Catalyst Compositions and Methods for Making Foam

A method for preparing a polyisocyanurate/polyurethane foam which comprises contacting at least one polyisocyanate with a premix comprising at least one polyol, at least one blowing agent, and a catalytic amount of a catalyst composition comprising a solution of at least one member selected from the group of bismuth neodecanoate, bismuth octoate, bismuth versalate, bismuth napthenate, and bismuth pivalate;

• and at elast one member selected from the group consisting of potassium pivalate, tetramethylammonium pivalate, potassium octoate, potassium acetate, potassium acrylate 2-hydroxylpropyltrimethylammonium pivalate, 2-hydroxylpropyltriethylammonium pivalate, tetraethylammonium pivalate, tetrapropylammonium pivalate, tetrabutylammonium pivalate, potassium triethylacetate, tetramethylammonium triethylacetate, 2-hydroxylpropyltrimethylammonium triethylacetate, 2-hydroxylpropyltriethylammonium triethylacetate, tetraethylammonium triethylacetate, tetrapropylammonium triethylacetate, tetrabutylammonium triethylacetate, potassium neoheptanoate, tetramethylammonium neoheptanoate, 2-hydroxylpropyltrimethylammonium neoheptanoate, 2-hydroxylpropyltriethylammonium neoheptanoate, tetraethylammonium neoheptanoate, tetrapropylammonium neoheptanoate, tetrabutylammonium neoheptanoate, potassium neooctanoate, tetramethylammonium neooctanoate, 2-hydroxylpropyltrimethylammonium neooctanoate, 2-hydroxylpropyltriethylammonium neooctanoate, tetraethylammonium neooctanoate, tetrapropylammonium neooctanoate, and tetrabutylammonium neooctanoate.