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 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 method for manufacturing a resin composition includes a heating step of heating a mixture containing an epoxy resin and a sulfonium salt, wherein the sulfonium salt has a structure denoted by General formula (1) and a cation portion having a molecular weight of 500 or more: (each of R1 to R3 represents a hydrogen atom, a halogen atom, an alkyl, alkylthio, alkylcarbonyl, alkylsulfonyl, alkoxy, alkoxycarbonyl, aryl, arylcarbonyl, aryloxycarboaryl, aryloxy, arylthio, arylsulfinyl, hydroxy, hydroxy(poly)alkyleneoxy, acyloxy, cyano, nitro, heterocyclic hydrocarbon, silyl that may have a substituent, or amino group, R1 to R3 may be the same or differ from each other, and two or more of R1 to R3 may form a ring structure having an element S with each other directly or through —O—, —S—, —SO—, SO2—, —NH—, —CO—, —COO—, —CONH—, an alkylene group, or a phenylene group).

Abstract: A liquid ejection head includes a recording element substrate configured to eject a liquid, a supporting member configured to support the recording element substrate and including a supply channel configured to supply a liquid to the recording element substrate, and a channel member configured to supply a liquid to the supply channel, wherein at least one bonding surface between two of the recording element substrate, the supporting member, and the channel member is made of an epoxy resin composition containing an epoxy resin mixture and a powder curing agent, the epoxy resin mixture contains an epoxy resin that is liquid at normal temperature and a coumarone resin that is dissolvable in the epoxy resin, a weight average molecular weight of the epoxy resin mixture is 300 or more and 600 or less, and the liquid ejection head contains a cured substance of an adhesive agent containing the epoxy resin composition.

Abstract: Provided is a method of producing a microstructure including: forming a first resin layer formed of a photosensitive resin composition (1) on a substrate, followed by pattern exposure; and laminating a second resin layer formed of a photosensitive resin composition (2) on the first resin layer having been subjected to the pattern exposure, followed by pattern exposure, wherein the photosensitive resin composition (1) and the photosensitive resin composition (2) each contain an epoxy resin and a photoacid generator, wherein at least one of the photosensitive resin composition (1) or the photosensitive resin composition (2) further contains a coumarone resin, and wherein a content of the coumarone resin is less than 30 parts by mass with respect to 100 parts by mass of a content of each of the epoxy resin of the photosensitive resin composition (1) and the epoxy resin of the photosensitive resin composition (2).

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: 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.

Abstract: A photosensitive resin composition comprising: (a) an epoxy resin, (b) a cationic polymerization initiator, (c) an anthracene derivative, and (d) an organic solvent having a carbonyl group, wherein the anthracene derivative (c) comprises at least one selected from the group consisting of compounds represented by a following formula (1) (In the formula (1), R1 and R2 each independently represents an alkyl group having 4 or more carbon atoms or an aryl group having 6 to 10 carbon atoms, R3 and R4 each independently represents an alkyl group, an alkoxy group having 4 or more carbon atoms, an amino group, an alkylamino group, an alkylsulfonyl group, or a halogen atom, and m and n each independently represents an integer of 0 to 4).

Abstract: A liquid discharge head including: a substrate having a liquid supply port; a flow channel forming member that is provided on the substrate and has discharge ports for discharging a liquid and a liquid flow channel that makes the liquid supply port and the discharge ports communicate with each other; and a support member that is provided on the substrate and arranged to be in contact with at least one surface of the flow channel forming member, with the one surface not being in contact with the liquid, wherein the flow channel forming member includes a cured product of a first photosensitive resin composition including a photosensitive resin, the support member includes a cured product of a second photosensitive resin composition including the epoxy resin A having a structure represented by formula (a1) or (a2) below in main chain structure: where, n1 and n2 represent integers of at least 2.

Abstract: A liquid discharge head comprising a substrate comprising a liquid feeding port and an energy generating element for liquid discharge, and a flow channel member comprising, on the substrate, a discharge port through which a liquid is discharged and a liquid flow channel communicating with both the liquid feeding port and the discharge port, wherein the flow channel member comprises a flow channel member (1) not comprising a surface in contact with the liquid and a flow channel member (2) comprising a surface in contact with the liquid, a film stress S1 and S2 of the flow channel members (1) and (2), respectively, satisfy S1<S2, a film thickness L1 and L2 of the flow channel member (1) and (2), respectively, in a direction perpendicular to the substrate, satisfy L1<L2, and satisfying 470 MPa·?m<[L1×S1+(L2?L1)×S2]<1200 MPa·?m.

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: A liquid discharge head is provided which has a substrate, a flow channel forming member provided on a substrate surface of the substrate and forming a flow channel of a liquid, and a discharge port forming member provided on the flow channel forming member and having a discharge port through which a liquid is discharged, wherein the discharge port forming member and the flow channel forming member are formed of materials different from each other, a thickness of the flow channel forming member is greater than a thickness of the discharge port forming member in a direction perpendicular to the substrate surface, the discharge port forming member is a cured product of a photosensitive resin composition, and the flow channel forming member contains at least one resin selected from the group consisting of a polyether amide resin, a polyether imide resin and a polyether amide-imide resin.

Abstract: A hydrophilic coating material including an alginic acid compound and a resin, in which the alginic acid compound is granulated and dispersed in the resin. In a coating film using the material, it is preferred that the granulated alginic acid compound is exposed on the surface. Such a hydrophilic coating film is suitable as a hydrophilization treatment film of a nozzle face surface of an inkjet recording head.

Abstract: A microstructure including a minute structural part is manufactured by transferring a laminate including a photosensitive resin composition onto a substrate having an opening and patterning the laminate. The laminate includes a first layer that includes a first resin composition and a second layer that includes a second resin composition, each of the first and second resin compositions being a negative type photosensitive resin composition including a cationically polymerizable compound having an epoxy group. The laminate is transferred such that the second layer faces the substrate. The first resin composition is in a liquid state and the second resin composition is in a liquid state in the course of transferring the laminate.

Abstract: A liquid discharge head including: a substrate having a liquid supply port; a flow channel forming member that is provided on the substrate and has discharge ports for discharging a liquid and a liquid flow channel that makes the liquid supply port and the discharge ports communicate with each other; and a support member that is provided on the substrate and arranged to be in contact with at least one surface of the flow channel forming member, with the one surface not being in contact with the liquid, wherein the flow channel forming member includes a cured product of a first photosensitive resin composition including a photosensitive resin, the support member includes a cured product of a second photosensitive resin composition including the epoxy resin A having a structure represented by formula (a1) or (a2) below in main chain structure: where, n1 and n2 represent integers of at least 2.