Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Andre Geoffroy

Andreas Burkhard

Josef Zelger

Erwin Marti

Peter Rohringer

Thomas Ehlis

Werner Schreiber

Karlheinz Franke

The present invention provides a hydrate of the 4,4'-di-triazinylamino-2,2'-di-sulfostilbene compound having the formula: ##STR1## in which M and M.sub.1 independently represent hydrogen, an alkaline-, an alkaline earth metal or ammonium, x is a number within the range of from 1 to 30, and the crystal form of the hydrate (I) being characterized by an X-ray diffraction pattern which is essentially as set out in the accompanying FIGS. 1 to 11; or a mixture containing one or more of the hydrates of the 4,4'-di-triazinylamino-2,2'-di-sulfostilbene compound having the formula (I); processes for the preparation of the new hydrates; and the use of the new hydrates for the preparation of concentrated aqueous formulations of fluorescent whitening agents.

Triazinylaminostilbene compounds

The present invention relates to novel hydrates of the disodium salt or dipotassium salt of 4,4'-bis(2-sulfostyryl)biphenyl characterized by their water of hydration content, to the crystal forms associated therewith, characterized by their X-ray diffraction pattern, to processes for the preparation, and to their use for the preparation of concentrated formulations of fluorescent whitening agents.

Hydrates of the disodium salt or dipotassium salt of

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Habsheim, France

Andre Geoffroy