An ink set includes an ink-jet color ink that contains a colorant, an organic solvent, a polymerizable compound, and a photopolymerization initiator and a clear ink which contains an organic solvent and a vinyl chloride-vinyl acetate copolymer and in which Mt2/Mt1 is 0.40 or more where Mt1 represents a total mass content of a nonvolatile component, and Mt2 represents a mass content of the vinyl chloride-vinyl acetate copolymer.

An ink set includes an ink-jet color ink that contains a colorant, an organic solvent, a polymerizable compound, and a photopolymerization initiator and a clear ink which contains an organic solvent and a vinyl chloride-vinyl acetate copolymer and in which Mt2/Mt1 is 0.40 or more where Mt1 represents a total mass content of a nonvolatile component, and Mt2 represents a mass content of the vinyl chloride-vinyl acetate copolymer.

An ink composition contains: water; and a particle including a photopolymerizable monomer and a polymer having a blocked isocyanate group having an unblocking temperature of 150° C. or less.

An ink composition contains: water; and a particle including a photopolymerizable monomer and a polymer having a blocked isocyanate group having an unblocking temperature of 150° C. or less.

A vat resin for three-dimensional stereolithography printing of a thiourethane polymer part comprising a liquid mixture including a first type of monomer, a second type of monomer, a photolatent base decomposable upon exposure to a light to form a non-nucleophillic base catalyst having a pKa greater than 7, an anionic step-growth polymerization reaction inhibitor having an acidic group configured to form an acid-base pair with the non-nucleophillic base and a light absorber having an absorbance in the liquid mixture that is greater than an absorbance of the photolatent base at a wavelength of the light used for the exposure. Methods of preparing the vat resin and three-dimensional stereolithography printing a thiourethane polymer part using the vat resin are also disclosed.

A vat resin for three-dimensional stereolithography printing of a thiourethane polymer part comprising a liquid mixture including a first type of monomer, a second type of monomer, a photolatent base decomposable upon exposure to a light to form a non-nucleophillic base catalyst having a pKa greater than 7, an anionic step-growth polymerization reaction inhibitor having an acidic group configured to form an acid-base pair with the non-nucleophillic base and a light absorber having an absorbance in the liquid mixture that is greater than an absorbance of the photolatent base at a wavelength of the light used for the exposure. Methods of preparing the vat resin and three-dimensional stereolithography printing a thiourethane polymer part using the vat resin are also disclosed.

The photocurable inkjet ink contains: a radical polymerizable compound; a photoinitiator; and a thixotropic agent, and has a first viscosity of 1,000 mPa.Math.s or less as measured at a shear rate of 10,000 s.sup.−1, and a second viscosity of 10,000 mPa.Math.s or more as measured at a shear rate set to 10.sup.−1 s.sup.−1 after a shear force is continuously applied at the shear rate of 10,000 s.sup.−1 for 30 seconds.

In one aspect, inks for use with a three-dimensional (3D) printing system are described herein. In some embodiments, an ink described herein comprises up to 80 wt. % oligomeric curable material; up to 80 wt. % monomeric curable material; up to 10 wt. % photoinitiator; up to 1 wt. % non-curable absorber material; and up to 10 wt. % one or more additional components, based on the total weight of the ink, and wherein the total amount of the foregoing components is equal to 100 wt. %. Additionally, the photoinitiator is operable to initiate curing of the oligomeric curable material and/or the monomeric curable material when the photoinitiator is exposed to incident curing radiation having a peak wavelength λ. Moreover, the ink has a penetration depth (D.sub.p), a critical energy (E.sub.c), and a print through depth (D.sub.PT) at the wavelength λ of less than or equal to 2×D.sub.p.

In one aspect, inks for use with a three-dimensional (3D) printing system are described herein. In some embodiments, an ink described herein comprises up to 80 wt. % oligomeric curable material; up to 80 wt. % monomeric curable material; up to 10 wt. % photoinitiator; up to 1 wt. % non-curable absorber material; and up to 10 wt. % one or more additional components, based on the total weight of the ink, and wherein the total amount of the foregoing components is equal to 100 wt. %. Additionally, the photoinitiator is operable to initiate curing of the oligomeric curable material and/or the monomeric curable material when the photoinitiator is exposed to incident curing radiation having a peak wavelength λ. Moreover, the ink has a penetration depth (D.sub.p), a critical energy (E.sub.c), and a print through depth (D.sub.PT) at the wavelength λ of less than or equal to 2×D.sub.p.

A light-irradiating device of the disclosure comprises: a light-irradiating unit comprising a housing in which a light-emitting element is disposed, the housing comprising a light irradiation surface through which light from the light-emitting element can be transmitted; and a gas supply unit comprising a flow channel connected to a part of the light irradiation surface of the housing. A printing device of the disclosure comprises: the light-irradiating device mentioned above; a conveying unit which conveys a medium to be printed while causing the medium to face the light irradiation surface of the light-irradiating device; and a printing unit which is disposed adjacent to and upstream from the light-irradiating device in a conveyance direction of the medium to be printed.