C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/18 (2006.01) B32B 5/18 (2006.01) C08G 18/42 (2006.01) C08G 18/81 (2006.01) C08J 9/14 (2006.01)
Patent
CA 2108849
ABSTRACT 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 tertiary amine, and (iii) a quaternary ammonium carboxylate salt, wherein the equivalent ratio of carboxylate metal salt: tertiary amine is a value less than about 2:1, and the quaternary ammonium carboxylate salt is present in an amount which enhances the char structure of polyisocyanurate foams made with the catalyst mixture and subjected to flammability char tests.
Londrigan Michael E.
Trout Kenneth G.
Celotex Corporation (the)
Gowling Lafleur Henderson Llp
LandOfFree
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