Viscosity-stable isocyanate-terminated prepolymers and polyoxyalkylene polyether polyols having improved storage stability
First Claim
1. An isocyanate-terminated, viscosity stable prepolymer prepared by reacting an excess of an organic di- or polyisocyanate with a polyol component comprising one or more polyoxyalkylene polyether polyols having a nominal functionality of two or more, at least one of said one or more polyoxyalkylene polyether polyols prepared by the oxyalkylation of a suitably functional initiator molecule in the presence of a double metal cyanide complex catalyst and containing double metal cyanide complex catalyst or double metal cyanide complex catalyst residues and containing a stabilizing effective amount of one or more antioxidants;
- wherein said prepolymer contains from about 10 to about 250 ppm double metal cyanide complex catalyst or double metal cyanide complex catalyst residues.
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Abstract
Polyoxyalkylene polyols containing double metal cyanide complexes or residues thereof as are produced during the preparation of polyoxyalkylene polyols by the double metal cyanide complex catalyzed oxyalkylation of a suitably functional hydric initiator are stable without catalyst removal. Isocyanate-terminated prepolymers prepared from such polyols are surprisingly viscosity-stable relative to similar prepolymers prepared from polyols not containing double metal cyanide complexes or residues thereof.
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13 Claims
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1. An isocyanate-terminated, viscosity stable prepolymer prepared by reacting an excess of an organic di- or polyisocyanate with a polyol component comprising one or more polyoxyalkylene polyether polyols having a nominal functionality of two or more, at least one of said one or more polyoxyalkylene polyether polyols prepared by the oxyalkylation of a suitably functional initiator molecule in the presence of a double metal cyanide complex catalyst and containing double metal cyanide complex catalyst or double metal cyanide complex catalyst residues and containing a stabilizing effective amount of one or more antioxidants;
wherein said prepolymer contains from about 10 to about 250 ppm double metal cyanide complex catalyst or double metal cyanide complex catalyst residues. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
Specification