WO2024219126A1 - 光ファイバおよび光ファイバリボン - Google Patents

光ファイバおよび光ファイバリボン Download PDF

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Publication number
WO2024219126A1
WO2024219126A1 PCT/JP2024/010302 JP2024010302W WO2024219126A1 WO 2024219126 A1 WO2024219126 A1 WO 2024219126A1 JP 2024010302 W JP2024010302 W JP 2024010302W WO 2024219126 A1 WO2024219126 A1 WO 2024219126A1
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Prior art keywords
resin layer
meth
mass
less
acrylate
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PCT/JP2024/010302
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English (en)
French (fr)
Japanese (ja)
Inventor
未歩 池川
矩章 岩口
勝史 浜窪
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to CN202480026266.5A priority Critical patent/CN121057972A/zh
Priority to JP2025515096A priority patent/JPWO2024219126A1/ja
Publication of WO2024219126A1 publication Critical patent/WO2024219126A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/104—Coating to obtain optical fibres
    • C03C25/1065—Multiple coatings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/24—Coatings containing organic materials
    • C03C25/26—Macromolecular compounds or prepolymers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/24—Coatings containing organic materials
    • C03C25/26—Macromolecular compounds or prepolymers
    • C03C25/28—Macromolecular compounds or prepolymers obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C03C25/285—Acrylic resins
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/465—Coatings containing composite materials
    • C03C25/47—Coatings containing composite materials containing particles, fibres or flakes, e.g. in a continuous phase
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/48—Coating with two or more coatings having different compositions
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables

Definitions

  • optical fibers have a coating resin layer to protect the glass fiber that transmits light.
  • the coating resin layer has, for example, a primary resin layer and a secondary resin layer.
  • the outermost layer of the coating resin layer is composed of a colored resin layer for identifying the optical fiber (see, for example, Patent Documents 1 and 2).
  • the optical fiber according to one embodiment of the present disclosure comprises a glass fiber including a core and a cladding, a primary resin layer that contacts the glass fiber and covers the glass fiber, a secondary resin layer that covers the primary resin layer, and a colored resin layer that covers the secondary resin layer, the colored resin layer contains a cured product of a resin composition that contains a photopolymerizable compound, a photopolymerization initiator, a polydimethylsiloxane compound, and titanium oxide particles, the number of titanium-containing particles with a diameter of 5 ⁇ m or more contained in the colored resin layer is less than 15 particles/mm in the length direction of the colored resin layer, and the amount of silicon on the surface of the colored resin layer is 0.9 at% or more and 11 at% or less.
  • FIG. 1 is a schematic cross-sectional view showing an example of an optical fiber.
  • FIG. 2 is a schematic cross-sectional view showing an example of an optical fiber ribbon.
  • the optical fibers used in optical cables have become thinner as the number of cores in the cables increases and the diameter of the optical fibers becomes smaller.
  • the coating resin layer for protecting the glass fiber also becomes thinner, which may cause the optical fiber to have poor lateral pressure resistance.
  • the coating resin layer may peel off from the glass fiber, causing an increase in transmission loss.
  • the objective of this disclosure is to provide an optical fiber and optical fiber ribbon that have excellent lateral pressure resistance and hot water resistance.
  • An optical fiber according to one embodiment of the present disclosure comprises a glass fiber including a core and a cladding, a primary resin layer in contact with and coating the glass fiber, a secondary resin layer coating the primary resin layer, and a colored resin layer coating the secondary resin layer, wherein the colored resin layer contains a cured product of a resin composition containing a photopolymerizable compound, a photopolymerization initiator, a polydimethylsiloxane compound, and titanium oxide particles, the number of titanium-containing particles having a diameter of 5 ⁇ m or more contained in the colored resin layer is less than 15 particles/mm in the longitudinal direction of the colored resin layer, and the amount of silicon on the surface of the colored resin layer is 0.9 at % or more and 11 at % or less.
  • Such optical fiber has excellent lateral pressure resistance and hot water resistance because the number of titanium-containing particles with a diameter of 5 ⁇ m or more is less than 15/mm in the longitudinal direction and the amount of silicon on the surface is 0.9 at% or more and 11 at% or less.
  • the content of the titanium oxide particles may be 0.6% by mass or more and 20.0% by mass or less based on the total amount of the resin composition.
  • the polydimethylsiloxane compound may have at least one organic group selected from the group consisting of a (meth)acryloyl group, an epoxy group, and a polyether group.
  • the amount of silicon atoms contained in the polydimethylsiloxane compound may be 6% by mass or more and 40% by mass or less, from the viewpoint of lateral pressure resistance characteristics and stability of the resin composition.
  • the outer diameter of the optical fiber may be 140 ⁇ m or more and 255 ⁇ m or less from the viewpoint of reducing the diameter of the optical fiber.
  • An optical fiber ribbon according to one aspect of the present disclosure includes a plurality of optical fibers described in any one of (1) to (5) above arranged in parallel and coated with a ribbon resin. Such an optical fiber ribbon has excellent lateral pressure resistance and hot water resistance.
  • the optical fiber according to the present embodiment includes a glass fiber including a core and a cladding, a primary resin layer that contacts the glass fiber and covers the glass fiber, a secondary resin layer that covers the primary resin layer, and a colored resin layer that covers the secondary resin layer.
  • the colored resin layer includes a cured product of a resin composition (hereinafter also referred to as a "resin composition for the colored resin layer") that contains a photopolymerizable compound, a photopolymerization initiator, a polydimethylsiloxane compound, and titanium oxide particles.
  • a polydimethylsiloxane compound is a compound having, as a repeating unit, a dimethylsiloxane skeleton (-Si(CH 3 ) 2 O-) consisting of two methyl groups bonded to silicon atoms and an oxygen atom in the main chain.
  • the amount of silicon atoms (Si) contained in the polydimethylsiloxane compound may be 6 mass% or more, 8 mass% or more, 10 mass% or more, or 12 mass% or more from the viewpoint of further improving the lateral pressure resistance property.
  • the amount of Si may be 40 mass% or less, 30 mass% or less, 25 mass% or less, or 21 mass% or less from the viewpoint of improving the stability of the resin composition.
  • the amount of Si may be 6 mass% or more and 40 mass% or less, 8 mass% or more and 30 mass% or less, 10 mass% or more and 25 mass% or less, or 12 mass% or more and 21 mass% or less from the viewpoint of the lateral pressure resistance property and the stability of the resin composition.
  • the amount of Si contained in the polydimethylsiloxane compound can be measured by inductively coupled plasma optical emission spectroscopy (ICP-OES) of the polydimethylsiloxane compound.
  • ICP-OES inductively coupled plasma optical emission spectroscopy
  • the polydimethylsiloxane compound may have at least one organic group selected from the group consisting of a (meth)acryloyl group, an epoxy group, and a polyether group, from the viewpoint of further improving the lateral pressure resistance and hot water resistance. That is, the polydimethylsiloxane compound may contain at least one selected from the group consisting of a polydimethylsiloxane compound having a (meth)acryloyl group, a polydimethylsiloxane compound having an epoxy group, and a polydimethylsiloxane compound having a polyether group, from the viewpoint of further improving the lateral pressure resistance and hot water resistance.
  • the polydimethylsiloxane compound may have these organic groups on the side chain or at the end.
  • these organic groups from the viewpoint of the lateral pressure resistance and hot water resistance, the (meth)acryloyl group and the epoxy group are preferred, and the (meth)acryloyl group is more preferred.
  • Polydimethylsiloxane compounds having (meth)acryloyl groups can be copolymerized with photopolymerizable compounds described below. Polydimethylsiloxane compounds having (meth)acryloyl groups are not included in the photopolymerizable compounds described below.
  • the number of (meth)acryloyl groups in the polydimethylsiloxane compound may be 1 or more, 2 or more, and 10 or less, or 8 or less.
  • the number of epoxy groups in the polydimethylsiloxane compound may be 1 or more, or 2 or more, and may be 10 or less, or 8 or less.
  • the number of polyether groups contained in the polydimethylsiloxane compound may be 1 or more, or 2 or more, and may be 10 or less, or 8 or less.
  • the content of the polydimethylsiloxane compound may be 0.3 mass% or more and 4.5 mass% or less based on the total amount of the resin composition. If the content of the polydimethylsiloxane compound is 0.3 mass% or more, the dispersibility of the titanium oxide particles contained in the resin composition is easily improved, so that it is possible to reduce aggregates with a diameter of 5 ⁇ m or more caused by the titanium oxide particles, and thus it is possible to reduce the unevenness of the surface of the formed colored resin layer and reduce the frictional force of the colored resin layer, thereby further improving the lateral pressure resistance of the optical fiber. If the content of the polydimethylsiloxane compound is 4.5 mass% or less, it is possible to suppress the reduction in the adhesion force between the colored resin layer and the secondary resin layer, and further improve the hot water resistance.
  • the content of the polydimethylsiloxane compound may be 0.4 mass% or more or 0.5 mass% or more based on the total amount of the resin composition, and from the viewpoint of further improving the hot water resistance, the content of the polydimethylsiloxane compound may be 4.0 mass% or less, 3.5 mass% or less, 3.0 mass% or less, or 2.5 mass% or less based on the total amount of the resin composition.
  • the content of the polydimethylsiloxane compound may be 0.4 mass% or more and 4.0 mass% or less, 0.4 mass% or more and 3.5 mass% or less, 0.5 mass% or more and 3.0 mass% or less, or 0.5 mass% or more and 2.5 mass% or less based on the total amount of the resin composition.
  • the photopolymerizable compound is distinguished from a polydimethylsiloxane compound having a (meth)acryloyl group in that it does not have a dimethylsiloxane skeleton.
  • the photopolymerizable compound may contain an epoxy di(meth)acrylate.
  • the epoxy di(meth)acrylate for example, a reaction product of a diglycidyl ether compound having a bisphenol skeleton and a compound having a (meth)acryloyl group, such as (meth)acrylic acid, can be used.
  • epoxy di(meth)acrylates examples include (meth)acrylic acid adducts of bisphenol A diglycidyl ether, (meth)acrylic acid adducts of bisphenol AF diglycidyl ether, and (meth)acrylic acid adducts of bisphenol F diglycidyl ether.
  • the content of the epoxy di(meth)acrylate may be 30 parts by mass or more, 40 parts by mass or more, or 45 parts by mass or more, and 70 parts by mass or less, 65 parts by mass or less, or 60 parts by mass or less, based on 100 parts by mass of the total amount of the polydimethylsiloxane compound and the photopolymerizable compound.
  • the content of the epoxy di(meth)acrylate may be 30 parts by mass or more and 70 parts by mass or less, 40 parts by mass or more and 65 parts by mass or less, or 45 parts by mass or more and 60 parts by mass or less, based on 100 parts by mass of the total amount of the polydimethylsiloxane compound and the photopolymerizable compound.
  • the content of the epoxy di(meth)acrylate may be 30 parts by mass or more and 70 parts by mass or less, 40 parts by mass or more and 65 parts by mass or less, 45 parts by mass or more and 60 parts by mass or less, based on 100 parts by mass of the total amount of the photopolymerizable compound.
  • the photopolymerizable compound may further contain a photopolymerizable compound (hereinafter referred to as "monomer") other than epoxy di(meth)acrylate.
  • a photopolymerizable compound hereinafter referred to as "monomer”
  • a monofunctional monomer having one polymerizable group or a polyfunctional monomer having two or more polymerizable groups can be used. Two or more types of monomers may be mixed and used.
  • monofunctional monomers include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, tert-butyl (meth)acrylate, isobutyl (meth)acrylate, n-pentyl (meth)acrylate, isopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, isoamyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, 3-phenoxyethyl (meth)acrylate, (Meth)acrylate mono
  • carboxy group-containing monomers such as N-(meth)acryloylmorpholine, N-vinylpyrrolidone, N-vinylcaprolactam, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, 3-(3-pyridine)propyl(meth)acrylate, and cyclic trimethylolpropane formal acrylate; heterocycle-containing monomers such as maleimide, N-cyclohexylmaleimide, and N-phenylmaleimide; (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-hexyl(meth)acrylamide, N Amide monomers such as N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-butyl(meth)acrylamide, N-methylol(meth)acrylamide, and N-methylolpropane(meth
  • polyfunctional monomers examples include polyethylene glycol di(meth)acrylate, isocyanuric acid ethylene oxide modified di(meth)acrylate, ethylene oxide modified bisphenol F di(meth)acrylate, ethylene oxide modified bisphenol A di(meth)acrylate, polypropylene glycol di(meth)acrylate, propylene oxide modified bisphenol A di(meth)acrylate, propylene oxide modified neopentyl glycol di(meth)acrylate, polytetraethylene glycol di(meth)acrylate, p) acrylate, hydroxypivalic acid neopentyl glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, 1,14-tetradecanediol di(me
  • the photopolymerizable compound may contain an alkylene oxide-modified polyfunctional monomer from the viewpoint of adjusting the Young's modulus of the colored resin layer.
  • the alkylene oxide-modified polyfunctional monomer may have at least one selected from the group consisting of an ethylene oxide (EO) chain and a propylene oxide (PO) chain.
  • EO ethylene oxide
  • PO propylene oxide
  • the ethylene oxide chain can be represented as "(EO)n” and the propylene oxide chain as "(PO)n".
  • n is an integer of 1 or more, and may be 2 or more or 3 or more, and may be 30 or less, 25 or less, or 20 or less.
  • alkylene oxide-modified polyfunctional monomers examples include alkylene oxide-modified di(meth)acrylates and alkylene oxide-modified tri(meth)acrylates.
  • alkylene oxide modified di(meth)acrylates examples include polyethylene glycol di(meth)acrylate, isocyanuric acid ethylene oxide modified di(meth)acrylate, ethylene oxide modified bisphenol F di(meth)acrylate, ethylene oxide modified bisphenol A di(meth)acrylate polypropylene glycol di(meth)acrylate, propylene oxide modified bisphenol A di(meth)acrylate, and propylene oxide modified neopentyl glycol di(meth)acrylate.
  • alkylene oxide modified tri(meth)acrylates include trimethylolpropane tri(meth)acrylate, trimethyloloctane tri(meth)acrylate, trimethylolpropane polyethoxy tri(meth)acrylate, trimethylolpropane polypropoxy tri(meth)acrylate, trimethylolpropane polyethoxy polypropoxy tri(meth)acrylate, tris[(meth)acryloyloxyethyl]isocyanurate, and pentaerythritol tri(meth)acrylate.
  • the content of the alkylene oxide-modified polyfunctional monomer is not particularly limited, but may be from 20% by mass to 70% by mass, from 30% by mass to 60% by mass, or from 40% by mass to 50% by mass, based on the total amount of the photopolymerizable compound.
  • the photopolymerization initiator can be appropriately selected from known radical photopolymerization initiators.
  • photopolymerization initiators include 1-hydroxycyclohexyl phenyl ketone (Omnirad 184, manufactured by IGM Resins), 2,2-dimethoxy-2-phenylacetophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, 2-methyl-1-[4- (methylthio)phenyl]-2-morpholino-propan-1-one (Omnirad 907, manufactured by IGM Resins), 2,4,6-trimethylbenzoyldiphenylphosphine oxide (Omnirad TPO, manufactured by IGM Resins), and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (Omnirad 819, manufactured by IGM Resins
  • the content of the photopolymerization initiator may be 1 part by mass or more and 10 parts by mass or less, 2 parts by mass or more and 8 parts by mass or less, or 3 parts by mass or more and 7 parts by mass or less, relative to 100 parts by mass of the total amount of the polydimethylsiloxane compound and the photopolymerizable compound.
  • the resin composition according to this embodiment contains titanium oxide particles.
  • Surface-treated titanium oxide particles may be used as the titanium oxide particles.
  • the surface-treated titanium oxide particles are particles in which titanium oxide has been surface-treated with an inorganic substance, and have excellent dispersibility in the resin composition.
  • examples of titanium oxide include anatase-type titanium oxide, rutile-type titanium oxide, and brookite-type titanium oxide. From the viewpoint of stability, the titanium oxide may be rutile-type titanium oxide.
  • Examples of inorganic substances used for surface treatment include aluminum oxide, silicon dioxide, and zirconium dioxide.
  • the surface-treated titanium oxide particles have a surface treatment layer containing at least one selected from the group consisting of aluminum oxide, silicon dioxide, and zirconium dioxide, dispersibility can be further improved.
  • the surface treatment layer may be formed on at least a portion of the surface of the titanium oxide, or may be formed on the entire surface of the titanium oxide.
  • the surface treatment layer is formed by surface treatment of the titanium oxide.
  • the amount of the surface treatment layer in the surface-treated titanium oxide particles may be 1.0 mass% or more, 1.5 mass% or more, or 2.0 mass% or more from the viewpoint of improving dispersibility, and may be 10.0 mass% or less, 9.0 mass% or less, or 8.0 mass% or less from the viewpoint of increasing hiding power.
  • the amount of the surface treatment layer in the surface-treated titanium oxide particles may be 1.0 mass% or more and 10.0 mass% or less, 1.5 mass% or more and 9.0 mass% or less, or 2.0 mass% or more and 8.0 mass% or less from the viewpoint of dispersibility and hiding power.
  • the amount of the surface treatment layer can be calculated by measuring the amount of titanium element and inorganic elements other than titanium contained in the surface-treated titanium oxide particles using inductively coupled mass spectrometry (ICP-MS).
  • ICP-MS inductively coupled mass spectrometry
  • the average primary particle size of the surface-treated titanium oxide particles may be 300 nm or less, 295 nm or less, or 290 nm or less, from the viewpoint of further improving the lateral pressure resistance.
  • the average primary particle size of the surface-treated titanium oxide particles may be 100 nm or more, 150 nm or more, or 200 nm or more, from the viewpoint of increasing the hiding power, and is preferably 200 nm or more and 300 nm or less.
  • the average primary particle size can be measured, for example, by image analysis of electron microscope photographs, light scattering method, BET method, etc.
  • the content of the titanium oxide particles may be 0.6 mass% or more, 1.0 mass% or more, 2.0 mass% or more, or 3.0 mass% or more based on the total amount of the resin composition from the viewpoint of improving the visibility of the colored resin layer, and may be 20.0 mass% or less, 15.0 mass% or less, 10.0 mass% or less, or 8.0 mass% or less based on the curing property of the resin composition from the viewpoint of improving the curing property of the resin composition.
  • the content of the titanium oxide particles may be 0.6 mass% or more and 20.0 mass% or less, 1.0 mass% or more and 15.0 mass% or less, 2.0 mass% or more and 10.0 mass% or less, or 3.0 mass% or more and 8.0 mass% or less based on the total amount of the resin composition from the viewpoint of the visibility of the colored resin layer and the curing property of the resin composition.
  • the resin composition may further contain a silane coupling agent, a leveling agent, an antifoaming agent, an antioxidant, a sensitizer, etc.
  • silane coupling agent is not particularly limited as long as it does not interfere with the curing of the resin composition.
  • silane coupling agents include tetramethyl silicate, tetraethyl silicate, mercaptopropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyltris( ⁇ -methoxy-ethoxy)silane, ⁇ -(3,4-epoxycyclohexyl)-ethyltrimethoxysilane, dimethoxydimethylsilane, diethoxydimethylsilane, 3-acryloxypropyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropylmethyldiethoxysilane, ⁇ -methacryloxypropyltrimethoxysilane, N-( ⁇ -aminoethyl)- ⁇ -aminopropyltrimethoxysilane, N
  • the resin composition according to this embodiment When the resin composition according to this embodiment is cured with an integrated light amount of 900 mJ/ cm2 or more and 1100 mJ/ cm2 or less, and the resin film has a breaking elongation of 6% or more and 50% or less at 23° C., a resin layer having excellent toughness can be formed.
  • the breaking elongation of the resin film may be 6.5% or more, 7% or more, or 10% or more, and may be 45% or less, 40% or less, or 30% or less.
  • the Young's modulus of the resin film may be 400 MPa or more, 450 MPa or more, or 500 MPa or more at 23°C. From the viewpoint of forming a resin layer with excellent toughness, the Young's modulus of the resin film may be 1500 MPa or less, 1200 MPa or less, or 1000 MPa or less at 23°C.
  • FIG. 1 is a schematic cross-sectional view showing the configuration of an optical fiber according to one embodiment.
  • the optical fiber 1 comprises a glass fiber 10 and a coating resin layer 20 that contacts the glass fiber 10 and covers the outer periphery of the glass fiber 10.
  • the glass fiber 10 comprises a core 12 and a cladding 14.
  • the coating resin layer 20 comprises a primary resin layer 22, a secondary resin layer 24, and a colored resin layer 26.
  • the glass fiber 10 is a light-guiding optical transmission body that transmits light introduced into the optical fiber 1.
  • the glass fiber 10 is a glass member, and is configured with, for example, silica (SiO 2 ) glass as a base material (main component).
  • the glass fiber 10 includes a core 12 and a clad 14 that covers the core 12.
  • the glass fiber 10 transmits light introduced into the optical fiber 1.
  • the core 12 is provided, for example, in a region including the central axis of the glass fiber 10.
  • the core 12 is made of, for example, pure silica (SiO 2 ) glass, or SiO 2 glass containing germanium dioxide (GeO 2 ) and/or fluorine element.
  • the clad 14 is provided in a region surrounding the core 12.
  • the clad 14 has a refractive index lower than that of the core 12.
  • the clad 14 is made of, for example, pure SiO 2 glass, or SiO 2 glass to which fluorine element is added.
  • the outer diameter of the glass fiber 10 is, for example, about 100 ⁇ m to 125 ⁇ m, and the diameter of the core 12 constituting the glass fiber 10 is, for example, about 7 ⁇ m to 15 ⁇ m.
  • the coating resin layer 20 is an ultraviolet-curable resin layer that covers the clad 14.
  • the coating resin layer 20 includes a primary resin layer 22 that coats the outer circumference of the glass fiber 10, a secondary resin layer 24 that coats the outer circumference of the primary resin layer 22, and a colored resin layer 26 that coats the outer circumference of the secondary resin layer 24.
  • the primary resin layer 22 is in contact with the outer circumference of the clad 14 and coats the entire clad 14.
  • the secondary resin layer 24 is in contact with the outer circumference of the primary resin layer 22 and coats the entire primary resin layer 22.
  • the colored resin layer 26 is in contact with the outer circumference of the secondary resin layer 24 and coats the entire secondary resin layer 24.
  • the thickness of the primary resin layer 22 is, for example, 10 ⁇ m or more and 50 ⁇ m or less.
  • the thickness of the secondary resin layer 24 is, for example, 10 ⁇ m or more and 40 ⁇ m or less.
  • the thickness of the colored resin layer 26 is, for example, 3 ⁇ m or more and 10 ⁇ m or less.
  • the outer diameter of the optical fiber 1 may be 255 ⁇ m or less, 220 ⁇ m or less, 180 ⁇ m or less, or 160 ⁇ m or less, or may be 140 ⁇ m or more.
  • the outer diameter of the optical fiber 1 may be 140 ⁇ m or more and 255 ⁇ m or less, 140 ⁇ m or more and 220 ⁇ m or less, 140 ⁇ m or more and 180 ⁇ m or less, or 140 ⁇ m or more and 160 ⁇ m or less.
  • the thickness of each of the primary resin layer 22 and the secondary resin layer 24 may be about 8 ⁇ m to 38 ⁇ m, for example, the thickness of the primary resin layer 22 may be 25 ⁇ m and the thickness of the secondary resin layer 24 may be 10 ⁇ m.
  • the outer diameter of the optical fiber 1 may be about 165 ⁇ m to 221 ⁇ m.
  • the thickness of each of the primary resin layer 22 and the secondary resin layer 24 may be about 5 ⁇ m to 32 ⁇ m, for example, the thickness of the primary resin layer 22 may be 25 ⁇ m and the thickness of the secondary resin layer 24 may be 10 ⁇ m.
  • the outer diameter of the optical fiber 1 may be about 144 ⁇ m to 174 ⁇ m.
  • the primary resin layer 22 can be formed, for example, by curing a resin composition containing urethane (meth)acrylate, a monomer, and a photopolymerization initiator.
  • the resin composition for the primary resin layer can be formed using conventional techniques.
  • the secondary resin layer 24 can be formed, for example, by curing a resin composition containing urethane (meth)acrylate, a monomer, and a photopolymerization initiator.
  • the resin composition for the secondary resin layer can be formed using conventional techniques.
  • the colored resin layer 26 can be formed by curing the resin composition for the colored resin layer.
  • the number of titanium-containing particles having a diameter of 5 ⁇ m or more (hereinafter also referred to as "particles having a diameter of 5 ⁇ m or more”) contained in the colored resin layer 26 is less than 15 pieces/mm in the length direction of the colored resin layer from the viewpoint of lateral pressure resistance characteristics. From the viewpoint of further improving the lateral pressure resistance characteristics, the number of particles having a diameter of 5 ⁇ m or more contained in the colored resin layer 26 may be 14 pieces/mm or less, 13 pieces/mm or less, 12 pieces/mm or less, 11 pieces/mm or less, 10 pieces/mm or less, or 5 pieces/mm or less in the length direction of the colored resin layer.
  • the number of particles having a diameter of 5 ⁇ m or more contained in the colored resin layer 26 may be 0 pieces/mm in the length direction of the colored resin layer.
  • Particles having a diameter of 5 ⁇ m or more are particles having a diameter of 5 ⁇ m or more (maximum diameter in the case of a shape other than spherical) when observed using an optical microscope.
  • the particles having a diameter of 5 ⁇ m or more contained in the colored resin layer 26 include aggregates caused by titanium oxide particles.
  • the number of particles with a diameter of 5 ⁇ m or more can be measured using an optical microscope, and the presence of titanium element can be determined by performing X-ray analysis.
  • the amount of silicon (Si) on the surface of the colored resin layer 26 is 0.9 at% or more and 11 at% or less from the viewpoint of lateral pressure resistance and hot water resistance. At% is atomic percent. That is, the ratio of silicon element to the elements on the surface of the colored resin layer 26 is 0.9 atomic percent or more and 11 atomic percent or less. From the viewpoint of lateral pressure resistance, the amount of Si on the surface of the colored resin layer 26 may be 1 at% or more, 1.5 at% or more, or 2 at% or more, and from the viewpoint of hot water resistance, it may be 10.5 at% or less or 10 at% or less.
  • the amount of Si on the surface of the colored resin layer 26 may be 1 at% or more and 10.5 at% or less, 1 at% or more and 10 at% or less, 1.5 at% or more and 10 at% or less, or 2 at% or more and 10 at% or less.
  • optical fiber ribbon The optical fiber according to this embodiment can be used to fabricate an optical fiber ribbon, which is made up of a plurality of the optical fibers arranged in parallel and coated with a ribbon resin.
  • FIG. 2 is a schematic cross-sectional view showing an optical fiber ribbon according to one embodiment.
  • the optical fiber ribbon 100 has a plurality of optical fibers 1 and a connecting resin layer 40 in which the optical fibers 1 are coated with a ribbon resin and connected.
  • four optical fibers 1 are shown as an example, but the number is not particularly limited.
  • the resin for the ribbon resin materials generally known as ribbon materials can be used.
  • the resin for the ribbon may contain a thermosetting resin such as silicone resin, epoxy resin, or urethane resin, or an ultraviolet-curing resin such as epoxy acrylate, urethane acrylate, or polyester acrylate.
  • the optical fiber ribbon of this embodiment uses the above optical fiber, and has excellent resistance to lateral pressure and hot water.
  • the decomposition solution was diluted 50 times with ultrapure water to prepare a sample.
  • the amount of Si contained in the polydimethylsiloxane compound was calculated by quantifying the amount of Si in the sample using an ICP emission spectrometer ("iCAP6300" manufactured by Thermo Fisher Scientific Co., Ltd.).
  • Photopolymerizable Compound As photopolymerizable compounds, bisphenol A epoxy diacrylate (EA), tripropylene glycol diacrylate (TPGDA), EO-modified trimethylolpropane triacrylate (TMP(EO) 3 TA), and EO-modified bisphenol A diacrylate (BPA(EO) 30 DA) were prepared.
  • EA bisphenol A epoxy diacrylate
  • TPGDA tripropylene glycol diacrylate
  • TMP(EO) 3 TA EO-modified trimethylolpropane triacrylate
  • BPA(EO) 30 DA EO-modified bisphenol A diacrylate
  • Photopolymerization initiator As photoinitiators, 2,4,6-trimethylbenzoyldiphenylphosphine oxide (Omnirad TPO) and 1-hydroxycyclohexyl phenyl ketone (Omnirad 184) were prepared.
  • titanium oxide particles As the titanium oxide particles, surface-treated titanium oxide particles having a surface treatment layer containing aluminum oxide (Al 2 O 3 ) were prepared.
  • the average primary particle size of the surface-treated titanium oxide particles was 200 to 300 nm, and the amount of Al 2 O 3 calculated by ICP-MS measurement was 2.5 mass %.
  • Test Examples 1 to 10 correspond to working examples, and Test Examples 9 and 10 correspond to comparative examples.
  • Resin composition for primary resin layer A urethane acrylate oligomer obtained by reacting polypropylene glycol having a molecular weight of 4000, isophorone diisocyanate, and hydroxyethyl acrylate was prepared. 65 parts by mass of this urethane acrylate oligomer, 25 parts by mass of nonylphenol polyethylene glycol (meth)acrylate, 10 parts by mass of N-vinyl caprolactam, and 1 part by mass of 2,4,6-trimethylbenzoyldiphenylphosphine oxide (manufactured by BASF, product name "Lucirin TPO”) were mixed to prepare a resin composition P.
  • Resin composition S was prepared by mixing 40 parts by weight of urethane acrylate oligomer (UA), which is a reaction product of polypropylene glycol having a molecular weight of 600, 2,4-tolylene diisocyanate, and 2-hydroxyethyl acrylate, 35 parts by weight of isobornyl acrylate (IBOA), 24 parts by weight of epoxy acrylate (EA), which is an acrylic acid adduct of bisphenol A diglycidyl ether, 1 part by weight of Omnirad TPO, and 1 part by weight of Omnirad 184.
  • U urethane acrylate oligomer
  • IBOA isobornyl acrylate
  • EA epoxy acrylate
  • a 35 ⁇ m thick primary resin layer was formed on the outer circumference of a 125 ⁇ m diameter glass fiber composed of a core and a clad using resin composition P, and a 25 ⁇ m thick secondary resin layer was further formed on the outer circumference using resin composition S, to produce an optical fiber with a diameter of 245 ⁇ m.
  • a 5 ⁇ m thick colored resin layer was formed on the outer circumference of the secondary resin layer using the resin compositions of Test Examples 1 to 10 while the optical fiber was reeled out using a coloring machine, thereby producing an optical fiber with a diameter of 255 ⁇ m having a colored resin layer (hereinafter referred to as a "colored optical fiber").
  • the linear speed when forming each resin layer was 1500 m/min.
  • the colored optical fiber was immersed in silicone oil and observed from the side with an optical microscope (magnification 300 times) to measure the number of particles with a diameter of 5 ⁇ m or more (maximum diameter in the case of a shape other than a sphere) per mm in the length direction of the colored optical fiber.
  • the number of measurement regions was set to 10, and the average value was calculated. Whether or not the particles contained titanium elements was determined by performing X-ray analysis of the colored optical fiber and whether or not titanium elements were detected.
  • Si content on the surface of colored resin layer The amount of Si on the surface of the colored resin layer of the colored optical fiber was measured by X-ray photoelectron spectroscopy using a Quantera SXM manufactured by ULVAC PHI. The measurement was performed under the following conditions. The measurement results are shown in Table 2.
  • X-ray conditions 20 ⁇ m, 4.5W, 15kV Transmission energy: Narrow 55 eV, Depth 112 eV Photoelectron take-off angle: 45° Ion gun conditions at depth: 0.5 kV, 1 kV, 2 kV 1 x 1 Average sputtering speed: 1.04nm/min
  • a colored optical fiber was wound in a single layer around a 280 mm diameter bobbin covered with sandpaper (grit 240) and the colored optical fiber was wound around a mandrel with a diameter of 40 mm, and the transmission loss of light with a wavelength of 1550 nm was measured by an OTDR (Optical Time Domain Reflectometer) method. The difference in the measured transmission losses was calculated, and the lateral pressure resistance characteristics were evaluated by assigning "A" to cases where the transmission loss difference was 0.5 dB/km or less and "B" to cases where the transmission loss difference was more than 0.5 dB/km.
  • Hot water resistance A 1000 m bundle of colored optical fiber was immersed in hot water at 60° C. for 30 days, and then the transmission loss of light with a wavelength of 1550 nm was measured by the OTDR (Optical Time Domain Reflectometer) method. Hot water resistance was evaluated by assigning a grade of "A" to cases where the difference between the transmission loss before immersion in hot water and the transmission loss after immersion in hot water for 30 days was 0.05 dB/km or less, and a grade of "B" to cases where the difference was more than 0.05 dB/km.
  • Reference Signs List 1 Optical fiber 10: Glass fiber 12: Core 14: Cladding 20: Coating resin layer 22: Primary resin layer 24: Secondary resin layer 26: Colored resin layer 40: Connecting resin layer 100: Optical fiber ribbon

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005165227A (ja) * 2003-12-05 2005-06-23 Sumitomo Electric Ind Ltd 光ファイバ着色心線、及び光ファイバテープ心線
JP2006084770A (ja) * 2004-09-16 2006-03-30 Hitachi Cable Ltd 着色被覆光ファイバ心線及びその製造方法
JP2016070966A (ja) * 2014-09-26 2016-05-09 住友電気工業株式会社 光ファイバ心線及び光ファイバテープ心線
US20170371122A1 (en) * 2016-06-28 2017-12-28 Corning Incorporated Fiber marking with optical brighteners
JP2019504339A (ja) * 2015-11-25 2019-02-14 コーニング インコーポレイテッド 光拡散性光ファイバ用コーティング
WO2023074296A1 (ja) * 2021-10-26 2023-05-04 住友電気工業株式会社 光ファイバ被覆用の樹脂組成物、光ファイバの着色被覆材料、及び光ファイバ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005165227A (ja) * 2003-12-05 2005-06-23 Sumitomo Electric Ind Ltd 光ファイバ着色心線、及び光ファイバテープ心線
JP2006084770A (ja) * 2004-09-16 2006-03-30 Hitachi Cable Ltd 着色被覆光ファイバ心線及びその製造方法
JP2016070966A (ja) * 2014-09-26 2016-05-09 住友電気工業株式会社 光ファイバ心線及び光ファイバテープ心線
JP2019504339A (ja) * 2015-11-25 2019-02-14 コーニング インコーポレイテッド 光拡散性光ファイバ用コーティング
US20170371122A1 (en) * 2016-06-28 2017-12-28 Corning Incorporated Fiber marking with optical brighteners
WO2023074296A1 (ja) * 2021-10-26 2023-05-04 住友電気工業株式会社 光ファイバ被覆用の樹脂組成物、光ファイバの着色被覆材料、及び光ファイバ

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