Hydrates of the disodium salt or dipotassium salt of...

C - Chemistry – Metallurgy – 07 – C

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C07C 309/32 (2006.01) C11D 3/42 (2006.01) D06L 3/12 (2006.01)

Patent

CA 2099297

Case 2-19142/A Abstract of the disclosure Hydrates of the disodium salt or dipotassium salt of 4,4'-bis(2-sulfostylyl)biphenyl The present invention relates to novel hydrates of the disodium salt or dipotassium salt of 4,4'-bis(2-sulfostyryl)biphenyl characterised by their water of hydration content, to the crystal forms associated therewith, characterised 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.

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