Abstract A dyeing-stable modification (β-modification) of the dyestuff of the formula (I) ##STR1## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles and relative intensities: ______________________________________ [θ]
2.74 4.27 4.70 5.50 8.74 11.24 12.44
relative
100 72 40 23 27 32 26
intensity
______________________________________ a process for its preparation by heating the dyestuff of said formula (I) of the dyeing-unstable α-modification, characterized by an X-ray diffraction diagram having the characteristic reflections at the following glancing angles and relative intensities______________________________________[θ] 3.55 4.15 5.35 9.45 10.41 12.71 13.89relative 42 100 35 24 34 94 48intensity______________________________________ at temperatures of 60° to 120° C. in an organic solvent, and its use for dyeing fiber materials made of cellulose esters or synthetic linear polyesters.
The dyeing-stable modification (β-modification) of the dyestuff of the formula ##STR3## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles and relative intensities: ______________________________________
[θ]
2.74 4.27 4.70 5.50 8.74 11.24 12.44
relative
100 72 40 23 27 32 26
intensity
______________________________________
Claim 2
Dependent Claim
53 words
The dyeing-stable modification (β-modification) of the dyestuff of the formula ##STR3## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles and relative intensities: ______________________________________
[θ]
2.74 4.27 4.70 5.50 8.74 11.24 12.44
relative
100 72 40 23 27 32 26
intensity
______________________________________
Claim 3
Dependent Claim
92 words
A process for preparing the dyeing-stable modification (β-modification) of the dyestuff of the formula ##STR4## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles θ and intensities ______________________________________
[θ]
2.74 4.27 4.70 5.50 8.74 11.24 12.44
relative
100 72 40 23 27 32 26
intensity
______________________________________ which comprises heating the dyestuff of said formula (I) of the dyeing-unstable α-modification, which is characterized by the X-ray diffraction diagram of FIG. 2, at temperatures of 60° to 120° C. in an organic solvent.
Claim 4
Dependent Claim
92 words
A process for preparing the dyeing-stable modification (β-modification) of the dyestuff of the formula ##STR4## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles θ and intensities ______________________________________
[θ]
2.74 4.27 4.70 5.50 8.74 11.24 12.44
relative
100 72 40 23 27 32 26
intensity
______________________________________ which comprises heating the dyestuff of said formula (I) of the dyeing-unstable α-modification, which is characterized by the X-ray diffraction diagram of FIG. 2, at temperatures of 60° to 120° C. in an organic solvent.
Claim 5
Dependent Claim
30 words
The process as claimed in claim 2, wherein the heating is carried out in a low molecular weight alkanol, acetic acid, toluene or glycol monomethyl ether as the organic solvent.
Claim 6
Dependent Claim
21 words
Process for dyeing fiber materials made of cellulose esters or synthetic linear polyesters with the dyeing-stable modification (β-modification) of claim 1.