DE139060C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

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In patent 139059 it was shown that when dyeing with titanium salts and mordant dyes at the same time acetates or formates of alkaline earths or earths or basic salts of If the latter are used, deeper colors are obtained than when using titanium salts and Mordant dyes alone are colored.

The further experiments have now shown that deeper colorations are also obtained,

ίο if instead of the above salts as auxiliary salts in the Coloring can be applied:

Alkalis, sulfur alkalis, alkali carbonates, alkaline earths or alkaline reacting salts, z. B. water glass, borax, phosphoric acid soda or neutral alkali salts of acetic acid, formic acid, Chromic acid, ferrocyanoic, ferricyanic, rhodanic acid, sulphurous and hyposulphurous acid, or of fatty acids e.g. B. Soap. To carry out the dyeing process, the materials to be dyed are best left cold or warm impregnated with the mixture of titanium salts and stain dyes and then post-treated with cold or warm solutions of auxiliary salts.

So z. B. for dyeing chrome leather, the leather is impregnated by six hours of soaking in a cold mixture of equal parts of a solution of 10 g of titanium potassium fluoride and 50 g of logwood (decoction) to 1 water. After dyeing, without becomes 40

45

rinse for 15 minutes at 40 ° C. in the solutions of the following chemicals in 1 l of water post-treated: 20 cm of concentrated ammonia, 10 g of calcined soda or milk of lime, 10 g sodium bicarbonate, 20 g soda waterglass, 20 g borax, 50 g phosphoric acid sodium or thiosulphonic acid, or sulphurous acid, or acetic acid, or formic acid soda, or 50 g of potassium ferrocyanide or potassium ferricyanide or potassium rhodium or chromic acid Soda, or soda soap, or 10 kg of sodium sulfur.

The aftertreated colors are all significantly richer and darker than the original, staining rinsed with water only.

When using the acetates of the alkalis as auxiliary coloring salts, it is also advantageous to add the to pretreat coloring substances with the mixture of auxiliary salt and the dye and then develop the color by post-treatment with cold or warm titanium salt solution. One places z. B. for black tanned leather in a cooled solution for 12 hours of 50 g of logwood and 10 g of sodium acetate per liter of water and then takes 20 minutes in a 40 ° C. solution of 10 g of titanium potassium fluoride in liter of water.

This color is considerably richer than when sodium acetate was added to the blue wood would have been omitted.

Some dyes, ζ. Β. Bluewood, redwood and yellowwood dissolve in the presence of Sodium acetate lighter and clearer, and this gives it another benefit for 5 the above embodiment of the method, since the dyes because of the better solution apply better and more evenly.

The use of the aforementioned chemicals as auxiliary colorants thus allows under ίο otherwise the same working conditions, to get significantly deeper colors, it is special advantageous in cases where dyeing has to be carried out at low temperatures, such as, for. B. when dyeing leather.

Claims (1)

Patent claim: Improved process for dyeing with titanium salts and mordant dyes, featured by using the following, the acetates - or formates of the alkaline earths or earths or chemicals replacing basic salts according to the procedure of patent 139059: alkalis, Sulfur alkalis, alkali carbonates, finer alkaline salts such as bicarbonate, water glass, Borax, phosphoric acid soda, also the neutral alkali salts of acetic acid, formic acid, Ferrocyanoic, ferricyanic, rhodanic acid, hyposulphurous acid, sulphurous Acid, chromic acid and fatty acids.