Abstract: To provide a fluorinated copolymer composition capable of forming a crosslinked rubber having favorable rubber properties and excellent metal adhesion, and a metal rubber laminate using the crosslinked rubber. A fluorinated copolymer composition comprising a copolymer having units based on tetrafluoroethylene and units based on propylene, a copolymer having units based on tetrafluoroethylene and units based on a perfluoro(alkyl vinyl ether), or a copolymer having units based on hexafluoropropylene and units based on vinylidene fluoride, hydrophilic silica, and an acid acceptor.

Abstract: The present invention provides pitch-based ultrafine carbon fibers containing nitrogen atoms, wherein the average fiber diameter is more than 100 nm but not more than 900 nm; the content of the nitrogen atoms as determined by X-ray photoelectron spectroscopy (XPS) is 1.00% by atom or less; and the true density is from 1.95 to 2.20 g/cm3.

Abstract: To provide a laminate excellent in alkali resistance and interlaminar strength at high temperature, and a process for producing the laminate. A process for producing a laminate, comprising producing a non-crosslinked laminate having a layer of a first composition containing a copolymer having fluorine atoms and a layer of a second composition containing a non-fluorinated elastic polymer, and crosslinking the first composition and the second composition to produce a laminate having a first layer formed of a crosslinked product of the first composition and a second layer formed of a crosslinked product of the second composition, wherein when the first composition and the second composition contains a common crosslinking aid, the absolute value of the crosslinking rate difference between the first composition and the second composition is at most 0.30.

Abstract: To provide a fluorinated elastic copolymer excellent in adhesion, processability, mechanical properties, heat resistance and chemical resistance. A fluorinated elastic copolymer having units based on a monomer (a), units based on a monomer (b) and optionally units based on a monomer (c), which has an iodine atom bonded to a terminal of a molecular chain and the unit based on the monomer (b) adjacent to the iodine atom, and which has a proportion of the units based on the monomer (b) of from 0.09 to 2.0 mol % to all units. Monomer (a): monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene, a perfluoro(alkyl vinyl ether) and 2,3,3,3-tetrafluoropropene; monomer (b): a monomer having at least one type of functional group selected from the group consisting of an epoxy group, a hydroxy group, a carbonyl group-containing group and an isocyanate group; monomer (c): a monomer selected from the group consisting of ethylene and propylene.

Abstract: To provide a laminate excellent in alkali resistance and interlaminate bonding at high temperature, and a laminate. A method for producing a laminate, which comprises producing a laminate having a layer of a first composition containing a copolymer having fluorine atoms and a layer of a second composition containing a non-fluorinated polymer; and reacting the first composition and the second composition to produce a laminate having a first crosslinked layer formed of the first composition and a second crosslinked layer formed of a crosslinked product of the second composition, wherein the absolute value of the difference between the SP value of the first composition and the SP value of the second composition is from 0 to 3.0 (J/cm3)1/2.

Abstract: A slit device including a first transport section which transports a web in a transport direction while nipping the web, a second transport section which is disposed in parallel with a direction intersecting the transport direction of the first transport section and which transports the web in the transport direction while nipping the web, and a cutting section which is disposed between the first transport section and the second transport section in a direction intersecting the transport direction and which cuts the web along the transport direction, in which a cutting position at which the web is cut by the cutting section is a position within a nipping area where the first transport section nips the web along the transport direction, or is a position downstream of the nipping area in the transport direction.

Abstract: To provide a method for producing crosslinked rubber excellent in tensile strength and transparency. The method for producing crosslinked rubber of the present invention is a method for producing crosslinked rubber, which comprises crosslinking a fluorinated copolymer in a composition containing the fluorinated copolymer, a crosslinking agent, a crosslinking co-agent and an acid acceptor, wherein the fluorinated copolymer is a copolymer having units based on tetrafluoroethylene and units based on propylene, in the composition, the content of the crosslinking agent is from 0.03 to 1.5 parts by mass to 100 parts by mass of the fluorinated copolymer, the content of the crosslinking co-agent is from 0.1 to 3.5 parts by mass to 100 parts by mass of the fluorinated copolymer, and the total light transmittance of the crosslinked rubber is from 60 to 100%.

Abstract: Crosslinked rubber of the present invention is a crosslinked product of a copolymer having units based on tetrafluoroethylene and units based on propylene, of which the total light transmittance is from 60 to 100%. Or, crosslinked rubber of the present invention is a crosslinked product of a copolymer having units based on tetrafluoroethylene and units based on a perfluoro(alkyl vinyl ether), of which the total light transmittance is from 70 to 100%.

Abstract: A slit device including a first transport section which transports a web in a transport direction while nipping the web, a second transport section which is disposed in parallel with a direction intersecting the transport direction of the first transport section and which transports the web in the transport direction while nipping the web, and a cutting section which is disposed between the first transport section and the second transport section in a direction intersecting the transport direction and which cuts the web along the transport direction, in which a cutting position at which the web is cut by the cutting section is a position within a nipping area where the first transport section nips the web along the transport direction, or is a position downstream of the nipping area in the transport direction.

Abstract: To provide a fluorinated elastic copolymer capable of obtaining a crosslinked rubber which is excellent in tensile strength and has a low compression set under high temperature conditions; a method for producing such a fluorinated elastic copolymer; a crosslinked rubber; and a method for producing such a crosslinked rubber. A fluorinated elastic copolymer having structural units based, respectively, on monomers (a), (b) and (c), and further having iodine atoms. Monomer (a): at least one member selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene and perfluoro(alkyl vinyl ether). Monomer (b): at least one member selected from the group consisting of compounds represented by formula (I): CR1R2?CR3—R4—CR5?CR6R7 (I) (wherein R1, R2, R3, R5, R6 and R7 are each independently a hydrogen atom, a fluorine atom or a methyl group; and R4 is a C1-10 perfluoroalkylene group which may have an etheric oxygen atom inserted between carbon atoms).

Abstract: To provide a fluorinated elastic copolymer excellent in adhesion, processability, mechanical properties, heat resistance and chemical resistance. A fluorinated elastic copolymer having units based on a monomer (a), units based on a monomer (b) and optionally units based on a monomer (c), which has an iodine atom bonded to a terminal of a molecular chain and the unit based on the monomer (b) adjacent to the iodine atom, and which has a proportion of the units based on the monomer (b) of from 0.09 to 2.0 mol % to all units. Monomer (a): monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene, a perfluoro(alkyl vinyl ether) and 2,3,3,3-tetrafluoropropene; monomer (b): a monomer having at least one type of functional group selected from the group consisting of an epoxy group, a hydroxy group, a carbonyl group-containing group and an isocyanate group; monomer (c): a monomer selected from the group consisting of ethylene and propylene.

Abstract: To provide a fluorinated copolymer composition capable of forming a crosslinked rubber having favorable rubber properties and excellent metal adhesion, and a metal rubber laminate using the crosslinked rubber. A fluorinated copolymer composition comprising a copolymer having units based on tetrafluoroethylene and units based on propylene, a copolymer having units based on tetrafluoroethylene and units based on a perfluoro(alkyl vinyl ether), or a copolymer having units based on hexafluoropropylene and units based on vinylidene fluoride, hydrophilic silica, and an acid acceptor.

Abstract: To provide a laminate excellent in alkali resistance and interlaminar strength at high temperature, and a process for producing the laminate. A process for producing a laminate, comprising producing a non-crosslinked laminate having a layer of a first composition containing a copolymer having fluorine atoms and a layer of a second composition containing a non-fluorinated elastic polymer, and crosslinking the first composition and the second composition to produce a laminate having a first layer formed of a crosslinked product of the first composition and a second layer formed of a crosslinked product of the second composition, wherein when the first composition and the second composition contains a common crosslinking aid, the absolute value of the crosslinking rate difference between the first composition and the second composition is at most 0.30.

Abstract: To provide a crosslinkable composition containing a fluorinated copolymer, which is excellent in crosslinkability and gives a crosslinked product being capable of suppressing production of particles upon plasma irradiation, a crosslinked product obtained by crosslinking the composition, and a sealing material for a semiconductor production equipment, containing the crosslinked product. A crosslinkable composition comprising; a copolymer (X) having an iodine atom and also having structural units based on tetrafluoroethylene and structural units based on propylene, wherein the content of structural units based on vinylidene fluoride is less than 0.1 mol % in all of the structural units; an organic peroxide; a crosslinking aid; and at least one member selected from the group consisting of a quaternary ammonium salt, a quaternary phosphonium salt and an organic amine, wherein the metal element content is less than 1 part by mass based on 100 parts by mass of the copolymer (X).

Abstract: A fluororesin excellent in radiation resistance is provided. A fluororesin composed of a tetrafluoroethylene/ethylene copolymer which is a bipolymer of tetrafluoroethylene and ethylene containing units derived from tetrafluoroethylene in a proportion of from 50 to 60 mol % relative to the total of the units derived from tetrafluoroethylene and units derived from ethylene, wherein the melt flow rate measured at a temperature of 297° C. under a load of 49 N in accordance with ASTM D3159 is 0.1 g/10 min or less.

Abstract: To provide a fluororubber molded article which is inexpensive and excellent in fuel barrier properties against an alcohol-containing fuel. A fluororubber molded article obtained by molding and crosslinking a cross-linkable composition comprising a fluoroelastomer (A) and a fluoroelastomer (B), wherein the fluoroelastomer (A) is a copolymer comprising tetrafluoroethylene units and perfluorovinyl ether units represented by CF2?CF—O—Rf (Rf is a C1-20 perfluoroalkyl group or a C2-20 perfluoroalkyl group having an etheric oxygen atom between carbon atoms), the fluoroelastomer (B) is a copolymer comprising tetrafluoroethylene units, propylene units and vinylidene fluoride units, and the mass ratio of (A)/(B) is from 99/1 to 30/70.

Abstract: To provide a fluorinated elastic copolymer capable of obtaining a crosslinked rubber which is excellent in tensile strength and has a low compression set under high temperature conditions; a method for producing such a fluorinated elastic copolymer; a crosslinked rubber; and a method for producing such a crosslinked rubber. A fluorinated elastic copolymer having structural units based, respectively, on monomers (a), (b) and (c), and further having iodine atoms. Monomer (a): at least one member selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene and perfluoro(alkyl vinyl ether). Monomer (b): at least one member selected from the group consisting of compounds represented by formula (I): CR1R2?CR3—R4—CR5?CR6R7 (I) (wherein R1, R2, R3, R5, R6 and R7 are each independently a hydrogen atom, a fluorine atom or a methyl group; and R4 is a C1-10 perfluoroalkylene group which may have an etheric oxygen atom inserted between carbon atoms).

Abstract: To provide a polymerization initiator composition for a fluorinated polymer which will not destroy ozone layer and which has less influence over polymerization of a monomer for a fluorinated polymer, and a method for producing a fluorinated polymer by which a fluorinated polymer having a sufficient molecular weight can be obtained. An initiator composition for a fluorinated polymer, which comprises an organic peroxide, and a saturated hydrocarbon compound having at least one tertiary or quaternary carbon atom, and a method for producing a fluorinated polymer using the polymerization initiator composition, and a polymerization method comprising a step of recovering a polymerization solvent and a step of separating the saturated hydrocarbon compound from the recovered polymerization solvent.

Abstract: To provide a fluorinated elastomer from which it is possible to produce a crosslinked article excellent in cold resistance and excellent in mechanical strength; a fluorinated elastomer composition containing said elastomer; and a fluorinated elastomer crosslinked article obtained by molding and crosslinking said composition. The fluorinated elastomer comprises units (A) based on vinylidene fluoride and units (B) based on a perfluorovinyl ether represented by CF2?CF—O—Rf, and has iodine atoms at main chain terminals, wherein the molar ratio [(A)/(B)] of units (A) to units (B) is from 88/12 to 50/50. In the formula, Rf is a C1-20 perfluoroalkyl group having a branched structure, or a C2-20 perfluoroalkyl group having a branched structure and also having an etheric oxygen atom between carbon atoms.

Abstract: To provide a fluororubber molded article which is inexpensive and excellent in fuel barrier properties against an alcohol-containing fuel. A fluororubber molded article obtained by molding and crosslinking a cross-linkable composition comprising a fluoroelastomer (A) and a fluoroelastomer (B), wherein the fluoroelastomer (A) is a copolymer comprising tetrafluoroethylene units and perfluorovinyl ether units represented by CF2?CF—O—Rf (Rf is a C1-20 perfluoroalkyl group or a C2-20 perfluoroalkyl group having an etheric oxygen atom between carbon atoms), the fluoroelastomer (B) is a copolymer comprising tetrafluoroethylene units, propylene units and vinylidene fluoride units, and the mass ratio of (A)/(B) is from 99/1 to 30/70.