Patent 7241819 was granted and assigned to Rohm and Haas on July, 2007 by the United States Patent and Trademark Office.
A two-pack cementitious composition consisting ofiii) an alkaline component comprising gypsum, an alkaline polymer, water and a hydration inhibitor, which is stable in a fluid state and which can be set and hardened upon the addition of an hydration activator, andiv) an acidic component comprising an acid soluble hydration activator,is suitable for forming a self-levelling floor composition. The self-levelling floor composition may be used in a method of levelling a floor.