Rigid polyurethane modified polyisocyanurate containing fly ash as an inorganic filler
AssigneeThe Dow Chemical Company
InventorWilliam G. Stobby
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Abstract
This invention is a closed cell, rigid polyurethane-modified polyisocyanurate foam containing from about 10 to about 80 percent by weight of the foam of fly ash, which polyurethane-modified polyisocyanurate foam is prepared from a polyurethane-modified polyisocyanurate foam-forming composition which, when foamed to a density of about 1.75 pounds per cubic foot in the absence of the fly ash, forms a foam having a compressive modulus of about 150 to 325 pounds per square inch.
Claims8
A closed cell, rigid, polyurethane-modified polyisocyanurate foam containing from about 10 to about 80 percent by weight of the foam of fly ash, which polyurethane-modified polyisocyanurate foam is prepared from a polyurethane-modified polyisocyanurate foam-forming composition which when foamed to a density of about 1.75 pounds per cubic foot in the absence of the fly ash, forms a foam having a compressive modulus of about 150 to 325 pounds per square inch.
Dependencies are inferred from the claim text.