United States Gypsum Company

Other

University of Utah Research Foundation

Qiang Yu

Weixin David Song

Alfred C Li

Frederick Thomas Jones

Srinivas Veeramasuneni

Qingxia Liu

Steven W Sucech

Brent E Groza

Raymond John Mlinac

Paul J Henkels

Wenqi Luan

Xuming Wang

Paul W Reed

Michael R Lynn

Jan D Miller

Michael Patrick Shake

Kumar C Natesaiyer

Ye Yi

W David Song

Alfred Li

Richard B Stevens

Mark H Englert

Cesar Chan

William A Frank

Guy Rosenthal

Martin W Brown

David Paul Miller

Paul Reed

Jeffrey F Grussing

Bangji Cao

Michael L Cloud

Kevin W Moyer, Jr

Richard Spencer

Frederick M Boehnert

Qingxin Liu

Ron Schenck

Salvatore Digennaro

Stephen Folson

Kevin Henry

Tim Guined

Qiangxia Liu

Kevin W Moyer

Veeramasuneni Sirnivas

Sharon L Tracy

R Lynn Michael

Michael Lee Cloud

David Song Weixin

Raymond J Mlinac

This invention provides gypsum wallboards with a unique microstructure where the walls between voids are enhanced in thickness and strength to substantially improve the strength and handling properties of the wallboards. A method of making lightweight gypsum wallboards is also provided.

Light weight gypsum board

A reduced weight, reduced density gypsum panel that includes high expansion vermiculite with fire resistance capabilities that are at least comparable to (if not better than) commercial fire rated gypsum panels with a much greater gypsum content, weight and density.

Lightweight, reduced density fire rated gypsum panels

This invention provides low dust low density gypsum wallboard products having high total core void volumes, corresponding to low densities in the range of about 10 to 30 pcf. The wallboards have a set gypsum core formed between two substantially parallel cover sheets, the set gypsum core preferably having a total void volume from about 80% to about 92%, and made from a slurry including stucco, pregelatinized starch, and a naphthalenesulfonate dispersant. The combination of the pregelatinized starch and the naphthalenesulfonate dispersant also provides a glue-like effect in binding the set gypsum crystals together. The wallboard formulation, along with small air bubble voids (and water voids) provides dust control during cutting, sawing, routing, snapping, nailing or screwing down, or drilling of the gypsum-containing products. This invention also provides a method of making the low dust low density gypsum products including the introduction of soap foam in an amount sufficient to form a total void volume, including air voids, preferably from about 80% to about 92% in the set gypsum core, corresponding to a set gypsum core density from about 10 pcf to about 30 pcf. The wallboards produced by the method generate significantly less dust during working.

Disclosed herein are gypsum products with at least one high efficiency heat sink additive. The gypsum products, e.g., gypsum panels, are less susceptible to the damaging effects of extreme heat as the temperature rises due to the presence of the at least one additive.

Gypsum products with high efficiency heat sink additives

This invention provides low density gypsum products. This invention also provides a method of making the low density gypsum products.

A method of preparing a reduced weight, reduced density gypsum panel that includes high expansion vermiculite with fire resistance that meet or exceed one or more industry standard fire tests.

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

Method of making lightweight, reduced density fire rated gypsum panels

Growing community of inventors

Grayslake, IL, United States of America

Qiang Yu