Abstract: A photosensitive negative resin composition containing a resin (a) having at least three cyclohexene oxide skeletons in its molecule, an onium salt (b) composed of a cation moiety structure represented by the formula b1 defined in the description and an anion moiety structure represented by the formula b2 defined in the description, a silane compound (c) and an organic solvent (d). A fine structure using the resin composition, a production process of the fine structure and a liquid ejection head.

Abstract: A photosensitive resin composition includes a cationically polymerizable compound, a photoacid generating agent having an anion portion and a cation portion, and a salt having a cation portion having either one of a quaternary ammonium structure and a quaternary phosphonium structure and an anion portion, wherein the anion portion of the salt is exchanged with the anion portion of a first acid derived from the anion portion of the photoacid generating agent to form a second acid having acid strength that is lower than acid strength of the first acid.

Abstract: A liquid discharge head has a substrate having an inorganic material layer, an organic material layer, and an intermediate layer contacting the inorganic material layer and the organic material layer between the inorganic material layer and the organic material layer, in which the intermediate layer contains a resin having three or more cyclohexene oxide skeletons in the molecules, a photocationic polymerization initiator, a thermal cationic polymerization initiator, and an onium salt containing a cation portion structure represented by (d1) and an anion portion structure represented by (d2).

Abstract: A liquid discharge head has a substrate having an inorganic material layer, an organic material layer, and an intermediate layer contacting the inorganic material layer and the organic material layer between the inorganic material layer and the organic material layer, in which the intermediate layer contains a resin having three or more cyclohexene oxide skeletons in the molecules, a photocationic polymerization initiator, a thermal cationic polymerization initiator, and an onium salt containing a cation portion structure represented by (d1) and an anion portion structure represented by (d2).

Abstract: A photosensitive resin composition includes (a) a compound polymerizable in the presence of an acid, and (b) a photoacid generating agent including an onium salt having a cationic part structure represented by formula (b1) below and an anionic part structure represented by formula (b2) below, wherein the component (b) absorbs 50% or more of the amount of 365 nm wavelength light absorbed by the photosensitive resin composition,

Abstract: The invention provides a photosensitive negative resin composition containing (a) an epoxy-group-containing compound, (b) a first onium salt containing a cation portion structure represented by (b1) and an anion portion structure represented by (b2), and (c) a second onium salt containing a cation portion structure represented by (c1) and an anion portion structure represented by (c2).

Abstract: A photosensitive resin composition includes: a cation polymerizable compound; a photoacid generator having an anion portion represented by the chemical formula 1 and a cation portion, wherein R represents a hydrocarbon group which may be substituted with a fluorine atom and has a total carbon number of 1 to 30; X is selected from the group consisting of a carbon atom and a phosphorous atom; Y is selected from the group consisting of —S(?O)2—, —O—CF2—, —C(?O)—CF2—, —O—C(?O)—CF2—, —C(?O)—O—CF2—, and a single bond; R has at least one fluorine atom when Y is —S(?O)2— or the single bond; m and n are integers selected from the group consisting of m+n=3 and n=0, 1, and 2 when X is the carbon atom; m and n are integers selected from the group consisting of m+n=6 and n=0 to 5 when X is the phosphorous atom; and R and Y may be different from each other when m is equal to or greater than 2; and a salt of an anion portion and a cation portion, wherein an acid strength of an acid derived from the anion portion is equa

Abstract: A photosensitive negative resin composition containing a resin (a) having at least three cyclohexene oxide skeletons in its molecule, an onium salt (b) composed of a cation moiety structure represented by the formula b1 defined in the description and an anion moiety structure represented by the formula b2 defined in the description, a silane compound (c) and an organic solvent (d). A fine structure using the resin composition, a production process of the fine structure and a liquid ejection head.

Abstract: A liquid ejection head includes a housing having a first outer surface; a liquid ejection substrate disposed at a first portion of the first outer surface and having ejection ports for ejecting liquid; and a wiring member disposed on a second portion of the first outer surface so as to be next to the liquid ejection substrate and electrically connected to the liquid ejection substrate. The ejection ports are covered by a cap that is in contact with the wiring member and a portion, except the second portion, of the first outer surface around the liquid ejection substrate; and the second portion is recessed relative to the portion, except the second portion, of the first outer surface around the liquid ejection substrate.

Abstract: The invention provides a photosensitive negative resin composition containing (a) an epoxy-group-containing compound, (b) a first onium salt containing a cation portion structure represented by (b1) and an anion portion structure represented by (b2), and (c) a second onium salt containing a cation portion structure represented by (c1) and an anion portion structure represented by (c2).

Abstract: A photosensitive resin composition includes a cationically polymerizable compound, a photoacid generating agent having an anion portion and a cation portion, and a salt having a cation portion having either one of a quaternary ammonium structure and a quaternary phosphonium structure and an anion portion, wherein the anion portion of the salt is exchanged with the anion portion of a first acid derived from the anion portion of the photoacid generating agent to form a second acid having acid strength that is lower than acid strength of the first acid.

Abstract: A photosensitive resin composition includes (a) a compound polymerizable in the presence of an acid, and (b) a photoacid generating agent including an onium salt having a cationic part structure represented by formula (b1) below and an anionic part structure represented by formula (b2) below, wherein the component (b) absorbs 50% or more of the amount of 365 nm wavelength light absorbed by the photosensitive resin composition,

Abstract: A photosensitive resin composition includes: a cation polymerizable compound; a photoacid generator having an anion portion represented by the formula 1 and a cation portion, wherein R represents a hydrocarbon group which may be substituted with a fluorine atom and has a total carbon number of 1 to 30; X is selected from the group consisting of a carbon atom and a phosphorous atom; Y is selected from the group consisting of —S(?O)2—, —O—CF2—, —C(?O)—CF2—, —O—C(?O)—CF2—, —C(?O)—O—CF2—, and a single bond; R has at least one fluorine atom when Y is —S(?O)2— or the single bond; m and n are integers selected from the group consisting of m+n=3 and n=0, 1, and 2 when X is the carbon atom; m and n are integers selected from the group consisting of m+n=6 and n=0 to 5 when X is the phosphorous atom; and R and Y may be different from each other when m is equal to or greater than 2; and a salt of an anion portion and a cation portion, wherein an acid strength of an acid derived from the anion portion is equal to or g

Abstract: An ink jet recording head comprising a discharge port for discharging an ink; and a sealing tape for sealing the discharge port; wherein the sealing tape includes a pressure-sensitive adhesive layer constituted of an acrylic crosslinked polymer formed by crosslinking an alkyl(meth)acrylate ester copolymer with a metal chelate compound, and is peelably adhered, through the pressure-sensitive adhesive layer, to a part where the discharge port is formed.

Abstract: An aspect of the present invention is a process for producing a liquid ejection head including an ejection orifice member provided with ejection orifices for ejecting liquid. The process includes supplying to a surface of a base material for forming the ejection orifice member a mixture of a first composite for imparting a hydrophobic characteristic to the surface and a second composite being able to exhibit a hydrophilic characteristic by being irradiated with light; imparting a hydrophobic characteristic to the entire or a part of the surface by utilizing the first composite; and then irradiating the second composite with light in a partial region of the surface for imparting a hydrophilic characteristic to the region irradiated with the light.

Abstract: An ink jet head has a head substrate including discharge elements for discharging ink, with an electric wiring board being electrically connected to the head substrate, in which the periphery of the head substrate is sealed with a first sealant, and an electric splice between the head substrate and the electric wiring board is sealed with a second sealant. The first and second sealants contain the same base resin and curing agent, and the second sealant shows higher hardness than the first sealant after curing. This ink jet head is free from problems such as cavities and fissures at the boundary of the two sealants caused by a difference in linear expansion coefficients.

Abstract: An ink jet ink reservoir having a part of its members formed of a polyolefin resin is provided which is free from printing defects caused by filter clogging attributable to a compound derived from an antioxidant. An ink jet ink reservoir used in an ink jet recording apparatus, wherein a part of constituent members of the ink jet ink reservoir is formed of a polyolefin resin, wherein the polyolefin resin contains as additive an antioxidant at least with a hindered phenol skeleton and a phosphorus antioxidant more hydrophobic than bis(2,6-di-t-butylphenyl) pentaerythritol diphosphite (denoted by P-6). The members are free from a phosphorus antioxidant having hydrophobicity equal to or lower than the above P-6.

Abstract: A manufacturing method of a liquid discharge head having a liquid flow path which communicates with a discharge port for discharging liquid, includes: providing a first layer made of a first photosensitive resin on a substrate; forming a mold of the flow path from the first layer by exposing a part of the first layer and developing the first layer; applying a light absorbent to a surface of the mold; providing a second layer made of a second photosensitive resin to coat the mold applied with the light absorbent; forming an opening that is to be the discharge port in the second layer by exposing a part of the second layer with light having a wavelength that can be absorbed by the light absorbent and developing the second layer; and forming the flow path by removing the mold.

Abstract: An ink jet head has a head substrate including discharge elements for discharging ink, with an electric wiring board being electrically connected to the head substrate, in which the periphery of the head substrate is sealed with a first sealant, and an electric splice between the head substrate and the electric wiring board is sealed with a second sealant. The first and second sealants contain the same base resin and curing agent, and the second sealant shows higher hardness than the first sealant after curing. This ink jet head is free from problems such as cavities and fissures at the boundary of the two sealants caused by a difference in linear expansion coefficients.

Abstract: A liquid ejection head includes a housing having a first outer surface; a liquid ejection substrate disposed at a first portion of the first outer surface and having ejection ports for ejecting liquid; and a wiring member disposed on a second portion of the first outer surface so as to be next to the liquid ejection substrate and electrically connected to the liquid ejection substrate. The ejection ports are covered by a cap that is in contact with the wiring member and a portion, except the second portion, of the first outer surface around the liquid ejection substrate; and the second portion is recessed relative to the portion, except the second portion, of the first outer surface around the liquid ejection substrate.