The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2020
Filed:
Nov. 17, 2015
Applicant:
Saint-gobain Placo, Suresnes, FR;
Inventors:
Assignee:
SAINT-GOBAIN PLACO, Suresnes, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 28/14 (2006.01); C04B 22/08 (2006.01); C04B 24/42 (2006.01); C04B 111/28 (2006.01); C04B 111/34 (2006.01);
U.S. Cl.
CPC ...
C04B 28/14 (2013.01); C04B 22/085 (2013.01); C04B 24/42 (2013.01); C04B 2111/28 (2013.01); C04B 2111/34 (2013.01); Y02W 30/92 (2015.05); Y02W 30/94 (2015.05);
Abstract
The present invention provides calcium sulphate-based product having reduced shrinkage after exposure to high temperatures, the product comprising gypsum, a pozzolan source (e.g. in an amount between 4-27 wt %) and a metal salt additive (in an amount between 0.5 and 10 wt %). The pozzolan source may be selected from a kaolinitic clay material, fly ash, rice husk ash, diatomaceous earths, volcanic ashes and pumices, micro-silica, silica fume and silicone oil. The metal salt additive may be a metal salt which decomposes between a temperature of 300-500° C. to yield a metal oxide, e.g. magnesium nitrate.