Abstract: A radiation-curable ink jet composition includes a monofunctional (meth)acrylate monomer and vinyl methyl oxazolidinone.

Abstract: A radiation-curing ink jet ink composition includes a urethane (meth)acrylate including one (meth)acryloyl group, the amount of the urethane (meth)acrylate being 5.0% by mass or more and 30.0% by mass or less of the total amount of the ink composition, and a (meth)acrylate including an aromatic ring and one (meth)acryloyl group, the amount of the (meth)acrylate being 4.0% by mass or more and 50.0% by mass or less of the total amount of the ink composition.

Abstract: A UV-curable ink jet ink composition includes: 10.00% by mass or more and 60.00% by mass or less, relative to a total mass of the ink composition, of a compound represented by formula (A); 10.00% by mass or more and 50.00% by mass or less, relative to the total mass of the ink composition, of one or more monofunctional monomers having an alicyclic hydrocarbon group or a cyclic ether group; 0.05% by mass or more and 0.50% by mass or less, relative to the total mass of the ink composition, of one or more fluorescent brighteners including a compound represented by formula (b1), (b2), (b3), or (b4); and 3.00% by mass or more and 8.00% by mass or less, relative to the total mass of the ink composition, of one or more acylphosphine oxide polymerization initiators.

Abstract: A radiation-curable ink jet ink set according to the present disclosure includes: a radiation-curable clear ink composition; and a radiation-curable color ink composition, where: the clear ink composition contains a hydrogen abstraction-type photoinitiator and a hydroxy group-containing monomer; and the color ink composition contains an intramolecular cleavage-type photoinitiator and a colorant.

Abstract: A radiation curable ink composition includes 5 to 30 mass % of a monofunctional urethane (meth)acrylate and 5 to 30 mass % of a nitrogen-containing monofunctional monomer having a cyclic skeleton containing a nitrogen atom.

Abstract: A radiation curable ink comprises a compound represented by the following Formula (I): (in Formula (I), R1 is a hydrogen atom or a methyl group, R2 is a divalent organic residue having 2 to 20 carbon atoms, and R3 is a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms), a compound represented by the following Formula (II): (in Formula (II), R1 is a hydrogen atom or a methyl group, R4 is a divalent organic residue having 2 to 5 carbon atoms, and n is an integer of 1 to 3), and a compound represented by the following Formula (III): (in Formula (III), R1 is a hydrogen atom or a methyl group, R5 is a divalent organic residue having 2 to 5 carbon atoms, R6 is an alkyl group having 1 to 10 carbon atoms or a hydroxyalkyl group having 1 to 10 carbon atoms, and m is an integer of 1 to 3).

Abstract: A radiation-curable ink jet composition contains at least one monomer A represented by general formula (I): CH2?CR1—COOR2—O—CH?CH—R3, wherein R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic moiety having a carbon number of 2 to 20, and R3 represents a hydrogen atom or a monovalent organic moiety having a carbon number of 1 to 11. The composition also contains a cyclic, linear, or branched monomer B containing a (meth)acryloyloxy or (meth)acryloyl group in which the total number of nitrogen atoms and oxygen atoms other than the oxygen atoms contained in the (meth)acryloyloxy or (meth)acryloyl group is at least 2, and at least one monomer C represented by the following general formula (II): wherein n represents an integer of 2 to 6. The total content of monomer A is 10% by mass or more relative to the total mass of the ink jet composition.

Abstract: A radiation curable ink jet composition contains an acrylate oligomer (A), a monofunctional monomer (B), and a predetermined monomer (C), in which the acrylate oligomer (A) has 1 to 3 acryloyl groups, the glass transition temperature of a homopolymer of the monofunctional monomer (B) is ?20° C. or more and 30° C. or less, and the content of the monofunctional monomer (B) is 40% by mass or more based on the entire radiation curable ink jet composition.

Abstract: A radiation-curable ink jet composition contains monomer A represented by formula (1), a mono-, bi-, or trifunctional urethane (meth)acrylate oligomer, and an N-vinyl compound: CH2?CR1—COOR2—O—CH?CH—R3??(1) where R1 denotes —H or —CH3, R2 denotes an organic residue having 2 to 20 carbon atoms, and R3 denotes a hydrogen atom or an organic residue having 1 to 11 carbon atoms.

Abstract: There is provided a radiation curable ink jet composition including: a monomer A that has one of a (meth)acryloyloxy group and a (meth)acryloyl group and has a cyclic structure containing one or more nitrogen atoms and one or more oxygen atoms in addition to the (meth)acryloyloxy group and the (meth)acryloyl group; and a monofunctional monomer B other than the monomer A; in which the content of the monomer A is equal to or less than 25% by mass with respect to the total mass of the composition, and in which mol average Tg of the monomer A and the monofunctional monomer B is equal to or greater than 45° C.

Abstract: An ink jet method includes a dissolved gas amount control step of controlling a dissolved gas amount of a radiation curable ink jet composition by a dissolved gas amount control unit at least a part of a flow path connecting a container receiving the ink jet composition and an outlet of an ink jet head to which the ink jet composition is supplied from the container; and an ejection step of ejecting the ink jet composition from the outlet of the ink jet head. The ink jet composition contains a polymerizable compound and a polymerization initiator, the dissolved gas amount control unit includes a member formed from an adhesive, and an absolute value (|(?1)?(?2)|) of the difference between a mass average SP value (?1) of the polymerizable compound and a SP value (?2) of the adhesive, each of which is calculated by Small's formula, is 1.0 or more.

Abstract: Provided is a radiation curing type ink jet ink composition simultaneously satisfying excellent adhesiveness of a cured film to a recording medium, excellent hardenability, and excellent flexibility of the cured film in a well-balanced state. The composition includes a (meth)acrylate monomer A including a vinyl ether group, a monofunctional (meth)acrylate monomer B including a cyclic ether skeleton having two or more ether groups, a monofunctional (meth)acrylate monomer C including an aromatic ring skeleton, and a photopolymerization initiator. The contents of the monomer A, the monomer B, and the monomer C are 5 to 35 mass %, 23 to 55 mass %, and 13 to 46 mass %, respectively, based on the total mass of the composition.

Abstract: An ink jet method includes a dissolved gas amount control step of controlling a dissolved gas amount of a radiation curable ink jet composition by a dissolved gas amount control unit at least a part of a flow path connecting a container receiving the ink jet composition and an outlet of an ink jet head to which the ink jet composition is supplied from the container; and an ejection step of ejecting the ink jet composition from the outlet of the ink jet head. The ink jet composition contains a polymerizable compound and a polymerization initiator, the dissolved gas amount control unit includes a member formed from an adhesive, and an absolute value (|(?1)?(?2)|) of the difference between a mass average SP value (?1) of the polymerizable compound and a SP value (?2) of the adhesive, each of which is calculated by Small's formula, is 1.0 or more.

Abstract: A radiation curable ink jet composition contains an acrylate oligomer (A), a monofunctional monomer (B), and a predetermined monomer (C), in which the acrylate oligomer (A) has 1 to 3 acryloyl groups, the glass transition temperature of a homopolymer of the monofunctional monomer (B) is ?20° C. or more and 30° C. or less, and the content of the monofunctional monomer (B) is 40% by mass or more based on the entire radiation curable ink jet composition.

Abstract: A radiation-curable ink jet composition contains at least one monomer A represented by general formula (I): CH2?CR1—COOR2—O—CH?CH—R3, wherein R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic moiety having a carbon number of 2 to 20, and R3 represents a hydrogen atom or a monovalent organic moiety having a carbon number of 1 to 11. The composition also contains a cyclic, linear, or branched monomer B containing a (meth)acryloyloxy or (meth)acryloyl group in which the total number of nitrogen atoms and oxygen atoms other than the oxygen atoms contained in the (meth)acryloyloxy or (meth)acryloyl group is at least 2, and at least one monomer C represented by the following general formula (II): wherein n represents an integer of 2 to 6. The total content of monomer A is 10% by mass or more relative to the total mass of the ink jet composition.

Abstract: An image recording method according to this invention is an image recording method using an ink jet ink composition containing a pigment, in which the maximum particle size of the pigment is 2.5 ?m or less and recording is performed with continuous scanning time of 10 minutes or more.

Abstract: A radiation-curable ink jet composition contains monomer A represented by formula (1), a mono-, bi-, or trifunctional urethane (meth)acrylate oligomer, and an N-vinyl compound: CH2?CR1—COOR2—O—CH?CH—R3??(1) where R1 denotes —H or —CH3, R2 denotes an organic residue having 2 to 20 carbon atoms, and R3 denotes a hydrogen atom or an organic residue having 1 to 11 carbon atoms.

Abstract: An ink jet method includes supplying a radiation curable composition to a discharging head via a composition flow channel; and discharging the radiation curable composition from the discharging head, in which the composition flow channel includes a gear pump that causes the radiation-curable composition to flow in the composition flow channel, and an air supply mechanism that supplies air to the radiation curable composition further to the upstream side in the flow direction than the gear pump.

Abstract: There is provided a radiation curable ink jet composition including: a monomer A that has one of a (meth)acryloyloxy group and a (meth)acryloyl group and has a cyclic structure containing one or more nitrogen atoms and one or more oxygen atoms in addition to the (meth)acryloyloxy group and the (meth)acryloyl group; and a monofunctional monomer B other than the monomer A; in which the content of the monomer A is equal to or less than 25% by mass with respect to the total mass of the composition, and in which mol average Tg of the monomer A and the monofunctional monomer B is equal to or greater than 45° C.

Abstract: An ultraviolet curable composition includes a polymerizable compound and is stored in a storage body, in which an amount of water is greater than or equal to 0.05 mass % and less than or equal to 1.0 mass % with respect to a total amount of the ultraviolet curable composition, a content of at least one metal element selected from a group consisting of Li, Na, K, Ag, Mg, Ca, Ba, Zn, Fe, Sn, Al, and Zr is greater than or equal to 10 ppm by mass, and a content of each metal element included in the group is less than or equal to 250 ppm by mass.