Abstract: There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit, and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the hexafluoropropylene unit of 10.3 to 11.5% by mass with respect to the whole of the monomer units, a content of the perfluoro(propyl vinyl ether) unit of 0.8 to 1.6% by mass with respect to the whole of the monomer units, and a melt flow rate at 372° C. of 10.0 to 13.0 g/10 min.

Abstract: A copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, and having a content of the fluoro(alkyl vinyl ether) unit of 2.0 to 2.8% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 5 to 23 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.

Abstract: A copolymer containing tetrafluoroethylene unit, and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.0 to 2.8% by mass with respect to the whole of the monomer units, and a melt flow rate of 23 to 30 g/10 min.

Abstract: A copolymer containing a tetrafluoroethylene unit, and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 3.4 to 3.9% by mass with respect to the whole of the monomer units, and a melt flow rate of 29 to 36 g/10 min, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of more than 50 per 106 main-chain carbon atoms. Also disclosed is a sealing tool, an injection molded article, a member to be compressed including the copolymer, and a coated electric wire including a coating layer containing the copolymer.

Abstract: A sealing member containing a copolymer containing tetrafluoroethylene unit and a perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 3.0 to 4.5% by mass with respect to the whole of the monomer units, a melt flow rate of 5 to 26 g/10 min, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of more than 50 per 106 main-chain carbon atoms, wherein the sealing member has a thickness of 0.5 to 2.5 mm. Also disclosed is a power storage assembly including the sealing member.

Abstract: A copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.8 to 3.5% by mass with respect to the whole of the monomer units, a melt flow rate of 31 to 38 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of 50 or less per 106 main-chain carbon atoms. Also disclosed is an injection molded article, a member to be compressed and a coated electric wire including the copolymer.

Abstract: A sealing member containing a copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.7 to 4.5% by mass with respect to the whole of the monomer units, a melt flow rate of 26 to 42 g/10 min, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of more than 50 per 106 main-chain carbon atoms. Also disclosed is a power storage assembly including the sealing member.

Abstract: A sealing member containing a copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro (propyl vinyl ether) unit of 4.0 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate of 26 to 37 g/10 min, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of more than 50 per 106 main-chain carbon atoms, wherein the sealing member has a thickness of 0.5 to 2.5 mm and a sealing area of 0.5 to 50 cm2, and wherein the sealing member is in a state of being compressed at a compression deformation rate of 20 to 60%. Also disclosed is a power storage assembly including the sealing member.

Abstract: A copolymer containing a tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.0 to 2.7% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.8 to 7.0 g/10 min, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of 50 or less per 106 main-chain carbon atoms. Also disclosed is a compression molded article, an extrusion formed article, a transfer molded article, a member to be compressed, a film, a tube and a coated electric wire including the copolymer.

Abstract: A copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 5.8 to 7.6% by mass with respect to the whole of the monomer units, a melt flow rate of 50 to 68 g/10 min, and the number of functional groups of —CF?CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of 50 or less per 106 main-chain carbon atoms. Also disclosed is an injection molded article and member to be compressed containing the copolymer, and a coated electric wire including a coating layer containing the copolymer.

Abstract: A perfluorodiacyl peroxide represented by the following formula (1): (C5F11COO)2 ??(1). Also disclosed is a solution containing the perfluorodiacyl peroxide, a polymerization initiator containing the perfluorodiacyl peroxide, a method for producing a polymer which includes polymerizing a radically polymerizable monomer with the perfluorodiacyl peroxide, and a perfluoroacyl chloride represent by the following formula (2): C5F11COCl (2).

Abstract: An electric wire for an in-vehicle network cable, including a conductor and a covering that covers a periphery of the conductor. The electric wire has a diameter of 0.5 to 1.5 mm. The covering contains a fluororesin that is a tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer. The fluororesin has a melt flow rate of 20 to 40 g/10 min measured at 372° C. under a 5-kg load, a relative permittivity of 2.2 or lower measured at 25° C. and 6 GHz, a melting point of 250° C. or higher, an MIT folding endurance of 2000 times or more, and a tensile elongation at 150° C. of 300% or higher. Also disclosed is an in-vehicle network cable including the electric wire and an in-vehicle network cable including a twisted pair of electric wires, at least one of which is the above-described electric wire for an in-vehicle network cable.

Abstract: A member for a non-aqueous electrolyte battery containing a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, in which the number of functional groups per 106 carbon atoms of a main chain of the copolymer is 100 or less, and a melt flow rate of the copolymer is 20 to 30 g/10 minutes.

Abstract: Provided is an injection molding method for obtaining an injection molded article using an injection molding machine by means of filling a mold cavity of a mold with a molten copolymer from a nozzle of the injection molding machine, wherein the minimum thickness of the mold cavity is 0.8 mm or less, the total projected area of the mold is 1 cm2 or more, and the copolymer is a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, wherein the number of functional groups is 100 or less per 106 main-chain carbon atoms of the copolymer.

Abstract: A tube for transferring a liquid having a refractive index of 1.35 to 1.41. The tube contains a fluoropolymer, and the fluoropolymer has a melt flow rate of 3 to 150 g/10 min, and a light transmittance at a wavelength of 300 nm of 85% or higher. Also disclosed is a container including the tube, and a fragrance product including a transparent container accommodating the liquid and the tube for sucking up the liquid.

Abstract: A fluorine-containing copolymer including tetrafluoroethylene units (a), ethylene units (b), and hexafluoropropylene units (c), a content of the tetrafluoroethylene units (a) in the total monomer units being 36.0 to 45.0% by mole; a content of the hexafluoropropylene units (c) in the total monomer units being 6 to 21% by mole; a mole ratio of the tetrafluoroethylene units (a) to the sum of the tetrafluoroethylene units (a) and the ethylene units (b), (a)/((a)+(b)), being 0.40 to 0.54; and a melt flow rate measured under the conditions of 230° C. and a load of 5 kg being 12 to 100 g/10 minutes.

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 member for a non-aqueous electrolyte battery containing a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, in which the number of functional groups per 106 carbon atoms of a main chain of the copolymer is 100 or less, and a melt flow rate of the copolymer is less than 20 g/10 minutes.

Abstract: A power storage assembly having a gasket containing a copolymer containing a tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, wherein the copolymer has a content of the fluoro(alkyl vinyl ether) unit of 2.0 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate of 0.5 to 55 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.

Abstract: A member for a non-aqueous electrolyte battery containing a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, in which the number of functional groups per 106 carbon atoms of a main chain of the copolymer is 100 or less, and a melt flow rate of the copolymer is more than 30 g/10 minutes.