POLYURETHANE RIGID FOAMS
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United States of America Patent
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Issued Date -
Jan 22, 2015
app pub date -
Aug 24, 2012
filing date -
Sep 2, 2011
priority date (Note) -
Abandoned
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Abstract
The present invention relates to polyurethane rigid foams formulations. More particularly, the present invention relates to polyurethane rigid foams formulations, prepared from aromatic polyester polyols, which show improved compressive strength. The formulations include an isocyanate reacting mixture, at least one polymeric diphenylmethane diisocyanate, having a functionality of at least 2.7, and at least one blowing agent; such that the stoichiometric index of the polyisocyanate to the isocyanate reacting mixture is 1.0-1.8.
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