| abstract |
The present invention relates to a composition comprising 10 to 50% by weight of at least one polyisocyanate a-1) based on hexamethylene diisocyanate, comprising at least one oligomeric polyisocyanate based on hexamethylene diisocyanate and optionally hexamethylene diisocyanate monomeric and 50 to 90% by weight of at least one polyisocyanate a-2) based on isophorone diisocyanate, comprising at least one oligomeric polyisocyanate based on isophorone diisocyanate and optionally monomeric isophorone diisocyanate, provided that at at least one of components a-1) and a-2) additionally comprises monomeric isocyanate of the so-called class, as well as at least one sulfur-containing component. It has been shown that the aforementioned mixture of the specific isocyanate group containing components improves the thermal and mechanical properties of a cured composition. Molded articles thus prepared are particularly suitable for the preparation of eyeglass lenses, among other things due to these properties. |