the isocyanate containing constituent with the alcohol containing constituent to give the urethane meth acrylate according to a can be accelerated in a manner known per se by means of suitable catalysts including tin octoate dibutyltin dilaurate or tertiary amines the resulting urethane meth acrylate containing free nco groups must be stabilized against premature polymerization by addition of suitable inhibitors and antioxidants including phenols hydroquinones and optionally also quinones such as e g 2 5 di tert butylquinone these inhibitors are added in amounts of in each case 0 001 to 0 3 wt during or after the preparation the products can be prepared in solvents which are inert in the sense of the preparation and later use further polyisocyanates mentioned under point b are preferably polyisocyanates based on butylene diisocyanate hexamethylene diisocyanate hdi isophorone diisocyanate ipdi trimethylhexamethylene diisocyanate 2 2 4 and or 2 4 4 trimethylhexamethylene diisocyanate neopentyl diisocyanate di isocyanatocyclo hexyl methane or 4 isocyanatomethyl 1 8 octane diisocyanate which contain urethane isocyanurate allophanate biuret uretdione or iminooxadiazinedione structural units or mixtures thereof uv initiators corresponding to point c can be 2 hydroxyphenyl ketones such as e g 1 hydroxycyclohexyl phenyl ketone benzil ketals such as e g benzil dimethyl ketal acylphosphine oxides such as e g bis 2 4 6 trimethylbenzoyl phenylphosphine oxide diacylphosphine oxides benzophenone and derivatives thereof or mixtures of the various types of uv initiators compounds corresponding to point d which are reactive with isocyanates include polyols these can be obtained by esterification of di or triols with dicarboxylic acids hydroxy functional copolymers prepared substantially from meth acrylic acid esters hydroxyalkyl meth acrylic acid esters and optionally styrene and or other monomers such as.