Polyurethane elastomers having improved green strength and demold time, and polyoxyalkylene polyols suitable for their preparation
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United States of America Patent
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Oct 12, 1999
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N/A
app pub date -
Aug 31, 1998
filing date -
Jun 15, 1995
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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.
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