Hoechst Aktiengesellschaft

Reinhard D Onges

Rainer Helwerth

Rudolf Ehrler

Uwe Bartz

Heiner Klehr

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

The present invention relates to succinimides of the formula I ##STR1## in which R.sup.1 and R.sup.2, independently of one another, are hydrogen, C.sub.1 -C.sub.24 -alkyl, C.sub.2 -C.sub.24 -alkenyl, C.sub.6 -C.sub.12 -cycloalkyl, C.sub.6 -C.sub.12 -cycloalkenyl, C.sub.6 -C.sub.12 -aryl, C.sub.1 -C.sub.24 -alkoxy, C.sub.1 -C.sub.24 -acyl, C.sub.1 -C.sub.24 -acyloxy, a hydroxyl, amino or sulfo group or a C.sub.1 -C.sub.24 -dialkylamino, C.sub.1 -C.sub.24 -acylamino, C.sub.1 -C.sub.24 -alkylsulfato, C.sub.1 -C.sub.24 -alkylsulfonato, C.sub.1 -C.sub.24 -alkylsulfito, C.sub.1 -C.sub.24 -alkylsulfinyl or C.sub.1 -C.sub.24 -alkoxycarbonyl radical, and R.sup.3 is a polyhydroxyalkyl radical of the formula ##STR2## in which R.sup.4 is --(CHOR.sup.7).sub.n --H, R.sup.5 is --(CHOR.sup.7).sub.m --H, R.sup.6 is --(CHOR.sup.7).sub.o --H where n+m+o is 2-6, and R.sup.7 is H or a carbohydrate attached in the form of a glycoside from the series comprising reducing sugars, a process for their preparation and their use.

Growing community of inventors

Bad Soden, Germany

Reinhard D Onges