Energy absorbing polyurethane compositions

Abstract From the Canadian patent

Energy absorbing polyurethane elastomer compositions having a density of from 0.4 to 1 gm/cc, a compression set of less than 5% and a recovery time of from 10 to 600 milliseconds preferably, from 100 to 200 milliseconds are provided herein. Such compositions are formed by reaction of a urethane-forming component comprising a compound containing at least four urethane-forming reactive sites and capable of forming stable complexes through unsatisfied urethane-forming reactive sites an, elasticising polyol selected from the group consisting of diols and triols, and a diisocyanate in less than stoichiometric amounts. These compositions preferably contain a light-weight filler.