Stable purified aqueous solutions of fluorescent whitening agent

Details Stable purified aqueous solutions of fluorescent whitening agent Stable purified aqueous solutions of fluorescent whitening agent

1983-10-27

1984-08-28

Demers, Arthur P.

Compositions

Organic luminescent material containing compositions

Optical brightening compositions

5441932, C09K 1106

Patent

active

044683413

ABSTRACT:
A process for the preparation of a stable aqueous solution of the tetrasodium salt of 4,4'-bis(4-p-sulfo-anilino-6-diisopropanolamino-s-triazin-2-ylamino)-2,2'- stilbenedisulfonic acid is disclosed. The resultant solution is substantially free from destabilizing organic impurities and destabilizing inorganic salts. In the absence of these destabilizing materials the solution does not require the co-solvents of the prior art.

REFERENCES:
patent: 3676139 (1972-07-01), Amano et al.
patent: 3766083 (1973-10-01), Langstroth
patent: 3853583 (1974-12-01), Langstroth
patent: 3925260 (1975-12-01), Tscharner
patent: 3951965 (1976-04-01), Mengler et al.
patent: 4024071 (1977-05-01), Frigeli
patent: 4112226 (1978-09-01), Eymond
patent: 4216111 (1980-08-01), Thompson
patent: 4252604 (1981-02-01), Fleck et al.

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