Abstract: An active energy beam-curable composition includes a photo-cationic polymerizable substance; a photo-cationic polymerization initiator; and an oxetane compound such as 3-ethyl-3-hydroxymethyloxetane, di[1-ethyl(3-oxetanyl)]methyl ether, and 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane. Owing to the oxetane compound contained in the composition, it is possible to suppress the occurrence of odor and cloudiness even when the composition is heated after being cured.

Abstract: A photo-curing ink composition comprises a photocation-polymerizable substance, a photocation polymerization initiator, and a surfactant having a functional group. The surfactant is selected and the amount thereof is adjusted so that the acid value per 100 g of the ink composition is not more than 150 mg KOH. The surfactant is selected and the amount thereof is adjusted so that the amine value per 100 g of the ink composition is not more than 23 mg KOH. The ink composition is excellent in dispersion performance, storage stability, and curing performance.

Abstract: An active energy beam-curable composition includes a photo-cationic polymerizable substance; a photo-cationic polymerization initiator; and a polymerizable compound having an ethylenic unsaturated double bond such as monomethacrylate, dimethacrylate, monoacrylate, and diacrylate. Owing to the compound having the ethylenic unsaturated double bond contained in the composition, it is possible to suppress the occurrence of odor and cloudiness even when the composition is heated after being cured.

Abstract: An image-receiving layer composition is coated on a surface of a substrate of an ink-jet recording medium, used to form an image with the ink-jet system, to form an image-receiving layer. The composition includes an epoxy compound, an oxetane compound and a photo-cationic polymerization initiator. The composition is cured with an active energy beam. An image of an ink is formed on the image-receiving layer. Further, an overcoat layer is formed on the image. Also the ink and the overcoat layer may include an epoxy compound, an oxetane compound and a photo-cationic polymerization initiator.

Abstract: An active energy beam-curable composition comprises an epoxy compound, an oxetane compound, a photo-cationic polymerization initiator, a pigment as a coloring agent, and a pigment dispersing agent. The pigment dispersing agent contains an active ingredient of a comb-shaped polymer in which an anchor is a base and which is liquid at room temperature. Therefore, the adhesion performance is satisfactory even on a base material such as polycarbonate on which it has been impossible to obtain any satisfactory adhesion performance with any conventional active energy beam-curable composition.

Abstract: An active energy beam-curable composition comprises a photo-cationic polymerizable substance; a photo-cationic polymerization initiator; and a polymerizable compound having an ethylenic unsaturated double bond such as monomethacrylate, dimethacrylate, monoacrylate, and diacrylate. Owing to the compound having the ethylenic unsaturated double bond contained in the composition, it is possible to suppress the occurrence of odor and cloudiness even when the composition is heated after being cured.

Abstract: An active energy beam-curable composition comprises a photo-cationic polymerizable substance; a photo-cationic polymerization initiator; and an oxetane compound such as 3-ethyl-3-hydroxymethyloxetane, di[1-ethyl(3-oxetanyl)]methyl ether, and 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane. Owing to the oxetane compound contained in the composition, it is possible to suppress the occurrence of odor and cloudiness even when the composition is heated after being cured.

Abstract: A photo-curing ink composition comprises a photocation-polymerizable substance, a photocation polymerization initiator, and a surfactant having a functional group. The surfactant is selected and the amount thereof is adjusted so that the acid value per 100 g of the ink composition is not more than 150 mg KOH. The surfactant is selected and the amount thereof is adjusted so that the amine value per 100 g of the ink composition is not more than 23 mg KOH. The ink composition is excellent in dispersion performance, storage stability, and curing performance.

Abstract: The fast-curing photosensitive composition capable of being cured by the irradiation with light, comprises a radical-polymerizable unsaturated compound, a photopolymerization initiator, and a thiol-containing compound, whereby the fast-curing photosensitive composition can be adequately cured even with low exposure energy.

Abstract: A photosensitive recording material comprises a support and microcapsules provided thereon, wherein the microcapsules comprises a photopolymerizable unsaturated group-containing compound and a phosphine compound represented by the following general formula: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 indicate a hydrogen atom, a C.sub.1 to C.sub.20 alkyl, aryl or aralkyl group, --OR.sup.4, or --SR.sup.4 where R.sup.4 indicates a hydrogen atom or a C.sub.1 to C.sub.20 alkyl, aryl or aralkyl group, and these may be substituted by a halogen atom or a C.sub.1 to C.sub.20 alkoxy, alkoxycarbonyl, acyloxy, alkanoyl, cyano, hydroxy or amino group.