Preparation of granules of dyes, optical whiteners or photoactiv

Details Preparation of granules of dyes, optical whiteners or photoactiv Preparation of granules of dyes, optical whiteners or photoactiv

1989-06-02

1991-07-09

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dry dye composition other than mere mixture of two or more...

Dye in specified form other than mere powder

8543, 8654, 8661, 8673, 8675, 8680, 8685, 8687, 23313R, 106316, 106401, 106902, 25230121, 540139, 540140, B01D 118, C09B 6706, C11D 339, D06L 312

Patent

active

050302442

ABSTRACT:
Process for the preparation of granules by spray-drying of an aqueous suspension having a solids content of greater than/equal to 30% and containing at least one dye, fluorescent brightener or photoactivator and one condensation product from naphthalenesulfonic acid and formaldehyde and, if necessary, further auxiliaries and/or diluents. The spray-drying is carried out at a feed pressure of 50-150 bar, the residual moisture content of the product is less than 4%, and the granules obtained are in particular very pressure resistant and abrasion resistant.

REFERENCES:
patent: 2574597 (1951-11-01), Salvin et al.
patent: 4198268 (1980-04-01), Frei et al.
R. Putzar et al., Chem. Abst. 76142375u pp. 80-81 (1972).
W. Happe et al., Chem. Abst.,-,6141.
E. Daubach et al., Chem. Abst., vol. 78, 31336d, pp. 74-75 (1973).

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