Abstract: An optical fiber ribbon comprises a plurality of optical fibers arranged in parallel and a connecting resin layer containing a ribbon resin for coating and connecting the plurality of optical fibers, wherein each of the plurality of optical fibers has an outer diameter of 220 ?m or less; and the ribbon resin contains a cured product of urethane (meth)acrylate, and an amount of silicon is 5 ppm or more and 80000 ppm or less and an amount of tin is 5 ppm or more and 30000 ppm or less at the surface of the connecting resin layer.

Abstract: The optical fiber comprises a glass fiber comprising a core and a cladding, a primary resin layer in contact with the glass fiber and covering the glass fiber, and a secondary resin layer covering the primary resin layer, wherein the primary resin layer contains a cured product of a resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and an aromatic acid compound, a content of the aromatic acid compound is 20 ppm or more and 12000 ppm or less based on a total amount of the resin composition, and Young's modulus of the primary resin layer is 0.6 MPa or less at 23° C.±2° C.

Abstract: The resin composition according to an aspect of the present disclosure is a resin composition containing a photopolymerizable compound comprising urethane (meth)acrylate and a polyrotaxane, and a photopolymerization initiator, and the content of the polyrotaxane is 0.05% by mass or more and 11% by mass or less based on the total amount of the photopolymerizable compound.

Abstract: A resin composition for primary coating of an optical fiber contains a photopolymerizable compound, a photopolymerization initiator, and a silane coupling agent, wherein the photopolymerizable compound contains a urethane (meth)acrylate and an ultraviolet curable polyrotaxane, and the content of the polyrotaxane is 0.05% by mass or more and 11% by mass or less based on the total amount of the photopolymerizable compound.

Abstract: An optical fiber ribbon includes a plurality of optical fibers arranged in parallel in a direction orthogonal to a longitudinal direction of the optical fibers, and a collective coating covering outer peripheries of the plurality of optical fibers. The collective coating includes a connected portion at which the optical fibers adjacent to each other are connected in at least a part of the plurality of optical fibers. An outer diameter of each of the plurality of optical fibers is 215 ?m or less, and a dynamic friction force of the collective coating is 0.3 N or less.

Abstract: An optical fiber ribbon includes optical fibers arranged in parallel in a direction orthogonal to a longitudinal direction of the optical fibers, and a collective coating layer covering an outer periphery of each of the plurality of optical fibers. The collective coating layer includes a connected portion at which the optical fibers adjacent to each other are connected. An outer diameter of each of the plurality of optical fibers is 215 ?m or less. In a cross-sectional view of each of the optical fibers, the collective coating layer includes a thick portion and at least two thin portions. A difference between the thickness of the collective coating layer in the thick portion and the thickness of the collective coating layer in the thin portion is 5 ?m or more and 19 ?m or less.

Abstract: An optical fiber ribbon comprises a plurality of optical fibers arranged in parallel and a connecting resin layer containing a ribbon resin for coating and connecting the plurality of optical fibers, wherein each of the plurality of optical fibers has an outer diameter of 220 ?m or less; each of the plurality of optical fibers includes a glass fiber, a primary resin layer, and a colored secondary resin layer; the colored secondary resin layer contains a cured product of a resin composition containing 2,4,6-trimethylbenzoyldiphenylphosphine oxide; and a content of phosphorus in the colored secondary resin layer is 0.03 mass % or more and 0.30 mass % or less, and an amount of a phosphorus-tin complex at the surface of the colored secondary resin layer is 300 ppm or more and 7000 ppm or less.

Abstract: The present disclosure relates to a resin composition for coating an optical fiber, the resin composition including: a base resin that contains an oligomer, a monomer, and a photopolymerization initiator; and inorganic oxide particles, in which the inorganic oxide particles include a plurality of particle groups having different volume average particle sizes, and the volume average particle size is measured by small-angle X-ray scattering.

Abstract: An optical fiber cable provided with a plurality of optical fiber cores and a sheath coating the periphery of the plurality of optical fiber cores. The number of optical fiber cores per unit area of the optical fiber cable in a cross-section of the optical fiber cable perpendicular to the longitudinal direction is larger than 6.3 cores/mm2 and smaller than or equal to 12.6 cores/mm2. The optical fiber cores each have an outer diameter of 175-185 ?m inclusive.

Abstract: An optical fiber ribbon comprises a plurality of optical fibers arranged in parallel and a connecting resin layer containing a ribbon resin for coating and connecting the plurality of optical fibers, wherein each of the plurality of optical fibers has an outer diameter of 220 ?m or less; and the ribbon resin contains a cured product of urethane (meth)acrylate, and an amount of silicon is 5 ppm or more and 80000 ppm or less and an amount of tin is 5 ppm or more and 30000 ppm or less at the surface of the connecting resin layer.

Abstract: An optical fiber ribbon comprises a plurality of optical fibers arranged in parallel and a connecting resin layer containing a ribbon resin for coating and connecting the plurality of optical fibers, wherein each of the plurality of optical fibers has an outer diameter of 220 µm or less; each of the plurality of optical fibers includes a glass fiber, a primary resin layer, and a colored secondary resin layer; the colored secondary resin layer contains a cured product of a resin composition containing 2,4,6-trimethylbenzoyldiphenylphosphine oxide; and a content of phosphorus in the colored secondary resin layer is 0.03 mass% or more and 0.30 mass% or less, and an amount of a phosphorus-tin complex at the surface of the colored secondary resin layer is 300 ppm or more and 7000 ppm or less.

Abstract: An optical fiber comprises a glass fiber comprising a core and a cladding, and a coating resin layer, wherein the coating resin layer has a primary resin layer being in contact with the glass fiber and coating the glass fiber, and a secondary resin layer coating the primary resin layer, and the primary resin layer and the secondary resin layer are resin layers containing inorganic oxide particles.

Abstract: An optical fiber comprises a glass fiber comprising a core and a cladding, and a coating resin layer covering the outer periphery of the glass fiber, wherein the coating resin layer has a primary resin layer being in contact with the glass fiber and covering the glass fiber and a secondary resin layer covering the outer periphery of the primary resin layer, the secondary resin layer comprises hydrophobic spherical silica particles, and the content of the silica particles is 7% by mass or more and 60% by mass or less based on the total amount of the secondary resin layer, and the absolute value of the surface potential of the optical fiber is 10 mV or more and 60 mV or less.

Abstract: A method for manufacturing an optical fiber includes: a coating step of forming a first layer by applying a first ultraviolet ray curable resin composition onto a glass fiber, and then, of forming a second layer by applying a second ultraviolet ray curable resin composition onto the first layer; a first irradiation step of curing the first layer and the second layer by irradiating the first layer and the second layer with an ultraviolet ray, and of obtaining the optical fiber including a primary resin layer and a secondary resin layer; and a second irradiation step of irradiating the optical fiber with an ultraviolet ray at an illuminance of less than or equal to one tenth of an illuminance in the first irradiation step for an irradiation time of longer than or equal to 10 times an irradiation time in the first irradiation step.

Abstract: A method for manufacturing an optical fiber is a method for manufacturing an optical fiber including a glass fiber, and a coating resin layer that coats the glass fiber by being in contact with the glass fiber. The method includes a step of increasing a dissolved oxygen concentration in an ultraviolet ray curable resin composition, a step of applying the ultraviolet ray curable resin composition, in which the dissolved oxygen concentration is increased, onto the glass fiber, and a step of curing the ultraviolet ray curable resin composition by irradiating the ultraviolet ray curable resin composition that is applied onto the glass fiber with an ultraviolet ray.

Abstract: Provided is an intermittently coupled-type optical fiber ribbon in which, in a state where a plurality of optical fibers are arranged in parallel, coupling portions at which adjacent optical fibers are coupled by a coupling resin and non-coupling portions at which the adjacent optical fibers are not coupled are intermittently provided in a longitudinal direction, the coupling portions and the on-coupling portions being provided between some or all of the plurality of optical fibers, in which at least some of the non-coupling portions include a convex portion of the coupling resin, a tip end of the convex portion having an acute angle in a cross-sectional view in a direction orthogonal to the longitudinal direction.

Abstract: This optical fiber tape core wire (1) has: a plurality of optical fiber core wires (11) that are arranged in parallel to each other; a connection resin (21) that connects the plurality of optical fiber core wires (11); and a bridge part (21a) that is formed of the connection resin (21). The plurality of optical fiber core wires (11) are arranged in a state in which a side surface of an optical fiber core wire (11) is separated from or in contact with a side surface of another adjacent optical fiber core wire (11), the bridge part (21a) is provided between the optical fiber core wires (11) arranged in the separated state, the outer diameter of the optical fiber core wire (11) is 220 ?m or less, and the average distance between the centers of the plurality of optical fiber core wires (11) is 220-280 ?m.

Abstract: An optical fiber comprises a glass fiber; a primary resin layer coating an outer periphery of the glass fiber; and a secondary resin layer coating an outer periphery of the primary resin layer, and a pH of the primary resin layer is greater than a pH of the secondary resin layer.

Abstract: Provided is an intermittently coupled-type optical fiber ribbon in which, in a state where a plurality of optical fibers are arranged in parallel, coupling portions at which adjacent optical fibers are coupled by a coupling resin and non-coupling portions at which the adjacent optical fibers are not coupled are intermittently provided in a longitudinal direction, the coupling portions and the on-coupling portions being provided between some or all of the plurality of optical fibers, in which at least some of the non-coupling portions include a convex portion of the coupling resin, a tip end of the convex portion having an acute angle in a cross-sectional view in a direction orthogonal to the longitudinal direction.

Abstract: A resin composition for coating an optical fiber is a resin composition comprising: a base resin containing an oligomer comprising urethane (meth)acrylate, a monomer, and a photopolymerization initiator; and hydrophobic zirconium oxide, wherein the content of the zirconium oxide is 0.5% by mass or more and 65% by mass or less based on the total amount of the resin composition.