Bayer Aktiengesellschaft

Reinhard Nebeling

Reinhold Hornle

Hans-Heinz Molls

Willy Schiwy

Karlheinz Wolf

Vaclav Kaspar

Richard Schwaebel

Franz Schade

Hans-Werner Petroll

Bruno Zinz

Chemical reaction products, obtained in an alkaline medium and which require the addition of a dispersing agent, are neutralized by addition of a free surface-active acid to which, after its preparation, basic agents have not been added or have only been added up to a pH value of 3.

Process for the neutralization of basic reaction compositions

Condensation products which are obtained by co-condensation, in an acid aqueous medium, of terphenylsulphonic acids, naphthalenesulphonic acid, bis-(4-hydroxyphenyl) sulphone and compounds which release formaldehyde are used as tanning agents for the production of leather and as re-tanning agents for re-tanning mineral-tanned leather.

Condensation products of terphenylsulphonic acids, naphthalenesulphonic

Dyestuff formulations which contain anionic, water-soluble dyestuffs or developable dyestuffs and salts of diaryl ether-sulphonic acids are suitable for the preparation of padding liquors, dyebaths and printing pastes.

Dyestuff formulations containing salts of diaryl ether sulfonic acids

Dyestuff dispersions and dyestuff solutions free from salt or at least having a low salt content are obtained in that the diazotization is carried out with addition of free dispersing agent acid to which, after the synthesis, either no basic agents are added or basic agents are added only up to a pH value of 3. The disclosed process gives dyestuff compositions of low salt content and results in readily dispersible dyestuffs when water insoluble dyestuffs are prepared and stable solutions when water soluble dyestuffs are prepared. The process is widely applicable and chemical constitution of the dyestuffs is conventional.

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Leverkusen, Germany

Reinhard Nebeling