Abstract: An ink set of radiation curable ink jet compositions, includes: an under layer ink; and an over layer ink, and the under layer ink contains, as a polymerizable compound, 80.0 percent by mass or more of a monofunctional polymerizable compound with respect to a total mass of polymerizable compounds and contains 55.0 percent by mass or more of a polymerizable compound having a nitrogen heterocyclic structure and/or a polymerizable compound having a hydroxy group in total with respect to the total mass of the polymerizable compounds.

Abstract: An information processing device according to the present application includes a generation unit and a providing unit. The generation unit uses a model that is trained to learn a relationship between a criterion for classifying users of a first company and a criterion for classifying users of a second company to generate a criterion (common key) for classifying the users of the second company into a first category, from the criterion for classifying the users of the first company into the first category. The providing unit provides a criterion generated by the generation unit.

Abstract: A replacement lead case includes a case body that forms an inner space surrounded by a rear surface plate and right and left leg plates as a replacement lead accommodation room and has a lid body on the tip end thereof and a case part on a rear part thereof via a bendable thin part provided on the rear surface plate, and a cover member that has a U-shaped cross-section orthogonal to a longitudinal direction molded by a front surface plate and right and left outer leg plates covers the replacement lead accommodation room on a case body with the front surface plate and slidably supports the case body in the longitudinal direction with the leg plates positioned on the inside of the outer leg plates. A rail-shaped guide is formed on the lid body along the longitudinal direction, and the cover member includes a slider that contacts the guide.

Abstract: A radiation curable ink jet composition includes polymerizable compounds and a photopolymerization initiator, the polymerizable compounds include a monofunctional monomer, a content of the monofunctional monomer with respect to a total mass of the polymerizable compounds is 90 percent by mass or more, and the photopolymerization initiator includes ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate.

Abstract: A radiation curable ink jet composition includes polymerizable compounds; and a photopolymerization initiator, the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by the following general formula (I), a content of the vinyl ether group-containing (meth)acrylate with respect to a total mass of the radiation curable ink jet composition is 15 percent by mass or more, and the photopolymerization initiator includes ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate. H2C?CR1—CO—OR2—O—CH?CH—R3??(I) In the above formula, R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic residue having 2 to 20 carbon atoms, and R3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms.

Abstract: A radiation curable ink jet composition contains: a dispersant; a polymerizable compound; and a hindered amine compound represented by the following general formula (1) or (2), the radiation curable ink jet composition has a viscosity of 50 mPa·s or less at 25° C., and the dispersant has an acid value of 30 mgKOH/g or more, In the formula (1), R1 represents H—, O?, or R2—CO—, and R2 represents an alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aromatic ring, In the formula (2), R3 represents —OCO—R4—COO—, and R4 represents an alkyl group having 1 to 12 carbon atoms.

Abstract: A radiation curable ink jet composition according to an embodiment of the present disclosure is a radiation curable ink jet composition including a polymerizable compound, the polymerizable compound includes at least one selected from the group consisting of glycerin diacrylate and glycerin triacrylate, and a total content of the glycerin diacrylate and the glycerin triacrylate with respect to a total mass of the ink jet composition is 20 percent by mass or more.

Abstract: An ink jet recording method includes an overcoat layer forming step of forming an overcoat layer on a color layer formed on a recording medium by using a radiation-curable white ink composition and a radiation-curable clear ink composition. The overcoat layer forming step includes an ejection step O of ejecting, from an ink jet head O, the radiation-curable white ink composition and the radiation-curable clear ink composition to be attached to the recording medium and an irradiation step O of applying radiation to the radiation-curable white ink composition and the radiation-curable clear ink composition which are attached to the recording medium to obtain the overcoat layer, and a coverage of the recording medium by the overcoat layer is less than 100%.

Abstract: An ink jet recording apparatus including an ink jet head for ejecting and attaching a radiation-curable ink jet composition to a recording medium, an inert gas supply portion for supplying an inert gas to the recording medium to which the radiation-curable ink jet composition is attached, and an irradiation portion for applying radiation to the radiation-curable ink jet composition attached to the recording medium under supply of an inert gas, wherein the inert gas supply portion slantingly ejects the inert gas toward just under the irradiation portion.

Abstract: An ink jet recording apparatus including an ink jet head for ejecting and attaching a radiation-curable ink jet composition to a recording medium and an irradiation unit for applying radiation to the recording medium to which the radiation-curable ink jet composition is attached under supply of an inert gas, wherein the irradiation unit has, successively in a transport direction of the recording medium, a nozzle face for ejecting the inert gas and an application face for applying radiation, and h1>h2, where h1 is a distance from the recording medium to the nozzle face and h2 is a distance from the recording medium to the application face.

Abstract: [PROBLEM TO BE SOLVED] To provide a bulk wave resonator having a high frequency passband. [SOLUTION] A bulk wave resonator using a bulk wave, includes a support substrate, an acoustic multilayer film that includes, stacked on the support substrate, a plurality of types of dielectrics having different acoustic impedances, a piezoelectric layer that is stacked on the acoustic multilayer film, a first electrode, and a second electrode. The first and second electrodes are disposed to face each other with a gap therebetween on a first surface of the piezoelectric layer opposite to the acoustic multilayer film, and are applied with a voltage for allowing the piezoelectric layer to generate the bulk wave. A direction that is parallel to the surface of the piezoelectric layer and in which the first electrode and the second electrode face each other is defined as a first direction.

Abstract: An ink jet recording method is a method in which a cyan ink, a magenta ink, a black ink, and a yellow ink radiation that are curable inks are ejected from ink jet heads to attach the radiation curable inks to a recording medium. The method includes, in this order, a first step of attaching the cyan ink, the magenta ink, and the black ink onto the recording medium and applying temporary curing radiation to the recording medium and a second step of attaching the yellow ink onto the recording medium and applying full curing radiation to the recording medium without applying the temporary curing radiation.

Abstract: A method for producing a recorded matter includes a first ejection step of ejecting a first ink, which is a radiation-curable ink jet composition, and adhering the first ink to a recording medium, a first irradiation step of irradiating radiation to the first ink adhered to the recording medium to obtain a cured coating film of the first ink, a second ejection step of ejecting a second ink, which is a radiation-curable ink jet composition, and adhering the second ink to the cured coating film of the first ink so that the duty is 1% or more and 20% or less, a second irradiation step of irradiating radiation to the second ink adhered to the recording medium to cure the second ink to obtain a recorded matter, and a lamination step of laminating, in the recorded matter, a recording surface to which the first ink and the second ink have been adhered, and a non-recording surface to which the first ink and the second ink have not been adhered, so that both surfaces face each other.

Abstract: A radiation-curable ink jet composition includes vinyl methyl oxazolidinone and a vinyl ether group-containing (meth)acrylate represented by the following formula (1): H2C?CR1—CO—OR2—O—CH?CH—R3 (where, R1 is a hydrogen atom or a methyl group, R2 is a divalent C2-C20 organic residue, and R3 is a hydrogen atom or a monovalent C1-C11 organic residue).

Abstract: An ink jet recording method includes ejecting a radiation-curable ink jet composition to a recording medium from an ink jet head, and curing the ink jet composition ejected to the recording medium by irradiating with radiation from a LED irradiator having a peak wavelength of 250 to 310 nm to form a cured coating film. The ink jet composition contains a polymerizable compound and an ?-hydroxyketone-based initiator.

Abstract: An ink set of radiation curable ink jet compositions, includes: an under layer ink; and an over layer ink, and the under layer ink contains, as a polymerizable compound, 80.0 percent by mass or more of a monofunctional polymerizable compound with respect to a total mass of polymerizable compounds and contains 55.0 percent by mass or more of a polymerizable compound having a nitrogen heterocyclic structure and/or a polymerizable compound having a hydroxy group in total with respect to the total mass of the polymerizable compounds.

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 composition includes polymerizable compounds; and a photopolymerization initiator, the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by the following general formula (I), a content of the vinyl ether group-containing (meth)acrylate with respect to a total mass of the radiation curable ink jet composition is 15 percent by mass or more, and the photopolymerization initiator includes ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate. H2C?CR1—CO—OR2—O—CH?CH—R3??(I) In the above formula, R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic residue having 2 to 20 carbon atoms, and R3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms.

Abstract: A radiation curable ink jet composition includes polymerizable compounds and a photopolymerization initiator, the polymerizable compounds include a monofunctional monomer, a content of the monofunctional monomer with respect to a total mass of the polymerizable compounds is 90 percent by mass or more, and the photopolymerization initiator includes ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate.

Abstract: A radiation curable ink comprises a compound represented by the following Formula (I): a compound represented by the following Formula (II): and a compound represented by the following Formula (III):