available commercially which are referred to as hydroxypropyl meth acrylate of the isomeric adducts of methyloxirane with meth acrylic acid these mixtures containing 2 hydroxypropyl meth acrylate and 1 hydroxypropyl 2 meth acrylate in each case alone or in a mixture with one another the monomers b are alkyl esters of monoolefinically unsaturated monocarboxylic acids as stated under a1 or dialkyl esters of olefinically unsaturated dicarboxylic acids as stated under a2 or mixtures thereof the alkyl radicals being linear branched or cyclic and having from 1 to 20 carbon atoms and the carboxylic acids having from 3 to 12 carbon atoms preference is given to esters of acrylic or methacrylic acid and also of maleic acid with the alcohols methanol ethanol n and iso propanol n iso sec and tert butanol amyl alcohol n hexanol cyclohexanol and 2 ethylhexanol particular preference is given to methyl methacrylate ethyl meth acrylate n butyl meth acrylate dimethyl maleate and 2 ethylhexyl meth acrylate the monomers c are per fluoroalkyl esters of the carboxylic acids stated under a1 the per fluoroalkyl group having from 2 to 20 carbon atoms suitable examples include trifluoroethyl meth acrylate hexafluoroisopropyl meth acrylate heptafluorobutyl meth acrylate and perfluorooctyl meth acrylate the higher perfluoroalkanols are preferably obtained conventionally by telomerization of tetrafluoroethylene and are then converted into the desired esters c n f 2n 1 o u2014 co u2014 r where n 2 to 20 also suitable are esters of partly fluorinated alcohols in which context the commercially available mixtures of the 2 perfluoroalkyl ethyl esters of acrylic and methacrylic acid.