Abstract: Provided is a method for producing a fluoropolymer composition, comprising bringing a fluoropolymer raw material into contact with an oxidizing agent, wherein the fluoropolymer raw material is obtained by polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (I) containing a polymerization unit (I) derived from a monomer (I) represented by the general formula (I). CX1X3?CX2R(—CZ1Z2-A0)m??(I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

Abstract: A method for producing a fluoropolymer which method includes polymerizing a perfluoromonomer in an aqueous medium in the presence of a polymer (1) to obtain a fluoropolymer, wherein the content of a polymerized unit derived from the perfluoromonomer in the fluoropolymer is 90 mol % or more based on all polymerized units of the fluoropolymer, the polymer (1) is a polymer of a monomer (1) represented by the general formula (1): CF2?CF—O—R-(Rf-SO3M)m, a polymerized unit (1) derived from the monomer (1) in the polymer (1) is 50% by mass or more based on all polymerized units of the polymer (1), and the content of a dimer and a trimer of the monomer (1) in the polymer (1) is 1.0% by mass or less based on the polymer (1).

Abstract: A composition containing polytetrafluoroethylene and substantially free from a compound represented by Formula (3): (H—(CF2)8—SO3)qM2 wherein M2 is H, a metal atom, NR54 (where R5s may be the same as or different from each other and are each H or an organic group having 1 to 10 carbon atoms), an imidazolium optionally having a substituent, a pyridinium optionally having a substituent, or a phosphonium optionally having a substituent, and q is 1 or 2. Also disclosed is a molded boy including the composition.

Abstract: A method for producing polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a nucleating agent and a hydrocarbon anionic surfactant to obtain polytetrafluoroethylene. A total amount of the nucleating agent and the hydrocarbon anionic surfactant at the initiation of polymerization is more than 50 ppm based on the aqueous medium.

Abstract: A coating material composition containing a fluororesin, a polymer (I) containing a polymerization unit (I) derived from a monomer represented by the general formula (I) below, and an aqueous medium, wherein the content of the polymer (I) is 2,000 ppm by mass or less based on the coating material composition: CX1X3?CX2R(—CZ1Z2-A0)m??(I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

Abstract: A fluororesin composition and a molded article obtained from the fluororesin composition, the fluororesin composition containing: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; and a non-melt-flowable fluororesin B having no history of being heated to a melting point thereof or higher and being prepared by suspension polymerization. Further, the fluororesin composition has an apparent density of 0.42 g/ml or higher and 1.00 g/ml or lower, and is a powder for compression molding excluding ram extrusion molding.

Abstract: A fluororesin composition, and a molded article obtained from the fluororesin composition. The fluororesin composition containing: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; and a non-melt-flowable fluororesin B having no history of being heated to a melting point thereof or higher. The fluororesin composition contains a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with tetrafluoroethylene. Further, the fluororesin composition is a powder for compression molding excluding ram extrusion molding.

Abstract: A method for producing a fluororesin composition for compression molding excluding ram extrusion molding, the method including: mixing a powder of a fluororesin A1 having a history of being heated to a melting point thereof or higher and an aqueous dispersion containing particles of a fluororesin B1 and having a solid concentration of 50% by mass or lower to provide a mixture; and drying the mixture to provide a fluororesin composition.

Abstract: A fluororesin composition, and a molded article obtained from the fluororesin composition. The fluororesin composition containing: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; and a non-melt-flowable fluororesin B having no history of being heated to a melting point thereof or higher and being prepared by suspension polymerization. Further, the fluororesin composition has an apparent density of 0.42 g/ml or higher and 1.00 g/ml or lower, and is in the form of powder.

Abstract: A fluororesin composition having no melt flowability, and a molded article obtained from the fluororesin composition. The fluororesin composition contains: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; a melt-flowable fluororesin B; and a non-melt-flowable fluororesin C including a portion having no history of being heated to a melting point thereof or higher.

Abstract: The present disclosure provides a method for producing a fluororesin, which includes polymerizing a fluorine-containing monomer in the presence of a compound (1) having triple bond and a hydrophilic group and an aqueous medium to produce a fluororesin, a fluororesin comprising a unit based on a compound (1) having triple bond and a hydrophilic group, and a fluorine-containing monomer unit, and an aqueous dispersion comprising the fluororesin and an aqueous medium.

Abstract: A method for producing a fluoropolymer aqueous dispersion, the method including concentrating a composition comprising a polymer (I) containing a polymerization unit (I) derived from a monomer (I) represented by the general formula (I), a fluoropolymer excluding the polymer (I), a nonionic surfactant, a fluorine-free anionic surfactant, and an aqueous medium to thereby obtain an aqueous dispersion containing the fluoropolymer, CX1X3?CX2R(—CZ1Z2-A0)m??(I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

Abstract: A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant: (H—(CF2)m—COO)pM1; or??Formula (1): (H—(CF2)n—SO3)qM2.??Formula (2): Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition: (H—(CF2)8—SO3)qM2.

Abstract: It is an object of the present invention to provide polytetrafluoroethylene suitable for forming a porous polytetrafluoroethylene film using a high water-soluble surfactant with high volatility. Polytetrafluoroethylene has non-melt-secondary-processability, standard specific gravity of 2.160 or less, an average primary particle size of 150 nm or more, stress relaxation time of 500 seconds or more, and break strength of 29.7 N or more. The polytetrafluoroethylene is obtainable by emulsion polymerization of tetrafluoroethylene in the presence of a fluorinated surfactant with Log POW of 3.4 or less.

Abstract: Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having an average particle size of 1.0 to 50 ?m, and containing 30 or more carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

Abstract: A fluoropolymer composition production method for producing a fluoropolymer composition containing a fluoropolymer, the method which includes polymerizing a fluoromonomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium to prepare an aqueous dispersion comprising a fluoropolymer; feeding an inert gas to the reactor; and subjecting to a heat treatment the aqueous dispersion in the reactor to give a fluoropolymer composition, wherein a temperature of the heat treatment is 35° C. or higher and a time of the heat treatment is 15 minutes or more.

Abstract: Provided is a fluoropolymer composition production method for producing a fluoropolymer composition containing a fluoropolymer, the method which includes polymerizing a fluoromonomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium to prepare an aqueous dispersion containing a fluoropolymer; after the aqueous dispersion is prepared, removing from the reactor the fluoromonomer remaining in the reactor, or recovering the aqueous dispersion in the reactor and accommodating the aqueous dispersion in a container different from the reactor; adding a radical generator to the aqueous dispersion; and subjecting to a heat treatment the aqueous dispersion comprising the radical generator to give a fluoropolymer composition.

Abstract: A method for producing a fluoropolymer, which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1), the polymer (1) including a polymerized unit derived from a monomer CX2?CY(—CZ2—O—Rf-A), wherein X is the same or different and is —H or —F; Y is —H, —F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is —H, —F, an alkyl group, or a fluoroalkyl group; Rf is a C1-C40 fluorine-containing alkylene group or a C-C100 fluorine-containing alkylene group and having an ether bond; and A is —COOM, —SO3M, or —OSO3M, wherein M is —H, a metal atom, —NR74, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein R7 is H or an organic group, providing that at least one of X, Y, and Z contains a fluorine atom.

Abstract: A method for producing a polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a polymer (1) to obtain the polytetrafluoroethylene, wherein the polymer (1) is a polymer of a monomer (1) represented by the general formula (1): CF2?CF(—O—Rf-A), has a weight average molecular weight of 1.4×104 or more, wherein a content of a polymerization unit (1) based on the monomer (1) is 40 mol % or more based on all polymerization units constituting the polymer (1), and a content of a dimer and a trimer of the monomer (1) is 1.0% by mass or less based on the polymer (1).

Abstract: A method for producing a fluoropolymer, which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1), the polymer (1) including a polymerized unit derived from a monomer CX2?CY(—CZ2—O—Rf-A), wherein X is the same or different and is —H or —F; Y is —H, —F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is —H, —F, an alkyl group, or a fluoroalkyl group; Rf is a C1-C40 fluorine-containing alkylene group or a C—C100 fluorine-containing alkylene group and having an ether bond; and A is —COOM, —SO3M, or —OSO3M, wherein M is —H, a metal atom, —NR74, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein R7 is H or an organic group, providing that at least one of X, Y, and Z contains a fluorine atom.