Poly(oxypropylene/oxyethylene) random polyols useful in preparing flexible high resilience foam with reduced tendencies toward shrinkage and foam prepared therewith
AssigneeArco Chemical Technology, L.P.
InventorStanley L. Hager
Life of this patent
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Abstract
High resilience polyurethane foams exhibiting little or no shrinkage may be prepared from low unsaturation double metal cyanide catalyzed polyoxyalkylene polyols in amounts greater than 20 weight percent of the total polyol component, when low unsaturation poly(oxypropylene/oxyethylene) random polyols having less than 35 weight percent of an all polyoxypropylene block catalyzed by double metal cyanide catalysts and one or more external random polyoxypropylene/polyoxyethylene blocks each containing 2 weight percent or more oxyethylene moieties, and an unsaturation of less than 0.02 meq/g are employed.
Claims8
A polyol suitable for use in a high resilience foam formulation at levels of greater than about 20 percent of the weight of a polyol component used to prepare said foam while producing a foam with little or no shrinkage, said polyol comprising a polyoxyalkylene polyol prepared at least in part in the presence of a double metal cyanide complex oxyalkylation catalyst and having an unsaturation of less than 0.02 meq/g, wherein said polyoxyalkylene polyol contains less than 35 weight percent of an all polyoxypropylene internal block prepared in the presence of said double metal cyanide complex catalyst, and wherein said polyoxyalkylene polyol has one or more random poly(oxypropylene/oxyethylene) external block(s), each of said external blocks containing minimally 2 weight percent oxyethylene moieties based on the weight of the block(s).
Dependencies are inferred from the claim text.