Gypsum wood fiber product having improved water resistance

Details Gypsum wood fiber product having improved water resistance Gypsum wood fiber product having improved water resistance

1996-12-20

2000-01-04

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162172, 1621813, 162183, 106660, 106778, 106780, 264 82, B32B 1302

Patent

active

060105968

ABSTRACT:
An improved water resistant gypsum board is made by adding an aqueous wax emulsion containing a cationic surfactant to an aqueous slurry containing calcium sulfate and host particles at a slurry temperature which maintains calcium sulfate hemihydrate crystals. The wax emulsion is stable at the temperature of slurry which maintains the calcium sulfate hemihydrate. The slurry is then dewatered and rehydrated to form a gypsum board and dried at a temperature to melt the wax.

REFERENCES:
patent: 2526537 (1950-10-01), Camp
patent: 3822340 (1974-07-01), Eberl et al.
patent: 4239716 (1980-12-01), Ishida et al.
patent: 4741773 (1988-05-01), Kuroda et al.
patent: 4840688 (1989-06-01), Vogt
patent: 5120355 (1992-06-01), Imai
patent: 5320677 (1994-06-01), Baig
patent: 5437722 (1995-08-01), Borenstein

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