A two-component polyurethane flexible foam system having improved elongation, tensile strength and tear resistance

摘要

The present invention is directed to flexible polyurethane foam formulations and the foams prepared using these formulations. The formulations are two components, comprising:A) a diisocyanate mixture of modified diisocyanates or mixtures of modified and unmodified diisocyanates; and,B) a resin containing, based on the total weight of the resin,1) from 60 percent to about 85 percent by weight conventional polyols,2) from 12 percent to about 30 percent by weight of a graft polymer dispersion,3) optionally up to about 1 percent by weight of a surfactant,4) from 0.3 percent to about 2.0 percent by weight water,5) from 0.2 percent to about 1.2 percent by weight of a catalyst capable of promoting urethane formation,6) optionally a chain extender, and7) optional additives such as pigments and fillers. The foams prepared from the foregoing formulation exhibit enhanced tensile elongation, tensile strength, and tear strength.