Abstract: A sealant contains a dicyclopentadiene type epoxy resin represented by formula 1 below, a hydrogenated bisphenol A epoxy resin, and a photo-induced cationic polymerization initiator, in which the content of the dicyclopentadiene type epoxy resin is 15 to 40 parts by mass relative to 100 parts by mass of the total mass of epoxy resins contained in the sealant. where n represents an integer of 0 to 2.

Abstract: A liquid ejection head includes: a chip including a substrate having an energy generating element, an ejection orifice member, and an electrode terminal; an electric wiring board; a support member for supporting the wiring board, the support member having an opening surrounding the chip; a chip periphery sealing member which fills a gap between the chip and the opening; and an electrically connecting portion sealing member disposed in contact with the chip periphery sealing member and which covers an electrically connecting portion between the chip and the electric wiring board. The electrically connecting portion sealing member is a cured product of a material containing filler. The chip periphery sealing member is a cured product of a material containing at least one of specific siloxanes. The chip periphery sealing member and the electrically connecting portion sealing member has a difference in coefficient of linear expansion of 50 ppm/° C. or more.

Abstract: A sealing tape for an ink jet recording head, detachably adhered to the surface of a chip which is provided on an ink jet recording head and on which a discharge port for discharging ink is formed, includes: a base layer; and an adhesive layer on the base layer, the adhesive layer consisting of: (1) 70 to 100 wt % of (A)-(B)-(A) block copolymers which have no unsaturated carbon bond and consist of (a) vinyl aromatic compound units and (b) olefinic hydrocarbon units where (A) is a polymer block consisting of the (a) units and (B) is a polymer block consisting of the (b) units; and (2) 0 to 30 wt % of polyolefin, wherein the content of the (a) vinyl aromatic compound units in the (1) (A)-(B)-(A) block copolymers is 10 to 30 wt %.

Abstract: A liquid ejection head includes: a chip including a substrate having an energy generating element, an ejection orifice member, and an electrode terminal; an electric wiring board; a support member for supporting the wiring board, the support member having an opening surrounding the chip; a chip periphery sealing member which fills a gap between the chip and the opening; and an electrically connecting portion sealing member disposed in contact with the chip periphery sealing member and which covers an electrically connecting portion between the chip and the electric wiring board. The electrically connecting portion sealing member is a cured product of a material containing filler. The chip periphery sealing member is a cured product of a material containing at least one of specific siloxanes. The chip periphery sealing member and the electrically connecting portion sealing member has a difference in coefficient of linear expansion of 50 ppm/° C. or more.

Abstract: A liquid ejection head includes a chip having a liquid ejection pressure generating element and an electrode terminal for electrically connecting the liquid ejection pressure generating element to an external source, an electrical wiring board having a lead wiring to be electrically connected to the electrode terminal, and a lead sealing material for covering an electrical connection portion between the electrode terminal and the lead wiring. The lead sealing material contains an epoxy resin which has an average number of functional groups per molecule of more than two and is solid at 25° C., an acid anhydride curing agent having a polybutadiene backbone, a curing accelerator, and an inorganic filler.

Abstract: A liquid discharge head includes a substrate having, on one side thereof, energy generating elements for generating energy used for discharging liquid, and a sealing member arranged in contact with at least a part of one or more end faces of the substrate, the sealing member being a cured product of a composition having an epoxy resin having a butadiene skeleton and an epoxy resin curing agent having a butadiene skeleton.

Abstract: A seal tape for protecting an ejection orifice face in which an ejection orifice for ejecting ink is formed, comprising a substrate and an adhesive layer, wherein the adhesive layer comprises a crosslinked resin mixture comprising at least: (a) a polydimethylsiloxane resin of the formula (1) in content of from 60 to 90% by mass, wherein R1 and R2 each independently represent an alkyl radical or hydroxyl radical, and n represents an integer, and (b) an MQ resin composed of (R)3SiO1/2 units [M-units] wherein three substituents R bonded to Si each independently represent an alkyl or hydroxyl radical and SiO4/2 units [Q-units] in a content of 10 to 40% by mass, and wherein a probe tack measured value of the seal tape is from 0.3 to 1.6 N.

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 ink jet recording head has an array of ink ejection outlets in an ejection outlet forming surface, to which a protection tape is adhered during transportation. The ejection outlet forming surface has an outside area which is outside of each of opposite ends of the array with respect to a direction of the array, and the outside area has a peel resistance, provided by surface modification, which resistance is higher than in another portion of the ejection outlet forming surface.

Abstract: Provided is a liquid ejection head, comprising a chip having a liquid ejection pressure generating element and an electrode terminal for electrically connecting the liquid ejection pressure generating element to an outside, an electrical wiring board having a lead wiring to be electrically connected to the electrode terminal, and a lead sealing material for covering an electrical connection portion between the electrode terminal and the lead wiring. The lead sealing material contains an epoxy resin (a) which has an average number of functional groups per molecule of more than two and is solid at 25° C., an acid anhydride curing agent (b) having a polybutadiene backbone, a curing accelerator (c), and an inorganic filler (d).

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 discharge head includes a substrate having, on one side thereof, energy generating elements for generating energy used for discharging liquid, and a sealing member arranged in contact with at least a part of one or more end faces of the substrate, the sealing member being a cured product of a composition having an epoxy resin having a butadiene skeleton and an epoxy resin curing agent having a butadiene skeleton.

Abstract: A sealing tape for an ink jet recording head, detachably adhered to the surface of a chip which is provided on an ink jet recording head and on which a discharge port for discharging ink is formed, includes: a base layer; and an adhesive layer on the base layer, the adhesive layer consisting of: (1) 70 to 100 wt % of (A)-(B)-(A) block copolymers which have no unsaturated carbon bond and consist of (a) vinyl aromatic compound units and (b) olefinic hydrocarbon units where (A) is a polymer block consisting of the (a) units and (B) is a polymer block consisting of the (b) units; and (2) 0 to 30 wt % of polyolefin, wherein the content of the (a) vinyl aromatic compound units in the (1) (A)-(B)-(A) block copolymers is 10 to 30 wt %.

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 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 discharge head includes a discharge element substrate including an energy generating element that generates energy for discharging liquid, a discharge port provided so as to correspond to the energy generating element, and a supply path for supplying the liquid to the discharge port. The discharge element substrate has an open face to which the discharge port is open, a back face of the open face, and side faces formed between the open face and the back face, and at least a part of the side faces is sealed by a sealing agent, which contains a filler made of fluororesin.

Abstract: A method for producing an ink-jet recording head having a discharge port configured to discharge ink, a passage-forming member configured to form an ink passage communicating with the discharge port, and a substrate provided with an energy-generating element configured to generate energy utilized for discharging ink includes the steps of forming a pattern for the passage on the substrate, the pattern being composed of a positive photosensitive resin that is insensitive to light having a wavelength of 300 nm to 470 nm, forming a coating resin layer to be the passage-forming member on the substrate having the pattern, exposing the coating resin layer to only light having a wavelength of 300 nm or more to form the discharge port, and removing the pattern to form the passage.

Abstract: An ink jet recording head having an array of ink ejection outlets in an ejection outlet forming surface on which a protection tape is stuck in transportation, wherein the ejection outlet forming surface has an outside area which is outside of each of opposite ends of the array with respect to a direction of the array, and the outside area has a peel resistance, provided by surface modification, which resistance is higher than in another portion of the ejection outlet forming surface.

Abstract: A method for producing an ink-jet recording head having a discharge port configured to discharge ink, a passage-forming member configured to form an ink passage communicating with the discharge port, and a substrate provided with an energy-generating element configured to generate energy utilized for discharging ink includes the steps of forming a pattern for the passage on the substrate, the pattern being composed of a positive photosensitive resin that is insensitive to light having a wavelength of 300 nm to 470 nm, forming a coating resin layer to be the passage-forming member on the substrate having the pattern, exposing the coating resin layer to only light having a wavelength of 300 nm or more to form the discharge port, and removing the pattern to form the passage.

Abstract: A liquid discharge head includes a discharge element substrate including an energy generating element that generates energy for discharging liquid, a discharge port provided so as to correspond to the energy generating element, and a supply path for supplying the liquid to the discharge port, wherein the discharge element substrate has an open face to which the discharge port is open, a back face of the open face, and side faces formed between the open face and the back face, and at least a part of the side faces is sealed by a sealing agent, wherein the sealing agent contains filler made of fluororesin.