US678884A - Process of producing blue sulfur dye. - Google Patents

Description

ADOLF KERTESZ, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR TO LEOPOLD GASS'ELLAK 00., OF SAME PLACE.

PROCESS OF PRODUCING BLUE SULFUR DYE.

$EEGIFICATION forming part of Letters Patent N 0. 678,884, dated July 23, 1901.

Application filed July 15, 1899- To aZZ whmn it may concern:

Be it known that I, Anonn KERIESZ, a citizen of Prussia, and a resident of Frankforton-the-Main, in the Province of Hesse-Nassau and Empire of Germany, have invented certain new and useful Improvements in Producing Oxidation Dyestuffs on the Fiber, of which the following is a specification.

The object of this invention is to convert blacks produced by dyeing with the hereinafter-mentioned dyestuffs into blues by treatment on the fiber in accordance with the hereinafter-described process.

Under the denomination of immedial blac Vida-l black, kyrogene blue, &c., dyestuffs have been brought on the market which are obtained by heating various primary substances with sulfur and sulfids. All these dyestuffs have the property of dissolving easily in water in the presence of sulfid of sodium and to dye directly the vegetable fiber in such a solution. The said dyestuffs have already been subjected to oxidation processes on the fiber. For instance, the greenish shade of vidal black has been changed into a black by the action of bichromates and immedial black into a blue by means of peroxids. The oxygen of the air also reacts on vidal black, though but slowly, as its direct green dyeings when exposed to the air are turned into a pretty intense black. I have, however, found that the oxygen of the air has quite a diiferent effect in the presence of steam of high tension or overheated. Then Vidal black is changed into a greenish blue, immedial black into a reddish dark blue, kyrogene blue into a black blue, &'c. This observation is of great technical importance, as the application of this process is exceedingly simple and the resulting colors are of a hitherto unsurpassed fastness.

The operation is executed in an apparatus,

Serial No. 723,990. specimens.)

the shape of which depends on the material to be dyed, (loose cotton, yarn, cops, &o.,) constructed on the principle that the goods are treated simultaneously with air and steam at temperatures of more than 100 centigrade. For the success of the reaction it is necessary that the fiber shows alkaline reactions. As the dyeing process is carried out in a bath containing sulfid of sodium, which possesses strong alkaline reaction, it is generally sufficient to treat the material directly without Washing or drying it. If this is not possible, the requisite alkaline reaction may be produced by introducing some ammonia-gas.

The term air as hereinafter usedin my claims is intended to include atmospheric air or an equivalent supply of oxygen.

Having thus described my invention and in what manner the same can be performed,what I claim as new, and desire to secure by Letters Patent, is

1. The process of producing blue dyes by treating with a mixture of air and steam at a temperature of over 100 Centigrade, in the presence of an alkali, fiber previously dyed with the sulfur dyes obtained by treating pri mary substances with sulfur and sulfids, as and for the purpose hereinbefore set forth.

2. The process of producing blue dyes by treating with a mixture of air and steam, in the presence of an alkali, fiber previously dyed with the sulfur dyes obtained by treating primary substances with sulfur and sulfids, as and for the purpose hereinbefore set forth.

Signed at Frankfort-on-the-Main, in the Province of Hesse-Nassau and Empire of Germany, this 22d day of June, A. D. 1899.

, ADOLF KERTESZ.

Witnesses:

JEAN GRUND, SIMON W. HANAUER.