C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/16 (2006.01) B01J 31/04 (2006.01) B32B 5/18 (2006.01) C08G 18/18 (2006.01) C08G 18/22 (2006.01) C08G 18/42 (2006.01) C08J 9/14 (2006.01)
Patent
CA 2144490
Rigid, closed cell polyisocyanurate foams are prepared by reacting together a polyisocyanate and a polyester polyol or a mixture of a polyester polyol and at least one other isocyanate-reactive compound in the presence of (a) a hydrogen-containing blowing agent or a mixture of a hydrogen-containing blowing agent and at least one co- blowing agent and (b) a catalyst mixture comprising (i) a carboxylate salt of an alkali metal or an alkaline earth metal or mixtures thereof, (ii) a quaternary ammonium carboxylate salt, and (iii) optionally a tertiary amine, wherein the mole ratio of carboxylate metal salt: tertiary amine is a value greater than about 2:1, and the total moles of quaternary ammonium carboxylate salt are less than the combined moles of the carboxylate metal salt and the tertiary amine.
Skowronski Michael J.
Trout Kenneth G.
Gowling Lafleur Henderson Llp
The Dow Chemical Company
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