Polyurethane elastomers having improved green strength and demol

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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36 25R, 36 28, 36 32R, 521130, 521174, 521176, 528 65, 528 76, 528 77, C08J 908, C08G 1848, C08G 1810, A43B 1304

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active

057287457

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 bythe 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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