B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
403/11, 154/69
B32B 13/02 (2006.01) C04B 16/08 (2006.01) C04B 28/14 (2006.01)
Patent
CA 1288193
ABSTRACT OF THE DISCLOSURE A method for producing a lightweight set cementitious product having excellent strength by forming a aqueous cementitious slurry, incorporating therein expandable polystyrene beads which are less than completely expanded, and heating the slurry to drive off excess water, to cause a cementitious mixture to set, and to further and completely expand the polystyrene beads. In a preferred embodiment an aqueous slurry of calcium sulfate hemihydrate is produced including expandable polystyrene beads in a state which they are partially but not fully pre-expanded. The slurry is deposited between two paper cover sheets, and the product is heated to drive off excess water, to set the gypsum to the solid dihydrate state, and to complete the expansion of the polystyrene beads until they reach their fully expanded state, thereby resulting in a strong lightweight gypsum wallboard which has excellent adhesion between the expaned polystyrene beads and the set gypsum.
552367
Company United States Gypsum
Macrae & Co.
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