C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 23/14 (2006.01) C07D 251/68 (2006.01) C09B 67/48 (2006.01) C11D 3/42 (2006.01) D06L 3/12 (2006.01)
Patent
CA 2238163
The present invention provides a hydrate of the 4,4'-di-triazinylamino-2,2'-di- sulfostilbene compound having the formula: Image in which M and M, 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 characterised by an X-ray diffraction pattern which is essentially as set out in the accompanying Figures 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.
Burkhard Andreas
Geoffroy Andre
Marti Erwin
Rohringer Peter
Schreiber Werner
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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