JPH09258074A - Ribbon-structured coated optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ribbon-structured coated optical fiber formed by using a curable band ring material having the characteristic that the surface of the cured matter is smooth and has a small coefft. of friction. SOLUTION: The ribbon-structured coated optical fiber is formed by lining up plural pieces of optical fibers subjected to primary and secondary coating by a resin to a plane form and solidifying these fibers with the cured matter of the band ring material to form the fibers to a ribbon form of a rectangular shape in section. The following components (a), (b) and (c) are incorporated into the band ring material. The band ring material contains (a) polyether polyurethane which is one or >=2 kinds of polyether polyurethane having ethylenic unsatd. groups and contain 40 to 85wt.% tetramethyleneoxy structures in the entire structure thereof, (b) an ethylenic unsatd. monomer and (c) a polymn. initiator. The dynamic coefft. of friction of the cured matter and polyethylene is specified to <=0.4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape-structured optical fiber core wire in which optical fiber wires are bundled in a plane with a cured product of a bundling material.

[0002]

2. Description of the Related Art Conventionally, a tape-structured optical fiber (tape-structured optical fiber) in which a plurality of optical fiber wires coated with a primary and a secondary coating with a resin are arranged on a plane and fixed with a resin to form a tape having a rectangular cross section )It has been known. A material (tape material) for bundling the optical fiber strands to form a tape-like structure is called a bundling material. As the bundling material, nylon or the like which is a thermoplastic resin has been conventionally used, but in recent years, a curable resin by radiation such as ultraviolet rays has been studied for the purpose of improving production.

[0003]

When the characteristics required of the curable resin used as the bundling material are examined, the following can be mentioned. Curing rate is fast and productivity is good. Cured product has sufficient strength and flexibility. Cured product has little change in physical properties over a wide temperature range. The cured product has excellent resistance to chemicals such as acids and alkalis. The cured product has low hygroscopicity and water absorption. The surface of the cured product is smooth and the friction coefficient is small.

Of the above, particularly, it is necessary as a curable bundling material for optical fibers. That is, a slot-structured optical fiber cable in which a tape-structured core wire is inserted into a polyethylene slot is well known. However, a small dynamic friction coefficient between the polyethylene, which is a slot material, and the tape-structured core wire reduces transmission loss of the optical fiber. . Further, since the tape-structured core wire is exposed to a high temperature when manufacturing the slot-structured optical fiber cable, the coefficient of dynamic friction must be small as described above even after high temperature aging.
Also, if the coefficient of friction between the tape structure core wires, that is, between the cured products of the bundling material is large,
Since the transmission loss increases, it is necessary for the tape structure to have a small friction coefficient.

However, in the conventional bundling material,
There is no one that sufficiently satisfies all the required characteristics, and it is a point newly found by the present inventors that the above characteristics are important as a bundling material, and the present invention has all the required characteristics described above. It is an object of the present invention to provide a tape structure optical fiber core wire using a curable bundling material for optical fiber which satisfies the above requirements.

[0006]

In view of such circumstances, the present inventor has conducted various studies to solve the above-mentioned problems, and as a result, blended a polyether polyurethane having a specific structure, an ethylenically unsaturated monomer and a polymerization initiator. It was found that when the coefficient of kinetic friction between the cured product and polyethylene is 0.4 or less, it becomes an excellent bundling material that satisfies the above-mentioned required characteristics, and the present invention was completed by using this. .

That is, according to the present invention, a plurality of optical fiber wires coated with primary and secondary coatings of resin are arranged in a plane, and hardened with a cured bundling material to form a tape having a rectangular cross section. A structural optical fiber, wherein the bundling material comprises the following components (a), (b) and (c): (a) one or more polyether polyurethanes having an ethylenically unsaturated group, A polyether polyurethane containing 40 to 85% by weight of tetramethyleneoxy structure in the entire structure, (b) an ethylene positive unsaturated monomer, and (c) a polymerization initiator, and a dynamic friction between the cured product and polyethylene. The present invention provides a tape structure optical fiber core wire having a coefficient of 0.4 or less.

The component (a) used in the present invention is one or more polyether polyurethanes having an ethylenically unsaturated group. Examples of the ethylenically unsaturated group include vinyl group, (meth) acryloyl group,
Examples thereof include a (meth) acrylamide group, a vinyl urethane group, a vinyl ether group, and a vinyl sulfide group, and a (meth) acryloyl group and a (meth) acrylamide group are particularly preferable.

In these polyether polyurethanes, a tetramethyleneoxy structure is contained in a total structure of 40 to 85.
% (Hereinafter, simply abbreviated as%). When the tetramethyleneoxy structure is less than 40%, the Young's modulus of the cured product at low temperature increases, which is not preferable. On the other hand, when it exceeds 85%, there arise problems that the viscosity of the composition becomes too high, the composition precipitates crystals at room temperature, and phase separation occurs. The tetramethyleneoxy structure may be contained in one kind of polyether polyurethane in a predetermined ratio, or may be contained in a mixture of two or more kinds of polyether urethane in a predetermined ratio. Therefore, the polyether polyurethane as the component (a) contains at least one polyether polyurethane having a tetramethyleneoxy structure.

Ether-based diols (hereinafter referred to as "specific ether-based diols") constituting the polyether polyurethane having such a tetramethyleneoxy structure.
Examples thereof include polytetramethylene glycol, a copolymer diol of tetrahydrofuran and a cyclic ether other than tetrahydrofuran, and the like. In the present invention, as long as the tetramethyleneoxy structure in the polyether polyurethane is a predetermined amount, ether-based diols and polyether-based diamines other than the above can be used in combination, such as ethylene glycol, propylene glycol, butanediol, 1,6-hexanediol, polyethylene glycol, polypropylene glycol, an alkylene oxide adduct of bisphenol A,
Examples thereof include alkylene oxide adducts of bisphenol F, ethylene oxide-propylene oxide copolymerized diols, and the like. Among them, ethylene glycol, polypropylene glycol, alkylene oxide adducts of bisphenol A, polyoxypropylene diamine, and "Diefarmin D-230". "Same D-400""SameD-2"
It is preferable to use a commercially available polyether diamine such as "000" (manufactured by JFerson Chemical Co.). Examples of cyclic ethers other than tetrahydrofuran used above include propylene oxide, ethylene oxide, butylene oxide, methyltetrahydrofuran, oxetane, substituted oxetane, oxepane, etc. Among them, propylene oxide and / or methyltetrahydrofuran are preferably used. These specific ether diols may be used in combination, and examples thereof include a mixture of polytetramethylene glycol and a tetrahydrofuran-propylene oxide copolymer diol. In the present invention, the number average molecular weight of the polyether polyurethane as the component (a) is usually 1000 to 10.
000, preferably 3000 to 8000.

The monofunctional vinyl monomer of the component (b) used in the present invention includes 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, butoxyethyl (meth) acrylate and ethyldiethylene glycol (meth). ) Acrylate, 2-
Ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, polyethylene glycol (meth) acrylate, polypropylene glycol (meth)
Acrylate, methyltriethylenediglycol (meth) acrylate, irobornyl (meth) acrylate, N-vinylpyrrolidone, N-vinylcaprolactam, diacetone (meth) acrylamide, isobutoxymethyl (meth) acrylamide, N, N-dimethyl (meth) Acrylamide, t-octyl (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, (meth) acryloylmorpholine, dicyclopentenyl (meth) acrylate, dicyclopentenyl 8meth) acrylate, tricyclodeca Examples thereof include nyl (meth) acrylate and compounds represented by the following formulas (I) to (III).

[0012]

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[In the formula, R ¹ is a hydrogen atom or a methyl group, R ² is an alkylene group having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms, and R ³ is a hydrogen atom or 1 carbon atoms.
~ 12, preferably 1-9 alkyl groups, m is 0
-12, preferably 1-8. ]

[0014]

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[Wherein R ¹ is as described above, R ⁴ is an alkylene group having 2 to 8 carbon atoms, preferably 2 to 5 carbon atoms, and p is 1 to 8, preferably 1 to 4] . ]

[0016]

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[In the formula, R ¹ , R ⁴ and p are as defined above, and R ⁵ is a hydrogen atom or a methyl group. ]

Among the components (b) used in the present invention, the polyfunctional vinyl monomer is trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ethylene glycol di (meth) acrylate.
Acrylate, tetraethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) Acrylate,
Trimethylolpropane trioxyethyl (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, dicyclopentadiene di (meth) acrylate, dicyclopentane di (meth) acrylate. Tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate di (meth) acrylate, epoxy (meth) acrylate obtained by adding (meth) acrylate to diglycidyl ether of bisphenol A. Etc.

Further, vinyl ethers, vinyl sulfides, vinyl urethanes, vinyl ureas and the like can be used as the component (b) in the present invention. Of the various ethylenically unsaturated monomers, compounds represented by the structural formulas (I) to (III), vinylpyrrolidone, vinylcaprolactam and the like are preferable from the viewpoint of further improving the curability. In the present invention, by containing an ethylenically unsaturated monomer having an alicyclic structure,
The water resistance, hot water resistance, acid resistance, and alkali resistance of the cured product are further improved, and long-term reliability is further improved. Preferred examples of the ethylenically unsaturated monomer having the alicyclic structure include irobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, tricyclodecanyl (meth) acrylate and cyclohexyl (meth).
Acrylate, tricyclodecane dimethanol di (meth) acrylate and the like can be mentioned, and among them, isobornyl acrylate and tricyclodecane dimethanol diacrylate are particularly preferable.

The polymerization initiator of the component (c) used in the present invention is not particularly limited, and for example, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2.
-Phenylacetophenone, acetophenone, benzophenone, xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4,4'-diaminobenzophenone, Michler's ketone, benzoin propyl ether, benzoin ethyl ether, benzyl dimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropane-1. -One, thioxanthone compound,
2-methyl-1- [4- (methylthio) phenyl] -2
-Morpholino-propan-1-one, 2,4,6-trimethylbenzoyldiphenylphosphine oxide and the like can be mentioned, particularly preferably 1-hydroxycyclohexyl phenyl ketone, benzyl dimethyl ketanol, 2-
Methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 2,4,6-trimethylbenzoyldiphenylphosphine oxide and the like can be mentioned.

These photopolymerization initiators may be used either individually or in combination of two or more. If necessary, a sensitizer (photopolymerization accelerator) such as an amine compound may be used as long as it does not hinder the curing of the present invention. Can be used together. Further, a thermal polymerization initiator other than the photopolymerization initiator can be used.

The polyether polyurethane having a tetramethyleneoxy structure (hereinafter referred to as "polymer (a)") contained in the polyether polyurethane which is the component (a) of the present invention is prepared by the following method. It can be manufactured.

Production Method-1 A method of reacting an ethylenically unsaturated group-containing compound with a functional group of an intermediate product obtained by reacting a specific ether diol and diisocyanate. Production method-2 A method in which a functional group of an intermediate product obtained by reacting a diisocyanate and an ethylenically unsaturated group-containing compound is reacted with a specific ether diol. Production method-3 A method of simultaneously reacting a diisocyanate, a specific ether diol and an ethylenically unsaturated group-containing compound. Production method-4 A method of reacting a specific ether diol, an isocyanate group, and an ethylenically unsaturated group-containing compound.

Examples of the ethylenically unsaturated group-containing compound used in the above-mentioned production method include a vinyl type, (meth) acrylic type (having a hydroxyl group, amino group, isocyanate group, carboxyl group, acid halide group, epoxy group, etc., ( Examples thereof include (meth) acrylamide-based, vinyl ether-based, and vinyl sulfide-based compounds containing an ethylenically unsaturated group.

Examples of the ethylenically unsaturated group-containing compound having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxyoctyl (meth) acrylate, pentaerythritol tri (meth). ) Acrylate, glycerin di (meth) acrylate, dipentaerythritol monohydroxy peta (meth) acrylate,
1,4-Putanediol mono (meth) acrylate, 4
-Hydroxycyclohexyl (meth) acrylate,
1,6-hexanediol mono (meth) acrylate,
Trimethylolpropane di (meth) acrylate, trimethylolethane di (meth) acrylate; obtained by addition reaction of glycidyl group-inducing compounds such as alkyl burycidyl ether, aryl glycidyl ether, glycidyl (meth) acrylate and (meth) acrylic acid Compound; a (meth) acrylate represented by the following structural formula

[0026]

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(In the formula, R ⁶ is a hydrogen atom or a methyl group, and n is 1 to 5); N-methylyl (meth) acrylamide, 2-hydroxyethyl vinyl ether,
2-hydroxyethyl vinyl sulfide and the like can be mentioned. Examples of the ethylenically unsaturated group-containing compound having an amino group include aminoethyl (meth) acrylate, N
-Methylaminoethyl (meth) acrylate, (meth)
Examples include acrylamide and N-tert-octyl acrylamide.

Examples of the ethylenically unsaturated group-containing compound having an isocyanate group include vinyl isocyanate, isopropenyl isocyanate, allyl isocyanate, and the like. Examples of the ethylenically unsaturated group-containing compound having a carboxyl group include (meth) acrylic acid. Examples of the ethylenically unsaturated group-containing compound having an acid halide group include (meth) acrylic acid halides such as (meth) acrylic acid chloride and (meth) acrylic acid bromide, and ethylenic compounds having an epoxy group. Examples of the unsaturated group-containing compound include glycidyl (meth) acrylate, allyl glycidyl ether, N-vinyl glycidyl urethane, N-isopropenyl glycidyl urethane, vinyl glycidyl ether, and vinyl glycidyl sulfide.

Examples of the diisocyanate used in the above-mentioned production method include 2,4-toluene diisocyanate and 2,2-toluene diisocyanate.
6-toluene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylene diisocyanate, 1,
5-naphthalene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 3,
3'-dimethyl-4,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 3,3'-dimethylphenylene diisocyanate,
4,4'-biphenylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate and the like can be mentioned. Among these diisocyanates, preferably,
2,4-toluene diisocyanate, 2,6-toluene diisocyanate, hydrogenated diphenylmethane diisocyanate, isophorone diisocyanate and the like. These diisocyanates may be used alone or in combination of two or more.

Next, a preferred embodiment of the above production method 1 will be described. The amount of diisocyanate used is about 0.5 to 2 moles per equivalent of hydroxyl group of the specific ether meter diol. In this reaction, a catalyst such as copper naphthenate, cobalt naphthenate, zinc naphthenate, n-butyltin laurate, and triethylamine is usually added in a total amount of 100 parts of the reaction product.
The reaction is carried out using 0.01 to 1.0 part by weight per part by weight. The reaction temperature in this reaction is usually 0 to 80 ° C. The compound having an ethylenically unsaturated group is reacted with the functional group of the intermediate product thus obtained. The amount of the compound having an ethylenically unsaturated group used is 1 equivalent of the functional group of the intermediate product. To about 1 mol, and the reaction conditions are the same as the reaction conditions for forming the above-mentioned intermediate product.

Next, a preferred embodiment of the above production method 2 will be shown. About 1 mol of a compound having an ethylenically unsaturated group is reacted with 1 mol of diisocyanate under the same reaction conditions as in production method 1, and the hydroxyl group of the specific ether diol is added to 1 equivalent of the functional group of the intermediate product. It is used in an amount of about 1 equivalent, and the reaction is performed under the same reaction conditions as in production method 1.

Next, a preferred embodiment of the above production method 3 will be described. 0.5 to 2 mol of diisocyanate and 0.5 to 2 mol of a compound having an ethylenically unsaturated group are reacted with 1 mol of a specific ether diol under the same reaction conditions as in the production method 1.

In carrying out the above Production Methods 1 to 3, a polyol other than a difunctional group can be used for the diol, and a polyisocyanate other than the difunctional can be used for the diisocyanate in an amount such that the product does not gel. The combined amount thereof is 5 parts by weight to 0 parts by weight with respect to 100 parts by weight of the diol or diisocyanate. Examples of the non-bifunctional polyols include, for example, addition products of glycerin and propylene oxide, glycerin, 1,2,3-pentanetriol, 1,2,3-butanetriol, and tri (2-hydroxypolyoxypropyl) polyol. Examples thereof include siloxane, polycaprolactone triol, polycaprolactone tetraol, liquid polybutadiene having more than two hydroxyl groups in one molecule, or a hydrogenated product of this compound. Examples of polyisocyanates other than difunctional include polymethylene polyphenyl isocyanate and triphenylmethane 4,4 ′, 4 ″ -triisocyanate.

Next, a preferred embodiment of the above production method 4 will be shown. 2 mol of a compound having an isocyanate group and an ethylenically unsaturated group is reacted with 1 mol of a specific ether diol under the same reaction conditions as in the production method 1. In these production methods 1 to 4, a diol other than the specific ether diol or a polyether diol can be used in combination with the specific ether diol.

In the present invention, (a), (b), (c)
The blending ratio of the components is usually 20 to 85%, preferably 40 to 80% of the polyether polyurethane of the component (a),
Component (b) ethylenically unsaturated monomer 5 to 70%, preferably 15 to 60%, component (c) polymerization initiator 0.1
It is -10%, preferably 1-5%. Incidentally, various additives to the bundling material of the present invention, for example, an antiaging agent, a storage stabilizer, an ultraviolet absorber, a surfactant, a leveling agent,
A colorant, an amine, and a silane coupling agent can be mixed, and the amount of each used is usually 10% by weight or less.

The viscosity of the bundling material of the present invention thus prepared is usually 1000 to 20000 cps /
25 ° C, preferably 2000-10000 cps / 25
° C. The bundling material of the present invention has a dynamic friction coefficient between the cured product and polyethylene (measured according to ASTM-D 1894) of 0.4 or less, preferably 0.35 or less, and particularly preferably 0.3 or less. If the dynamic friction coefficient between the cured product of the bundling material and polyethylene exceeds 2.5, there is a problem that the transmission loss of the optical fiber cable increases. Further, the static friction coefficient between the cured product of the bundling material of the present invention and polyethylene is usually 1.1 or less, preferably 1.0 or less, and the static friction coefficient between the cured products of the bundling material is usually 3 or less. The coefficient of static friction of the cured product of the bundling material after heating with time is usually 4.0 or less, preferably 3.5 or less, and preferably 2.5 or less.

[0037]

EXAMPLES The present invention will now be described in detail with reference to the working order, but the present invention is not limited thereto. Production Example-1 2,4-Tolylene diisocyanate 674 was placed in a reaction vessel.
g, dibutyltin dilaurate 5 g and 2,6-dit-
1 g of butyl-4-methylphenol was charged. In addition to this, polytetramethylene glycol with a number average molecular weight of 2000 (Mitsubishi Chemical Industries, Ltd., PTMG 2000) 3876
g was added over 3 hours while controlling the internal temperature to 60 to 70 ° C. After the addition of polytetramethylene glycol was completed, 450 g of 2-hydroxyethyl acrylate was added over 1 hour while maintaining the temperature at 60 to 70 ° C, and the reaction was terminated after maintaining the internal temperature at 60 to 70 ° C for 3 hours. . The obtained polyether polyurethane is designated as PU-1.

Production Example-2 Instead of polytetramethylene glycol, the number average molecular weight is 2
Polycaprolactone polyurethane was produced in the same manner as in Production Example-1 except that 000 polycaprolactone (Placcel 212AL manufactured by Daicel) was used. The obtained polycaprolactone polyurethane is designated as PU-2.

Production Example-3 A number average molecular weight of 2 was used instead of polytetramethylene glycol.
000 polypropylene glycol (Asahi Ohrin, E
A polyether polyurethane was produced in the same manner as in Production Example-1 except that XENOL2020) was used. The obtained polyether polyurethane is designated as PU-3.

Production Example-4 Instead of polytetramethylene glycol, the number average molecular weight was 2
Propylene oxide and tetrahydrofuran in a weight ratio of 3 bags of a ring-opening copolymerized diol (manufactured by Hodogaya Chemical Co., Ltd., PP
A polyether polyurethane was produced in the same manner as in Production Example 1 except that TG2000) was used. The obtained polyether polyurethane is designated as PU-4.

Production Example-5 In a reaction vessel, tricyclodecane dimethanol diacrylate (778 g), vinylpyrrolidone (389 g), 2,4-tolylene diisocyanate (720 g), dibutyltin dilaurate (4 g) and 2,6-dit-butyl-4-methyl were prepared. 1 g of phenol was charged. While cooling the container with ice water, add 320 g of hydroxyethyl acrylate to the inside temperature of 2
The internal solution was added while stirring so that the temperature did not exceed 0 ° C. After the addition was completed, the internal temperature was maintained at 5 to 20 ° C., and stirring was continued for 1 hour, then 85 g of ethylene glycol and then polytetramethylene glycol having a number average molecular weight of 2000 (PTMG2000, manufactured by Mitsubishi Kasei Co., Ltd.) 2759.
g was added so that the internal temperature did not exceed 60 ° C. After the completion of the addition, the internal temperature is maintained at 50 to 60 ° C., the stirring is continued for 3 hours, and then the reaction is terminated.
Tricyclodecane dimethanol acrylate: vinylpyrrolidone = 10: 2: 1 polyether polyurethane /
An ethylenically unsaturated monomer mixture was obtained. The polyether polyurethane component in the obtained mixture is designated as PU-5.

Production Example-6 Instead of polytetramethylene glycol having a number average molecular weight of 2000, polytetramethylene glycol having a number average molecular weight of 1000 (PTMG1000 manufactured by Mitsubishi Kasei Co., Ltd.)
2139 g, and the amounts of 2,4-tolylene diisocyanate, hydroxyethyl acrylate and ethylene glycol used were 1116 g, 496 g and 13 respectively.
A polyether polyurethane / tricyclodecane dimethanol acrylate: vinylpyrrolidone = 10: 2: 1 polyether polyurethane / ethylenically unsaturated monomer mixture was obtained in the same manner as in Production Example 5 except that the amount was changed to 3 g. The polyether polyurethane component in the obtained mixture is designated as PU-6.

Production Example-7 2,4-Tolylene diisocyanate 177 was placed in a reaction vessel.
6 g, dibutyltin dilaurate 5 g, 2,6-di-t-butylmethylphenol 1.5 g and tricyclodecane dimethanol diacrylate 1250 g were charged. To this, 2041 g of a bisphenol A ethylene oxide adduct having a number average molecular weight of 400 (DA400 manufactured by NOF CORPORATION) was added over 2 hours while controlling the internal temperature to 60 to 70 ° C. After addition of the bisphenol A ethylene oxide adduct, stirring was continued at 60-70 ° C for about an additional hour. After that, while maintaining the internal temperature at 60 to 70 ° C., 2-
1184 g of hydroxyethyl acrylate was added over 1 hour, and then the internal temperature was maintained at 60 to 70 ° C. for 3 hours, then the reaction was terminated, and polyether polyurethane:
A polyether polyurethane / ethylenically unsaturated monomer mixture with tricyclodecane dimethanol acrylate = 4: 1 was obtained. The polyether polyurethane component in the obtained mixture is designated as PU-7.

Production Example-8 1155 g of isobornyl acrylate in a reaction vessel, 2,
1648 g of 4-tolylene diisocyanate, 4 g of dibutyltin dilaurate and 1 g of 2,6-di-t-butyl-4-methylphenol were charged. To this, 2197 g of hydroxyethyl acrylate was added while stirring the internal solution so that the internal temperature did not exceed 50 ° C. After completion of the addition, stirring was continued for 3 hours while maintaining the internal temperature at 60 to 70 ° C., and then the reaction was terminated. The obtained product was obtained by adding 2 mol of hydroxyethyl acrylate to 1 mol of tolylene diisocyanate.
It was confirmed by gel permeation chromatography and mass spectrum analysis that it was a mixture of vinyl urethane and isobornyl acrylate that had been reacted in a molar ratio of 10: 3 by weight. The vinyl urethane in the obtained mixture is designated as UM-1.

Examples 1 to 6 A bundling material having the composition shown in Table 1 was prepared, and its specification was evaluated according to the following test method. The mixture of polyether polyurethane, polycaprolactone polyurethane, ethylenically unsaturated monomer, and photopolymerization initiator is mixed at a temperature of 50 to 6
It was carried out at 0 ° C. for 2 hours to obtain a uniform liquid material.

<Test Method> Using the liquid material obtained as described above, a test piece was prepared as follows, and the following test was conducted. (1) Preparation of test piece A liquid material was applied onto a glass plate with an applicator having a thickness of 250 μm to give 0.5 J / cm ² (wavelength: 350 n
The cured film was obtained by irradiating the ultraviolet rays of m). Then, the cured film was peeled off from the glass plate and conditioned at 23 ° C. and 50% relative humidity for 24 hours to prepare a test piece. (2) Measurement of Young's modulus and elongation at break Using a tensile tester with constant temperature bath, -40 ° C, 23 ° C and 60
The Young's modulus of the test piece at 0 ° C.
min, the distance between marked lines was 25 mm, and the elongation at break was measured at a tensile speed of 50 mm / min and the distance between marked lines was 25 mm. (3) Evaluation of heat resistance and hot water resistance The test piece was placed in a constant temperature bath at 80 ° C and warm water at 80 ° C for 3 days.
After storing for a month, Young's modulus and elongation at break at 23 ° C. were measured by the method (2). The Young's modulus and the rate of change in breaking elongation with respect to the initial values were within ± 30%, and those exceeding ± 30% were regarded as unacceptable. (4) Evaluation of surface state by measuring friction coefficient After coating the composition on a glass plate using an applicator having a thickness of 250 μm, 0.5 J / cm ² (wavelength: 350 n
The coating film was cured by irradiating the ultraviolet rays of m). The static friction coefficient between the cured film and polyethylene (Hi-Zex 6300 "M, manufactured by Mitsui Petrochemical Co., Ltd.) was determined by ASTM-D 18
94. Also, a cured film of 100
It heat-processed at 24 degreeC for 24 hours, and measured the static friction coefficient after a process similarly. Table 1 shows the measurement results. <Test Results> The results are shown in Table 1. The abbreviations in Table 1 are as follows. SA-1002: tricyclodecane dimethanol diacrylate EA-1370: epoxy acrylate having the following structure

[0047]

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IRG184: 1-hydroxycyclohexyl phenyl ketone

[0049]

[Table 1]

[0050]

The curable bundling material for optical fibers used for the tape-structured optical fiber of the present invention has a high curing rate and good productivity. The cured product has sufficient strength and flexibility. The cured product has a wide temperature range. There is little change in physical properties in cured products, and there is little change in physical properties over time, and the long-term reliability is excellent. The cured product has excellent chemical resistance to acids, alkalis, etc.Low hygroscopicity and water absorption of the cured product The surface of the cured product is smooth, It has effects such as a small friction coefficient, and is suitable as a material for bundling optical fiber strands into a tape-like structure. The curable bundling material for optical fibers used in the present invention is not limited to the tape-shaped structure, but a material for arranging a plurality of optical fiber strands in a circular shape around the tensile strength wire to form a unit (unit It can also be suitably used as a chemical material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Bessho 2-11-24 Tsukiji, Chuo-ku, Tokyo Within Nippon Synthetic Rubber Co., Ltd. (72) Inventor Ken Sugimoto 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (72) Inventor Igarashi Victory 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (72) Inventor Timothy E. Bishop United States 60102 Argon Kin Riverwood Drive 1720 Illinois

Claims (1)

[Claims] 1. A tape-structured optical fiber core wire in which a plurality of optical fiber wires coated with a primary and secondary coating made of resin are arranged in a plane and hardened with a cured product of a bundling material to form a tape having a rectangular cross section. Wherein the bundling material comprises the following components (a), (b) and (c): (a) one or more polyether polyurethanes having an ethylenically unsaturated group, and It comprises a polyether polyurethane containing 40 to 85% by weight of a tetramethyleneoxy structure, (b) an ethylenically unsaturated monomer and (c) a polymerization initiator, and the coefficient of dynamic friction between the cured product and polyethylene is 0. A tape structure optical fiber core characterized by being 4 or less.