Two-component polyurethane composition comprises a polyol component comprising at least one reaction product of castor oil and ketone resins with an hydroxy number of 110-200 mg potassium hydroxide/g, and at least one aliphatic triol; and a polyisocyanate component comprising at least one aromatic polyisocyanate. The ratio of all isocyanate groups of the aromatic polyisocyanates to all the hydroxy groups of ketone resins and aliphatic triol is 1.15:1-85:1. The aliphatic triol is 1,2,3-propane triol, 1,1,1-trimethylol propane and/or polyether polyols. Two-component polyurethane composition comprises: a polyol component comprising at least one reaction product of castor oil and ketone resins with an hydroxy number of 110-200 mg potassium hydroxide/g, and at least one aliphatic triol; and a polyisocyanate component comprising at least one aromatic polyisocyanate. The ratio of ketone resins and aliphatic triol is 4-50 wt.%. The ratio of all isocyanate groups of the aromatic polyisocyanates to all the hydroxy grou
