Brian S Randall

US Patent:

7572328, Aug 11, 2009

Filed:

Jun 14, 2005

Appl. No.:

11/152661

Inventors:

Dennis M. Lettkeman - Watonga OK, US
Qingxia Liu - Vernon Hills IL, US
John W. Wilson - Fairview OK, US
Brian S. Randall - Fairview OK, US
David R. Blackburn - Barrington IL, US
Michael P. Shake - Johnsburg IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

C04B 11/00

US Classification:

106772, 106778, 106823, 524 5

Abstract:

A slurry is made including water, at least 50% by weight calcium sulfate hemihydrate, and a specific polycarboxylate dispersant prepared using at least three repeating units. A first repeating unit is a vinyl ether-type repeating unit. A second repeating unit includes a maleic acid-type repeating unit. A third repeating unit includes an acrylic acid-type repeating unit. The polymer dispersant has a molecular weight of from about 20,000 to about 80,000 Daltons. The slurry made from this composition can be made at reduced water levels to speed drying and reduce drying costs.

US Patent:

7572329, Aug 11, 2009

Filed:

Jun 9, 2006

Appl. No.:

11/450086

Inventors:

Qingxia Liu - Vernon Hills IL, US
David R. Blackburn - Barrington IL, US
Michael P. Shake - Johnsburg IL, US
Brian Randall - Fairview OK, US
John W. Wilson - Fairview OK, US
Dennis M. Lettkeman - Watonga OK, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

C04B 11/00

US Classification:

106778, 524 4, 524 5, 264333

Abstract:

In a method of making a gypsum slurry, a polycarboxylate dispersant, a modifier and a hydraulic material comprising stucco are selected for use in the slurry. These components are then combined with water to form a slurry, where the modifier is added to the slurry prior to formation of a slurry phase by the water, the stucco and the dispersant. The modifier has been shown to be less effective when added after the dispersant and stucco have been contacted in an aqueous slurry. In a preferred embodiment, an amount of stucco is obtained and the modifier and dispersant are selected. A predissolved solution of a dispersant and modifier is prepared in water to form a solution prior to the addition of the stucco. After mixing the solution, the stucco is added to form the slurry. Optionally, the slurry is then shaped into a product and allowed to set.

US Patent:

7608347, Oct 27, 2009

Filed:

Jun 9, 2006

Appl. No.:

11/450068

Inventors:

Dennis M. Lettkeman - Watonga OK, US
Michael P. Shake - Johnsburg IL, US
Qingxia Liu - Vernon Hills IL, US
John W. Wilson - Fairview OK, US
Brian Randall - Fairview OK, US
David R. Blackburn - Barrington IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

B32B 13/00

US Classification:

428703, 106772, 106773, 106774, 106776, 106778

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.

US Patent:

7767019, Aug 3, 2010

Filed:

Jun 9, 2006

Appl. No.:

11/449924

Inventors:

Qingxia Liu - Vernon Hills IL, US
Michael P. Shake - Johnsburg IL, US
David R. Blackburn - Barrington IL, US
John W. Wilson - Fairview OK, US
Brian Randall - Fairview OK, US
Dennis M. Lettkeman - Watonga OK, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

C04B 11/00
C04B 24/04

US Classification:

106778, 106772, 106823, 524 4, 524 5

Abstract:

A gypsum slurry includes water, a hydraulic component including stucco and a polycarboxylate dispersant. The dispersant has two repeating units wherein the first repeating unit is an olefinic unsaturated mono-carboxylic acid repeating unit or an ester or salt, and the second repeating unit is a vinyl or allyl group bound to a polyether by an ether linkage. The slurry can be made into a gypsum panel.

US Patent:

7776462, Aug 17, 2010

Filed:

Nov 10, 2009

Appl. No.:

12/615857

Inventors:

Qingxia Liu - Vernon Hills IL, US
Michael P. Shake - Johnsburg IL, US
David R. Blackburn - Barrington IL, US
John W. Wilson - Fairview OK, US
Brian Randall - Fairview OK, US
Dennis M. Lettkeman - Watonga OK, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

B32B 13/00

US Classification:

428703, 442386, 5230917, 106778

Abstract:

A gypsum slurry includes water, a hydraulic component including stucco and a polycarboxylate dispersant. The dispersant has two repeating units wherein the first repeating unit is an olefinic unsaturated mono-carboxylic acid repeating unit or an ester or salt, and the second repeating unit is a vinyl or allyl group bound to a polyether by an ether linkage. The slurry can be made into a gypsum panel.

US Patent:

7932308, Apr 26, 2011

Filed:

Jul 30, 2009

Appl. No.:

12/512612

Inventors:

Dennis M. Lettkeman - Watonga OK, US
Michael P. Shake - Johnsburg IL, US
Qingxia Liu - Vernon Hills IL, US
John W. Wilson - Fairview OK, US
Brian Randall - Fairview OK, US
David R. Blackburn - Barrington IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

C04B 11/00

US Classification:

524 4, 524 5, 524130, 106778

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.

US Patent:

20060278127, Dec 14, 2006

Filed:

Jun 14, 2005

Appl. No.:

11/152418

Inventors:

Qingxia Liu - Vernon Hills IL, US
Michael P. Shake - Johnsburg IL, US
David R. Blackburn - Barrington IL, US
John W. Wilson - Fairview OK, US
Brian Randall - Fairview OK, US
Dennis M. Lettkeman - Watonga OK, US

International Classification:

C04B 28/00
C04B 16/00
C04B 20/00
C04B 16/08
C04B 28/14
C08K 3/30

US Classification:

106638000, 106660000, 106672000, 106677000, 106772000, 106778000, 106781000, 524005000, 524423000

Abstract:

A gypsum slurry includes water, a hydraulic component including stucco and a polycarboxylate dispersant. The dispersant has two repeating units wherein the first repeating unit is an olefinic unsaturated mono-carboxylic acid repeating unit or an ester or salt, and the second repeating unit is a vinyl or allyl group bound to a polyether by an ether linkage. The slurry can be made into a gypsum panel.

US Patent:

20060280898, Dec 14, 2006

Filed:

Jun 14, 2005

Appl. No.:

11/152317

Inventors:

Dennis Lettkeman - Watonga OK, US
Michael Shake - Johnsburg IL, US
Qingxia Liu - Vernon Hills IL, US
John Wilson - Fairview OK, US
Brian Randall - Fairview OK, US
David Blackburn - Barrington IL, US

International Classification:

C04B 28/14
C04B 11/00
B32B 1/04

US Classification:

428070000, 106778000, 106772000, 106781000, 106785000, 106783000, 106788000

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.