Polyurethane/urea heat-cured and moisture-cured elastomers...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/12 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2258617

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.

L'invention concerne des élastomères dotés de propriétés physiques accrues, notamment la dureté et le rebond, pouvant être préparés par extension de la chaîne diamine ou durcissement à l'humidité d'une faible teneur du groupe isocyanate, de prépolymères de toluène diisocyanate préparés à partir d'un composant de polyol comprenant un poids moléculaire élevé, un diol de polyoxypropylène à faible insaturation, et un diol de poids moléculaire peu élevé. Les élastomères peuvent servir dans des utilisations telles que des rouleaux et dans d'autres utilisations où la dureté et le rebond sont importants.

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