High resilience flexible foamed polyurethanes, foamable mixtures and process therefor.

摘要

A flexible, highly resilient, cold-cure, closed-mold polyurethane foam can be produced by reacting a foamable mixture comprising an organic isocyanate, water and a polyol. The foams of the invention are preferably prepared from a mixture of a hydroxyl-terminated graft copolymer and a hydroxyl-terminated polyoxyalkylene polyether in the presence of a co-catalyst mixture of at least one tertiary amine catalyst and at least one metal-containing basic catalyst. Said catalyst is selected from the group consisting of an alkali metal hydroxide, an alkaline earth metal hydroxide, an inorganic basic salt thereof derived from the reaction of said hydroxides with a weak inorganic acid, a metal organic basic salt catalyst derived from the reaction of at least one of said hydroxides with an organic acid and mixtures thereof. Useful metal organic catalysts are selected from the group consisting of the alkali and alkaline earth metal carboxylates, alkoxides and phenates. Useful inorganic basic metal salt catalysts are sodium bicarbonate and sodium carbonate.