Typical examples of such other polymerizable monomers include an aromatic ring-containing (meth)acrylate (hereinafter referred to as a (meth)acrylate (A)) of the formula (I): wherein R1 is a hydrogen atom or a methyl group, R2 is an aromatic ring which may be substituted by at least one substituent, such as a C1-10 alkyl group or a halogen atom such as a fluorine atom, a chlorine atom or a bromine