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US 6,890,359 B1Granted
Lightening dyed textile material
AssigneeBASF SE
InventorsReinhard Schneider, Peter Maier, Eberhard Beckmann, Ulrich Karl
Life of this patent
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Abstract
Described is a process for lightening or partially decolorizing vat- or sulfur-dyed textile materials, which comprises treating the material with aminoalkanesulfinic acids in a neutral or weakly acidic medium, and preparations of the aminoalkanesulfinic acids for carrying out this process.
Claims10
A process for controlled partial decolorization of vat- or sulfur-dyed or -printed cellulosic textile material, which comprises treating the cellulosic textile material to be lightened or decolorized with one or more compounds of the formula I
- R13-zN(CR2R3—SO2M)z (I)
- where
- z is 1, 2 or 3,
- R1 is
- a) when z is 1 or 2:
- hydrogen, alkyl of 1 to 18 carbon atoms or HOCH2CH2,
- b) when z is 2:
- additionally OH, and
- c) when z is 1:
- either as defined under a) independently for the two R1 radicals or as defined under a) in one instance and as defined under b) in the other,
- R2 and R3, which may be the same or different, are each hydrogen or alkyl of 1 to 4 carbon atoms subject to the proviso that together they have not more than 0.4 carbon atoms, and
- M is one equivalent of a mono- or divalent metal atom,
- at pH 4-7, optionally followed by an aftertreatment with hydrogen peroxide.
10 more elements
Dependencies are inferred from the claim text.