no 2 oh och 3 ocn scn an optionally fluorinated carbonyl or carboxyl group with up to 4 c atoms or a mono oligo or polyfluorinated alkyl or alkoxy group with 1 to 4 c atoms the term u2018 non polar group u2019 means an alkyl group with 1 or more preferably 1 to 12 c atoms or an alkoxy group with 2 or more preferably 2 to 12 c atoms as a substrate for the preparation of the polymer films for example a glass or quarz sheet or a plastic film or sheet can be used it is also possible to put a second substrate on top of the coated mixture prior to and or during and or after polymerization the substrates can be removed after polymerization or not when using two substrates in case of curing by actinic radiation at least one substrate has to be transmissive for the actinic radiation used for the polymerization isotropic or birefringent substrates can be used in case the substrate is not removed from the polymerized film after polymerization preferably isotropic substrates are used preferably at least one substrate is a plastic substrate such as for example a film of polyester such as polyethyleneterephthalate pet polyvinylalcohol pva polycarbonate pc or triacetylcellulose tac especially preferably a pet film or a tac film as a birefringent substrate for example an uniaxially stretched plastic film can be used for example pet films are commercially available from ici corp under the trade name melinex the polymerizable material can also be dissolved in a solvent preferably in an organic solvent the solution is then coated onto the substrate for example by spin coating or other known techniques and the solvent is evaporated off before polymerization in most cases it is.