Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
  • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
  • C08F290/06—Polymers provided for in subclass C08G
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
  • C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
  • C08F290/12—Polymers provided for in subclasses C08C or C08F
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
  • C08L33/16—Homopolymers or copolymers of esters containing halogen atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
  • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
  • G02B1/045—Light guides
  • G02B1/048—Light guides characterised by the cladding material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2312/00—Crosslinking
  • C08L2312/06—Crosslinking by radiation

Definitions

• the present invention relates to a radiation curable liquid resin composition for forming a cladding layer of a polymer-clad optical fiber.
• An optical fiber is suitable for high-capacity and high-speed digital signal communications and has been widely used for information communication cables instead of electric wires made of a metal.
• An optical fiber having the most basic structure has a core formed of glass, quartz, or a transparent resin, a cladding layer provided in contact with the exterior of the core, and a polymer coating layer provided over the cladding layer and formed of a radiation-curable resin or the like.
• an all-silica optical fiber of which the core and the cladding layer are formed of quartz (silica) is widely used.
• the diameter of the core of an optical fiber is about 50 micrometers (hereinafter micrometers will be abbreviated " ⁇ m")
• the total diameter of the core and the cladding layer is about 125 ⁇ m
• the total diameter of the core, the cladding layer, and the resin coating layer is about 250 to 500 ⁇ m.
• Optical modules having optical signal transmission/reception/branch/switching functions and the like have been developed for optical information communications. It is important to connect an optical module and an optical fiber with their optical axes aligned in order to suppress attenuation of optical signals. Since the diameter of the core of an optical fiber is small, as described above, it is difficult to align the optical axes when connecting an optical fiber to an optical module. Therefore, an optical fiber is used of which the core diameter is increased to about 200 ⁇ m. Such a large -diameter optical fiber typically has a cladding layer formed of a curable transparent resin, and is called a polymer-clad optical fiber (or plastic-clad optical fiber or polymer-clad fiber).
• a fluorine -containing UV-curable composition containing a fluorine-containing urethane (me th) aery late, a fluorine -containing (meth)acrylate oligomer, or the like is known, see Patent Document JP-A- 10- 10340;
• Patent Document JP-A- 10- 160947 and Patent Document JP-A- 11- 119036.
• a polymer-clad optical fiber having a core formed of glass or quartz is called a hard polymer-clad optical fiber, and a polymer-clad optical fiber having a core formed of a transparent resin is called a plastic fiber.
• the hard plastic-clad optical fiber is used for communications over a relatively long distance due to high optical transmission efficiency, and the plastic fiber is used for communications over a relatively short distance.
• a curable transparent resin material used for the cladding layer of a polymer-clad optical fiber is required to have a low refractive index and transparency which is stable with time; an appropriate viscosity which ensures an excellent applicability; excellent adhesion to the core; and strength and flexibility represented by the Young's modulus, breaking strength, breaking elongation, and the like, for example.
• the first aspect of the instant claimed invention is a radiation-curable resin composition
• a radiation-curable resin composition comprising:
• R 8 represents a hydrogen atom or a methyl group
• X represents a hydrogen atom or a fluorine atom
• x represents 1 or 2
• y represents an integer from 2 or 8
• the second aspect of the instant claimed invention is a cured film comprising a cured product of the radiation-curable liquid resin composition according to the first aspect of the instant claimed invention.
• the third aspect of the instant claimed invention is polymer-clad optical fiber comprising a core formed of glass, quartz, or a transparent resin and a cladding layer comprising the cured film according to the second aspect of the instant claimed invention and provided in contact with the exterior of the core.
• the fourth aspect of the instant claimed invention is a process of making a polymer-clad optical fiber comprising the steps of A) providing a core of glass, quartz or transparent resin;
• An object of the present invention is to provide a radiation-curable resin composition which has properties suitable as a cladding material for a polymer-clad optical fiber and exhibits a low refractive index, stable transparency, excellent applicability, excellent adhesion to the core, and excellent strength and flexibility.
• the instant claimed invention is a radiation-curable resin composition containing a specific fluorine -containing polymer, a specific fluorine -containing (me th) aery late monomer, and a fluorine-free
• a polymer-clad layer obtained using the resin composition of the present invention has a low refractive index, stable transparency, excellent applicability, excellent adhesion to a core, high strength, and excellent flexibility.
• the present invention provides a radiation-curable resin composition
• a radiation-curable resin composition comprising: (A) 20 to 65 mass% of an ethylenically unsaturated group -containing fluorocopolymer;
• R 8 represents a hydrogen atom or a methyl group
• X represents a hydrogen atom or a fluorine atom
• x represents 1 or 2
• y represents an integer from 2 or 8;
• the ethylenically unsaturated group -containing fluoropolymer (A) is not particularly limited insofar as the polymer has an ethylenically unsaturated group and a fluorine atom.
• a fluorine -containing olefin copolymer having an ethylenically unsaturated group in its side chain is preferable.
• the component (A) provides the composition of the present invention with basic properties necessary for a cladding material of a polymer-clad optical fiber, such as a low refractive index, high mechanical strength, and excellent adhesion to a core formed of glass, quartz, or the like.
• the ethylenically unsaturated group -containing fluoropolymer is obtained by reacting a compound having an ethylenically unsaturated group and an isocyanate group with a hydroxyl group of a hydroxyl group -containing fluoropolymer.
• the compound having an ethylenically unsaturated group and an isocyanate group there are no limitations to the compound having an ethylenically unsaturated group and an isocyanate group insofar as the compound has at least one ethylenically unsaturated group and at least one isocyanate group in the molecule.
• a compound having a (meth)acryloyl group as the ethylenically unsaturated group is preferable due to the capability of easily curing a curable resin composition described later.
• (me th) acrylic acid, (meth)acryloyl chloride, (meth)acrylic anhydride, 2-(meth)acryloyloxyethyl isocyanate, 2-(meth)acryloyloxypropyl isocyanate, and l,l-(bisacryloyloxymethyl)ethyl isocyanate may be used either individually or in combination of two or more.
• Commercially available products of (me th) aery late having an isocyanate group include but are limited to, Karenz MOI, AOI, and BEI (manufactured by Showa Denko K.K.).
• Such a component may be synthesized by reacting a diisocyanate compound and a hydroxyl group -containing (meth)acrylate.
• a diisocyanate compound 2,4-tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, methylene bis(4-cyclohexylisocyanate), and l,3-bis(isocyanatemethyl)cyclohexane are preferable, for example.
• hydroxyl group -containing (me th) aery late 2-hydroxyethyl (meth)acrylate and pentaerythritol tri(meth)acrylate are preferable, for example.
• Hydroxyl group -containing polyfunctional (me th) aery late s are commercially available as HEA (manufactured by Osaka Organic Chemical Industry, Ltd.), KAYARAD DPHA and PET-30 (manufactured by Nippon Kayaku Co., Ltd.), and Aronix M-215, M-233, M-305, and M-400
• the hydroxyl group -containing fluoropolymer preferably contains the
• m represents 1 to 8, preferably 1 to 4, and more
• n 1 to 20, preferably 3 to 12, more preferably 4 to 8,
• the structural unit (a) may be introduced using a compound shown by
• examples of such a compound include, but are not limited to, perfluorooctylethyl (meth)acrylate and the like.
• R 1 , m, and n are the same as R 1 , m, and n in the formula (1).
• the content of the structural unit (a) in the hydroxyl group-containing fluoropolymer is 20 to 70 mol%, preferably 30 to 60 mol%, and more preferably 35 to 60 mol% based on 100 mol% of the structural units (a), (b), and (c 1 ) in total. If the content of the structural unit (a) exceeds 70 mol%, the solubility of the hydroxyl group -containing fluoropolymer decreases, whereby the polymer may precipitate during a polymerization reaction or may become insoluble in a solvent.
• R 3 has an aliphatic structure
• the Young's modulus of the cured product obtained by curing the composition of the present invention becomes too small.
• R 3 has an aromatic structure
• the Young's modulus of the cured product obtained by curing the composition of the present invention becomes too large.
• the cured product exhibits properties inappropriate for a cladding layer.
• R 3 is a monovalent organic group having an alicyclic structure
• the Young's modulus and the refractive index of the cured product are well-balanced.
• the alicyclic structure used herein includes a heterocyclic structure.
• the structural unit (b) may be introduced using a compound shown by the following formula (8) as a polymerization component.
• Suitable examples of such compounds include, but are not limited to, cyclohexyl (meth) aery late, dicy elope ntanyl (meth)acrylate, isobornyl (meth) aery late, dicyclopentenyl (meth) aery late, and the like.
• H 2 C C
• R 2 and R 3 are the same as R 2 and R 3 in the formula (2).
• the content of the structural unit (b) in the hydroxyl group-containing fluoropolymer is 10 to 70 mol%, preferably 20 to 60 mol%, and more preferably 20 to 55 mol% based on 100 mol% of the structural units (a), (b), and (c') in total. If the content of the structural unit (b) exceeds 70 mol%, the refractive index of the fluoropolymer increases. If the content of the structural unit (b) is less than 20 mol%, the solubility of the fluoropolymer decreases.
• the structural unit (c') may be introduced using a compound shown by the following formula (9) as a polymerization component.
• Suitable examples of such compounds include, but are not limited to, 2-hydroxyethyl (meth)acrylate, 2-hydroxybutyl (meth) aery late, 2-hydroxypropyl (me th) aery late, caprolactone (meth)acrylate, polyethylene glycol (meth)acrylate, polypropylene glycol (meth) aery late, and the like.
• R 7 and v are the same as R 7 and v in the formula (6).
• the content of the structural unit (c') in the hydroxyl group -containing fluoropolymer is 5 to 70 mol%, preferably 10 to 40 mol%, and more preferablyl to 20 mol% based on 100 mol% of the structural units (a), (b), and
• the ethylenically unsaturated group -containing fluoropolymer (the component (A)) is obtained by reacting a hydroxyl group of the structural unit (c') of the hydroxyl group -containing fluoropolymer with a reactive group such as an isocyanate group of the compound having an ethylenically unsaturated group and the isocyanate group.
• a reactive group such as an isocyanate group of the compound having an ethylenically unsaturated group and the isocyanate group.
• the number of moles of the isocyanate groups of the compound having an ethylenically unsaturated group and the isocyanate group is preferably 0.5 to 1.0 times the number of moles of the hydroxyl groups of the hydroxyl group -containing fluoropolymer.
• the ethylenically unsaturated group -containing fluoropolymer (A) possesses, in addition to the structural unit (a) and the structural unit (b) originating from the hydroxyl group -containing fluoropolymer, the following structural unit (c) which is produced by the reaction of the structural unit (c') of the hydroxyl group -containing fluoropolymer with the compound having an ethylenically unsaturated group and an isocyanate group.
• R 4 represents a hydrogen atom or a methyl group
• R 5 represents a group shown by the following formula (4) or (5)
• v represents an integer from 1 to 20.
• R 6 represents a hydrogen atom or a methyl group.
• group -containing fluorocopolymer is 20 to 70 mol%, preferably 30 to 60 mol%,
• the content of the structural unit (b) in the ethylenieally unsaturated group -containing fluorocopolymer is 10 to 70 mol%, preferably 20 to 60 mol%, and more preferably 20 to 55 mol% based on 100 mol% of the structural units
• the content of the structural unit (c) in the ethylenieally unsaturated group-containing fluorocopolymer is 25 to 70 mol%, preferably 5 to 40 mol%, and more preferably 5 to 20 mol% based on 100 mol% of the structural units (a), (b), and (c) in total for the same reasons as the hydroxyl group-containing fluorine -containing copolymer. If the content of the structural unit (c) exceeds 70 mol%, the refractive index of the fluoropolymer increases. If the content of the structural unit (c) is less than 5 mol%, the physical strength of the cured product decreases.
• the molecular weight of the ethylenieally unsaturated group-containing fluorocopolymer in terms of a polystyrene-reduced number average molecular weight determined by gel-permeation chromatography (GPC) using tetrahydrofuran as a solvent, is preferably 5000 to 500,000. If the number average molecular weight is less than 5000, the cured product may have reduced mechanical strength. If the number average molecular weight is more than 500,000, the composition may have such a high viscosity that a coating operation is difficult.
• GPC gel-permeation chromatography
• the polystyrene -reduced number average molecular weight of the ethylenically unsaturated group -containing fluorocopolymer is more preferably 10,000 to 300,000, and still more preferably 10,000 to 100,000.
• the ethylenically unsaturated group -containing fluorocopolymer (component (A)) is added to the composition in an amount of usually 20 to 65 mass%, preferably 20 to 50 mass%, and particularly preferably 30 to 40 mass%. If the amount of the ethylenically unsaturated group-containing fluorocopolymer is less than 20 mass%, the viscosity of the composition becomes too low, whereby the applicability may decrease when producing optical fibers.
• Component (B) is a compound shown by the following formula (10).
• R 8 represents a hydrogen atom or a methyl group
• X represents a hydrogen atom or a fluorine atom
• x represents 1 or 2
• y represents an integer from 2 or 8.
• the component (B) is added to ensure the solubility of the component (A) together with the component (C) and to reduce the refractive index of the cured product.
• the component (B) is not particularly limited insofar as the component (B) is a compound shown by the formula (10).
• Specific examples of the component (B) include 2-perfluorooctylethyl (meth) aery late, 2,2,3,3-tetrafluoropropyl (meth) aery late, IH, lH,5H-octafluoropentyl (meth)acrylate, and the like.
• Suitable commercially available products include, but are not limited to, Viscoat 17F, 4F, 8F (manufactured by Osaka Organic Chemical Industry, Ltd.) and the like. Of these, 2-perfluorooctylethyl (meth)acrylate is preferable due to excellent capability of dissolving the component (A) and easy availability.
• the component (B) is added to the composition in an amount of usually 20 to 60 mass%, preferably 20 to 50 mass%, and particularly preferably 20 to 45 mass%. If the amount of the component (B) is less than 20 mass%, the solubility of the component (A) may be impaired, and the refractive index of the cured product may increase. If the amount of the component (B) exceeds 70 mass%, the viscosity of the composition decreases, whereby applicability is impaired.
• the mutual solubility of the ethylenically unsaturated group -containing fluorocopolymer (component (A)) and a (meth) aery late monomer is generally poor.
• the solubility of the component (A) is improved using the component (B) in combination with the component (C), whereby a homogeneous composition can be obtained.
• the mass ratio of the components (B) and (C) is preferably 2:3 to 5:1, and more preferably 2:3 to 4:1.
• (C) Compound which does not have aromatic structure and polar group and contains two or more ethylenically unsaturated groups
• the component (C) added to the composition of the present invention is a compound other than the components (A) and (B) which does not have an aromatic structure and a polar group and contains two or more ethylenically unsaturated groups. Since the component (C) does not have a polar group, the component (C) can increase the solubility of the component (A) to produce a homogeneous composition by using the component (C) in combination with the component (B). Since the component (C) does not have an aromatic structure, the resulting cured product has a low refractive index.
• polar group used herein includes dissociable groups such as a carboxyl group and an amino group, polarizable groups such as a carbonyl group and an alkylene oxide group having three or less carbon atoms, but excludes a hydroxyl group. There are no specific limitations to the component (C) insofar as the above conditions are satisfied.
• component (C) include aliphatic structure -containing (me th) aery late s such as neopentyl glycol di(meth)acrylate, neopentyl glycol hydroxypivalate di(meth) aery late, trimethylolprop ane tri(meth) aery late , trimethylolprop anetrioxyethyl (meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, polyester di(meth)acrylate, 1,4-butanediol di(meth)acrylate, and 1,6-hexanediol di(meth)acrylate, and the like.
• aliphatic structure -containing (me th) aery late s such as neopentyl glycol di(meth)acrylate, neopentyl glycol hydroxypivalate di(meth) a
• a monofunctional or polyfunctional aliphatic structure -containing (meth)acrylate is preferable, with neopentyl glycol di(meth) aery late or neopentyl glycol hydroxypivalate di(meth)acrylate being particularly preferable.
• the component (C) may be used either individually or in combination of two or more.
• the component (C) is added to the composition in an amount of usually 10 to 35 mass%, preferably 15 to 35 mass%, and particularly preferably 15 to 30 mass%. If the amount of the component (C) is less than 10 mass%, the solubility of the component (A) may be impaired. If the amount of the component (C) exceeds 35 mass%, the amounts of the components (A) and (B) are reduced, resulting in an increased refractive index of the cured product and poor adhesion to a core.
• composition of the present invention may further contain (D) a (meth)acrylic acid or a (meth)acrylic acid dimer.
• the addition of the component (D) improves adhesion between a cladding layer and a core formed of glass or quartz.
• the component (D) is added to the composition in an amount of usually 0 to 10 mass%, and preferably 1 to 7 mass%. If the amount of the component (D) exceeds 10 mass%, the storage stability of the composition may be impaired.
• a photoinitiator (E) When curing the composition of the present invention by applying light such as ultraviolet rays, it is preferable to add a photoinitiator (E).
• the photoinitiator (E) include 1 -hydroxy cyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 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 methyl ketal, l-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-l-one, 2-hydroxy-2-methyl-l-phenylpropan-l-one, thioxanethone, diethylthioxanthone, 2-isopropylthioxanthone, 2-chlorothio
• a photosensitizer may be added when using the photoinitiator (E).
• Suitable examples of photosensitizers include, but are not limited to, the photosensitizer, triethylamine, diethylamine, N-methyldiethanoleamine, ethanolamine, 4-dimethylaminobenzoic acid, 4-methyl dimethylaminobenzoate, 4-ethyl dimethylaminobenzoate, 4-isoamyl dimethylaminobenzoate; Ubecryl P102, 103, 104, 105 (all manufactured by UCB); and the like.
• the photoinitiator may be used in combination with a heat polymerization initiator.
• the initiator (E) is added to the composition in an amount of preferably 0.1 to 10 mass%, and particularly preferably 0.3 to 7 mass%.
• a compound (F) other than the components (A), (B), and (C) which does not have an aromatic structure and a polar group and contains one ethylenically unsaturated group may be added to the composition of the present invention insofar as the effects of the present invention are not impaired.
• a compound which does not have an aromatic structure and a polar group and contains one ethylenically unsaturated group include vinyl group -containing lactams such as N-vinylpyrrolidone and N-vinylcaprolactam; vinyl ethers such as hydroxybutyl vinyl ether, lauryl vinyl ether, cetyl vinyl ether, and 2-ethylhexyl vinyl ether; acrylamides such as diacetone(meth)acrylamide, isobutoxymethyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide,
• the component (F) is added to the composition in an amount of usually 0 to 30 mass%, preferably 0 to 25 mass%, and particularly preferably 0 to 20 mass%. If the amount of the component (F) exceeds 30 mass%, the transparency of the composition and its cured product may be impaired.
• An ethylenically unsaturated group-containing compound (G) other than the components (A), (B), (C), and (F) may be added to the composition of the present invention insofar as the effects of the present invention are not impaired.
• the amount of the component (G) is preferably 5 mass% or less based on 100 mass% of the composition.
• composition of the present invention may optionally be added to the composition of the present invention insofar as the characteristics of the present invention are not adversely affected.
• the viscosity, at 25 0 C, of the composition of the present invention is preferably from about 0.8 to about 6.0 Pa s, and particularly preferably from about 1.5 to about 5.0 Pa s.
• the radiation curable composition After the radiation curable composition is prepared it may be applied to the core of an optical fiber by following the steps of the following process:
• step D) the curable liquid resin composition of the present invention is cured by applying radiation. It is possible to cure the curable liquid resin composition by applying radiation and heat in combination.
• radiation refers to infrared rays, visible rays, ultraviolet rays, X-rays, electron beams, ⁇ -rays, B-rays, ⁇ -rays, and the like.
• the cured product of the curable liquid resin composition of the present invention preferably has a Young's modulus from about 200 MPa to about 500 MPa.
• the composition is preferably applied to a thickness of from about 100 ⁇ m to about 350 ⁇ m.
• a cable layer formed of a thermoplastic resin may be provided on the outer surface of an optical fiber upjacket layer.
• Hydroxyl group -containing fluoropolymers were obtained in the same manner as in Preparation Example 1 according to Table 1. The conversion rate of the monomer was 95% or more in each case.
• Table 2 shows the amounts (mol%) of the components (a), Qo), and (c) provided that the total amount of the components (a), (b), and (c) is 100 mol%.
• the component (a) is 2-perfluorooctylethyl acrylate
• the component (b) is isobornyl acrylate
• the component (c) is hydroxyethyl acrylate.
• Ethylenically unsaturated group -containing fluoropolymers 2 to 5 were obtained in the same manner as described above using the hydroxyl group-containing fluoropolymers 2 to 5, respectively.
• the viscosity at 25 0 C of the compositions obtained in the examples and comparative examples was measured using a B-type viscometer.
• the curable liquid resin composition was applied to a glass plate using an applicator bar with a gap size of 250 ⁇ m.
• the composition was cured in nitrogen by applying ultraviolet rays at a dose of 1 J/cm 2 to obtain a Young's modulus measurement film.
• the film was cut into a sample in the shape of a strip with a width of 6 mm and a length of 25 mm (portion to be tensed).
• the sample was subjected to a tensile test at a temperature of 23 0 C and a humidity of 50%.
• the Young's modulus was calculated from the tensile strength at a tensile rate of 1 mm/min. and a strain of 2.5%.
• the resin composition was applied to a glass plate to a thickness of 200 ⁇ m using an applicator bar.
• Ultraviolet rays were applied to the composition in nitrogen at a dose of 1.0 J/cm 2 to obtain a specimen.
• the refractive index at 25 0 C of the specimen was measured using an Abbe refractometer (manufactured by Atago Co., Ltd.) in accordance with JIS K7105. In the Examples of the instant claimed invention the Refractive Index is reported to be from about 1.400 to about 1.430.
• the total light transmittance of the cured film was measured in accordance with JIS K7105 using a color haze meter (manufactured by Suga Test Instruments Co., Ltd.). The measurement was carried out using a cured film immediately after preparation and a cured film after allowed to stand at 12O 0 C for 72 hours. In Table 3, "whitening" indicates that each component of the composition was not completely dissolved so that the composition was cloudy when observed with the naked eye. 6.
• the adhesion stability of the cured products of the compositions obtained in the examples and comparative examples was evaluated.
• the liquid composition was applied to a sliding glass plate using an applicator with a gap size of 381 ⁇ m.
• the applied liquid composition was irradiated with ultraviolet rays at a dose of 0.1 J/cm 2 in a nitrogen atmosphere to obtain a cured film with a thickness of about 200 ⁇ m.
• the cured film on a slide was allowed to stand at a temperature of 23 0 C and a relative humidity of 50% for 24 hours.
• a sample in the shape of a strip was prepared from the cured film so that the portion to be tensed had a width of 10 mm.
• the sample was subjected to an adhesion test in accordance with JIS Z0237 using a tensile tester.
• the adhesion was calculated from the tensile strength at a tensile rate of 50 mm/min.
• "broke” indicates that the cured film and the slide were not separated and the cured film broke due to high adhesion.
• the composition was applied to a quartz glass plate using an applicator with a gap size of 200 ⁇ m.
• the applied composition was irradiated with ultraviolet rays by using a 3.5 kW metal halide lamp ("SMX-3500/F-OS" manufactured by ORC Co., Ltd.) at doses of 20 mJ/cm 2 and 1.0 J/cm 2 in air to form a cured film.
• SMX-3500/F-OS manufactured by ORC Co., Ltd.
• the Young's modulus (MPa) of the specimen was measured using a tensile tester. A value obtained by dividing the Young's modulus at a UV dose of 20 mJ/cm 2 by the Young's modulus at a UV dose of U/cm2 was taken as the curing speed. [Table 3]
• Viscoat 17F 2-perfluorooctylethyl (meth)acrylate (manufactured by Osaka
• Irgacure 184 1 -hydroxy cyclohexyl phenyl ketone (manufactured by Ciba Specialty Chemicals Co., Ltd.)
• Kynar ADS copolymer of VDF/TFE/HFP (vinylidene fluoride, tetrafluoroethylene, and hexafiuoropropylene) (manufactured by Arkema Co.)
• the cured product maintained excellent transparency even after having been exposed to a high temperature.
• the composition also exhibited excellent adhesion to quartz as a core material.

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• 2007
  • 2007-02-27 JP JP2007046688A patent/JP2008208226A/ja not_active Withdrawn
• 2008
  • 2008-02-27 WO PCT/NL2008/050117 patent/WO2008105659A1/en active Application Filing

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