Process for the preparation of solid composition of water-solubl

Details Process for the preparation of solid composition of water-solubl Process for the preparation of solid composition of water-solubl

1981-03-26

1983-06-28

Tungol, Maria Parrish

Bleaching and dyeing; fluid treatment and chemical modification

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

8527, C09B 6704, C09B 6754, C09B 6706

Patent

active

043903428

ABSTRACT:
A process for producing solid dye compositions, which process comprises passing an aqueous solution or suspension of at least one water-soluble crude dye, to effect separation of synthesis by-products having a molecular weight of below 500 and partial separation of water, through a semipermeable membrane, subsequently drying the resulting aqueous preparation which has become more highly concentrated, and optionally adding further additives before and/or after passage of the aqueous solution or suspension through the semipermeable membrane, these additives being added beforehand only when they do not become separated by the membrane.
There are obtained by this process low-dust to dust-free compositions which are distinguished by high mechanical strength, high bulk density, free-flowing characteristics and good dissolving behavior. Employing these compositions it is possible to prepare low-foam to foam-free aqueous dye liquors having very good solution stability, even in the presence of electrolytes.

REFERENCES:
patent: 4295851 (1981-10-01), Neumann et al.

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