Application of methylenediphenyldiisocyanate for producing...

Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold...

Reexamination Certificate

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Details

C264S087000, C162S164400, C162S187000

Reexamination Certificate

active

07056460

ABSTRACT:
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.

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patent: 4902348 (1990-02-01), Kossatz et al.
patent: 5320677 (1994-06-01), Baig
patent: 5609916 (1997-03-01), Fiori et al.
patent: 5609962 (1997-03-01), Ouhadi
patent: 5817262 (1998-10-01), Englert
patent: 5840428 (1998-11-01), Blizzard et al.
patent: 5840800 (1998-11-01), Joffre et al.
patent: 5849837 (1998-12-01), Wei et al.
patent: 3909083 (1990-06-01), None
patent: 0256330 (1988-02-01), None
patent: 03088927 (1989-03-01), None
Abstract and Document Bibliography for EP0308927.
Abstract and Document Bibliography for DE3909083.
Abstract and Document Bibliography for EP0256330, A3, B1.
European Search EP 00311005.

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