| abstract |
Energy-absorbing elastomers having a resilience of no more than 20.0% according to ASTM D2632-92 comprise the reaction product of an organic polyisocyanate and a resinous material comprising: i) an active-hydrogen-containing composition including between about 10.0 weight % and about 50.0 weight % of a C10 or higher hydrocarbon (e.g. castor oil) based on the total weight of the resinous material, a polyoxyalkylene polyol and a chain extender having a number average molecular weight of less than about 500; ii) a water scavenger; and iii) optionally, one or more compounds selected from the group consisting of cross-linkers, catalysts, antioxidants, UV-stabilizers, flame retardants, plasticizers, fillers, coloring agents and mixtures thereof. The energy-absorbing elastomers are hydrophobic in nature and have extended gel times, thus making them suitable for high volume applications such as coating a large substrate or filling a large void between two substrates. |