[C:1]([O-:5])(=[O:4])[CH:2]=[CH2:3].[C:6](O)(=O)C=C.C(O)(=O)C=C.C(O)(=O)C=C.C(C(CO)(CO)C)O.C(O)(=O)C=C.C(O)(=O)C=C.C(C(CO)(CO)CC)O.OCC(CO)(COCC(CO)(CO)CO)CO>>[C:1]([O-:5])(=[O:4])[CH:2]=[CH2:3].[C:1]([O-:5])(=[O:4])[C:2]([CH3:6])=[CH2:3]The monomer or oligomer used in the invention is preferably a monomer or oligomer which has two or more ethylenic unsaturated double bonds and which is addition-polymerized by irradiation with light. The monomer or oligomer may be a compound having at least one addition-polymerizable ethylenic unsaturated group therein and having a boiling point of 100° C. or higher at a normal pressure. Examples thereof include: a monofunctional acrylate and a monofunctional methacryalte such as polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acryalte and phenoxyethyl(meth)acrylate; polyethylene glycol di(meth)acryalte, polypropylene glycol di(meth)acrylate, trimethylolethane triacrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane diacrylate, neopentyl glycol di(meth)acrylate, pentaerythritol tetra(meth)acryalte, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acryalte, dipentaerythritol penta(meth)acrylate, hexanediol di(meth)acrylate, trimethylolpropane tri(acryloyloxypropyl)ether, tri(acryloyloxyethyl)isocyanurate, tri(acryloyloxyethyl)cyanurate, glycerin tri(meth)acrylate; a polyfunctional acrylate or polyfunctional methacrylate which may be obtained by adding ethylene oxide or propylene oxide to a polyfunctional alcohol such as polymethylolpropane or glycerin and converting the adduct into a (meth)acrylate.
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