Carbon black-filled foam
AssigneeThe Celotex Corporation
InventorsDavid G. Gluck, Thomas G. Soukup, William J. Moore
Life of this patent
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Abstract
A closed cell, rigid, polymer foam containing as filler at least about 2 percent by weight of carbon black, based on the weight of the polymer in the foam, the carbon black being uniformly dispersed throughout the foam so that there is present in the cell walls of the foam an amount of carbon black which reduces the aged k-factor of the foam to below the aged k-factor of the corresponding unfilled foam.
Claims26
A closed cell, rigid, polymer foam prepared from a polymer foam-forming composition containing a foaming agent, the foam containing as filler at lest about 2 percent by weight of carbon black, based on the weight of the polymer in the foam, the carbon black being uniformly dispersed throughout the foam so that there is present in the cell walls of the foam an amount of carbon black which reduces the aged k-factor of the foam to below the aged k-factor of the corresponding unfilled foam having the same density and prepared from the same foam-forming composition as the filled foam except that the carbon black is omitted and the amount of foaming agent is decreased to equalize the densities of the filled and unfilled foams.
A process for producing a carbon black-filled, closed cell, rigid, polymer foam which comprises (a) providing a dispersion of carbon black in a polymer foam-forming composition containing a foaming agent, and (b) thereafter foaming and curing the resultant filled foam-forming composition, the carbon black being added to and uniformly dispersed in the foam-forming composition in an amount which is at least about 2 percent by weight, based on the weight of the polymer in the foam, and which reduces the aged k-factor of the foam to below the aged k-factor of the corresponding unfilled foam having the same density and prepared from the same foam-forming composition as the filled foam except that the carbon black is omitted and the amount of foaming agent is decreased to equalize the densities of the filled and unfilled foams.
Dependencies are inferred from the claim text.