United States Gypsum Company

Aluminum Company of America

Usg Corporation

Usg Interiors, Inc.

Steven W Sucech

Raymond John Mlinac

Qiang Yu

Frederick Thomas Jones

Brent E Groza

Paul J Henkels

Chanakya Misra

Mark H Englert

Richard B Stevens

Michael J Porter

Bruce Lynn Petersen

Russell A Dombeck

Therese A Fults

Srinivas Veeramasuneni

William A Frank

Alan Pearson

Xuming Wang

John E Marhanka

Stewart E Hinshaw

Frederick M Boehnert

John J Polyner

Kip R Buster

Bradley S Nemeth

Raymond J Mlinac

Ray C Privett

Stephen Schettler

Compositions and methods for reducing the impact of hard water on gypsum board foaming are provided. The compositions include adding a foam to water and a calcined slurry. The foam includes water, dispersed air and a surfactant. Surfactants for use include a hydrophobic portion having an alkyl chain length distribution of about 20% to about 60% C8 chains; about 20% to about 60% C10 chains; about 14% to about 36% C12 chains and about 2% to about 20% C14 chains and also having a hydrophilic portion having about 0.2 to 3.0 ethoxy groups.

Hard water foaming agents and methods for gypsum board production

The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.

Gypsum-containing product

Gypsum-containing product and gypsum board

Gypsum-containing product and method for producing same

An acoustical panel comprising a continuous phase of an interlocking set gypsum matrix and a method of preparing an acoustical panel are disclosed.

Acoustical panel comprising interlocking matrix of set gypsum and method for making same

Gypsum-containing board and tile, and method for producing same

The invention provides a board forming system comprising a forming table comprising a belt with a surface for conveying a backing layer; a mixer fitted with a mechanism capable of depositing cementitious slurry material over a top surface of the backing layer; and a slurry spreader positioned downstream of the mixer, wherein a portion of the slurry spreader comprises a plurality of apertures which are connected to a source of pressurized fluid. The slurry spreader is configured such that the pressurized fluid flows out of the slurry spreader through the apertures so as to provide a continuous film of fluid across an outer surface of the slurry spreader. The slurry spreader is positioned such that it can contact at least a portion of the cementitious slurry after the slurry exits the discharge and before the slurry is spread across the width of the backing layer such that the thickness of the slurry is approximately equal to the desired slurry thickness for board formation. The invention further provides methods for forming cementitious board comprising the use of the slurry spreader.

Slurry spreader for cementitious board production

A method for producing a set gypsum-containing product comprising an interlocking matrix of set gypsum wherein said method comprises applying to said set gypsum one or more enhancing materials selected from the group consisting of phosphoric acid; condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units, and monobasic salts or monovalent ions of orthophosphates.

Gypsum-containing board and tile, and method for producing gypsum-containing board and tile

Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it

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Lake Villa, IL, United States of America

Steven W Sucech