Hoechst Aktiengesellschaft

Gerhard Debus

Volker Knittel

Hans-Jerg Kleiner

Friedrich Girg

Heinz-Josef Mann

Martin Ludke

Thickening systems for water-based building material mixes, composed of 0.01 to 2% by weight of a water-soluble cellulose ether, 0.01 to 2% by weight of polyvinyl alcohol and 0.005 to 1% by weight of boric acid or salts thereof, the respective percentages being based on the dry substance content of the building material mix. Due to the addition of boric acid or borax, these thickening systems have an improved thickening action compared with thickening mixtures composed only of cellulose ether and polyvinyl alcohol.

Thickening system for water-based building material mixes

The invention relates to dimethylphosphinylalkanephosphonic acids of the general formula I, in which n is 1 or 2, which are used as setting retarders for gypsum. ##STR1##

Use of dimethylphosphinylalkanephosphonic acid as a setting retarder in

This invention relates to an additive for concrete and mortar comprising a cellulose ether and a non-ionic, low-foaming surface-active agent.

Additive for concrete or mortar and the use thereof

This invention relates to an additive combination, for water-containing, setting building materials, in particular those of cement, based on an anionic polyelectrolyte, and including at least one nonionic, low-foaming surfactant. The invention also relates to a process for plasticizing water-containing, setting building materials.

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Assmannshausen, Germany

Gerhard Debus