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US 5,006,569 AGranted
Density reduction in flexible polyurethane foams
AssigneePMC, Inc.
InventorHerman Stone
Life of this patent
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AssigneePMC, Inc.
InventorHerman Stone
Estimating the term…
Improved, flexible, open-celled polyurethane foams of reduced density, but with stability and firmness characteristics comparable to those of standard foams, are described. The foams are formed in situ from the reaction, in the presence of a catalyst, of an isocyanate, one or more blowing agents including water, a foam stabilizer, a polyether polyol, and a liquid salt produced from the reaction of CO.sub.2 with a water-soluble amine or amino alcohol. Preferred amines or amino alcohols for the CO.sub.2 salt include primary amines and polyols which contain primary amino end groups, secondary amines which contain primary hydroxyl groups, and a variety of low molecular weight aminohydroxy compounds. The liquid salt is present in the foam formulations in an amount of at least 2 parts by weight per 100 parts by weight of polyol.
An improved flexible, open-celled polyurethane foam produced in situ from the reaction, in the presence of a catalyst, of an isocyanate, a blowing agent, a foam stabilizer, a polyether polyol having a molecular weight from about 2000 to about 6500, and a liquid salt produced from the reaction of CO.sub.2 with a water-soluble amine or amino alcohol, wherein the liquid salt is present in an amount greater than or equal to about 2 parts by weight per 100 parts by weight of polyol, the foam being characterized by reduced density as compared with a second foam of the same composition that was produced from a reaction mixture wherein the liquid salt was present in an amount less than about 2 parts by weight per 100 parts by weight of polyol.
The foam of claim 5 wherein the secondary amine is diethanolamine.
In the method for the continuous manufacture of flexible, open-celled polyurethane foam from the reaction, in the presence of a catalyst, of a formulation comprising an isocyanate, a blowing agent, a foam stabilizer, and a polyether polyol having a molecular weight from about 2000 to about 6500, the improvement which comprises:
Dependencies are inferred from the claim text.