solubilising

The unfixed dye is treated with a cationic agent which forms an ionic bond with the water solubilising group on the dye molecule.

Chapter 8 1969

Complexes may be formed between dyes and metals (as in 1: 2 metal complex dyes) or between cationic after-treating agents (see Cationic after-treating agent) and dyes containing anionic water solubilising groups (see Anionic dye).

Chapter 4 1969

The practical importance of the solubilising effect of Neradol D relating to solid Argentine quebracho extract is demonstrated in the following series of investigations carried out by the author: --

Synthetic Tannins Georg Grasser

Solution 1 swells the pelt to a considerable extent without, however, solubilising it.

Synthetic Tannins Georg Grasser

A special feature of Neradol D is its property of solubilising phlobaphenes, which may be ascribed to its contents of sulphonic acids or their salts.

Synthetic Tannins Georg Grasser

Furthermore, the common methods of using alkalies as tannin-solubilising agents with the consequent running off and waste of alkaline tan liquors are here substituted by a method leaving liquors rich in tannin and Neradol, and which may be used in the ordinary procedure of tannage.

Synthetic Tannins Georg Grasser

One of the most striking properties of this tanning matter is its solubilising effect on natural tannins and the phlobaphenes; this property may mainly be compared to the similar one of other condensed sulphonic acids in their behaviour towards natural tannins.

Synthetic Tannins Georg Grasser

Neradol D liquor, but do also show higher contents in soluble non-tannins, which consist mainly of lime (2.12 per cent.) and sodium salts (1.8 per cent.), thus establishing the fact of the sensitiveness of Neradol D to alkalies in addition to its lime-solubilising effects.

Synthetic Tannins Georg Grasser

In order to determine its phlobaphene-solubilising effects, samplesof the product were mixed with concentrated quebracho extract in the proportions 5,10, 20, and 30 per cent. on the weight of extract, and the following observations made: -- 5 and 10 per cent. were without effect,

Synthetic Tannins Georg Grasser

This clearly proves that free and condensed phenolsulphonic acids as such are not capable of completely solubilising phlobaphenes, whereas the sodium salts of free and condensed phenolsulphonic acids possess this property.

Synthetic Tannins Georg Grasser