POLYURETHANE/UREA HEAT-CURED AND MOISTURE-CURED ELASTOMERS WITH IMPROVED PHYSICAL PROPERTIES

摘要

Elastomers with improved physical properties, particularly hardness and rebound, may be prepared by the diamine chain extension or moisture cure of low isocynate group content, toluene diisocyanate-based prepolymers prepared from a polyol component comprising a high molecular weight, low unsaturation polyoxypropylene diol and a low molecular weight diol. The elastomers are useful for applications such as rollers and other applications where hardness and rebound are important.