POLYURETHANE-UREA ELASTOMERS

摘要

The present invention is directed to polyurethane-urea materials and to a
process for their production. These polyurethane-ureas are preferably
optically clear and comprise the reaction product of a (cyclo)aliphatic
polyisocyanate or prepolymer thereof, with an isocyanate- reactive component
that comprises one or more aromatic diamines which contains two primary amine
groups, and one or more compounds containing two secondary amine groups which
may be linked to aliphatic and/or aromatic moieties. This isocyanate-reactive
component may additionally comprise one or more hydroxyl-functional compounds.
The present invention offers a relatively fast "Green-Cure Time" of solid
polyurethane-ureas which enables these to be demolded in a relatively short
time period, followed by subsequent post-curing outside the mold.