as benzoquinone hydroquinone hydroquinone monomethyl ether catechol phenothiazine or the like or to introduce air or oxygen into the reaction system for preventing polymerization of meth acryloyl groups the urethane modified meth acrylate useful in the practice of this invention is terminated usually in meth acryloyloxy groups some of such terminal meth acryloyloxy groups may be replaced by isocyanate or hydroxyl groups exemplary mono meth acrylates b which are represented by the general formula i and are useful in the practice of this invention may include the meth acrylates of monohydroxy compounds each of which is obtained by adding one or more moles of ethylene oxide propylene oxide butyrolactone valerolactone caprolactone or the like to one mole of furfuryl alcohol or tetrahydrofurfuryl alcohol as specific examples of such mono meth acrylates b may be mentioned ethylene glycol monofurfuryl ether meth acrylate ethylene glycol monotetrahydrofurfuryl ether meth acrylate propylene glycol monotetrahydrofurfuryl ether meth acrylate diethylene glycol monofurfuryl ether meth acrylate dipropylene glycol monotetrafurfuryl ether meth acrylate tetraethylene glycol monotetrahydrofurfuryl ether meth acrylate hexapropylene glycol monotetrahydrofurfuryl ether meth acrylate the meth acrylate of addition product between furfuryl alcohol and u03b3 butyrolactone the meth acrylate of addition product between tetrafurfuryl alcohol and 3 moles of u03b3 butyrolactone the meth acrylate of addition product between tetrahydrofurfuryl alcohol and u03b5 caprolactone the meth acrylate of addition product between furfuryl alcohol and 3 moles of.