Patent ID: 6207725
Filing Date: 2001-03-27
Classification: C08G

Abstract:
Process for making rigid polyurethane or urethane-modified polyisocyanurate foams comprising:reacting an organic polyisocyanate composition with an isocyanate reactive composition in the presence ofa blowing agent;0.05-5 wt %, relative to the weight of the isocyanate reactive composition, of a first tertiary amine catalyst; and0.01-5 wt %, relative to the weight of the isocyanate reactive composition, of a second tertiary amine catalyst;wherein said first catalyst is selected from the group consisting of 2,2'-dimorpholinodiethylether, 1-methylimidazole, and 4-dimethylaminopyridine,wherein said second catalyst has a pK.sub.a above 12,andwherein said isocyanate reactive composition comprises, relative to the total weight of isocyanate-reactive compounds, at least 10 wt % of polyester polyol.