Patent ID: 7649106

Claim:
A method for preparing a diol (meth)acrylate compound having a urethane bond represented by the formula (1): Wherein R 1 stands for a hydrogen atom or a mythyl group, R 2 stands for —(CH 2 )n-, R 3 stands for —(CH 2 )m-, provided that n is an integer of 1 to 4 and m is an integer of 1 to 8; (AO) stands for an oxyalkylene group having 2 to 4 carbon atoms, and x is an integer of 0 to 1000, said method comprising the steps of: (a) subjecting a cyclic ketal represented by the formula (3) and a (meth)acryloyloxyalkyl isocyanate represented by the formula (4) to urethane reaction to obtain a cyclic ketal (meth)acrylate compound having a urethane bond represented by the formula (2): wherein R 1 stands for a hydrogen atom or a methyl group, R 2 stands for —(CH 2 )n-, and R 3 stands for —(CH 2 )m-, provided that n is an integer of 1 to 4 and m is an integer of 1 to 8; (AO) stands for an oxyalkylene group having 2 to 4 carbon atoms, x is an integer of 0 to 1000, R 4 and R 5 may either be the same or different, and each stands for a hydrogen atom, a methyl group, or an ethyl group, and (b) subjecting the compound represented by the formula (2) to hydrolytic ring-opening in a water-containing solvent in the presence of a catalyst.