angles of incidence .theta. of 5.75.degree., 10.0.degree., 16.2.degree. and 26.4.degree..
1 more element
Dependencies are inferred from the claim text.