A photocurable composition including an acrylic resin, an epoxy group-containing compound excluding a component corresponding to the acrylic resin, and a cationic polymerization initiator. The acrylic resin has a glass transition point of 0 C. or lower and has a constitutional unit derived from an epoxy group-containing acrylic monomer. A content proportion of the constitutional unit in a total amount of all constitutional units constituting the acrylic resin is greater than 0% by mass and less than 50% by mass.

This photosensitive resin composition includes: (A) a photopolymerizable compound including at least one of a photopolymerizable monomer and a photopolymerizable oligomer; (B) titanium dioxide; and (C) a photopolymerization initiator. The component (C) includes (C1) an acylphosphine oxide-containing photopolymerization initiator and (C2) a phenylglyoxylic acid-containing photopolymerization initiator.

Microcapsules including a polymeric shell and an internal phase including a non-photopolymerizable reactive diluent are provided for use in microcapsule imaging sheets. Imaging sheets including microcapsules which include a non-photopolymerizable reactive diluent, and which exhibit improvements in color development (Dmax), discoloration (yellowing) resistance, mechanical properties (e.g., peel strength), and temperature latitude of imaging sheets including leuco dyes.

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.

Microcapsules including a polymeric shell and an internal phase including a non-photopolymerizable reactive diluent are provided for use in microcapsule imaging sheets. Imaging sheets including microcapsules which include a non-photopolymerizable reactive diluent, and which exhibit improvements in color development (Dmax), discoloration (yellowing) resistance, mechanical properties (e.g., peel strength), and temperature latitude of imaging sheets including leuco dyes.

A negative photosensitive resin composition containing an epoxy group-containing resin and a cationic polymerization initiator which includes a sulfonium salt represented by General Formula (I0). In Formula (I0), R1 and R2 represent an aryl group, a heterocyclic hydrocarbon group, or an alkyl group. R3 to R5 are an alkyl group, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, a hydroxy(poly)alkyleneoxy group, or a halogen atom. k is an integer of 0 to 4, m is an integer of 0 to 3, and n is an integer of 1 to 4. A is a group represented by S, O, SO, SO.sub.2, or CO X.sup. represents a monovalent polyatomic anion. ##STR00001##

A matte-like cured coating film of a curable resin composition is provided on a substrate such as a wiring board, in which scratches are unnoticeable. The cured coating film satisfies Gs (20)5 and Gs (85)35 and has a ratio R represented by the formula R={Gs (85)/Gs (60}/{Gs (60)/Gs (20)} ranging from 0.35 to 4.0, where Gs (20), Gs (60), and Gs (85) are 20 gloss, 60 gloss, and 85 gloss on a surface of the cured coating film measured according to JIS Z 8741-1997, respectively.

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.