EP1260526A1 - Fluoropolymer and electric wire and cable both coated with the same - Google Patents

Fluoropolymer and electric wire and cable both coated with the same Download PDF

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Publication number
EP1260526A1
EP1260526A1 EP00956959A EP00956959A EP1260526A1 EP 1260526 A1 EP1260526 A1 EP 1260526A1 EP 00956959 A EP00956959 A EP 00956959A EP 00956959 A EP00956959 A EP 00956959A EP 1260526 A1 EP1260526 A1 EP 1260526A1
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EP
European Patent Office
Prior art keywords
mfr
fluorine
electric wire
containing polymer
polymer
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Application number
EP00956959A
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German (de)
French (fr)
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EP1260526A4 (en
Inventor
Yoshiyuki Hiraga
Masayuki Namimatsu
Hiroyuki Imanishi
Satoshi Komatsu
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Daikin Industries Ltd
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Daikin Industries Ltd
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Publication of EP1260526A1 publication Critical patent/EP1260526A1/en
Publication of EP1260526A4 publication Critical patent/EP1260526A4/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/2806—Protection against damage caused by corrosion

Definitions

  • the present invention relates to a fluorine-containing polymer, and an electric wire and cable coated therewith and, more particularly, to a fluorine-containing polymer containing a very small amount of an alkali metal and an alkali earth metal, and an electric wire and cable coated with the polymer.
  • TFE tetrafluoroethylene
  • a polymer having unstable polymer main chains and polymer terminal groups When a polymer having unstable polymer main chains and polymer terminal groups is used as a coating material for electric wire or cable, they are decomposed by heat or a shear force applied during coating to form cells and voids in the coating material and, therefore, a core wire can not be completely coated and insulating performances are lowered.
  • the kind of the unstable polymer terminal group varies depending on the polymerization method and the kind of a polymerization initiator and a chain transfer agent.
  • a conventional persulfate salt for example, ammonium persulfate, potassium persulfate, etc.
  • carboxylic acid terminal groups are formed. It is known that these carboxylic acid terminal groups are a source of a volatile component produced during melting of the polymer.
  • U.S. Patent No. 3,085,083 has proposed a method of stabilizing the unstable terminal groups by bringing a fluorine-containing polymer into contact with water at a temperature within a range from 200°C to 400°C (wet heat treatment) , while Japanese Kokoku (Examined) Patent Publication No. 5 - 10204 (corresponding to U.S. Patent No.
  • 4,626,587) has proposed a method of reducing the number of unstable main chains of a TFE/HFP copolymer by applying a high shear force to the copolymer in a twin-screw extruder and subjecting the resulting pellets to the fluorination reaction to improve the color tone of the pellets and to stabilize the unstable terminal groups.
  • U.S. Patent No. 3,085,083 also describes that a base, a neutral salt or a basic salt, which contains an alkali metal or an alkali earth metal, is added to increase a reaction rate in a wet heat treatment.
  • a base or salt of the alkali metal or alkali earth metal is often added.
  • a fluorine-containing polymer prepared by using a compound containing an alkali metal or an alkali earth metal (for example, polymerization initiator) or a fluorine-containing polymer post-treated with a compound containing an alkali metal or an alkali earth metal contains a large amount of the alkali metal or alkali earth metal, electrical characteristics of an electric wire or cable coated with the fluorine-containing polymer are likely to be impaired and a core wire is likely to be corroded.
  • an object of the present invention provides a fluorine-containing polymer, which does not impair electrical characteristics of a coated electric wire and does not corrode a core wire, although it contains an alkali metal or an alkali earth metal, and an electric wire or cable coated with the fluorine-containing polymer.
  • the object described above can be achieved by a fluorine-containing polymer comprising 70 to 95% by weight of tetrafluoroethylene, 5 to 25% by weight of hexafluoropropylene and 0 to 20% by weight of perfluoroalkyl vinyl ether, wherein a melt flow rate (MFR) (g/10 min., ASTM D2116) at 372°C is within a range from 0.1 to 100, and the total content (ppm) of an alkali metal and an alkali earth metal does not exceed the value obtained by calculating from the melt flow rate (MFR) at 372°C according to the formula (1) : 5.2 ⁇ e 0.125(MFR) + 2 and exceeds the value obtained by calculating according to the formula (2) : 0.35 ⁇ e 0.125(MFR) and by an electric wire or cable coated with the fluorine-containing polymer.
  • MFR melt flow rate
  • the fluorine-containing polymer used in the present invention is, for example, a copolymer comprising at least two monomers selected from the group consisting of tetrafluoroethylene, hexafluoropropylene and perfluoroalkyl vinyl ether.
  • the fluorine-containing polymer to be treated is a tetrafluoroethylene/hexafluoropropylene copolymer (FEP)
  • the copolymer preferably comprises 72 to 96% by weight of tetrafluoroethylene and 4 to 28% by weight of hexafluoropropylene.
  • the fluorine-containing polymer is a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA)
  • the copolymer preferably comprises 92 to 99% by weight of tetrafluoroethylene and 1 to 8% by weight of perfluoropropyl vinyl ether.
  • the fluorine-containing polymer is a copolymer of tetrafluoroethylene and a plurality of perfluoroalkyl vinyl ethers (MFA)
  • the copolymer preferably comprises 84 to 99.45% by weight of tetrafluoroethylene, 0.5 to 13% by weight of perfluoromethylvinyl ether, and 0.05 to 3% by weight of perfluoroalkyl vinyl ether having alkyl other than methyl, such as perfluoropropyl vinyl ether.
  • polymers may be prepared by copolymerizing the other monomer in such amount that essential properties of each polymer are not impaired.
  • the other monomer include hexafluoropropylene, perfluoroalkyl vinyl ether, ethylene, vinylidene fluoride and chlorotrifluoroethylene.
  • the fluorine-containing polymer is preferably prepared by the emulsion polymerization or suspension polymerization, particularly the emulsion polymerization.
  • the polymerization conditions are the same as those in the case of the conventional emulsion polymerization or suspension polymerization, except that the amount of the compound containing the alkali metal or alkali earth metal (for example, a polymerization initiator, a chain transfer agent, a dispersant, etc.) is controlled so that the amount of the alkali metal or alkali earth metal does not exceed the total content thereof to be contained in the resulting polymer.
  • the alkali metal or alkali earth metal for example, a polymerization initiator, a chain transfer agent, a dispersant, etc.
  • the amount In the post-treatment of the resulting fluorine-containing polymer, for example, before or after the step of drying the fluorine-containing polymer or during the extrusion step, even when using the compound containing the alkali metal or alkali earth metal, the amount must be controlled so that the total amount of the alkali metal or alkali earth metal in the fluorine-containing polymer is within the above defined range.
  • the total content (ppm) of the alkali metal or alkali earth metal in the fluorine-containing polymer does not exceed the value obtained by calculating from the melt flow rate (MFR) (g/10 min., ASTM D2116) at 372°C according to the formula (5): 1.3 ⁇ e 0.125(MFR) + 2 and exceeds the value obtained by calculating according to the formula (6): 0.7 ⁇ e 0.125(MFR)
  • alkali metal or alkali earth metal examples include hydroxides such as potassium hydroxide or sodium hydroxide, carbonate salts such as potassium carbonate or calcium carbonate, sulfate salts such as potassium sulfate, or nitrate salts such as potassium nitrate.
  • the fluorine-containing polymer of the present invention does not substantially have unstable terminal groups.
  • -CF 2 H accounts for at least half of polymer chain terminals and substantially all polymer chain terminals comprise -CF 2 H, or -CF 2 H and -CH 3 .
  • the fluorine-containing polymer is a tetrafluoroethylene/hexafluoropropylene copolymer (FEP), a tetrafluoroethylene/perfluorovinyl ether polymer (PFA), a copolymer of tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether, or a copolymer of tetrafluoroethylene, perfluoromethyl vinyl ether and perfluoroalkyl vinyl ether having alkyl other than methyl, such as perfluoropropyl vinyl ether, it may have a melt viscosity of 0.1 to 100 kPa ⁇ s at 372°C.
  • the coated electric wire or cable can be produced in the same method of producing an electric wire and cable by coating with a conventional fluororesin, except that the fluorine-containing polymer described above is used as the coating material.
  • the kind of the electric wire or cable is not specifically limited.
  • the core wire may be a single core, a strand wire, or a coaxial cable.
  • the fluorine-containing polymer used in the present invention can also be used as an internal insulating material.
  • a melt flow rate (g/10 min.) was measured at 372°C in accordance with ASTM D2116.
  • a dielectric dissipation factor was measured by a standing wave method using a coaxial cable in accordance with ASTM D2520.
  • emulsion polymerization method polymerization pressure: 4.2 MPa, polymerization temperature: 95°C, initiator: ammonium persulfate (APS), emulsifier: C 7 F 15 COONH 4
  • the dispersion was dried again and extruded into pellets in a twin-screw extruder. During the extension, water and air were fed (extrusion amount: 50 kg/hour, water: 5.5 kg/hour, air: 50 NL/min.) in the extruder to stabilize polymer terminals by the wet heat treatment.
  • the structure of the polymer terminals after the treatment was analyzed by a Fourier transform infrared spectroscopy. As a result, those other than -CF 2 H terminal groups were not detected.
  • the dielectric dissipation factor was measured at 500 MHz. As a result, it was 6.10 ⁇ 10 -4 .
  • the dielectric dissipation factor of a polymer which was treated in the same manner as in Example 1 except that the content of potassium was changed to 70 ppm, was measured. As a result, it was 8.94 ⁇ 10 -4 .
  • the dielectric dissipation factor of a polymer which was treated in the same manner as in Example 2 except that the content of potassium was changed to 100 ppm, was measured. As a result, it was 9.95 ⁇ 10 -4 .
  • coated electric wires each having a wire size (core material of copper) of 511 ⁇ m (20.1 mil) and a coating thickness of 196 ⁇ m (7.7 mil) were produced. These coated electric wires were produced by molding at a rate of 305 m/min (1000 ft/min) using a single-screw extruder having a diameter of 5.1 cm (2 inch).

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Organic Insulating Materials (AREA)
  • Insulated Conductors (AREA)

Abstract

Although an electric wire or cable, which is coated with a fluorine-containing polymer comprising tetrafluoroethylene and hexafluoropropylene and, if necessary, perfluoroalkyl vinyl ether, wherein a melt flow rate (MFR) at 372 DEG C is within a range from 0.1 to 100, and the total content (ppm) of an alkali metal and an alkali earth metal does not exceed the value obtained by calculatingt from the melt flow rate (MFR) at 372 DEG C according to the formula (1) : <DF NUM="(1)">5.2 x e<0.125(MFR)> + 2 </DF> and exceeds the value obtained by calculating according to the formula (2) : <DF NUM="(2)">0.35 x e<0.125(MFR)> </DF> contains the alkali metal or alkali earth metal, electrical characteristics of the coated electric wire are not impaired and a core wire is not corroded.

Description

FIELD OF THE INVENTION
The present invention relates to a fluorine-containing polymer, and an electric wire and cable coated therewith and, more particularly, to a fluorine-containing polymer containing a very small amount of an alkali metal and an alkali earth metal, and an electric wire and cable coated with the polymer.
RELATED ART
For example, tetrafluoroethylene (TFE)/hexafluoropropylene (HFP) copolymers prepared by the emulsion polymerization contain polymer main chains and polymer terminals which are unstable to heat and a shear force.
When a polymer having unstable polymer main chains and polymer terminal groups is used as a coating material for electric wire or cable, they are decomposed by heat or a shear force applied during coating to form cells and voids in the coating material and, therefore, a core wire can not be completely coated and insulating performances are lowered.
The kind of the unstable polymer terminal group varies depending on the polymerization method and the kind of a polymerization initiator and a chain transfer agent. For example, when a conventional persulfate salt (for example, ammonium persulfate, potassium persulfate, etc.) is used as the polymerization initiator in the emulsion polymerization, carboxylic acid terminal groups are formed. It is known that these carboxylic acid terminal groups are a source of a volatile component produced during melting of the polymer.
Depending on the conditions on melting, groups such as olefin (-CF=CF2) and acid fluoride (-COF) are sometimes formed at polymer terminals and these terminal groups can cause cells or voids in a final product of the polymer.
To solve these problems of cells or voids in the polymer caused by unstable main chains or unstable terminal groups, U.S. Patent No. 3,085,083 has proposed a method of stabilizing the unstable terminal groups by bringing a fluorine-containing polymer into contact with water at a temperature within a range from 200°C to 400°C (wet heat treatment) , while Japanese Kokoku (Examined) Patent Publication No. 5 - 10204 (corresponding to U.S. Patent No. 4,626,587) has proposed a method of reducing the number of unstable main chains of a TFE/HFP copolymer by applying a high shear force to the copolymer in a twin-screw extruder and subjecting the resulting pellets to the fluorination reaction to improve the color tone of the pellets and to stabilize the unstable terminal groups.
U.S. Patent No. 3,085,083 also describes that a base, a neutral salt or a basic salt, which contains an alkali metal or an alkali earth metal, is added to increase a reaction rate in a wet heat treatment. When the wet heat treatment is employed as a method for a stabilization treatment of terminals, a base or salt of the alkali metal or alkali earth metal is often added.
Even if the fluorination reaction is conducted to stabilize terminals as in the latter case, when using potassium persulfate as a polymerization initiator, potassium remains as a residue of the initiator in the polymer.
However, when a fluorine-containing polymer prepared by using a compound containing an alkali metal or an alkali earth metal (for example, polymerization initiator) or a fluorine-containing polymer post-treated with a compound containing an alkali metal or an alkali earth metal contains a large amount of the alkali metal or alkali earth metal, electrical characteristics of an electric wire or cable coated with the fluorine-containing polymer are likely to be impaired and a core wire is likely to be corroded.
SUMMARY OF THE INVENTION
Thus, an object of the present invention provides a fluorine-containing polymer, which does not impair electrical characteristics of a coated electric wire and does not corrode a core wire, although it contains an alkali metal or an alkali earth metal, and an electric wire or cable coated with the fluorine-containing polymer.
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the object described above can be achieved by a fluorine-containing polymer comprising 70 to 95% by weight of tetrafluoroethylene, 5 to 25% by weight of hexafluoropropylene and 0 to 20% by weight of perfluoroalkyl vinyl ether, wherein a melt flow rate (MFR) (g/10 min., ASTM D2116) at 372°C is within a range from 0.1 to 100, and
   the total content (ppm) of an alkali metal and an alkali earth metal does not exceed the value obtained by calculating from the melt flow rate (MFR) at 372°C according to the formula (1) : 5.2 × e0.125(MFR) + 2 and exceeds the value obtained by calculating according to the formula (2) : 0.35 × e0.125(MFR) and by an electric wire or cable coated with the fluorine-containing polymer.
Regarding the electric wire or cable, which is coated with a fluorine-containing polymer wherein the total content (ppm) of an alkali metal and an alkali earth metal exceeds the value obtained by calculating according to the above formula (1), electrical characteristics are likely to be impaired and a core wire is likely to be corroded. On the other hand, in the case of a fluorine-containing polymer wherein the total content does not exceed the value obtained by calculating according to the above formula (2), unstable terminal groups are not sufficiently stabilized.
The fluorine-containing polymer used in the present invention is, for example, a copolymer comprising at least two monomers selected from the group consisting of tetrafluoroethylene, hexafluoropropylene and perfluoroalkyl vinyl ether.
The perfluoroalkyl vinyl ether is a vinyl ether represented by the formula (3): CF2=CFO(CF2)mF wherein m is an integer of 1 to 6, or a vinyl ether represented by the formula (4) CF2=CF[O-CF2CF(CF3)]nOC3F7 wherein m is an integer of 1 to 4.
When the fluorine-containing polymer to be treated is a tetrafluoroethylene/hexafluoropropylene copolymer (FEP), the copolymer preferably comprises 72 to 96% by weight of tetrafluoroethylene and 4 to 28% by weight of hexafluoropropylene. When the fluorine-containing polymer is a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA), the copolymer preferably comprises 92 to 99% by weight of tetrafluoroethylene and 1 to 8% by weight of perfluoropropyl vinyl ether. When the fluorine-containing polymer is a copolymer of tetrafluoroethylene and a plurality of perfluoroalkyl vinyl ethers (MFA), the copolymer preferably comprises 84 to 99.45% by weight of tetrafluoroethylene, 0.5 to 13% by weight of perfluoromethylvinyl ether, and 0.05 to 3% by weight of perfluoroalkyl vinyl ether having alkyl other than methyl, such as perfluoropropyl vinyl ether.
These polymers may be prepared by copolymerizing the other monomer in such amount that essential properties of each polymer are not impaired. Examples of the other monomer include hexafluoropropylene, perfluoroalkyl vinyl ether, ethylene, vinylidene fluoride and chlorotrifluoroethylene.
The fluorine-containing polymer is preferably prepared by the emulsion polymerization or suspension polymerization, particularly the emulsion polymerization. The polymerization conditions are the same as those in the case of the conventional emulsion polymerization or suspension polymerization, except that the amount of the compound containing the alkali metal or alkali earth metal (for example, a polymerization initiator, a chain transfer agent, a dispersant, etc.) is controlled so that the amount of the alkali metal or alkali earth metal does not exceed the total content thereof to be contained in the resulting polymer.
In the post-treatment of the resulting fluorine-containing polymer, for example, before or after the step of drying the fluorine-containing polymer or during the extrusion step, even when using the compound containing the alkali metal or alkali earth metal, the amount must be controlled so that the total amount of the alkali metal or alkali earth metal in the fluorine-containing polymer is within the above defined range.
More preferably, the total content (ppm) of the alkali metal or alkali earth metal in the fluorine-containing polymer does not exceed the value obtained by calculating from the melt flow rate (MFR) (g/10 min., ASTM D2116) at 372°C according to the formula (5): 1.3 × e0.125(MFR) + 2 and exceeds the value obtained by calculating according to the formula (6): 0.7 × e0.125(MFR)
Specific examples of the alkali metal or alkali earth metal include hydroxides such as potassium hydroxide or sodium hydroxide, carbonate salts such as potassium carbonate or calcium carbonate, sulfate salts such as potassium sulfate, or nitrate salts such as potassium nitrate.
The fluorine-containing polymer of the present invention does not substantially have unstable terminal groups.
Preferably, -CF2H accounts for at least half of polymer chain terminals and substantially all polymer chain terminals comprise -CF2H, or -CF2H and -CH3. As used herein, the expression "does not substantially have unstable terminal groups" refers to the state that the number of unstable terminal groups such as COOH, -COF and -CF=CF2 is at most 20 per 106 carbon atoms of the polymer.
When the fluorine-containing polymer is a tetrafluoroethylene/hexafluoropropylene copolymer (FEP), a tetrafluoroethylene/perfluorovinyl ether polymer (PFA), a copolymer of tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether, or a copolymer of tetrafluoroethylene, perfluoromethyl vinyl ether and perfluoroalkyl vinyl ether having alkyl other than methyl, such as perfluoropropyl vinyl ether, it may have a melt viscosity of 0.1 to 100 kPa·s at 372°C.
The coated electric wire or cable can be produced in the same method of producing an electric wire and cable by coating with a conventional fluororesin, except that the fluorine-containing polymer described above is used as the coating material.
The kind of the electric wire or cable is not specifically limited. The core wire may be a single core, a strand wire, or a coaxial cable. In the case of the coaxial cable, the fluorine-containing polymer used in the present invention can also be used as an internal insulating material.
PREFERRED EMBODIMENTS OF THE INVENTION
The following Examples and Comparative Examples further illustrate the present invention.
Physical properties were determined by the following procedures.
(1) Melt flow rate (MFR)
A melt flow rate (g/10 min.) was measured at 372°C in accordance with ASTM D2116.
(2) Dielectric dissipation factor
A dielectric dissipation factor was measured by a standing wave method using a coaxial cable in accordance with ASTM D2520.
Example 1
By the emulsion polymerization method (polymerization pressure: 4.2 MPa, polymerization temperature: 95°C, initiator: ammonium persulfate (APS), emulsifier: C7F15COONH4), a tetrafluoroethylene/hexafluoropropylene copolymer (hexafluoropropylene content: 10.0% by weight, MFR = 5) was polymerized and then coagulated by adding nitric acid after the polymerization. After dehydration and drying, an 1 wt% aqueous potassium carbonate solution was added to the polymer so that a potassium content was 4 ppm (the amount was measured by atomic adsorption spectrometry). After dispersing by a powder mixer, the dispersion was dried again and extruded into pellets in a twin-screw extruder. During the extension, water and air were fed (extrusion amount: 50 kg/hour, water: 5.5 kg/hour, air: 50 NL/min.) in the extruder to stabilize polymer terminals by the wet heat treatment.
The structure of the polymer terminals after the treatment was analyzed by a Fourier transform infrared spectroscopy. As a result, those other than -CF2H terminal groups were not detected.
The dielectric dissipation factor was measured at 500 MHz. As a result, it was 6.10 × 10-4.
Example 2
In the same manner, the dielectric dissipation factor of a tetrafluoroethylene/hexafluoropropylene copolymer (hexafluoropropylene content: 12.0% by weight, MFR = 10), which was obtained in the same manner as in Example 1 except that the proportion of the monomer was changed and the content of potassium was changed to 6 ppm, was measured. As a result, it was 6.53 × 10-4.
Comparative Example 1
The dielectric dissipation factor of a polymer, which was treated in the same manner as in Example 1 except that the content of potassium was changed to 70 ppm, was measured. As a result, it was 8.94 × 10-4.
Comparative Example 2
The dielectric dissipation factor of a polymer, which was treated in the same manner as in Example 2 except that the content of potassium was changed to 100 ppm, was measured. As a result, it was 9.95 × 10-4.
Example 3
Using a tetrafluoroethylene/hexafluoropropylene copolymer (hexafluoropropylene content: 13.5% by weight, MFR = 17, potassium content: 10 ppm) obtained in the same manner as in Example 1, coated electric wires each having a wire size (core material of copper) of 511 µm (20.1 mil) and a coating thickness of 196 µm (7.7 mil) were produced. These coated electric wires were produced by molding at a rate of 305 m/min (1000 ft/min) using a single-screw extruder having a diameter of 5.1 cm (2 inch).
After standing at room temperature for 10 days, a coated portion was peeled off and a core wire made of copper was visually observed. As a result, discoloration was not observed.
Comparative Example 4
After a coated electric wire produced by using a copolymer which was obtained in the same manner as in Example 3 except that the content of potassium was changed to 90 ppm, was allowed to stand at room temperature for 10 days, a coated portion was peeled off and a core wire made of copper was visually observed. As a result, partial discoloration (considered to be caused by corrosion of copper) was observed.

Claims (7)

  1. A fluorine-containing polymer comprising 70 to 95% by weight of tetrafluoroethylene, 5 to 25% by weight of hexafluoropropylene and 0 to 20% by weight of perfluoroalkyl vinyl ether, wherein a melt flow rate (MFR) (g/10 min., ASTM D2116) at 372°C is within a range from 0.1 to 100, and
       the total content (ppm) of an alkali metal and an alkali earth metal does not exceed the value obtained by calculating from the melt flow rate (MFR) at 372°C according to the formula (1) : 5.2 × e0.125(MFR) + 2 and exceeds the value obtained by calculating according to the formula (2): 0.35 × e0.125(MFR)
  2. A fluorine-containing polymer wherein -CF2H accounts for at least half of polymer chain terminals and substantially all polymer chain terminals comprise -CF2H, or -CF2H and -CH3.
  3. An electric wire or cable coated with a fluorine-containing polymer wherein the total content (ppm) of an alkali metal and an alkali earth metal does not exceed the value obtained by calculating from a melt flow rate (MFR) (g/10 min., ASTM D2116) at 372°C according to the formula (1) : 5.2 × e0.125(MFR) + 2 and exceeds the value obtained by calculating according to the formula (2): 0.35 × e0.125(MFR)
  4. The electric wire or cable according to claim 3, wherein -CF2H accounts for at least half of polymer chain terminals and substantially all polymer chain terminals comprise -CF2H, or -CF2H and -CH3.
  5. The electric wire or cable according to claim 3, wherein the fluorine-containing polymer is a fluorine-containing polymer prepared by emulsion polymerization.
  6. The electric wire or cable according to anyone of claims 3 to 5, wherein the fluorine-containing polymer is a copolymer comprising at least two monomers selected from the group consisting of tetrafluoroethylene, hexafluoropropylene and perfluoroalkyl vinyl ether.
  7. The electric wire or cable according to anyone of claims 3 to 6, wherein the contained alkali metal and alkali earth metal comprise at least one of potassium and sodium.
EP00956959A 1999-09-08 2000-09-06 FLUOROPOLYMER, AND ELECTRIC WIRE AND CABLE COATED WITH SAID FLUOROPOLYMER Withdrawn EP1260526A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP25418899 1999-09-08
JP25418899 1999-09-08
PCT/JP2000/006048 WO2001018076A1 (en) 1999-09-08 2000-09-06 Fluoropolymer and electric wire and cable both coated with the same

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EP1260526A1 true EP1260526A1 (en) 2002-11-27
EP1260526A4 EP1260526A4 (en) 2008-10-01

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US7126056B2 (en) 2003-05-14 2006-10-24 E. I. Du Pont De Nemours And Company High melt flow fluoropolymer
US7638709B2 (en) * 2007-05-15 2009-12-29 E. I. Du Pont De Nemours And Company Fluoropolymer wire insulation
US7723615B2 (en) 2005-05-18 2010-05-25 Daikin Industries, Ltd. Fluororesin composition and electric wire
US8080195B2 (en) 2003-11-20 2011-12-20 Daikin Industries, Ltd Process for production of fluorine-containing polymers and fluorine-containing polymers
US20170025204A1 (en) * 2015-07-22 2017-01-26 The Chemours Company Fc, Llc Usb cable for super speed data transmission
EP1622951B2 (en) † 2003-05-14 2017-08-30 The Chemours Company FC, LLC High melt flow fluoropolymer
US20180265654A1 (en) * 2015-01-20 2018-09-20 Daikin Industries, Ltd. Method for producing modified molded article of fluororesin
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EP4299622A4 (en) * 2021-02-26 2025-03-12 Daikin Industries, Ltd. FLUORINATED COPOLYMER
EP4506385A4 (en) * 2022-03-30 2026-04-08 Daikin Ind Ltd FLUORINE COPOLYMER

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