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Dyeing-method

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Dyeing method

Details

Inventors: Meszaros, Laszlo A.;
Assignee: Sandoz Ltd. (Basle, CH)
Primary Examiner: Lieberman; Paul
Assistant Examiner: Darland; J. E.
Attorney, Agent or Firm: Sharkin; Gerald D., Vila; Richard E., Doyle; Thomas C.

Cellulosic substrates are dyed by a continuous dyeing method with dispersed sulfur dyes using a reducing sugar, especially glucose, as the reducing agent for the dye.

DETAILED DESCRIPTION What is claimed is: 1.
A method for the continuous dyeing or printing of a cellulose-containing textile substrate which comprises continuously applying to said substrate ane aqueous dispersion of a sulfur dye and, either simultaneous therewith or subsequently thereto, continuously applying to said substrate a reducing sugar together with alkali and then heating the thus-treated substrate with steam to a temperature of 98.
degree.
C.
to 105.
degree.
C.
to effect reduction of the dye thereon, said method being effected using conventional continuous dyeing or printing equipment wherein the heating is effected in a non-pressurized zone.
2.
A method according to claim 1 wherein the sulfur dye is applied to the substrate by padding.
3.
A method according to claim 1 wherein the aqueous dispersion of the sulfur dye contains the reducing sugar and alkali.
4.
A method according to claim 1 which comprises applying to the substrate the aqueous dispersion of the sulfur dye and subsequently applying to the substrate a solution of the reducing sugar in aqueous alkali.
5.
A method according to claim 1 wherein the reducing sugar is glucose.
6.
A method according to claim 1 wherein the sulfur dye is free of inorganic sulfides.
7.
A method according to claim 1 wherein the sulfur dye is selected from the group consisting of C.
I.
Sulfur Blacks 1, 2 and 18, C.
I.
Sulfur Greens 2 and 36, C.
I.
Sulfur Blues 7, 13 and 43, C.
I.
Sulfur Reds 10 and 14, C.
I.
Sulfur Brown 37 and C.
I.
Sulfur Yellow 22.
8.
A method according to claim 3 wherein the reducing sugar is the sole reducing agent added to the aqueous dispersion of the sulfur dye.
9.
A method according to claim 4 wherein the reducing sugar is the sole reducing agent added to the aqueous alkali.
10.
A cellulosic textile substrate dyed by the method of claim 1.
11.
A method according to claim 1 wherein the sulfur dye has a polysulfur content no greater than 7% by weight, based on the dry weight of the dye.
12.
A method according to claim 1 wherein the sulfur dye has a polysulfur content in the range 0 to 3% by weight, based on the dry weight of the dye

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