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US 4,401,473 AGranted
Use of dimethylphosphinylalkanephosphonic acid as a setting retarder in gypsum
AssigneeHoechst Aktiengesellschaft
InventorsHans-Jerg Kleiner, Volker Knittel, Gerhard Debus
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Abstract
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##
Claims1
Gypsum containing, as a setting retarder, a dimethylphosphinylalkanephosphonic acid of the general formula I ##STR13## in which n is 1 or 2.
Dependencies are inferred from the claim text.