Setting retarder

US4124406A · kind A · utility

Assignee

• Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

• Helmut Knorre · Seligenstadt, DE
• Manfred Langer · Hanau, DE
• Wolfgang Fischer · Eppelheim, DE

Key dates

• Filing date: Sep 14, 1976
• Grant date: Nov 7, 1978
• Expiry date: Sep 14, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B24/06
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Gypsum plaster having a delayed setting time is made by adding a mixture of mesotartaric acid and l-tartaric acid or d,l-tartaric acid or a mixture of l-tartaric acid and d,l-tartaric acid to the gypsum plaster.