Abstract The modification being stable under dyeing conditions of the dyestuff of the formula ##STR1## characterized by an X-ray diffraction diagram with characteristic reflexes at the following glance angles θwith the relative intensities as given below: ______________________________________ [o] 2.45
6.30 10.07 11.00
11.35
11.70
12.36
13.55
14.80
15.85
63 100 30 48 83 88 86 59 52 34
______________________________________ Said modification in the form of a liquid or solid dyeing preparation being suitable for the dyeing of fibrous materials consisting of cellulose esters or synthetic linear polyesters.
The modification being stable under dyeing conditions of the dyestuff of the formula ##STR3## characterized by an X-ray diffraction diagram with characteristic reflexes at the following glance angles θ with the relative intensities as given below: ______________________________________
[o] 2.45
6.30 10.07 11.00
11.35
11.70
12.36
13.55
14.80
15.85
63 100 30 48 83 88 86 59 52 34
______________________________________
Claim 2
Dependent Claim
59 words
The modification being stable under dyeing conditions of the dyestuff of the formula ##STR3## characterized by an X-ray diffraction diagram with characteristic reflexes at the following glance angles θ with the relative intensities as given below: ______________________________________
[o] 2.45
6.30 10.07 11.00
11.35
11.70
12.36
13.55
14.80
15.85
63 100 30 48 83 88 86 59 52 34
______________________________________
Claim 3
Dependent Claim
161 words
Process for the preparation of the β-modification stable under dyeing conditions of the dyestuff of the formula as defined in claim 1, wherein the dyestuff of the formula ##STR4## of the α-modification being unstable under dyeing conditions and being characterized by an x-ray diffraction diagram with characteristic reflexes at the following glance angles with the intensities as given below: ______________________________________
[o] 2.55 5.60 6.20 7.65 12.35 13.40
relative
intensity
78 40 59 30 38 100
______________________________________ is (a) heated in an aqueous suspension to a temperature between 60° C and 150° C, or (b) heated in an organic solvent to a temperature between 60° C and about 20° C below the boiling temperature of the organic solvent used, however, the upper limit of the temperature not exceeding 150° C, or (c) ground at a temperature between about 80° C and 90° C in the presence of a dispersing agent, or (d) dried at a temperature between 100° C and 120° C.
Claim 4
Dependent Claim
32 words
The process as claimed in claim 2, wherein the heating in an aqueous suspension to a temperature between 60° and 150° C is performed in the presence of a water-soluble organic solvent.
Claim 5
Dependent Claim
36 words
The process as claimed in claim 2, wherein the heating in an aqueous suspension to a temperature between 60° and 150° C is carried out in the presence of an anionic, cationic or non-ionic surface-active compound.