Patent ID: 6100311
Filing Date: 2000-08-08
Classification: C08G

Abstract:
Process for the preparation of polyurethane foams comprising reacting a reaction system comprising a polyisocyanate and an isocyanate-reactive compound in the presence of a catalyst mixture comprising a tin salt of a carboxylic acid having 2-18 carbon atoms (catalyst 1) and a lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium or barium salt of a protic acid, the acid having at least 2 acidic hydrogen atoms, having a pK.sub.a in water of 2-10 and wherein 10-90% of the acidic hydrogen atoms therein have been replaced by the metal ion (catalyst 2) wherein the ratio of catalyst 1: catalyst 2 is from about 50:50 to about 90:10 and the amount of each of catalyst 1 and catalyst 2 is 0.1-5% by weight (based on the total weight of the reaction system) with the proviso that toluene diisocyanate is not the sole polyisocyanate reactant.