Abstract: To obtain a nonwoven fabric which is excellent in the heat resistance and the chemical resistance, of which the fiber diameter is small, and which is excellent in the mechanical strength at a temperature at which it is used; and an electrolyte membrane which is excellent in the dimensional stability when it is swollen by water, and of which an increase in the resistance by a reinforcing material is suppressed. A nonwoven fabric 28 containing fibers 26 of an ethylene/tetrafluoroethylene copolymer having a storage elastic modulus E? at 25° C. of at least 8×108 Pa and a melt viscosity measured at 300° C. of higher than 60 Pa·s and at most 300 Pa·s, wherein the average fiber diameter of the fibers is from 0.01 to 3 ?m; and an electrolyte membrane reinforced by the nonwoven fabric 28.

Abstract: To provide a method for producing ETFE granules having a low content of an ethylene/tetrafluoroethylene copolymer oligomer and being excellent in handling efficiency. A method for granulating an ethylene/tetrafluoroethylene copolymer, which is characterized by stirring and granulating a slurry of an ethylene/tetrafluoroethylene copolymer together with water in the presence of both ethylene and tetrafluoroethylene at a granulation temperature of from 10 to 130° C. for a granulation time of from 30 to 240 minutes.

Abstract: To provide a method for purifying tetrafluoroethylene by removing, from tetrafluoroethylene containing a polymerization inhibitor, the polymerization inhibitor by adsorption. A method of bringing tetrafluoroethylene containing a polymerization inhibitor into contact with a silica gel containing a metal salt in an amount of from 250 to 100,000 mass ppm as calculated as metal atoms to remove the polymerization inhibitor by adsorption, and the metal salt is preferably a salt of a metal of Group 3 to 13 of the Periodic Table, more preferably a salt of a metal of Group 8 to 10 of the Periodic Table. For example, as the metal salt, a salt of at least one metal selected from the group consisting of iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum may be used.

Abstract: The present invention provides an ethylene/tetrafluoroethylene copolymer composition having a high melt flowability while maintaining satisfactory mechanical properties in the obtainable molded product are maintained. The ethylene/tetrafluoroethylene copolymer composition (C) has a melt viscosity of from 80 to 500 Pa·s, preferably from 100 to 300 Pa·s and a tensile elongation of from 200 to 500%, preferably from 350 to 450%. The copolymer composition (C) is may be obtained by melt kneading an ethylene/tetrafluoroethylene copolymer (A) having a low melt viscosity of from 60 to 400 Pa·s, preferably from 80 to 300 Pa·s and an ethylene/tetrafluoroethylene copolymer (B) having a melt viscosity higher than this i.e. from 600 to 10,000 Pa·s, preferably from 1,000 to 7,000 Pa·s in a mass ratio of (A)/(B)=50/50 to 99/1, preferably (A)/(B)=60/40 to 97/3.

Abstract: To provide an ethylene/tetrafluoroethylene copolymer excellent in the thermal resistance, and a method for its production. The ethylene/tetrafluoroethylene copolymer is produced by polymerizing ethylene with tetrafluoroethylene in an organic solvent containing no chlorine atoms as a polymerization medium, in the presence of a chain transfer agent containing no chlorine atoms and a polymerization initiator containing no chlorine atoms, and further in the substantial absence of a chain transferable compound having a carbon-chlorine atomic bond in the reaction system.

Abstract: To provide an electrolyte membrane having excellent dimensional stability even upon absorption of water, a high proton conductance and high power generation performance; and a process for producing the electrolyte membrane with a high productivity. An electrolyte membrane for polymer electrolyte fuel cells, which is made mainly of an ion exchange resin and reinforced with a nonwoven fabric made of fiber of a fluororesin wherein at least some of intersecting points of the fiber are fixed, and which has, as the outermost layer on one side or each side, a layer not reinforced, made of an ion exchange resin which may be the same as or different from the above ion exchange resin, wherein the fluororesin is an ethylene/tetrafluoroethylene copolymer having a melting point of at most 240° C., and the above fixing is fixing by fusion of the fiber.

Abstract: A packaging container having a chromatic color ink layer which is formed in a light-blocking printed layer (3), wherein a chromatic color ink applied to the chromatic color ink layer contains a white color family pigment and a black color family pigment and the contents of said black color family pigment amount to 3 to 5 parts by weight per 100 parts by weight of the total amount of the pigments in the chromatic color ink. The packaging container retains appropriate opacifying properties and light-blocking properties and provides no metallic residue when incinerated.

Abstract: To provide a multilayer laminate excellent in fuel barrier properties, fuel oil resistance, mechanical strength and interlaminar adhesion strength. A multilayer laminate having a layer of a fluororesin containing acid anhydride residue (for example, a tetrafluoroethylene/ethylene/(perfluoroethyl)ethylene/itaconic anhydride copolymer) and a layer of an amine-modified thermoplastic resin (for example, polyphenylene sulfide modified by a silane coupling agent containing an amino group). The multilayer laminate can be produced by co-extrusion and is excellent in the interlaminar adhesion strength, whereby it is suitable for a fuel hose or the like.

Abstract: A multilayer laminate containing a laminate (I)/(II) that is formed by directly bonding a layer (I) made of a fluororesin (A) having a functional group (a), said fluororesin (A) being an ethylene/tetrafluoroethylene/hexafluoropropylene/CH2?CH—Rf, wherein Rf copolymer is a C2-6 perfluoroalkyl group, and in the copolymer, the molar ratio of repeating units based on ethylene/repeating units based on tetrafluoroethylene/repeating units based on hexafluoropropylene/repeating units based on CH2? CH—Rf ranges from 40/47/10/3 to 46.9/46.9/6/0.2 and a layer (II) made of a thermoplastic resin (B) having a functional group (b) that is capable of forming a chemical bond by reacting with the functional group (a) of the fluororesin, wherein the fluororesin (A) has a melting point ranging from 120 to 230° C.

Abstract: A fluorocopolymer and film thereof exhibiting excellent transparency and mechanical strength at ambient and elevated temperatures, wherein the fluorocopolymer includes polymerized units based on ethylene (E), tetrafluoroethylene (TFE), hexafluoropropylene (HFP) and perfluoro(alkyl vinyl ether) (PFAV), wherein the molar ratio of polymerized units based on E/TFE is from 10/90 to 60/40, the content of polymerized units based on HFP is from 0.2 to 0.9 mol % based on the total number of polymerized units, and the content of polymerized units based on PFAV is from 0.1 to 1.0 mol % based on the total number of polymerized units.

Abstract: A multilayer laminate containing a laminate (I)/(II) formed by directly bonding by means of thermal lamination or the like, a layer (I) made of a fluororesin (A) with a functional group (a) and a layer (II) made of a thermoplastic resin (B) with a functional group (b) capable of forming a chemical bond by reacting with the functional group (a) of the fluororesin, wherein the fluororesin (A) has a low melting point of from 120 to 230° C. The laminate may, for example, be a multiplayer laminate containing a layer obtained by directly laminating a layer (I) made of a fluororesin (A) containing an acid anhydride residue (for example, a tetrafluoroethylene/ethylene/hexafluoropropylene/(perfluorobutyl)ethylene)/itaconic anhydride copolymer) and a layer (II) made of an amine-modified thermoplastic resin (B) (for example, a polyurethane modified with a silane coupling agent containing an amino group). The laminate is excellent in interlayer adhesion and productivity.

Abstract: A fluorocopolymer film formed by molding at a molding temperature of at most 320° C. a fluorocopolymer comprising repeating units based on ethylene, repeating units based on tetrafluoroethylene, repeating units based on hexafluoropropylene and repeating units based on a fluoroalkyl vinyl ether represented by CF2?CFORf (wherein Rf represents a C1-10 fluoroalkyl group), having a molar ratio of the repeating units based on ethylene/the repeating units based on tetrafluoroethylene of from 10/90 to 60/40, a content of the repeating units based on hexafluoropropylene to the total repeating units of from 0.1 to 20 mol % and a content of the fluoroalkyl vinyl ether to the total repeating units of from 0.1 to 10 mol %, and having a volumetric flow rate of from 0.1 to 30 mm3/sec at 297° C.

Abstract: To provide an ethylene/tetrafluoroethylene copolymer composition having a high melt flowability while the mechanical properties of the obtainable molded product are maintained. The ethylene/tetrafluoroethylene copolymer composition (C) has a melt viscosity of from 80 to 500 Pa·s, preferably from 100 to 300 Pa·s and a tensile elongation of from 200 to 500%, preferably from 350 to 450%. The copolymer composition (C) is obtainable by melt kneading an ethylene/tetrafluoroethylene copolymer (A) having a low melt viscosity of from 60 to 400 Pa·s, preferably from 80 to 300 Pa·s and an ethylene/tetrafluoroethylene copolymer (B) having a melt viscosity higher than this i.e. from 600 to 10,000 Pa·s, preferably from 1,000 to 7,000 Pa·s in a mass ratio of (A)/(B)=50/50 to 99/1, preferably (A)/(B)=60/40 to 97/3.

Abstract: To provide a multilayer laminate excellent in fuel barrier properties, fuel oil resistance, mechanical strength and interlaminar adhesion strength. A multilayer laminate having a layer of a fluororesin containing acid anhydride residue (for example, a tetrafluoroethylene/ethylene/(perfluoroethyl)ethylene/itaconic anhydride copolymer) and a layer of an amine-modified thermoplastic resin (for example, polyphenylene sulfide modified by a silane coupling agent containing an amino group). The multilayer laminate can be produced by co-extrusion and is excellent in the interlaminar adhesion strength, whereby it is suitable for a fuel hose or the like.

Abstract: A fluorocopolymer which comprises repeating units (a) based on tetrafluoroethylene and/or chlorotrifluoroethylene, repeating units (b) based on a cyclic hydrocarbon monomer having a dicarboxylic anhydride group and an endocyclic polymerizable unsaturated group, and repeating units (c) based on other monomer, wherein the repeating units (a) are from 50 to 99.89 mol %, the repeating units (b) are from 0.01 to 5 mol % and the repeating units (c) are from 0.1 to 49.99 mol %, based on the total molar amount of the repeating units (a), (b) and (c), and which has a volume flow rate of from 0.1 to 1,000 mm3/sec., and a laminate and coated product thereof. The fluorocopolymer is excellent in adhesion, heat resistance, weather resistance, stress cracking resistance and fuel barrier properties. The laminate is excellent in interlaminar bonding and fuel barrier properties.

Abstract: (OBJECT) To provide a fluorocopolymer excellent in transparency and excellent in mechanical strength at room temperature and at high temperature, and a film made of it. (MEANS TO ACHIEVE THE OBJECT) A fluorocopolymer comprising polymerized units based on ethylene, polymerized units based on tetrafluoroethylene, polymerized units based on hexafluoropropylene and polymerized units based on a perfluoro(alkyl vinyl ether), characterized in that the molar ratio of polymerized units based on ethylene/polymerized units based on tetrafluoroethylene is from 10/90 to 60/40, the content of the polymerized units based on hexafluoropropylene is from 0.1 to 1.0 mol % based on the total polymerized units, and the content of the polymerized units based on a perfluoro(alkyl vinyl ether) is from 0.1 to 1.0 mol % based on the total polymerized units.

Abstract: A fluorocopolymer which comprises repeating units (a) based on tetrafluoroethylene and/or chlorotrifluoroethylene, repeating units (b) based on a cyclic hydrocarbon monomer having a dicarboxylic anhydride group and an endocyclic polymerizable unsaturated group, and repeating units (c) based on other monomer, wherein the repeating units (a) are from 50 to 99.89 mol %, the repeating units (b) are from 0.01 to 5 mol % and the repeating units (c) are from 0.1 to 49.99 mol %, based on the total molar amount of the repeating units (a), (b) and (c), and which has a volume flow rate of from 0.1 to 1,000 mm3/sec., and a laminate and coated product thereof. The fluorocopolymer is excellent in adhesion, heat resistance, weather resistance, stress cracking resistance and fuel barrier properties. The laminate is excellent in interlaminar bonding and fuel barrier properties.

Abstract: A tetrafluoroethylene/ethylene copolymer composition comprising a tetrafluoroethylene/ethylene copolymer (A) and a thermoplastic fluoropolymer (B) having a crystallization temperature higher than the crystallization temperature of said tetrafluoroethylene/ethylene copolymer (A) in a mass ratio of (A)/(B)=from 99.8/0.2 to 1/99. The composition is excellent in melt processability, and its formed product is excellent in mechanical properties and fuel barrier properties.

Abstract: A packaging container having a chromatic color ink layer which is formed in a light-blocking printed layer (3), wherein a chromatic color ink applied to the chromatic color ink layer contains a white color family pigment and a black color family pigment and the contents of said black color family pigment amount to 3 to 5 parts by weight per 100 parts by weight of the total amount of the pigments in the chromatic color ink. The packaging container retains appropriate opacifying properties and light-blocking properties and provides no metallic residue when incinerated.

Abstract: A fluorocopolymer film formed by molding at a molding temperature of at most 320° C. a fluorocopolymer comprising repeating units based on ethylene, repeating units based on tetrafluoroethylene, repeating units based on hexafluoropropylene and repeating units based on a fluoroalkyl vinyl ether represented by CF2?CFORf (wherein Rf represents a C1-10 fluoroalkyl group), having a molar ratio of the repeating units based on ethylene/the repeating units based on tetrafluoroethylene of from 10/90 to 60/40, a content of the repeating units based on hexafluoropropylene to the total repeating units of from 0.1 to 20 mol % and a content of the fluoroalkyl vinyl ether to the total repeating units of from 0.1 to 10 mol %, and having a volumetric flow rate of from 0.1 to 30 mm3/sec at 297° C.