Bleaching and dyeing; fluid treatment and chemical modification – Multiple chemically diverse fibers or fibers with different... – Synthetic polyamide
Patent
1983-07-14
1985-04-30
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Multiple chemically diverse fibers or fibers with different...
Synthetic polyamide
8641, 8643, 8676, 8679, 8924, 260370, 260374, 260371, C09B 134, D06P 306
Patent
active
045141878
ABSTRACT:
The present invention relates to a process for the differential dyeing of such polyamide fibres and materials containing polyamide fibres as are made of components which differ in dyeability, or mixtures of polyamide fibres, with dyes or dye mixtures, which comprises using for dyeing these materials an aqueous liquor which contains a dye of the formula ##STR1## in which A.sub.1 is hydrogen or C.sub.1-4 alkyl and R is a C.sub.2-5 -alkanoyl, C.sub.3-6 -alkenoyl, (C.sub.1-4 -alkoxy)carbonyl, phenoxycarbonyl, C.sub.1-4 -alkylsulfonyl or phenylsulfonyl radical which can be substituted in the alkyl, alkenyl, alkoxy, phenoxy or phenyl moiety, or a mixture of a dye of the formula (1) with a monosulfo-containing anthraquinone dye, and to those dyes of the formula (1) in which A.sub.1 is as defined above and R is a C.sub.1-4 -alkylsulfonyl or phenylsulfonyl radical which can be substituted in the phenyl moiety by C.sub.1-4 -alkyl.
Even at low dyeing temperatures, the process of the invention gives ombre effects rich in contrast and, on admixture of other suitable acid dyes, multicolor effects on polyamide fibres which are suitable for differential dyeing.
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Bouwknegt Thys
Raisin Helmut
Schutz Hans U.
Ciba-Geigy Corporation
Clingman A. Lionel
Mansfield Kevin T.
McC. Roberts Edward
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