WO2017122589A1 - 光ファイバ心線及び光ファイバテープ心線 - Google Patents
光ファイバ心線及び光ファイバテープ心線 Download PDFInfo
- Publication number
- WO2017122589A1 WO2017122589A1 PCT/JP2017/000258 JP2017000258W WO2017122589A1 WO 2017122589 A1 WO2017122589 A1 WO 2017122589A1 JP 2017000258 W JP2017000258 W JP 2017000258W WO 2017122589 A1 WO2017122589 A1 WO 2017122589A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin layer
- optical fiber
- core wire
- coating resin
- fiber core
- Prior art date
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 85
- 239000011347 resin Substances 0.000 claims abstract description 106
- 229920005989 resin Polymers 0.000 claims abstract description 106
- 239000011248 coating agent Substances 0.000 claims abstract description 58
- 238000000576 coating method Methods 0.000 claims abstract description 58
- 239000003365 glass fiber Substances 0.000 claims abstract description 45
- 238000003860 storage Methods 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 5
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- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
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- 238000005253 cladding Methods 0.000 abstract description 5
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- LWRBVKNFOYUCNP-UHFFFAOYSA-N 2-methyl-1-(4-methylsulfanylphenyl)-2-morpholin-4-ylpropan-1-one Chemical compound C1=CC(SC)=CC=C1C(=O)C(C)(C)N1CCOCC1 LWRBVKNFOYUCNP-UHFFFAOYSA-N 0.000 description 4
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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 4
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Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/02—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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Definitions
- the present invention relates to an optical fiber core and an optical fiber tape core.
- an optical fiber core has a coating resin layer for protecting a glass fiber.
- the optical fiber core may be used in the form of an optical fiber ribbon in which a plurality of optical fiber cores are juxtaposed and covered with a tape material. And when connecting an optical fiber ribbon, it is necessary to remove a part of tape material from glass fiber with a coating resin layer collectively. When the tape material is collectively removed from the glass fiber, a part of the coating resin layer may remain on the outer periphery of the glass fiber.
- Patent Document 1 discusses providing an optical fiber ribbon in which the difference in glass transition temperature of each coating material covering the glass fiber is adjusted.
- An optical fiber core includes a glass fiber having a core and a clad covering the core, and a coating resin layer covering the glass fiber, at 85 ° C. between the glass fiber and the coating resin layer.
- X is 0.2 to 0.6 kgf
- y is 600 to 6000 MPa
- y is the storage elastic modulus at 100 ° C. and frequency 11 Hz of the coating resin layer, where x is the adhesion force, and y is 600 to 6000 MPa.
- the relationship represented by (I) is satisfied. y> 222.1e 4.7799x (I)
- an object of the present disclosure is to provide an optical fiber core wire and an optical fiber tape core wire that are excellent in tape batch removal property.
- An optical fiber core according to an embodiment of the present invention includes a glass fiber and a coating resin layer covering the glass fiber, and an adhesive force at 100 ° C. between the glass fiber and the coating resin layer is x, and the coating resin
- x is 0.2 to 0.6 kgf
- y is 600 to 6000 MPa
- the present inventors have found that the force (pull-out force) at the time of peeling off the coating resin layer from the optical fiber core and the storage elastic modulus of the coating resin layer have a correlation, leading to the present invention.
- the optical fiber core wire of the present embodiment is an optical fiber tape core wire in which the adhesion between the glass fiber and the coating resin layer and the storage elastic modulus of the coating resin layer satisfy a specific relationship. When used in the above, it is excellent in tape batch removability that removes a part of the tape material together with the coating resin layer from the glass fiber.
- the outer diameter of the optical fiber core may be 190 to 260 ⁇ m or 190 to 210 ⁇ m.
- the outer diameter of the optical fiber core is usually about 250 ⁇ m, but may be thinner.
- the outer diameter of the colored optical fiber core wire may be 260 ⁇ m or less. From the viewpoint of increasing the number of cores of the optical cable, the outer diameter of the colored optical fiber core may be 210 ⁇ m or less. Since the coating resin layer needs to have a certain thickness in order to give mechanical strength to the optical fiber core, the outer diameter of the colored optical fiber core is preferably 185 ⁇ m or more.
- the covering resin layer has a primary resin layer and a secondary resin layer, and the primary resin layer includes a cured product of an ultraviolet curable resin composition containing a polyfunctional monomer. You may go out. Thereby, the balance between the breaking strength and the Young's modulus of the primary resin layer is improved, and the coating residue is hardly left when the coating resin layer is removed from the glass fiber.
- the ultraviolet curable resin composition may further contain a silane coupling agent. Thereby, it becomes easy to adjust the adhesive force between the glass fiber and the primary resin layer.
- An optical fiber ribbon according to an embodiment of the present invention is covered with a tape material by arranging a plurality of the above optical fibers in parallel. Since the optical fiber core wire of the present embodiment is used, the tape batch removability at the time of connection is excellent.
- the glass transition temperature of the tape material may be 60 ° C. or higher. As a result, the optical fiber ribbon is more excellent in the collective removal of the tape.
- FIG. 1 is a cross-sectional view showing an example of an optical fiber core wire 1 according to this embodiment.
- the optical fiber core wire 1 of the present embodiment includes a glass fiber 10 that is an optical transmission body and a coating resin layer 20.
- Glass fiber 10 has a core 12 and a cladding 14 made of glass members, for example, made of SiO 2 glass.
- the glass fiber 10 transmits light introduced into the optical fiber core wire 1.
- the core 12 is provided in a region including the central axis of the glass fiber 10.
- the core 12 may contain pure SiO 2 glass, or GeO 2 , fluorine element, or the like.
- 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.
- Cladding 14 may be made of pure SiO 2 glass, it may be made of SiO 2 glass which fluorine element is added.
- the diameter of the glass fiber 10 is usually about 125 ⁇ m.
- the total thickness of the coating resin layer 20 is preferably 32.5 to 67.5 ⁇ m, and may be 32.5 to 42.5 ⁇ m.
- the outer diameter of the optical fiber core 1 is preferably 190 to 260 ⁇ m, and may be 190 to 210 ⁇ m.
- the covering resin layer 20 is composed of a plurality of layers, and includes a primary resin layer 22 that is at least a first layer in contact with the glass fiber, and a secondary resin layer 24 that is a second layer in contact with the first layer. have.
- the coating resin layer 20 is composed of two layers, as shown in FIG. 1, the coating resin layer 20 includes a primary resin layer 22 that is a first layer and a secondary resin layer 24 that is a second layer. Composed.
- the Young's modulus of the primary resin layer 22 is preferably 1.0 MPa or less at 23 ° C., more preferably 0.8 MPa or less, and still more preferably 0.7 MPa or less.
- the lower limit of the Young's modulus of the primary resin layer 22 is not particularly limited, but is about 0.1 MPa.
- the adhesion (x) at 100 ° C. between the glass fiber 10 and the coating resin layer 20 is 0.2 to 0.6 kgf, preferably 0.3 to 0.5 kgf.
- the storage elastic modulus (y) of the coating resin layer at 85 ° C. and a frequency of 11 Hz is 600 to 6000 MPa, and preferably 700 to 5600 MPa.
- x and y satisfy the relationship represented by the following formula (I). y> 222.1e 4.7799x (I)
- the resin composition for forming a secondary resin layer is used as the primary resin layer 22.
- a method (wet-on-dry method) may be used in which the secondary resin layer 24 is formed by being applied around the substrate and cured by irradiation with ultraviolet rays.
- the resin composition for forming the primary resin layer is applied around the clad 14
- the resin composition for forming the secondary resin layer is applied around the clad 14, and simultaneously cured by irradiation with ultraviolet rays, and the primary resin layer 22 and A method of forming the secondary resin layer 24 (wet-on-wet method) may be used.
- a colored layer serving as an ink layer may be formed on the outer peripheral surface of the secondary resin layer 24 constituting the coating resin layer 20 in order to identify the optical fiber core wire.
- the secondary resin layer 24 may be colored to form a colored layer (hereinafter referred to as “colored secondary resin layer”). That is, when the outermost layer of the coating resin layer 20 is a colored layer (an optical fiber having an ink layer or a colored secondary resin layer), a colored optical fiber is formed.
- the outer diameter of the colored optical fiber may be 210 ⁇ m or less.
- the outer diameter of the colored optical fiber core is preferably 185 ⁇ m or more.
- the outer diameter of the optical fiber core excluding the ink layer is desirably 200 ⁇ m or less, and desirably 180 ⁇ m or more.
- the colored layer preferably contains a pigment from the viewpoint of improving the discriminability of the optical fiber core wire.
- the pigment include color pigments such as carbon black, titanium oxide, zinc white, ⁇ -Fe 2 O 3 , mixed crystals of ⁇ -Fe 2 O 3 and ⁇ -Fe 3 O 4 , CrO 2 , cobalt ferrite, cobalt Deposited iron oxide, barium ferrite, magnetic powder such as Fe—Co, Fe—Co—Ni, inorganic pigments such as MIO, zinc chromate, strontium chromate, aluminum tripolyphosphate, zinc, alumina, glass, mica; azo pigment, Examples thereof include organic pigments such as phthalocyanine pigments and dyed lake pigments. The pigment may be subjected to various surface modification and complex pigmentation treatments.
- the coating resin layer 20 can be formed, for example, by curing an ultraviolet curable resin composition containing an oligomer, a monomer, and a photopolymerization initiator.
- Examples of the oligomer include urethane (meth) acrylate. Two or more kinds of oligomers may be mixed and used.
- (meth) acrylate means an acrylate or a corresponding methacrylate. The same applies to (meth) acrylic acid.
- Examples of urethane (meth) acrylate include those obtained by reacting a polyol compound, a polyisocyanate compound, and a hydroxyl group-containing acrylate compound.
- Examples of the polyol compound include polytetramethylene glycol, polypropylene glycol, and bisphenol A / ethylene oxide addition diol.
- Examples of the polyisocyanate compound include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and isophorone diisocyanate.
- hydroxyl group-containing acrylate compound examples include 2-hydroxymethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 1,6-hexanediol mono (meth) acrylate, and pentaerythritol.
- examples thereof include tri (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and tripropylene glycol di (meth) acrylate.
- a monofunctional monomer having one polymerizable group or a polyfunctional monomer having two or more polymerizable groups can be used. Two or more kinds of monomers may be mixed and used.
- Examples of the monofunctional monomer include N-vinyl monomers having a cyclic structure such as N-vinylpyrrolidone, N-vinylcaprolactam, (meth) acryloylmorpholine; isobornyl (meth) acrylate, tricyclodecanyl (meth) acrylate, benzyl (Meth) acrylates such as (meth) acrylate, dicyclopentanyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, nonylphenyl (meth) acrylate, phenoxyethyl (meth) acrylate, polypropylene glycol mono (meth) acrylate, etc. Compounds. Of these, N-vinyl monomers having a cyclic structure are preferred from the viewpoint of improving the curing rate.
- polyfunctional monomer examples include polyethylene glycol di (meth) acrylate, tricyclodecanediyldimethylene di (meth) acrylate, tripropylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, trimethylolpropane tri (meth) ) Acrylate, di (meth) acrylate of bisphenol compound ethylene oxide or propylene oxide adduct diol, epoxy (meth) acrylate obtained by adding di (meth) acrylate to glycidyl ether of bisphenol compound, and the like.
- the bisphenol compound examples include bisphenol A, bisphenol AP, bisphenol B, bisphenol BP, bisphenol C, bisphenol E, etc.
- bisphenol A is preferable. That is, a polyfunctional monomer having a bisphenol skeleton can be used as the polyfunctional monomer, and among them, a polyfunctional monomer having a bisphenol A skeleton is preferably used.
- the balance between the breaking strength and the Young's modulus of the primary resin layer is improved, and the coating residue is removed when the coating resin layer is removed from the glass fiber. It becomes difficult to remain.
- the photopolymerization initiator can be appropriately selected from known radical photopolymerization initiators, and examples thereof include acylphosphine oxide-based initiators and acetophenone-based initiators. Two or more photopolymerization initiators may be mixed and used.
- acylphosphine oxide initiator examples include 2,4,6-trimethylbenzoyldiphenylphosphine oxide (manufactured by BASF, trade name “Lucirin TPO”), 2,4,4-trimethylpentylphosphine oxide, 2,4,4 Examples include 4-trimethylbenzoyldiphenylphosphinoxide.
- acetophenone-based initiator examples include 1-hydroxycyclohexane-1-ylphenyl ketone (trade name “Irgacure 184” manufactured by BASF), 2-hydroxy-2-methyl-1-phenyl-propan-1-one ( BASF, trade name “Darocur 1173”), 2,2-dimethoxy-1,2-diphenylethane-1-one (BASF, trade name “Irgacure 651”), 2-methyl-1- (4- Methylthiophenyl) -2-morpholinopropan-1-one (BASF, trade name “Irgacure 907”), 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 (BASF) , Trade name “Irgacure 369”), 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy- - phenyl acetophenone, 1- (4-isopropylphenyl)
- a silane coupling agent may be added to the ultraviolet curable resin composition.
- the resin composition forming the primary resin layer contains a silane coupling agent, it is easy to adjust the adhesion between the glass fiber and the primary resin layer.
- the silane coupling agent represented by the following general formula (1) or (2) is mentioned, for example. Two or more silane coupling agents may be used in combination.
- R1 represents a group having reactivity upon irradiation with ultraviolet rays
- R2 to R8 each independently represents an alkyl group having 1 to 4 carbon atoms.
- Examples of the group that is reactive when irradiated with ultraviolet rays in R1 of the general formula (1) include groups having a functional group such as a mercapto group, a vinyl group, an allyl group, and a (meth) acryloyl group.
- R2 to R8 in the general formulas (1) and (2) may be the same or different and are not particularly limited as long as they are alkyl groups having 1 or more carbon atoms, but may have 4 or less carbon atoms. preferable.
- Specific examples of R2 to R8 include a methyl group, an ethyl group, a propyl group, and a butyl group.
- Examples of the silane coupling agent represented by the general formula (1) include 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropyltripropoxysilane, allyltrimethoxysilane, and allyltriethoxy. Examples include silane, allyltripropoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, 3- (meth) acryloxypropyltrimethoxysilane, and 3- (meth) acryloxypropyltriethoxysilane. Examples of the silane coupling agent represented by the general formula (2) include tetramethoxysilane, tetraethoxysilane, and tetrapropoxysilane.
- the content of the silane coupling agent is preferably 0.2 to 2% by mass based on the total amount of the resin composition for forming the primary resin layer.
- FIG. 2 is a cross-sectional view of the optical fiber ribbon 100 according to the present embodiment.
- the optical fiber ribbon 100 shown in the figure is obtained by integrating a plurality of (here, 4) optical fibers 1 arranged in parallel by a tape material 40.
- the optical fiber ribbon of this embodiment can take out the glass fiber by removing the tape material from the optical fiber ribbon.
- the tape material 40 is made of, for example, an epoxy acrylate resin, a urethane acrylate resin, or the like. From the viewpoint of easy removal of the tape material, the glass transition temperature of the tape material is preferably 60 ° C. or higher, and preferably 70 to 105 ° C.
- resin composition for forming secondary resin layer Content ratio of each component by mixing urethane acrylate obtained by reacting polypropylene glycol diol with diisocyanate and hydroxyethyl acrylate, bisphenol epoxy acrylate, isobornyl acrylate, N-vinylcaprolactam, and TPO Various secondary resin layer forming resin compositions were prepared.
- [Preparation of resin composition for tape material] 18 parts by mass of urethane acrylate obtained by reacting 1 mol of bisphenol A / ethylene oxide addition diol, 2 mol of tolylene diisocyanate and 2 mol of hydroxyethyl acrylate, reacting 1 mol of polytetramethylene glycol, 2 mol of tolylene diisocyanate and 2 mol of hydroxyethyl acrylate 10 parts by mass of urethane acrylate obtained, 15 parts by mass of tricyclodecane diacrylate obtained by reacting 1 mol of tolylene diisocyanate and 2 mol of hydroxyethyl acrylate, 10 parts by mass of N-vinylpyrrolidone, and 10 parts by mass of isobornyl acrylate Parts, 5 parts by mass of bisphenol A / ethylene oxide-added diol diacrylate, 2-methyl-1- [4- (methylthio) Nyl] -2-morpholino-propan-1-one
- Optical fiber core (Examples 1 to 4, Comparative Examples 1 to 6)
- a primary resin layer is formed to have an outer diameter of 190 ⁇ m on the outer periphery of a glass fiber having a diameter of 125 ⁇ m composed of a core and a clad
- a secondary resin layer is formed to have an outer diameter of 250 ⁇ m on the outer periphery.
- Example 5 The primary resin layer used in Example 1 is formed to have an outer diameter of 160 ⁇ m on the outer periphery of a 125 ⁇ m diameter glass fiber composed of a core and a clad, and the secondary resin layer used in Example 1 is formed on the outer periphery.
- An optical fiber core having an outer diameter of 200 ⁇ m was produced by forming a diameter of 195 ⁇ m and further forming a colored layer (ink layer) on the outer periphery of the secondary resin layer.
- Example 6 The primary resin layer used in Example 1 is formed to have an outer diameter of 190 ⁇ m on the outer periphery of a glass fiber having a diameter of 125 ⁇ m composed of a core and a clad, and a colored secondary resin layer is formed to have an outer diameter of 260 ⁇ m on the outer periphery.
- an optical fiber core having an outer diameter of 260 ⁇ m was produced.
- Example 7 The primary resin layer used in Example 1 is formed to have an outer diameter of 170 ⁇ m on the outer periphery of a 125 ⁇ m diameter glass fiber composed of a core and a cladding, and a colored secondary resin layer is formed to have an outer diameter of 200 ⁇ m on the outer periphery.
- an optical fiber core having an outer diameter of 200 ⁇ m was produced.
- optical fiber ribbon Four optical fiber cores were juxtaposed, and the periphery thereof was coated and integrated with a resin composition for a tape material to obtain an optical fiber tape core.
- FIG. 3 is a graph plotting the relationship between the adhesion between the glass fiber and the coating resin layer and the storage elastic modulus of the coating resin layer in the optical fiber core wires produced in Examples and Comparative Examples.
- SYMBOLS 1 Optical fiber core wire, 10 ... Glass fiber, 12 ... Core, 14 ... Cladding, 20 ... Coating resin layer, 22 ... Primary resin layer, 24 ... Secondary resin layer, 40 ... Tape material, 100 ... Optical fiber tape core wire .
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Abstract
Description
本出願は、2016年1月12日出願の日本出願第2016-003716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。
y>222.1e4.7799x (I)
光ファイバ心線の耐側圧特性を向上するために、ガラスファイバと接する側にはヤング率の低い被覆樹脂層を形成することが求められている。しかしながら、被覆樹脂層のヤング率が低くなるほど破断強度も低下するため、テープ一括除去時にガラスファイバ側に被覆カスが残りやすくなる。
本開示によれば、テープ一括除去性に優れる光ファイバ心線及び光ファイバテープ心線を提供することができる。
最初に、本発明の実施形態の内容を列記して説明する。本発明の一実施形態による光ファイバ心線は、ガラスファイバと、ガラスファイバを覆う被覆樹脂層と、を備え、ガラスファイバと被覆樹脂層との間の100℃における密着力をxとし、被覆樹脂層の85℃、周波数11Hzにおける貯蔵弾性率をyとしたときに、xが0.2~0.6kgfであり、yが600~6000MPaであり、かつ、下記式(I)で表される関係を満たす。
y>222.1e4.7799x (I)
本発明の実施形態に係る光ファイバ及びその製造方法の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許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。
図1は、本実施形態に係る光ファイバ心線1の一例を示す断面図である。図1に示されるように、本実施形態の光ファイバ心線1は、光伝送体であるガラスファイバ10及び被覆樹脂層20を備えている。
y>222.1e4.7799x (I)
本実施形態の光ファイバ心線を用いて光ファイバテープ心線を作製することができる。図2は、本実施形態に係る光ファイバテープ心線100の断面図である。同図に示される光ファイバテープ心線100は、並列配置された複数本(ここでは4本)の光ファイバ心線1がテープ材40により一体化されたものである。本実施形態の光ファイバテープ心線は、光ファイバテープ心線からテープ材を一括除去してガラスファイバを取り出すことができる。
ポリプロピレングリコールジオールに、ジイソシアネート及びヒドロキシエチルアクリレートを反応させることにより得られるウレタンアクリレートと、ノニルフェニルアクリレートと、N-ビニルカプロラクタムと、トリプロピレングリコールジアクリレートと、2,4,6-トリメチルベンゾイルジフェニルホスフィンオキサイド(BASF社製、商品名「ルシリンTPO」)と、シランカップリング剤であるメルカプトプロピルトリメトキシシランとを混合して、各成分の含有割合を変更したプライマリ樹脂層形成用樹脂組成物を各種調製した。
ポリプロピレングリコールジオールに、ジイソシアネート及びヒドロキシエチルアクリレートを反応させることにより得られるウレタンアクリレートと、ビスフェノール系エポキシアクリレートと、アクリル酸イソボルニルと、N-ビニルカプロラクタムと、TPOとを混合して、各成分の含有割合を変更したセカンダリ樹脂層形成用樹脂組成物を各種調製した。
ウレタンアクリレート系樹脂を70質量部、有機顔料を6質量部、2官能アクリレートモノマーと多官能アクリレートモノマーとの混合物(配合比:4/6)を20質量部、イルガキュア907を3質量部、フェノール系酸化防止剤を0.03質量部、硫黄系酸化防止剤を0.01質量部、アミン系重合禁止剤を0.01質量部及びシリコーンオイルを0.1質量部混合して、着色層(インク層)形成用樹脂組成物を調製した。
実施例1で用いたセカンダリ樹脂層形成用樹脂組成物100質量部に対して、有機顔料を5質量部混合して、着色セカンダリ樹脂層形成用樹脂組成物を調製した。
ビスフェノールA・エチレンオキサイド付加ジオール1mol、トリレンジイソシアネート2mol及びヒドロキシエチルアクリレート2molを反応させて得られるウレタンアクリレートを18質量部、ポリテトラメチレングリコール1mol、トリレンジイソシアネート2mol及びヒドロキシエチルアクリレート2molを反応させて得られるウレタンアクリレートを10質量部、トリレンジイソシアネート1mol及びヒドロキシエチルアクリレート2molを反応させて得られるトリシクロデカンジアクリレートを15質量部、N-ビニルピロリドンを10質量部、イソボルニルアクリレートを10質量部、ビスフェノールA・エチレンオキサイド付加ジオールジアクリレートを5質量部、2-メチル-1-[4-(メチルチオ)フェニル]-2-モルホリノ-プロパン-1-オン(BASF社製、商品名「イルガキュア907」)を0.7質量部及びTPOを1.3質量部混合して、テープ材用樹脂組成物を調製した。
(実施例1~4,比較例1~6)
コア及びクラッドから構成される直径125μmのガラスファイバの外周に、プライマリ樹脂層を外径190μmとなるように形成し、その外周にセカンダリ樹脂層を外径250μmとなるように形成し、更にセカンダリ樹脂層の外周に着色層(インク層)を形成することで、外径260μmの光ファイバ心線をそれぞれ作製した。
コア及びクラッドから構成される直径125μmのガラスファイバの外周に、実施例1で用いたプライマリ樹脂層を外径160μmとなるように形成し、その外周に実施例1で用いたセカンダリ樹脂層を外径195μmとなるように形成し、更にセカンダリ樹脂層の外周に着色層(インク層)を形成することで、外径200μmの光ファイバ心線を作製した。
コア及びクラッドから構成される直径125μmのガラスファイバの外周に、実施例1で用いたプライマリ樹脂層を外径190μmとなるように形成し、その外周に着色セカンダリ樹脂層を外径260μmとなるように形成することで、外径260μmの光ファイバ心線を作製した。
コア及びクラッドから構成される直径125μmのガラスファイバの外周に、実施例1で用いたプライマリ樹脂層を外径170μmとなるように形成し、その外周に着色セカンダリ樹脂層を外径200μmとなるように形成することで、外径200μmの光ファイバ心線を作製した。
光ファイバ心線を4本並列してそれらの周囲をテープ材用樹脂組成物で被覆して一体化して光ファイバテープ心線を得た。
(貯蔵弾性率)
まず、光ファイバ心線をMEKに浸漬させることで被覆樹脂層をガラスファイバから剥離した。次いで、剥離した被覆樹脂層を25℃、50%RHの環境で12時間以上保管した後に、レオメーター(ソリッドSアナライザー RSA-IIを用い、周波数11Hz、温度85℃における貯蔵弾性率を測定した。結果を表1に示す。
まず、光ファイバ心線の被覆樹脂層に、カミソリで刃先がガラスファイバ表面に届かない深さで切れ目を入れて、切れ目を挟んだ一方の被覆樹脂層を台紙に張り付けて台紙を固定し、85℃の恒温槽に入れた。次いで、他方の光ファイバ心線を把持して、速度5mm/分で引張り、ガラスファイバが台紙に固定された被覆樹脂層から引き抜かれるときの引抜力(最大値)を測定し、これを密着力とした。結果を表1に示す。
住友電気工業株式会社製の商品名「JR-6」を用いて、光ファイバテープ心線からのテープ一括除去性を評価した。テープ一括除去は、85℃の加熱部に光ファイバテープ心線を挟みこみ、5秒間保持した後に行った。被覆樹脂層の形態が保持され、ガラスファイバ上に被覆カスが残らない状況を除去性が「良好」とし、それ以外を「不良」とした。結果を表1及び表2に示す。
Claims (9)
- コア及び該コアを覆うクラッドを有するガラスファイバと、前記ガラスファイバを覆う被覆樹脂層と、を備える光ファイバ心線であって、
前記ガラスファイバと前記被覆樹脂層との間の85℃における密着力をxとし、前記被覆樹脂層の85℃、周波数11Hzにおける貯蔵弾性率をyとしたときに、前記xが0.2~0.6kgfであり、前記yが600~6000MPaであり、かつ、下記式(I)で表される関係を満たす、光ファイバ心線。
y>222.1e4.7799x (I) - 外径が190~260μmである、請求項1に記載の光ファイバ心線。
- 外径が190~210μmである、請求項1に記載の光ファイバ心線。
- 外径が260μm以下であり、
前記被覆樹脂層が、複数の層から構成され、前記被覆樹脂層の最外層が着色層である、請求項1に記載の光ファイバ心線。 - 外径が210μm以下であり、
前記被覆樹脂層が、複数の層から構成され、前記被覆樹脂層の最外層が着色層である、請求項1に記載の光ファイバ心線。 - 前記被覆樹脂層が、プライマリ樹脂層とセカンダリ樹脂層とを有し、
前記プライマリ樹脂層が、多官能モノマーを含有する紫外線硬化型樹脂組成物の硬化物を含む、請求項1~5のいずれか一項に記載の光ファイバ心線。 - 前記紫外線硬化型樹脂組成物がシランカップリング剤を更に含有する、請求項6に記載の光ファイバ心線。
- 請求項1~7のいずれか一項に記載の光ファイバ心線を複数並列してテープ材で覆われている、光ファイバテープ心線。
- 前記テープ材のガラス転移温度が60℃以上である、請求項8に記載の光ファイバテープ心線。
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