| abstract |
Process for coating with polyurethane ureas, characterized in that a substrate with a product containing the prepolymer having an average of 2 ketoxime-blocked NCO groups and having an average molecular weight of 500 to 15,000 based on an aromatic polyisocyanate with B) by reaction A) Chain extender of the formula H₂N-R'-NH₂ in which R 'represents an aliphatic radical, in the presence of solvents at temperatures> 50 ° C and with an equivalent ratio of blocked NCO groups to NH₂ groups from 1.43 to 1.02 with conversion of 40 to 90% of the available Amino groups has been obtained, coated, and the reaction is then completed with crosslinking at temperatures> 120 ° C. |