C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 67/30 (2006.01) C09B 7/02 (2006.01) D06P 1/22 (2006.01) D06P 1/673 (2006.01)
Patent
CA 2336643
Concentrated leuco indigo solutions useful for dyeing cellulosic textile material consist essentially of from 25 to 55% by weight of leuco indigo in the form of the leuco indigo salt, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol%, and water.
L'invention concerne des solutions de leucoindigo concentrées composées principalement de 25 à 55 % en poids de leucoindigo sous la forme d'un sel de leucoindigo, d'un mélange d'au moins deux hydroxydes métalliques alcalins dont la proportion respective ne dépasse pas 70 % en mole, dans une quantité qui correspond sensiblement à la quantité nécessaire en termes stoechiométriques à la transformation de leucoindigo en sel de leucoindigo neutre. Ces solutions contiennent enfin de l'eau. L'invention concerne la production de ces solutions leucoindigo et leur utilisation pour colorer des matières textiles cellulosiques.
Gang Manfred
Kruger Rudolf
Miederer Peter
Basf Aktiengesellschaft
Borden Ladner Gervais Llp
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