Lightfast polyurethane composition

A method for preparing an optical lens comprising utilizing a composition, comprising

• A) 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate
• and
• more than 50 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),
• B) at least one isocyanate-reactive component, selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof,
• and optionally
• C) one or more auxiliaries and/or additives.

A composition comprising

• A) 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate
• and
• more than 50 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, relating to the mass, the amount of the monomeric isophorone diisocyanate is greater than the amount of the oligomeric polyisocyanate based on isophorone diisocyanate,
• wherein the %-data relate to the sum of components a-1) and a-2),
• B) at least one isocyanate-reactive component, selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof,
• and optionally
• C) one or more auxiliaries and/or additives.

A kit-of-parts comprising the components A) and B) in separated spatial arrangement:

• A) 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate,
• and
• more than 50 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, relating to the mass, the amount of the monomeric isophorone diisocyanate is greater than the amount of the oligomeric polyisocyanate based on isophorone diisocyanate,
• wherein the %-data relate to the sum of components a-1) and a-2),
• B) at least one isocyanate-reactive component, selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof.