Use of dimethylphosphinylalkanephosphonic acid as a setting retarder in gypsum

US4401473A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Jerg Kleiner · Kronberg, DE
• Volker Knittel · Wiesbaden, DE
• Gerhard Debus · Idstein, DE

Key dates

• Filing date: Feb 23, 1982
• Grant date: Aug 30, 1983
• Expiry date: Feb 23, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/5312
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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##