Rigid polyurethane foams
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United States of America Patent
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Mar 27, 2001
Issued Date -
N/A
app pub date -
Oct 17, 1997
filing date -
Nov 4, 1996
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Abstract
Process for making rigid polyurethane or urethane-modified polyisocyanurate foams comprising the step of reacting an organic polyisocyanate composition with an isocyanate-reactive composition comprising a polyester polyol in the presence of an amine catalyst characterized in that the pK.sub.a of the conjugated ammonium salt of said amine is less than 12.
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