| 摘要 |
A ultraviolet-curable coating agent contains: a hydrophilic polymer having the specific structure represented by the following general formula (1); a polymerization-reactive urethane oligomer; a water-soluble monomer; a photo polymerization initiator; and a water-absorptive filler. The polymerization-reactive urethane oligomer is preferably formed of a carboxyl-group-containing dihydroxyl compound, polymer polyol, organic diisocyanate compound and hydroxyl-group-containing acrylic ester, and a number average molecular weight of the polymerization-reactive urethane oligomer is preferably 1000 to 10000. By applying the ultraviolet-curable coating agent onto a front face of a substrate, an ink-receiving layer having excellent ink absorptivity, drying characteristics of printed images, bleeding resistance, anti-tacking and water resistance can be formed. where: P represents an integer of 2 or more; R1 represents—H or—CH3; R2 represents—H or an alkyl group represented by—CmH2m+1 (in which m is an integer of 1 to 8); R3 represents an alkylene group represented by—CnH2n—(in which n is an integer of 1 to 8); and R4 and R5 each represent—H or an alkyl group represented by—CoH2o+1 (in which o is an integer of 1 to 8). body.
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