United States Gypsum Company

Trevor S Rische

Qinghua Li

Mark K Hemphill

Jeffrey F Grussing

Suman Sinha Ray

Naser Aldabaibeh

Samar Emami

Disclosed are an organic binder-based coating; a composite gypsum board containing face and back cover sheets, an outside surface of the back cover sheet bearing the coating; and a method of preparing composite board where the back cover sheet contains the coating on its outer surface. The coating is formed from a composition comprising an alkaline silicate, a solid filler, and optionally, a borate. An enhancing layer can also be applied to the back cover sheet.

Gypsum wallboard with enhanced fire resistance, and related coatings and methods

Methods of treating lime bucking in a plaster slurry are described. The method involves providing a slurry exhibiting lime bucking having a cone penetration of less than 10 mm at a consistency of 60 cc, comprising: water; calcium sulfate hemihydrate; and hydrated lime; and mixing an effective amount of a dispersant comprising a low intensity dispersant into the slurry so that the cone penetration increases and wherein the cone penetration is 10 mm or more at 10 minutes after addition of the dispersant at a consistency of 60 cc; and applying the plaster slurry containing the dispersant to a substrate. Veneer plaster dry component mixtures having reduced lime bucking when made into a slurry containing a low intensity dispersant, or hydrated lime coated with wax or a dibenzoate plasticizer are also described.

Compositions and methods for reducing lime bucking in plaster products

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Trevor, WI, United States of America

Trevor S Rische