Abstract: Provided is a polychlorotrifluoroethylene containing chlorotrifluoroethylene unit, wherein a content of chlorotrifluoroethylene unit is 95.0 to 100 mol % relative to all monomer units, and a ratio, (A)/(B), of a peak area (A) derived from a double bond relative to a peak area (B) derived from a main backbone is 0.020% or less.

Abstract: Provided is a formed article including polychlorotrifluoroethylene, wherein the polychlorotrifluoroethylene has a melting point of 211 to 216° C., and the formed article has a projected area of 1,000 mm2 or more, a thickness of 25 to 50 mm, and a degree of crystallinity of 65% or less.

Abstract: Provided is a double layer tube including an inner layer (A) and an outer layer (B) disposed directly on the inner layer (A), wherein the inner layer (A) comprises a copolymer (a) that comprises tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, and the outer layer (B) comprises a polymer (b) that comprises at least chlorotrifluoroethylene unit; wherein the copolymer (a) has a rate of decrease in weight of 0.05 mass % or less after heat treatment at 380° C. for 1 hour; and wherein a ratio between a thickness of the inner layer (A) and a thickness of the outer layer (B), ((A)/(B)), is 30.0/70.0 to 67.0/33.0.

Abstract: Provided is a tube comprising a tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, wherein the tube inner surface has a surface roughness Ra of 5 nm or less measured by atomic force microscopy (AFM) with an evaluation length set to 3 ?m, and the tube has an amount of metals eluted from the tube inner surface of 0.30 ng/cm2 or less.

Abstract: A magnet wire including a conductor and an insulating coating formed on an outer periphery of the conductor. The insulating coating contains a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit. The copolymer has a melt flow rate of 10 to 60 g/10 min, and the copolymer has a fluoroalkyl vinyl ether unit content of 6.2 to 8.0% by mass based on a total content of monomer units.

Abstract: The present disclosure provides a welded body having a connecting structure formed by welding a first molded body and a second molded body, wherein the first and second molded bodies contain at least one copolymer selected from the group consisting of a tetrafluoroethylene/fluoro (alkyl vinyl ether) copolymer and a tetrafluoroethylene/hexafluoropropylene copolymer, and wherein the connecting structure has a liquid contact surface to be in contact with a liquid having a solubility parameter of 14 to 35 (MPa)1/2, a welded part formed in the connecting structure is not exposed to the liquid contact surface, and the number of particles of 30 nm or larger to be eluted from the liquid contact surface in the connecting structure is 1,000 particles/ml or less.

Abstract: A tube including a tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, where the copolymer has 500 or less functional groups per 106 carbon atoms; the copolymer has a melting point of 280 to 315° C.; the copolymer has a fluoroalkyl vinyl ether unit content of 3.0 to 12.0 mass % based on total monomer units; the copolymer has a melt flow rate of 1 to 15 g/10 min; the tube releases, from an inner surface thereof, 3500 or less particles per 1 cm2 of the inner surface of the tube; and an amount of total organic carbon eluted with water from the inner surface of the tube is 50 ng or less per 1 cm2 of the inner surface of the tube.

Abstract: A member to be compressed for an electrochemical device, including a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, the copolymer having a content of the fluoroalkyl vinyl ether unit based on all the monomer units of the copolymer of 4.3% by mass or more and less than 5.5% by mass, and having a melt flow rate of 10 to 23 g/10 min.

Abstract: A method for producing a tube for a chemical solution pipe composed of a cleaned fluororesin molded article, the method including cleaning a tube-shaped fluororesin molded article with a chemical solution; and cleaning the tube-shaped fluororesin molded article with water. The cleaning with water is performed after the cleaning with a chemical solution, and the chemical solution is an alcohol or an aqueous alcohol solution.

Abstract: A wafer cup including a copolymer containing a tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit. A water contact angle of at least a part of an inner surface of the wafer cup is 80 degrees or less.

Abstract: A molded article containing a copolymer including a tetrafluoroethylene unit and a perfluoro(alkyl vinyl ether) unit, wherein a surface roughness Ra of the molded article is 0.20 ?m or less, and a water contact angle of the molded article is 80 degrees or less. Also disclosed is a method for producing the molded article.

Abstract: A molding material including a melt-fabricable fluororesin and having a metal content of 100 ng/1 g or less as measured by an ashing method. Also disclosed is a tube made of the molding material.

Abstract: A fluororesin material including a melt-fabricable fluororesin, the fluororesin material having a dielectric constant of 2.1 or less and a dielectric loss tangent of 0.00030 or less at 12 GHz. Also disclosed is a fluororesin material for high-frequency transmission including the fluororesin material and a coated electric wire for high-frequency transmission including a solid insulating coating layer made of the fluororesin material.

Abstract: A modified fluororesin material containing a modified fluororesin which contains a tetrafluoroethylene unit, a modifying monomer unit based on a modifying monomer copolymerizable with tetrafluoroethylene, and a tertiary carbon atom. The tertiary carbon atom is present in an amount of 0.001 to 0.030 mol % of a total amount of the tetrafluoroethylene unit and the modifying monomer unit. The modified fluororesin material has a linear expansion coefficient at 20° C. to 200° C. that is 10% or more lower than that of a non-modified fluororesin material. The non-modified fluororesin material contains a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with tetrafluoroethylene and containing no tertiary carbon atom. Also disclosed is a material for a circuit board including the modified fluororesin material, a laminate for a circuit board, a circuit board, and a method for producing the modified fluororesin material.

Abstract: The invention provides a molded article containing a specific fluororesin and having excellent hydrophilicity. The molded article containing the fluororesin has a melt flow rate of 1.00 g/10 min or lower and a water contact angle of 90° or smaller. The fluororesin contains at least one copolymer selected from the group consisting of a copolymer containing a tetrafluoroethylene unit and a perfluoro(alkylvinylether) unit and a copolymer containing a tetrafluoroethylene unit and a hexafluoropropylene unit.

Abstract: Provided is a formed article containing a modified polytetrafluoroethylene, wherein the modified polytetrafluoroethylene contains tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with tetrafluoroethylene, wherein a content of the modifying monomer unit in the modified polytetrafluoroethylene is 0.001 to 1% by mass based on the total amount of tetrafluoroethylene unit and the modifying monomer unit, and wherein the formed article has a thickness of 100 ?m or more, and is provided by irradiation with radiation having an acceleration voltage of 30 to 300 kV.

Abstract: A method for producing a tube, which includes: extruding a melt-fabricable fluororesin from a mold of an extruder into a form of a tube, leading the extruded melt-fabricable fluororesin to a cooling device to cool the extruded melt-fabricable fluororesin, and winding a resulting cooled tube onto a winding reel using a winding device. A gas is fed from a head end of the tube wound onto the winding reel into a hollow of the tube, the gas in the hollow is allowed to pass through a gas-introducing entrance of the mold and then through a gas-discharging hole of the mold to discharge the gas outside, thereby allowing the gas to flow along the hollow, and an internal pressure of the hollow is kept higher than atmospheric pressure and lower than 0.5 kgf/cm2.

Abstract: Provided is a method for producing an injection molded article for obtaining an injection molded article by injection molding a copolymer using an injection molding machine and a mold having a hot runner, wherein the copolymer is a copolymer containing tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, and the number of functional groups of the copolymer is 100 or less per 106 main-chain carbon atoms.

Abstract: A magnet wire including a conductor and an insulating coating formed on an outer periphery of the conductor. The insulating coating contains a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit. The copolymer has a melt flow rate of 10 to 60 g/10 min, and the copolymer has a fluoroalkyl vinyl ether unit content of 6.2 to 8.0% by mass based on a total content of monomer units.

Abstract: The present disclosure provides a welded body having a connecting structure formed by welding a first molded body and a second molded body, wherein the first and second molded bodies contain at least one copolymer selected from the group consisting of a tetrafluoroethylene/fluoro(alkyl vinyl ether) copolymer and a tetrafluoroethylene/hexafluoropropylene copolymer, and wherein the connecting structure has a liquid contact surface to be in contact with a liquid having a solubility parameter of 14 to 35 (MPa)1/2, a welded part formed in the connecting structure is not exposed to the liquid contact surface, and the number of particles of 30 nm or larger to be eluted from the liquid contact surface in the connecting structure is 1,000 particles/ml or less.