White modification of a bis-triazinyl amino stilbene optical bri

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

1983-10-11

1985-10-29

Albrecht, Dennis L.

Compositions

Organic luminescent material containing compositions

Optical brightening compositions

8648, 252524, 252543, 5441932, C07D25154, C09K 1106, C11D 342, D06L 312

Patent

active

045499802

ABSTRACT:
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-phenylamino-1,3,5-triazinyl-6-amino)-stilbene-2,2'-d isulphonic acid is neutralized with a sodium base such as caustic and exposed to temperatures above about 65.degree. 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.

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patent: 4311605 (1982-01-01), Eckhardt
patent: 4326982 (1982-04-01), Neumann

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