. . . "poly-n-butylene oxide group having from 2 to 50 recurring alkoxy units, or Z3 is an alkyl group having from 1to 12 carbon atoms that contains halogen atoms, especially fluorine atoms, or Z3 is a siloxane group having from 1to 6 Si atoms; acrylamides and methacrylamides of formula III wherein W and Y0 are hydrogen, X0 is hydrogen or methyl and Z is monosubstituted aminocarbonyl substituted by a gro" .