EP0137800A1 - Procede d'enrobage de substrats filiformes - Google Patents

Procede d'enrobage de substrats filiformes

Info

Publication number
EP0137800A1
EP0137800A1 EP84900715A EP84900715A EP0137800A1 EP 0137800 A1 EP0137800 A1 EP 0137800A1 EP 84900715 A EP84900715 A EP 84900715A EP 84900715 A EP84900715 A EP 84900715A EP 0137800 A1 EP0137800 A1 EP 0137800A1
Authority
EP
European Patent Office
Prior art keywords
coating
radiation
substrates
photoreactive
fibers
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP84900715A
Other languages
German (de)
English (en)
Inventor
Paul BÖRZEL
Ernst Häring
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
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 BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Publication of EP0137800A1 publication Critical patent/EP0137800A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/4438—Means specially adapted for strengthening or protecting the cables for facilitating insertion by fluid drag in ducts or capillaries
    • 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

Definitions

  • the invention relates to a method for coating filamentary substrates, e.g. Fibers, threads, wires or the like
  • optical fibers In the field of optical fibers, i.e. a sub-area of optics, which is becoming increasingly important in the field of optoelectronic information transmission systems, e.g. Telephone and television networks, EDP data transmission with a high transmission density with a wide bandwidth and low attenuation, the transmission of light energy takes place through multiple total reflection in glass fibers.
  • thin fibers made of highly transparent optical glasses, predominantly high-purity quartz, possibly with doping of suitable foreign elements, are used.
  • the fibers can be surrounded by a jacket of another glass with a low refractive index that is a few thousandths of a mm thick.
  • Such glasses can also have a refractive index that varies from the inside out. They are called gradient fibers.
  • Such so-called optical fibers are manufactured in diameters from 0.005 to 0.5 mm and processed into so-called fiber-optic components.
  • Such so-called fiber optic cables usually consist of a bundle of flexible individual fibers in one
  • Photopolymerization is known in the field of synthetic resin and coating technology. Here are z.8. UV radiation coating materials hardened.
  • Various resin groups that are interesting as binders have become known for use in photopolymerizable coating systems, e.g. unsaturated polyesters, polyester acrylates, epoxy acrylates (vinyl ester resins), urethane acrylates, unsaturated acrylate copolymers.
  • Such resins, also called prepolymers are optionally processed in combination with copolymerizable monomers.
  • these are vinylically unsaturated compounds, for example esters of acrylic acid, methacrylic acid, maleic acid, fumaric acid or their homologues or, for example, vinyl laromatics or vinyl lactams.
  • Photopolymerizable coating systems range from primers to top coats and from thick layers, e.g. Polishing varnishes on wood, down to thin layers, e.g. Printing varnishes on paper.
  • the film formation can also be carried out by an appropriate ionic mechanism.
  • Appropriate UV initiators are used for this purpose, which form ions when exposed to UV radiation.
  • the radical chain polymerization on which UV radiation curing is based can, however, also be carried out by elec tron radiation are triggered.
  • elec tron radiation are triggered.
  • less light-absorbing than electron-absorbing pigments and fillers are preferred for the absorption according to the invention.
  • the invention has for its object to provide a method for sheathing thread-like and thus flexible substrates, in which the sheathing film is hard on the outside but soft on the side facing the substrate, and despite this different hardening, the method can be carried out quickly and easily should be.
  • a radiation-reactive system pigmented with fillers and / or dyes pigmented with opaque or inhibiting the passage of light is applied to the substrate to be coated and is subsequently exposed to a radiation polymerization.
  • Various resin groups which are interesting as binders can be used as photoreactive systems, for example unsaturated polyesters, polyester acrylates, epoxy acrylic latex (vinyl ester resins), urethane acrylates, unsaturated acrylate copolymers.
  • Such resins, also called prepolymers are optionally processed in combination with copolymerizable monomers. The following examples can be given as quantities:
  • resins 99-1 percent by weight preferably 99-50 percent by weight, for monomers 1-99 percent by weight, preferably 1 to 50 percent by weight, for photoinitiators 0.1-10 percent by weight, preferably 0.5-5 percent by weight, for synergists 0.1-15 % By weight, preferably 1-5% by weight.
  • Unsaturated polyester resins which are linear polycondensation products from unsaturated dicarboxylic acids and polyhydric alcohols, which are preferred in copolymerizable monomers, mostly monostyrene, in the coating materials according to the invention, but which have acrylic or methacrylic acid esters dissolved.
  • the number of components that can be used to construct the polyester is large.
  • the technically most important unsaturated dicarboxylic acids are maleic and fumaric acid. Some of them can be replaced by saturated, also aromatic, dicarboxylic acids such as phthalic acid, tetrahydrophthalic acid, adipic acid and others.
  • the polyalcohols used are preferably 1,2-propylene glycol and ethylene glycol. However, ether diols, such as diethyl lycol, are also of technical importance and dipropylene glycol.
  • Unsaturated acrylic resins are not to be understood here as the non-crosslinking acrylic resins which have been known for years or which have been self-crosslinking or externally crosslinking via condensation reactions, but rather a resin group which is capable of crosslinking vinyl polymerisation due to acrylic acid ester groups.
  • Such raw materials are accessible, for example, by copolymerizing a wide variety of monomers, such as Ethyl acrylate, 2-ethylhexyl acrylate, butyl acrylate, methyl methacrylate, styrene and others with e.g. Glycidylmethacry lat and subsequent implementation of the Oxi ranruppen with free acrylic acid.
  • Further prepolymers are obtained e.g. by adding acrylic acid to epoxy resins e.g. based on bisphenol A, this leads to so-called epoxy acrylates or e.g. by reacting hydroxyl group-functional acrylic acid esters with monofunctional or polyfunctional isocyanates.
  • photoinitiators for radical chain polymerization all the products that can also be used for conventional UV coatings are suitable.
  • Suitable as opaque pigments, fillers or dyes which block the passage of light are those which, by scattering and / or absorption, reduce the intensity of the radiation acting with increasing depth of penetration.
  • the following substance groups, each with a large number of possible individual substances, are used without claiming to be complete
  • achromatic absorbent and / or scattering pigments e.g. B. titanium dioxide, zinc sulfate, etc.
  • organic fillers such as. B. polyolefin powder, waxes or the like.
  • the finished coatings can be colorless, achromatic or brightly colored, the color additionally as a distinguishing feature of the individual optical waveguide - or other filamentary substrates, such as, for. B. mineral (inorganic) fibers, organic fibers (textile threads) or metal wires can serve.
  • a section through a glass fiber is shown purely schematically in the drawing.
  • a quartz thread is pulled vertically downward from the melt and, after a cooling section, passes through a storage vessel with liquid reactive lacquer.
  • the thread leaves this vessel vertically through a nozzle, the thread all around with a liquid lacquer layer of e.g. 50 ⁇ m thickness is encased.
  • the thread then runs through an irradiation section, wherein it is irradiated and cured by the radiation from a UV lamp arranged parallel to the thread, or else a plurality of lamps.
  • the optical waveguide coated in this way and coated with a UV protective lacquer can then be wound up.
  • the UV protective lacquer is applied in a layer thickness of 60 ⁇ m to a glass plate which has been sprayed with a separating layer.
  • This varnish is irradiated with two UV lamps, each with an output of 80 W / cm, the throughput speed being 40 m / min.
  • the film After the irradiation, the film is subjected to a measurement of the pendulum damping in accordance with DIN 53 157. A measured value of 89 s is obtained.
  • Pendulum damping formerly known as pendulum hardness, characterizes the property of the coating film to give in to the pressure and friction of a foreign body.
  • the high measured value indicates good hardness and greater resistance to the penetration of a foreign body.
  • the lower measured value indicates lower hardness, but the ability to act through distribute elastic deformation in the layer and thus minimize the pressure on the underlying boundary layer of the optical waveguide.
  • the glass fiber 1 has a thin diameter of 0.1 mm and the sheath 2 surrounding the glass fiber 1 has a layer thickness of 0.06 mm.
  • the jacket 2 is, as indicated in the drawing, formed in two parts, namely has a soft inner core 3 and a hard outer jacket 4, with the transition, of course, runs continuously ver, see the soft inner core 3 and the hard outer jacket 4 not so abruptly is as shown in the drawing (hardness gradient).
  • Such a procedure ensures that the glass fiber lying inside is covered by a jacket and is protected against mechanical stresses, which lies against the glass fiber with a soft layer, but is covered on the outside with a hard and thus high mechanical strength layer.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

Procédé d'enrobage de substrats filiformes où l'on utilise comme matériau d'enrobage une résine synthétique photopolymérisable mais qui est mélangée avec des pigments opaques, si bien que la profondeur de pénétration des rayons provoquant la photopolymérisation est limitée et qu'ainsi la densité de réticulation, et avec elle la dureté, va en diminuant depuis l'extérieur vers l'intérieur.
EP84900715A 1983-02-10 1984-02-07 Procede d'enrobage de substrats filiformes Withdrawn EP0137800A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833304524 DE3304524A1 (de) 1983-02-10 1983-02-10 Verfahren zum ummanteln von fadenfoermigen substraten
DE3304524 1983-02-10

Publications (1)

Publication Number Publication Date
EP0137800A1 true EP0137800A1 (fr) 1985-04-24

Family

ID=6190466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84900715A Withdrawn EP0137800A1 (fr) 1983-02-10 1984-02-07 Procede d'enrobage de substrats filiformes

Country Status (5)

Country Link
EP (1) EP0137800A1 (fr)
JP (1) JPS60500408A (fr)
DE (1) DE3304524A1 (fr)
IT (1) IT1175771B (fr)
WO (1) WO1984003085A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8911959D0 (en) * 1988-05-28 1989-07-12 Ici Plc Coated optical fibres
JPH0387706A (ja) * 1989-06-26 1991-04-12 Sumitomo Electric Ind Ltd 光ファイバ心線
DE3926592A1 (de) * 1989-08-11 1991-02-14 Rheydt Kabelwerk Ag Optische faser
CZ282486B6 (cs) * 1991-07-01 1997-07-16 British Telecommunications Public Limited Company Optická vlákna
AU8132398A (en) * 1997-06-18 1999-01-04 Dsm N.V. Radiation-curable optical fiber coatings having reduced yellowing and fast cure speed

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1494963A (en) * 1975-03-18 1977-12-14 Telephone Cables Ltd Optical fibre waveguides and their manufacture
US4125644A (en) * 1977-05-11 1978-11-14 W. R. Grace & Co. Radiation cured coatings for fiber optics
US4482204A (en) * 1980-02-25 1984-11-13 At&T Bell Laboratories Ultraviolet absorbers in optical fiber coatings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8403085A1 *

Also Published As

Publication number Publication date
IT8419560A0 (it) 1984-02-10
WO1984003085A1 (fr) 1984-08-16
DE3304524A1 (de) 1984-08-16
JPS60500408A (ja) 1985-03-28
IT1175771B (it) 1987-07-15

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840725

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI NL SE

17Q First examination report despatched

Effective date: 19860206

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BASF LACKE & FARBEN AKTIENGESELLSCHAFT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BASF LACKE & FARBEN AKTIENGESELLSCHAFT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BASF LACKE + FARBEN AKTIENGESELLSCHAFT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860617

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HAERING, ERNST

Inventor name: BOERZEL, PAUL