2K polyurethane systems with a high glass-transition temperature

A two-component polyurethane composition consisting of a polyol component and a polyisocyanate component, containing

• 10 to 80 wt. % based on weight of the composition of the polyol component comprising at least one polyol with a number-average molecular weight of 200 g/mol to 3000 g/mol,
• 5 to 70 wt. % based on weight of the composition of the polyisocyanate component comprising at least one polyisocyanate, wherein 3 to 25 mol % of the NCO groups of the polyisocyanate are converted into carbodiimides and/or uretonimine,
• 0 to 10 wt. % based on weight of the composition of additives, the additives being present in the polyol component, the polyisocyanate component or both the polyol component and the polyisocyanate component,
• wherein the composition is free of polyester polyols and a mixture of the polyol component and the polyisocyanate component has an NCO:OH ratio of 2:1 to 1:2, a viscosity of 20 mPa·s to 3000 mPa·s (EN ISO 2555, 25° C.) immediately after mixing, and crosslinked products of the mixture have a glass transition temperature Tg above 60° C.