Method for forming a lightweight cementitious structural product

Details Method for forming a lightweight cementitious structural product Method for forming a lightweight cementitious structural product

1983-07-15

1985-05-21

Dawson, Robert A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

106 88, 106111, 156 43, 156 41, 428703, B32B 518

Patent

active

045186529

ABSTRACT:
A method for producing a lightweight set cementitious product, and more specifically, gypsum wallboard, having excellent strength and paper-to-core bond, which method comprises producing a foam comprising polyvinyl alcohol and water, introducing the foam thus formed into an aqueous cementitious slurry, depositing the slurry between paper cover sheets, and permitting the cementitious slurry to set. In a further embodiment an emulsion formed of asphalt and wax is added to the cementitious slurry to impart water resistance, the polyvinyl alcohol of the foaming agent cooperating with the asphalt and wax emulsion to improve the water resistant properties of the set gypsum wallboard.

REFERENCES:
patent: 2862829 (1958-12-01), Dixon et al.
patent: 3963507 (1976-06-01), Kuramoto et al.
patent: 4094694 (1978-06-01), Long

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