Polyureas preparable from two polyetheramines and a prepolymer

A polyurea, obtained by a process comprising reacting

• a) a component A comprising
• a1) 5 to 40% by weight of at least one first polyetheramine (PEA 1), obtained by a process comprising reacting at least one first polyetherpolyol (PEP 1) and at least one first amine, wherein the PEP 1 has an equivalent weight of ≦500, and the PEA 1 has a nominal functionality of 2,
• a2) 30 to 90% by weight of at least one second polyetheramine (PEA 2), obtained by a process comprising reacting at least one second polyetherpolyol (PEP 2) and at least one second amine, wherein the PEP 2 has an equivalent weight of >500, and the PEA 2 has a nominal functionality of 2, and
• a3) 5 to 30% by weight of at least one amine chain extender
• and
• b) a component B, obtained by a process comprising reacting
• b1) at least one third polyetherpolyol (PEP 3) and
• b2) at least one isocyanate
• wherein the component B is a prepolymer.