Abstract: Provided is a fluoroelastomer crosslinkable composition, containing a polyol-crosslinkable fluoroelastomer (a) and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the general formula (b) set forth in the description and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound.

Abstract: Provided is a fluoroelastomer crosslinkable composition containing: a polyol-crosslinkable fluoroelastomer (a); and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the following general formula (b) and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound. (wherein all symbols are as defined in the specification).

Abstract: A fluoroelastomer crosslinkable composition containing: a polyol-crosslinkable fluoroelastomer (a); and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from a compound that has a structure represented by the following general formula (b) in its molecule and that does not contain a fluorine atom, and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound: wherein all symbols are as defined in the specification. Also disclosed are a formed article and sealing material obtained from the fluoroelastomer crosslinkable composition.

Abstract: A fluoroelastomer crosslinkable composition including a fluoroelastomer (a) and a cross-linking agent (b). The cross-linking agent (b) is a compound (b1) represented by the general formula (b1) or the like.

Abstract: A fluoroelastomer crosslinkable composition containing a polyol-crosslinkable fluoroelastomer (a) and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from a compound represented by the general formula (b1) set forth in the description, a compound represented by the general formula (b2) set forth in the description, and a salt of any of these compounds with an alkali metal, an alkaline earth metal, or an onium compound. Also disclosed are a formed article and sealing material obtained from the fluoroelastomer crosslinkable composition.

Abstract: A fluoroelastomer crosslinkable composition including a polyol-crosslinkable fluoroelastomer (a) and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from a compound represented by the following general formula (b) and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound: wherein respective symbols are the same as those defined in the specification. Also disclosed are a formed article and sealing material obtained from the fluoroelastomer crosslinkable composition.

Abstract: The present disclosure provides a fluoroelastomer crosslinkable composition, the composition containing (a) a polyol-crosslinkable fluoroelastomer and (b) a cross-linking agent, wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the general formula (b1) set forth in the description, a compound represented by the general formula (b2) set forth in the description, a compound represented by the general formula (b3) set forth in the description, and a salt of any of these compounds with an alkali metal, an alkaline earth metal, or an onium compound.

Abstract: Provided is a fluoroelastomer crosslinkable composition, containing a polyol-crosslinkable fluoroelastomer (a) and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the general formula (b) set forth in the description and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound.

Abstract: Provided is a method for producing a fluorine-containing polymer, comprising polymerizing a fluorine-containing monomer in the presence of a fluorine-free compound (1) represented by general formula (1), a polymerization initiator, and an aqueous medium to produce the fluorine-containing polymer: CX1X2?CX3—R—Z??General formula (1): wherein X1, X2, and X3 are each independently H or an alkyl group; R is a single bond or an alkylene group; the total number of carbon atoms of X1, X2, X3, and R is 0 to 5; Z is —SO3M, —OSO3M, —P(?O)(OM)2, —OP(O)(OM)2, or —B(OM)2; M is H, a metal atom, NR14, optionally substituted imidazolium, optionally substituted pyridinium, or optionally substituted phosphonium; and R1 is independently H or an organic group, and any two R1 may be bonded to each other to form a ring.

Abstract: A method for producing a fluorine-containing elastomer, which includes carrying out an emulsion polymerization of a fluorine-containing monomer in an aqueous medium in the presence of (A) a fluorine-containing compound containing a functional group capable of reaction by radical polymerization and a hydrophilic group and (B) a hydrocarbon surfactant to provide a fluorine-containing elastomer.

Abstract: A fluoroelastomer composition containing (a) a polyol-crosslinkable fluoroelastomer, (b) a cross-linking agent for polyol crosslinking, (c) a crosslinking accelerator; and (d) at least one acid acceptor selected from basic magnesium carbonate and magnesium phosphate, wherein the content of a divalent metal oxide is lower than 1 part by mass with respect to 100 parts by mass of the fluoroelastomer (a). Also disclosed is a molded article obtained by crosslinking the fluoroelastomer composition.

Abstract: The invention provides a fluoroelastomer composition capable of providing a molded article that is inexpensive and has excellent heat-aging resistance. The fluoroelastomer composition is a peroxide-crosslinkable fluoroelastomer composition containing a fluorine-containing elastomer that contains 25 to 90 mol % of a unit of vinylidene fluoride, 10 to 75 mol % of a unit of a fluorine-containing monomer other than the vinylidene fluoride, 0 to 10 mol % of a unit of a fluorine-free monomer copolymerizable with the vinylidene fluoride, and 0.1% by mass or less of an iodine atom and a bromine atom; an organic peroxide having a specific structure; and a co-crosslinking agent. The organic peroxide is present in an amount of 0.3 to 10 parts by mass relative to 100 parts by mass of the fluorine-containing elastomer.

Abstract: The present invention provides a hose excellent in mechanical properties at high temperatures. The hose of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E? of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz).

Abstract: The invention provides a fluoroelastomer composition capable of providing a molded article that is inexpensive and has excellent heat-aging resistance. The fluoroelastomer composition is a peroxide-crosslinkable fluoroelastomer composition containing a fluorine-containing elastomer that contains 25 to 90 mol % of a unit of vinylidene fluoride, 10 to 75 mol % of a unit of a fluorine-containing monomer other than the vinylidene fluoride, 0 to 10 mol % of a unit of a fluorine-free monomer copolymerizable with the vinylidene fluoride, and 0.1% by mass or less of an iodine atom and a bromine atom; an organic peroxide having a specific structure; and a co-crosslinking agent. The organic peroxide is present in an amount of 0.3 to 10 parts by mass relative to 100 parts by mass of the fluorine-containing elastomer.

Abstract: A fluororubber composition including a fluororubber, a silicone rubber, and perfluoropolyether. The fluororubber composition contains the silicone rubber in an amount of 5 to 55 parts by mass relative to 100 parts by mass of the fluororubber and the perfluoropolyether in an amount of 0.5 to 10 parts by mass relative to 100 parts by mass of the fluororubber.

Abstract: There is provided a crosslinkable fluorine-containing rubber composition being capable of giving a fluorine-containing rubber crosslinked and molded article having a low friction coefficient and assuring an increased proportion of a fluorine-containing resin around the surface of a fluorine-containing rubber, a molded article obtained by crosslinking the composition, and a method for producing the molded article. The crosslinkable fluorine-containing rubber composition comprises a fluorine-containing rubber (A) comprising vinylidene fluoride unit, a fluorine-containing resin (B) and a polyol crosslinking agent (C), wherein the fluorine-containing rubber (A) and the fluorine-containing resin (B) are kneaded at a temperature of not less than a temperature being lower by 5° C. than the melting point of the fluorine-containing resin (B).

Abstract: To provide a sealing material which is excellent in sealability under high-temperature conditions as well as crack resistance at high temperatures and high compression. A sealing material comprising a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B), the cross-linked fluororubber layer having a loss modulus E? of 600 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test under conditions of measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, and frequency: 10 Hz.

Abstract: The present invention provides a complex-shaped fluororubber formed product having excellent demoldability in molding. The complex-shaped fluororubber formed product of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E? of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz).

Abstract: The present invention provides a belt excellent in mechanical properties at high temperatures. The belt of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E? of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz).

Abstract: There is provided a fluorine-containing elastomer composition assuring easy kneading and providing a crosslinked article having improved strength. The fluorine-containing elastomer composition comprises (A) an elastomer of a vinylidene fluoride/hexafluoropropylene copolymer having a branching coefficient of 30 to 300 ppm, a Mooney viscosity (ML1+10: 121° C.) of 7 to 80 and a molecular weight distribution (Mw/Mn) of 1.5 to 4, and (B) an elastomer of a vinylidene fluoride/hexafluoropropylene copolymer having a storage modulus G? at 180° C. at 500 cpm of 500 to 900, and a mass ratio of (A)/(B) is 70/30 to 90/10.