Brian K Randall

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:

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:

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:

20060280899, Dec 14, 2006

Filed:

Jun 14, 2005

Appl. No.:

11/152323

Inventors:

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

International Classification:

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

US Classification:

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

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.