.beta.-crystalline modification of diasazo acid dyestuff

Details .beta.-crystalline modification of diasazo acid dyestuff .beta.-crystalline modification of diasazo acid dyestuff

1985-10-15

1989-10-24

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534831, 534887, 8681, C09B 6724, C09B 6748, C09B 6754, D06P 139

Patent

active

048763330

ABSTRACT:
A crystalline modification, designated ".beta.", of the dye of the structure ##STR1## The .beta.-crystalline modification of the dye is easier to isolate from water and gives filter cakes of higher solids and color content. The .beta.-form is also more suitable for making liquid formulations of the dye; the liquid formulations of the crystalline modification have lower viscosity and better dispersion stability than liquid formulations of non-modified form. The .beta.-modification of the dye is obtained by heating an aqueous slurry of the dye at about 90.degree.-95.degree. C. and pH of 8.5 to 9.5 until the modification is complete. The crystalline modification of the dye gives Debye-Scherrer X-ray diffraction patterns substantially different from the non-modified form.

REFERENCES:
patent: 2519924 (1950-08-01), Powell
patent: 2573851 (1951-11-01), Lacey et al.
patent: 2765300 (1956-10-01), Hein et al.
patent: 2981729 (1961-04-01), Kesler et al.
patent: 3862119 (1975-01-01), Stingl
patent: 3932376 (1976-01-01), Feeman
patent: 3956270 (1976-05-01), von Rambach et al.
patent: 4002605 (1977-01-01), Balsley et al.
patent: 4014866 (1977-03-01), Henning
patent: 4045425 (1977-08-01), Hunter
patent: 4074965 (1978-02-01), Kruse et al.
patent: 4332588 (1982-06-01), Eugster et al.
patent: 4468230 (1984-08-01), Thomas et al.
patent: 4474577 (1984-10-01), Sandefur et al.
patent: 4567171 (1986-01-01), Mangum
Chemical Abstracts, vol. 99, #124028d and Formula Index, p. 1938F (1983).
Biedermann, J. Soc. Dyers & Colourists, vol. 87, No. 4, pp. 105 to 111 (1971).

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