Crystalline form of acetamido-amino-nitro-azo-benzene dye and a

Details Crystalline form of acetamido-amino-nitro-azo-benzene dye and a Crystalline form of acetamido-amino-nitro-azo-benzene dye and a

1989-12-05

1990-10-02

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dry dye composition other than mere mixture of two or more...

Dye in specified form other than mere powder

8524, 8532, 8533, 8690, 8922, 534575, C09B 6702, C09B 2908, D06P 118

Patent

active

049604350

ABSTRACT:
A crystalline form of the dye represented by the following formula (1): ##STR1## characterized by an X-ray diffraction pattern having a strong peak at the angle of diffraction (2.theta.) of 23.2.degree. and relatively strong peaks respectively at the angles of diffraction (2.theta.) of 8.3.degree., 12.3.degree., 20.8.degree., 21.9.degree., 25.0.degree., 27.1.degree., 29.2.degree. and 30.8.degree. according to X-ray powder diffractometry through the use of a Cu-K.alpha. line and a process for preparing the same by heat-treating a heat-instable crystalline form of the dye represented by the formula (1) in water, water containing a water-soluble organic solvent, or water containing an anionic or nonionic surfactant at a temperature of 40.degree. C. or above.
It withstands dyeing at high temperature, e.g. 130.degree. C. or higher, to provide dyed fibers having excellent fastness properties.

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