Patent ID: 9733394
Date: 2017-08-15
CPC Classifications: C08G,C08L,G02B

Claim:
1. A method for preparing an optical lens comprising providing a composition including component A) which comprises 10 to 30 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate, and 70 to 90 wt.-% of at least one polyisocyanate a-2) based on isophorone diisocyanate containing monomeric isophorone diisocyanate and at least one oligomeric polyisocyanate based on isophorone diisocyanate, wherein the %-data relate to the sum of components a-1) and a-2), at least one isocyanate-reactive component, selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof, and one or more auxiliaries and/or additives, wherein the amount of isocyanate groups of component A) is in the range of 25 to 34 wt.-%, based on the total weight of component A).