Patent ID: 8729210

Claim:
A prepolymer of the general formula (II): X—[—N(CHO)—CO—NH—R 1 —NCO] n (II) wherein X represents a linear or branched aliphatic, cycloaliphatic, heterocyclic and/or aromatic structural unit having 2 to 20 carbon atoms, which is free of polyether structural units and which is optionally further substituted and/or optionally comprises one or more heteroatoms; wherein R 1 represents an organic radical which may optionally contain one or more heteroatoms and which may further contain one or more additional free isocyanate groups and/or one or more urethane, biuret, carbodiimide, isocyanurate, allophanate, iminooxadiazinedione and/or uretdione structural units; and wherein n≧2.