White modification of a bis-triazinyl amino stilbene optical...

Details White modification of a bis-triazinyl amino stilbene optical... White modification of a bis-triazinyl amino stilbene optical...

C - Chemistry, Metallurgy

07

D

260/249.2

C07D 403/12 (2006.01) C07D 251/68 (2006.01) D06L 3/12 (2006.01)

Patent

CA 1215368

Mo-2533 WHITE MODIFICATION OF A BIS-TRIAZINYL AMINO STILBENE OPTICAL BRIGHTENER AND A PROCESS FOR MAKING THE SAME ABSTRACT OF THE DISCLOSURE The present invention is concerned with the modification of the sodium salt of a known optical brightener to obtain a white crystalline material. The commercially available 4,4'-bis-(2-anilino-4-phenyl- amino-1,3,5-triazinyl-6-amino)-stilbene-2,2'-disul- phonic acid is neutralized with a sodium base such as caustic and exposed to temperatures above about 65°C as an aqueous slurry containing some undissolved disodium salt. The water solubility of this salt may be inhibited by the addition of an electrolyte and the product may be recovered by spray drying. Mo-2533

465092

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