Hoechst Aktiengesellschaft

Volker Hemmerling

Reinhold Deubel

Heinz Uhrig

Wolfgang Teige

Max Grossmann

Werner Reitz

A sulfosuccinic acid semi-ester of the formula ##STR1## wherein A is a group of the formula ##STR2## B is a hydrogen atom and/or a group of the meaning given for A, X is an ethylene or propylene group, R is a saturated alkyl radical having from 6 to 14 carbon atoms, Me is a hydrogen atom, an alkali metal atom or an equivalent of an alkaline earth metal atom, n is an integer from 2-25 and z is an integer from 1-9. These sulfosuccinic acid semi-esters are prepared by oxethylating multinuclear alkyl phenols, reacting the oxethylates so obtained with maleic acid anhydride to the maleic acid semi-esters and adding to these semi-esters alkali metal or alkaline earth metal sulfites. Because of their slight tendency to foaming and their poor inherent colour they are excellent dispersing agents for the preparation of highly pigmented pigment preparations of good flow properties which are used in aqueous flexo prints.

Sulfonsuccinic acid semi-esters, process for their preparation and their

A pigment composition for the dyeing of polyacrylonitrile polymers and copolymers prepared by adding a polyacrylonitrile polymer or copolymer as a support in the preparation of formation of the pigment and working up the pigment in usual manner. As support material there are suitable as well pure polyacrylonitrile as copolymers containing, in addition to acrylonitrile, one or more other copolymerizable monoolefinic monomers. The amount of support material to be added ranges from 20 to 80, preferably from 30 to 60% by weight, calculated on the finished composition. As pigments there may be used those which are prepared or formed in purely aqueous systems or in aqueous systems containing organic solvents, for example azo pigments or pigments of perylene tetracarboxylic acid or naphthalene tetracarboxylic acid, dioxazines, phthalocyanines, quinacridones, indigoids, anthraquinone dyestuffs, iron oxide and titanium dioxide. The pulverulent compositions thus obtained are especially suitable for the dyeing of spinning solutions of polyacrylonitrile fibers and the modifications thereof. They may be dispersed by simply stirring them into an appropriate spinning solvent.

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Kelkheim (Taunus), Germany

Volker Hemmerling