Abstract: A method for manufacturing a liquid ejection head in which an ejection orifice-forming member that forms ejection orifices for ejecting a liquid and a flow path for the liquid that communicates with the ejection orifices is formed on a substrate, the manufacturing method including forming a mold for the flow path for the liquid on the substrate; coating a photosensitive resin composition for forming the ejection orifice-forming member onto the substrate, on which the mold has been formed, to form a cationically polymerizable resin layer; and exposing and developing the cationically polymerizable resin layer to form the ejection orifice-forming member, wherein the photosensitive resin composition includes at least one epoxy resin selected from the group consisting of an alicyclic epoxy resin and a glycidyl epoxy resin, and a cationic photopolymerization initiator having specific structure and molar absorption coefficient.

Abstract: A method of manufacturing a liquid ejection head including, on a substrate, an ejection port formation member and a flow path formation member includes: forming and exposing a layer of a photosensitive resin composition (1) forming the flow path formation member on the substrate; laminating and exposing a layer of a photosensitive resin composition (2) forming the ejection port formation member on the layer of the photosensitive resin composition (1); and removing unexposed portions to form the flow path formation member and the ejection port formation member, the photosensitive resin composition (1) containing a specific epoxy resin and a specific gallate-based photoacid generator.

Abstract: A method for producing a laminate of a cured material from a photosensitive resin composition (1) and a photosensitive resin composition (2), wherein the method includes a step of obtaining a laminated material by laminating the composition (2) onto the composition (1); a step of subjecting the laminated material to photoexposure to obtain a photocured material; a step of developing the photocured material to obtain a developed material; and a step of heating the developed material to obtain a laminate, wherein the photoexposure dose required to cure the composition (2) is smaller than the dose required to cure the composition (1), and wherein the composition (1) contains an epoxy resin (1) having a weight-average molecular weight Mw of 5,000 to 600,000, a softening point of at least 140° C., and an epoxy equivalent weight of not more than 2,300.

Abstract: Provided is a liquid ejection head having a cured product of a liquid-repellent coating material, the coating material including a condensation product of a silane mixture containing a hydrolyzable silane compound (a) of a specific structure having a perfluoropolyether group and a cyclic polyorganosiloxane group and a hydrolyzable silane compound (b) having an epoxy group.

Abstract: A photosensitive resin composition comprising: an epoxy resin (A) represented by formula (1); an epoxy resin (B) that has an epoxy equivalent of 500 g/eq. or less and that is different from the epoxy resin (A) represented by formula (1); and a cationic polymerization catalyst, where, in formula (1), R1, R2, R3, R4, and X1 are each independently an alkyl group with carbon numbers of 1 to 12, an aryl group with carbon numbers of 6 to 12, or an epoxy-comprising group; X2 is an epoxy-comprising group; m+n is an integer from 1 to 60; and a sequence of a structure of parentheses marked with m and a sequence of a structure of parentheses marked with n may be random or block.

Abstract: An ink-jet recording head, wherein the ink-jet recording head has a silicone-containing film on a surface where a discharge port is provided, when a surface of the silicone-containing film etched in a thickness direction perpendicular to the surface of the silicone-containing film using C60+ with an accelerating voltage of 40 kV applied thereto is subjected to a composition analysis by a time of flight secondary ion mass spectrometry ToF-SIMS, a value of a ratio of an abundance of SiC3H9+ at an etching time of 30 s to an abundance of SiC3H9+ at an outermost surface (0 s) of the silicone-containing film is 0.70 or more, and a contact angle at the outermost surface of the silicone-containing film is 80° or more.

Abstract: The photosensitive resin composition comprising an alkylsiloxane-comprising resin (A) with specific structure, an alkylsiloxane-comprising resin (B) with specific structure, and a photopolymerization initiator, wherein a molar ratio A:B between the alkylsiloxane-comprising resin (A) and the alkylsiloxane-comprising resin (B) is from 3:1 to 1:3.

Abstract: A method for manufacturing a microstructure comprising cured products of photosensitive resin compositions, the method comprising: a step of forming at least two layers of the photosensitive resin compositions each comprising a photopolymerization initiator; a step of subjecting each of the formed at least two layers of the photosensitive resin compositions to patterning exposure; and a step of collectively developing the exposed at least two layers of the photosensitive resin compositions to obtain a microstructure, wherein in the at least two layers of the photosensitive resin compositions, 90% by mass or more of the photopolymerization initiators contained in at least one of the two adjacent layers of the photosensitive resin compositions is a nonionic photopolymerization initiator.

Abstract: A liquid ejection head includes a substrate, an ejection port forming member, and a channel forming member, in which the ejection port forming member and the channel forming member are provided on the substrate. The channel forming member is a cured substance of a photosensitive resin composition formed of a resin and a compound that contains a ligand having a lone electron pair, and is in contact with the substrate including an inorganic material layer on a surface thereof, and a content of the compound that contains a ligand having a lone electron pair is in a range of 1.0% by mass to 5.0% by mass with respect to 100% by mass of an epoxy resin contained in the photosensitive resin composition.

Abstract: A liquid discharge apparatus includes a substrate having a discharge port face provided with a discharge port for discharging a liquid, a member having a recessed portion for storing the substrate, a sealing material for sealing a gap between the recessed portion of the member and the substrate, a wiping member configured to wipe the discharge port face, and an application member configured to apply oil to the sealing material.

Abstract: A resin composition contains a cationically curable silicone resin. an epoxy resin. and an acrylic resin. in which the acrylic resin is constituted by an acrylic monomer having an oxygen equivalent of 100 or more.

Abstract: A micro pattern manufacturing method includes a first process for forming a photosensitive resin layer on a substrate, and a second process for exposing and developing the photosensitive resin layer to form a micro pattern, wherein the photosensitive resin layer is formed by using a photosensitive resin compound containing an epoxy resin, a fluorine compound, a photocationic polymerization initiator, and a solvent, and wherein a boiling or sublimation point of the fluorine compound is 200° C. or higher, the solvent contains an ester solvent, and a ratio of the ester solvent to the entire solvent is equal to or larger than 5% by mass.

Abstract: An ink jet recording head that includes a substrate having an ejection orifice for ejecting a liquid and a member provided with a recessed portion for accommodating the substrate, the head including a gap formed between a wall of the recessed portion of the member and the substrate, and a sealing material that seals the gap, in which the sealing material contains a cured product of a composition containing at least a hydrogenated bisphenol A type epoxy resin, a solid basic compound, and polythiol.

Abstract: Provided is a method for manufacturing a liquid ejection head including an ejection orifice for ejecting a liquid, a substrate and a flow path forming member that is joined to the substrate to form a liquid flow path communicating with the ejection orifice, the method including: (1) forming a resin layer having a flow path mold pattern, on the substrate; (2) adding a hydrophilizing material represented by Chemical Formula 1 to an entire surface layer of the resin layer; (3) forming a covering resin layer serving as the flow path forming member, on the resin layer and forming a compatible layer containing the resin layer, the covering resin layer and the hydrophilizing material, at an interface between the resin layer and the covering resin layer; (4) forming the ejection orifice by exposing the covering resin layer; and (5) forming a flow path by removing the resin layer.

Abstract: An inkjet recording head comprising a flow channel member, wherein the flow channel member is formed of a heat-cured product of a molding material comprising a resin composition comprising a thermosetting epoxy resin and a curing agent, and a filler; the filler comprises alumina and silica; and with d50 as a median diameter of the silica and with alumina A as the alumina having a median diameter of d50/4 or less, the content of the alumina A is 11 parts by mass or more relative to 100 parts by mass of the silica.

Abstract: A hydrophilic coating material including an alginate compound having a bond with a silane compound is used. The material is produced by reacting a water-soluble alginate compound and a silane compound and then by adding a divalent metal ion to an alginic acid-derived carboxyl group in the reaction product.

Abstract: A method for manufacturing a microstructure comprising cured products of photosensitive resin compositions, the method comprising: a step of forming at least two layers of the photosensitive resin compositions each comprising a photopolymerization initiator; a step of subjecting each of the formed at least two layers of the photosensitive resin compositions to patterning exposure; and a step of collectively developing the exposed at least two layers of the photosensitive resin compositions to obtain a microstructure, wherein in the at least two layers of the photosensitive resin compositions, 90% by mass or more of the photopolymerization initiators contained in at least one of the two adjacent layers of the photosensitive resin compositions is a nonionic photopolymerization initiator.

Abstract: Provided is a photosensitive structural body including: a substrate having a hydroxy group on a first surface thereof; and a cured product of a negative photosensitive resin composition arranged on the substrate, wherein the negative photosensitive resin composition contains an epoxy compound (A), a photobase generator (B), and an aromatic compound (C), and the aromatic compound (C) is a compound represented by the following general formula (1): in the general formula (1), four of R1 to R6 each independently represent a hydrogen atom or an alkyl group, and remaining two thereof each independently represent a functional group selected from an unsubstituted amino group (—NH2), a hydroxy group (—OH), and a carboxyl group (—COOH), provided that the two functional groups each selected from an unsubstituted amino group, a hydroxy group, and a carboxyl group are functional groups different from each other.

Abstract: A method for producing a shaped object, the method comprising: laminating a photosensitive resin composition on an inorganic material layer of a substrate having the inorganic material layer on a surface thereof; performing a patterned exposure of the photosensitive resin composition using an i-line; and curing a pattern-exposed portion and removing an unexposed portion to form a shaped object in which a cured product of the photosensitive resin composition is formed on the substrate, wherein the photosensitive resin composition comprises an epoxy resin, at least one cationic polymerization initiator with a molar extinction coefficient in an i-line of less than 500 L·mol?1·cm?1 and at least one sensitizer with a molar extinction coefficient in an i-line of 500 L·mol?1·cm?1 or more.

Abstract: A liquid ejection head includes a substrate having a liquid feeding port and an energy generating element, a substrate protective layer provided on the substrate, and a nozzle forming member provided on the substrate protective layer, and having an ejection port ejecting a liquid, and a liquid flow channel communicating with the liquid feeding port and the ejection port. The substrate protective layer comprises an ion scavenger.