Clariant Finance (Bvi) Limited

Guido Joseph Danhieux

Jon Walter Merkert

James Myron Hanna, Jr

Masato Nishioka

May N Szeto

Michel M Trawalter

Yi Lai Wang

Livius T Percy

Dwayne R Myers

Catherine S Ho

The invention relates to a Bunte salt azo dye composition comprising an azo dye containing at least one Bunte salt group. The resulting dye is water soluble material which is useful in the rapid dying of natural and synthetic fibers. The Bunte salt azo dye of the present invention can be used without requiring a mordanting step or a concurrent or pre-reducing step to condition fibers of animal hair to accept the dye to achieve strong color performance.

Bunte salt azo dye compound

Stable, pourable aqueous suspensions of solid particulate materials are provided, especially suspensions of sulfur dyes which are characterized a very low content of inorganic sulfides and inorganic polysulfides. The suspensions are produced using certain suspension stabilizing agents, particularly polysaccharides, such as xanthan gum, whose solutions in water are pseudoplastic. The suspensions may further comprise a non-sulfide reducing agent. An improved method is also provided for determining the the potential for such suspensions to release hydrogen sulfide upon being acidified at a given temperature, which method comprises acidifying a sample of the suspension to pH 2.9-3.7, capturing all of the hydrogen sulfide released during acidification in aqueous alkali and measuring the sulfide ion content of the aqueous alkali.

Stable liquid suspensions and method for analyzing same

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Charlotte, NC, United States of America

Guido Joseph Danhieux