WO2001047824A1 - Optical fiber coating compositions - Google Patents

Optical fiber coating compositions Download PDF

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Publication number
WO2001047824A1
WO2001047824A1 PCT/NL2000/000944 NL0000944W WO0147824A1 WO 2001047824 A1 WO2001047824 A1 WO 2001047824A1 NL 0000944 W NL0000944 W NL 0000944W WO 0147824 A1 WO0147824 A1 WO 0147824A1
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WO
WIPO (PCT)
Prior art keywords
meth
acrylate
compound
optical fiber
dusocyanate
Prior art date
Application number
PCT/NL2000/000944
Other languages
French (fr)
Inventor
Hirofumi Uchida
Zen Komiya
Takashi Ukachi
Original Assignee
Dsm N.V.
Jsr Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dsm N.V., Jsr Corporation filed Critical Dsm N.V.
Priority to AU32450/01A priority Critical patent/AU3245001A/en
Publication of WO2001047824A1 publication Critical patent/WO2001047824A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/104—Coating to obtain optical fibres
    • C03C25/106—Single coatings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/104—Coating to obtain optical fibres
    • C03C25/1065—Multiple coatings
    • 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
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/006—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/67—Unsaturated compounds having active hydrogen
    • C08G18/671—Unsaturated compounds having only one group containing active hydrogen
    • C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C09D4/06—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 C09D159/00 - C09D187/00

Definitions

  • resin coatings are provided over glass fibers prepared by spinning a molten glass for protection and reinforcement.
  • a structure consisting of a primary flexible coating layer formed on the surface of optical fibers and a secondary rigid coating layer applied thereon is known.
  • Tape-shaped optical fibers and optical fiber cables comprising a number of fibers provided with these resin coatings bundled using bundling materials are also well known.
  • Resin compositions for primary coating layers are called primary materials, for secondary coating layers are called secondary materials, and for bundling a number of optical fibers are called bundling materials.
  • a material for further binding several tape-shaped optical fibers and optical fiber cables is also called a bundling material.
  • These resin coatings are usually provided by curing a liquid curable resin composition applied on the surface of the optical fibers by using heat or light, in particular, ultraviolet rays.
  • Such a secondary material and bundling material must have high modulus of elasticity and excellent mechanical characteristics such as high breaking elongation.
  • Optical fibers, tapes, and cables to which the secondary material or bundling material has been applied are wound around a bobbin, which is stored or transported with the secondary materials or the bundling materials being in contact with each other. For this reason, the secondary materials or the bundling materials must have superior surface characteristics to avoid adherence of these materials.
  • an object of the present invention is to provide a coated optical fiber having an outer coating layer, being a cured coating from a liquid curable resin composition capable of producing cured products having excellent mechanical properties and surface characteristics
  • liquid curable resin compositions satisfying the both requirements for excellent mechanical properties and surface characteristics
  • the present inventors have found that a cured material having high modulus of elasticity and breaking elongation, and at the same time, exhibiting superior surface characteristics with a small adhering force can be obtained from a liquid curable resin composition comprising a urethane (meth)acrylate oligomer and a (meth)acrylate compound having an alkyl group containing 4-12 carbons
  • an object of the present invention is to provide a coated optical fiber having an outer coating layer, being a cured coating from a liquid curable resin composition comprising
  • R 1 represents a hydrogen atom or a methyl group and n is an integer from 4 to 12, and (C) a polymerization initiator, wherein the cured products of the liquid curable resin composition have a modulus of elasticity of 50 MPa or more
  • the urethane (meth)acrylate of the component (A) which is a polyme ⁇ zable oligomer can be obtained by reacting a polyol compound, a dusocyanate compound, and a hydroxyl group-containing (meth)acrylate compound, or by reacting a dusocyanate compound and a hydroxyl group- containing (meth)acrylate compound Specifically, the component (A) can be obtamed by reacting the isocyanate group in the dusocyanate compound with the hydroxyl group in the polyol compound and/or hydroxyl group-containing (meth)acrylate compound
  • urethane (meth)acrylate (A-1) In the preparation of urethane (meth)acrylate (A-1) from a polyol compound, dusocyanate compound, and hydroxyl group-containing
  • these compounds are preferably used in such proportions that the isocyanate group of the dusocyanate compound and the hydroxyl group of the hydroxyl group-containing (meth)acrylate are respectively 1 1-2 equivalents and 0 1-1 equivalent for 1 equivalent of the hydroxyl group of the polyether polyol
  • these compounds are preferably used in such a proportion that the isocyanate group of the dusocyanate compound and the hydroxyl group of the hydroxyl group-containing (meth)acrylate are equivalent
  • (meth)acrylate (A-1) and the urethane (meth)acrylate (A-2) at the same time by adjusting the amount of a polyol compound, polyisocyanate compound, and hydroxyl group-containing (meth)acrylate compound
  • These reactions can be carried out, for instance, by a process of reacting the polyol compound, dusocyanate compound, and hydroxyl group- containing (meth)acrylate compound altogether, a process of reacting the polyol compound and dusocyanate compound, and reacting the resulting compound with the hydroxyl group-containing (meth)acrylate compound, a process of reacting the dusocyanate compound and hydroxyl group-containing (meth)acrylate compound, and reacting the resulting product with the polyol compound, and a process of reacting the dusocyanate compound and hydroxyl group-containing (meth)acrylate compound, reacting the resulting product with the polyol compound, and further reacting the hydroxyl group-containing (meth)acrylate compound
  • an aromatic dusocyanate As a dusocyanate compound which is used for the synthesis of urethane (meth)acrylate (A), an aromatic dusocyanate, ahcyclic dusocyanate, aliphatic dusocyanate, and the like can be given Examples of aromatic dusocyanates include 2,4-tolylene dusocyanate, 2,6-tolylene dusocyanate, 1,3-xylylene dusocyanate, 1 ,4-xylylene dusocyanate, 1 ,5-naphthalene dusocyanate, m-phenylene dusocyanate, p-phenylene dusocyanate, 3,3'-d ⁇ methyl-4,4'-d ⁇ phenylmethane dusocyanate, 4,4'- diphenylmethane dusocyanate, 3,3'-d ⁇ methylphenylene dusocyanate, 4,4'-b ⁇ phenylene dusocyanate, b ⁇ s(2-
  • polyether diols such as aliphatic polyether diol, alicyclic polyether diol, and aromatic polyether diol, polyester diol, polycarbonate diol, polycaprolactone diol, and the like can be given These polyols can be used either individually or in combinations of two or more Polyols with a tri or more valence, which are synthesized by reacting a diol compound and a polyisocyanate, can also be used as the above polyols There are no specific limitations to a method of polymerizing the structural unit of these polyols Random polymerization, block polymerization, or graft polymerization can be employed
  • polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol, polyheptamethylene glycol, polydecamethylene glycol, polyether diols obtained by ring-opening copolymerization of two or more of lon-polyme ⁇ zable cyclic compounds, and the like can be given
  • cyclic ethers such as ethylene oxide, propylene oxide, butene-1 -oxide, isobutene oxide, 3,3-b ⁇ schloromethyloxetane, tetrahydrofuran, 2-methyltetrahydrofuran, 3- methyltetrahydrofuran, dioxane, t ⁇ oxane, tetraoxane, cyclohexene oxide, styrene oxide, epichlorohydnn, glycidyl methacrylate, allyl glycidyl ether, allyl glycidyl carbonate, butadiene monoxide, isoprene monoxide, vinyl oxetane, vinyl tetrahydrofuran, vinyl cyclohexene oxide, phenyl glycidyl ether, butyl glycidyl ether, and
  • polyether diols obtained by ring-opening copolymenzation of the above lon-polymenzable cyclic compounds and cyclic imines such as ethyleneimine, cyclic lactones such as ⁇ -propyolactone and lactideglycolic acid, or dimethylcyclopolysiloxanes can also be used as the above polyether diols
  • Examples of commercially available products of the aliphatic polyether diols include PTMG650, PTMG1000, PTMG2000 (manufactured by Mitsubishi Chemical Corp ), PPG400, PPG1000, EXCENOL720, 1020, 2020 (manufactured by Asahi Ohne Co , Ltd ), PEG1000, UNISAFE DC1100, DC1800 (manufactured by Nippon Oil and Fats Co , Ltd ), PPTG2000, PPTG1000, PTG400, PTGL2000 (manufactured by Hodogaya Chemical Co , Ltd
  • aromatic polyether diols examples include alkylene oxide addition diol of bisphenol A, alkylene oxide addition diol of bisphenol F, alkylene oxide addition diol of hydroqumone, alkylene oxide addition diol of naphthohydroquinone, alkylene oxide addition diol of anthrahydroquinone, and the like
  • Commercially available products such as Un ⁇ olDA400, DA700, DA1000, and DA4000 (manufactured by Nippon Oil and Fats Co , Ltd ) can be used as the aromatic polyether diols
  • polyester diols include polyester diols obtained by reacting a polyhyd ⁇ c alcohol and a polybasic acid and the like
  • polyhydnc alcohol examples include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, tetramethylene glycol, polytetramethylene glycol, 1 ,6- hexanediol, neopentyl glycol, 1 ,4-cyclohexaned ⁇ methanol, 3-methyl-1 ,5- pentanediol, 1 ,9-nonaned ⁇ ol, 2-methyl-1 ,8-octaned ⁇ ol, and the like
  • polybasic acid examples include phtha c acid, isophthalic acid, terephthahc acid, maleic acid, fumaric acid, adipic acid, sebasic acid, and the like
  • Kurapol P-2010, P-1010, L-2010, L-1010, A-2010, A-1010, F- 2020, F-1010, PMIPA-2000, PKA-A, PNOA-2010, PNOA-1010 manufactured by Kuraray Co , Ltd , and the like can be given
  • polycarbonate diols polycarbonate of polytetrahydrofuran, polycarbonate of 1 ,6-hexaned ⁇ ol, and the like, and commercially available products such as DN-980, 981 , 982, 983 (manufactured by Nippon Polyurethane Industry Co , Ltd ), PC-8000 (manufactured by PPG), and PC-THF-CD (manufactured by BASF)
  • polycaprolactone diols polycaprolactone diols obtained by reacting D-caprolactone and a diol, and the like can be given Examples of such diols used for the reaction with ⁇ -caprolactone include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, tetramethylene glycol, polytetramethylene glycol, 1 ,2-polybutylene glycol, 1 ,6-hexaned ⁇ ol,
  • polyols other than the above-mentioned polyols include ethylene glycol, propylene glycol, 1,4-butaned ⁇ ol, 1 ,5-pentane diol, 1 ,6- hexanediol, neopentyl glycol, 1 ,4-cyclohexaned ⁇ methanol, hydrogenated bisphenol A, hydrogenated bisphenol F, dimethylol compound of dicyclopentadiene, t ⁇ cyclodecanedimethanol, pentacyclodecanedimethanol, G- methyl-Q-valerolactone, polybutadiene with a terminal hydroxyl group, hydrogenated polybutadiene with a terminal hydroxyl group, castor oil-modified polyol, polydimethylsiloxane compounds with terminal diols, polydimethylsiloxane carbitol-modified polyol, and the like
  • a diamine together with a polyether polyol in the synthesis of the urethane (meth)acrylate (A)
  • examples of such a diamine include ethylenediamine, tetramethylenediamine, hexamethylenediamine, p- phenylenediamine, 4,4'-d ⁇ am ⁇ nod ⁇ phenylmethane, diamines containing a heteroatom, polyether diamines, and the like
  • Part of the (meth)acrylates containing a hydroxyl group can be replaced by the compounds having a functional group which can be added to an isocyanate group
  • a functional group which can be added to an isocyanate group For example, ⁇ -aminopropylt ⁇ ethoxysilane, ⁇ -mercaptopropylt ⁇ methoxy-silane, and the like can be used Use of these compounds improves adhesion to substrates such as glass
  • urethanization catalyst such as copper naphthenate, cobalt naphthenate, zinc naphthenate, dibutyltin dilaurate, t ⁇ ethylamine, 1 ,4-d ⁇ azab ⁇ cyclo[2 2 2]octane, or 2,6,7-tr ⁇ methyl-1,4-d ⁇ azab ⁇ cyclo[2 2.2]octane, in the amount from 0.01 to 1 wt% of the total amount of reactants.
  • urethanization catalyst such as copper naphthenate, cobalt naphthenate, zinc naphthenate, dibutyltin dilaurate, t ⁇ ethylamine, 1 ,4-d ⁇ azab ⁇ cyclo[2 2 2]octane, or 2,6,7-tr ⁇ methyl-1,4-d ⁇ azab ⁇ cyclo[2 2.2]octane
  • the urethane (meth)acrylate (A) used in the present invention has a polystyrene-reduced molecular weight measured by the gel permeation chromatography in the range of 500-20,000, and preferably 700-15,000. If the molecular weight is less than 500, the cured products may have only a small breaking elongation; if more than 20,000, on the other hand, the resin composition may have unduly high viscosity
  • the amount of the urethane (meth)acrylate (A) in the liquid curable resin composition of the present invention is preferably 30-90 wt%, more preferably 55-87 wt%, and particularly preferably 65-85 wt% If less than 30 wt%, the modulus of elasticity largely depends upon temperatures, if more than 90 wt%, the liquid curable resin composition may have unduly high viscosity Given as examples of the component (B) in the liquid curable resin composition of the present invention, which is the (meth)acrylate compound shown by
  • the proportion of the (meth)acrylate compound (B) in the liquid curable resin composition of the present invention is preferably 1-60 wt%, and more preferably 3-30 wt% If less than 1 wt%, the effect of improvement in the mechanical properties and surface characteristics is insufficient, if more than 60 wt%, volatility of the resin composition is unacceptably high
  • the polymerization initiators (C) in the liquid curable resin composition of the present invention either a heat polymerization initiator or a photopolyme ⁇ zation initiator can be used; photopolyme ⁇ sation is strongly preferred because of cure speed.
  • a heat polymerization initiator such as a peroxide or azo compound can usually be used.
  • a peroxide or azo compound can usually be used.
  • Specific examples include benzoyl peroxide, t-butyloxy benzoate, azobisisobutyronitrile, and the like.
  • a photopolymerization initiator is used.
  • a photosensitizer can also be added.
  • the photopolymerization initiator are 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2- phenylacetophenone, xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, thphenylamine, carbazole, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4,4'-diamino- benzophenone, Michler's ketone, benzoin propyl ether, benzoin ethyl ether, benzyl methyl ketal, 1-(4-isopropylphenyI)-2-hydroxy-2- methylpropan-1-one, 2-hydroxy-2-methyl-1-pheny
  • photosensitizers include triethylamine, diethylamine, N-methyldiethanoleamine, ethanolamine, 4-dimethylaminobenzoic acid, 4-methyl dimethylaminobenzoate, 4-ethyl dimethylaminobenzoate, 4-isoamyi dimethylaminobenzoate; Ubecryl P102, 103, 104, 105 (manufactured by UCB); and the like.
  • the proportion of the polymerization initiator (C) used in the liquid curable composition of the present invention is preferably 0.1-10 wt%, and more preferably 0.3-7 wt%.
  • a polymerizable unsaturated monomer (D) other than the (meth)acrylate compound (B) may be added to increase curability and adjust the viscosity of the liquid curable resin composition of the present invention in the amount of 0-60 wt%, and preferably 3- 40 wt%. If more than 60 wt% of the component (D) is added, temperature dependency of the modulus of elasticity of the cured products may increase.
  • Mono-functional compounds and poly-functional compounds are given as examples of the polymerizable unsaturated monomer (D).
  • vinyl group-containing lactam such as N-vmylpyrrolidone and N-vinylcaprolactam
  • alicyclic structure-containing (meth)acrylates such as isobornyl (meth)acrylate, bornyl (meth)acrylate, t cyclodecanyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, and cyclohexyl (meth)acrylate, benzyl (meth)acrylate, 4- butylcyclohexyl (meth)acrylate, acryloylmorpholine, vinyhmidazole, vinylpy ⁇ dine, and the like
  • 2-hydroxyethyl (meth)ac ⁇ ylate 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl acrylate, stearyl (meth)acrylate, iso-stearyl (meth)acrylate
  • ARONIX M-1 1 1 , M-1 13, M-1 14, M-1 17 manufactured by Toagosei Co , Ltd
  • KAYARAD TC1 10S, R629, R644 manufactured by Nippon Kayaku Co , Ltd
  • IBXA, V ⁇ scoat3700 manufactured by Osaka Organic Chemical Industry, Ltd
  • polyfunctional compounds include trimethylolpropane tr ⁇ (meth)acrylate, pentaeryth ⁇ tol t ⁇ (meth)acrylate, ethylene glycol d ⁇ (meth)acrylate, tetraethylene glycol d ⁇ (meth)acrylate, polyethylene glycol d ⁇ (meth)acrylate, 1 ,4-butaned ⁇ ol d ⁇ (meth)acrylate, 1 ,6-hexaned ⁇ ol
  • antioxidants such as antioxidants, coloring agents, UV absorbers, light stabilizers, silane coupling agents, heat polymerization inhibitors, leveling agents, surfactants, preservatives, plasticizers, lubricants, solvents, fillers, aging preventives, wettability improvers, and coating surface improvers can also be added in addition to the above components, as required.
  • antioxidants Irganox 1010, 1035, 1076, 1222 (manufactured by Ciba Specialty Chemicals Co., Ltd.), Antigene P, 3C, FR, GA-80, (manufactured by Sumitomo Chemical Industries Co., Ltd.), and the like can be given.
  • UV absorbers Tinuvin P, 234, 320, 326, 327, 328, 329, 213 (manufactured by Ciba Specialty Chemicals Co., Ltd.), Seesorb 102, 103, 110, 501 , 202, 712, 704
  • Tinuvin 292, 144, 622LD manufactured by Ciba Specialty Chemicals Co., Ltd.
  • Sanol LS770 manufactured by Sankyo Co., Ltd.
  • TM-061 manufactured by Sumitomo Chemical Co., Ltd.
  • silane coupling agents ⁇ -aminopropyltriethoxysilane, ⁇ - mercaptopropyltrimethoxy-silane, ⁇ -methacryloxypropyltrimethoxysilane, and the like, and commercially available products such as SH6062, 6030 (manufactured by Dow Corning Toray Silicone Co., Ltd.), and KBE903, 603, 403 (manufactured by Shin-Etsu Chemical Co., Ltd.) can be given.
  • other oligomers and polymers, as well as other additives can optionally be added to the liquid curable resin composition of the present invention inasmuch as characteristics of the composition of the present invention are not impaired.
  • oligomers and polymers examples include polyester (meth)acrylate, epoxy (meth)acrylate, polyamide (meth)acrylate, siloxane polymers having a (meth)acryloyloxy group, glycidyl methacrylate, and the like.
  • the composition of the present invention is cured by heat or radiation.
  • Radiation used herein includes infrared rays, visible rays, ultraviolet rays, X-rays, electron beams, ⁇ -rays, ⁇ -rays, ⁇ -rays, and the like. Particularly preferred radiation is ultraviolet rays.
  • the viscosity of the liquid curable resin composition of the present invention is in the range of 0.1-10 Pa s, preferably 1-8 Pa s, and particular preferably 2-6 Pa s. Cured materials made from the resin composition of the present invention have high modulus of elasticity and breaking elongation, and at the same time, exhibit superior surface characteristics with a small adhering force.
  • the resin composition is useful as a secondary material or bundling material for optical fibers.
  • the cured material must have modulus of elasticity of at least 50 MPa, preferably more than 200 MPa, and particularly preferably more than 400 MPa. If the modulus of elasticity is less than 50 MPa, an attenuation loss of the optical fiber may be too large to serve the product to the above-mentioned application.
  • the cured product preferably has breaking elongation of 20% or more, preferably 25% or more, and more preferably 30% or more. If the breaking elongation is less than 20%, optical fibers may be more easily broken.
  • the cured products preferably have a water absorption rate of 3% or less, preferably 2.7% or less, and more preferably 2.4% or less. If the water absorption rate is more than 3%, the transmission loss may increase when the optical fiber is dipped in warm water.
  • a film adhering force is a particularly important characteristic because optical fibers are stored or transported under the conditions in which secondary materials or bundling materials are in contact with each other. For this reason, film adhering force preferably is 0.09 N/cm or less, preferably 0.08 N/cm or less, and more preferably 0.07 N/cm or less.
  • the modulus of elasticity and breaking elongation were measured according to JIS K7127 using the test specimens thus obtained. The measurement was carried out at a bench mark distance of 25 mm, a temperature of 23°C, and a humidity of 50%RH. Drawing rates of 1 mm/min and 50 mm/min were adopted respectively for measurement of modulus of elasticity and breaking elongation.
  • the adhered films were conditioned at 23°C and 50% RH for 24 hours, and cut into strips with a width of 1 cm to obtain test specimens for measuring adhering force.
  • the adhered films were held with upper and lower chucks of a tensile machine and peeled at a tensile rate of 50 mm/min. to measure the force required for the films to be peeled.
  • the measurement was carried out at a temperature of 23°C and a relative humidity of 50%. The smaller the adhesion force, the better the surface characteristics.
  • the water absorption rate of the cured materials made from the compositions obtained in Examples and Comparative Examples was measured.
  • the liquid compositions were applied to a glass plate using an applicator with a thickness of 381 ⁇ m, irradiated by ultraviolet rays by using a 3.5 kW metal halide lamp ("SMX-3500/F-OS", manufactured by ORC Co., Ltd.) at a dose of 1.0 J/cm 2 in air to form cured coatings having a thickness of about 200 ⁇ m.
  • the cured film was cut into pieces having a weight of about 1 g each and dried at 50°C under reduced pressure for 24 hours, before measuring the weight (W1).

Abstract

A coated optical fiber having an outer coating layer, being a cured coating from a liquid curable resin composition comprising: (A) a urethane (meth)acrylate obtained by the reaction of a polyol compound, a diisocyanate compound, and a hydroxyl group-containing (meth)acrylate compound, or a urethane (meth)acrylate obtained by the reaction of a diisocyanate compound and a hydroxyl group-containing (meth)acrylate compound, (B) a (meth)acrylate compound shown by the following formula (1), CH2=C(R1)-COO-C¿n?H2n+1 wherein R?1¿ represents a hydrogen atom or a methyl group and n is an integer from 4 to 12, and (C) a polymerization initiator, wherein the cured products of the liquid curable resin composition has a modulus of elasticity of 50 Mpa or more.

Description

OPTICAI FIBER COATING COMPOSITIONS
Field of the Invention
The present invention relates to a liquid curable resin composition capable of producing a cured material having excellent mechanical properties and surface characteristics suitable as an outer coating layer such as a secondary material and bundling material for optical fibers.
Description of related art
In the manufacture of optical fibers, resin coatings are provided over glass fibers prepared by spinning a molten glass for protection and reinforcement. As such a resin coating, a structure consisting of a primary flexible coating layer formed on the surface of optical fibers and a secondary rigid coating layer applied thereon is known. Tape-shaped optical fibers and optical fiber cables comprising a number of fibers provided with these resin coatings bundled using bundling materials are also well known. Resin compositions for primary coating layers are called primary materials, for secondary coating layers are called secondary materials, and for bundling a number of optical fibers are called bundling materials. In addition, a material for further binding several tape-shaped optical fibers and optical fiber cables is also called a bundling material. These resin coatings are usually provided by curing a liquid curable resin composition applied on the surface of the optical fibers by using heat or light, in particular, ultraviolet rays.
Such a secondary material and bundling material must have high modulus of elasticity and excellent mechanical characteristics such as high breaking elongation. Optical fibers, tapes, and cables to which the secondary material or bundling material has been applied are wound around a bobbin, which is stored or transported with the secondary materials or the bundling materials being in contact with each other. For this reason, the secondary materials or the bundling materials must have superior surface characteristics to avoid adherence of these materials.
Accordingly, an object of the present invention is to provide a coated optical fiber having an outer coating layer, being a cured coating from a liquid curable resin composition capable of producing cured products having excellent mechanical properties and surface characteristics
Summary of the invention
As a result of extensive studies on liquid curable resin compositions satisfying the both requirements for excellent mechanical properties and surface characteristics, the present inventors have found that a cured material having high modulus of elasticity and breaking elongation, and at the same time, exhibiting superior surface characteristics with a small adhering force can be obtained from a liquid curable resin composition comprising a urethane (meth)acrylate oligomer and a (meth)acrylate compound having an alkyl group containing 4-12 carbons
Detailed descnption of the invention
Accordingly, an object of the present invention is to provide a coated optical fiber having an outer coating layer, being a cured coating from a liquid curable resin composition comprising
(A) a urethane (meth)acrylate obtained by the reaction of a polyol compound, a dusocyanate compound, and a hydroxyl group-containing (meth)acrylate compound, or a urethane (meth)acrylate obtained by the reaction of a dusocyanate compound and a hydroxyl group-containing (meth)acrylate compound,
(B) a (met )acrylate compound shown by the following formula (1),
CH2=C(R )-COO-CnH 2n+ 1 (1 )
wherein R1 represents a hydrogen atom or a methyl group and n is an integer from 4 to 12, and (C) a polymerization initiator, wherein the cured products of the liquid curable resin composition have a modulus of elasticity of 50 MPa or more
The urethane (meth)acrylate of the component (A) which is a polymeπzable oligomer can be obtained by reacting a polyol compound, a dusocyanate compound, and a hydroxyl group-containing (meth)acrylate compound, or by reacting a dusocyanate compound and a hydroxyl group- containing (meth)acrylate compound Specifically, the component (A) can be obtamed by reacting the isocyanate group in the dusocyanate compound with the hydroxyl group in the polyol compound and/or hydroxyl group-containing (meth)acrylate compound
In the preparation of urethane (meth)acrylate (A-1) from a polyol compound, dusocyanate compound, and hydroxyl group-containing
(meth)acrylate, these compounds are preferably used in such proportions that the isocyanate group of the dusocyanate compound and the hydroxyl group of the hydroxyl group-containing (meth)acrylate are respectively 1 1-2 equivalents and 0 1-1 equivalent for 1 equivalent of the hydroxyl group of the polyether polyol In the preparation of urethane (meth)acrylate (A- 2) from a dusocyanate compound and hydroxyl group-containing (meth)acrylate, these compounds are preferably used in such a proportion that the isocyanate group of the dusocyanate compound and the hydroxyl group of the hydroxyl group-containing (meth)acrylate are equivalent In addition, it is possible to prepare both the urethane
(meth)acrylate (A-1) and the urethane (meth)acrylate (A-2) at the same time by adjusting the amount of a polyol compound, polyisocyanate compound, and hydroxyl group-containing (meth)acrylate compound
These reactions can be carried out, for instance, by a process of reacting the polyol compound, dusocyanate compound, and hydroxyl group- containing (meth)acrylate compound altogether, a process of reacting the polyol compound and dusocyanate compound, and reacting the resulting compound with the hydroxyl group-containing (meth)acrylate compound, a process of reacting the dusocyanate compound and hydroxyl group-containing (meth)acrylate compound, and reacting the resulting product with the polyol compound, and a process of reacting the dusocyanate compound and hydroxyl group-containing (meth)acrylate compound, reacting the resulting product with the polyol compound, and further reacting the hydroxyl group-containing (meth)acrylate compound
As a dusocyanate compound which is used for the synthesis of urethane (meth)acrylate (A), an aromatic dusocyanate, ahcyclic dusocyanate, aliphatic dusocyanate, and the like can be given Examples of aromatic dusocyanates include 2,4-tolylene dusocyanate, 2,6-tolylene dusocyanate, 1,3-xylylene dusocyanate, 1 ,4-xylylene dusocyanate, 1 ,5-naphthalene dusocyanate, m-phenylene dusocyanate, p-phenylene dusocyanate, 3,3'-dιmethyl-4,4'-dιphenylmethane dusocyanate, 4,4'- diphenylmethane dusocyanate, 3,3'-dιmethylphenylene dusocyanate, 4,4'-bιphenylene dusocyanate, bιs(2- ιsocyanateethyl)fumarate, 6-ιsopropyl-1 ,3-phenyl dusocyanate, 4-dιphenylpropane dusocyanate, tetramethylxylylene dusocyanate, and the like Examples of alicyclic dnsocyanates include isophorone dusocyanate, methylenebιs(4- cyclohexylisocyanate), hydrogenated diphenylmethane dusocyanate, hydrogenated xylylene dusocyanate, 2 5-bιs(ιsocyanatemethyl)- bιcyclo[2 2 1]heptane, 2,6-bιs(ιsocyanatemethyl)-bιcyclo[2 2 1]heptane, and the like As examples of aliphatic dnsocyanates, 1 ,6-hexane dusocyanate, 2,2,4- tπmethylhexamethylene dusocyanate, lysme dusocyanate, and the like can be given Of these, 2,4-tolylene dusocyanate and isophorone dusocyanate are particularly preferred Aliphatic isocyanates such as IPDI are most preferred These dnsocyanates can be used either individually or in combinations of two or more
As hydroxyl group-containing (meth)acrylate compounds used in the synthesis of the urethane (meth)acrylate (A), a hydroxyl group-containing (meth)acrylate containing a hydroxyl group bonded to a primary carbon atom (hereinafter designated as "(meth)acrylate containing a primary hydroxyl group") and a hydroxyl group-containing (meth)acrylate containing a hydroxyl group bonded to a secondary carbon atom (hereinafter designated as "(meth)acrylate containing a secondary hydroxyl group") are preferable A hydroxyl group- containing (meth)acrylate containing a hydroxyl group bonded to a tertiary carbon atom (hereinafter designated as "(meth)acrylate containing a tertiary hydroxyl group") is not preferred because of its inferior reactivity with an isocyanate group Examples of the above (meth)acrylate containing a primary hydroxyl group include 2-hydroxyethyl (meth)acrylate 4-hydroxybutyl (meth)acrylate, 1 ,6-hexanedιol mono(meth)acrylate, pentaerythπtol trι(meth)acrylate, dipentaerythπtol penta(meth)acrylate, neopentyl glycol mono(meth)acrylate, tπmethylolpropane dι(meth)acrylate, trimethylolethane dι(meth)acrylate and (meth)acrylate of the following formula (2)
CH2=C(R2)-COOCH2CH2-(OCOCH2CH2CH2CH2CH2)m-OH (2)
wherein R2 represents a hydrogen atom or a methyl group and m is an integer from 1 to 3 Examples of the above (meth)acrylate containing a secondary hydroxyl group include 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 2-hydroxy-;.-phenyloxypropyl (meth)acrylate, 4-hydroxycyclohexyl (meth)acrylate, compound?, obtained by the addition reaction of (meth)acrylιc acid and glycidyl group-containing compounds such as alkyl glycidyl ether, allyl glycidyl ether, or glycidyl (meth)acrylate, and the like As examples of polyols used for the preparation of the urethane
(meth)acrylate (A), polyether diols such as aliphatic polyether diol, alicyclic polyether diol, and aromatic polyether diol, polyester diol, polycarbonate diol, polycaprolactone diol, and the like can be given These polyols can be used either individually or in combinations of two or more Polyols with a tri or more valence, which are synthesized by reacting a diol compound and a polyisocyanate, can also be used as the above polyols There are no specific limitations to a method of polymerizing the structural unit of these polyols Random polymerization, block polymerization, or graft polymerization can be employed
As examples of the aliphatic polyether diols, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol, polyheptamethylene glycol, polydecamethylene glycol, polyether diols obtained by ring-opening copolymerization of two or more of lon-polymeπzable cyclic compounds, and the like can be given
As examples of the lon-polymenzable cyclic compounds, cyclic ethers such as ethylene oxide, propylene oxide, butene-1 -oxide, isobutene oxide, 3,3-bιschloromethyloxetane, tetrahydrofuran, 2-methyltetrahydrofuran, 3- methyltetrahydrofuran, dioxane, tπoxane, tetraoxane, cyclohexene oxide, styrene oxide, epichlorohydnn, glycidyl methacrylate, allyl glycidyl ether, allyl glycidyl carbonate, butadiene monoxide, isoprene monoxide, vinyl oxetane, vinyl tetrahydrofuran, vinyl cyclohexene oxide, phenyl glycidyl ether, butyl glycidyl ether, and glycidyl benzoate can be given
As examples of the polyether diols obtained by ring-opening copolymerization of two or more of lon-polymenzable cyclic compounds, binary polymers obtained by the ring-opening polymerization of the combinations of monomers such as tetrahydrofuran and propylene oxide, tetrahydrofuran and 2- methyltetrahydrofuran, tetrahydrofuran and 3-methyl tetrahydrofuran, tetrahydrofuran and ethylene oxide, propylene oxide and ethylene oxide, and butene-1 -oxide and ethylene oxide, terpolymers obtained by the polymerization of the combinations of monomers such as tetrahydrofuran, butene-1 -oxide, and ethylene oxide, and the like can be given
Moreover, polyether diols obtained by ring-opening copolymenzation of the above lon-polymenzable cyclic compounds and cyclic imines such as ethyleneimine, cyclic lactones such as β-propyolactone and lactideglycolic acid, or dimethylcyclopolysiloxanes can also be used as the above polyether diols Examples of commercially available products of the aliphatic polyether diols include PTMG650, PTMG1000, PTMG2000 (manufactured by Mitsubishi Chemical Corp ), PPG400, PPG1000, EXCENOL720, 1020, 2020 (manufactured by Asahi Ohne Co , Ltd ), PEG1000, UNISAFE DC1100, DC1800 (manufactured by Nippon Oil and Fats Co , Ltd ), PPTG2000, PPTG1000, PTG400, PTGL2000 (manufactured by Hodogaya Chemical Co , Ltd ), Z-3001-4, Z-3001 -5, PBG2000A, PBG2000B, EO/BO4000, EO/BO2000 (manufactured by Dai-ichi Kogyo Seiyaku Co , Ltd ), and the like
As examples of alicyclic polyether diols, alkylene oxide addition diol of hydrogenated bisphenol A, alkylene oxide addition diol of hydrogenated bisphenol F, alkylene oxide addition diol of 1 4-cyclohexane diol, and the like can be given
Examples of aromatic polyether diols include alkylene oxide addition diol of bisphenol A, alkylene oxide addition diol of bisphenol F, alkylene oxide addition diol of hydroqumone, alkylene oxide addition diol of naphthohydroquinone, alkylene oxide addition diol of anthrahydroquinone, and the like Commercially available products such as UnιolDA400, DA700, DA1000, and DA4000 (manufactured by Nippon Oil and Fats Co , Ltd ) can be used as the aromatic polyether diols
Examples of polyester diols include polyester diols obtained by reacting a polyhydπc alcohol and a polybasic acid and the like Examples of the polyhydnc alcohol include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, tetramethylene glycol, polytetramethylene glycol, 1 ,6- hexanediol, neopentyl glycol, 1 ,4-cyclohexanedιmethanol, 3-methyl-1 ,5- pentanediol, 1 ,9-nonanedιol, 2-methyl-1 ,8-octanedιol, and the like As examples of the polybasic acid, phtha c acid, isophthalic acid, terephthahc acid, maleic acid, fumaric acid, adipic acid, sebasic acid, and the like can be given
As examples of commercially available products of the above polyester diols, Kurapol P-2010, P-1010, L-2010, L-1010, A-2010, A-1010, F- 2020, F-1010, PMIPA-2000, PKA-A, PNOA-2010, PNOA-1010 (manufactured by Kuraray Co , Ltd ), and the like can be given
As examples of the polycarbonate diols, polycarbonate of polytetrahydrofuran, polycarbonate of 1 ,6-hexanedιol, and the like, and commercially available products such as DN-980, 981 , 982, 983 (manufactured by Nippon Polyurethane Industry Co , Ltd ), PC-8000 (manufactured by PPG), and PC-THF-CD (manufactured by BASF) can be given As examples of polycaprolactone diols, polycaprolactone diols obtained by reacting D-caprolactone and a diol, and the like can be given Examples of such diols used for the reaction with ε-caprolactone include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, tetramethylene glycol, polytetramethylene glycol, 1 ,2-polybutylene glycol, 1 ,6-hexanedιol, neopentyl glycol, 1 ,4- cyclohexanedimethanol, 1 ,4-butanedιol, and the like These polycaprolactone diols are commercially available under the trademarks of PLACCEL205, 205AL, 212, 212AL, 220, 220AL (manufactured by Daicel Chemical Industries, Ltd ), and
Examples of polyols other than the above-mentioned polyols include ethylene glycol, propylene glycol, 1,4-butanedιol, 1 ,5-pentane diol, 1 ,6- hexanediol, neopentyl glycol, 1 ,4-cyclohexanedιmethanol, hydrogenated bisphenol A, hydrogenated bisphenol F, dimethylol compound of dicyclopentadiene, tπcyclodecanedimethanol, pentacyclodecanedimethanol, G- methyl-Q-valerolactone, polybutadiene with a terminal hydroxyl group, hydrogenated polybutadiene with a terminal hydroxyl group, castor oil-modified polyol, polydimethylsiloxane compounds with terminal diols, polydimethylsiloxane carbitol-modified polyol, and the like
It is possible to use a diamine together with a polyether polyol in the synthesis of the urethane (meth)acrylate (A) Examples of such a diamine include ethylenediamine, tetramethylenediamine, hexamethylenediamine, p- phenylenediamine, 4,4'-dιamιnodιphenylmethane, diamines containing a heteroatom, polyether diamines, and the like
Part of the (meth)acrylates containing a hydroxyl group can be replaced by the compounds having a functional group which can be added to an isocyanate group For example, γ-aminopropyltπethoxysilane, γ-mercaptopropyltπmethoxy-silane, and the like can be used Use of these compounds improves adhesion to substrates such as glass
In the synthesis of the urethane (meth)acrylate (A), it is desirable to use a urethanization catalyst, such as copper naphthenate, cobalt naphthenate, zinc naphthenate, dibutyltin dilaurate, tπethylamine, 1 ,4-dιazabιcyclo[2 2 2]octane, or 2,6,7-trιmethyl-1,4-dιazabιcyclo[2 2.2]octane, in the amount from 0.01 to 1 wt% of the total amount of reactants. In addition, such reactions are earned out usually at 5-90°C, and preferably at 10-80°C
The urethane (meth)acrylate (A) used in the present invention has a polystyrene-reduced molecular weight measured by the gel permeation chromatography in the range of 500-20,000, and preferably 700-15,000. If the molecular weight is less than 500, the cured products may have only a small breaking elongation; if more than 20,000, on the other hand, the resin composition may have unduly high viscosity The amount of the urethane (meth)acrylate (A) in the liquid curable resin composition of the present invention is preferably 30-90 wt%, more preferably 55-87 wt%, and particularly preferably 65-85 wt% If less than 30 wt%, the modulus of elasticity largely depends upon temperatures, if more than 90 wt%, the liquid curable resin composition may have unduly high viscosity Given as examples of the component (B) in the liquid curable resin composition of the present invention, which is the (meth)acrylate compound shown by the formula (1), are butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, amyl (meth)acrylate, isoamyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, iso-octyl (meth)acrylate, nonyl (meth)acrylate, iso- nonyl (meth)acrylate, decyl (meth)acrylate, iso-decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, and lauryl (meth)acrylate Of these (meth)acrylate compounds, the compounds having an integer 8, 9 or 10 for n in the formula (1) are preferred in view of processability Most preferred are n=8 or 9 A particularly preferred (meth)acrylate compound in view of low viscosity is 2- ethylhexyl acrylate having an integer 8 for n in the formula (1), and isodecylacrylate, having an integer 10 for n, another preferred compound is octyl decylacrylate
The proportion of the (meth)acrylate compound (B) in the liquid curable resin composition of the present invention is preferably 1-60 wt%, and more preferably 3-30 wt% If less than 1 wt%, the effect of improvement in the mechanical properties and surface characteristics is insufficient, if more than 60 wt%, volatility of the resin composition is unacceptably high
As the polymerization initiators (C) in the liquid curable resin composition of the present invention, either a heat polymerization initiator or a photopolymeπzation initiator can be used; photopolymeπsation is strongly preferred because of cure speed.
If the liqiϊd curable resin composition of the present invention is cured by heat, a heat polymerization initiator such as a peroxide or azo compound can usually be used. Specific examples include benzoyl peroxide, t-butyloxy benzoate, azobisisobutyronitrile, and the like.
If the liquid curable resin composition of the present invention is cured by irradiation of lights, a photopolymerization initiator is used. Optionally, a photosensitizer can also be added. Given as examples of the photopolymerization initiator are 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2- phenylacetophenone, xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, thphenylamine, carbazole, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4,4'-diamino- benzophenone, Michler's ketone, benzoin propyl ether, benzoin ethyl ether, benzyl methyl ketal, 1-(4-isopropylphenyI)-2-hydroxy-2- methylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, thioxanethone, diethylthioxanthone, 2- isopropylthioxanthone, 2-chlorothioxanthone, 2-methyl-1-[4-(methylthio)phenyl]- 2-morpholino-propan-1-one, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide; IRGACURE 184, 369, 651 , 500, 907, CGI 1700, CGI 1750, CGI 1850, CG24-61 , Darocur 1116, 1173 (manufactured by Ciba Specialty Chemicals Co.); Lucirin LR8728
(manufactured by BASF); and Ubecryl P36 (manufactured by UCB). Examples of photosensitizers include triethylamine, diethylamine, N-methyldiethanoleamine, ethanolamine, 4-dimethylaminobenzoic acid, 4-methyl dimethylaminobenzoate, 4-ethyl dimethylaminobenzoate, 4-isoamyi dimethylaminobenzoate; Ubecryl P102, 103, 104, 105 (manufactured by UCB); and the like.
The proportion of the polymerization initiator (C) used in the liquid curable composition of the present invention is preferably 0.1-10 wt%, and more preferably 0.3-7 wt%.
In addition to the above components, a polymerizable unsaturated monomer (D) other than the (meth)acrylate compound (B) may be added to increase curability and adjust the viscosity of the liquid curable resin composition of the present invention in the amount of 0-60 wt%, and preferably 3- 40 wt%. If more than 60 wt% of the component (D) is added, temperature dependency of the modulus of elasticity of the cured products may increase. Mono-functional compounds and poly-functional compounds are given as examples of the polymerizable unsaturated monomer (D). Given as examples of monofunctional compounds are vinyl group-containing lactam such as N-vmylpyrrolidone and N-vinylcaprolactam, alicyclic structure-containing (meth)acrylates such as isobornyl (meth)acrylate, bornyl (meth)acrylate, t cyclodecanyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, and cyclohexyl (meth)acrylate, benzyl (meth)acrylate, 4- butylcyclohexyl (meth)acrylate, acryloylmorpholine, vinyhmidazole, vinylpyπdine, and the like In addition to the above compounds, 2-hydroxyethyl (meth)acιylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl acrylate, stearyl (meth)acrylate, iso-stearyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, methoxyethylene glycol (meth)acrylate, ethoxyethyl (meth)acrylate, methoxypolyethylene glycol (meth) acrylate, methoxy polypropylene glycol (meth)acrylate, diacetone (meth)acrylamιde, isobutoxymethyl (meth)acrylamιde, N,N-dιmethyl (meth)acrylamιde, t-octyl (meth)acrylamιde, dimethylaminoethyl (meth)acrylate, diethylammoethyl (meth)acrylate, 7-amιno-3,7-dιmethyloctyl (meth)acrylate, N,N- diethyl (meth)acrylamιde, N,N-dιmethylamιno propyl (meth)acrylamιde, hydroxybutyl vinyl ether, lauryl vinyl ether, cetyl vinyl ether, 2-ethylhexyl vinyl ether, and the like can be given
As examples of commercially available products of the monofunctional compound used as the polymerizable unsaturated monomer, ARONIX M-1 1 1 , M-1 13, M-1 14, M-1 17 (manufactured by Toagosei Co , Ltd ), KAYARAD TC1 10S, R629, R644 (manufactured by Nippon Kayaku Co , Ltd ), IBXA, Vιscoat3700 (manufactured by Osaka Organic Chemical Industry, Ltd ), and the like can be given Examples of polyfunctional compounds include trimethylolpropane trι(meth)acrylate, pentaerythπtol tπ(meth)acrylate, ethylene glycol dι(meth)acrylate, tetraethylene glycol dι(meth)acrylate, polyethylene glycol dι(meth)acrylate, 1 ,4-butanedιol dι(meth)acrylate, 1 ,6-hexanedιol dι(meth)acrylate, neopentyl glycol dι(meth)acrylate, tnmethylolpropanetrioxyethyl (meth)acrylate, tπs(2-hydroxyethyl)ιsocyanurate tπ(meth)acrylate, trιs(2-hydroxyethyl)ιsocyanurate dι(meth)acrylate, tπcyclodecanedimethanol di (meth) acrylate, dι(meth)acrylate of diol of ethylene oxide or propylene oxide adduct of bisphenol A, dι(meth)acrylate of diol of ethylene oxide or propylene oxide adduct of hydrogenated bisphenol A, epoxy(meth)acrylate obtained by the addition of (meth)acrylate to diglycidyl ether of bisphenol A, tπethylene glycol divinyl ether, and the like Examples of commercially available products of the above polyfunctional compounds include Yupimer UV SA1002, SA2007 (manufactured by Mitsubishi Chemical Corp.), Viscoat 700 (manufactured by Osaka Organic Chemical Industry, Ltd.), KAYARAD R-604, DPCA-20, DPCA-30, DPCA-60, DPCA-120, HX-620, D-310, D-330 (manufactured by Nippon Kayaku Co., Ltd.), ARONIX M-210, M-215, M-315, M- 325 (manufactured by Toagosei Co., Ltd.), and the like.
Various additives such as antioxidants, coloring agents, UV absorbers, light stabilizers, silane coupling agents, heat polymerization inhibitors, leveling agents, surfactants, preservatives, plasticizers, lubricants, solvents, fillers, aging preventives, wettability improvers, and coating surface improvers can also be added in addition to the above components, as required. As examples of the antioxidants, Irganox 1010, 1035, 1076, 1222 (manufactured by Ciba Specialty Chemicals Co., Ltd.), Antigene P, 3C, FR, GA-80, (manufactured by Sumitomo Chemical Industries Co., Ltd.), and the like can be given. As examples of the UV absorbers, Tinuvin P, 234, 320, 326, 327, 328, 329, 213 (manufactured by Ciba Specialty Chemicals Co., Ltd.), Seesorb 102, 103, 110, 501 , 202, 712, 704
(manufactured by Shipro Kasei K.K.), and the like can be given. As examples of the light stabilizers, Tinuvin 292, 144, 622LD (manufactured by Ciba Specialty Chemicals Co., Ltd.), Sanol LS770 (manufactured by Sankyo Co., Ltd.), TM-061 (manufactured by Sumitomo Chemical Co., Ltd.), and the like can be given. As examples of the silane coupling agents, γ-aminopropyltriethoxysilane, γ- mercaptopropyltrimethoxy-silane, γ-methacryloxypropyltrimethoxysilane, and the like, and commercially available products such as SH6062, 6030 (manufactured by Dow Corning Toray Silicone Co., Ltd.), and KBE903, 603, 403 (manufactured by Shin-Etsu Chemical Co., Ltd.) can be given. Furthermore, other oligomers and polymers, as well as other additives can optionally be added to the liquid curable resin composition of the present invention inasmuch as characteristics of the composition of the present invention are not impaired.
Examples of such other oligomers and polymers include polyester (meth)acrylate, epoxy (meth)acrylate, polyamide (meth)acrylate, siloxane polymers having a (meth)acryloyloxy group, glycidyl methacrylate, and the like.
The composition of the present invention is cured by heat or radiation. Radiation used herein includes infrared rays, visible rays, ultraviolet rays, X-rays, electron beams, α-rays, β-rays, γ-rays, and the like. Particularly preferred radiation is ultraviolet rays. ln view of ensuring excellent handling properties and applicability, the viscosity of the liquid curable resin composition of the present invention is in the range of 0.1-10 Pa s, preferably 1-8 Pa s, and particular preferably 2-6 Pa s. Cured materials made from the resin composition of the present invention have high modulus of elasticity and breaking elongation, and at the same time, exhibit superior surface characteristics with a small adhering force. Therefore, the resin composition is useful as a secondary material or bundling material for optical fibers. The cured material must have modulus of elasticity of at least 50 MPa, preferably more than 200 MPa, and particularly preferably more than 400 MPa. If the modulus of elasticity is less than 50 MPa, an attenuation loss of the optical fiber may be too large to serve the product to the above-mentioned application. In addition, the cured product preferably has breaking elongation of 20% or more, preferably 25% or more, and more preferably 30% or more. If the breaking elongation is less than 20%, optical fibers may be more easily broken. Moreover, the cured products preferably have a water absorption rate of 3% or less, preferably 2.7% or less, and more preferably 2.4% or less. If the water absorption rate is more than 3%, the transmission loss may increase when the optical fiber is dipped in warm water. A film adhering force is a particularly important characteristic because optical fibers are stored or transported under the conditions in which secondary materials or bundling materials are in contact with each other. For this reason, film adhering force preferably is 0.09 N/cm or less, preferably 0.08 N/cm or less, and more preferably 0.07 N/cm or less. The present invention will be explained in more detail by examples, which are not intended to be limiting of the present invention.
Preparation Example 1
Synthesis example of urethane fmettϋacrviate
A reaction vessel equipped with a stirrer was charged with polypropylene glycol having a number average molecular weight of 3200 (402 9 g), tolylene dusocyanate (263 9 g,) 2,6-dι-t-butyl-p-cresol (0 24 g), and phenothiazme (0 08 g) The mixture was cooled to 15°C while stirπng After the addition of dibutyl tin dilaurate (0 8 g), 2-hydroxypropyl acrylate (87 9 g) was added dropwise while controlling the temperature to less than 30°C After the addition, the mixture was stirred for one hour at 40°C Next, 2-hydroxyethyl acrylate (244 2 g) was added dropwise while controlling the temperature to less than 60°C After the addition, the mixture was stirred at 60°C The reaction was terminated when the residual isocyanate was 0 1 wt% or less The urethane (meth)acrylate oligomer thus obtained is designated as "Polymerizable oligomer
(a)"
Examples 1-2 and Comparative Example A-B
A reaction vessel equipped with a stirrer was charged with the compounds listed in Table 1 in the proportion shown in Table 1 The mixture was stirred at 50°C to produce a homogeneous solution, thus obtaining the compositions of Examples and Comparative Examples Mechanical properties, viscosity, and surface characteπstic of the resulting cured products were evaluated according to the following methods Results are shown in Table 1
(1) Measuring method of viscosity The viscosity at 25°C of the compositions obtained in Examples and Comparative Examples was measured Viscometer B8H-BII manufactured by Tokimeck Co , Ltd was used for the viscosity measurement
(2) Measuring methods of modulus of elasticity and breaking elongation Modulus of elasticity and breaking elongation of the cured products obtained from the compositions of Examples and Comparative Examples were measured The liquid compositions were applied to a glass plate using an applicator with a thickness of 381 μm, irradiated by ultraviolet rays by using a 3 5 kW metal ha de lamp ("SMX-3500/F-OS", manufactured by ORC Co , Ltd ) at a dose of 1 0 J/cm2 in air to form cured coatings having a thickness of about 200 μm Test specimens for measurement of modulus of elasticity and breaking elongation were obtained by cutting the cured films into strips with a width of 0.6 cm. The modulus of elasticity and breaking elongation were measured according to JIS K7127 using the test specimens thus obtained. The measurement was carried out at a bench mark distance of 25 mm, a temperature of 23°C, and a humidity of 50%RH. Drawing rates of 1 mm/min and 50 mm/min were adopted respectively for measurement of modulus of elasticity and breaking elongation.
(3) Evaluation method for surface characteristics
An adhering force between cured films obtained in Examples and Comparative Examples were measured to evaluate the surface characteristics. The liquid compositions were applied to a glass plate using an applicator with a thickness of 127 μm, irradiated by ultraviolet rays by using a 3.5 kW metal halide lamp ("SMX-3500/F-OS", manufactured by ORC Co., Ltd.) at a dose of 1.0 J/cm2 in air to form cured coatings having a thickness of about 70 μm. The cured film was divided into two pieces, which were immediately caused to adhere with the upper surfaces (the surfaces which had been in contact with air) face-to-face. The adhered films were conditioned at 23°C and 50% RH for 24 hours, and cut into strips with a width of 1 cm to obtain test specimens for measuring adhering force. The adhered films were held with upper and lower chucks of a tensile machine and peeled at a tensile rate of 50 mm/min. to measure the force required for the films to be peeled. The measurement was carried out at a temperature of 23°C and a relative humidity of 50%. The smaller the adhesion force, the better the surface characteristics.
(4) Measuring method of water absorption
The water absorption rate of the cured materials made from the compositions obtained in Examples and Comparative Examples was measured. The liquid compositions were applied to a glass plate using an applicator with a thickness of 381 μm, irradiated by ultraviolet rays by using a 3.5 kW metal halide lamp ("SMX-3500/F-OS", manufactured by ORC Co., Ltd.) at a dose of 1.0 J/cm2 in air to form cured coatings having a thickness of about 200 μm. The cured film was cut into pieces having a weight of about 1 g each and dried at 50°C under reduced pressure for 24 hours, before measuring the weight (W1). Next, the cured film pieces were dipped in water at 23°C for 24 hours, followed by measurement of the weight (W2). The cured film pieces were dried at 50°C under reduced pressure for 24 hours, then the weight (W3) was measured. The water absorption rate was determined according to the following formula (1) Water absorption (%) = 100 x (W2 - W3)/W1
The components shown in Table 1 are as follows
Irgacure 651 and Irgacure 907 Photopolymerization initiator (manufactured by Ciba Specialty Chemicals Co ) Irganox 1035 Antioxidant (manufactured by Ciba Specialty Chemicals Co )
[Table 1]
Figure imgf000016_0001
As can be seen from Table 1 , the liquid curable resin compositions comprising a urethane (meth)acrylate oligomer (A), C4-C-ι2 alkyl (meth)acrylate (B), and polymerization initiator exhibit excellent bundling properties and produce cured products having not only high modulus of elasticity and breaking elongation, but also superior surface characteristics with small adhering force

Claims

1. Coated optical fiber comprising an outer coating layer being a cured coating from a liquid curable resin composition comprising: (A) a urethane (meth) acrylate obtained by the reaction of a polyol compound, a dusocyanate compound, and a hydroxyl group-containing (meth)acrylate compound, or a urethane (meth)acrylate obtained by the reaction of a dusocyanate compound and a hydroxyl group-containing (meth)acrylate compound, (B) a (meth)acrylate compound shown by the following formula (1),
CH2=C(R1)-COO-CnH2n+ι (1)
wherein R represents a hydrogen atom or a methyl group and n is an integer from 4 to 12, and
(C) a polymerization initiator, wherein the cured coating of the liquid curable resin composition has a modulus of elasticity of 50 MPa or more at 23°C.
2. The coated optical fiber according to claim 1, wherein the integer n in the formula (1) is 8, 9 or 10.
3. The coated optical fiber according to claim 2, wherein the component (B) is 2-ethylhexyl acrylate, octyl-decylacrylate or isodecylacrylate.
4. The coated optical fiber according to any one of claims 1-3, further comprising a component (D) which is a polymerizable unsaturated monomer other than the component (B).
5. The coated optical fiber according to any one of claims 1 to 4, of which the cured products have modulus of elasticity of 200 MPa or more.
6. A coated optical fiber according to any one of claims 1 to 5, in which the cured coating has a breaking elongation of 30% or more.
7. A coated optical fiber according to any one of claims 1 to 6, in which the cured coating has an adhering force of 0.08 N/cm or less.
8. A coated optical fiber according to any one of claims 1 to 7 wherein the outer coating is a secondary material or a bundling material for optical fibers.
PCT/NL2000/000944 1999-12-24 2000-12-21 Optical fiber coating compositions WO2001047824A1 (en)

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JP36685299A JP4197216B2 (en) 1999-12-24 1999-12-24 Liquid curable resin composition and cured product thereof

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EP1362835A1 (en) * 2001-02-20 2003-11-19 Sumitomo Electric Industries, Ltd. Coated optical fiber, optical fiber tape core using it and optical fiber unit
US6833368B2 (en) 2000-09-29 2004-12-21 Astrazeneca Ab 1, 2, 5, 10-tetrahydropyridazino[4, 5-b]quinoline-1,10-diones and their use for the treatment of pain
WO2008120984A1 (en) * 2007-03-29 2008-10-09 Dsm Ip Assets B.V. Curable liquid resin composition
US20110070433A1 (en) * 2009-09-24 2011-03-24 Lintec Corporation Sheet and Adhesive Sheet
US9559073B2 (en) 2011-03-22 2017-01-31 Lintec Corporation Base film and pressure-sensitive adhesive sheet provided therewith
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JP2020132783A (en) * 2019-02-21 2020-08-31 ダイセル・オルネクス株式会社 Urethane (meth)acrylate, active energy ray-curable composition comprising the same and its cured product

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JP4763244B2 (en) * 2004-03-15 2011-08-31 Ｊｓｒ株式会社 Liquid curable resin composition
JP5307317B2 (en) * 2005-09-15 2013-10-02 Ｊｓｒ株式会社 Liquid curable resin composition
JP5162525B2 (en) * 2009-06-09 2013-03-13 Ｊｓｒ株式会社 Liquid curable resin composition

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US6833368B2 (en) 2000-09-29 2004-12-21 Astrazeneca Ab 1, 2, 5, 10-tetrahydropyridazino[4, 5-b]quinoline-1,10-diones and their use for the treatment of pain
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EP1362835A4 (en) * 2001-02-20 2008-04-09 Sumitomo Electric Industries Coated optical fiber, optical fiber tape core using it and optical fiber unit
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US9534151B2 (en) * 2009-09-24 2017-01-03 Lintec Corporation Sheet and adhesive sheet
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CN109438657A (en) * 2018-11-01 2019-03-08 无锡阿科力科技股份有限公司 A kind of polyurethane acroleic acid oligomer and its preparation method and application
JP2020132783A (en) * 2019-02-21 2020-08-31 ダイセル・オルネクス株式会社 Urethane (meth)acrylate, active energy ray-curable composition comprising the same and its cured product
JP7257815B2 (en) 2019-02-21 2023-04-14 ダイセル・オルネクス株式会社 Urethane (meth)acrylate, active energy ray-curable composition containing the same, and cured product thereof

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