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.
Claims8
A polyoxyalkylene polyol composition comprising two or more polyoxyalkylene polyols having a nominal functionality of two or more, said polyoxyalkylene polyol composition having an unsaturation of 0.010 meq/g or less, an equivalent weight of from about 500 Da to about 10,000 Da, and a polydispersity of about 1.4 or greater, wherein at least one of said two or more polyoxyalkylene polyols is a polyoxypropylene polyol having an unsaturation of 0.010 meq/g or less.
A multidisperse polyol blend comprising two or more individual polyoxypropylene polyether diols of different average molecular weight, each of said individual polyoxypropylene diols having an unsaturation of less than 0.010 meq/g and a polydispersity of less than 1.20, said blend having a polydispersity of about 1.4 or greater and an average equivalent weight between 500 Da and 10,000 Da.
A monomodal polyoxypropylene polyol having an unsaturation of less than 0.010 meq/g and having a polydispersity greater than 2.0.
Dependencies are inferred from the claim text.