Method of manufacturing a sag-resistant bonded particulate article
AssigneeAmerican Cyanamid Company
InventorsGerald J. Guerro, Gregory G. Borsinger
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Abstract
A method for the production of improved bonded particulate articles, and the articles so produced, are disclosed. Specifically, the manufacture of particulate articles having a reduced tendency to undergo humidity-induced sag is disclosed. These articles have utility in such application as ceiling tiles.
Claims20
A method of preventing or minimizing humidity-induced sag in bonded particulate substrates comprising applying to at least one side of said particulate substrate a coating composition comprising an aqueous dispersion of a mixture of an effective amount of a glyoxal resin or derivative thereof and an effective amount of a starch compound, and an effective amount of a filler material, and curing said coating composition.
A method of preventing or minimizing humidity-induced sag in bonded particulate substrates a coating composition comprising an aqueous dispersion of an effective amount of mixture of a resin selected from the group of dimethylol dihydroxy ethylene urea, tetramethylol glycoluril and mixtures thereof, an effective amount of a starch and an effective amount a filler selected from the group consisting of kaolin, bentenite, clays, alkali metal carbonates and mixtures thereof, said dimethylol dihydroxy ethylene urea and starch being present in about a 1:1 weight % ratio and said composition being applied in quantities sufficient to result, upon curing, in a layer upon said substrate having a weight of about 5 to about 40 grams/ft.sup.2 of substrate, and curing said composition at a temperature of between about 250.degree. F. to about 375.degree. F. for a time sufficient to result in curing of said composition.
Dependencies are inferred from the claim text.