Modifiers for gypsum slurries and method of using them

US7608347B2 · kind B2 · utility

Assignee

• UNITED STATES GYPSUM COMPANY · US

Inventors

• Dennis Mark Lettkeman · Watonga, US
• Michael P. Shake · Johnsburg, US
• Qingxia Liu · Vernon Hills, US
• John W. Wilson · Phoenix, US
• Brian Randall · Fairview, US
• David R. Blackburn · Wellington, GB

Key dates

• Filing date: Jun 9, 2006
• Grant date: Oct 27, 2009
• Expiry date: Dec 31, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/232
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An improved gypsum slurry that includes water, calcium sulfate hemihydrate, a polycarboxylate dispersant and a modifier. The modifier is chemically configured to improve the efficacy of the polycarboxylate dispersant. Preferred modifiers include cement, lime, slaked lime, soda ash, carbonates, silicates and phosphates.