Polyurethane elastomers having improved green strength and demold time, and polyoxyalkylene polyols suitable for their preparation
AssigneeArco Chemical Technology, L.P.
InventorsGary L. Allen, Nigel Barksby, Stephen D. Seneker, Usama E. Younes
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Abstract
Elastomers exhibiting decreased demold times and improved green strength are prepared by reacting a di- or polyisocyanate with a monodisperse polyoxypropylene diol having ultra-low unsaturation, and preferably prepared by the double metal cyanide.t-butyl alcohol catalyzed polymerization of propylene oxide. Further improved demold times and elevated elastomer physical properties are made possible by the use of multidisperse polyoxyalkylene polyether polyol blends having an overall unsaturation of less than 0.010 meq/g and a polydispersity of about 1.4 or greater.
Claims13
An isocyanate-terminated prepolymer prepared by reacting an excess of a di- or polyisocyanate with a polyoxyalkylene polyol component having an average equivalent weight of from about 1000 Da to about 8000 Da, a polydispersity of 1.4 or greater, and an unsaturation of less than 0.010 meq/g, wherein said polyoxyalkylene polyol component comprises a polyoxypropylene polyol.
Dependencies are inferred from the claim text.