Patent ID: 7297396

Claim:
A gypsum board, comprising: a. a gypsum matrix formed from an aqueous alkaline gypsum slurry and having a bottom and a top, said gypsum matrix being operable to form gypsum crystals when said gypsum board is cured; b. a first facer sheet placed on said bottom of said gypsum matrix; c. a second facer sheet placed on said top of said gypsum matrix; d. one or more glass fibers placed within said gypsum matrix; e. said glass fibers having a tacky polymeric coating formed by roller coating or evaporation of acidulated aqueous polymer solution, or by precipitation from an aqueous alkaline gypsum slurry comprising a polymer composition, said tacky coating comprising an acidulated water-soluble copolymer comprised of methacrylic acid and dimethyldiallyammonium chloride; and f. said polymer composition materializing as a tacky coating evaporated or precipitated on said glass fibers, forming a compliant bond with said gypsum crystals during said curing of said gypsum board, said tacky coating providing increased strength, flexure resistance and nail pull out resistance to said gypsum board.