Photocurable ink composition for inkjet printing, and printed material

摘要

A photocurable ink composition for inkjet printing is obtained that has superior curability with respect to light from a light-emitting diode, has favorable adhesion to a polyvinyl chloride-based sheet, and is able to adequately inhibit the occurrence of cockling. The photocurable ink composition for inkjet printing at least has: a photopolymerizable compound; a photopolymerization initiator; and a sensitizer, wherein benzyl acrylate, N-vinylcaprolactam and an acrylated amine compound having two photopolymerizable functional groups and two amino groups in a molecule thereof are contained as the photopolymerizable compound, the content of the benzyl acrylate is 20 to 65% by mass in the photocurable ink composition for inkjet printing, a compound exhibiting an initiator function when irradiated with light having a wavelength of 450 to 300 nm is contained as the photopolymerization initiator, a compound exhibiting a sensitizer function when irradiated with light having a wavelength of 400 nm or longer is contained as the sensitizer, and a flash point as measured using a SETA closed-cup flash point tester according to a method in compliance with JIS K2265 is 70° C. or higher.

主权项

1. A photocurable ink composition for inkjet printing, comprising: a photopolymerizable compound; a photopolymerization initiator; and a sensitizer, wherein
the photopolymerizable compound comprises:
benzyl acrylate in an amount from 40 to 60% by mass relative to the photocurable ink composition;N-vinylcaprolactam in an amount from 1 to 30% by mass relative to the photocurable ink composition;an acrylated amine compound having two photopolymerizable functional groups and two amino groups in a molecule thereof in an amount from 5 to 20% by mass relative to the photocurable ink composition; andat least one material selected from the group consisting of isobornyl acrylate and tetrahydrofurfuryl acrylate in an amount from 5 to 40% by mass relative to the photocurable ink composition, wherein the photocurable ink composition does not include phenoxyethyl acrylate, a compound exhibiting an initiator function when irradiated with light having a wavelength from 450 to 300 nm is contained as the photopolymerization initiator, a compound exhibiting a sensitizer function when irradiated with light having a wavelength of 400 nm or longer is contained as the sensitizer, and the flash point of the photocurable ink composition as measured using a SETA closed-cup flash point tester according to a method in compliance with JIS K2265 is 70° C. or higher.