Dispersant for carbon black-filled foam
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United States of America Patent
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Mar 9, 1993
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app pub date -
Jul 31, 1992
filing date -
Aug 28, 1991
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Abstract
A closed cell, rigid, polymer foam comprising the reaction product of a polyisocyanate and an isocyanatereactive compound in the presence of (a) a foaming agent, (b) at least about 2 percent by weight of carbon black, based on the weight of the polymer in the foam, and (c) a capped polyoxyalkylene compound which helps bring about a uniform dispersion of the carbon black throughout the foam so that the aged k-factor of the foam is below the aged k-factor of the corresponding unfilled foam.
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