JP2013073029A - Flame-retardant plastic optical fiber ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve flame retarding of an optical fiber ribbon by using plastic optical fibers.SOLUTION: A flame-retardant plastic optical fiber ribbon comprises a plurality of coated plastic optical fibers arranged parallel with each other and an overall covering in the outer periphery of the plurality of coated plastic optical fibers. The overall covering contains: at least one metallic compound selected from a group comprising metal hydroxides and metallic oxides; at least one compound selected from a group comprising red phosphorus, ultraviolet curable phosphorus compounds, and nitrogen-containing phosphate; and an ultraviolet curable resin. An addition amount of the metallic compound is in a range of 5 pts.wt. or more and 70 pts.wt. or less to the ultraviolet curable resin.

Description

  The present invention relates to a plastic optical fiber ribbon, and more particularly to a plastic optical fiber ribbon having flame retardancy.

  In recent years, with the development of advanced information communication, an optical fiber network is stretched around a communication trunk line, and high-speed and large-capacity communication by optical transmission has become widespread. A single-mode silica-based optical fiber is used for such a communication trunk line for various reasons such as a reduction in optical transmission loss, and high-speed data transmission of several tens of gigabits is possible. However, when connecting to the data communication device in the office or home from this silica optical fiber of the communication trunk line, when connecting using the same silica optical fiber, the flexibility is poor and handling is easy. In addition to the disadvantages, the silica optical fiber core has a very small diameter of about a few μm, so there is a problem that it costs a lot to branch and connect, leading to data communication devices in the office or in each home. Has become one of the obstacles to the spread of connections.

In order to facilitate the branching and connection from such communication-system trunk optical fibers to data communication devices in offices or homes, the core branches and connects with a larger diameter than silica-based optical fibers. It has been proposed to use a plastic optical fiber which is excellent in flexibility, rich in flexibility and easy to handle.
Currently, FTTH (Fiber to the Home) projects are being promoted, and the demand for user cables used around homes and offices is expected to increase dramatically. A cable or ribbon structure is required.

In the case of a plastic optical fiber ribbon, once a fire occurs, it spreads along the cable line, and the fire expands vertically and horizontally. ing. A plastic optical fiber ribbon is usually a bundle of a plurality of plastic optical fibers that are bundled together. Thermoplastic resins, thermosetting resins, and ultraviolet curable resins that are used as the resin that forms these batch coatings. The flame retardancy of was not enough.
For example, Patent Document 1 describes an invention related to an optical fiber ribbon using a quartz or glass-based optical fiber, and the calorific value when an ultraviolet curable resin is measured with a cone calorimeter is 800 KW / m ² or less. It is described that the flame retardancy of the optical fiber ribbon is improved by using the flame retardant resin. However, it was not clear how to achieve a flame-retardant resin having a calorific value of 800 KW / m ² or less. Moreover, the flame retardancy improvement of the optical fiber ribbon at the time of using a plastic optical fiber is not achieved.

JP 2005-326567 A

  Therefore, the present invention achieves flame retardancy of an optical fiber ribbon using a plastic optical fiber.

  The present invention provides a plastic optical fiber ribbon in which a plurality of plastic optical fiber cores are arranged in parallel, and a collective coating is provided on the outer periphery of the plurality of optical fiber cores, wherein the collective coating is a metal hydroxide. At least one metal compound selected from the group consisting of an oxide and a metal oxide, at least one compound selected from the group consisting of red phosphorus, an ultraviolet curable phosphorus compound and a nitrogen-containing phosphate, and an ultraviolet curable resin And a flame retardant plastic optical fiber ribbon in which the addition amount of the metal compound is 5 parts by weight or more and 70 parts by weight or less with respect to the ultraviolet curable resin.

  According to the present invention, it is possible to achieve flame retardancy of an optical fiber ribbon using a plastic optical fiber.

FIG. 1 is a sectional view showing a flame-retardant plastic optical fiber ribbon of the present invention.

The present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing a flame-retardant plastic optical fiber ribbon of the present invention. A plastic optical fiber ribbon 21 shown in FIG. 1 has a plurality of plastic optical fiber cores 11 arranged in parallel, and the outer periphery of the plurality of plastic optical fiber cores 11 is collectively covered. A plastic optical fiber core wire 11 shown in FIG. 1 is obtained by coating the periphery of a plastic optical fiber 1 with a reinforcing layer 2 and covering the periphery of the reinforcing layer 2 with an ultraviolet curable resin 3. However, the plastic optical fiber core wire 11 in the present invention is not limited as long as the periphery of the plastic optical fiber 1 is covered with the reinforcing layer 2, and the periphery of the reinforcing layer 2 is not covered with the ultraviolet curable resin 3. It may be.
The individual components of the flame retardant plastic optical fiber ribbon of the present invention are described below.

  Examples of the plastic optical fiber 1 include a refractive index distribution type (GI type) plastic optical fiber, a stepped refractive index type (SI type) plastic optical fiber, a single mode plastic optical fiber, a multi-core plastic optical fiber, and the like. Any of these may be used as the fiber 1.

The GI plastic fiber (hereinafter referred to as GI-POF) is a plastic optical fiber having a distribution of refractive index in the cross-sectional direction. That is, since GI-POF is configured by a refractive index distribution in which the refractive index is high at the center in the cross-sectional direction and gradually decreases, the light traveling in the longitudinal direction in GI-POF has a refractive index. Under the influence, it concentrates near the center of the GI-POF. This realizes high-speed and large-capacity transmission capability.
GI-POF has a smaller mode dispersion than SI type plastic optical fiber (hereinafter referred to as SI-POF), and is particularly suitable for high-speed data transmission of a class of several gigabits or more.

  Examples of the material of the plastic optical fiber 1 in the present invention include polymethyl methacrylate resin and polycarbonate resin, and an optical fiber using such a material can be used as the optical fiber in the present invention. However, the plastic optical fiber made of these materials is made of a resin having a C—H bond in the molecule, so that the harmonic absorption due to the stretching movement of the C—H bond is specified in the infrared or visible light region. The loss occurred in the wavelength region, and the transmission loss in the wavelength region was large. In addition, since these resins have high hygroscopicity, there is a problem that transmission loss varies greatly depending on environmental conditions such as temperature conditions. As a result, it has been impossible to use an infrared wavelength region that enables high-speed transmission of several gigabits in the wavelength region used for optical transmission.

  When such a conventional plastic optical fiber is used for branching and connecting from a silica optical fiber of a communication system trunk line to a data communication device in an office or home, for example, recently, it has been remarkably popular in offices or homes. When used for connection to the Internet, there is a problem that it is difficult to sufficiently meet the demand for high-speed transmission of large-capacity data such as moving images in addition to voice and still images on the Internet.

  The plastic optical fiber 1 in the present invention is preferably a plastic optical fiber made of an amorphous transparent fluororesin having substantially no CH bond. This plastic optical fiber has no absorption in the infrared or visible light region and has particularly excellent characteristics as a plastic optical fiber for communication.

  The amorphous transparent fluororesin is preferably a fluororesin composed of a fluoropolymer having a ring structure in the main chain, particularly a fluororesin composed of a fluoropolymer having a fluorine-containing aliphatic ring structure in the main chain. Examples of such plastic optical fibers made of amorphous fluororesin include GI-POF described in JP-A-8-5848 and JP-A-11-167030 and SI-POF described in JP-A-4-1704. and so on.

The plastic optical fiber is composed of a core-cladding, but is generally used as a plastic optical fiber core wire having a reinforcing layer around the cladding in order to improve reinforcement and mechanical properties. Also in the present invention, the plastic optical fiber core wire 11 in which the periphery of the plastic optical fiber 1, more specifically, the periphery of the clad of the plastic optical fiber 1 is covered with the reinforcing layer 2 is used.
The plastic optical fiber core wire 11 used in the present invention uses a GI-POF made of an amorphous transparent fluororesin having substantially no CH bond as the plastic optical fiber 1. What coated the circumference | surroundings with the hot-melt resin as the reinforcement layer 2 is preferable.

  In the plastic optical fiber core wire 11 of the present invention, in order to form a primary coat for reducing external force, a secondary coat for resistance to external force, a color coat for color identification, and the like around the reinforcing layer 2. What was further coat | covered with the ultraviolet curable resin 3 of 1 or more layers is more preferable.

In the flame-retardant plastic optical fiber ribbon 21 of the present invention, the collective coating 4 applied to the outer periphery of a plurality of plastic optical fiber cores 11 arranged in parallel is at least one selected from the group consisting of metal hydroxides and metal oxides. It contains at least one compound selected from the group consisting of a seed metal compound, red phosphorus, an ultraviolet curable phosphorus compound and a nitrogen-containing phosphate, and an ultraviolet curable resin.
Here, at least one metal compound selected from the group consisting of a metal hydroxide and a metal oxide, and a group consisting of red phosphorus, an ultraviolet curable phosphorus compound and a nitrogen-containing phosphate, included in the collective coating 4 At least one compound selected from the group acts as a flame retardant.

Among the flame retardants included in the collective coating 4, at least one metal compound selected from the group consisting of metal hydroxides and metal oxides is a flame retardant mainly having an endothermic effect when pyrolyzing and releasing moisture. is there. In addition, at least one compound selected from the group consisting of red phosphorus, an ultraviolet curable phosphorus compound, and a nitrogen-containing phosphate is a flame retardant mainly composed of a heat insulating layer called char after dehydration from a resin. The nitrogen-containing phosphate is also a flame retardant that mainly generates a foamed heat insulating film by generating nitrogen gas or the like.
In the present invention, in order to use two or more kinds of flame retardants having different flame retardant effects, at least one metal compound selected from the group consisting of metal hydroxides and metal oxides, red phosphorus, and ultraviolet curable phosphorus compounds And at least one compound selected from the group consisting of nitrogen-containing phosphates.

  The at least one metal compound selected from the group consisting of metal hydroxides and metal oxides is one selected from aluminum hydroxide, magnesium hydroxide, zinc borate, zinc stannate, titanium oxide, silicon oxide, or Two or more types can be used. From the viewpoint of large endothermic action, aluminum hydroxide and magnesium hydroxide are preferable, and aluminum hydroxide is more preferable. The addition amount of these metal compounds is 5 parts by weight or more and 70 parts by weight or less with respect to 100 parts by weight of the ultraviolet curable resin contained in the collective coating 4. The addition amount of these metal compounds is preferably 10 parts by weight or more and 60 parts by weight or less. If the amount is less than 5 parts by weight with respect to 100 parts by weight of the ultraviolet curable resin, the flame retardant effect cannot be exhibited. If the amount is more than 70 parts by weight, thermal decomposition occurs rapidly. As a spark, it scatters and the UL VW-1 test fails.

  Due to the dispersibility in the batch coating mixture before UV curing, at least one metal compound selected from the group consisting of metal hydroxides and metal oxides is fine particles having a particle size of 0.05 μm to 100 μm. Preferably, fine particles having a particle size of 0.1 μm to 50 μm are more preferable. Particles smaller than 0.05 μm may make it difficult to form the collective coating 4 on the outer periphery of the plurality of plastic optical fiber cores 11 because the viscosity of the collective coating mixture before UV curing becomes too high. , Particles larger than 100 μm cause precipitation due to their own weight, and the storage stability of the batch coating mixture before UV curing becomes poor. At least one metal compound selected from the group consisting of metal hydroxides and metal oxides is formed with vinyl silane, acrylic silane, or methacryl silane on the surface in order to control dispersibility in the batch coating liquid mixture before UV curing. You may make it react.

As red phosphorus, fine particles having a particle size of 0.5 μm to 50 μm are preferable, and fine particles having a particle size of 1 μm to 20 μm are more preferable in order to improve dispersibility in the batch coating liquid before UV curing. .
The amount of red phosphorus added is preferably 5 parts by weight or more and 30 parts by weight or less, and more preferably 5 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the ultraviolet curable resin contained in the collective coating 4.

  The particle size of at least one metal compound selected from the group consisting of metal hydroxides and metal oxides, and red phosphorus is the particle size of a laser diffraction / scattering method in the form of a dispersion dispersed in an appropriate solvent. It can be determined using a measuring device (Microtrack BlueRaytrac, Nikkiso Co., Ltd.).

（１）
式（１）中、Ｒは水素またはメチル基であり、Ｒ’は水素、炭素数１〜１８のアルキル基またはフェニル基であり、Ｘは２価の有機基であり、Ｙはメチレン基または単結合であり、ａは０〜３の整数、ｂは０＜ａ≦３となる値、ｃ＝３−ｂとなる数を表わす。
紫外線硬化後の一括被覆４の物性をｂで制御することが可能である。Ｒ’は水素または炭素数１〜６のアルキル基が好ましく、炭素数１〜６のアルキル基がより好ましい。Ｘは炭素数２〜１２のアルキレン基が好ましく、炭素数２〜６のアルキレン基がより好ましい。
窒素含有リン酸塩紫外線硬化型リン化合物の添加量が、一括被覆４に含まれる紫外線硬化型樹脂１００重量部に対して５重量部以上４０重量部以下が好ましく、５重量部以上３０重量部以下がより好ましい。 The ultraviolet curable phosphorus compound is preferably a compound represented by the following formula (1).

(1)
In Formula (1), R is hydrogen or a methyl group, R ′ is hydrogen, an alkyl group having 1 to 18 carbon atoms, or a phenyl group, X is a divalent organic group, and Y is a methylene group or a simple group. A is an integer of 0 to 3, b is a value satisfying 0 <a ≦ 3, and a number satisfying c = 3-b.
It is possible to control the physical properties of the collective coating 4 after UV curing with b. R ′ is preferably hydrogen or an alkyl group having 1 to 6 carbon atoms, more preferably an alkyl group having 1 to 6 carbon atoms. X is preferably an alkylene group having 2 to 12 carbon atoms, and more preferably an alkylene group having 2 to 6 carbon atoms.
The addition amount of the nitrogen-containing phosphate UV curable phosphorus compound is preferably 5 parts by weight or more and 40 parts by weight or less, preferably 5 parts by weight or more and 30 parts by weight or less with respect to 100 parts by weight of the UV curable resin included in the batch coating 4. Is more preferable.

The nitrogen-containing phosphate includes at least one phosphoric acid species selected from the group consisting of phosphoric acid, pyrophosphoric acid and polyphosphoric acid, and at least one amine species selected from the group consisting of ammonia, melamine, ethylenediamine and piperazine The thing containing these is preferable. This includes ammonia phosphate, melamine phosphate, ethylenediamine phosphate, piperazine phosphate, ammonia pyrophosphate, melamine pyrophosphate, ethylenediamine pyrophosphate, piperazine pyrophosphate, ammonia polyphosphate, melamine polyphosphate, polyphosphate One kind or two or more kinds selected from ethylenediamine and piperazine polyphosphate can be used. Of these, polyphosphates are preferable, and ammonium polyphosphate and melamine polyphosphate are particularly preferable because they have a large flame retardant effect due to the formation of char and foam heat insulating film.
The addition amount of the nitrogen-containing phosphate is preferably 5 parts by weight or more and 40 parts by weight or less, and more preferably 5 parts by weight or more and 30 parts by weight or less with respect to 100 parts by weight of the ultraviolet curable resin contained in the batch coating 4.

  The ultraviolet curable resin used for the collective coating 4 is preferably made of a liquid composition comprising at least an acrylic oligomer, an acrylic monomer, and an ultraviolet reactive initiator. Further, acrylic oligomers and acrylic monomers are used in combination by selecting the crosslink density and the balance of hydrophilic group / hydrophobic group in consideration of the physical properties of the target collective coating 4. In addition, the ultraviolet reaction initiator is used in consideration of the type, the amount of addition, and the degree of dispersion so that the surface of the collective coating 4 and the curability in the depth direction can be dealt with simultaneously.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not limited by the following description.

[Example 1]
(Batch cover)
Weigh out 150.5 g (100 parts by weight) of an ultraviolet curable resin (Desolite R3194, JSR Corporation) in a plastic container, and then add 30.1 g (20 parts by weight) of aluminum hydroxide powder (APYRAL 40VS1, Nabaltec AG) and red 15.0 g (10 parts by weight) of phosphorus (Nova Excel 140F, Rin Chemical Co., Ltd.) was added. The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
(Plastic optical fiber ribbon manufacturing method)
The ribbon optical fiber 11 is made of GI-POF (full fluorine type GI-POF, core diameter 80 μmΦ, wire diameter 200 μmΦ: “FONTEX” manufactured by Asahi Glass Co., Ltd.), and the outer periphery of the GI-POF. The first primary coat coated with a thickness of 25 μm and the second secondary coat coated with a thickness of 25 μm on the outer periphery of the primary coat. Four plastic optical fiber cores 11 are arranged in parallel, and the outer periphery is coated with the pre-ultraviolet curing batch coating mixture prepared at the same time, and simultaneously irradiated with ultraviolet rays (high pressure mercury lamp lamp: 3.5 kW / cm ² , The output was 50%, the linear velocity was 50 m / min, and the collective coating 4 was formed to obtain a plastic optical fiber ribbon 21. The plastic optical fiber ribbon 21 of this embodiment has a ribbon thickness of 0.3 mm and a ribbon width of 1.1 mm.
(Flame retardance evaluation method)
The flame retardancy evaluation method was performed according to UL 1581 (Underwriters Laboratories) (UL VW-1).

[Example 2]
Weigh out 150.9 g (100 parts by weight) of an ultraviolet curable resin (Desolite KF2713, JSR Corporation) in a plastic container, and then add 30.1 g (20 parts by weight) of aluminum hydroxide powder (APYRAL 40VS1, Nabaltec AG) and red 15.5 g (10 parts by weight) of phosphorus (Nova Excel 140F, Rin Chemical Industry Co., Ltd.) was added. The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

Example 3
Weigh out 149.7 g (100 parts by weight) of an ultraviolet curable resin (Desolite R3194, JSR Corporation) in a plastic container, and then add 30.0 g (20 parts by weight) of aluminum hydroxide powder (APYRAL 200SM, Nabaltec AG) and red. 14.7 g (10 parts by weight) of phosphorus (Nova Excel 140F, Rin Chemical Industry Co., Ltd.) was added. The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

Example 4
Ultraviolet curable resin (Desolite R3194, JSR Corporation) 151.0 g (100 parts by weight) was weighed into a plastic container, and 14.9 g (10 parts by weight) of aluminum hydroxide powder (APYRAL 40VS1, Nabaltec AG), red phosphorus (Nova Excel 140F, Rin Kagaku Kogyo Co., Ltd.) 15.4 g (10 parts by weight) and phosphoric acid triacrylate (Biscoat 3PA, Osaka Organic Chemical Industry Co., Ltd.) 29.7 g (20 parts by weight) were added. Was added. The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

Example 5
Weigh out 150.3 g (100 parts by weight) of an ultraviolet curable resin (Desolite R3194, JSR Corporation) in a plastic container, and then add 60.1 g (40 parts by weight) of aluminum hydroxide powder (APYRAL 40VS1, Nabaltec AG) and red 29.9 g (20 parts by weight) of melamine phosphopolyphosphate (Fosmel, Nissan Chemical Industries, Ltd.) was added. The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

[Comparative Example 1]
An ultraviolet curable resin (Desolite R3194, JSR Corporation) 151.6 g (100 parts by weight) was weighed into a plastic container to obtain a batch coating mixture before ultraviolet curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

[Comparative Example 2]
150.2 g (100 parts by weight) of an ultraviolet curable resin (Desolite R3194, JSR Corporation) was weighed into a plastic container, and 30.1 g (20 parts by weight) of aluminum hydroxide powder (APYRAL 40VS1, Nabaltec AG) was added thereto. . The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

[Comparative Example 3]
Ultraviolet curable resin (Desolite R3194, JSR Corporation) 149.5 g (100 parts by weight) was weighed into a plastic container, and then aluminum hydroxide powder (APYRAL 40VS1, Nabaltec AG) 120.2 g (80 parts by weight) and red 19.9 g (10 parts by weight) of phosphorus (Nova Excel 140F, Rin Chemical Industry Co., Ltd.) was added. The mixture was thoroughly stirred until it became uniform to obtain a batch coating solution before UV curing.
The plastic optical fiber ribbon manufacturing method and the flame retardancy evaluation method are the same as those in Example 1.

紫外線硬化型樹脂Ａ：デソライトＲ３１９４，ＪＳＲ株式会社
紫外線硬化型樹脂Ｂ：デソライトＫＦ２７１３，ＪＳＲ株式会社
水酸化アルミニウムＡ：ＡＰＹＲＡＬ ４０ＶＳ１，Ｎａｂａｌｔｅｃ ＡＧ
水酸化アルミニウムＢ：ＡＰＹＲＡＬ ２００ＳＭ，Ｎａｂａｌｔｅｃ ＡＧ The results are shown in Table 1.

UV curable resin A: Desolite R3194, JSR Corporation UV curable resin B: Desolite KF2713, JSR Corporation Aluminum hydroxide A: APYRAL 40VS1, Nabaltec AG
Aluminum hydroxide B: APYRAL 200SM, Nabaltec AG

  According to the present invention, it is possible to achieve flame retardancy of an optical fiber ribbon using a plastic optical fiber.

DESCRIPTION OF SYMBOLS 1 Plastic optical fiber 2 Reinforcement layer 3 UV curable resin 4 Collective coating 11 Optical fiber core wire 21 Plastic optical fiber ribbon

Claims (9)

  A plastic optical fiber ribbon in which a plurality of plastic optical fiber cores are arranged in parallel, and a batch coating is provided on an outer periphery of the plurality of optical fiber cores, wherein the batch coating includes a metal hydroxide and a metal oxide An at least one metal compound selected from the group consisting of a product, at least one compound selected from the group consisting of red phosphorus, an ultraviolet curable phosphorus compound and a nitrogen-containing phosphate, and an ultraviolet curable resin, A flame-retardant plastic optical fiber ribbon in which the addition amount of the metal compound is 5 parts by weight or more and 70 parts by weight or less with respect to the ultraviolet curable resin.   The plastic optical fiber ribbon according to claim 1, wherein the plastic optical fiber constituting the plastic optical fiber core wire is a graded index (GI) plastic optical fiber.   The flame-retardant plastic optical fiber ribbon according to claim 1 or 2, wherein the plastic optical fiber constituting the plastic optical fiber core is made of an amorphous transparent fluororesin having substantially no CH bond.   The periphery of the plastic optical fiber constituting the plastic optical fiber core wire is coated with a reinforcing layer, and the periphery of the reinforcing layer is further coated with at least one ultraviolet curable resin. Flame retardant plastic optical fiber ribbon as described in 1.   The at least one metal compound selected from the group consisting of the metal hydroxide and metal oxide is selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate, zinc stannate, titanium oxide, and silicon oxide. The flame-retardant plastic optical fiber ribbon according to any one of claims 1 to 4, comprising at least one kind.   The fine particle having a particle diameter of 0.05 μm to 100 μm is included as at least one metal compound selected from the group consisting of the metal hydroxide and the metal oxide. The flame retardant plastic optical fiber ribbon described.   The flame retardant plastic optical fiber ribbon according to claim 1, wherein the red phosphorus includes fine particles having a particle diameter of 0.5 μm to 50 μm. The flame retardant plastic optical fiber ribbon according to claim 1, comprising a compound represented by the following formula (1) as the ultraviolet curable phosphorus compound.

(1)
(In Formula (1), R is hydrogen or a methyl group, R 'is hydrogen, a C1-C18 alkyl group, or a phenyl group, X is a divalent organic group, Y is a methylene group or (It is a single bond, a represents an integer of 0 to 3, b represents a value satisfying 0 <a ≦ 3, and a number satisfying c = 3-b.)   As the nitrogen-containing phosphate, at least one phosphoric acid species selected from the group consisting of phosphoric acid, pyrophosphoric acid and polyphosphoric acid, and at least one amine species selected from the group consisting of ammonia, melamine, ethylenediamine and piperazine A flame-retardant plastic optical fiber ribbon according to claim 1, comprising a nitrogen-containing phosphate containing.

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