Abstract: To provide an adhesive film comprising a polyimide film and a fluorinated resin layer directly laminated, in which blisters (foaming) in an atmosphere corresponding to reflow soldering at high temperature are suppressed, and a flexible metal laminate. An adhesive film having a fluorinated resin layer containing a fluorinated copolymer (A) directly laminated on one side or both sides of a polyimide film, wherein the fluorinated copolymer (A) has a melting point of at least 280° C. and at most 320° C., is melt-moldable, and has at least one type of functional groups selected from the group consisting of a carbonyl group-containing group, a hydroxy group, an epoxy group and an isocyanate group, and the fluorinated resin layer has a thickness of from 1 to 20 ?m.

Abstract: To provide an insulating tape for covering, in which a polyimide film and a fluorinated resin film are laminated with excellent adhesion, and a method for producing a structure, which comprises covering a conductor with such an insulating tape for covering, followed by thermal treatment. The insulating tape for covering, comprises a polyimide film and a fluorinated resin film directly laminated on one or both surfaces of the polyimide film, wherein the fluorinated resin film contains a fluorinated copolymer (A) which has a melting point of from 220 to 320° C. and can be melt-molded and which has at least one type of functional groups selected from the group consisting of carbonyl group-containing groups, hydroxy groups, epoxy groups and isocyanate groups.

Abstract: To provide a fluorinated elastomer composition which is excellent in flexibility, heat resistance and flame retardance, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition. A fluorinated elastomer composition comprising a tetrafluoroethylene/propylene copolymer (a), an ethylene/tetrafluoroethylene copolymer (b), an ethylene copolymer (c) containing epoxy groups and a flame retardant (d), wherein the mass ratio [(a)/(b)] of (a) to (b) is from 70/30 to 40/60, the mass ratio [(b)/(c)] of (b) to (c) is from 100/0.1 to 100/10, and the content of (d) is from 0.1 to 30 parts by mass per 100 parts by mass of the total content of (a), (b) and (c).

Abstract: To provide a fluorinated elastomer composition which is excellent in flexibility and oil resistance to lubricant oil such as automatic transmission oil, is less susceptible to heat discoloration and is excellent also in moldability, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition. A fluorinated elastomer composition comprising a tetrafluoroethylene/propylene copolymer (a), an ethylene/tetrafluoroethylene copolymer (b) and an ethylene copolymer (c) containing epoxy groups, wherein the mass ratio [(a)/(b)] of the tetrafluoroethylene/propylene copolymer (a) to the ethylene/tetrafluoroethylene copolymer (b) is from 70/30 to 40/60, and the mass ratio [(b)/(c)] of the ethylene/tetrafluoroethylene copolymer (b) to the ethylene copolymer (c) containing epoxy groups is from 100/0.1 to 100/10.

Abstract: A method of manufacturing a PTFE stretched film that has higher tensile strength at its breaking point. In the method, a resin composition is obtained by mixing an emulsion of PTFE (A) with a number average molecular weight of 5×106 or more and an emulsion of PTFE (B) with a number average molecular weight of 1×106 to 4×106 so that the solid content ratio (A/B) of the PTFE (A) and the PTFE (B) is 99/1 to 10/90. The mixed emulsion is subjected to compression molding in a melted state under a reduced-pressure atmosphere to obtain a film.

Abstract: To provide an adhesive film comprising a polyimide film and a fluorinated resin layer directly laminated, in which blisters (foaming) in an atmosphere corresponding to reflow soldering at high temperature are suppressed, and a flexible metal laminate. An adhesive film having a fluorinated resin layer containing a fluorinated copolymer (A) directly laminated on one side or both sides of a polyimide film, wherein the fluorinated copolymer (A) has a melting point of at least 280° C. and at most 320° C., is melt-moldable, and has at least one type of functional groups selected from the group consisting of a carbonyl group-containing group, a hydroxy group, an epoxy group and an isocyanate group, and the fluorinated resin layer has a thickness of from 1 to 20 ?m.

Abstract: To provide a fluorinated elastomer composition which is excellent in flexibility, heat resistance and flame retardance, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition. A fluorinated elastomer composition comprising a tetrafluoroethylene/propylene copolymer (a), an ethylene/tetrafluoroethylene copolymer (b), an ethylene copolymer (c) containing epoxy groups and a flame retardant (d), wherein the mass ratio [(a)/(b)] of (a) to (b) is from 70/30 to 40/60, the mass ratio [(b)/(c)] of (b) to (c) is from 100/0.1 to 100/10, and the content of (d) is from 0.1 to 30 parts by mass per 100 parts by mass of the total content of (a), (b) and (c).

Abstract: To produce a PTFE aqueous emulsion, whereby the environmental load is little, the stability of the aqueous emulsion is high, and a molded product having high heat resistance can be obtained. A process for producing a PTFE aqueous emulsion, which comprises emulsion-polymerizing tetrafluoroethylene (TFE) by means of at least one fluorinated emulsifier selected from the group consisting of a C4-8 fluorinated carboxylic acid having from 1 to 4 etheric oxygen atoms in its main chain, and its salts, to obtain an aqueous emulsion containing polytetrafluoroethylene (PTFE) microparticles having an average primary particle size of from 0.1 to 0.3 ?m, wherein at the beginning of the emulsion polymerization of TFE, a (polyfluoroalkyl)ethylene (a) represented by “CH2?CH—Rf1”, and/or a comonomer (b) having a monomer reactivity ratio rTFE of from 0.1 to 8 in copolymerization with tetrafluoroethylene, is incorporated to the emulsion polymerization system, so as to be from 0.001 to 0.

Abstract: To provide an insulating tape for covering, in which a polyimide film and a fluorinated resin film are laminated with excellent adhesion, and a method for producing a structure, which comprises covering a conductor with such an insulating tape for covering, followed by thermal treatment. The insulating tape for covering, comprises a polyimide film and a fluorinated resin film directly laminated on one or both surfaces of the polyimide film, wherein the fluorinated resin film contains a fluorinated copolymer (A) which has a melting point of from 220 to 320° C. and can be melt-molded and which has at least one type of functional groups selected from the group consisting of carbonyl group-containing groups, hydroxy groups, epoxy groups and isocyanate groups.

Abstract: To provide a fluorinated elastomer composition which can improve, in production of a fluorinated foamed rubber by foaming and crosslinking a fluorinated elastomer using an organic peroxide as a crosslinking agent, the foamed state and physical properties of the fluorinated foamed rubber. A fluorinated elastomer composition which comprises 100 parts by mass of a fluorinated elastomer, from 0.1 to 20 parts by mass of a blowing agent and from 0.05 to 10 parts by mass of a crosslinking agent comprising a peroxide compound, and which contains no crosslinking aid or contains a crosslinking aid comprising a compound having at least two carbon-carbon double bond-containing groups in the same molecule, in a content of at most 0.3 part by mass, is foamed and crosslinked to produce a fluorinated foamed rubber.

Abstract: To provide a fluorinated elastomer composition which is excellent in flexibility and oil resistance to lubricant oil such as automatic transmission oil, is less susceptible to heat discoloration and is excellent also in moldability, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition. A fluorinated elastomer composition comprising a tetrafluoroethylene/propylene copolymer (a), an ethylene/tetrafluoroethylene copolymer (b) and an ethylene copolymer (c) containing epoxy groups, wherein the mass ratio [(a)/(b)] of the tetrafluoroethylene/propylene copolymer (a) to the ethylene/tetrafluoroethylene copolymer (b) is from 70/30 to 40/60, and the mass ratio [(b)/(c)] of the ethylene/tetrafluoroethylene copolymer (b) to the ethylene copolymer (c) containing epoxy groups is from 100/0.1 to 100/10.

Abstract: To provide a fluorinated elastic copolymer having high crosslinkability, having high flowability and excellent in the compression set and the resistance to bases, and its production process. A process for producing a fluorinated elastic copolymer, which comprises copolymerizing (a) tetrafluoroethylene and (b) propylene and as the case requires, (c) a perfluoro(alkyl vinyl ether) in the presence of an iodine compound represented by the formula RI2 (wherein R is a hydrocarbon group or perfluoroalkyl group having at least 3 carbon atoms) at a temperature of from 0° C. to 50° C., and a fluorinated elastic copolymer obtained by the production process.

Abstract: To provide a fluorinated elastomer composition which can improve, in production of a fluorinated foamed rubber by foaming and crosslinking a fluorinated elastomer using an organic peroxide as a crosslinking agent, the foamed state and physical properties of the fluorinated foamed rubber. A fluorinated elastomer composition which comprises 100 parts by mass of a fluorinated elastomer, from 0.1 to 20 parts by mass of a blowing agent and from 0.05 to 10 parts by mass of a crosslinking agent comprising a peroxide compound, and which contains no crosslinking aid or contains a crosslinking aid comprising a compound having at least two carbon-carbon double bond-containing groups in the same molecule, in a content of at most 0.3 part by mass, is foamed and crosslinked to produce a fluorinated foamed rubber.

Abstract: To provide a method for producing a PTFE fine powder having a low paste extrusion pressure property by a simple method. The method for producing a PTFE fine power comprises emulsion polymerizing tetrafluoroethylene in the presence of an aqueous medium, a fluorinated surfactant and a radical polymerization initiator, to produce an aqueous PTFE emulsion, and coagulating it in the presence of at least one bulk density-reducing compound selected from the group consisting of ammonia, an ammonium salt and urea in an amount of from 0.4 to 10 parts by mass per 100 parts by mass of PTFE.

Abstract: To provide a method for recovering an anionic fluorinated emulsifier, capable of easily and efficiently recovering an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin. A basic ion exchange resin is brought into contact with a mixture of an aqueous inorganic acid solution and a non-aqueous fluorinated medium, or the basic ion exchange resin is brought into contact with an aqueous inorganic acid solution and then brought into contact with a non-aqueous fluorinated medium, then a phase of the non-aqueous fluorinated medium is recovered, and an acid of the anionic fluorinated emulsifier is recovered from the phase of the non-aqueous fluorinated medium.

Abstract: A method of manufacturing a PTFE stretched film that has higher tensile strength at its breaking point. In the method, a resin composition is obtained by mixing an emulsion of PTFE (A) with a number average molecular weight of 5×106 or more and an emulsion of PTFE (B) with a number average molecular weight of 1×106 to 4×106 so that the solid content ratio (A/B) of the PTFE (A) and the PTFE (B) is 99/1 to 10/90. The mixed emulsion is subjected to compression molding in a melted state under a reduced-pressure atmosphere to obtain a film.

Abstract: This invention provide an aqueous PTFE dispersion and a process for efficiently producing the aqueous PTFE dispersion for coagulation processing having excellent coagulation properties of PTFE microparticles. The process involves adding a synthetic adsorbent, having a specific surface area of from 100 to 2,000 m2/g, to an aqueous PTFE dispersion containing both PTFE microparticles, having an average particle size of from 0.10 to 0.50 ?m, and a nonionic surfactant, followed by stirring or shaking and then separation into a liquid phase and a solid phase, and recovering an aqueous PTFE dispersion which contains from 45 to 70 mass % of PTFE microparticles having an average particle size of from 0.10 to 0.50 ?m and from 1.4 to 2.1 mass %, based on the mass of the PTFE microparticles, of a nonionic surfactant.

Abstract: A polymerization medium having small ozone depletion potential and small global warming potential and having a small chain transfer constant is used, to efficiently produce a fluoropolymer having a high molecular weight and having excellent heat resistance, solvent resistance, chemical resistance, etc. A process for producing a fluoropolymer, which comprises polymerizing a fluoromonomer having a carboxylic acid type functional group and a fluoroolefin using a hydrofluorocarbon as a medium, wherein the hydrofluorocarbon as the medium has 4 to 10 carbon atoms and has a ratio (molar basis) of the number of hydrogen atoms/the number of fluorine atoms (H/F ratio) of from 0.05 to 20.

Abstract: To provide a method for recovering an anionic fluorinated emulsifier, capable of easily and efficiently recovering an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin. A basic ion exchange resin is brought into contact with a mixture of an aqueous inorganic acid solution and a non-aqueous fluorinated medium, or the basic ion exchange resin is brought into contact with an aqueous inorganic acid solution and then brought into contact with a non-aqueous fluorinated medium, then a phase of the non-aqueous fluorinated medium is recovered, and an acid of the anionic fluorinated emulsifier is recovered from the phase of the non-aqueous fluorinated medium.

Abstract: To produce a PTFE aqueous emulsion, whereby the environmental load is little, the stability of the aqueous emulsion is high, and a molded product having high heat resistance can be obtained. A process for producing a PTFE aqueous emulsion, which comprises emulsion-polymerizing tetrafluoroethylene (TFE) by means of at least one fluorinated emulsifier selected from the group consisting of a C4-8 fluorinated carboxylic acid having from 1 to 4 etheric oxygen atoms in its main chain, and its salts, to obtain an aqueous emulsion containing polytetrafluoroethylene (PTFE) microparticles having an average primary particle size of from 0.1 to 0.3 ?m, wherein at the beginning of the emulsion polymerization of TFE, a (polyfluoroalkyl)ethylene (a) represented by “CH2?CH—Rf1”, and/or a comonomer (b) having a monomer reactivity ratio rTFE of from 0.1 to 8 in copolymerization with tetrafluoroethylene, is incorporated to the emulsion polymerization system, so as to be from 0.001 to 0.