Hoechst Aktiengesellschaft

Se Tylose Gmbh & Co. Kg

Heiner Klehr

Uwe Bartz

Reinhard Donges

Reinhard D Onges

Harald Kempf

The present invention relates to alkyl hydroxyalkyl cellulose ethers which contain a sulfoalkyl group as a further substituent, to a process for the preparation of these cellulose ethers and to building material mixtures which are based on gypsum, hydrated lime or cement and contain alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups.

Alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups

Alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl substituents

The present invention relates to the use of carboxymethylated methyl hydroxyethyl cellulose ethers or methyl hydroxypropyl cellulose ethers having a DS.sub.alkyl from 1.0 to 2.0, a DS.sub.carboxyalkyl from 0.005 to 0.6 and an MS.sub.hydroxyalkyl from 0.05 to 1 as an additive to mixtures of hydrated lime and cement, and to the mixtures of hydrated lime and cement obtained in this way.

Use of carboxymethylated methyl hydroxyethyl cellulose ethers or methyl

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Mainz, Germany

Heiner Klehr