WO2022168476A1 - 樹脂組成物、光ファイバ、光ファイバの製造方法、光ファイバリボン、及び光ファイバケーブル - Google Patents
樹脂組成物、光ファイバ、光ファイバの製造方法、光ファイバリボン、及び光ファイバケーブル Download PDFInfo
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- WO2022168476A1 WO2022168476A1 PCT/JP2021/047301 JP2021047301W WO2022168476A1 WO 2022168476 A1 WO2022168476 A1 WO 2022168476A1 JP 2021047301 W JP2021047301 W JP 2021047301W WO 2022168476 A1 WO2022168476 A1 WO 2022168476A1
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- WIPO (PCT)
- Prior art keywords
- meth
- acrylate
- optical fiber
- resin composition
- urethane
- Prior art date
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 159
- 239000011342 resin composition Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 177
- -1 polypropylene Polymers 0.000 claims abstract description 88
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000000576 coating method Methods 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 239000004743 Polypropylene Substances 0.000 claims abstract description 33
- 150000003077 polyols Chemical class 0.000 claims abstract description 33
- 229920001155 polypropylene Polymers 0.000 claims abstract description 33
- 229920005862 polyol Polymers 0.000 claims abstract description 32
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims description 132
- 239000011347 resin Substances 0.000 claims description 132
- 150000001346 alkyl aryl ethers Chemical class 0.000 claims description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 25
- 239000003365 glass fiber Substances 0.000 claims description 24
- 125000005442 diisocyanate group Chemical group 0.000 claims description 18
- 229910000077 silane Inorganic materials 0.000 claims description 8
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 239000003999 initiator Substances 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 97
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 40
- 229920001451 polypropylene glycol Polymers 0.000 description 19
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 18
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 17
- 239000012975 dibutyltin dilaurate Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 16
- 239000003054 catalyst Substances 0.000 description 15
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- 239000000203 mixture Substances 0.000 description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 9
- 239000000178 monomer Substances 0.000 description 9
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- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 6
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- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 6
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- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 3
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- 125000003545 alkoxy group Chemical group 0.000 description 3
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C08L75/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
-
- 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
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
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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
- C03C2217/00—Coatings on glass
- C03C2217/40—Coatings comprising at least one inhomogeneous layer
- C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
- C03C2217/44—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the composition of the continuous phase
- C03C2217/445—Organic continuous phases
-
- 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
- C03C2218/00—Methods for coating glass
- C03C2218/30—Aspects of methods for coating glass not covered above
- C03C2218/32—After-treatment
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
-
- 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
- G02B6/4401—Optical cables
- G02B6/4403—Optical cables with ribbon structure
Definitions
- the present disclosure relates to resin compositions for primary coatings of optical fibers, optical fibers, methods of making optical fibers, optical fiber ribbons, and optical fiber cables.
- This application claims priority based on Japanese application No. 2021-016587 filed on February 4, 2021, and incorporates all the descriptions described in the Japanese application.
- an optical fiber is provided with a coating resin layer for protecting the glass fiber, which is an optical transmission body.
- the coating resin layer is composed of, for example, two layers, a primary resin layer in contact with the glass fiber and a secondary resin layer formed on the outer layer of the primary resin layer.
- an external force lateral pressure
- microbend loss tends to increase.
- Patent Documents 1 to 5 describe a resin composition for primary coating containing urethane (meth)acrylate which is a reaction product of polyol, diisocyanate and hydroxyl group-containing (meth)acrylate.
- a resin composition for a primary coating of an optical fiber includes a polypropylene polyol having a number average molecular weight of 8000 or more and 20000 or less, and a urethane (meth)acrylate containing a reaction product of an isocyanate group-containing (meth)acrylate. and a photopolymerization initiator.
- FIG. 1 is a schematic cross-sectional view showing an example of an optical fiber according to this embodiment.
- FIG. 2 is a schematic cross-sectional view showing an optical fiber ribbon according to one embodiment.
- FIG. 3 is a schematic cross-sectional view showing an optical fiber ribbon according to one embodiment.
- FIG. 4 is a plan view showing the appearance of an optical fiber ribbon according to one embodiment.
- FIG. 5 is a schematic cross-sectional view showing an optical fiber cable according to one embodiment.
- FIG. 6 is a schematic cross-sectional view showing an optical fiber cable according to one embodiment.
- the resin composition for the primary coating tends to have a lower breaking strength as the Young's modulus is lowered, causing defects (voids) in the primary resin layer, which tends to lead to an increase in transmission loss, especially at low temperatures.
- the present disclosure provides a resin composition that achieves both a low Young's modulus and high breaking strength and can form a resin layer suitable for the primary coating of an optical fiber, and an optical fiber that is excellent in microbend resistance and low temperature properties.
- the purpose is to
- a resin composition that achieves both a low Young's modulus and a high breaking strength and is capable of forming a resin layer suitable for the primary coating of an optical fiber, and an optical fiber that is excellent in microbend resistance and low temperature characteristics are provided. can provide.
- An optical fiber primary coating resin composition includes a polypropylene polyol having a number average molecular weight of 8000 or more and 20000 or less, and a urethane (meth)acrylate containing a reaction product of an isocyanate group-containing (meth)acrylate (A ) and a photopolymerization initiator.
- Such a resin composition can achieve both a low Young's modulus and a high breaking strength, and does not cause defects in the primary resin layer.
- the microbend resistance and low temperature properties of the fiber can be improved.
- the urethane (meth)acrylate (A) consists of a polypropylene polyol having a number average molecular weight of 8000 or more and 20000 or less, an isocyanate group-containing (meth)acrylate, and an isocyanate group-containing silane. It may further include a reactant with the compound.
- the photopolymerizable compound is urethane (meth)acrylate which is a reaction product of polypropylene polyol having a number average molecular weight of 2000 or more and 20000 or less, diisocyanate, and hydroxyl group-containing (meth)acrylate. (B) may be further included.
- the number average molecular weight of the polypropylene polyol used for the urethane (meth)acrylate (B) may be 6000 or more and 20000 or less.
- a reaction product of a polyoxyalkylene monoalkyl ether, a diisocyanate and a hydroxyl group-containing (meth)acrylate or a reaction of a polyoxyalkylene monoalkyl ether and an isocyanate group-containing (meth)acrylate It may further include a urethane (meth)acrylate (C) containing a
- the number average molecular weight of the polyoxyalkylene monoalkyl ether may be 2,000 or more and 10,000 or less because the Young's modulus is adjusted to be suitable for the primary resin layer.
- An optical fiber includes a glass fiber including a core and a clad, a primary resin layer that is in contact with the glass fiber and coats the glass fiber, and a secondary resin layer that coats the primary resin layer, the primary A resin layer contains the hardened
- Such an optical fiber does not cause defects in the primary resin layer and has excellent microbend resistance and low temperature properties.
- a method for manufacturing an optical fiber according to an aspect of the present disclosure includes a coating step of coating the resin composition on the outer circumference of a glass fiber including a core and a clad, and irradiating the resin composition with ultraviolet rays after the coating step. and a curing step of curing. As a result, an optical fiber having excellent microbending resistance and low-temperature characteristics can be produced.
- An optical fiber ribbon includes a plurality of the optical fibers arranged in parallel and coated with a ribbon resin.
- Such optical fiber ribbons are excellent in micro-bending resistance and low-temperature properties, and can be densely packed in optical fiber cables.
- An optical fiber cable according to one aspect of the present disclosure has the optical fiber ribbon housed therein.
- the optical fiber cable according to the present disclosure may be arranged such that a plurality of the optical fibers are housed in the cable.
- An optical fiber cable including the optical fiber or optical fiber ribbon according to this embodiment has excellent microbend resistance and low temperature characteristics.
- the resin composition according to the present embodiment includes a polypropylene polyol having a number average molecular weight (Mn) of 8000 or more and 20000 or less, and a urethane (meth) acrylate (A) containing a reaction product of an isocyanate group-containing (meth) acrylate. and a photopolymerization initiator.
- the urethane (meth)acrylate (A) has an oxypropylene chain derived from a polypropylene polyol having an Mn of 8000 or more and 20000 or less and a (meth)acryloyl group derived from an isocyanate group-containing (meth)acrylate.
- Mn of the polypropylene polyol constituting the urethane (meth)acrylate (A) is 9000 or more and 19500 or less, 10000 or more and 19000 or less, or It may be 11000 or more and 18500 or less.
- the polypropylene polyol may be a bifunctional polypropylene polyol (polypropylene glycol) having two hydroxyl groups, or may be a trifunctional polypropylene polyol (polyoxypropylene triol) having three hydroxyl groups, polypropylene glycol and poly It may be a mixture with oxypropylene triol.
- isocyanate group-containing (meth)acrylates examples include 2-acryloyloxyethyl isocyanate, 2-methacryloyloxyethyl isocyanate, 2-(2-isocyanatoethoxy)ethyl methacrylate, 1,1-(bisacryloyloxymethyl)ethyl isocyanate, and 1,1-(bismethacryloyloxymethyl)ethyl isocyanate. From the viewpoint of reactivity, 2-acryloyloxyethyl isocyanate is preferred.
- the urethane (meth)acrylate (A) consists of a polypropylene polyol having an Mn of 8000 or more and 20000 or less, an isocyanate group-containing (meth)acrylate, and an isocyanate group-containing silane compound. may further include a reactant with That is, the urethane (meth)acrylate (A) may have an alkoxysilyl group derived from an isocyanate group-containing silane compound in addition to the oxypropylene chain and (meth)acryloyl group.
- isocyanate group-containing silane compounds examples include 3-(triethoxysilyl)propyl isocyanate and 3-(trimethoxysilyl)propyl isocyanate.
- the urethane (meth)acrylate (A) is obtained by reacting a polypropylene polyol, an isocyanate group-containing (meth)acrylate, and, if necessary, an isocyanate group-containing silane compound.
- Urethane (meth)acrylate (A) can contain a mixture of urethane (meth)acrylates represented by the following formulas (1) to (3).
- AI is an isocyanate group-containing (meth)acrylate residue
- U is a urethane bond
- PO is a polypropylene polyol residue
- OH is a hydroxyl group
- SC is an isocyanate group-containing silane compound.
- the urethane (meth)acrylate represented by (1) when the isocyanate group-containing silane compound is not added, the urethane (meth)acrylate represented by (1), or the urethane (meth)acrylate represented by (1) and ( A mixture with urethane (meth)acrylate represented by 2) is produced.
- the molar ratio of NCO and OH (NCO/OH) when reacting polypropylene polyol and isocyanate group-containing (meth)acrylate is preferably 0.4 or more and 1.1 or less, more preferably 0.5 or more and 1.0 or less. preferable.
- the molar ratio of NCO to OH (NCO/OH) when the polypropylene polyol and the isocyanate group-containing silane compound are reacted is preferably 0.01 or more and 0.5 or less, more preferably 0.03 or more and 0.3 or less.
- Mn of the urethane (meth)acrylate (A) may be 10000 or more and 50000 or less, 12000 or more and 40000 or less, or 14000 or more and 30000 or less.
- the Mn of the urethane (meth)acrylate according to this embodiment can be measured by a GPC (gel permeation chromatography) method.
- a polypropylene polyol having an Mn of 2000 or more and 20000 or less, a diisocyanate, and a hydroxyl group-containing (meth)acrylate urethane (meth)acrylate which is a reaction product (B) may be included.
- the urethane (meth)acrylate (B) has an oxypropylene chain derived from a polypropylene polyol having an Mn of 2000 or more and 20000 or less and a (meth)acryloyl group derived from a hydroxyl group-containing (meth)acrylate.
- the Mn of the polypropylene polyol constituting the urethane (meth)acrylate (B) may be 6000 or more and 20000 or less, 8000 or more and 19000 or less, or 10000 or more and 18500 or less from the viewpoint of further increasing the breaking strength of the primary resin layer.
- Polypropylene glycol is preferably used as the polypropylene polyol because it facilitates adjustment of the Young's modulus and breaking strength of the primary resin layer.
- Diisocyanates include, for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, 1, 5-naphthalene diisocyanate, norbornene diisocyanate, 1,5-pentamethylene diisocyanate, tetramethylxylylene diisocyanate, and trimethylhexamethylene diisocyanate.
- hydroxyl group-containing (meth)acrylates examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, caprolactone (meth)acrylate, 2-hydroxy-3- Phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxyethyl phthalate, 2-hydroxy-O-phenylphenolpropyl (meth)acrylate, 2-hydroxy-3-methacrylpropyl acrylate, trimethylol Propane di(meth)acrylate and pentaerythritol tri(meth)acrylate. From the viewpoint of reactivity, 2-hydroxyethyl acrylate is preferred.
- a method for preparing the urethane (meth)acrylate (B) for example, a method of reacting a polypropylene polyol and a diisocyanate and then reacting a hydroxyl group-containing (meth)acrylate; reacting a diisocyanate and a hydroxyl group-containing (meth)acrylate.
- the urethane (meth)acrylate (B) can contain a urethane (meth)acrylate represented by the following formula (4).
- AH represents a hydroxyl group-containing (meth)acrylate residue
- U represents a urethane bond
- I represents a diisocyanate residue
- PO represents a polypropylene polyocol residue
- n is an integer of 1 or more.
- Urethane acrylate (B) may contain urethane (meth)acrylate represented by the following formula (5) as a by-product.
- urethane (meth)acrylate represented by the following formula (5) as a by-product.
- the molar ratio of NCO and OH (NCO/OH) when reacting polypropylene glycol and diisocyanate is preferably 1.1 or more and 4.0 or less, more preferably 1.2 or more and 3.5 or less, and 1.4 or more. 3.0 or less is more preferable.
- Mn of the urethane (meth)acrylate (B) may be 10000 or more and 50000 or less, 15000 or more and 45000 or less, or 20000 or more and 40000 or less.
- a reaction product of a polyoxyalkylene monoalkyl ether, a diisocyanate, and a hydroxyl group-containing (meth)acrylate, or a polyoxyalkylene monoalkyl ether and an isocyanate group-containing may also be included.
- Urethane (meth)acrylate (C) is a monofunctional urethane (meth)acrylate having one (meth)acryloyl group.
- a monofunctional urethane (meth)acrylate (C1) that is a reaction product of a polyoxyalkylene monoalkyl ether, a diisocyanate, and a hydroxyl group-containing (meth)acrylate can be represented by the following formula (6).
- AH represents a hydroxyl group-containing (meth)acrylate residue
- U represents a urethane bond
- I represents a diisocyanate residue
- P1 represents a polyoxyalkylene monoalkyl ether residue.
- the urethane (meth)acrylate (C1) has a (meth)acryloyl group derived from a hydroxyl group-containing (meth)acrylate and an alkoxy group derived from a polyoxyalkylene monoalkyl ether.
- a method for synthesizing the urethane (meth)acrylate (C1) for example, a method of reacting a polyoxyalkylene monoalkyl ether and a diisocyanate and then reacting a hydroxyl group-containing (meth)acrylate; diisocyanate and a hydroxyl group-containing (meth)
- a method of reacting polyoxyalkylene monoalkyl ether after reacting acrylate; and a method of simultaneously reacting polyoxyalkylene monoalkyl ether, diisocyanate and hydroxyl group-containing (meth)acrylate can be mentioned.
- a urethane (meth)acrylate (C2) that is a reaction product of a polyoxyalkylene monoalkyl ether and an isocyanate group-containing (meth)acrylate can be represented by the following formula (7).
- AI represents an isocyanate group-containing (meth)acrylate residue
- U represents a urethane bond
- P1 represents a polyoxyalkylene monoalkyl ether residue.
- the urethane (meth)acrylate (C2) has a (meth)acryloyl group derived from an isocyanate group-containing (meth)acrylate and an alkoxy group derived from a polyoxyalkylene monoalkyl ether.
- a polyoxyalkylene monoalkyl ether is a compound having an oxyalkylene group, an alkoxy group and a hydroxyl group.
- Examples of the polyoxyalkylene monoalkyl ether according to the present embodiment include polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene alkyl (C 12 to C 14 ) ether, polyoxyethylene tridecyl ether, polyoxyethylene myristyl ether, polyoxyethylene isostearyl ether, polyoxyethylene octyldodecyl ether, polyoxyethylene cholesteryl ether, polyoxypropylene butyl ether, polyoxypropylene myristyl ether, polyoxypropylene Cetyl ether, polyoxypropylene stearyl ether, polyoxypropylene lanolin alcohol ether, polyoxyethylene polyoxypropylene butyl ether, polyoxyethylene polyoxy
- the polyoxyalkylene monoalkyl ether is preferably polyoxypropylene monobutyl ether.
- the number average molecular weight of the polyoxyalkylene monoalkyl ether is preferably 2000 or more and 10000 or less, may be 2100 or more or 2200 or more, and may be 8000 or less or 7000. It may be below.
- the Mn of polypropylene polyol and polyoxyalkylene monoalkyl ether can be calculated from the following formula by measuring the OH value based on JIS K 0070.
- the polypropylene polyol has a functionality of 2 or 3
- the polyoxyalkylene monoalkyl ether has a functionality of 1.
- Mn 56.1 ⁇ number of functional groups ⁇ 1000 / hydroxyl value
- the polyoxyalkylene monoalkyl ether contains a high molecular weight component having a molecular weight of 50000 or more, and may have an asymmetric molecular weight distribution with a tail on the high molecular weight side.
- Such polyoxyalkylene monoalkyl ethers include, for example, trade names “Acrobute MB-90” and “Acrobute MB-52” manufactured by NOF Corporation.
- the presence or absence of high molecular weight components having a molecular weight of 50,000 or more can be confirmed by measurement by gel permeation chromatography (GPC).
- the molecular weight of the high molecular weight component may be 100,000 or more and 1,000,000 or less.
- the Mn of the urethane (meth)acrylate (C) may be 4000 or more and 20000 or less, 5000 or more and 18000 or less, or 6000 or more and 15000 or less.
- Organotin compounds include, for example, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin malate, dibutyltin bis(2-ethylhexyl mercaptoacetate), dibutyltin bis(isooctyl mercaptoacetate), and dibutyltin oxide.
- Dibutyltin dilaurate or dibutyltin diacetate is preferably used as the catalyst from the standpoint of ready availability or catalytic performance.
- the content of the urethane (meth)acrylate (A) is preferably 10 parts by mass or more and 90 parts by mass or less based on the total amount of 100 parts by mass of the resin composition. Part or more and 85 mass parts or less are more preferable, and 20 mass parts or more and 80 mass parts or less are still more preferable.
- the content of the urethane (meth)acrylate (B) is preferably 0 parts by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and 45 parts by mass or less, based on the total amount of 100 parts by mass of the resin composition. Part or more and 40 parts by mass or less is more preferable.
- the content of the urethane (meth)acrylate (C) is preferably 0 parts by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and 45 parts by mass or less, based on the total amount of 100 parts by mass of the resin composition. Part or more and 40 parts by mass or less is more preferable.
- the total content of urethane (meth)acrylate (A) urethane (meth)acrylate (B) and urethane (meth)acrylate (C) is 50 parts by mass or more and 90 parts by mass or less based on the total amount of the resin composition. It can be.
- the photopolymerizable compound may further contain a photopolymerizable compound having no urethane bond (hereinafter referred to as "monomer").
- monomers include (meth)acrylic acid esters, N-vinyl compounds, and (meth)acrylamide compounds.
- the monomer may be a monofunctional monomer having one photopolymerizable ethylenically unsaturated group, or a polyfunctional monomer having two or more ethylenically unsaturated groups. You may use a monomer in mixture of 2 or more types.
- Monofunctional (meth)acrylic acid esters include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t- 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 ) acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, phenoxyethyl (meth)acrylate, tetrahydrofur
- polyfunctional (meth)acrylic acid esters examples include ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, and tripropylene glycol.
- the Young's modulus of the resin layer can be adjusted by including the (meth)acrylic acid ester in the photopolymerizable compound.
- the content of the (meth)acrylic acid ester is 1 part by mass or more and 50 parts by mass or less, 3 parts by mass or more and 45 parts by mass or less, or 5 parts by mass or more and 40 parts by mass or less based on the total amount of 100 parts by mass of the resin composition. may be
- N-vinyl compounds include N-vinylpyrrolidone, N-vinylcaprolactam, N-vinylmethyloxazolidinone, N-vinylimidazole, and N-vinyl-N-methylacetamide.
- the curing speed of the resin composition can be further improved.
- the content of the N-vinyl compound is 1 part by mass or more and 30 parts by mass or less, 2 parts by mass or more and 20 parts by mass or less, or 5 parts by mass or more and 15 parts by mass or less based on the total amount of the resin composition of 100 parts by mass.
- (Meth)acrylamide compounds include, for example, dimethyl(meth)acrylamide, diethyl(meth)acrylamide, (meth)acryloylmorpholine, hydroxymethyl(meth)acrylamide, hydroxyethyl(meth)acrylamide, isopropyl(meth)acrylamide, dimethylamino Propyl (meth)acrylamide, dimethylaminopropylacrylamide/methyl chloride salt, diacetone acrylamide, (meth)acryloylpiperidine, (meth)acryloylpyrrolidine, (meth)acrylamide, N-hexyl (meth)acrylamide, N-methyl (meth) Acrylamide, N-butyl(meth)acrylamide, N-methylol(meth)acrylamide, and N-methylolpropane(meth)acrylamide.
- the curing speed of the resin composition can be further improved.
- the content of the (meth)acrylamide compound is 1 part by mass or more and 30 parts by mass or less, 2 parts by mass or more and 20 parts by mass or less, or 3 parts by mass or more and 15 parts by mass or less based on the total amount of 100 parts by mass of the resin composition. It can be.
- the photopolymerization initiator can be appropriately selected from known radical photopolymerization initiators and used.
- photopolymerization initiators include 1-hydroxycyclohexylphenyl ketone (Omnirad 184, manufactured by IGM Resins), 2,2-dimethoxy-2-phenylacetophenone (Omnirad 651, manufactured by IGM Resins), 2,4,6 -trimethylbenzoyldiphenylphosphine oxide (Omnirad TPO, manufactured by IGM Resins), ethyl (2,4,6-trimethylbenzoyl)-phenylphosphinate (Omnirad TPO-L, manufactured by IGM Resins), 2-benzoyl-2-dimethyl Amino-4'-morpholinobtyrophenone (Omnirad 369, manufactured by IGM Resins), 2-dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)-
- the photopolymerization initiator preferably contains 2,4,6-trimethylbenzoyldiphenylphosphine oxide because the resin composition has excellent rapid curing properties.
- the content of the photopolymerization initiator is preferably 0.2 parts by mass or more and 5 parts by mass or less, more preferably 0.3 parts by mass or more and 4 parts by mass or less, based on the total amount of the resin composition, and 0.4 parts by mass or more. 3 parts by mass or less is more preferable.
- the resin composition according to this embodiment may further contain a photoacid generator, a silane coupling agent, a leveling agent, an antifoaming agent, an antioxidant, an ultraviolet absorber, and the like.
- An onium salt having a structure of A + B ⁇ may be used as the photoacid generator.
- photoacid generators include sulfonium salts such as CPI-100P, 101A, 110P, 200K, 210S, 310B, 410S (manufactured by San-Apro Co., Ltd.), Omnicat 270 and 290 (manufactured by IGM Resins), CPI-IK- 1 (manufactured by San-Apro Co., Ltd.), Omnicat 250 (manufactured by IGM Resins), WPI-113, 116, 124, 169, 170 (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.).
- Silane coupling agents include, for example, tetramethylsilicate, tetraethylsilicate, mercaptopropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyltris( ⁇ -methoxy-ethoxy)silane, ⁇ -(3,4-epoxycyclohexyl).
- the viscosity of the resin composition according to the present embodiment at 25° C. is preferably 0.5 Pa s or more and 20 Pa s or less from the viewpoint of coatability, and 0.8 Pa s or more and 18 Pa s or less. more preferably 1.0 Pa ⁇ s or more and 15 Pa ⁇ s or less.
- the viscosity of the resin composition at 25° C. was measured using a Brookfield viscometer ("Digital Viscometer DV-II" manufactured by Brookfield) with spindle No. 18, it can be measured at a rotation speed of 10 rpm.
- the resin composition according to the present embodiment can achieve both a low Young's modulus and a high breaking strength, and does not cause defects in the primary resin layer. Therefore, it is possible to form a resin layer suitable for the primary coating of an optical fiber. .
- FIG. 1 is a schematic cross-sectional view showing an example of an optical fiber according to this embodiment.
- the optical fiber 10 includes a glass fiber 13 including a core 11 and a clad 12 , and a coating resin layer 16 including a primary resin layer 14 and a secondary resin layer 15 provided around the glass fiber 13 .
- the cladding 12 surrounds the core 11.
- the core 11 and the clad 12 mainly contain glass such as quartz glass.
- the core 11 may be germanium-doped quartz glass or pure quartz glass
- the clad 12 may be pure quartz glass or Quartz glass doped with fluorine can be used.
- the outer diameter (D2) of the glass fiber 13 is about 100 ⁇ m to 125 ⁇ m, and the diameter (D1) of the core 11 forming the glass fiber 13 is about 7 ⁇ m to 15 ⁇ m.
- the thickness of the coating resin layer 16 is usually about 22 ⁇ m to 70 ⁇ m.
- the thickness of each layer of the primary resin layer 14 and the secondary resin layer 15 may be about 5 ⁇ m to 50 ⁇ m.
- the thickness of each layer of the primary resin layer 14 and the secondary resin layer 15 may be about 10 ⁇ m to 50 ⁇ m.
- the thickness of the primary resin layer 14 may be 35 ⁇ m and the thickness of the secondary resin layer 15 may be 25 ⁇ m.
- the outer diameter of the optical fiber 10 may be approximately 245 ⁇ m to 265 ⁇ m.
- the thickness of each layer of the primary resin layer 14 and the secondary resin layer 15 may be about 8 ⁇ m to 38 ⁇ m.
- the thickness of the primary resin layer 14 may be 25 ⁇ m and the thickness of the secondary resin layer 15 may be 10 ⁇ m.
- the outer diameter of the optical fiber 10 may be about 165 ⁇ m to 221 ⁇ m.
- the thickness of each layer of the primary resin layer 14 and the secondary resin layer 15 may be about 5 ⁇ m to 32 ⁇ m.
- the thickness of the primary resin layer 14 may be 25 ⁇ m and the thickness of the secondary resin layer 15 may be 10 ⁇ m.
- the outer diameter of the optical fiber 10 may be about 144 ⁇ m to 174 ⁇ m.
- the method for manufacturing an optical fiber according to the present embodiment includes a coating step of coating the resin composition on the outer periphery of a glass fiber including a core and a clad, and curing the resin composition by irradiating ultraviolet rays after the coating step. and a curing step.
- the Young's modulus of the primary resin layer is preferably 0.8 MPa or less, more preferably 0.7 MPa or less at 23° C. ⁇ 2° C., from the viewpoint of improving the microbending resistance of the optical fiber. It is more preferably 5 MPa or less. When the Young's modulus of the primary resin layer exceeds 0.8 MPa, the external force is likely to be transmitted to the glass fiber, which may increase transmission loss due to microbending.
- the Young's modulus of the primary resin layer can be measured by the Pullout Modulus (POM) method at 23°C. Fix two locations of the optical fiber with two chuck devices, remove the coating resin layer (primary resin layer and secondary resin layer) portion between the two chuck devices, then fix one chuck device, and The chuck device is gently moved in the opposite direction of the fixed chuck device.
- L is the length of the portion sandwiched between the moving chuck devices in the optical fiber
- Z is the movement amount of the chuck
- Dp is the outer diameter of the primary resin layer
- Df is the outer diameter of the glass fiber
- Df is the Poisson's ratio of the primary resin layer.
- the secondary resin layer 15 can be formed, for example, by curing a resin composition containing a photopolymerizable compound containing urethane (meth)acrylate, a photopolymerization initiator, and the like.
- the resin composition forming the secondary resin layer has a different composition from the resin composition for the primary coating.
- a resin composition for the secondary coating can be prepared using conventionally known techniques.
- the Young's modulus of the secondary resin layer is preferably 800 MPa or higher, more preferably 1000 MPa or higher, and still more preferably 1200 MPa or higher at 23°C ⁇ 2°C.
- the upper limit of the Young's modulus of the secondary resin layer is not particularly limited, it may be 3000 MPa or less, 2500 MPa or less, or 2000 MPa or less at 23° C. ⁇ 2° C. from the viewpoint of imparting appropriate toughness to the secondary resin layer.
- the Young's modulus of the secondary resin layer can be measured by the following method. First, the optical fiber is immersed in a mixed solvent of acetone and ethanol, and only the coating resin layer is pulled out in a cylindrical shape. At this time, the primary resin layer and the secondary resin layer are integrated, but since the Young's modulus of the primary resin layer is 1/1000 or more and 1/10000 or less of that of the secondary resin layer, the Young's modulus of the primary resin layer can be ignored. Next, after the solvent is removed from the coating resin layer by vacuum drying, a tensile test is performed at 23° C. (at a tensile speed of 1 mm/min), and the Young's modulus can be obtained by the secant formula of 2.5% strain.
- the method for producing an optical fiber according to the present embodiment can produce an optical fiber having excellent microbending resistance and low-temperature properties by using the resin composition according to the present embodiment as the resin composition for the primary coating. can.
- optical fiber ribbon An optical fiber ribbon can be produced using the optical fiber according to the present embodiment.
- An optical fiber ribbon is formed by arranging a plurality of the above optical fibers in parallel and coating them 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 10 and a connecting resin layer 40 in which the optical fibers 10 are (integrally) coated with ribbon resin and connected.
- FIG. 2 shows four optical fibers 10 as an example, but the number is not particularly limited.
- FIG. 3 is a schematic cross-sectional view showing an example of an optical fiber ribbon in which optical fibers are arranged side by side at regular intervals and integrated.
- the optical fiber ribbon 100A shown in FIG. 3 has 12 optical fibers 10 connected at regular intervals by ribbon resin.
- the ribbon resin forms the connecting resin layer 40 .
- a resin material generally known as a ribbon material can be used as the ribbon resin.
- the ribbon resin may be 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. It may contain a mold resin.
- the thickness of the connecting portion at the center between the optical fibers 10 is , 150 ⁇ m or more and 220 ⁇ m or less. Since the optical fiber ribbon is easily deformed when it is housed in the cable, the optical fiber ribbon may have depressions at the connecting portions of the optical fibers. The recess may be formed in a triangular shape with a narrower angle on one surface of the connecting portion.
- the optical fiber ribbon according to this embodiment may have intermittent connected portions and non-connected portions in the longitudinal direction and width direction.
- FIG. 4 is a plan view showing the appearance of an optical fiber ribbon according to one embodiment.
- the optical fiber ribbon 100B has a plurality of optical fibers, a plurality of connecting portions 20, and non-connecting portions (dividing portions) 21. As shown in FIG.
- the non-connecting portions 21 are intermittently formed in the longitudinal direction of the optical fiber ribbon.
- the optical fiber ribbon 100B is an intermittently connected optical fiber ribbon in which a connecting portion 20 and a non-connecting portion 21 are provided intermittently in the longitudinal direction for every two optical fibers 10A.
- a “connected portion” is a portion where adjacent optical fibers are integrated via a connecting resin layer
- a “non-connected portion” is a portion where adjacent optical fibers are not integrated via a connecting resin layer. , refers to the portion where there is a gap between the optical fibers.
- the non-connecting portions 21 are intermittently provided in the connecting portions 20 provided every two cores, so the optical fiber ribbon is easily deformed. Therefore, when the optical fiber ribbon is mounted on the optical fiber cable, the optical fiber ribbon can be easily rolled and mounted, so that the optical fiber ribbon can be made suitable for high-density mounting. In addition, since the connecting portion 20 can be easily torn from the non-connecting portion 21 as a starting point, the single core separation of the optical fibers 10 in the optical fiber ribbon is facilitated.
- the optical fiber ribbon according to the present embodiment is excellent in microbending resistance and low temperature characteristics, and can be densely filled in the optical fiber cable.
- the optical fiber ribbon is housed inside the cable.
- An example of the optical fiber cable is a slot-type optical fiber cable having a plurality of slot grooves.
- the optical fiber ribbons can be mounted in the slot grooves so that the mounting density in each slot groove is about 25% to 65%.
- Packing density refers to the ratio of the cross-sectional area of the optical fiber ribbon mounted in the slot groove to the cross-sectional area of the slot groove.
- the optical fiber cable according to this embodiment may be arranged such that the plurality of optical fibers are housed in the cable without being coated with the ribbon resin.
- optical fiber cable An example of the optical fiber cable according to this embodiment will be described with reference to FIGS. 5 and 6, an intermittently connected optical fiber ribbon is stored, but a plurality of optical fibers that are not coated with ribbon resin may be stored in a bundled state.
- FIG. 5 is a schematic cross-sectional view of a slotless type optical fiber cable 60 that uses the intermittent connection type optical fiber ribbon 100B described above.
- the optical fiber cable 60 has a cylindrical tube 61 and a plurality of optical fiber ribbons 100B.
- a plurality of optical fiber ribbons 100B may be bundled with an interposer 62 such as an aramid fiber.
- the plurality of optical fiber ribbons 100B may have different markings.
- the optical fiber cable 60 has a structure in which a plurality of bundled optical fiber ribbons 100B are twisted together, a resin that forms a tube 61 is extruded around the bundled optical fiber ribbons 100B, and a jacket 64 is placed together with a tension member 63. .
- a water absorbing yarn may be inserted inside the tube 61 if waterproofness is required.
- the tube 61 can be formed using resin such as polybutylene terephthalate and high-density polyethylene.
- a tear string 65 may be provided on the outside of the tube 61 .
- FIG. 6 is a schematic cross-sectional view of a slot-type optical fiber cable 70 that uses the intermittent connection-type optical fiber ribbon 100B described above.
- the optical fiber cable 70 has a slot rod 72 with a plurality of slot grooves 71 and a plurality of optical fiber ribbons 100B.
- the optical fiber cable 70 has a structure in which a slot rod 72 having a tension member 73 in the center is provided with a plurality of radial slot grooves 71 .
- the plurality of slot grooves 71 may be provided in a shape twisted in a spiral or SZ shape in the longitudinal direction of the optical fiber cable 70 .
- Each slot groove 71 accommodates a plurality of optical fiber ribbons 100B separated from a parallel state and brought into a dense state.
- Each optical fiber ribbon 100B may be bundled with a bundle material for identification.
- a hold-down tape 74 is wound around the slot rod 72 , and a jacket 75 is formed around the hold-down tape 74 .
- An optical fiber cable comprising an optical fiber or optical fiber ribbon according to this embodiment is excellent in microbending resistance and low temperature characteristics.
- A-2 Polypropylene glycol having an Mn of 18,000 and Karenz AOI were reacted at an NCO/OH ratio of 0.85 at 60° C. for 1 hour to obtain a urethane acrylate (A-2) having an Mn of 25,000.
- A-2 urethane acrylate
- 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- Polypropylene glycol having an Mn of 18000 and Karenz AOI were reacted at an NCO/OH ratio of 0.5 at 60°C for 1 hour to obtain a urethane acrylate (A-3) having an Mn of 24900.
- A-3 urethane acrylate
- 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- A-4 Polypropylene glycol of Mn 18000, Karenz AOI and 3-(triethoxysilyl)propyl isocyanate were mixed with 3-(triethoxysilyl)propyl isocyanate at a molar ratio (NCO/OH) of NCO of Karenz AOI to polypropylene glycol OH of 0.85.
- NCO/OH molar ratio of NCO of isocyanate to OH of polypropylene polyol
- reaction was carried out at 60° C. for 1 hour to obtain urethane acrylate (A-4) with Mn of 25,100.
- As a catalyst 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- A-5) Polypropylene glycol having an Mn of 12,000 and Karenz AOI were reacted at an NCO/OH ratio of 1.0 at 60° C. for 1 hour to obtain a urethane acrylate (A-5) having an Mn of 18,300.
- a catalyst 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- a polyoxypropylene triol having an Mn of 10,000 and Karenz AOI were reacted at an NCO/OH ratio of 0.6 at 60° C. for 1 hour to obtain a urethane acrylate (A-6) having an Mn of 15,000.
- 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- NCO-terminated prepolymer was prepared by reacting polypropylene glycol of Mn 12000 with TDI at an NCO/OH of 2.0 at 60° C. for 1 hour. As a catalyst, 200 ppm of dibutyltin dilaurate was added to the final total charged amount. Next, HEA was added so that the OH molar ratio of HEA to NCO of the NCO-terminated prepolymer was 1.05, and the mixture was reacted at 60° C. for 1 hour to produce urethane acrylate (B-2) with Mn 24,500. got
- NCO-terminated prepolymer was prepared by reacting polypropylene glycol of Mn 3000 with TDI at an NCO/OH ratio of 1.5 at 60° C. for 1 hour. As a catalyst, 200 ppm of dibutyltin dilaurate was added to the final total charged amount. Next, HEA was added so that the OH molar ratio of HEA to NCO of the NCO-terminated prepolymer was 1.05, and the mixture was reacted at 60° C. for 1 hour to produce urethane acrylate (B-3) with Mn 11300. got
- C-2 Polyoxypropylene monobutyl ether of Mn 3070 (manufactured by Sanyo Kasei Co., Ltd., trade name "Newpol LB3000") and TDI are reacted at an NCO/OH ratio of 2.0 at 60°C for 1 hour to prepare an NCO-terminated prepolymer. did.
- As a catalyst 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- HEA was added so that the OH molar ratio of HEA to NCO of the NCO-terminated prepolymer was 1.05, and the mixture was reacted at 60° C. for 1 hour to produce a urethane acrylate (C-2) of Mn 8900. got
- C-3 Polyoxypropylene monobutyl ether of Mn 5000 (trade name "Acrobut MB-90" manufactured by NOF Corporation) and TDI are reacted at an NCO/OH ratio of 2.0 at 60 ° C. for 1 hour to obtain an NCO-terminated prepolymer. was prepared. As a catalyst, 200 ppm of dibutyltin dilaurate was added to the final total charged amount. Next, HEA was added so that the OH molar ratio of HEA to NCO of the NCO-terminated prepolymer was 1.05, and the mixture was reacted at 60° C. for 1 hour to produce urethane acrylate (C-3) with Mn of 10,000. got
- C-4 Acrobut MB-90 and Karenz AOI were reacted at a molar ratio of NCO to OH (NCO/OH) of 1.0 at 60° C. for 1 hour to obtain urethane acrylate (C-4) with Mn of 8500.
- NCO/OH molar ratio of NCO to OH
- Mn Mn of 8500.
- 200 ppm of dibutyltin dilaurate was added to the final total charged amount.
- the Mn of polypropylene polyol and polyoxyalkylene monoalkyl ether is the value obtained from the hydroxyl value and is the value described in the catalog for each product.
- Mn of urethane acrylate was measured using Waters' ACQUITY APC RI system, sample concentration: 0.2% by mass THF solution, injection volume: 20 ⁇ L, sample temperature: 15°C, mobile phase: THF, XT column for organic solvents: particles Diameter 2.5 ⁇ m, pore size 450 ⁇ , column inner diameter 4.6 ⁇ column length 150 mm + particle diameter 2.5 ⁇ m, pore size 125 ⁇ , column inner diameter 4.6 ⁇ column length 150 mm + particle diameter 1.7 ⁇ m, pore size 45 ⁇ , column inner diameter 4.6 ⁇ Measurement was performed under the conditions of column length of 150 mm, column temperature of 40° C., and flow rate of 0.8 mL/min.
- nonylphenol polyethylene glycol acrylate (trade name "Aronix M-113” manufactured by Toagosei Co., Ltd.), isobornyl acrylate (IBXA), N-vinylcaprolactam (NVCL), acryloylmorpholine (ACMO), bisphenol A epoxy di( Meth)acrylate (trade name “Viscoat #540” manufactured by Osaka Organic Chemical Industry Co., Ltd.) and tripropylene glycol diacrylate (TPGDA) were prepared.
- IBXA isobornyl acrylate
- NVCL N-vinylcaprolactam
- ACMO acryloylmorpholine
- TPGDA tripropylene glycol diacrylate
- UV-polymerization initiators 2,4,6-trimethylbenzoyldiphenylphosphine oxide (Omnirad TPO) and 1-hydroxycyclohexylphenyl ketone (Omnirad 184) were prepared.
- a photopolymerizable compound, a photopolymerization initiator, and a silane coupling agent are mixed in the amounts (parts by mass) shown in Table 1, Table 2, or Table 3 to prepare a resin composition for primary coating of each test example. made.
- Test Examples 1 to 13 correspond to Examples, and Test Examples 14 to 17 correspond to Comparative Examples.
- viscosity The viscosity of the resin composition at 25° C. was measured using a Brookfield viscometer (“Digital viscometer DV-II” manufactured by Brookfield) with a spindle No. 18, measured at a rotation speed of 10 rpm.
- the resin film is punched into a dumbbell shape of JIS K 7127 type 5, and is pulled under the conditions of 23 ⁇ 2 ° C. and 50 ⁇ 10% RH at a tensile speed of 1 mm / min and a gauge line distance of 25 mm using a tensile tester. , to obtain the stress-strain curve.
- the Young's modulus of the resin film was obtained by dividing the stress obtained by the secant formula at 2.5% strain by the cross-sectional area of the resin film.
- the resin film is punched out into a dumbbell shape of JIS K 7127 type 5, and under the conditions of 23 ⁇ 2 ° C. and 50 ⁇ 10% RH, a tensile tester is used at a tensile speed of 50 mm / min and a gauge line distance of 25 mm. , to obtain the stress-strain curve.
- the breaking strength of the resin film was determined by dividing the stress at break by the cross-sectional area of the resin film. Further, the elongation at break of the resin film was obtained by dividing the displacement at break between the marked lines.
- NCO-terminated prepolymer was prepared by reacting polypropylene glycol of Mn 600 with TDI at an NCO/OH ratio of 2.0. 200 ppm of dibutyltin dilaurate was added to the final total charge. Next, HEA was added so that the molar ratio of OH of 2-hydroxyethyl acrylate (HEA) to NCO of the NCO-terminated prepolymer was 1.05, and the mixture was reacted at 60° C. for 1 hour to obtain an Mn of 2200. A urethane acrylate (Z-1) was obtained.
- HEA 2-hydroxyethyl acrylate
- a primary coating resin composition and a secondary coating resin composition were applied to the outer peripheral surface of a glass fiber 13 having a diameter of 125 ⁇ m. Then, each resin composition was cured by irradiating with ultraviolet rays to form a coating resin layer 16 having a primary resin layer 14 and a secondary resin layer 15, and an optical fiber 10 was produced. An optical fiber having an outer diameter of 195 ⁇ m was obtained by setting the thickness of the primary resin layer 14 to 20 ⁇ m and the thickness of the secondary resin layer 15 to 15 ⁇ m.
- the transmission loss of light with a wavelength of 1550 nm was measured by an OTDR (Optical Time Domain Reflectometer) method when the optical fiber 10 was wound in a single layer on a bobbin with a diameter of 280 mm covered with sandpaper.
- "A" indicates that the difference in transmission loss of light with a wavelength of 1550 nm when the optical fiber 10 is wound in a single layer around a bobbin of 280 mm diameter without sandpaper is less than 0.5 dB/km, and 0.5 dB/km or more.
- a case of 1.0 dB/km or less was evaluated as "B”
- a case of more than 1.0 dB/km was evaluated as "C”.
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Abstract
Description
本出願は、2021年2月4日出願の日本出願第2021-016587号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
プライマリ被覆用の樹脂組成物は、ヤング率を低くするにつれて、破断強度も低下する傾向があり、プライマリ樹脂層に欠陥(ボイド)が生じて、特に低温において伝送損失の増加を招き易くなる。
本開示によれば、低ヤング率と高破断強度を両立する、光ファイバのプライマリ被覆に好適な樹脂層を形成することができる樹脂組成物、及び耐マイクロベンド特性と低温特性に優れる光ファイバを提供することができる。
最初に、本開示の実施形態の内容を列記して説明する。本開示の一態様に係る光ファイバのプライマリ被覆用樹脂組成物は、数平均分子量8000以上20000以下のポリプロピレンポリオールと、イソシアネート基含有(メタ)アクリレートとの反応物を含むウレタン(メタ)アクリレート(A)を含む光重合性化合物と、光重合開始剤と、を含有する。
本実施形態に係る樹脂組成物及び光ファイバの具体例を、必要により図面を参照しつつ説明する。なお、本開示はこれらの例示に限定されず、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。以下の説明では、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。本明細書における(メタ)アクリレートとは、アクリレート又はそれに対応するメタクリレートを意味し、(メタ)アクリロイル等の他の類似表現についても同様である。
本実施形態に係る樹脂組成物は、数平均分子量(Mn)8000以上20000以下のポリプロピレンポリオールと、イソシアネート基含有(メタ)アクリレートとの反応物を含むウレタン(メタ)アクリレート(A)を含む光重合性化合物と、光重合開始剤とを含有する。ウレタン(メタ)アクリレート(A)は、Mnが8000以上20000以下のポリプロピレンポリオールに由来するオキシプロピレン鎖と、イソシアネート基含有(メタ)アクリレートに由来する(メタ)アクリロイル基とを有している。ウレタン(メタ)アクリレート(A)を用いることにより、プライマリ樹脂層の低ヤング率と高破断強度を両立することができる。
AI-U-PO-U-AI (1)
AI-U-PO-OH (2)
AI-U-PO-SC (3)
AH-(U-I-U-PO)n-U-I-U-AH (4)
AH-U-I-U-AH (5)
AH-U-I-U-P1 (6)
AI-U-P1 (7)
Mn=56.1×官能基数×1000/水酸基価
図1は、本実施形態に係る光ファイバの一例を示す概略断面図である。光ファイバ10は、コア11及びクラッド12を含むガラスファイバ13と、ガラスファイバ13の外周に設けられたプライマリ樹脂層14及びセカンダリ樹脂層15を含む被覆樹脂層16とを備えている。
ヤング率(MPa)=((1+n)W/πLZ)×ln(Dp/Df)
本実施形態に係る光ファイバを用いて光ファイバリボンを作製することができる。光ファイバリボンは、上記光ファイバが複数並列され、リボン用樹脂で被覆されている。
本実施形態に係る光ファイバケーブルは、上記光ファイバリボンがケーブル内に収納されている。光ファイバケーブルとしては、例えば、複数のスロット溝を有するスロット型の光ファイバケーブルが挙げられる。スロット溝内には、上記光ファイバリボンを、各スロット溝における実装密度が25%から65%程度となるように実装することができる。実装密度とは、スロット溝の断面積に対するスロット溝内に実装される光ファイバリボンの断面積の割合を意味する。本実施形態に係る光ファイバケーブルは、上記複数の光ファイバをリボン用樹脂で被覆せずにケーブル内に収納した態様であってもよい。
(A-1)
Mn18000のポリプロピレングリコールと2-アクリロイルオキシエチルイソシアネート(昭和電工株式会社製の商品名「カレンズAOI」)とを、NCOとOHのモル比(NCO/OH)が1.0で、60℃で1時間反応させ、Mn25100のウレタンアクリレート(A-1)を得た。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。
Mn18000のポリプロピレングリコールとカレンズAOIとを、NCO/OHが0.85で、60℃で1時間反応させ、Mn25000のウレタンアクリレート(A-2)を得た。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。
Mn18000のポリプロピレングリコールとカレンズAOIと3-(トリエトキシシリル)プロピルイソシアネートとを、カレンズAOIのNCOとポリプロピレングリコールOHのモル比(NCO/OH)が0.85で、3-(トリエトキシシリル)プロピルイソシアネートのNCOとポリプロピレンポリオールのOHのモル比(NCO/OH)が0.15で、60℃で1時間反応させ、Mn25100のウレタンアクリレート(A-4)を得た。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。
Mn12000のポリプロピレングリコールとカレンズAOIとを、NCO/OHが1.0で、60℃で1時間反応させ、Mn18300のウレタンアクリレート(A-5)を得た。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。
(A-6)
Mn10000のポリオキシプロピレントリオールとカレンズAOIとを、NCO/OHが0.6で、60℃で1時間反応させ、Mn15000のウレタンアクリレート(A-6)を得た。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。
(B-1)
Mn18000のポリプロピレングリコールと2,4-トリレンジイソシアネート(TDI)とを、NCO/OHが2.0で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、2-ヒドロキシエチルアクリレート(HEA)のOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn36700のウレタンアクリレート(B-1)を得た。
Mn12000のポリプロピレングリコールとTDIとを、NCO/OHが2.0で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、HEAのOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn24500のウレタンアクリレート(B-2)を得た。
Mn3000のポリプロピレングリコールとTDIとを、NCO/OHが1.5で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、HEAのOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn11300のウレタンアクリレート(B-3)を得た。
(C-1)
Mn2300のポリオキシプロピレンモノブチルエーテル(日油株式会社製の商品名「ユニルーブMB-370」)とTDIとを、NCO/OHが2.0で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、HEAのOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn6200のウレタンアクリレート(C-1)を得た。
Mn3070のポリオキシプロピレンモノブチルエーテル(三洋化成株式会社製の商品名「ニューポールLB3000」)とTDIとを、NCO/OHが2.0で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、HEAのOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn8900のウレタンアクリレート(C-2)を得た。
Mn5000のポリオキシプロピレンモノブチルエーテル(日油株式会社製の商品名「アクロビュートMB-90」)とTDIとを、NCO/OHが2.0で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、HEAのOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn10000のウレタンアクリレート(C-3)を得た。
アクロビュートMB-90とカレンズAOIとを、NCOとOHのモル比(NCO/OH)が1.0で、60℃で1時間反応させて、Mn8500のウレタンアクリレート(C-4)を得た。触媒として、ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。
(Y-1)
Mn3000のポリプロピレングリコールとTDIとをNCO/OHが1.5で、60℃で1時間反応させ、NCO末端プレポリマーを調製した。ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、OHのモル比が0.4となるようにメタノールを、OHのモル比が0.65となるようにHEAを添加し、60℃で1時間反応させて、Mn11200のウレタンアクリレート(Y-1)を得た。
表1、表2又は表3に示す配合量(質量部)で、光重合性化合物、光重合開始剤、及びシランカップリング剤を混合して、各試験例のプライマリ被覆用の樹脂組成物を作製した。試験例1~13は、実施例に相当し、試験例14~17は比較例に相当する。
樹脂組成物の25℃における粘度を、B型粘度計(ブルックフィールド社製の「デジタル粘度計DV-II」)を用いて、スピンドル:No.18、回転数10rpmの条件で測定した。
スピンコータを用いて、樹脂組成物をポリエチレンテレフタレート(PET)フィルムの上に塗布した後、無電極UVランプシステム(Dバルブ、ヘレウス製)を用いて、10mJ/cm2及び100mW/cm2の条件で硬化させ、PETフィルム上に厚み200μmの樹脂フィルムを形成した。PETフィルムから剥がし、樹脂フィルムを得た。
樹脂フィルムをJIS K 7127 タイプ5のダンベル形状に打ち抜き、23±2℃、50±10%RHの条件下で、引張試験機を用いて1mm/分の引張速度、標線間25mmの条件で引張り、応力-歪み曲線を得た。2.5%歪の割線式により求めた応力を樹脂フィルムの断面積で割ることで、樹脂フィルムのヤング率を求めた。
樹脂フィルムをJIS K 7127 タイプ5のダンベル形状に打ち抜き、23±2℃、50±10%RHの条件下で、引張試験機を用いて50mm/分の引張速度、標線間25mmの条件で引張り、応力-歪み曲線を得た。破断時の応力を樹脂フィルムの断面積で割ることで、樹脂フィルムの破断強度を求めた。また、破断時の変位を標線間で割ることで、樹脂フィルムの破断伸びを求めた。
Mn600のポリプロピレングリコールとTDIとをNCO/OHが2.0で反応させ、NCO末端プレポリマーを調製した。ジブチルスズジラウレートを最終的な全仕込み量に対して、200ppm添加した。次に、NCO末端プレポリマーのNCOに対して、2-ヒドロキシエチルアクリレート(HEA)のOHのモル比が1.05となるようにHEAを添加し、60℃で1時間反応させて、Mn2200のウレタンアクリレート(Z-1)を得た。
直径125μmのガラスファイバ13の外周面に、プライマリ被覆用の樹脂組成物とセカンダリ被覆用の樹脂組成物とをそれぞれ塗布した。次いで、紫外線を照射することでそれぞれの樹脂組成物を硬化し、プライマリ樹脂層14及びセカンダリ樹脂層15を備える被覆樹脂層16を形成し、光ファイバ10を作製した。プライマリ樹脂層14の厚さを20μm、セカンダリ樹脂層15の厚さを15μmとし、外径195μmの光ファイバを得た。
サンドペーパーで表面を覆った280mm径のボビンに、光ファイバ10を単層状に巻き付けた時の1550nmの波長の光の伝送損失を、OTDR(Optical Time Domain Reflectometer)法により測定した。また、サンドペーパーのない280mm径のボビンに、光ファイバ10を単層状に巻き付けた時の1550nmの波長の光の伝送損失差が0.5dB/km未満を「A」、0.5dB/km以上1.0dB/km以下の場合を「B」、1.0dB/kmを超える場合を「C」と評価した。
ガラスボビンに張力50gで一層巻に光ファイバを巻き付け、23℃及び-40℃のそれぞれの温度条件下で、波長1550nmの信号光の伝送特性を測定し、23℃と-40℃とでの伝送損失を求めた。-40℃での伝送損失から23℃での伝送損失を引いた伝送損失差が0dB未満を「A」、0dB以上0.01dB/km以下の場合を「B」、0.01dB/km超の場合を「C」と評価した。
11 コア
12 クラッド
13 ガラスファイバ
14 プライマリ樹脂層
15 セカンダリ樹脂層
16 被覆樹脂層
20 連結部
21 非連結部
40 連結樹脂層
60,70 光ファイバケーブル
61 円筒型のチューブ
62 介在
63,73 テンションメンバ
64,75 外被
65 引き裂き紐
71 スロット溝
72 スロットロッド
74 押さえ巻きテープ
100,100A,100B 光ファイバリボン
Claims (11)
- 数平均分子量8000以上20000以下のポリプロピレンポリオールと、イソシアネート基含有(メタ)アクリレートとの反応物を含むウレタン(メタ)アクリレートを含む光重合性化合物と、
光重合開始剤と、を含有する、光ファイバのプライマリ被覆用の樹脂組成物。 - 前記ウレタン(メタ)アクリレートが、数平均分子量8000以上20000以下のポリプロピレンポリオールと、イソシアネート基含有(メタ)アクリレートと、イソシアネート基含有シラン化合物との反応物を更に含む、請求項1に記載の樹脂組成物。
- 前記光重合性化合物が、数平均分子量2000以上20000以下のポリプロピレンポリオールと、ジイソシアネートと、水酸基含有(メタ)アクリレートとの反応物であるウレタン(メタ)アクリレートを更に含む、請求項1又は請求項2に記載の樹脂組成物。
- 前記ポリプロピレンポリオールの数平均分子量が、6000以上20000以下である、請求項3に記載の樹脂組成物。
- 前記光重合性化合物が、ポリオキシアルキレンモノアルキルエーテルと、ジイソシアネートと、水酸基含有(メタ)アクリレートとの反応物、又はポリオキシアルキレンモノアルキルエーテルと、イソシアネート基含有(メタ)アクリレートとの反応物であるウレタン(メタ)アクリレートを更に含む、請求項1から請求項4のいずれか一項に記載の樹脂組成物。
- 前記ポリオキシアルキレンモノアルキルエーテルの数平均分子量が、2000以上10000以下である、請求項5に記載の樹脂組成物。
- コア及びクラッドを含むガラスファイバと、
前記ガラスファイバに接して前記ガラスファイバを被覆するプライマリ樹脂層と、
前記プライマリ樹脂層を被覆するセカンダリ樹脂層と、を備え、
前記プライマリ樹脂層が、請求項1から請求項6のいずれか一項に記載の樹脂組成物の硬化物を含む、光ファイバ。 - コア及びクラッドを含むガラスファイバの外周に、請求項1から請求項6のいずれか一項に記載の樹脂組成物を塗布する塗布工程と、
前記塗布工程の後に紫外線を照射することにより前記樹脂組成物を硬化させる硬化工程と、
を含む、光ファイバの製造方法。 - 請求項7に記載の光ファイバが複数並列され、リボン用樹脂で被覆された、光ファイバリボン。
- 請求項9に記載の光ファイバリボンが、ケーブル内に収納された、光ファイバケーブル。
- 請求項7に記載の光ファイバが、ケーブル内に複数収納された、光ファイバケーブル。
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