C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/111, 261/77
C04B 16/02 (2006.01) B28B 3/02 (2006.01) B32B 3/06 (2006.01) B32B 21/02 (2006.01) B32B 21/10 (2006.01) C04B 11/024 (2006.01) C04B 14/38 (2006.01) C04B 24/12 (2006.01) C04B 24/28 (2006.01) C04B 28/14 (2006.01) D21J 1/00 (2006.01) E04C 2/26 (2006.01)
Patent
CA 2329629
A process for making an improved gypsum/wood fiber board is described. Products resulting from the process are also described. The process comprises adding a diisocyanate, specifically methylenediphenyldiisocyanate (MDI) to an aqueous slurry of calcium sulfate material and cellulosic fibers, where the MDI is added as an emulsion stable in the conditions in which the slurry is maintained. The process further includes passing the MDI 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.
Company United States Gypsum
Macrae & Co.
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