Two-component polyurethane compositions, in particular suitable for use as tough structural adhesives or as potting compounds

A two-component polyurethane composition consisting of a polyol component K1, a polyisocyanate component K2, and one or more member selected from the group consisting of fillers and drying agents;

• wherein
• the polyol component K1 is
• at least one reaction product of ricinus oil with ketone resins with an OH number of 110 to 200 mg KOH/g A1, and
• at least one aliphatic triol A2;
• the polyisocyanate component K2 is at least one aromatic polyisocyanate B1;
• the weight percent ratio (A1/A2) is 20-50;
• the ratio of all the NCO groups of the aromatic polyisocyanates B1 to all the OH groups in the sum of (A1+A2) =1.15:1-0.85:1;
• the aliphatic triol A2 is
• 1,2,3-propanetriol and/or
• 1,1,1-trimethylolpropane and/or
• polyether polyols based on 1,1,1-trimethylolpropane with a molecular weight of 170-500 g/mol and an OH number of 400-1100 mg KOH/g;
• and
• the total of all the OH groups of (A1+A2) is ≧99.5% of the total of all the OH groups of the two-component polyurethane composition.