Abstract: Provided is a porous membrane including polytetrafluoroethylene and/or modified polytetrafluoroethylene having a small pore diameter, thin film thickness, high porosity, and high strength; and a method for manufacturing the same. The porous membrane including polytetrafluoroethylene and/or modified polytetrafluoroethylenehas bubble point of isopropyl alcohol according to JIS K3832 of 600 kPa or more, and tensile strength according to JIS K6251 of 90 MPa or more.

Abstract: The problem of the present invention is to provide a novel polytetrafluoroethylene porous film having a small pore diameter, small film thickness, high porosity, and high strength, and a production method thereof. The present invention provides a polytetrafluoroethylene porous film, wherein a bubble point in isopropyl alcohol (IPA) according to JIS K3832 is not less than 400 kPa, and a tensile strength based on JIS K6251 is not less than 50 MPa.

Abstract: A composition for dust-preventive treatment including an aqueous dispersion of fluorine-containing polymer showing a low potential for environmental concerns and a dust prevention effect as high as that of known composition for dust-preventive treatment. The composition for dust-preventive treatment includes an aqueous dispersion of fluorine-containing polymer containing 50 ppm or less of a fluorine-containing emulsifier. The composition for dust-preventive treatment comprising aqueous dispersion of fluorine-containing polymer containing 50 ppm or less of a fluorine-containing emulsifier can preferably be obtained by removing the fluorine-containing emulsifier from a polymer dispersion prepared by polymerizing tetrafluoroethylene using the fluorine-containing emulsifier.

Abstract: A method for dusting-preventive treatment of a dusting material using a dust-preventive treatment agent including a PTFE aqueous dispersion having lower potential for environmental concerns, which method is as effective as a known method and further has a lower possibility of environmental concerns, and the dust-preventive treated material obtained by treating the dusting material by the method. The method involves mixing a dust preventing treatment composition composed of an aqueous dispersion of polytetrafluoroethylene containing 50 ppm or less of a fluorine-containing emulsifier with the dusting material and then forming fibrils of polytetrafluoroethylene by applying a compression/shear force to the mixture above at a temperature of about 20° C. to 200° C.

Abstract: A composition comprising an aqueous dispersion of fluoropolymer particles stabilized with a polyoxyethylene alkyl ether surfactant having a polydispersity index, Mw/Mn, of 1.15 or less, useful in compositions comprising electrode material.

Abstract: A method for dusting-preventive treatment of a dusting material using a dust-preventive treatment agent including a PTFE aqueous dispersion having lower potential for environmental concerns, which method is as effective as a known method and further has a lower possibility of environmental concerns, and the dust-preventive treated material obtained by treating the dusting material by the method. The method involves mixing a dust preventing treatment composition composed of an aqueous dispersion of polytetrafluoroethylene containing 50 ppm or less of a fluorine-containing emulsifier with the dusting material and then forming fibrils of polytetrafluoroethylene by applying a compression/shear force to the mixture above at a temperature of about 20° C. to 200° C.

Abstract: A composition for dust-preventive treatment including an aqueous dispersion of fluorine-containing polymer showing a low potential for environmental concerns and a dust prevention effect as high as that of known composition for dust-preventive treatment. The composition for dust-preventive treatment includes an aqueous dispersion of fluorine-containing polymer containing 50 ppm or less of a fluorine-containing emulsifier. The composition for dust-preventive treatment comprising aqueous dispersion of fluorine-containing polymer containing 50 ppm or less of a fluorine-containing emulsifier can preferably be obtained by removing the fluorine-containing emulsifier from a polymer dispersion prepared by polymerizing tetrafluoroethylene using the fluorine-containing emulsifier.

Abstract: The present invention is directed to a binder for electrode materials which comprises tetrafluoroethylene polymer fine particles having an average particle size of not more than about 0.20 ?m and having a standard specific gravity of not more than about 2.20, wherein a mixture prepared from said fine particles with about 17% by weight of the total mixture of an extrusion coagent, when subjected to the measurement of an extrusion pressure by a rheometer, exhibits under the conditions of a draw ratio of 100 to 1 and an extrusion speed of 18±2 mm/min, an extrusion pressure of not less than about 220 kg/cm2.

Abstract: A fluoropolymer-coated conductor, in which a central conductor is coated with a mixture of at least two fluoropolymers, each having different melting points, one of which is polymers is PTFE, a coaxial cable using the coated conductor, and a method for producing a fluoropolymer-coated conductor in which a central conductor is coated with a mixture obtained by mixing at least two kinds of fluoropolymers, each having different melting points, one of which polymers is PTFE, and heating these at a temperature above the melting point of the lowest melting fluoropolymer and below the melting point of the highest melting fluoropolymer.

Abstract: A composition comprising an aqueous dispersion of fluoropolymer particles stabilized with a polyoxyethylene alkyl ether surfactant having a polydispersity index, Mw/Mn, of 1.15 or less, useful in compositions comprising electrode material.

Abstract: An aqueous dispersion composition of about 30 to about 70 weight % non-melt-processible fluoropolymer particles having a standard specific gravity (SSG) of less than 2.225 and about 2 to about 11 weight % surfactant based on the weight of said fluoropolymer comprising a compound or mixture of compounds of the formula: R(OCH2CH2)nOH wherein R is a branched alkyl, branched alkenyl, cycloalkyl, or cycloalkenyl hydrocarbon group having 8-18 carbon atoms and n is an average value of 5 to 18. The fluoropolymer particles of the dispersion comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. Preferably, the aqueous dispersion composition comprises about 45 to about 65 weight % non-melt-processible fluoropolymer particles.

Abstract: The present invention is directed to a binder for electrode materials which comprises tetrafluoroethylene polymer fine particles having an average particle size of not more than about 0.20 ?m and having a standard specific gravity of not more than about 2.20, wherein a mixture prepared from said fine particles with about 17% by weight of the total mixture of an extrusion coagent, when subjected to the measurement of an extrusion pressure by a rheometer, exhibits under the conditions of a draw ratio of 100 to 1 and an extrusion speed of 18±2 mm/min, an extrusion pressure of not less than about 220 kg/cm2.

Abstract: An aqueous dispersion composition of about 30 to about 70 weight % non-melt-processible fluoropolymer particles having a standard specific gravity (SSG) of less than 2.

Abstract: Polymerization of tetrafluoroethylene is carried out in an aqueous medium to manufacture a type of modified polytetrafluoroethylene fine powder, containing perfluorobutyl ethylene and hexafluoropropylene, with excellent extrusion property under a high reduction ration and with high thermal stability.

Abstract: A process for separating the ammonium salt of a selected fluoroalkanoic acid and a selected hydrocarbyl oxyethoxylatedpolyether from aqueous dross liquor which comprises:A. extracting the ammonium salt (in the form of its corresponding acid) and the ethoxylated compound from an acidified aqueous dross liquor by agitating with a selected organic liquid and separating the organic liquid layer,B. (1) contacting said organic liquid layer with activated alumina,(2) washing and drying the alumina and contacting it with ammonium hydroxide,C. boiling the organic liquid obtained in step B1 until the ethoxylated compound remains.