Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold...
Patent
1996-12-20
1998-10-06
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
264 87, 264236, 264347, 1621644, 162187, B28B 126
Patent
active
058172629
ABSTRACT:
A process is described for making a gypsum board having improved water resistance. The resulting gypsum board products are also described. The process comprises adding an aqueous siloxane emulsion to an aqueous slurry of a calcium sulfate material and host particles, where the siloxane emulsion is stable under the condition in which the slurry is maintained. The process further includes passing said siloxane containing slurry onto a flat porous forming surface to form a filter cake; removing a substantial portion of the water from the filter cake through the porous surface; pressing the filter cake to form a board and remove additional water; and drying the board to remove the remaining free water and to cause the core of the board to reach a temperature sufficient to cure the siloxane.
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The Condensed Chemical Dictionary, 1961, Reinhod Pub. Corp., New York, 6th Edition, pp. 1019 & 1021.
The Condensed Chemical Dictionary, 1961, Reinhodd Pub. Corp., New York, 6th Edition, pp. 1019 & 1021.
Derrington James
Egan Donald E.
Janci David F.
Lorenzen John M.
United States Gypsum Company
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