Foamed slurry and building panel made therefrom

US8088218B2 · kind B2 · utility

Assignee

• UNITED STATES GYPSUM COMPANY · US

Inventors

• David R. Blackburn · Wellington, GB
• Runhai Lu · Vernon Hills, US
• Sharon L. Tracy · Buffalo Grove, US
• Qingxia Liu · Vernon Hills, US
• James R. Wittbold · Des Plaines, US
• Bruce L. Petersen · Lisle, US
• Alfred C. Li · Naperville, US
• John L. Fall · Bedford, US
• Michael P. Shake · Johnsburg, US
• Chris C. Lee · San Jose, US

Key dates

• Filing date: Aug 17, 2007
• Grant date: Jan 3, 2012
• Expiry date: Jun 8, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/0062
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A gypsum slurry is described that includes water, a hydraulic component comprising at least 50% calcined gypsum by weight based on the dry weight of the hydraulic component, foam, a defoamer and a polycarboxylate dispersant. In some embodiments of the invention, the defoamer is combined with the dispersant prior to being added to the gypsum slurry. The defoamer and dispersant can be added as a physical mixture, wherein the defoamer is attached onto the dispersant polymer, or a combination thereof. In some embodiments, a gypsum building panel is made from the gypsum slurry.