acrylates and methacrylates of the general formula ##STR4## where R2 is as defined above and R5 is a straight chain or branched aliphatic, cycloaliphatic or aromatic group having up to 20 carbon atoms which is unsubstituted or substituted by one or more alkoxy, alkanoyloxy or alkyl of up to 12 carbon atoms, or by halo, especially chloro or preferably fluoro, or C3 -C5 polyalkyleneoxy of 2 to about